Manufacturing method of pencil salient point

Abstract

The invention discloses a manufacturing method of a pencil salient point. According to the pencil, the convex points are additionally arranged on the surface of the pencil, so that the contact area of fingers and the pencil can be increased, the pressure during pencil holding is dispersed, and the fatigue feeling of the fingers is relieved. The design of the salient points can be adjusted according to the pen holding habit of a user, the diameter of the salient points is 1-2mm, and the distance between the salient points is 2-4mm, so that the pen is more comfortable and natural to hold. In addition, the salient point material has good flexibility and adhesion, so that the impact force during pen holding can be effectively buffered, and the pen holding comfort is further improved. And the salient points can increase the friction force between the fingers and the pencil, so that the holding stability of the pencil is improved. In the writing or drawing process, the protruding points can prevent the pencil from sliding, and the pencil can be held more stably. The method is particularly important for a user who needs to finely control the writing or drawing skill of the pencil, and the accuracy and smoothness of writing or drawing can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pencils, and in particular relates to a method for manufacturing a pencil convex point. Background Art

[0002] Traditional pencil designs usually use a smooth cylindrical surface, which has some problems when holding the pen. First, the smooth surface can easily cause finger fatigue and slippage, especially when writing or drawing for a long time. Second, the smooth surface lacks sufficient friction, making the pen grip unstable and easily affecting the accuracy and fluency of writing or drawing. In addition, the traditional pencil design cannot be personalized according to the user's pen holding habits and cannot meet the needs of different users.

[0003] To address the above issues, some improved pencil designs use surface textures or grooves. However, these designs are often not comfortable enough and are easily worn out during writing or drawing. The texture or groove design may cause excessive friction between the fingers and the pencil, causing pain or discomfort to the fingers. In addition, these designs are usually not personalized according to the user's pen-holding habits and cannot meet the needs of different users. Summary of the invention

[0004] The purpose of the present invention is to provide a method for making a pencil bump in order to solve the above-mentioned problem.

[0005] The technical solution adopted by the present invention is as follows: a method for making a pencil convex point, the method comprising the following steps:

[0006] S1: Prepare materials: Evenly mix epoxy acrylate, polyester acrylate, trimethylolpropane triacrylate, photoinitiator and matting powder according to the formula ratio to obtain a mixed solution;

[0007] S2: Preparation of bump mold: Design and manufacture of pencil bump mold, the shape of the mold can be adjusted according to the pencil shape and bump design;

[0008] S3: Applying the mixed liquid: Applying the mixed liquid evenly on the surface of the mold, and adjusting the thickness according to the size and shape of the bumps;

[0009] S4: Curing: Place the mold coated with the mixed liquid under ultraviolet light to make the photoinitiator in the mixed liquid undergo photopolymerization reaction and solidify into solid convex points. The curing time is adjusted according to the intensity of the ultraviolet light and the thickness of the mixed liquid;

[0010] S5: demoulding: removing the solidified bump from the mold;

[0011] S6: Surface treatment: Grind and polish the surface of the convex points as needed to make them smoother and more beautiful;

[0012] S7: Assembling: pasting or fixing the prepared convex points on the surface of the pencil to complete the production of the pencil convex points;

[0013] S8: Quality control: Check the quality of the finished pencil bumps to ensure that the shape, size and surface quality of the bumps meet the requirements;

[0014] S9: Packaging: Pack the finished pencils and prepare them for sale or use.

[0015] In a preferred embodiment, in step S1, the formula ratio is: 60% epoxy acrylate, 10% polyester acrylate, 20% trimethylolpropane triacrylate, 4% photoinitiator and 6% matting powder.

[0016] In a preferred embodiment, in step S2, a 3D model of the bump mold is designed using CAD software based on the pencil shape and bump design. The mold shape can be circular, oval, triangular, etc. The bump size and spacing can be adjusted according to the user's pen-holding habits. The bump diameter is 1-2mm, and the bump spacing is 2-4mm. Import the designed 3D model into CNC processing equipment, such as a CNC milling machine or a 3D printer, and select appropriate materials and processing parameters for processing. The mold material can be selected from aluminum alloy, stainless steel or silicone rubber, etc., which have good wear resistance and high temperature resistance. Aluminum alloy with a hardness of HRC55 is selected as the mold material.

[0017] In a preferred embodiment, in step S3, the mixed solution is evenly applied to the mold surface using a brush or spray gun. The coating thickness is adjusted according to the size and shape of the bumps, generally controlled within the range of 0.5-1.5 mm, and the coating thickness is 1 mm. During the coating process, care should be taken to avoid bubbles and flow, and the coating speed is controlled within the range of 10-20 mm / s.

