Hot stamping pen process

Abstract

This invention discloses a hot stamping pen process. In this process, a first slurry is formed by mixing pretreated wood pulp, zinc chloride solution, and hot-melt fibers through a reaction. This process modifies the surface of the wood pulp and other components by mercapto, increases hydrogen bonding between components, and improves adhesion. The resulting coating slurry, mixed with dyes, is directly applied to and cured on the pen barrel surface. Then, the hot-melt fibers in the cured film layer on the pen barrel surface are melted by the high temperature of the hot stamping plate to form a predetermined pattern. Compared with conventional hot stamping processes, this process helps reduce production costs and improve product competitiveness.

Description

Technical Field

[0001] This invention relates to the field of pattern forming technology, specifically to the hot stamping process. Background Technology

[0002] Hot stamping, also known as foil stamping, is a decorative technique that uses heat to adhere metal foil or other materials to the surface of materials such as paper, fabric, plastic, and wood to create specific patterns or text. This technique is commonly used in bookbinding, greeting card production, and packaging design to add a sense of luxury and sophistication to products. However, its current high cost necessitates improvement. Summary of the Invention

[0003] To address at least one of the aforementioned technical deficiencies, the present invention provides the following technical solution:

[0004] This application discloses a hot stamping pen process, including the following steps:

[0005] First, mix and stir the pretreated wood pulp, zinc chloride solution, and hot-melt fiber, and react at 70-80℃. After the reaction, add N,N'-dimethylformamide and mercaptoacetic acid to the pulp and mix and stir for more than 45 minutes to obtain the first pulp.

[0006] Second, the first slurry is mixed with dye, fixing agent, and thickener and stirred to form a coating slurry;

[0007] Third, apply the coating liquid to the pen barrel and allow it to cure;

[0008] Fourth, use a hot stamping plate to press the predetermined surface of the cured pen barrel.

[0009] In this process, pretreated wood pulp, zinc chloride solution, and hot-melt fibers are mixed and reacted to form a first slurry. This process modifies the surface of the wood pulp and other components by mercapto, increasing hydrogen bonding between components and improving adhesion. The resulting coating slurry, mixed with dyes, is then directly applied to and cured on the pen barrel surface. Subsequently, the hot-melt fibers in the cured film layer on the pen barrel surface are melted and molded into a predetermined pattern using a hot stamping plate at high temperatures. Compared to conventional hot stamping processes, this process helps reduce production costs and improve product competitiveness.

[0010] Furthermore, using softwood pulp powder and hardwood pulp powder as raw materials, water is added to adjust the pulp. Sodium bromide, catalyst, and sodium hypochlorite are added to the pulp to react and oxidize the hydroxyl groups in the pulp powder to carboxyl groups. Then, anhydrous ethanol is added to terminate the reaction to obtain pretreated pulp. After the reaction with sodium bromide, catalyst, and sodium hypochlorite, the hydroxyl groups on the surface of the pulp powder are converted into carboxyl groups, softening the rigid structure of cellulose and helping to improve softness, making it more comfortable to hold.

[0011] Furthermore, the mass ratio of softwood pulp powder to hardwood pulp powder is 1:1-2, and the mass ratio of pulp powder, sodium bromide, catalyst, sodium hypochlorite (10% by mass), and anhydrous ethanol is 10g:0.7-0.8g:0.1-0.15g:75-85ml:4-8ml.

[0012] Furthermore, the mass ratio of the sum of softwood pulp powder and hardwood pulp powder to hot-melt fiber is 1:0.1-0.2, and the mass ratio of the sum of softwood pulp powder and hardwood pulp powder to dye, fixing agent, and thickener is 1:0.01-0.015:0.01-0.015:0.02-0.03.

[0013] Furthermore, softwood pulp powder and hardwood pulp powder are used as raw materials, and water is added to adjust the pulp concentration to 5-15%.

[0014] Furthermore, the mass ratio of the 50% zinc chloride solution to the wood pulp is 1:10-15.

[0015] Furthermore, the viscosity of the coating slurry is 100-200 Pa·s, which facilitates coating and molding and avoids overflowing.

