CN110396234A - Preparation method of touch pen point - Google Patents

Abstract

The invention relates to the field of stylus, and discloses a method for preparing a stylus tip. The method includes the following steps: firstly put various raw materials into a vacuum drying box for drying treatment, and the various raw materials include powdery high Density polyethylene, powdered low-density polyethylene, lubricant, carbon black, light calcium carbonate; various raw materials that have been dried are added to the mixer according to a certain weight percentage and mixed, and various raw materials are repeatedly mixed and stirred to form The mixture to be sintered; insert the structural core rod in the center of the mold cavity, then fill the mixed material into the mold cavity, and coat the outer surface of the structural core rod; then fill it into the mold cavity through the pressure head pair The mixture inside is initially pressurized, and then placed in a sintering furnace for sintering; after sintering is completed, it is naturally cooled to room temperature, and finally removed from the mold. The stylus tip prepared by the method has high touch accuracy, rich expansion functions, excellent writing experience, high structural strength, and is convenient for production, processing and replacement.

Description

Preparation method of stylus tip

technical field

The invention relates to the field of touch pens, in particular to a method for preparing a touch pen tip.

Background technique

With the popularization of touch screens in people's life and work, the application scenarios of stylus are also increasing, and human-computer interaction through stylus has become a popular interaction method. Currently, the popular stylus tips on the market are generally made of three types of materials: rubber, plastic, and fiber felt. In terms of writing experience, rubber stylus tips are relatively soft, and there is not much noise when writing, but usually due to large damping, writing is difficult. It is not smooth enough, and it is easy to get tired after long-term use; the hardness of plastic materials is high, and the writing is smooth, but it is often accompanied by a large screen impact sound, which may even cause damage to the screen after long-term use; fiber felt pen tip materials can be used to a certain extent Balance the impact sound and smoothness of the screen, but there is a certain probability of sharp abnormal noise, and the user experience is poor.

Therefore, it is of great significance to develop a stylus tip with high touch precision, rich expansion functions, excellent writing experience, high structural strength, easy production and replaceable.

Contents of the invention

The purpose of the present invention is to provide a method for preparing a stylus tip. The stylus tip prepared by this method has high touch accuracy, rich expansion functions, excellent writing experience, high structural strength, and is easy to produce and process and easy to replace.

Its technical scheme is as follows:

The preparation method of stylus tip, comprises the following steps:

First put various raw materials into a vacuum drying oven for drying treatment, and the various raw materials include powdered high-density polyethylene, powdered low-density polyethylene, lubricant, carbon black, and light calcium carbonate;

The dried various raw materials are added to the mixer according to a certain weight percentage for mixing and stirring, and the various raw materials are repeatedly mixed and stirred to form a mixture to be sintered;

Insert the structural core rod in the center of the mold cavity, then fill the mixed material into the mold cavity, and coat the outer surface of the structural core rod;

Then preliminarily pressurize the mixture filled into the mold cavity through the pressure head, and then put it into the sintering furnace for sintering;

After the sintering is completed, it is naturally cooled to room temperature, and finally removed from the mold.

The drying temperature for many of the raw materials is from 75°C to 85°C.

Preferably, the drying temperature of the various raw materials is 80°C.

The drying time for many of these materials ranged from 1.8 hours to 2.5 hours.

Preferably, the drying time of the various raw materials is 2 hours.

The mixer is a high-speed mixer, and the speed of the high-speed mixer is 2000r/min to 8000r/min.

Preferably, the speed of the high-speed mixer is 4500r/min.

The mixing and stirring time of various raw materials is 15 seconds to 30 seconds each time.

Preferably, the time for each mixing and stirring of the various raw materials is 25 seconds.

The number of stirring times for repeated mixing of multiple raw materials is 3 to 6 times.

Preferably, the number of times of repeated mixing of multiple raw materials is 4 times.

The heating rate of the sintering furnace is 1°C/min to 5°C/min.

Preferably, the heating rate of the sintering furnace is 3° C./min.

When the temperature of the sintering furnace is raised to 120° C. to 200° C., the temperature is kept for 60 minutes to 100 minutes.

Preferably, when the temperature of the sintering furnace is raised to 180° C., it is kept for 80 minutes.

The structural core rod is made of metal material or carbon fiber material.

