阅读说明：本技术 新型滴塑工艺 (Novel plastic dripping process ) 是由 高延军 于 2021-07-31 设计创作，主要内容包括：本发明公开了新型滴塑工艺,涉及滴胶成型工艺技术领域,包括开模；胶体预处理；点胶,预处理的胶体滴入模穴内；覆片材,于模穴上覆盖片材,于片材上施压,使模穴内的胶体填充模穴并与片材充分接触；胶体固化,使模穴内的胶体固化；脱模；背面工艺处理,于片材的另一侧表面采用表面处理；外观成型。根据本发明的新型滴塑工艺,相对于传统的滴胶工艺,本发明通过在模穴内成型,胶体可自由塑形,不受外力干扰,良品率高。相对于注塑工艺形成的胶体,由于注塑模具受注塑口直径的限制,无法制造较薄的胶体,而本发明通过于模具表面设置模穴,模穴的深度和形状能够任意设置,通过点胶机注入定量的胶体便能成型,能够制造更薄的胶体。(The invention discloses a novel plastic dropping process, which relates to the technical field of a glue dropping forming process and comprises the steps of opening a die; pretreating colloid; dispensing, namely dripping the pretreated colloid into the mold cavity; covering a sheet material, covering the sheet material on the mold cavity, and applying pressure on the sheet material to enable the colloid in the mold cavity to fill the mold cavity and fully contact with the sheet material; solidifying the colloid to solidify the colloid in the mold cavity; demolding; performing back surface process treatment, namely performing surface treatment on the other side surface of the sheet; and (5) forming the appearance. Compared with the traditional glue dripping process, the novel glue dripping process has the advantages that the glue can be shaped freely by forming in the die cavity, the interference of external force is avoided, and the yield is high. Compared with the colloid formed by the injection molding process, the injection mold cannot manufacture thinner colloid due to the limitation of the diameter of an injection molding opening, and the invention can freely set the depth and the shape of the mold cavity by arranging the mold cavity on the surface of the mold, so that the colloid can be formed by injecting quantitative colloid through the dispenser and can manufacture thinner colloid.)

1. A novel plastic dripping process is characterized by comprising the following steps:

opening the mold, manufacturing a plurality of mold cavities (101) on the surface of the mold (100), wherein concave molds matched with the shapes of products are arranged in the mold cavities (101);

performing colloid pretreatment, namely vacuumizing and discharging bubbles from the raw materials, and feeding the raw materials into a dispensing machine;

dispensing, namely dripping the pretreated colloid into the mold cavity (101);

a covering sheet, wherein the mold cavity (101) is covered with a sheet (200), and pressure is applied to the sheet (200) to enable the colloid in the mold cavity (101) to fill the mold cavity (101) and fully contact with the sheet (200);

curing the colloid, namely curing the colloid in the mold cavity (101) in a thermal curing or UV curing mode according to the type of the colloid;

demolding, taking out the colloid formed by curing in the mold cavity (101), and adhering the cured colloid to the surface of one side of the sheet (200);

back surface processing, namely performing surface processing on the other side surface of the sheet (200);

and (5) forming appearance, and cutting the colloid from the sheet (200) along the contour of the colloid.

2. A new type of plastic drop moulding process according to claim 1, characterized in that the depth of the mould cavity (101) is not less than 0.1 mm.

3. The novel plastic dropping process according to claim 1, wherein in the step of colloid pretreatment, the raw material is selectively subjected to a preheating treatment according to the kind of the raw material.

4. The novel plastic dripping process according to claim 1, wherein in the step of dispensing, the inside of the mold cavity (101) is dispensed without filling air bubbles.

5. The novel plastic drop process according to claim 1, wherein the dropping amount of the colloid in each mold cavity (101) is 1.05 times of the mold capacity of the mold cavity (101).

6. The novel plastic drop molding process according to claim 1, wherein the mold cavities (101) are distributed on the surface of the mold (100) at equal intervals, and the glue in the two mold cavities (101) do not interfere with each other.

7. The novel plastic drop molding process according to claim 1, wherein the thickness of the sheet (200) is 0.1-3.0 mm.

8. The novel plastic drop molding process according to claim 1, wherein the sheet (200) can be any one of PC, PET, PMMA, PVC and composite board.

