阅读说明：本技术 一种鼻梁条制备方法 (Nose bridge strip preparation method ) 是由 李计彪 黄险波 叶南飚 付晓 肖孟杰 刘乐文 梁家荣 于 2020-11-30 设计创作，主要内容包括：本发明涉及鼻梁条技术领域,公开了一种鼻梁条制备方法,包括以下步骤：S1、物料通过挤出成型工艺生成熔体；S2、对熔体降温冷却,并对熔体进行第一次拉伸形成第一料条；S3、将第一料条加热至软化状态,并对软化状态的第一料条进行第二次拉伸形成第二料条；S4、对第二料条降温冷却后绕卷回收。本发明对由物料生成的熔体进行两次拉伸,第一次拉伸之前先将高温的熔体降温冷却成不处于完全冷却结晶状态的第一料条,随后将第一料条加热至软化状态,并对软化状态的第一料条进行第二次拉伸形成鼻梁条,第二次拉伸可进一步增大鼻梁条的拉伸形变量,同时确保鼻梁条不会发生断裂现象,有效提高成型后的鼻梁条的塑性变形能力和压紧效果。(The invention relates to the technical field of nose bridge strips, and discloses a nose bridge strip preparation method, which comprises the following steps: s1, generating a melt by the material through an extrusion molding process; s2, cooling the melt, and stretching the melt for the first time to form a first material strip; s3, heating the first material strips to a softening state, and stretching the first material strips in the softening state for the second time to form second material strips; and S4, cooling the second material strip, and winding and recovering the second material strip. The method comprises the steps of performing two times of stretching on a melt generated by materials, cooling the high-temperature melt into a first material strip which is not in a complete cooling crystallization state before the first stretching, heating the first material strip to a softening state, performing second stretching on the first material strip in the softening state to form the nose bridge strip, wherein the second stretching can further increase the stretching deformation amount of the nose bridge strip, simultaneously ensure that the nose bridge strip cannot be broken, and effectively improve the plastic deformation capacity and the compression effect of the formed nose bridge strip.)

1. A nose bridge strip preparation method is characterized by comprising the following steps:

s1, generating a melt by the material through an extrusion molding process;

s2, cooling the melt, and stretching the melt for the first time to form a first material strip;

s3, heating the first material strips to a softening state, and stretching the first material strips in the softening state for the second time to form second material strips;

and S4, cooling the second material strip, and winding and recovering the second material strip.

2. The method for preparing a nose bridge strip according to claim 1, wherein the step S3 of stretching the first strip in a softened state for the second time to form the second strip comprises the following specific steps:

the softened first material strip is sequentially wound on the first rotating wheel disc and the second rotating wheel disc, and a certain rotating speed difference exists between the first wheel disc and the second wheel disc, so that the first material strip in a softened state is stretched by the first rotating wheel disc and the second rotating wheel disc to form a second material strip.

3. The nose bridge strip manufacturing method according to claim 2, wherein a rotation speed ratio of the first wheel disc to the second wheel disc is (5-15): 1.

4. the method for manufacturing a nose bridge strip according to claim 2, wherein a first annular groove for fixing the first material strip is formed in the circumferential side wall of the first wheel, and a second annular groove for fixing the first material strip is formed in the circumferential side wall of the second wheel.

5. The method of manufacturing a nose bridge strip according to claim 1, wherein the temperature T1 of heating the first strip to a softened state in step S3 is 80 to 150 ℃.

6. The method of manufacturing a nose bridge strip according to claim 1, wherein the step S4 further comprises embossing a surface of the second strip before the second strip is wound and recycled.

7. The method for preparing a nose bridge strip according to claim 1, wherein the extrusion molding process in step S1 is to heat and extrude the material into a melt by using a single screw extruder, wherein the temperature T2 for heating the material by the single screw extruder is 180-300 ℃, and the rotation speed of the screw is 10-100 r/min.

8. The method of preparing a nose bridge strip according to claim 1, wherein the die used in the extrusion molding process in step S1 has a length dimension of 7 to 10mm, a width dimension of 3 to 5mm, and a thickness dimension of 1 to 5 mm.

9. The method for preparing a nose bridge strip according to claim 1, wherein the manner for cooling the melt in step S2 is as follows: and (3) passing the melt through a water tank filled with cold water, wherein the temperature T3 of the cold water is 15-35 ℃.

