阅读说明：本技术 一种塑料平板生产模具及塑料平板生产工艺 (Plastic flat plate production mold and plastic flat plate production process ) 是由 邓武俊 胡莉平 方林顺 邓昭明 李佶 于 2021-10-25 设计创作，主要内容包括：本发明涉及一种塑料平板生产模具及塑料平板生产工艺,模具包括第一模板、第二模板、环形边框及弹性夹具,环形边框的四周围合、上下方向贯通,环形边框的内周面具有凸出于该内周面的环形凸台,环形凸台具有上表面、下表面、连接面,环形边框、环形凸台采用弹性材质,环形边框上开设有注料通道；第一模板用于设在环形凸台的上表面,第二模板用于设在环形凸台的下表面,弹性夹具用于将第一模板、第二模板分别夹紧在环形凸台的上表面、下表面上,使第一模板、第二模板及环形凸台围合成封闭注料腔。本发明制备的塑料平板平面度稳定,且无毛边及颗粒；塑料平板表面硬度、机械性能、厚度一致同时内部及表面均无汽泡、无杂质及划伤。(The invention relates to a plastic flat plate production die and a plastic flat plate production process, wherein the die comprises a first die plate, a second die plate, an annular frame and an elastic clamp, the periphery of the annular frame is enclosed and is communicated in the vertical direction, an annular boss protruding out of the inner peripheral surface is arranged on the inner peripheral surface of the annular frame, the annular boss is provided with an upper surface, a lower surface and a connecting surface, the annular frame and the annular boss are made of elastic materials, and a material injection channel is arranged on the annular frame; the first template is used for being arranged on the upper surface of the annular boss, the second template is used for being arranged on the lower surface of the annular boss, and the elastic clamp is used for clamping the first template and the second template on the upper surface and the lower surface of the annular boss respectively, so that the first template, the second template and the annular boss are enclosed to form a closed material injection cavity. The plastic flat plate prepared by the invention has stable planeness and no rough edges and particles; the plastic flat plate has consistent surface hardness, mechanical property and thickness, and no bubbles, impurities and scratches on the inner part and the surface.)

1. The utility model provides a dull and stereotyped production mould of plastics which characterized in that: the die comprises a first die plate, a second die plate, an annular frame and an elastic clamp, wherein the periphery of the annular frame is enclosed and is communicated in the vertical direction, an annular boss protruding out of the inner peripheral surface is arranged on the inner peripheral surface of the annular frame, the annular boss is provided with an upper surface and a lower surface which are oppositely arranged, and a connecting surface for connecting the upper surface and the lower surface, a material injection channel is arranged on the annular frame, an opening at one end of the material injection channel is positioned on the outer peripheral surface of the annular frame, an opening at the other end of the material injection channel is positioned on the connecting surface of the annular boss, and the annular frame and the annular boss are made of elastic materials;

the first template is used for being arranged on the upper surface of the annular boss, the second template is used for being arranged on the lower surface of the annular boss, and the elastic clamp is used for clamping the first template and the second template on the upper surface and the lower surface of the annular boss respectively, so that the first template, the second template and the annular boss jointly enclose a closed material injection cavity.

2. The plastic flat panel production mold according to claim 1, characterized in that: the elastic clamping force applied to the annular boss by the elastic clamp is smaller than the resilience force of the annular boss.

3. The plastic flat panel production mold according to claim 2, characterized in that: the resilience force F of the annular boss is obtained by the following formula:

wherein, N is the pressure that the annular boss received, and A is the length on annular boss surface, and B is the width on annular boss surface.

4. A plastic flat panel production mold according to claim 2 or 3, characterized in that: the elastic clamp exerts elastic clamping force on the annular bossObtained by the following formula:

wherein the content of the first and second substances,is the tensile force of the elastic clamp and is,is the length of the surface of the annular boss,is the width of the surface of the annular boss,the number of the elastic clamps is the same as the number of the elastic clamps,is a constant.

5. The plastic flat panel production mold according to claim 1, characterized in that: the distance between the upper surface of the annular boss and the lower surface of the annular boss is 1.1-1.15 times of the thickness of the plastic flat plate to be produced.

6. The plastic flat panel production mold according to claim 1, characterized in that: the annular frame and the annular boss are made of plastics, and the plastics comprise PVC or EVA.

7. The plastic flat panel production mold according to claim 1, characterized in that: the elastic clamp comprises a first clamping portion, a second clamping portion and an elastic connecting portion, the elastic connecting portion is connected with the first clamping portion and the second clamping portion, the first clamping portion is provided with a first clamping surface, the second clamping portion is provided with a second clamping surface, in a use state, the first clamping surface abuts against the first template, and the second clamping surface abuts against the second template so as to clamp the first template and the second template on the upper surface and the lower surface of the annular boss respectively.

8. The plastic flat panel production mold according to claim 7, characterized in that: the second clamping part is annular, the upper surface of the annular second clamping part forms a second clamping surface, and when the elastic clamp is in a natural state, the first clamping part extends into the annular second clamping part and the first clamping surface of the first clamping part is positioned below the second clamping surface of the second clamping part.

9. A plastic flat plate production process is characterized in that: the production process adopts the plastic flat plate production mold as claimed in any one of claims 1 to 8, and comprises the following steps:

s1, preparing a castable;

s2, arranging the first template on the upper surface of the annular boss, arranging the second template on the lower surface of the annular boss, and clamping the first template and the second template on the upper surface and the lower surface of the annular boss respectively by using the elastic clamp, so that the first template, the second template and the annular boss jointly enclose a closed material injection cavity;

s3, pouring the casting material into the material pouring cavity, heating for a preset time, and removing the annular frame after cooling to room temperature;

s4, separating the molded plastic flat plate from the first template and the second template to obtain an independent plastic flat plate, wherein the thickness of the plastic flat plate is smaller than the distance between the upper surface and the lower surface of the annular boss in the step S2.