Preferably, the metal is iron or stainless steel.

The shape of the structural core rod is a cylinder, a cuboid or a prismatic column.

The structural core rod includes a main body section and an articulation section, the main body section and the articulation section are integrally formed and connected, and the outer surface of the articulation section is provided with seams, indentations or etching grooves; the mixture package It is covered on the outer surface of the structural core rod and integrally formed by winding it.

The compound is coated on the outer surface of the occlusal segment and integrally formed by winding it.

Advantages or principles of the present invention are described below:

1. A variety of raw materials for preparing the stylus tip include powdered high-density polyethylene, powdered low-density polyethylene, lubricant, carbon black, light calcium carbonate, powdered high-density polyethylene as the main material of the pen tip, powdered High-density polyethylene is a thermoplastic engineering plastic with excellent comprehensive properties. Its density is small, and it has good wear resistance, self-lubrication, impact resistance, corrosion resistance, etc.;

Adding a certain proportion of powdered low-density polyethylene can adjust the overall hardness of the nib and the internal pore structure of the nib. At the same time, the powdered low-density polyethylene can also reduce the weight of the nib to a certain extent, thereby reducing the impact of the screen when writing. Writing experience; powdered low-density polyethylene with low melt index is selected, which has high viscosity and can increase the bonding force with the structural core rod;

Carbon black has two functions, one is as a pigment, stable performance, heat resistance, chemical resistance, light resistance, low cost, strong tinting strength; the other is to enhance the conductivity, when the pen tip is used as a multi-functional When using a capacitive pen, the conductivity of the tip material needs to meet certain requirements;

Adding a small amount of light calcium carbonate can further reduce the weight of the nib and improve the wear resistance of the nib;

The stylus tip is processed by sintering molding, the process control is relatively simple, and the quality of the finished product is stable. At the same time, the stylus tip made by sintering has uneven surface appearance and a certain roughness, and the roughness can be adjusted by Sintering temperature and pressure adjustment; appropriate surface friction coefficient can make the nib not too damp when writing, and at the same time can get the friction feeling of real writing;

The addition of the structural core rod can greatly increase the structural strength of the stylus pen tip. In the event of a drop, it can ensure the stability of the pen tip structure and electronic functions to a certain extent, reduce the amount of deformation, and ensure high precision and high sensitivity; through The structural core rod is added to increase the integrity of the stylus tip, and it is easy to replace the stylus tip, avoiding the problem that the slender pen tip is easy to break during replacement; the structural core material is added to facilitate demoulding after sintering. Due to the high friction between the nib and the mold cavity during demoulding, workers need to manually demould, which increases the processing cycle and labor costs. After adding the structural core material, it can be ejected through the punch on the press when demoulding, which is convenient for production and processing.

2. The drying temperature of each raw material is 75°C to 85°C, preferably, the drying temperature of each raw material is 80°C, which not only ensures the drying environment of the raw materials, but also does not affect the performance of various raw materials.

3. The drying time of each raw material is 1.8 hours to 2.5 hours, preferably, the drying time of each raw material is 2 hours, so that each raw material is fully dried.

4. The mixing machine is a high-speed mixing machine, and the rotating speed of the high-speed mixing machine is 2000r/min to 8000r/min. Preferably, the rotating speed of the high-speed mixing machine is 4500r/min, which saves mixing time and makes the mixing more uniform.

5. The mixing and stirring time of various raw materials is 15 seconds to 30 seconds each time, preferably, the mixing and stirring time of various raw materials is 25 seconds each time, so that the various raw materials are fully mixed.

6. The number of times of repeated mixing of various raw materials is 3 to 6 times, preferably, the number of times of repeated mixing of various raw materials is 4 times, so as to ensure more complete mixing of various raw materials.

7. The heating rate of the sintering furnace is 1°C/min to 5°C/min. Preferably, the heating rate of the sintering furnace is 3°C/min, and the heating temperature of the sintering furnace is 3 degrees per minute. Slowly raise the temperature to avoid excessive heating , to maintain a uniform temperature inside the material and a stable change in material properties.

