Heat transfer printing coating belt and manufacturing method thereof

Abstract

The invention belongs to the field of printing supplies, and relates to a silk screen plate making technology, in particular to a heat transfer printing coating belt and a manufacturing method thereof. The invention relates to a heat transfer printing coating tape which sequentially comprises a heat-resistant protective layer, a PET (Polyethylene Terephthalate) film, a release layer and a POE (Polyolefin Elastomer) layer from top to bottom. After the thermal transfer printing coating tape is printed, a POE layer is formed on the surface of a screen printing plate, and the screen printing plate can be used for printing oil-based ink and water-based ink. The heat transfer printing coating tape comprises a heat-resistant protective layer, a PET (polyethylene terephthalate) film, a release layer and a POE (polyolefin elastomer) layer. The POE has good affinity with the silk screen after being molten, and is convenient for transfer printing, so that the silk screen does not need to be coated with resin, and the post-processing treatment of the silk screen is reduced.

Description

Technical Field

[0001] The invention belongs to the field of printing consumables, relates to screen plate making technology, and in particular to a thermal transfer coating belt and a manufacturing method thereof. Background Art

[0002] Current screens on the market have a drawback: they can only print water-based inks, not oil-based (solvent-based) inks. This is because, in the prior art, a layer of resin forms on the surface of the screen after printing. Oil-based ink solutions are diluted with benzene-based solvents, and the resin coating is readily soluble in oil-based inks. However, aqueous ink solutions are diluted with water, and the resin coating is insoluble in aqueous inks. Therefore, oil-based inks can damage the resin coating on the screen. The resin on the screen, the printing substrate, originates from a pre-coated coating and transfer via a ribbon (thermal transfer coating). Therefore, improvements to the ribbon are needed to create a screen suitable for printing with oil-based inks.

[0003] The following are relevant existing technologies:

[0004] Thermal transfer coated tape is a consumable material for thermal transfer printers. During printing, the heat-resistant coating (back coating) of the coated tape is in direct contact with the print head, and the ink layer is in direct contact with the substrate. During operation, the print head instantly releases heat, and the heat from the hot spot is transferred to the ink layer through the heat-resistant coating and the substrate layer. The ink melts and is hot-stamped onto the substrate, forming text or images.

[0005] The related prior art, "A Thermal Transfer Printing Method and Thermal Transfer Coating Ribbon," discloses coating the surface of a screen (substrate) with a resin solution and drying it. Correspondingly, the ink layer of the thermal transfer coating ribbon also contains resin, aiming to improve compatibility between the two and facilitate printing. Furthermore, "A Low-Temperature-Resistant and Highly Durable Banner Ribbon" proposes optimizing the components of the thermal transfer coating ribbon. Summary of the Invention

[0006] In view of the above-mentioned defects of the thermal transfer coating tape, the present invention proposes a thermal transfer coating tape and a manufacturing method thereof, which does not require coating a resin solution on the screen during printing.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a thermal transfer coating belt, which includes a heat-resistant protective layer, a PET film, a release layer, and a POE layer from top to bottom.

[0008] A method for manufacturing a thermal transfer coating tape, for manufacturing the thermal transfer coating tape as claimed in claim 1, comprising the steps of:

[0009] S1: coating the heat-resistant protective layer liquid on the back of the PET film and drying it to form a heat-resistant protective layer;

[0010] S2: Coating the release layer liquid on the front of the PET film and drying it to form a release layer;

[0011] S3: Heat POE, melt it and then apply it on the release layer. The liquid POE solidifies to form a POE layer.

[0012] Furthermore, the heat-resistant protective layer in step S1 comprises 80-99 parts of a benzene solvent and 1-20 parts of a polyurethane resin.

[0013] Furthermore, the coating amount of the heat-resistant protective layer liquid in step S1 is: 0.5-5g / ㎡.

[0014] Furthermore, the release layer liquid used in step S2 comprises 70-99 parts of a benzene solvent, 0.01-20 parts of a silicone resin, and 0.5-10 parts of a curing agent.

[0015] Furthermore, the curing agent is diethylenetriamine or triethylenetetramine, or a mixture of both.

[0016] Furthermore, the drying temperature in steps S1 and S2 is 80°C-200°C.

[0017] Furthermore, the coating amount of POE in step S4 is 0.1-5 g / m2.

[0018] Furthermore, in step S3, an organic pigment is added, and the POE and the organic pigment are heated to melt together, stirred to uniformly mix the two, and then coated on the release layer.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are:

[0020] After printing, the thermal transfer coating tape of the present invention forms a POE layer on the surface of the screen plate. The screen plate can be used for printing oil-based ink and water-based ink.