10. The plastic flat panel production process according to claim 9, characterized in that: the castable comprises allyl diglycol carbonate and an initiator, wherein the allyl diglycol carbonate accounts for 90-96% of the castable in percentage by mass.

Technical Field

The invention belongs to the field of plastic flat plate production, and particularly relates to a plastic flat plate production mold and a plastic flat plate production process.

Background

Plastic flat products are mainly exported abroad (mainly in the united states), and the plastic flat products are mainly used in cash dispensers. Before preparing a plastic flat plate product, a plastic flat plate is required to be manufactured, the plastic flat plate is square or round, the plastic flat plate is provided with an upper surface and a lower surface which are arranged oppositely, the upper surface and the lower surface are horizontal planes, the thickness of the plastic flat plate is uniform (the difference value between the thicknesses of the periphery and the middle part is small), the flatness of the plastic flat plate is required to be less than a certain range, and then the plastic flat plate is subjected to subsequent processing (screen printing, drilling and the like) to obtain the final required plastic flat plate product.

Because the plastic flat product needs to be adhered in the cash dispenser through the adhesive, the influence of silk-screen printing, drilling and the like on the flatness of the plastic flat product is not considered, and if the flatness is overlarge, the plastic flat product is easy to fall off due to tilting along with the time, so that the use is influenced; in addition, the plastic flat plate needs good mechanical property, and the prepared plastic flat plate product can be ensured to have good impact resistance and weather resistance (the plastic flat plate product needs to keep no deformation in outdoor severe weather).

The moulds used for the preparation of plastic flat plates at present are as follows: the specific structure is shown in fig. 14, and the device comprises two pieces of plane glass 7, a silica gel strip 8, a positioning block 9 and a clamp (such as a long-tail ticket clip, which is not shown in fig. 14), wherein the silica gel strip 8 is a cylindrical adhesive tape, the silica gel strip 8 is made of silica gel, and the silica gel strip 8 has a certain length and can be arranged in any shape; the positioning block 9 is made of hard plastic, which does not deform by squeezing. And (3) casting and processing: after a piece of plane glass 7 is placed on a workbench, a silica gel strip 8 is placed on the plane glass 7, the silica gel strip 8 is placed into a non-closed square ring shape (a notch, namely a pouring gate 10, is formed at one side), a positioning block 9 is respectively placed around the silica gel strip 8, then another piece of plane glass 7 is pressed on the silica gel strip 8, finally clamps are respectively placed around the silica gel strip 8 for clamping, after clamping, a pouring space is formed between the two pieces of plane glass 7 and the silica gel strip 8, the pouring material is injected into the pouring space through the pouring gate 10, a certain amount of pouring material is injected, the pouring gate 10 is sealed after air is exhausted, and finally, a plastic flat plate is obtained through heating and molding.

When the plastic flat plate is produced by using the mold, if a plastic flat plate with the thickness of 4mm is produced, the thickness of the positioning square block is 4mm, the diameter of the silica gel strip is 6mm, the silica gel strip is extruded by two pieces of plane glass and the clamp, the thickness of the positioning square block is unchanged, and the distance between the two pieces of plane glass is 4 mm. The problems of the above-mentioned mold are: the casting material shrinks in the forming process, the thickness of the positioning square block cannot be changed, and the silica gel strip has large elasticity and is soft, so that the produced plastic flat plate has uneven stress on each position, large internal stress exists in the plastic flat plate, and the thickness of the product is inconsistent. Especially when the plastic flat plate is stored for a period of time causing the flat plate to deform; and in the subsequent flat screen printing process, the plastic flat plate is heated to be more seriously deformed because the printing ink needs to be baked at high temperature.

At present, when the mold is used for producing plastic flat plates in batches, the shape of the silica gel strip is unstable, when an operator puts the silica gel strip into a square ring shape, the size of the square ring formed at each time is possibly different, the operator is different, the size of the square ring formed at each time is also different, a positioning square block needs to be placed after the silica gel strip is put into the square ring shape, the operation is complex, the production efficiency is low, and the product quality is poor.

Disclosure of Invention

The invention aims to provide a plastic flat plate production die and a plastic flat plate production process, which aim to solve the problems that the existing plastic flat plate is easy to deform and has uneven thickness.

In order to achieve the purpose, the invention adopts the technical scheme that:

a plastic flat plate production mold comprises a first mold plate, a second mold plate, an annular frame and an elastic clamp, wherein the periphery of the annular frame is enclosed and is communicated in the vertical direction, an annular boss protruding out of the inner peripheral surface is arranged on the inner peripheral surface of the annular frame, the annular boss is provided with an upper surface and a lower surface which are oppositely arranged, and a connecting surface connecting the upper surface and the lower surface, a material injection channel is arranged on the annular frame, an opening at one end of the material injection channel is positioned on the outer peripheral surface of the annular frame, an opening at the other end of the material injection channel is positioned on the connecting surface of the annular boss, and the annular frame and the annular boss are made of elastic materials;

the first template is used for being arranged on the upper surface of the annular boss, the second template is used for being arranged on the lower surface of the annular boss, and the elastic clamp is used for clamping the first template and the second template on the upper surface and the lower surface of the annular boss respectively, so that the first template, the second template and the annular boss jointly enclose a closed material injection cavity.

Preferably, the elastic clamping force applied to the annular boss by the elastic clamp is smaller than the resilience force of the annular boss.

Preferably, the resilience force F of the annular boss is obtained by the following formula:

wherein, N is the pressure that the annular boss received, and A is the length on annular boss surface, and B is the width on annular boss surface.