9. The novel plastic dripping process as claimed in claim 1, wherein in the back processing step, the surface treatment can be any one of film pasting, electroplating, silk printing, spraying, hot stamping, texture and transfer printing.

10. The novel plastic dripping process as claimed in claim 1, wherein in the step of forming the appearance, the glue on the sheet (200) is cut by any one of CNC forming, laser cutting and punch forming.

Technical Field

The invention relates to the technical field of a glue dripping forming process, in particular to a novel plastic dripping process.

Background

The drop molding technology is characterized in that a thermoplastic high polymer material has the characteristic of changeable state, namely, viscous flow property under a certain condition and the characteristic of restorable solid state at normal temperature, ink is jetted by using a proper method and a special tool, and the thermoplastic high polymer material is molded into a designed shape in the viscous flow state according to the requirement and then is solidified and molded at normal temperature.

The existing glue dripping forming process mainly depends on the surface tension of liquid, so that a glue body forms an arc-shaped liquid level on the surface of a workpiece, the arc-shaped liquid level is subjected to post-process treatment after curing forming, but the arc surface formed by the surface tension only can keep a single shape, the shape is not plastic, dust or dirt is easy to fall into the arc-shaped liquid level in the forming process, the arc-shaped liquid level is easy to deviate and is eccentric by external force, and the yield is low.

The designed shape can be formed by adopting a mold injection molding mode, but high mold cost is required, the minimum thickness of a product produced by adopting the mold injection molding mode cannot be lower than 0.7mm because the mold is limited by the diameter of the minimum injection molding opening, the post-treatment process needs 1:1 product area for lamination, the alignment difficulty is high, and the yield of the total process route production is only 20-50%. And in the later stage, UV hardening is needed to be sprayed, so that the surface of the product reaches the specified hardness, and the product is easy to wear and scratch.

Disclosure of Invention

The invention aims to at least solve the problems that the glue dripping in the prior art can not be freely shaped, is easily influenced by external force and has low yield; the injection molding mode adopted by the molding is limited by the diameter of an injection molding opening, the thinner thickness is difficult to achieve, the post-treatment paster has high alignment difficulty, and the hardening is difficult to achieve the specified hardness'. Therefore, the novel plastic dripping process provided by the invention has the advantages that the colloid can be freely shaped, the thickness is thinner, the post-treatment steps are fewer, the product reaches the same hardness index, all parameters are excellent, and the high yield is kept.

The novel plastic dripping process according to some embodiments of the invention comprises opening a mold, manufacturing a plurality of mold cavities on the surface of the mold, wherein the mold cavities are internally provided with female molds matched with the shapes of products; performing colloid pretreatment, namely vacuumizing and discharging bubbles from the raw materials, and feeding the raw materials into a dispensing machine; dispensing, namely dripping the pretreated colloid into the mold cavity; covering a sheet material on the mold cavity, and applying pressure on the sheet material to enable the colloid in the mold cavity to fill the mold cavity and be fully contacted with the sheet material; curing the colloid, namely curing the colloid in the mold cavity in a thermal curing or UV curing mode according to the type of the colloid; demoulding, taking out the colloid formed by curing in the mould cavity, and adhering the cured colloid to the surface of one side of the sheet; performing back surface process treatment, wherein surface treatment is adopted on the other side surface of the sheet; and (5) forming the appearance, namely cutting the colloid from the sheet along the contour of the colloid.

According to some embodiments of the invention, the depth of the cavity is not less than 0.1 mm.

According to some embodiments of the present invention, the raw material is selectively subjected to a preheating treatment according to the kind of the raw material in the colloid pretreatment step.

According to some embodiments of the present invention, in the dispensing step, the dispensing is performed without filling air bubbles into the mold cavity.

According to some embodiments of the invention, the dropping amount of the colloid in each mold cavity is 1.05 times of the capacity of the mold cavity.

According to some embodiments of the present invention, the mold cavities are distributed on the surface of the mold at equal intervals, and the gels in the two mold cavities do not interfere with each other.

According to some embodiments of the invention, the sheet has a thickness of 0.1 to 3.0 mm.