10. The method for preparing a nose bridge strip according to any one of claims 1 to 9, wherein the first strip has a width dimension of 4 to 5mm and a thickness dimension of 1 to 2mm, and the second strip has a width dimension of 3 to 4mm and a thickness dimension of 0.8 to 1 mm.

Technical Field

The invention relates to the technical field of nose bridge strips, in particular to a nose bridge strip preparation method.

Background

The nose bridge strip is used as a part of the mask and is used for fixing the mask on the nose bridge. At present, the main material for preparing the nose bridge strip is plastic metal or polyolefin resin, and the metal nose bridge strip and the mask are required to be separated and recycled when the waste mask is treated by the metal nose bridge strip, so that the process is troublesome, and the workload is large; meanwhile, the metal nose bridge strip has the defects of easy corrosion and poor antibacterial and bacteriostatic properties, so that the nose bridge strip made of polyolefin materials is more popular in the market. But the bridge of the nose strip of present polyolefin material has the problem that the plastic deformation effect is relatively poor, be difficult for compressing tightly, and the tensile deformation volume of needs control in-process that this problem mainly formed bridge of the nose strip shape by the polyolefin material is tensile to prevent fashioned bridge of the nose strip and break, nevertheless reduced the plasticity of bridge of the nose strip to a certain extent, thereby there is the phenomenon that bridge of the nose strip is difficult for compressing tightly the bridge of the nose.

Disclosure of Invention

The invention aims to provide a nose bridge strip preparation method, which optimizes the nose bridge strip preparation mode, effectively improves the plasticity of the nose bridge strip and further ensures that the nose bridge strip has better plastic deformation capability and compression effect.

In order to achieve the above object, the present invention provides a method for preparing a nose bridge strip, comprising the steps of:

s1, generating a melt by the material through an extrusion molding process;

s2, cooling the melt, and stretching the melt for the first time to form a first material strip;

s3, heating the first material strips to a softening state, and stretching the first material strips in the softening state for the second time to form second material strips;

and S4, cooling the second material strip, and winding and recovering the second material strip.

Further, the step S3 of performing the second stretching on the softened first strip to form the second strip specifically includes:

the softened first material strip is sequentially wound on the first rotating wheel disc and the second rotating wheel disc, and a certain rotating speed difference exists between the first wheel disc and the second wheel disc, so that the first material strip in a softened state is stretched by the first rotating wheel disc and the second rotating wheel disc to form a second material strip.

Further, the rotating speed ratio of the first wheel disc to the second wheel disc is (5-15): 1.

furthermore, a first annular groove used for fixing the first material strips is formed in the circumferential side wall of the first wheel disc, and a second annular groove used for fixing the first material strips is formed in the circumferential side wall of the second wheel disc.

Further, the temperature T1 at which the first strand is heated to a softened state in step S3 is 80 to 150 ℃.

Further, the step S4 includes embossing the surface of the second strip before the second strip is recovered from the roll.

Further, in the extrusion molding process in the step S1, the single screw extruder is used to heat and extrude the material to generate the melt, wherein the temperature T2 of the single screw extruder for heating the material is 180-300 ℃, and the rotation speed of the screw is 10-100 r/min.

Further, the length dimension of the neck ring mold used in the extrusion molding process in the step S1 is 7 to 10mm, the width dimension is 3 to 5mm, and the thickness dimension is 1 to 5 mm.

Further, the manner for cooling the melt in step S2 is as follows: and (3) passing the melt through a water tank filled with cold water, wherein the temperature T3 of the cold water is 15-35 ℃.

Further, the width dimension of the first material strips is 4-5 mm, the thickness dimension of the first material strips is 1-2 mm, and the width dimension of the second material strips is 3-4 mm, and the thickness dimension of the second material strips is 0.8-1 mm.

Compared with the prior art, the nose bridge strip preparation method provided by the embodiment of the invention has the beneficial effects that:

the method comprises the steps of performing stretching twice on a melt generated by materials, cooling the high-temperature melt into a first material strip which is not in a complete cooling crystallization state before the first stretching, wherein the size of the first material strip is larger than that of a nose bridge strip, heating the first material strip to a softening state, performing secondary stretching on the first material strip in the softening state to form the nose bridge strip, and performing secondary stretching to further increase the stretching deformation amount of the nose bridge strip, ensure that the nose bridge strip cannot be broken, effectively improve the plastic deformation capacity and the compaction effect of the formed nose bridge strip, and improve the use comfort of users.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interiors of two elements or through the mutual relationship of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, a first feature being "on," "over," and "above" a second feature includes the first feature being directly on and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

The invention discloses a preparation method of a nose bridge strip, which comprises the following steps:

s100, the materials are extruded and molded to form a melt.