Preferably, said resilient clamp exerts a resilient clamping force on said annular bossObtained by the following formula:

wherein the content of the first and second substances,to be shotThe tension of the flexible clamp is controlled by the tension of the flexible clamp,is the length of the surface of the annular boss,is the width of the surface of the annular boss,the number of the elastic clamps is the same as the number of the elastic clamps,is a constant.

Preferably, the distance between the upper surface of the annular boss and the lower surface of the annular boss is 1.1-1.15 times of the thickness of the plastic flat plate to be produced.

Preferably, the annular frame and the annular boss are made of plastics, and the plastics comprise PVC or EVA. Further preferably, the annular frame and the annular boss are transparent.

Further preferably, the annular frame and the annular boss are integrally formed.

Preferably, the flatness of the first template and the second template is less than or equal to 0.05 mm.

Preferably, the first template and the second template are made of glass.

Preferably, the elastic clamp includes a first clamping portion, a second clamping portion and an elastic connecting portion, the elastic connecting portion is connected with the first clamping portion and the second clamping portion, the first clamping portion has a first clamping surface, the second clamping portion has a second clamping surface, in a use state, the first clamping surface abuts against the first template, and the second clamping surface abuts against the second template so as to clamp the first template and the second template on the upper surface and the lower surface of the annular boss respectively.

Preferably, the second clamping portion is annular, the upper surface of the annular second clamping portion forms the second clamping surface, and when the elastic clamp is in a natural state, the first clamping portion extends into the annular second clamping portion and the first clamping surface of the first clamping portion is located below the second clamping surface of the second clamping portion.

Preferably, the elastic clamp is integrally formed, and/or the elastic clamp is formed by bending a metal strip.

Another object of the present invention is to provide a process for producing a plastic flat panel.

In order to achieve the purpose, the invention adopts the technical scheme that:

a plastic flat plate production process comprises the following steps:

s1, preparing a castable;

s2, arranging the first template on the upper surface of the annular boss, arranging the second template on the lower surface of the annular boss, and clamping the first template and the second template on the upper surface and the lower surface of the annular boss respectively by using the elastic clamp, so that the first template, the second template and the annular boss jointly enclose a closed material injection cavity;

s3, pouring the casting material into the material pouring cavity through the material pouring channel, heating for a preset time, and removing the annular frame after cooling to room temperature;

s4, separating the molded plastic flat plate from the first template and the second template to obtain an independent plastic flat plate, wherein the thickness of the plastic flat plate is smaller than the distance between the upper surface and the lower surface of the annular boss in the step S2.

Preferably, the casting material comprises allyl diglycol carbonate and an initiator, wherein the allyl diglycol carbonate accounts for 90-96% of the casting material by mass, and the initiator accounts for 4-10% of the casting material by mass.

Preferably, in step S3, the annular frame is vertically placed to make the opening at one end of the injection channel face upward, then the casting material is injected into the injection cavity, the annular frame is shaken to discharge air bubbles and then the opening at one end of the injection channel is sealed, and the mixture is heated for a preset time.

Preferably, in step S3, the heating temperature is 30-90 ℃ and the heating time is 20-24 hours.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the plastic flat plate is prepared by the annular frame and the annular boss which have good resilience performance and can not generate burrs and surface particles in the pouring process, the elastic fixture with elastic clamping force, the first template and the second template, the annular boss synchronously shrinks along with the pouring material in the pouring material curing process, the force of the pouring material is uniform, the surface flatness of the prepared plastic flat plate is stable and is not easy to deform, the flatness of the plastic flat plate is not changed in a long time, and the burrs and the particles can not be generated; the surface hardness, mechanical property and flatness of the plastic flat plate reach the standard, the thickness is consistent, and no bubbles, impurities or scratches are generated on the inner part and the surface of the plastic flat plate; the plastic flat plate production process provided by the invention has the advantages that the operation steps are simplified, and the production time is greatly shortened.

Drawings

FIG. 1 is a schematic view of a first perspective of the present invention without a first template and a second template disposed on the annular frame;

FIG. 2 is a schematic view of a second perspective of the present invention without the first and second forms disposed on the annular frame;

FIG. 3 is a schematic structural view of a first template and a second template placed on an annular frame according to the present invention;

FIG. 4 is a schematic structural view of a first template of the present invention;

FIG. 5 is a schematic structural view of a second form of the invention;

FIG. 6 is a schematic view of the structure of the elastic clamp of the present invention;

FIG. 7 is a schematic view of the resilient clip of the present invention with the first clamping surface of the first clamping portion positioned above the second clamping portion;

FIG. 8 is a schematic view of a first perspective of the present invention with an elastic clamp positioned on the annular rim;

FIG. 9 is a schematic view of a second perspective of the present invention with an elastic clamp positioned on the annular rim;

FIG. 10 is a graph of the spring back force of an annular boss of an embodiment;

FIG. 11 is a top view of an annular boss of an embodiment;

FIG. 12 is a top view of a plastic planar plate of an embodiment;

FIG. 13 is a graph showing the heating profile in step S3 of the plastic flat panel production process;

FIG. 14 is a schematic structural view of a mold of a comparative example;

FIG. 15 is a plan view of a flat plastic plate of a comparative example.

In the above drawings:

1-annular frame, 2-annular boss, 21-connecting surface, 3-elastic clamp, 31-pressing part, 32-second clamping part, 33-first connecting strip, 34-second connecting strip, 35-elastic ring, 36-connecting part of first clamping part, 4-material injection channel, 5-first template, 6-second template, 7-plane glass, 8-silica gel strip, 9-positioning block and 10-pouring gate.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.

As shown in fig. 1 to 9, the plastic flat plate production mold includes a first mold plate 5, a second mold plate 6, an annular frame 1 and an elastic clamp 3.