[0018] In a preferred embodiment, in step S4, the curing time is adjusted according to the intensity of the UV lamp and the thickness of the mixed solution, and is generally controlled within the range of 1-5 minutes, and the curing time is 3 minutes. The wavelength of the UV lamp should be selected to match the absorption peak of the photoinitiator, 365nm, and the power density of the UV lamp is controlled within the range of 2-4mW / cm2.

[0019] In a preferred embodiment, in step S5, during the demolding process, care should be taken to avoid damaging the shape and surface quality of the bumps, the demolding temperature is controlled within the room temperature range, and the demolding speed is controlled within the range of 10-20 mm / s.

[0020] In a preferred embodiment, in step S6, the grinding material can be selected from sandpaper, polishing cloth or polishing liquid, etc., and is adjusted according to the surface roughness of the convex point, and 400-800 mesh sandpaper is selected for grinding. During the polishing process, attention should be paid to controlling the strength to avoid excessive wear of the convex point surface, and the polishing speed is controlled within the range of 50-100rpm.

[0021] In a preferred embodiment, in step S7, the adhesive material can be double-sided adhesive, hot melt adhesive or silicone, etc., which has good adhesion and durability, and double-sided adhesive with an adhesion strength of 2-3N / mm is selected as the adhesive material. During the fixing process, attention should be paid to the position and angle of the convex point to ensure that it fits tightly with the pencil surface, and the deviation of the convex point position is controlled within the range of ±0.1mm.

[0022] In a preferred embodiment, in step S8, the inspection contents include indicators such as bump shape, size, surface roughness, adhesion strength, etc. Unqualified bumps should be reworked or scrapped in time, the bump size deviation should be controlled within the range of ±0.2mm, and the bump surface roughness should be controlled within the range of Ra0.2-0.5.

[0023] In a preferred embodiment, in step S9, the packaging material is a paper box, a plastic box or a blister box, which has good protection and aesthetics. During the packaging process, care should be taken to protect the surface of the convex point to avoid scratches or damage, and the compressive strength of the packaging box is controlled within the range of 1.5-2.0 MPa.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In the present invention, by adding convex points on the surface of the pencil, the contact area between the finger and the pencil can be increased, thereby dispersing the pressure when holding the pencil and reducing the fatigue of the finger. The design of the convex points can be adjusted according to the user's pen-holding habits. The diameter of the convex points is 1-2 mm, and the convex point spacing is 2-4 mm, making the pen-holding more comfortable and natural. In addition, the convex point material has good flexibility and adhesion, which can effectively buffer the impact force when holding the pen, further improving the comfort of holding the pen.

[0026] 2. In the present invention, the convex points can increase the friction between the fingers and the pencil, thereby improving the stability of the pencil grip. During writing or drawing, the convex points can prevent the pencil from sliding, making the pencil grip more stable. This is particularly important for users who need to finely control the writing or drawing skills of the pencil, and can effectively improve the accuracy and fluency of writing or drawing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the process principle of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Reference Figure 1 ,

[0030] A method for making a pencil convex point, the method comprising the following steps:

[0031] S1: Prepare materials: Evenly mix epoxy acrylate, polyester acrylate, trimethylolpropane triacrylate, photoinitiator and matting powder according to the formula ratio to obtain a mixed solution;

[0032] S2: Preparation of bump mold: Design and manufacture of pencil bump mold, the shape of the mold can be adjusted according to the pencil shape and bump design;

[0033] S3: Applying the mixed liquid: Applying the mixed liquid evenly on the surface of the mold, and adjusting the thickness according to the size and shape of the bumps;

[0034] S4: Curing: Place the mold coated with the mixed liquid under ultraviolet light to make the photoinitiator in the mixed liquid undergo photopolymerization reaction and solidify into solid convex points. The curing time is adjusted according to the intensity of the ultraviolet light and the thickness of the mixed liquid;

[0035] S5: demoulding: removing the solidified bump from the mold;

[0036] S6: Surface treatment: Grind and polish the surface of the convex points as needed to make them smoother and more beautiful;

[0037] S7: Assembling: pasting or fixing the prepared convex points on the surface of the pencil to complete the production of the pencil convex points;

[0038] S8: Quality control: Check the quality of the finished pencil bumps to ensure that the shape, size and surface quality of the bumps meet the requirements;

[0039] S9: Packaging: Pack the finished pencils and prepare them for sale or use.

