Preparation process of high-temperature-resistant laser heat transfer printing film

Abstract

The invention discloses a preparation process of a high-temperature-resistant laser heat transfer film. The preparation process comprises the following steps: S1) selecting a high-quality PET (Polyethylene Terephthalate) film; s2) cleaning the PET film; s3) coating the PET film with a laser coating, wherein the coating moisture content is controlled within a range of 5-8 g / m; s4) drying the laser coating; s5) carrying out laser pattern compression molding; s6) transferring the pressed laser film into a printing process, and printing a transfer printing film; s7) carrying out vacuum aluminum plating on the printed transfer printing film; s8) carrying out aluminum washing on the aluminum-plated transfer printing film; s9) drying the transfer printing film subjected to aluminum washing; and S10) coating the dried transfer printing film with glue. According to the preparation technology of the high-temperature-resistant laser heat transfer printing film, on the basis of the heat transfer printing film, a high-temperature laser technology is combined, the high-temperature-resistant laser heat transfer printing film is prepared, and the laser effect, the metal color and the printing effect of common color ink on the surface of a printing stock can be achieved only through one procedure of heat transfer printing in subsequent use; and the reproduction performance of the printed pattern is improved.

Description

Technical Field

[0001] The invention belongs to the field of transfer film preparation, and particularly relates to a preparation process of a high-temperature resistant laser thermal transfer film. Background Art

[0002] Thermal transfer film is widely used in surface decoration of various materials, including plastic products, metal products, glass and ceramic products, bamboo and wood products, etc. It prints patterns or texts on the substrate film in advance, and then transfers the images and texts to the substrate through the action of heat and pressure.

[0003] However, the gorgeous laser and metal effects on the surface of the substrate require the use of metallic pigments, or extremely expensive laser inks, and require multiple processes and printing to achieve these color combinations; some substrates with extremely dark background colors often show through during thermal transfer, thus affecting the reproduction of the pattern.

[0004] At the same time, thermal transfer films that are not resistant to high temperatures are prone to aging and have a short service life. Summary of the invention

[0005] Purpose of the invention: In order to overcome the above shortcomings, the purpose of the present invention is to provide a preparation process of a high-temperature resistant laser thermal transfer film. On the basis of the thermal transfer film, a high-temperature laser process is combined to prepare a high-temperature resistant laser thermal transfer film, which extends the service life. In subsequent use, only one thermal transfer process is required to achieve the laser effect on the surface of the substrate, the printing effect of metallic color and ordinary color ink, and the reproduction performance of the printed pattern is improved.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a preparation process of a high temperature resistant laser thermal transfer film, comprising the following steps: S1) Select high-quality PET film; S2) cleaning the PET film; S3) Apply laser coating on PET film, and control the coating wet weight within the range of 5-8 g / m²; S4) Drying laser coating; S5) Laser pattern stamping; S6) transferring the pressed laser film to the printing process to print the transfer film; S7) vacuum aluminum plating the printed transfer film; S8) washing the aluminum-plated transfer film; S9) drying the transfer film after aluminum washing; S10) Apply glue to the dried transfer film.

[0007] Furthermore, the environment of the die pressing process in S5) is set as follows: temperature of 1100°C, pressure of 16-20kg, and speed of 20-30 m / min. The high temperature of 1100°C can ensure that the coating layer is fully softened, which is conducive to the clear transfer of the laser pattern; the pressure range of 16-20kg can ensure the uniformity and suitability of the die pressure; the speed of the coating film and the laser pattern carrier film passing through the die pressing machine is kept consistent, ensuring the transfer effect of the laser pattern and the stability of the production process.

[0008] Furthermore, the transfer film in S6) is printed with alcohol-resistant resin ink. Alcohol-resistant resin ink can remain stable under the action of chemicals such as alcohol, is not easy to fall off or fade, and is more environmentally friendly.

[0009] Furthermore, the laser coating in S3) is 12-18 parts of methyl methacrylate, 9-10 parts of water-soluble acrylate, 50-70 parts of deionized water, 0.5-3 parts of emulsifier, 3-6 parts of silane coupling agent, 0.1-0.5 parts of buffer, 0.01-0.1 parts of defoamer, 0.2-0.6 parts of initiator, and 0.3-1 parts of neutralizer. The ratio of methyl methacrylate and water-soluble acrylate improves the stability of the laser anti-counterfeiting layer.

[0010] Furthermore, the environment for drying the laser coating in S4) is set as follows: the temperature is 140-190° C., and the drying time is 3-8 seconds. This environment can accelerate the curing process of the coating, allowing the laser pattern to be formed quickly, thereby improving production efficiency.

[0011] Furthermore, the thickness of the vacuum aluminum plating in S7) is 0.2-0.3 microns. The aluminum-plated film has good adaptability to post-processing such as printing and lamination, so that the film after laser pattern molding can be easily processed.

[0012] Furthermore, the environment for drying the transfer film in S9) is set as follows: the temperature is 55°C and the drying time is 20 hours. The lower drying temperature of 55°C helps to protect the physical and chemical properties of the transfer film and avoid material changes or damage caused by high temperature; at the same time, the 20-hour drying time can ensure that the coating or ink is fully cured on the transfer film, improve the bonding strength with the substrate, and ensure the durability and stability of the laser pattern.