The structure of the annular frame 1 is as follows: referring to fig. 1 and 2, the periphery of the annular frame 1 is enclosed and is through in the up-down direction, the inner peripheral surface of the annular frame 1 is provided with an annular boss 2 protruding out of the inner peripheral surface, the annular boss 2 surrounds a circle along the inner peripheral surface of the annular frame 1 to form a closed ring shape, the annular boss 2 is provided with an upper surface and a lower surface which are oppositely arranged, and a connecting surface 21 connecting the upper surface and the lower surface, the upper surface, the lower surface and the connecting surface 21 are all ring-shaped, and the upper surface and the lower surface are horizontal planes, i.e. the surfaces are flat; the connecting surface 21 is a smooth vertical surface.

The upper surface and the lower surface of the annular boss 2 do not exceed the upper end and the lower end of the annular frame 1 respectively, and the annular boss 2 can be positioned in the middle of the annular frame 1, so that the first template 5 and the second template 6 can be matched conveniently and can be conveniently molded.

If the sections of the annular frame 1 and the annular boss 2 are quadrilateral (such as square and rectangle), the upper surface, the lower surface and the connecting surface 21 of the annular boss 2 are rectangular, the produced plastic flat plate is quadrilateral, and four vertex angles of the connecting surface 21 of the annular boss 2 can be arc-shaped; or the section of the annular frame 1 is quadrilateral, the section of the annular boss 2 is circular, the upper surface, the lower surface and the connecting surface 21 of the annular boss 2 are circular, and the produced plastic flat plate is circular. The annular boss 2 is of a symmetrical structure, so that the plastic flat plate is not easy to have internal stress in the casting process, and the plastic flat plate is prevented from being deformed irregularly after being demoulded.

The annular frame 1 and the annular boss 2 are made of elastic materials, for example, the annular frame 1 and the annular boss 2 are made of plastics, and the plastics comprise PVC or EVA materials, so that the resilience performance is good; annular frame 1, annular boss 2 are transparent, can not have deckle edge and black granule, and impurity gets into the pouring material in avoiding pouring process annular frame 1, the annular boss 2, and the dull and stereotyped inside of plastics of avoiding the preparation has the foreign matter.

The distance between the upper surface and the lower surface of the annular boss 2 is 1.1-1.15 times of the thickness of the plastic flat plate to be produced, namely the distance between the upper surface and the lower surface of the annular boss 2 is equal to the thickness of the plastic flat plate to be produced plus 10% -15% of the thickness of the plastic flat plate to be produced, 10-12% is the optimal distance, and the annular frame 1 and the annular boss 2 shrink along with the shrinkage of the casting material in the molding process (the volume of the casting material generally shrinks by 10% -15%). If the distance between the upper surface and the lower surface of the annular boss 2 is the same as the thickness of the plastic flat plate to be produced, the thickness of the finally produced plastic flat plate is smaller. If a flat plastic plate with a thickness of 4mm is planned to be produced, the distance between the upper surface and the lower surface of the annular boss 2 is designed to be 4.4-4.6 mm.

Annular frame 1, annular boss 2 are through the integrated into one piece that moulds plastics, and the processing production of being convenient for, and reduce production step, labour saving and time saving when the follow-up pouring production plastics is dull and stereotyped.

The annular frame 1 is provided with the material injection channel 4, referring to fig. 1, 2 and 3, an opening at one end of the material injection channel 4 is positioned on the outer peripheral surface of the annular frame 1, an opening at the other end of the material injection channel 4 is positioned on the connecting surface 21 of the annular boss 2, and the material injection device and the material injection channel 4 can be communicated from the outside so as to facilitate material injection. Two material injecting channels 4 can be formed on the annular frame 1 to improve the material injecting speed. After the casting material enters the material injection cavity through the material injection channel 4 and the material injection cavity is sealed, air in the material injection cavity is discharged through the material injection channel 4, and bubbles are prevented from being generated in the formed plastic flat plate.

The first template 5 and the second template 6 have the following structures: referring to fig. 4 and 5, each of the first and second templates 5, 6 has an upper surface and a lower surface disposed opposite to each other, and the upper surface and the lower surface are disposed in parallel and are both horizontal surfaces. The flatness of the first template 5 and the second template 6 is less than or equal to 0.05mm, and the thickness tolerance is +/-0.05 mm. The first template 5 and the second template 6 can be made of glass, high-polishing toughened glass is the best, and the surface of the glass is free of any flaw and not easy to scratch. The thicknesses of the first template 5 and the second template 6 are 4-10mm, for example, 5mm and 6mm can be selected, so that good flatness of the prepared plastic flat plate can be ensured, and meanwhile, the production cost is low (the larger the thicknesses of the first template 5 and the second template 6 are, the higher the cost is).

In a use state, the first template 5 is arranged on the upper surface of the annular boss 2 (the edge of the first template 5 is abutted against the upper surface of the annular boss 2), the second template 6 is arranged on the lower surface of the annular boss 2 (the edge of the second template 6 is abutted against the lower surface of the annular boss 2), referring to fig. 3, the first template 5 and the second template 6 are respectively clamped on the upper surface and the lower surface of the annular boss 2 by using the elastic clamp 3, the first template 5, the second template 6 and the annular boss 2 jointly enclose a closed injection cavity, referring to fig. 8 and fig. 9, after clamping, the injection cavity is stable in structure due to the stable structure of the annular frame 1 and the annular boss 2, so that an operator can conveniently perform injection production, the problem of large plastic plate quality difference caused by different people can not exist when the same annular frame and annular boss are used in each operation, the operation is simple, and the production efficiency is high, the product quality is guaranteed.

Because of the shrinkage of the casting material during molding, in order to ensure that the thickness of the plastic flat plate finally produced is the required thickness, the elastic annular boss 2 is required to be synchronously shrunk along with the casting material during the molding process, and the annular boss 2 surrounds the casting material for a circle, so that the plastic flat plate is uniformly stressed during the molding process, and the plastic flat plate after being demoulded is uniform in thickness, good in flatness and not easy to deform.

