Method for producing heat transfer film

Abstract

A method for producing a heat transfer film, comprising: step 1, preparing a piece of release paper (1), and using a digital printer for printing several patterns (2) on the release paper; step 2, using a coating machine for uniformly coating glue on surfaces of said patterns obtained in step 1; step 3, conveying the release paper obtained in step 2 into an oven to completely cure the glue coated on the surfaces of said patterns; and step 4, using an automated winding machine for winding the release paper obtained in step 3, and then cutting the release paper before storing same. The glue is coated specifically in the following manner: a surface of a printing roller of the coating machine is fully covered with glue, the release paper on which said patterns are attached passes through a gap between the printing roller (5) and a transmission roller (6) of the coating machine, and the surface of each pattern on the release paper is brought in contact with the surface of the printing roller and is coated with glue, thereby obtaining a release paper provided with several patterns on the surfaces of which glue is fully coated. According to the described method, during glue coating and fabrication of a release paper full of patterns, plate making is not necessary, and very little glue is used, thus facilitating simplification of the production process, and saving costs.

Description

A method for producing thermal transfer film Technical Field

[0001] The present invention relates to the technical field of film production technology, and in particular to a process for producing films including patterns or textures for thermal transfer. Background Art

[0002] At present, it is a common surface treatment process to transfer various patterns and textures to different product surfaces through heat transfer. With this process, it is necessary to prepare release paper and make several patterns or textures that can be separated from the release paper on the release paper. Common processes include silk screen printing, gravure printing and flexographic printing. With this process, it is necessary to first make a plate according to the designed pattern or texture style, and then print it on the release paper surface. For heat transfer patterns, it is necessary to apply a layer of glue on the pattern surface in advance and let the glue solidify. When applying glue, the glue can only be applied on the surface of the pattern or texture, and cannot be applied to the release paper, because in the subsequent During the heat transfer process, when the pattern or texture is attached to the surface of the product, the release paper needs to be torn off, that is, separated from the pattern. If glue is applied to the release paper, it will cause the release paper to stick to the product. Therefore, when applying glue with a coating machine, the glue should be prevented from being applied to the surface of the release paper. Therefore, before coating, it is also necessary to make a template according to the pattern or texture of the glue coating, and then set the template on the printing roller of the coating machine. The pattern or texture on the template corresponds to the pattern or texture on the release paper, and the pattern or texture on the template is covered with glue so that the pattern or texture surface on the release paper is coated with glue during the coating process. Although this process can apply glue to the pattern or texture surface on the release paper, it requires the production of a template, with many steps and complex processes, resulting in high processing costs and low efficiency. Moreover, in the traditional gravure or screen printing process of heat transfer flower films, a large number of workers are required to participate in plate making, color matching, registration, and printing production. The direct contact between workers and chemical raw materials is extremely harmful to the human body. The use of chemical raw materials and their volatiles in plate making and printing also seriously pollutes the environment.

[0003] Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention aims to provide a method for producing a thermal transfer film.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a method for producing a thermal transfer film,

[0006] Step 1: prepare a release paper, and print a plurality of patterns on the release paper using a digital printer to obtain a release paper with a plurality of patterns attached to the surface;

[0007] Step 2: Evenly coating the plurality of patterned surfaces obtained in the above step with glue using a coating machine; the surface of the printing roller of the coating machine is covered with glue, and the release paper with the plurality of patterns attached passes through the gap between the printing roller and the transmission roller of the coating machine. During this process, each patterned surface on the release paper contacts the surface of the printing roller and is coated with glue, thereby obtaining a plurality of release papers with the patterned surfaces fully coated with glue;

[0008] Step 3: Transfer the release paper obtained in step 2 to a baking oven to allow the glue coated on the pattern surface to completely solidify and dry;

[0009] Step 4: The release paper obtained in step 3 is wound by an automatic winder, and then cut and stored.

[0010] Preferably, in step 2, the gap between the printing roller and the transmission roller is 10-35 μm.

[0011] Preferably, the temperature in the baking oven is 70-90° C., and the drying time is 10s-60s.

[0012] Technical effect: The process of the present invention is used to make a thermal transfer film, and the designed pattern is directly printed onto the surface of the release paper through a digital printer. The pattern includes various shapes, and the pattern is separable from the release paper and protrudes from the surface of the release paper. During the processing, the surface of the printing roller of the coating machine is covered with glue. When the release paper with several patterns attached passes through the gap between the printing roller and the transmission roller, because the pattern protrudes from the surface of the release paper, that is, the thickness of the printed pattern must exceed the thickness of the release paper, the surface of the pattern contacts the surface of the printing roller, and the glue on its surface is coated on the surface of the pattern. Since the release paper does not contact the surface of the printing roller, the glue will not be coated on the surface of the release paper. Compared with the existing process, the present invention does not require plate making when applying glue and making release paper covered with patterns, which is conducive to simplifying the production process, reducing the number of steps, saving costs, and improving processing efficiency. In addition, there is no need for workers to participate in plate making, color matching, positioning, printing production, etc., which is convenient for effectively preventing chemical raw materials from harming the workers' bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of a release paper after a pattern is printed on the release paper according to an embodiment of the present invention;

[0014] FIG2 is a schematic diagram of the coating process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and implementation methods.