The material is the material commonly used for producing polyolefin nose bridge, such as polyolefin material, or a mixture formed by adding other additives or auxiliary agents into the polyolefin material. The extrusion molding process is that an extruder is used for heating and melting solid materials into materials in a molten form, and the materials in the molten form pass through a die of the extruder to generate a melt for manufacturing the nose bridge strip.

Furthermore, in order to fully mix the melted solid materials, the extruder is preferably a single-screw extruder, the type of the single-screw extruder can be selected from 40-120J, the manufacturing cost and the maintenance cost of the single-screw extruder are low, and the solid materials can be fully melted. In order to ensure that the solid material is fully melted in the extruder, the temperature T2 for heating the material by the single-screw extruder is 180-300 ℃, and the rotating speed of the screw is 10-100 r/min. It should be noted that, a person skilled in the art can select the specific parameters of the extruder type, the temperature T2 and the screw rotation speed according to the production efficiency of the nose bridge strip and the quality of the finished product.

Meanwhile, in order to ensure that the melt can be smoothly stretched into the nose bridge strip, the length dimension of the mouth mold for the extrusion molding process is preferably 7-10 mm, the width dimension is preferably 3-5 mm, and the thickness dimension is preferably 1-5 mm.

S200, cooling the melt, and stretching the melt for the first time to form a first material strip.

Among them, the melt generated from the die is in a molten state due to high temperature, and when the melt is stretched, the melt needs to be cooled first. The cooling mode comprises water cooling, oil cooling, air cooling and cooling by adopting other cooling liquids, and the cooling mode of the melt is water cooling while considering the production cost and the cooling efficiency, the melt is passed through a water tank filled with cold water, and the length of the water tank is reasonably designed, so that the melt is stretched into a first bar after the high-temperature melt is fully cooled.

Further, the temperature T3 of the cold water in the basin is 15 ~ 35 ℃, and its purpose is through the temperature of control basin internal fuse-element to prevent the fuse-element because the cooling is low excessively and crystallization phenomenon appears, when guaranteeing that the fuse-element is stretching into first material strip, the bearing capacity is stronger, and then makes the bridge of the nose strip have better effect of compressing tightly.

Further, the melt is driven by a traction wheel to pass through a water tank, and a first material strip is formed under the stretching of a power roller. The first material strip formed by stretching is prevented from being broken by properly adjusting the tension and the rotating speed of the power roller. Simultaneously, the fuse-element passes through micrometer or slide caliper rule or the mould of customization in the in-process of pulling, and the width size of the first material strip after the design is stretched is 4 ~ 5mm, thickness dimension is 1 ~ 2mm to the size that makes the first material strip more is close the size of nose bridge strip.

S300, heating the first material strip to a softening state, and stretching the first material strip in the softening state for the second time to form a second material strip.

Due to the limited tensile capacity of the solid first strip, it is difficult to further increase the plastic deformation effect of the polyolefin nose bridge strip by increasing the amount of tensile deformation of the first strip. Therefore, the solid first material strip is heated to the softening state again, the stretching deformation amount of the first material strip in the softening state is far larger than that of the solid first material strip, the softened first material strip is stretched again to form the second material strip, the stretching deformation amount of the second material strip is improved, the plastic deformation effect of the polyolefin nose bridge strip is improved, and the compression effect is improved. Preferably, an oven is adopted to heat the first material strips, the working temperature of the oven is set to be 150-200 ℃, the heating temperature T1 of the first material strips in the oven is 80-150 ℃, so that the first material strips can be softened, the first material strips are not melted into a molten state, and the softened first material strips can be directly stretched for the second time.

Further, adopt first rim plate of pivoted and second rim plate to carry out the second time to the first strip after softening and stretch, concrete mode is: the first material strip after will softening twines in proper order at first rim plate and second rim plate, because there is certain rotational speed difference between first rim plate and the second rim plate, makes first material strip winding in the one end of first rim plate, twine in the other one end of second rim plate with first material strip and have the displacement poor for the both ends of first material strip are dragged each other, and then make first material strip stretch into the second material strip. In order to avoid the second material strip from being pulled apart or pulled into a filament shape in the process of forming the second material strip by stretching, the rotating speed ratio of the first wheel disc to the second wheel disc is (5-15): 1, the pulling force to first stuff strip both ends is controlled through the rotational speed difference of rationally adjusting first rim plate and second rim plate, ensures that first stuff strip stretches into the second stuff strip smoothly.