At the same compression rate, the resilience force F of the annular boss 2 is obtained by the following formula:

wherein N is the pressure applied to the annular boss and has the unit of kgf; a is the length of the surface of the annular boss, and the unit is cm; and B is the width of the surface of the annular boss in cm. Unit kgf/cm of resilience²Indicating that the surface of the object is subjected to a pressure of 1kgf per square centimeter. The longitudinal direction means a direction indicated by an arrow in fig. 1, and the width direction means a direction perpendicular to the direction indicated by the arrow in fig. 1.

When the resilience force F of the annular boss 2 is tested, the annular boss 2 is cut off to be used as a test sample.

The method for testing the resilience force of the test sample of the annular boss 2 comprises the following steps: use electric power tensile testing machine (also known as tensile testing machine, universal tester, safety tool mechanical properties testing machine) to test, during the test, place annular boss 2 test sample on electric power tensile testing machine's test bench, compress this sample on the thickness direction, the first condition: the upper surface of the annular boss 2 faces upwards, and the annular boss 2 is vertically compressed towards the direction from the upper surface to the lower surface of the annular boss 2; in the second case: the connecting surface 21 of the annular boss 2 faces upwards, and the annular boss 2 is vertically compressed towards the connecting surface 21 of the annular boss 2. The rebound force graph is shown in figure 10.

In the first case: when a pressure is applied to the upper surface of the annular boss 2, A is the length of the upper surface of the annular boss 2, B is the width of the upper surface of the annular boss 2, if A is 1.2cm, B is 0.43cm, if the annular boss 2 is compressed by 0.1mm, N is 0.81kgf, the resilient force F is 1.57kgf/cm calculated by the above formula²(ii) a When the annular boss 2 is compressed by 0.3mm, N is 2.785kgf, and the spring back force F is 5.40kgf/cm²。

In the second case: when pressure is applied to the connecting surface 21 of the annular boss 2, A is the length of the connecting surface 21 of the annular boss 2, B is the width of the connecting surface 21 of the annular boss 2 (i.e. the thickness of the annular boss 2), A is 1.2cm, B is 0.46cm, if the annular boss 2 is compressed by 0.1mm, N is 0.91kgf, TongfuThe rebound force F is 1.65kgf/cm calculated by the above formula²(ii) a When the annular boss 2 is compressed by 0.3mm, N is 2.96kgf and the rebound force F is 5.36kgf/cm²。

For the annular boss 2 with the width of 0.43cm and the thickness of 0.46cm, when the annular boss 2 is compressed by 0.1-0.3mm under pressure, the resilience force of the annular boss 2 is 1.57-5.40kgf/cm²。

In order to ensure that the first template 5 and the second template 6 are respectively clamped on the upper surface and the lower surface of the annular boss 2, the first template 5, the second template 6 and the annular boss 2 jointly enclose a closed material injection cavity, and the clamping force is changed when the annular boss 2 contracts, the elastic clamp 3 is required, and the elastic clamping force applied to the annular boss 2 by the elastic clamp 3 is within a certain interval.

Referring to fig. 6, 7, 8 and 9, the elastic clamp 3 is constructed as follows: the clamping device comprises a first clamping part, a second clamping part 32 and an elastic connecting part, wherein the elastic connecting part is connected with the first clamping part and the second clamping part 32, the first clamping part is provided with a first clamping surface, the second clamping part 32 is provided with a second clamping surface, the first clamping surface is tightly abutted against the first template 5, and the second clamping surface is tightly abutted against the second template 6 in a use state, so that the first template 5 and the second template 6 are respectively clamped on the upper surface and the lower surface of the annular boss 2.

The second clamping part 32 is optimally annular, the upper surface of the annular second clamping part 32 forms a second clamping surface, when the elastic clamp 3 is in a natural state (an unused state), the first clamping part extends into the annular second clamping part 32, and the first clamping surface of the first clamping part is positioned below the second clamping surface of the second clamping part 32; in the clamped use state, see fig. 8, 9, the first clamping surface of the first clamping part is located above the second clamping surface of the second clamping part 32, enabling a larger clamping force to be provided.

The second clamping part 32 is in a closed ring shape, and the ring shape refers to a circular ring shape, a square ring shape or an elliptical ring shape; or a non-closed loop, such as a C-shape. The second clamping portion 32 may be formed by bending a metal strip to form a hollow ring shape.

The first clamping part has the following structure: the clamping device comprises a pressing part 31 and a connecting part 36, wherein the connecting part 36 inclines upwards and is connected with an elastic connecting part, the pressing part 31 is positioned at the lower part of the connecting part 36, and the bottommost surface of the pressing part 31 forms a first clamping surface. The connection portion 36 is inclined upward and the connection portion 36 forms an acute angle with the horizontal plane.

The abutting portion 31 is hook-shaped, the area of the first clamping surface of the first clamping portion is small, the abutting portion 31 of the first clamping portion is convenient to be close to the contact position of the first template 5 and the upper surface of the annular boss 2, namely close to the edge of the first template 5, the pouring material cavity can be sealed, pouring materials cannot be leaked, and when the edge is clamped, the whole clamping is stable.

Or the pressing part 31 is annular, the pressing part 31 and the annular second clamping part 32 are arranged oppositely, the pressing part 31 is in contact with the surface of the first template 5 in a large area, and the material injection cavity is stable. Depending on the plastic flat plate to be produced, the annular area of the pressing portion 31 may be smaller than, larger than, or equal to the annular area of the second clamping portion 32.