[0013] It can be seen from the above technical solution that the present invention has the following beneficial effects: 1. The present invention provides a preparation process for a high temperature resistant laser thermal transfer film. On the basis of the thermal transfer film, the laser process is combined to extend the service life. The subsequent use only requires one thermal transfer process, thereby improving the use efficiency of the product. 2. The preparation process of a high temperature resistant laser thermal transfer film of the present invention integrates the laser effect on the surface of the substrate, the printing effect of metal color and ordinary color ink, and improves the reproduction performance of the printed pattern. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are described in detail below. Example

[0015] In this embodiment, the present invention discloses a preparation process of a high temperature resistant laser thermal transfer film, comprising the following steps: S1): Select high-quality PET film; S2): Cleaning the PET film; S3): coating laser coating on PET film; S4): Drying laser coating; S5): realizing laser pattern embossing by using laser embossing equipment; S6): transferring the pressed laser film to the printing process to print the transfer film; S7): vacuum aluminum plating the printed transfer film; S8): Wash the aluminum-plated transfer film; S9): Drying the transfer film after aluminum washing; S10): Apply glue to the dried transfer film.

[0016] Specifically, in S1), a PET film that has been sprayed or electrophoresed is selected, and the thickness range is 20-100um; Specifically, in S2), a plasma cleaning machine is used in combination with a water tank to treat the surface of the PET film to remove impurities such as organic and inorganic substances on the surface and improve the surface energy and adhesion.

[0017] Specifically, in S8), the aluminum washing must ensure that the aluminum layer can be completely cleaned, while avoiding damage to the laser pattern.

[0018] In this embodiment, the environment of the compression molding process in S5) is set as follows: temperature is 1100° C., pressure is 16-20 kg, and speed is 20-30 m / min.

[0019] Specifically, the laser molding equipment in S5) is tested before formal production to determine the optimal temperature, speed and tension parameters.

[0020] Particularly, a temperature of 1000° C., a pressure of 15 kg, and a speed of 25 m / min is another preferred embodiment.

[0021] In this embodiment, the transfer film in S6) is printed using alcohol-resistant resin ink.

[0022] Specifically, the thickness of the ink during printing is 5 um.

[0023] In particular, the printing of the transfer film in S6) can adopt a white ink direct spraying process as a preferred embodiment, and directly spray the white ink on the surface of the laser film to improve production efficiency and precision.

[0024] In this embodiment, the laser coating in S3) is 12-18 parts of methyl methacrylate, 9-10 parts of water-soluble acrylate, 50-70 parts of deionized water, 0.5-3 parts of emulsifier, 3-6 parts of silane coupling agent, 0.1-0.5 parts of buffer, 0.01-0.1 parts of defoaming agent, 0.2-0.6 parts of initiator, and 0.3-1 parts of neutralizer.

[0025] Specifically, the laser coating in S3) is a set of preferred embodiments, which comprises 15 parts of methyl methacrylate, 10 parts of water-soluble acrylate, 60 parts of deionized water, 1 part of emulsifier, 4 parts of silane coupling agent, 0.3 parts of buffer, 0.05 parts of defoamer, 0.5 parts of initiator, and 0.6 parts of neutralizer.

[0026] In this embodiment, the environment for drying the laser coating in S4) is set as follows: the temperature is 140-190° C., and the drying time is 3-8 seconds.

[0027] Specifically, a hot air oven is used in conjunction with a temperature sensor to ensure the stability of the environmental setting for drying laser coatings.

[0028] Particularly, the temperature is 200° C. and the drying time is 2 seconds, which is another preferred embodiment.

[0029] In this embodiment, the thickness of the vacuum aluminum plating in S7) is 0.2-0.3 microns.

[0030] In particular, the thickness of the aluminum coating is controlled by controlling the evaporation rate of the metal aluminum, the moving speed of the substrate film, and the vacuum degree in the evaporation chamber.

[0031] In this embodiment, the environment for drying the transfer film in S9) is set as follows: the temperature is 55° C. and the drying time is 20 hours.

[0032] Specifically, the transfer film coated with glue is re-inspected and rolled up by a rolling mechanism.

[0033] In particular, in the retest, the tape is attached to the glue-coated PET film and then peeled off at a certain angle and speed, and the peel force is measured to evaluate the adhesion of the glue on the PET film.

[0034] In particular, PET glue is preferably used as glue.

[0035] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A process for preparing a high temperature resistant laser thermal transfer film, characterized in that: The steps include: S1): Select high-quality PET film; S2): Cleaning the PET film; S3): Apply laser coating on PET film, and control the coating wet weight within the range of 5-8 g / m²; S4): Drying laser coating; S5): Laser pattern stamping; S6): transferring the pressed laser film to the printing process to print the transfer film; S7): vacuum aluminum plating the printed transfer film; S8): Wash the aluminum-plated transfer film; S9): Drying the transfer film after aluminum washing; S10): Apply glue to the dried transfer film.

2. The preparation process of the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The die pressing process environment in S5) is set as follows: The temperature is 1100°C, the pressure is 16~20kg, and the speed is 20~30m / min.

3. The preparation process of the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The transfer film in S6) is printed using alcohol-resistant resin ink.

4. The preparation process of the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The laser coating in S3) is composed of 12 to 18 parts of methyl methacrylate, 9 to 10 parts of water-soluble acrylate, 50 to 70 parts of deionized water, 0.5 to 3 parts of emulsifier, 3 to 6 parts of silane coupling agent, 0.1 to 0.5 parts of buffer, 0.01 to 0.1 parts of defoamer, 0.2 to 0.6 parts of initiator, and 0.3 to 1 parts of neutralizer.

5. The preparation process of the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The environment setting for drying the laser coating in S4) is as follows: The temperature is 140~190℃ and the drying time is 3~8 seconds.

6. The process for preparing the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The thickness of the vacuum aluminum plating in S7) is 0.2~0.3 filaments.

7. The process for preparing the high temperature resistant laser thermal transfer film according to claim 1, characterized in that: The environment setting for drying the transfer film in S9) is as follows: The temperature is 55°C and the drying time is 20 hours.