It should be noted that, the rotation of first rim plate and second rim plate is by motor direct drive, and first rim plate is adjacent with the second rim plate and is located same vertical plane simultaneously to make first stuff strip can twine smoothly on first rim plate and second rim plate in proper order.

The circumferential side wall of the first wheel disc is provided with a first annular groove for fixing the first material strip, and the circumferential side wall of the second wheel disc is provided with a second annular groove for fixing the first material strip. When the material winding device is used, the first material strip enters and winds along the first annular groove, then enters and winds along the second annular groove, and finally is sent out from the second annular groove. The first annular groove and the second annular groove are used for limiting the displacement of the first material strip in the second stretching process, and the second material strip is smoothly stretched.

Further, a micrometer or a caliper or a customized die is further arranged between the first wheel disc and the second wheel disc, and the first material strip penetrates through the micrometer or the caliper or the customized die to adjust the size of the formed second material strip during second stretching. According to the general size of the existing nose bridge strip, the width size of the second material strip is 3-4 mm, and the thickness size of the second material strip is 0.8-1 mm.

S400, cooling the second material strip, and then winding and recycling.

Similarly, the second material strip is cooled by adopting a water cooling mode, the second material strip sent out from the second wheel disc enters a constant-temperature water tank, the temperature of the constant-temperature water tank is set below 40 ℃, the second material strip is cooled and shaped and then is wound and recovered, and finally the nose bridge strip is formed. The winding recovery is performed by using a roller in the prior art, the structure and the principle of the winding recovery are known by those skilled in the art, and the description is omitted. Preferably, a tension bracket is further adopted in the winding recovery to control the tension force of the second material strip, so that the second material strip is prevented from being wasted due to abnormal shutdown in the production process, and the second material strip is prevented from being pulled apart by sudden external force.

Furthermore, in order to improve the aesthetic property of the nose bridge strip, embossing is carried out on the surface of the second material strip by an embossing machine before the second material strip is recycled, and the pattern is added on the nose bridge strip, so that the aesthetic property of the mask is improved.

In conclusion, the nose bridge strip material prepared by the nose bridge strip preparation method has the advantages that the appearance of the second material strip is good, the surface patterns of the second material strip are exquisite, filiform objects do not appear, the extrusion efficiency is high, the phenomenon of fracture is not easy to occur, the rebound angle of the prepared nose bridge strip after being folded is smaller than 15 degrees, and the prepared nose bridge strip has good plastic deformation and compression effects.

To sum up, the embodiment of the invention provides a nose bridge strip preparation method, which comprises the steps of stretching a melt generated by a material twice, cooling the high-temperature melt to form a first material strip which is not in a complete cooling crystallization state before stretching for the first time, wherein the size of the first material strip is larger than that of the nose bridge strip, heating the first material strip to a softening state, stretching the first material strip in the softening state for the second time to form the nose bridge strip, stretching deformation of the nose bridge strip for the second time can be further increased, the nose bridge strip is ensured not to be broken, the plastic deformation capacity and the compression effect of the formed nose bridge strip are effectively improved, and the use comfort of a user is improved.

Example 2

This example 2 is a specific embodiment of the method of making the nasal bridge strip of example 1 above.

This example 2 the parameters of the apparatus and product for preparing the nose bridge strip were controlled as follows:

(1) the machine type of the single-screw extruder is 40J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 10 r/min;

(2) the length dimension of the neck ring mold is 7mm, the width dimension is 4mm, and the thickness dimension is 1.5 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 180 ℃, and the heating temperature T1 of the first material strip in the oven is 140 ℃;

(5) the ratio of the rotational speed of the first disk to the rotational speed of the second disk is 7: 1;

(6) the width dimension of the first material strip is 4mm, and the thickness dimension of the first material strip is 1.5 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material produced by the preparation method has the advantages that the appearance of the second material strip is good, the surface patterns of the second material strip are exquisite, filiform objects do not appear, the extrusion efficiency is high, and the phenomenon of fracture does not occur easily, the rebound angle of the produced nose bridge strip is 12 degrees after the nose bridge strip is folded, the rebound angle is low, the plastic deformation and pressing effects are good, the free change of the plasticity is realized, the shaping effect is good, the rigidity and the toughness are balanced, the bending resistance is realized, and the nose bridge strip material is not fractured when being bent.