The specific structure of the elastic connecting part is as follows: the clamping device comprises a first connecting strip 33, a plurality of elastic rings 35 and a second connecting strip 34, wherein the elastic rings 35 are connected with the first connecting strip 33 and the second connecting strip 34, the first connecting strip 33 is connected with a connecting part 36 of a first clamping part, and the second connecting strip 34 is connected with a second clamping part 32. The plurality of elastic rings 35 can provide elastic force, the number of the elastic rings 35 is two or more, and the position of the plurality of elastic rings 35 in the middle of the whole clamp is optimal.

The first connecting strip 33, the plurality of elastic rings 35 and the second connecting strip 34 may be formed by bending one metal strip.

Second connecting strip 34 includes horizontal segment and vertical section, and the horizontal segment is connected with second clamping part 32, and the horizontal segment can be located same horizontal plane with second clamping part 32, and vertical section is connected with elastic ring 35, and when vertical section contradicted with 1 side of annular frame, elastic fixture 3 can not remove to 1 middle part direction of annular frame. The horizontal section and the vertical section are L-shaped, so that a space convenient for holding is formed, the elastic clamp 3 can be stably placed on a horizontal plane, the whole structure is stable, and the storage and the transportation are convenient.

Under the unused state, the included angle of the vertical section of the first connecting strip 33 and the vertical section of the second connecting strip 34 is larger than 90 degrees and smaller than or equal to 180 degrees, a space convenient for holding is formed among the connecting part 36, the elastic connecting part and the second clamping part 32 of the first clamping part, the first clamping part is convenient to prop open, the volume of the clamping space between the first clamping part and the second clamping part 32 is increased, the moving distance of the elastic clamp 3 along the first template 5 and the second template 6 is increased, namely, the clamping stroke is increased, so that the positions for clamping the first template 5 and the second template 6 are convenient to adjust.

Connecting portion 36 and the first connecting strip 33 of elastic connection portion of first clamping portion form the acute angle contained angle, are the arc between connecting portion 36 and the first connecting strip 33 of elastic connection portion of first clamping portion and be the optimum, and when the operator propped open first clamping portion through the hand pulling, the finger can come the application of force with the help of the arc structure, conveniently strutted and can not hurt the operator.

The elastic clamp 3 is integrally formed, and/or the elastic clamp 3 is formed by bending a metal strip, that is, the first clamping portion, the second clamping portion 32 and the elastic connecting portion are formed by bending a metal strip, that is, one end of the metal strip is bent into the pressing portion 31 of the first clamping portion, the other end of the metal strip is bent into the annular second clamping portion 32, and the middle of the metal strip is bent into the elastic connecting portion. The cross section of the metal strip is circular or oval.

After the metal strip is bent, the surface of the metal strip is subjected to smoothness treatment, so that the bottommost surface (a first clamping surface) of the pressing part 31 and a second clamping surface of the annular second clamping part 32 are both smooth structures, and the first template 5 and the second template 6 cannot be scratched.

The first template 5 and the second template 6 are respectively clamped on the upper surface and the lower surface of the annular boss 2 by using the elastic clamp 3, and the implementation process is as follows: pulling and expanding the first clamping part to make the pressing part 31 of the first clamping part far away from the second clamping part 32, sleeving the pressing part on the first template 5 and the second template 6, and making the annular second clamping part 32 move along the surface of the second template 6, when the proper position is reached and the first clamping part is released, the first clamping surface of the first clamping part and the second clamping surface of the second clamping part 32 respectively tightly press the first template 5 and the second template 6 to clamp the first template 5 and the second template 6 on the upper surface and the lower surface of the annular boss 2, if the clamping position is changed, the elastic clamp is moved by holding the elastic connecting part by hand, without using large force, when the clamping position is changed by using the binder with long tails, the binder needs large force to expand the binder and then move the binder, when in use, the binder is very hard to open the binder by operating the two long tails, the easily clamped first template 5, and the second template 6 are scratched, The second template 6 further influences the flatness of the poured plastic flat plate, the space stroke of the opened ticket holder is limited, and the space size capable of being clamped is small.

After pouring, when taking off elastic fixture 3, outwards stimulate elastic connection portion to 5 borders of first template, handheld second clamping part 32 again, the first clamping part of pulling can break away from elastic fixture 3 annular frame 1, need not great power and can take off elastic fixture 3.

When the elastic clamps 3 are provided in plurality, the elastic clamps 3 exert elastic clamping force on the annular boss 2Obtained by the following formula:

wherein the content of the first and second substances,is the tensile force of the elastic clamp, and the unit is kgf;the length of the surface of the annular boss is expressed in cm;the width of the surface of the annular boss is expressed in cm;the number of the elastic clamps is the same as the number of the elastic clamps,is a constant. Elastic clamping force unitIs kgf/cm²It means that the annular boss surface withstands a pressure of 1kgf per square centimeter. The longitudinal direction means a direction indicated by an arrow in fig. 1, and the width direction means a direction perpendicular to the direction indicated by the arrow in fig. 1.

The tensile force of the elastic clamp 3 is measured as follows: and (3) testing by using an electric power tensile testing machine, fixing the second clamping part 32 of the elastic clamp 3, and pulling the first clamping part to move upwards for a preset distance, wherein the preset distance is slightly larger than or equal to the sum of the thickness of the first template 5, the thickness of the annular boss 2 and the thickness of the second template 6.