[0040] In step S1, the formula ratio is: 60% epoxy acrylate, 10% polyester acrylate, 20% trimethylolpropane triacrylate, 4% photoinitiator and 6% matting powder.

[0041] In step S2, according to the pencil shape and the bump design, the 3D model of the bump mold is designed using CAD software. The mold shape is circular, oval, triangular, etc. The bump size and spacing can be adjusted according to the user's pen holding habits. The bump diameter is 1-2mm and the bump spacing is 2-4mm.

[0042] Import the designed 3D model into CNC processing equipment, such as CNC milling machine or 3D printer, and select appropriate materials and processing parameters for processing. The mold material is selected from aluminum alloy, stainless steel or silicone rubber, etc., which has good wear resistance and high temperature resistance. Aluminum alloy with a hardness of HRC55 is selected as the mold material.

[0043] In step S3, the mixed liquid is evenly applied to the mold surface using a brush or spray gun. The coating thickness is adjusted according to the size and shape of the bumps, generally controlled within the range of 0.5-1.5 mm, and the coating thickness is 1 mm. During the coating process, care should be taken to avoid bubbles and flow, and the coating speed is controlled within the range of 10-20 mm / s.

[0044] In step S4, the curing time is adjusted according to the intensity of the UV lamp and the thickness of the mixed solution, and is generally controlled within the range of 1-5 minutes, and the curing time is 3 minutes. The wavelength of the UV lamp should be selected to match the absorption peak of the photoinitiator, 365nm, and the power density of the UV lamp is controlled within the range of 2-4mW / cm2.

[0045] In step S5, during the demoulding process, care should be taken to avoid damaging the shape and surface quality of the bumps, the demoulding temperature is controlled within the room temperature range, and the demoulding speed is controlled within the range of 10-20 mm / s.

[0046] In step S6, the polishing material is selected from sandpaper, polishing cloth or polishing liquid, etc., and is adjusted according to the surface roughness of the convex point, and 400-800 purpose sandpaper is selected for polishing. During the polishing process, attention should be paid to controlling the strength to avoid excessive wear of the convex point surface, and the polishing speed is controlled within the range of 50-100rpm.

[0047] In step S7, the adhesive material is double-sided adhesive, hot melt adhesive or silicone, etc., which has good adhesion and durability, and the double-sided adhesive with an adhesion strength of 2-3N / mm is selected as the adhesive material. During the fixing process, attention should be paid to the position and angle of the convex point to ensure that it fits tightly with the pencil surface, and the deviation of the convex point position is controlled within the range of ±0.1mm.

[0048] In step S8, the inspection contents include indicators such as bump shape, size, surface roughness, adhesion strength, etc. Unqualified bumps should be reworked or scrapped in time, and the bump size deviation should be controlled within the range of ±0.2mm, and the bump surface roughness should be controlled within the range of Ra0.2-0.5.

[0049] In step S9, the packaging material is a paper box, a plastic box or a blister box, which has good protection and aesthetics. During the packaging process, care should be taken to protect the surface of the convex point to avoid scratches or damage, and the compressive strength of the packaging box is controlled within the range of 1.5-2.0 MPa.

[0050] From the above we know:

[0051] In the present invention, by adding convex points on the surface of the pencil, the contact area between the finger and the pencil is increased, thereby dispersing the pressure when holding the pencil and reducing the fatigue of the finger. The design of the convex points is adjusted according to the user's pen-holding habits. The diameter of the convex points is 1-2 mm, and the convex point spacing is 2-4 mm, making the pen-holding more comfortable and natural. In addition, the convex point material has good flexibility and adhesion, effectively buffering the impact force when holding the pen, and further improving the comfort of holding the pen.