Example 3

This example 3 is another embodiment of the method of making a nasal bridge strip of example 1 above.

This example 3 the parameters of the apparatus and product for preparing the nose bridge strip were controlled as follows:

(1) the machine type of the single-screw extruder is 120J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 100 r/min;

(2) the length dimension of the neck ring mold is 10mm, the width dimension is 5mm, and the thickness dimension is 3 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 180 ℃, and the heating temperature T1 of the first material strip in the oven is 140 ℃;

(5) the rotation speed ratio of the first wheel disc to the second wheel disc is 10: 1;

(6) the width dimension of the first material strip is 5mm, and the thickness dimension of the first material strip is 3 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material produced by the preparation method has the advantages that the appearance of the second material strip is good, the surface patterns of the second material strip are exquisite, filiform objects do not appear, the extrusion efficiency is high, and the phenomenon of fracture does not occur easily, the resilience angle of the produced nose bridge strip is 11 degrees after the nose bridge strip is folded, the resilience angle is low, the plastic deformation and the pressing effect are good, the free change of the plasticity is realized, the shaping effect is good, the rigidity and the toughness are balanced, the bending is resistant, and the nose bridge strip material is not fractured when being bent.

Example 4

This example 4 is another embodiment of the method of making a nasal bridge strip of example 1 above.

Example 4 the parameters of the apparatus and product for preparing a nose bridge were controlled as follows:

(1) the machine type of the single-screw extruder is 80J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 80 r/min;

(2) the length dimension of the neck ring mold is 8mm, the width dimension is 4mm, and the thickness dimension is 4 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 190 ℃, and the heating temperature T1 of the interior of the oven to the first material strips is 150 ℃;

(5) the rotation speed ratio of the first wheel disc to the second wheel disc is 8: 1;

(6) the width dimension of the first material strip is 4mm, and the thickness dimension of the first material strip is 4 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material produced by the preparation method has the advantages that the appearance of the second material strip is good, the surface patterns of the second material strip are exquisite, filiform objects do not appear, the extrusion efficiency is high, and the phenomenon of fracture does not occur easily, the resilience angle of the produced nose bridge strip is 11 degrees after the nose bridge strip is folded, the resilience angle is low, the plastic deformation and the pressing effect are good, the free change of the plasticity is realized, the shaping effect is good, the rigidity and the toughness are balanced, the bending is resistant, and the nose bridge strip material is not fractured when being bent.

Example 5

This example 5 is another embodiment of the method of making a nasal bridge strip of example 1 above.

This example 5 the parameters of the apparatus and product for preparing the nose bridge strip were controlled as follows:

(1) the machine type of the single-screw extruder is 70J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 80 r/min;

(2) the length dimension of the neck ring mold is 8mm, the width dimension is 5mm, and the thickness dimension is 4 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 190 ℃, and the heating temperature T1 of the interior of the oven to the first material strips is 150 ℃;

(5) the rotation speed ratio of the first wheel disc to the second wheel disc is 8: 1;

(6) the width dimension of the first material strip is 5mm, and the thickness dimension of the first material strip is 4 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material produced by the preparation method has the advantages that the appearance of the second material strip is good, the surface patterns of the second material strip are exquisite, filiform objects do not appear, the extrusion efficiency is high, and the phenomenon of fracture does not easily occur, the rebound angle of the produced nose bridge strip is 10 degrees after the nose bridge strip is folded, the rebound angle is low, the plastic deformation and pressing effects are good, and the free change of plasticity, the shaping effect, the rigidity and toughness balance, the bending resistance and the fracture resistance during bending are realized.

Example 6

This embodiment 6 is similar to embodiment 2 described above, except that the rotational speed ratio of the first disk to the second disk is out of the range of embodiment 1 described above.

(1) The machine type of the single-screw extruder is 40J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 10 r/min;

(2) the length dimension of the neck ring mold is 7mm, the width dimension is 4mm, and the thickness dimension is 1.5 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 180 ℃, and the heating temperature T1 of the first material strip in the oven is 140 ℃;

(5) the ratio of the rotational speed of the first disk to the rotational speed of the second disk is 16: 1;

(6) the width dimension of the first material strip is 4mm, and the thickness dimension of the first material strip is 1.5 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material generated by the preparation method is easy to deform too much or even break in the process of secondary stretching due to the fact that the rotating speed ratio of the first wheel disc to the second wheel disc is too large, so that the production process often needs to be stopped for adjustment, and the production efficiency is reduced.