According to some embodiments of the present invention, the sheet may employ any one of PC, PET, PMMA, PVC and composite board.

According to some embodiments of the present invention, in the back surface processing step, the surface processing may be any one of film pasting, electroplating, silk-screen printing, spraying, hot stamping, texture and pad printing.

According to some embodiments of the invention, in the appearance forming step, the glue on the sheet is cut by any one of CNC forming, laser cutting and punch forming.

The novel plastic dropping process according to some embodiments of the invention has at least the following beneficial effects:

1. the mold cavity with the corresponding shape is manufactured on the mold according to the shape of a target product, the glue is dispensed in the mold cavity and then the sheet is coated, so that the glue can be freely shaped, the shape and the texture required by the glue are manufactured in the mold cavity in advance, the glue with the required shape is formed by demolding after the glue is dropped, and compared with the traditional glue dispensing process, the glue forming method has the advantages that the glue can be freely shaped by forming in the mold cavity, the glue is not interfered by external force, and the yield is high.

2. Compared with the colloid formed by an injection molding process, the colloid cannot be made thinner due to the limitation of the diameter of an injection molding opening of an injection mold.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic flow chart of a novel plastic dropping process according to an embodiment of the present invention;

FIG. 2 is a schematic view of a mold cavity covering sheet of the novel plastic dropping process according to the embodiment of the present invention;

fig. 3 is a schematic diagram of a second embodiment of the novel plastic dropping process according to the embodiment of the invention.

Reference numerals:

a mold 100, a mold cavity 101, and a sheet 200.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, top, bottom, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplicity of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

A novel drop molding process according to an embodiment of the present invention is described below with reference to fig. 1-3.

As shown in fig. 1-2, the novel plastic dropping process comprises the steps of mold opening, colloid pretreatment, glue dispensing, sheet covering, colloid curing, demolding, back surface process treatment, appearance forming and the like. Specifically, in the step of opening the mold, firstly, a plurality of mold cavities 101 are manufactured on the surface of the mold 100 according to the shape of a product to be produced, a concave mold matched with the shape of the product is arranged in each mold cavity 101, the shape of the product is processed in each mold cavity 101 by adopting a CNC (computer numerical control) processing method, and the concave mold corresponding to the shape of the product is formed, so that the precision of the mold cavity 101 manufactured by adopting the CNC processing can reach the micron level.

And (3) colloid pretreatment, namely, vacuumizing and bubble exhausting treatment is carried out on the raw materials, so that the influence of bubbles remained in the raw materials on the yield of the product is avoided. If there is the bubble to remain in the pectate, after the colloid solidifies, can form hollow bubble in the colloid after the product solidifies, lead to the product can't pass through quality inspection, become the defective products, lead to the yields to reduce. After the raw materials are pretreated to form colloid, the colloid is fed into a dispensing machine.

And dispensing, namely dripping the pretreated colloid into the mold cavity 101 from a dispenser, and keeping the cleanness degree in the mold cavity 101 in the dispensing process to avoid impurities such as dust, solid particles and the like from falling into the mold cavity 101, wherein the dripping needs to be carried out in a dustless environment.

Covering a sheet material, after the glue is dripped into the mold cavity 101 by the glue dripping machine, a mechanical arm or a worker covers the sheet material 200 on the mold cavity 101, applies pressure on the sheet material 200, the glue in the mold cavity 101 is filled into gaps in the mold cavity 101 through certain pressure, the sheet material 200 is in full contact with the glue, the sheet material 200 is pressed to the top of the mold cavity 101, namely the end face of the mold 100, the force applied by the sheet material 200 is uniform, and after the sheet material 200 is in full contact with the glue, the sheet material 200 is kept flush. If the force applied to the sheet material 200 is not uniform, the sheet material 200 may not be flat enough, resulting in uneven bottom of the finished product and not meeting the product requirements.

And curing the colloid, namely curing the colloid in the mold cavity 101 in a thermal curing or UV curing mode according to the type of the colloid after the sheet 200 is covered on the mold cavity 101, wherein the positions of the sheet 200 and the mold cavity 101 are required to be relatively fixed in the curing process, so that the phenomenon that the incompletely cured colloid and the sheet 200 are displaced to influence the yield of the product due to external impact is avoided.