[0052] In the present invention, the protrusions increase the friction between the fingers and the pencil, thereby improving the stability of the pencil's grip. During writing or drawing, the protrusions prevent the pencil from sliding, making the pencil grip more stable. This is particularly important for users who need to finely control the pencil's writing or drawing skills, and effectively improves the accuracy and fluency of writing or drawing.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for making a pencil convex point, characterized in that: The method comprises the following steps: S1: Prepare materials: Evenly mix epoxy acrylate, polyester acrylate, trimethylolpropane triacrylate, photoinitiator and matting powder according to the formula ratio to obtain a mixed solution; S2: Preparation of bump mold: Design and manufacture of pencil bump mold, the shape of the mold can be adjusted according to the pencil shape and bump design; S3: Applying the mixed liquid: Applying the mixed liquid evenly on the surface of the mold, and adjusting the thickness according to the size and shape of the bumps; S4: Curing: placing the mold coated with the mixed liquid under ultraviolet light to cause the photoinitiator in the mixed liquid to undergo photopolymerization reaction and solidify into solid convex dots; the curing time is adjusted according to the intensity of the ultraviolet light and the thickness of the mixed liquid; S5: demoulding: removing the solidified bump from the mold; S6: Surface treatment: Grind and polish the surface of the convex points as needed to make them smoother and more beautiful; S7: Assembling: pasting or fixing the prepared convex points on the surface of the pencil to complete the production of the pencil convex points; S8: Quality control: Check the quality of the finished pencil bumps to ensure that the shape, size and surface quality of the bumps meet the requirements; S9: Packaging: Pack the finished pencils and prepare them for sale or use.

2. A method for making a pencil convex point as claimed in claim 1, characterized in that: In the step S1, the formula ratio is: 60% epoxy acrylate, 10% polyester acrylate, 20% trimethylolpropane triacrylate, 4% photoinitiator and 6% matting powder.

3. A method for making a pencil convex point as claimed in claim 1, characterized in that: In the step S2, according to the pencil shape and the bump design, a 3D model of the bump mold is designed using CAD software; the mold shape is circular, elliptical, or triangular, and the bump size and spacing can be adjusted according to the user's pen-holding habits. The bump diameter is 1-2 mm, and the bump spacing is 2-4 mm; Import the designed 3D model into CNC processing equipment, such as CNC milling machine or 3D printer, and select appropriate materials and processing parameters for processing; the mold material should be aluminum alloy, stainless steel or silicone rubber, which has good wear resistance and high temperature resistance, and aluminum alloy with a hardness of HRC55 should be selected as the mold material.

4. A method for making a pencil convex point as claimed in claim 1, characterized in that: In step S3, the mixed liquid is evenly applied to the mold surface using a brush or a spray gun; the coating thickness is adjusted according to the size and shape of the bumps, generally controlled within the range of 0.5-1.5 mm, and the coating thickness is 1 mm; during the coating process, care is taken to avoid bubbles and flow, and the coating speed is controlled within the range of 10-20 mm / s.

5. A method for making a pencil convex point as claimed in claim 1, characterized in that: In step S4, the curing time is adjusted according to the intensity of the ultraviolet lamp and the thickness of the mixed liquid, and is generally controlled within the range of 1-5 minutes, and the curing time is 3 minutes; the wavelength of the ultraviolet lamp is selected to match the absorption peak of the photoinitiator, 365nm, and the power density of the ultraviolet lamp is controlled within the range of 2-4mW / cm2.

6. A method for making a pencil convex point as claimed in claim 1, characterized in that: In the step S5, during the demoulding process, care is taken to avoid damaging the shape of the bumps and the surface quality, the demoulding temperature is controlled within the room temperature range, and the demoulding speed is controlled within the range of 10-20 mm / s.

7. A method for making a pencil convex point as claimed in claim 1, characterized in that: In step S6, the grinding material is selected from sandpaper, polishing cloth or polishing liquid, and is adjusted according to the surface roughness of the bumps, and 400-800 mesh sandpaper is selected for grinding; during the polishing process, pay attention to controlling the strength to avoid excessive wear of the bump surface, and the polishing speed is controlled within the range of 50-100rpm.

8. A method for making a pencil convex point as claimed in claim 1, characterized in that: In step S7, the adhesive material is double-sided adhesive, hot melt adhesive or silicone, which has good adhesion and durability, and the double-sided adhesive with an adhesion strength of 2-3N / mm is selected as the adhesive material; during the fixing process, pay attention to the position and angle of the protrusions to ensure that it fits tightly with the pencil surface, and the deviation of the protrusion position is controlled within the range of ±0.1mm.

9. A method for making a pencil convex point as claimed in claim 1, characterized in that: In step S8, the inspection contents include the bump shape, size, surface roughness, and adhesion strength index; unqualified bumps are promptly reworked or scrapped, the bump size deviation is controlled within the range of ±0.2mm, and the bump surface roughness is controlled within the range of Ra0.2-0.

5.

10. A method for making a pencil bump as claimed in claim 1, characterized in that: In step S9, the packaging material is a paper box, a plastic box or a blister box, which has good protection and aesthetics; during the packaging process, care is taken to protect the surface of the convex points to avoid scratches or damage, and the compressive strength of the packaging box is controlled within the range of 1.5-2.0 MPa.

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