[0016] Furthermore, the curing temperature is between 60-100℃, and the melting point of the hot-melt fiber is 120℃.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention designs a coating liquid composition that is pre-coated and cured on the surface of the pen barrel. Then, the hot-melt fibers in the film layer on the surface of the pen barrel are melted and formed into a pattern by hot stamping at high temperature, which helps to reduce production costs. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] Preparation of pretreated wood pulp:

[0021] Softwood pulp powder and hardwood pulp powder were used as raw materials, and water was added to adjust the pulp concentration to 10%. The mass ratio of softwood pulp powder to hardwood pulp powder was 1:1. Sodium bromide (7% by mass of wood pulp powder) and catalyst (2,2,6,6-tetramethylpiperidine oxide) (1.2% by mass of wood pulp powder) were added to the pulp. The mass-volume ratio of wood pulp powder to sodium hypochlorite (10%) was 10g:85ml. The mixture was stirred and reacted for 2.5h. During the reaction, the pH value was adjusted to 9.5 with alkaline solution. Finally, anhydrous ethanol was added to terminate the reaction. The mass-volume ratio of wood pulp powder to anhydrous ethanol was 10g:4.5ml. After the reaction was completed, the mixture was filtered, and the filter residue was mixed with deionized water to form a pulp concentration of 25%. After homogenization, a pretreated wood pulp was formed.

[0022] The hot-melt fiber is SWP fiber, with a melting point of 120℃.

[0023] The zinc chloride solution concentration is 50%.

[0024] Example 1

[0025] The hot stamping process includes the following steps:

[0026] First, the pretreated wood pulp, zinc chloride solution, and hot-melt fiber are mixed and stirred. The hot-melt fiber accounts for 15% of the total mass of softwood pulp powder and hardwood pulp powder. The mass ratio of zinc chloride solution to pretreated wood pulp is 1:12. After stirring evenly, the temperature is raised to 75°C and maintained for 40 minutes to obtain a reaction solution. Then, N,N'-dimethylformamide and mercaptoacetic acid are added. By mass, N,N'-dimethylformamide accounts for 25% of the reaction solution, and mercaptoacetic acid accounts for 20% of the reaction solution. Stirring is continued for 60 minutes to obtain the first pulp.

[0027] Second, the first slurry is mixed with dye, fixing agent and thickener and stirred for 2 hours to form a coating slurry (viscosity about 120 Pa·s). The mass ratio of the sum of softwood pulp powder and hardwood pulp powder to dye, fixing agent and thickener is 1:0.01:0.01:0.02. The fixing agent is a resin-type fixing agent.

[0028] Third, place the pen barrel in the predetermined position, apply the coating liquid to the perimeter of the pen barrel, and then cure it at 80°C to form a film.

[0029] Fourth, the pen barrel is fed into the hot stamping equipment, and the hot stamping plate is used to press the predetermined surface of the cured pen barrel. The temperature of the hot stamping plate should be higher than 120℃. The hot stamping plate melts the heat-melting fibers in the film layer on the surface of the pen barrel, causing the color to change and form a pattern.

[0030] Example 2

[0031] The hot stamping process includes the following steps:

[0032] First, the pretreated wood pulp, zinc chloride solution, and hot-melt fiber are mixed and stirred. The hot-melt fiber accounts for 15% of the total mass of softwood pulp powder and hardwood pulp powder. The zinc chloride solution is 1:10 of the pretreated wood pulp. After stirring evenly, the temperature is raised to 80°C and maintained for 60 minutes to obtain a reaction solution. Then, N,N'-dimethylformamide and mercaptoacetic acid are added. By mass, N,N'-dimethylformamide accounts for 20% of the reaction solution, and mercaptoacetic acid accounts for 25% of the reaction solution. Stirring is continued for 60 minutes to obtain the first pulp.

[0033] Second, the first slurry is mixed with dye, fixing agent and thickener and stirred for 2.5 hours to form a coating slurry. The mass ratio of the sum of softwood pulp powder and hardwood pulp powder to dye, fixing agent and thickener is 1:0.012:0.011:0.025. The fixing agent is a resin-type fixing agent.

[0034] Third, place the pen barrel in the predetermined position, apply the coating liquid to the perimeter of the pen barrel, and then cure it at 70°C to form a film.

[0035] Fourth, the pen barrel is fed into the hot stamping equipment, and the hot stamping plate is used to press the predetermined surface of the cured pen barrel. The temperature of the hot stamping plate should be higher than 120℃. The hot stamping plate melts the heat-melting fibers in the film layer on the surface of the pen barrel, causing the color to change and form a pattern.