[0016] As shown in Figures 1-2, an embodiment of the present invention provides a method for producing a thermal transfer film.

[0017] Step 1: prepare a release paper 1, and print a plurality of patterns 2 on the release paper using a digital printer to obtain a release paper with a plurality of patterns attached to the surface;

[0018] Step 2: Evenly apply glue to the surfaces of the multiple patterns obtained in the above step using a coating machine; the coating machine includes a glue tank 3 containing glue, which transfers the glue to a printing roller 5 via a glue roller 4, and the surface of the printing roller of the coating machine is covered with glue. The release paper 1 with multiple patterns attached passes through the gap between the printing roller 5 and the transmission roller 6 of the coating machine. During this process, the surface of each pattern 2 on the release paper 1 contacts the surface of the printing roller 5 and is coated with glue, thereby obtaining release paper with multiple patterns coated with glue.

[0019] Step 3: Transfer the release paper obtained in step 2 to a baking oven to allow the glue coated on the pattern surface to completely solidify and dry;

[0020] Step 4: The release paper obtained in step 3 is wound by an automatic winder, cut and stored.

[0021] Preferably, in step 2, the gap between the printing roller and the transmission roller is 10-35 μm.

[0022] Preferably, the temperature in the baking oven is 70-90° C., and the drying time is 10s-60s.

[0023] Example 1

[0024] A method for producing a thermal transfer film,

[0025] Step 1: prepare a release paper 1, and print a plurality of patterns 2 on the release paper using a digital printer to obtain a release paper with a plurality of patterns attached to the surface;

[0026] Step 2: Evenly apply glue to the surfaces of the patterns obtained in the above step using a coating machine; the coating machine includes a glue tank 3 containing glue, which transfers the glue to a printing roller 5 via a glue roller 4 and a transfer roller 7, and the surface of the printing roller of the coating machine is covered with glue. The release paper 1 with the patterns attached passes through the gap between the printing roller 5 and the transfer roller 6 of the coating machine. During this process, the surface of each pattern 2 on the release paper 1 contacts the surface of the printing roller 5 and is coated with glue, thereby obtaining release paper with the patterns fully coated with glue.

[0027] Step 3: Transfer the release paper obtained in step 2 to a baking oven to completely cure the glue coated on the pattern surface;

[0028] Step 4: The release paper obtained in step 3 is wound by an automatic winder, cut and stored.

[0029] In this embodiment, in step 2, the gap between the printing roller and the transmission roller is 25 μm.

[0030] The temperature in the baking oven is 75° C., and the drying time is 30 seconds.

[0031] Example 2

[0032] Compared with Example 1, in step 2, the gap between the printing roller and the transmission roller is 30 μm.

[0033] The temperature in the baking oven is 85° C., and the drying time is 50 seconds.

[0034] In the above description, it should be noted that the terms "installed", "connected", "connected" and other corresponding terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components.

[0035] Obviously, the embodiments described above are only some of the embodiments of the present invention, not all of them. The drawings provide preferred embodiments of the present invention, but do not limit the scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Any equivalent structure made by using the contents of the present description and drawings, directly or indirectly applied to other related technical fields, is also within the scope of protection of the present invention.

Claims

1. A method for producing a thermal transfer film, characterized in that: Step 1: Prepare a release paper, and print a number of patterns on the release paper through a digital printer to obtain a release paper with a number of patterns attached to its surface; Step 2: Uniformly coat glue on the surfaces of the above-mentioned patterns; the surface of the printing roller of the coater is covered with glue, and the release paper with a number of patterns attached passes through the gap between the printing roller and the driving roller of the coater. During this process, the surface of each pattern on the release paper comes into contact with the surface of the printing roller and is coated with glue, obtaining a release paper with the surfaces of a number of patterns coated with glue; Step 3: Transfer the release paper obtained in Step 2 to a baking furnace to completely cure and dry the glue coated on the pattern surface; Step 4: Wind up the release paper obtained in Step 3 through an automatic winding machine, and then cut it and store it in the warehouse.

2. The production method of a thermal transfer film sheet according to claim 1, wherein: In Step 2, the gap between the printing roller and the driving roller is 10 - 35um.

3. The production method of a thermal transfer film sheet according to claim 1, characterized in that: The temperature in the baking furnace is 70 - 90°C, and the drying time is 10s - 60s.

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