When in useThe length of the groove is 20cm,the length of the groove is 0.43cm,is a mixture of a water-soluble polymer and a water-soluble polymer, and is 6,when the ratio is 4:

if the first clamping part is pulled to move upwards by 15mm, the tension force2.184kgf, the elastic clamping force of the 6 elastic clamps 3 pressed on the annular boss 2 was calculated to be 0.38kgf/cm according to the above formula²。

If the first clamping part is pulled to move upwards by 20mm, the tension forceAt 2.819kgf, the elastic clamping force of the 6 elastic clamps 3 pressing on the annular boss 2 was calculated to be 0.50kgf/cm according to the above formula²。

The elastic clamping force of 6 elastic clamps 3 pressed on the annular boss 2 with the length of 20cm, the width of 0.43cm and the thickness of 0.46cm is 0.38-0.50kgf/cm²。

The elastic clamping force applied to the annular boss 2 by the elastic clamp 3 is smaller than the resilience force of the annular boss 2, so that the pouring liquid in the pouring cavity in the pouring molding can be prevented from overflowing from the pouring channel 4. If the elastic clamping force of the elastic clamp 3 is too small, the material injection cavity cannot be completely closed, the casting material in the material injection cavity leaks out during casting, the finally prepared plastic flat plate is small in size, and the plastic flat plate has an empty part, so that the thickness of the plastic flat plate is uneven, the thickness consistency is poor, and the flatness is unstable. When the elastic clamping force of the elastic clamp 3 is too large and is larger than the resilience force of the annular boss 2, the annular boss 2 is flattened by the elastic clamp 3 in the casting process, the thickness of the finally prepared plastic flat plate is smaller, and the plastic flat plate is easy to deform.

The elastic clamp 3 can clamp the first template 5 and the second template 6 on the upper surface and the lower surface of the annular boss 2 respectively, and the elastic clamping force of the elastic clamp 3 is within a certain interval, and the clamping force is obtained based on the resilience force when the annular boss 2 is compressed by 0.1mm-0.3 mm. When the plastic flat plate is prepared by pouring, the annular boss 2 with good resilience, the elastic clamp 3 with elastic clamping force, the first template 5 and the second template 6 are combined, so that the flatness of the prepared plastic flat plate is less than or equal to 0.2mm, the plastic flat plate cannot deform during storage and post-processing printing heating, and the appearance is free of impurities. Mainly prepares a plastic flat plate with the length more than 0 and less than or equal to 300mm, the width more than 0 and less than or equal to 260mm and the thickness more than 0 and less than or equal to 5 mm.

A plastic flat plate production process adopts a plastic flat plate production mold to produce a plastic flat plate, and comprises the following steps:

s1, preparing a casting material, wherein the casting material comprises allyl diglycol carbonate and an initiator, the allyl diglycol carbonate accounts for 90-96% of the casting material by mass, and the allyl diglycol carbonate (Dially Glycol Carbonates) is CR-39 Monomer material manufactured by PPG company, also called C-acrylic acid, brand 8001577, produced by Barberton, Ohio. The initiator (curing agent) is a peroxydicarbonate free radical initiator and is a commercial Trigonox ADC-NS-60 (trademark), the initiator accounts for 4-10% of the mass percentage of the castable, the mass percentage of the initiator is optimally 4.86-5.22%, and two raw materials meeting a certain proportion are uniformly mixed at normal temperature to form the castable;

s2, arranging the first template 5 on the upper surface of the annular boss 2, arranging the second template 6 on the lower surface of the annular boss 2, and clamping the first template 5 and the second template 6 on the upper surface and the lower surface of the annular boss 2 respectively by using the elastic clamp 3, so that the first template 5, the second template 6 and the annular boss 2 jointly enclose a closed material injection cavity;

s3, pouring the casting material into the material injection cavity through the material injection channel 4, heating for a preset time, cooling to room temperature after heating, and obtaining an integrated plastic flat plate, a first template 5 and a second template 6, wherein in the casting process, the first template 5, the second template 6 and the casting material are integrated; after the pouring is finished, the pouring material is solidified to form a plastic flat plate, the plastic flat plate is adhered to the first template 5 and the second template 6, and the annular frame 1 is taken out through external force, so that the annular frame 1 is separated from the plastic flat plate, the first template 5 and the second template 6.

Before heating, the annular frame 1 is vertically placed, so that an opening of the material injection channel 4 on the outer peripheral surface of the annular frame 1 faces upwards (the plane of the annular frame 1 is vertical to the horizontal plane), then pouring materials are injected into the material injection cavity, the annular frame 1 is shaken to discharge air bubbles and then the opening at one end of the material injection channel 4 is sealed, then the special turnover frame is placed, and the special turnover frame is placed into a heating furnace to be heated, wherein the heating temperature is 30-90 ℃, and the heating time is 20-24 hours.

The specific heating process is as follows: firstly, the temperature is raised from room temperature to low temperature (35-41 ℃), the low temperature part leads the casting material to gradually start gelation, the temperature is slowly raised after the gelation starts (at the moment, the temperature is 75-78 ℃), and the casting material is completely solidified in the high temperature period; then the temperature is reduced to the mold opening temperature, for example, the temperature is taken out after the room temperature, and the heating curve is shown in the table 1 and the figure 13:

s4, separating the plastic flat plate from the first template 5 and the second template 6 by a separating device to obtain an independent plastic flat plate, wherein the thickness of the plastic flat plate is smaller than the distance between the upper surface and the lower surface of the annular boss 2 in the step S2, the separating device does not damage the plastic flat plate or the first template 5 and the second template 6, the separating device is an auxiliary mechanism commonly used by those skilled in the art, and the separating device belongs to common knowledge in the art and is not explained in detail herein.

And cleaning and drying the obtained plastic flat plate to obtain a final plastic flat plate, putting the plastic flat plate into a purified water cleaning tank during cleaning, taking out the plastic flat plate for drying after cleaning for a preset time, and packaging after the plastic flat plate is qualified.

Examples

In the adopted casting material, 95 percent of allyl diglycol carbonate and 5 percent of initiator Trigonox ADC-NS-60; the distance between the upper surface and the lower surface of the annular boss is the thickness H, and the unit is mm; a plastic flat plate having a length of 190mm, a width of 188mm and a thickness of 4mm was prepared.