And (3) demolding, removing the colloid formed by curing in the mold cavity 101 by a mechanical arm or a worker, and adhering the cured colloid to one side surface of the sheet 200.

And (3) performing back surface processing, namely performing surface processing on the other side surface of the sheet material 200, specifically, curing colloid on one side of the sheet material 200, and covering different textures or ground colors on the other side through the surface processing. In the existing glue dripping process, surface treatment is firstly carried out on the sheet material 200, then glue is dripped on the sheet material 200, and the dripped glue can only form a single shape on the sheet material 200 due to the surface tension, so that the shape of a product cannot be molded. The injection molding process comprises the steps of splicing the upper mold 100 and the lower mold 100 into a whole, injecting colloid into a mold cavity through an injection molding opening to form colloid with a fixed shape, cutting the surface-treated sheet 200 into a shape identical to the bottom of a product, and adhering the sheet 200 to the back of the colloid through a piece adhering device. The back that sheet 200 and colloid were guaranteed to match completely in the paster process, and the size that sheet 200 was cut and the accuracy of paster equipment can influence the yields of final product, if the size is cut to sheet 200 and colloid back size mismatch or the precision of paster equipment is not enough, all can make the yields reduce, and is extremely high to the equipment requirement.

The novel plastic dropping process combines a glue dropping process and an injection molding process, the structure of a product is manufactured in the mold cavity 101 in advance on the mold 100, then glue is dropped into the mold cavity 101 to form a fixed shape, the sheet 200 is covered above the mold cavity 101, and finally, the shape of the glue is cut from the sheet 200 along the contour of the glue through equipment. Compared with the existing glue dripping process and injection molding process, the novel injection molding process disclosed by the invention has the advantages that the matching degree of the sheet 200 and the glue is improved while the free molding of the glue is realized, the requirement on equipment is lower than that in the injection molding process, the yield is greatly improved, the production cost is reduced, the thinner glue capable of being freely molded can be manufactured by molding the mold cavity 101, the glue adopting the injection molding process is limited by the diameter of an injection molding opening, the thinner thickness is difficult to realize, the thickness of the glue produced by the common injection molding process is generally not less than 0.7mm, an injection molding machine is not required in the novel injection molding process disclosed by the invention, the thinner thickness is realized by the glue dripping in the mold cavity 101, the yield is ensured, the freely-molded thin glue can be manufactured, the product specification of a production line is expanded, and the production threshold is reduced.

It should be understood that the step of performing the back processing on the sheet 200 after the covering is performed is not the only embodiment, and in other embodiments, as shown in fig. 3, the step of performing the back processing on the sheet 200 before the covering may be performed according to the actual production requirement, so as to cover the mold cavity 101 with the sheet 200 after the back processing. The sequence of the steps of the cover sheet and the back surface processing is not described in detail, and it should be understood that the flexible conversion of the sequence of the steps of the cover sheet and the back surface processing without departing from the basic concept of the present invention is considered to be within the protection scope defined by the present invention.

In some embodiments of the present invention, specifically, the depth of the mold cavity 101 is not less than 0.1mm, that is, the minimum depth of the concave mold in the mold cavity 101 can reach 0.1mm, so as to realize the free molding of the colloid, and simultaneously, the thinnest thickness of the colloid is also 0.1mm, the injection molding process is adopted to manufacture the colloid with free molding, the thickness of the colloid is limited by the diameter of the injection molding opening of the injection molding equipment, the thickness of the colloid formed by conventional injection molding is not less than 0.7mm, and the colloid thickness of the present invention is to be achieved, the equipment cost is high, and the yield is low. By adopting the novel plastic dripping process, the production cost is reduced, the thickness of the colloid is thinner, the free shaping is considered, the characteristic of the free shaping of the injection molding process is combined, the production cost is reduced, and the production efficiency is greatly improved.

In some embodiments of the present invention, specifically, in the colloid pretreatment step, the raw material is selectively subjected to a preheating treatment according to the kind of the raw material, and the preheating treatment is adopted to increase thixotropy of the raw material and increase fluidity of the colloid.