[0036] Example 3

[0037] The hot stamping process includes the following steps:

[0038] First, the pretreated wood pulp, zinc chloride solution, and hot-melt fiber are mixed and stirred. The hot-melt fiber accounts for 15% of the total mass of softwood pulp powder and hardwood pulp powder. The mass ratio of zinc chloride solution to pretreated wood pulp is 1:15. After stirring evenly, the temperature is raised to 78°C and maintained for 50 minutes to obtain a reaction solution. Then, N,N'-dimethylformamide and mercaptoacetic acid are added. By mass, N,N'-dimethylformamide accounts for 25% of the reaction solution, and mercaptoacetic acid accounts for 25% of the reaction solution. Stirring is continued for 60 minutes to obtain the first pulp.

[0039] Second, the first slurry is mixed with dye, fixing agent and thickener and stirred for 2 hours to form a coating slurry. The mass ratio of the sum of softwood pulp powder and hardwood pulp powder to dye, fixing agent and thickener is 1:0.015:0.015:0.03. The fixing agent is a resin-type fixing agent.

[0040] Third, place the pen barrel in the predetermined position, apply the coating liquid to the perimeter of the pen barrel, and then cure it at 90°C to form a film.

[0041] Fourth, the pen barrel is fed into the hot stamping equipment, and the hot stamping plate is used to press the predetermined surface of the cured pen barrel. The temperature of the hot stamping plate should be higher than 120℃. The hot stamping plate melts the heat-melting fibers in the film layer on the surface of the pen barrel, causing the color to change and form a pattern.

[0042] Comparative Example 1

[0043] Compared with Example 3, the difference is that in this example, softwood pulp powder, hardwood pulp powder and deionized water are mixed to form a pulp with a concentration of 25%, and after homogenization, a pretreated wood pulp is formed without carboxylation modification.

[0044] Comparative Example 2

[0045] Compared with Example 3, the difference is that in this example, the pretreated wood pulp is mixed and stirred with hot melt fiber, and zinc chloride, mercaptoacetic acid, etc. are not added.

[0046] Testing revealed that the surface film layer of the pen barrel formed in the embodiment was more flexible. In comparison, Comparative Example 1 showed an increase of approximately 15% in film layer hardness. The surface film layer of the pen barrel formed in the embodiment was more stable and did not peel off, while the surface film layer of the pen barrel formed in Comparative Example 2 showed peeling off. The production cost of the hot stamping pen process in this solution is reduced.

[0047] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A hot stamping pen process, characterized in that, Includes the following steps: First, mix and stir the pretreated wood pulp, zinc chloride solution, and hot-melt fiber, and react at 70-80℃. After the reaction, add N,N'-dimethylformamide and mercaptoacetic acid to the pulp and mix and stir for more than 45 minutes to obtain the first pulp. Second, the first slurry is mixed with dye, fixing agent, and thickener and stirred to form a coating slurry; Third, apply the coating liquid to the pen barrel and allow it to cure; Fourth, use a hot stamping plate to press the predetermined surface of the cured pen barrel; The process involves using softwood pulp powder and hardwood pulp powder as raw materials, adding water to adjust the pulp, adding sodium bromide, a catalyst, and sodium hypochlorite to the pulp to react and oxidize the hydroxyl groups in the pulp powder to carboxyl groups. Then, anhydrous ethanol is added to terminate the reaction to obtain pretreated wood pulp. The mass ratio of softwood pulp powder to hardwood pulp powder is 1:1-2, and the mass ratio of pulp powder, sodium bromide, catalyst, sodium hypochlorite (10% by mass), and anhydrous ethanol is 10g:0.7-0.8g:0.1-0.15g:75-85ml:4-8ml. The mass ratio of the sum of softwood pulp powder and hardwood pulp powder to hot-melt fiber is 1:0.1-0.2, and the mass ratio of the sum of softwood pulp powder and hardwood pulp powder to dye, fixing agent and thickener is 1:0.01-0.015:0.01-0.015:0.02-0.

03.

2. The hot stamping pen process as described in claim 1, characterized in that: The pulp is made from softwood pulp powder and hardwood pulp powder, mixed with water to a concentration of 5-15%.

3. The hot stamping pen process as described in claim 1, characterized in that: The mass ratio of a 50% zinc chloride solution to wood pulp is 1:10-15.

4. The hot stamping pen process as described in claim 1, characterized in that: The viscosity of the coating slurry is 100-200 Pa·s.

5. The hot stamping pen process as described in claim 1, characterized in that: The curing temperature is 60-100℃, and the melting point of the hot melt fiber is 120℃.