8. Slowly raise the temperature of the sintering furnace to 120°C to 200°C and keep it warm for 60 minutes to 100 minutes, choose to sinter in the temperature range of 120°C to 200°C for 60 minutes to 100 minutes, which can ensure that the mixture is in a molten state and can make the polymer The molecular structure and molecular aggregation form of ethylene change to avoid oxidation and degradation, so that the sintered material has better physical properties and can better control the internal microporous structure of the material. According to the experimental measurement, the sintering furnace is slowly heated up to Sintering at 180°C for 80 minutes, the physical properties of the sintered material are more excellent.

9. The structural core rod is made of metal material or carbon fiber material. Preferably, the metal is iron or stainless steel, but not limited to iron, stainless steel or carbon fiber material, as long as it has a certain strength and is not easy to bend.

10. The shape of the structural core rod is a cylinder, a cuboid or a prism, but not limited to a cylinder, a cuboid or a prism.

11. The structural mandrel includes a main body section and an occlusal section. The outer surface of the occlusal section is provided with seams, indentations or grooves to increase the binding force between the structural mandrel and the mixture.

Description of drawings

FIG. 1 is a cross-sectional view of a stylus tip according to a first embodiment of the present invention.

FIG. 2 is a second cross-sectional view of the stylus tip according to the second embodiment of the present invention.

Explanation of reference signs:

10. Mixed material, 20. Structural core rod, 21. Main body section, 22. Occlusion section.

Detailed ways

Embodiments of the present invention will be described in detail below.

The preparation method of the stylus tip as shown in Fig. 1 comprises the following steps:

First put various raw materials into the vacuum drying oven for drying treatment, and various raw materials include powdered high-density polyethylene, powdered low-density polyethylene, lubricant, carbon black, and light calcium carbonate;

The dried various raw materials are added to the mixer according to a certain weight percentage for mixing and stirring, and the various raw materials are repeatedly mixed and stirred to form a mixture 10 to be sintered;

Insert a structural core rod 20 in the center of the mold cavity, then fill the mixed material 10 into the mold cavity, and coat the outer surface of the structural core rod 20;

Then, the mixture 10 loaded into the mold cavity is preliminarily pressurized by the pressure head, and then put into the sintering furnace for sintering;

After the sintering is completed, it is naturally cooled to room temperature, and finally removed from the mold.

Wherein, the drying temperature of various raw materials is 75°C to 85°C; preferably, the drying temperature of various raw materials is 80°C;

The drying time of various raw materials is 1.8 hours to 2.5 hours; preferably, the drying time of various raw materials is 2 hours;

The mixer is a high-speed mixer, and the speed of the high-speed mixer is 2000r/min to 8000r/min; preferably, the speed of the high-speed mixer is 4500r/min.

The mixing and stirring time of multiple raw materials is 15 seconds to 30 seconds; preferably, the mixing and stirring time of multiple raw materials is 25 seconds;

The number of times of repeated mixing of multiple raw materials is 3 to 6 times; preferably, the number of times of repeated mixing of multiple raw materials is 4 times;

The heating rate of the sintering furnace is 1°C/min to 5°C/min; preferably, the heating rate of the sintering furnace is 3°C/min;

When the temperature of the sintering furnace is raised to 120°C to 200°C, it is kept for 60 minutes to 100 minutes; preferably, when the temperature of the sintering furnace is raised to 180°C, it is kept for 80 minutes;

The structural core rod 20 is made of metal material or carbon fiber material; preferably, the metal is iron or stainless steel; but not limited to iron, stainless steel or carbon fiber material; the shape of the structural core rod 20 is a cylinder, a cuboid or a prismatic column; but not Limited to cylinders, cuboids, or prisms.

In the first embodiment, as shown in Figure 1, the structural core rod 20 includes a main body section 21 and an engaging section 22, the main body section 21 and the engaging section 22 are integrally formed and connected, and the outer surface of the engaging section 22 is provided with seams, indentations or Grooves are etched; the compound material 10 is coated on the outer surface of the structural core rod 20 and wound together with it.

In the second embodiment, as shown in FIG. 2 , the compound 10 is coated on the outer surface of the occlusal section 22 and integrally formed with it.