5 groups of annular frames and annular bosses which are made of PVC (polyvinyl chloride resin) materials are adopted, the PVC materials are purchased from Dongxing chemical industry Limited liability company of the inner Mongolia Guyidong group, the model is SG-5, the execution standard is GB/T5761-2006, and the thicknesses of the 5 groups of annular bosses are shown in Table 2. In fig. 11, a1, a2, B1, B2, C1, C2, D1, and D2 are different test points on the annular boss, respectively. When the annular boss is compressed by 0.1-0.3mm, the resilience force is 1.57-5.40kgf/cm²Referring to the graph of the resilient force of the annular boss of FIG. 10, the elastic clamping force of the elastic clamp applied to the annular boss is 0.4-0.5kgf/cm²。

In table 2, the difference between the maximum value and the minimum value of the annular boss sample 1 is 0.13mm, the difference between the maximum value and the minimum value of the annular boss sample 2 is 0.23mm, the difference between the maximum value and the minimum value of the annular boss sample 3 is 0.15mm, the difference between the maximum value and the minimum value of the annular boss sample 4 is 0.10mm, the difference between the maximum value and the minimum value of the annular boss sample 5 is 0.10mm, and the differences between the maximum value and the minimum value of 5 annular bosses are smaller and the average value is close, which indicates that the thicknesses of 5 annular bosses are uniform.

5 groups of annular bosses are adopted to respectively produce 5 plastic flat plates, the thickness of the 5 plastic flat plates is measured and collected, and the thickness data is shown in a table 3; in fig. 12, a1, a2, B1, B2, C1, C2, D1, D2, and E (middle of panel) are different test points on the plastic panel, respectively; and flatness of the 5 plastic plates was measured by feeler gauge measurement, the flatness data being shown in table 4.

In table 3, the difference between the maximum value and the minimum value of the plastic flat plate prepared by using the annular boss sample 1 is 0.17mm, the difference between the maximum value and the minimum value of the plastic flat plate prepared by using the annular boss sample 2 is 0.24mm, the difference between the maximum value and the minimum value of the plastic flat plate prepared by using the annular boss sample 3 is 0.22mm, the difference between the maximum value and the minimum value of the plastic flat plate prepared by using the annular boss sample 4 is 0.21mm, the difference between the maximum value and the minimum value of the plastic flat plate prepared by using the annular boss sample 5 is 0.26mm, the differences between the maximum value and the minimum value of 5 plastic flat plates are smaller than 0.3mm and the average value is close to each other, the thicknesses of 5 plastic flat plates are uniform, and the average thicknesses of 5 plastic flat plates are within the range of 3.85-4.15 mm.

In table 4, the flatness of 5 plastic plates is less than 0.2mm, which meets the requirements, and no bubbles or impurities are generated inside and on the surface.

Density, surface pencil hardness, light transmittance and tensile tests were also performed on the 5 plastic slabs of this example, wherein the density of the plastic slabs was 1.30-1.31g/cm in thin-walled aluminum, the hardness was 2-3H, and the light transmittance was 92-95% VL. Among them, pencil hardness is also called coating hardness pencil measurement method, which is a test method and measurement system for calibrating coating hardness. Tensile test data referring to table 5, tensile tests were performed by an electric tensile tester.

The surface hardness and the mechanical property of the plastic flat plate can reach the standard according to the performance test. When the plastic flat plate of the embodiment is subjected to subsequent processing (screen printing, drilling and the like), the plastic flat plate cannot deform and break, and finally, the prepared plastic flat plate product has good impact resistance and weather resistance and meets the performance requirements.

Comparative example

This comparative example differs from the examples in that: the existing mold in the background technology is selected, the thickness of the positioning square block is 4mm, and the diameter of the silica gel strip is 6 mm.

5 groups of existing molds are selected, 5 plastic flat plates are respectively produced, the thickness of the 5 plastic flat plates is measured and collected, and the thickness data is shown in a table 6; in fig. 15, a1, a2, B1, B2, C1, C2, D1, D2, and E (middle of panel) are different test points on the plastic panel, respectively; and the flatness of the 5 plastic plates was measured by feeler gauge (feeler gauge) measurement, see table 7.

In table 6, the difference between the maximum value and the minimum value of the thicknesses of the 5 plastic flat plates of the present comparative example was large, and the thicknesses of the plastic flat plates were not uniform. In Table 7, the flatness of each of the 5 plastic plates was greater than 0.2 mm. After the plastic flat plate of the comparative example is subjected to subsequent processing (screen printing, drilling and the like), the plastic flat plate is deformed, and the material is arched after the plastic flat plate is stored for a long time, so that the plastic flat plate cannot be used for a long time.

The plastic flat plate product required to be used on the cash dispenser is obtained after the plastic flat plate is purchased from the UK before and the subsequent processing (silk-screen printing, drilling and the like on the plastic flat plate) is carried out, the delivery date of the whole product is 10 weeks, and the price is 4850 yuan/square; the plastic flat plate products needed to be used on the cash dispenser are obtained after the plastic flat plate is purchased from the United states and then is subjected to subsequent processing (screen printing, drilling and the like on the plastic flat plate), the delivery date of the whole product is 11 weeks, and the price is 8000 yuan/square.

The plastic flat plate prepared by the plastic flat plate production mold has short production period, and the required product is obtained after the subsequent processing (screen printing, drilling and the like on the plastic flat plate) is carried out on the plastic flat plate, the delivery date is only 2 weeks (the production time is greatly shortened), the price is only 800 yuan/square, the delivery date is greatly shortened, the cost is greatly reduced, and the self-sufficiency can be realized by utilizing the plastic flat plate production mold.

Tests show that the plastic flat plate prepared by the plastic flat plate production mold has stable surface flatness and no deformation, and the flatness is unchanged for a long time; the plastic flat plate has standard surface hardness, mechanical property and planeness, uniform thickness and no bubbles, impurities and scratches on the inner part and the surface.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.