In the dispensing step, it is necessary to ensure that the glue and the cavity 101 do not contain bubbles, so that the dispensing machine dispenses glue by adopting a bubble-free glue filling manner during glue dispensing construction. The construction without air bubbles can ensure that after the colloid is dripped into the mold cavity 101, the mold cavity 101 has no air interference between the colloids, and the colloid can be better filled in all corners in the mold cavity 101, so that the phenomenon that the product cannot meet the quality inspection standard due to the loss of local details after the colloid is molded is avoided.

In order to fully contact the sheet material 200 with the colloid in the mold cavity 101 in the step of coating the sheet material and avoid the dripping amount of the colloid, in the embodiment of the invention, the dripping amount of the colloid in each mold cavity 101 is 1.05 times of the mold capacity of the mold cavity 101, namely, when the colloid is dripped into the mold cavity 101, 0.05 times more colloid is dripped, so that the sheet material 200 can fully contact with the colloid, and simultaneously, the waste caused by the excessive dripping amount is avoided. The mold cavities 101 are distributed on the surface of the mold 100 at equal intervals, and a certain distance is reserved between the mold cavities 101, so that the glue between the mold cavities 101 is not interfered with each other, that is, in the step of coating the sheet material, the sheet material 200 is pressed on the surface of the mold cavity 101, the redundant glue is extruded out to the periphery from the mold cavity 101, if the distance between the mold cavities 101 is too small, the glue in the adjacent mold cavity 101 can permeate into the other mold cavity 101, so that the mutual interference of the glue in the adjacent mold cavity 101 is caused, and the yield of the product is influenced. The specific distance between the mold cavities 101, which is not described in detail in the embodiments of the present invention, is adjusted according to the actual production situation, so that the colloids do not interfere with each other after the sheets are coated on the mold cavities 101.

In some embodiments of the present invention, specifically, in the step of covering the sheet material, the thickness of the sheet material 200 may be between 0.1mm and 3.0mm, the material of the sheet material 200 may be any one of PC, PET, PMMA, PVC and a composite board, and the thickness of the sheet material 200 and the material are matched arbitrarily. It is understood that the combination of the thickness and the material of the sheet 200 can be flexibly changed without departing from the basic concept of the present invention, and the combination is considered to be within the protection scope defined by the present invention.

In the back surface processing step, the surface of the sheet 200 may be processed by any one of film pasting, electroplating, silk printing, spraying, hot stamping, texture printing and pad printing, and a suitable processing technology is selected according to the production requirements of actual products. In the last re-forming step, the colloid solidified on the sheet material 200 is cut off by any one of the forming modes of CAC forming, laser cutting and punch forming, so as to obtain a finished product.

The novel plastic dripping process has the advantages of a glue dripping forming process and an injection molding process, overcomes the defects of the two processes, improves the yield of products and reduces the production cost of complex products. The colloid of the glue dripping process can only keep a single shape under the influence of surface tension, dust or dirt is easy to fall on the surface of the colloid in the forming process, and the colloid is easy to deviate and be eccentric due to fluidity when being subjected to external force, so that the yield is reduced.

Although the injection molding process can realize free molding by designing the mold 100, the manufacturing cost of the mold 100 is high, the moving cost is tens of thousands of yuan, the mold 100 is limited by the diameter of an injection molding opening, the thinnest thickness of a product produced by the injection molding mode of the mold 100 cannot be lower than 0.7mm, in the post-processing process, the sheet 200 needs to be attached to the surface of the product in a ratio of 1:1, the alignment difficulty is high, the cutting precision of the sheet 200 is high, the yield is low than five, the surface of a product needs to be hardened by spraying UV in the later period, the surface of the product reaches specified hardness, the sprayed UV layer is thin, and the surface of the colloid is still easy to wear and scratch. The novel plastic dripping process has the advantages that the mold cavity 101 is arranged on the surface of the mold 100, the cost is low and is less than ten thousand yuan, the process is not limited by the diameter of an injection molding opening, the colloid can be 0.1mm thick, post-treatment materials can be added into the colloid in the colloid pretreatment step, after the colloid is hardened, the surface of the colloid is wear-resistant, the whole colloid contains wear-resistant components, and the specification of the colloid is superior to that of a finished product produced by the injection molding process.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.