This embodiment has the following advantages:

1. A variety of raw materials for preparing the stylus tip include powdered high-density polyethylene, powdered low-density polyethylene, lubricant, carbon black, light calcium carbonate, powdered high-density polyethylene as the main material of the pen tip, powdered High-density polyethylene is a thermoplastic engineering plastic with excellent comprehensive properties. Its density is small, and it has good wear resistance, self-lubrication, impact resistance, corrosion resistance, etc.;

Adding a certain proportion of powdered low-density polyethylene can adjust the overall hardness of the nib and the internal pore structure of the nib. At the same time, the powdered low-density polyethylene can also reduce the weight of the nib to a certain extent, thereby reducing the impact of the screen when writing. Writing experience; use powdery low-density polyethylene with a low melt index, which has a high viscosity and can increase the bonding force with the structural core rod 20;

Carbon black has two functions, one is as a pigment, stable performance, heat resistance, chemical resistance, light resistance, low cost, strong tinting strength; the other is to enhance the conductivity, when the pen tip is used as a multi-functional When using a capacitive pen, the conductivity of the tip material needs to meet certain requirements;

Adding a small amount of light calcium carbonate can further reduce the weight of the nib and improve the wear resistance of the nib;

The stylus tip is processed by sintering molding, the process control is relatively simple, and the quality of the finished product is stable. At the same time, the stylus tip made by sintering has uneven surface appearance and a certain roughness, and the roughness can be adjusted by Sintering temperature and pressure adjustment; appropriate surface friction coefficient can make the nib not too damp when writing, and at the same time can get the friction feeling of real writing;

The addition of the structural core rod 20 can greatly increase the structural strength of the stylus pen tip, and in the event of a drop, etc., it can ensure the stability of the pen tip structure and electronic functions to a certain extent, reduce the amount of deformation, and ensure high precision and high sensitivity; By adding the structural core rod 20, the integrity of the stylus tip is increased, and the replacement of the stylus tip is facilitated, avoiding the problem that the slender pen tip is easy to break during replacement; the addition of the structural core material facilitates demoulding after sintering is completed. The long stylus tip requires workers to manually remove the mold due to the high friction between the tip and the mold cavity during demoulding, which increases the processing cycle and labor costs. After adding the structural core material, it can be ejected through the punch on the press when demoulding, which is convenient for production and processing.

2. The drying temperature of each raw material is 75°C to 85°C, preferably, the drying temperature of each raw material is 80°C, which not only ensures the drying environment of the raw materials, but also does not affect the performance of various raw materials.

3. The drying time of each raw material is 1.8 hours to 2.5 hours, preferably, the drying time of each raw material is 2 hours, so that each raw material is fully dried.

4. The mixing machine is a high-speed mixing machine, and the rotating speed of the high-speed mixing machine is 2000r/min to 8000r/min. Preferably, the rotating speed of the high-speed mixing machine is 4500r/min, which saves mixing time and makes the mixing more uniform.

5. The mixing and stirring time of various raw materials is 15 seconds to 30 seconds each time, preferably, the mixing and stirring time of various raw materials is 25 seconds each time, so that the various raw materials are fully mixed.

6. The number of times of repeated mixing of various raw materials is 3 to 6 times, preferably, the number of times of repeated mixing of various raw materials is 4 times, so as to ensure more complete mixing of various raw materials.

7. The heating rate of the sintering furnace is 1°C/min to 5°C/min. Preferably, the heating rate of the sintering furnace is 3°C/min, and the heating temperature of the sintering furnace is 3 degrees per minute. Slowly raise the temperature to avoid excessive heating , to maintain a uniform temperature inside the material and a stable change in material properties.

8. Slowly raise the temperature of the sintering furnace to 120°C to 200°C and keep it warm for 60 minutes to 100 minutes, and choose to sinter in the temperature range of 120°C to 200°C for 60 minutes to 100 minutes, which can ensure that the mixture 10 is in a molten state and can make The molecular structure and molecular aggregation form of polyethylene change to avoid oxidation and degradation, so that the sintered material has better physical properties and can better control the internal microporous structure of the material. According to the experimental results, the temperature of the sintering furnace is slowly raised Sintering at 180°C for 80 minutes, the physical properties of the sintered material are more excellent.

9. The structural core rod 20 is made of metal material or carbon fiber material. Preferably, the metal is iron or stainless steel, but not limited to iron, stainless steel or carbon fiber material, as long as it has a certain strength and is not easy to bend.