Example 7

This embodiment 7 is similar to embodiment 4 described above, except that the rotational speed ratio of the first disk to the second disk is out of the range of embodiment 1 described above.

Example 7 the parameters of the apparatus and product for preparing a nose bridge were controlled as follows:

(1) the machine type of the single-screw extruder is 80J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 80 r/min;

(2) the length dimension of the neck ring mold is 8mm, the width dimension is 4mm, and the thickness dimension is 4 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the oven is set to 190 ℃, and the heating temperature T1 of the interior of the oven to the first material strips is 150 ℃;

(5) the ratio of the rotational speed of the first disk to the rotational speed of the second disk is 4: 1;

(6) the width dimension of the first material strip is 4mm, and the thickness dimension of the first material strip is 4 mm; the width dimension of the second material strip is 3mm, and the thickness dimension is 0.9 mm.

And the second material strip after stretching and shaping is embossed and wound for recovery after passing through a constant-temperature water tank.

The nose bridge strip material generated by the preparation method has good strip appearance, but the rotating speed ratio of the first wheel disc to the second wheel disc is too low, so that the first strip is insufficient in tension when being stretched into the second strip, the rebound angle of the prepared nose bridge strip is close to 30 degrees after being folded, the plastic deformation effect is poor, and the compaction effect is poor.

Example 8

This example 8 is similar to example 5 above, except that this example 8 heats the first strand through two ovens.

This example 8 the parameters of the apparatus and product for preparing the nose bridge strip were controlled as follows:

(1) the machine type of the single-screw extruder is 70J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 80 r/min;

(2) the length dimension of the neck ring mold is 8mm, the width dimension is 5mm, and the thickness dimension is 4 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(4) the working temperature of the first oven is set to 190 ℃, and the heating temperature T1 of the first oven to the first material strips is 150 ℃;

(5) the working temperature of the second oven is set to be 120 ℃, and the heating temperature T1 of the second oven to the first material strips is 60 ℃;

(6) the width dimension of the first material strip is 5mm, and the thickness dimension is 4 mm.

The first strand of this example 8 was passed through a first oven and a second oven in sequence. It has been found through experimentation that it is difficult to uniformly stretch the first strip as it is stretched into the second strip. When the rotating speed ratio of the first wheel disc to the second wheel disc is increased, the first material strip is very easy to break in the process of stretching into the second material strip; when the rotational speed ratio that reduces first rim plate and second rim plate was compared and can evenly be drawn into the second material strip to first material strip, this first rim plate is compared in embodiment 1's within range with the rotational speed of second rim plate, leads to the nearly 30 of angle of kick-backing behind the bridge of the nose strip fifty percent discount that makes, and plastic deformation effect is relatively poor to lead to compressing tightly the effect not good enough.

Example 9

This example 9 is similar to example 1 above, except that the nose bridge strip of this example 9 is formed by first drawing after cooling the melt.

This example 9 the parameters of the apparatus and product for preparing the nose bridge were controlled as follows:

(1) the machine type of the single-screw extruder is 40J, the temperature T2 for heating the material by the single-screw extruder is 180-200 ℃, and the rotating speed of the screw is 10 r/min;

(2) the length dimension of the neck ring mold is 7mm, the width dimension is 3mm, and the thickness dimension is 0.9 mm;

(3) the temperature T3 of cold water in the water tank is 15-35 ℃;

(6) the width dimension of the first material strip is 3mm, and the thickness dimension is 0.9 mm.

And (4) embossing and winding for recycling the stretched and shaped first material strip after passing through a constant-temperature water tank.

The nose bridge strip material generated by the preparation method has the advantages that the appearance of the first strip is good, the surface pattern of the first strip is good, the extrusion efficiency is high, the rebound angle of the prepared nose bridge strip after being folded is nearly 40 degrees, the reason is that the stretching deformation quantity of the melt after cooling needs to be controlled, the first stretching tension of the melt is low, the plasticity of the first strip is small, the rebound angle is large, the plastic deformation effect is poor, and the compression effect is poor.

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, an express statement of the above term does 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.