10. The shape of the structural core rod 20 is a cylinder, a cuboid or a prism, but not limited to a cylinder, a cuboid or a prism.

11. The structural mandrel 20 includes a main body section 21 and an occlusal section 22 . The outer surface of the occlusal section 22 is provided with seams, indentations or grooves to increase the binding force between the structural mandrel 20 and the mixture 10 .

The above are only specific embodiments of the present invention, and do not limit the protection scope of the present invention; any replacement and improvement made on the basis of not violating the concept of the present invention shall fall within the protection scope of the present invention.

Claims (20)

1. the preparation method of stylus tip, is characterized in that, comprises the following steps: First put various raw materials into a vacuum drying oven for drying treatment, and the various raw materials include powdered high-density polyethylene, powdered low-density polyethylene, lubricant, carbon black, and light calcium carbonate; The dried various raw materials are added to the mixer according to a certain weight percentage for mixing and stirring, and the various raw materials are repeatedly mixed and stirred to form a mixture to be sintered; Insert the structural core rod in the center of the mold cavity, then fill the mixed material into the mold cavity, and coat the outer surface of the structural core rod; Then preliminarily pressurize the mixture filled into the mold cavity through the pressure head, and then put it into the sintering furnace for sintering; After the sintering is completed, it is naturally cooled to room temperature, and finally removed from the mold. 2 . The method for preparing a stylus tip according to claim 1 , wherein the drying temperature of the various raw materials is 75° C. to 85° C. 3. The method for preparing a stylus tip according to claim 2, wherein the drying temperature of the various raw materials is 80°C. 4. The method for preparing a stylus tip according to claim 2, wherein the drying time of the various raw materials is 1.8 hours to 2.5 hours. 5. The preparation method of the stylus tip as claimed in claim 4, characterized in that, the drying time of the plurality of raw materials is 2 hours. 6 . The method for preparing a stylus tip according to claim 1 , wherein the mixing machine is a high-speed mixing machine, and the speed of the high-speed mixing machine is 2000r/min to 8000r/min. 7. The method for preparing a stylus tip according to claim 6, wherein the speed of the high-speed mixer is 4500r/min. 8 . The method for preparing a stylus tip according to claim 6 , wherein the time for each mixing and stirring of the various raw materials is 15 seconds to 30 seconds. 9 . The method for preparing a stylus tip according to claim 8 , wherein the time for each mixing and stirring of the various raw materials is 25 seconds. 10 . 10 . The method for preparing a stylus tip according to claim 8 , characterized in that, the number of times of repeated mixing of multiple raw materials is 3 to 6 times. 11 . 11. The method for preparing a stylus tip as claimed in claim 10, characterized in that, the number of times of repeated mixing of multiple raw materials is 4 times. 12 . The method for preparing a stylus tip according to any one of claims 1 to 11 , wherein the heating rate of the sintering furnace is 1° C./min to 5° C./min. 13 . 13 . The method for preparing a stylus tip according to claim 12 , wherein the heating rate of the sintering furnace is 3° C./min. 14 . 14 . The method for preparing a stylus tip according to claim 12 , wherein the sintering furnace is heated to 120° C. to 200° C. and kept for 60 minutes to 100 minutes. 15 . 15 . The method for preparing a stylus tip according to claim 14 , wherein the sintering furnace is heated to 180° C. and kept for 80 minutes. 16 . 16. The method for manufacturing a stylus tip according to any one of claims 1 to 11, wherein the structural core rod is made of metal material or carbon fiber material. 17. The method for preparing a stylus tip according to claim 16, wherein the metal is iron or stainless steel. 18. The method for manufacturing a touch pen tip according to claim 16, wherein the shape of the structural core rod is a cylinder, a cuboid or a prism. 19. The method for preparing a stylus tip according to any one of claims 1 to 11, wherein the structural core rod comprises a main body section and an occlusal section, and the main body section and the occlusal section are integrally formed and connected, The outer surface of the occlusal section is provided with scratches, indentations or etching grooves; the mixture is coated on the outer surface of the structural core rod and integrally formed by winding it. 20 . The method for manufacturing a stylus tip according to claim 19 , wherein the mixture is coated on the outer surface of the occlusal section, and formed integrally with it. 21 .