[0021] The thermal transfer coating tape of the present invention includes a heat-resistant protective layer, a PET film, a release layer, and a POE layer. Since the POE has good affinity with the screen after melting, it is easy to transfer, so there is no need to coat the screen with resin, thereby reducing the post-processing treatment (i.e., coating the screen with resin).

[0022] Compared with the ink layer in the prior art, the POE layer in the present invention can be added with organic pigments, but no benzene solvents, fixatives, adhesives, etc. are added during coating. Since it no longer contains benzene solvents, it does not need to be dried, thereby reducing the volatilization of benzene solvents, reducing environmental pollution, and lowering production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 Schematic diagram of the structure of the thermal transfer coating belt.

[0025] In the above figures, 1. heat-resistant protective layer; 2. PET film; 3. release layer; 4. POE layer. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] like Figure 1 As shown, a thermal transfer coating tape has the following structure: from top to bottom, it includes a heat-resistant protective layer, a PET film, a release layer, and a POE layer.

[0029] The heat-resistant protective layer, PET film, and release layer already exist in the prior art, and will not be described in detail in the present invention. In order to solve the problem of being unable to print oil-based inks, the present invention provides a new thermal transfer coating tape, which no longer requires coating a resin solution on the screen during printing. The melting point of the POE used in the present invention is 100°C.

[0030] ~110℃, while the operating temperature of the print head is 110℃~130℃. After the POE on the thermal transfer coating tape is melted, it has good affinity with the screen and is easy to transfer to the screen, so there is no need to coat the resin on the screen.

[0031] A method for manufacturing a thermal transfer coating tape, for manufacturing the thermal transfer coating tape as claimed in claim 1, comprising the steps of:

[0032] S1: coating the heat-resistant protective layer liquid on the back of the PET film and drying it to form a heat-resistant protective layer;

[0033] S2: Coating the release layer liquid on the front of the PET film and drying it to form a release layer;

[0034] S3: Heat POE, melt it and then apply it on the release layer. The liquid POE solidifies to form a POE layer.

[0035] Since POE itself is insoluble in benzene solvents such as toluene, it can be used for printing oil-based inks. In addition, POE can be selected from different POE polymers, such as polyethylene oxide, which is also insoluble in water. Therefore, POE can be used to print both oil-based inks and water-based inks.

[0036] Furthermore, the heat-resistant protective layer in step S1 comprises 80-99 parts of a benzene solvent and 1-20 parts of a polyurethane resin.

[0037] Furthermore, the coating amount of the heat-resistant protective layer liquid in step S1 is 2-5 g / m2.

[0038] Furthermore, the release layer liquid used in step S2 comprises 70-99 parts of a benzene solvent, 0.01-20 parts of a silicone resin, and 0.5-10 parts of a curing agent.

[0039] Furthermore, the curing agent is diethylenetriamine or triethylenetetramine, or a mixture of both.

[0040] Furthermore, the drying temperature in steps S1 and S2 is 80°C-200°C.

[0041] Furthermore, the coating amount of POE in step S3 is 0.1-5 g / m2.

[0042] Furthermore, in step S3, an organic pigment is added, heated to melt the POE and the organic pigment together, stirred to uniformly mix the two, and then coated on the release layer. Since POE is colorless, it is difficult to observe the printing on the screen. After the organic pigment is added, the organic pigment is transferred to the screen along with the POE and develops color, making the printing on the screen easier to observe.

[0043] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A thermal transfer coating tape, characterized in that: From top to bottom, it includes a heat-resistant protective layer, a PET film, a release layer, and a POE layer.

2. A method for manufacturing a thermal transfer coating tape, used for manufacturing the thermal transfer coating tape as claimed in claim 1, characterized in that: Includes steps: S1: coating the heat-resistant protective layer liquid on the back of the PET film and drying it to form a heat-resistant protective layer; S2: coating the release layer liquid on the front side of the PET film and drying it to form a release layer; S3: POE is heated to melt the POE and then coated on the release layer. The liquid POE solidifies to form a POE layer.

3. The method for making a thermal transfer coating tape according to claim 2, characterized in that: The heat-resistant protective layer in step S1 comprises 80-99 parts of a benzene solvent and 1-20 parts of a polyurethane resin.

4. The method for manufacturing a thermal transfer coating tape according to claim 2, characterized in that: The coating amount of the heat-resistant protective layer liquid in step S1 is: 0.5-5g / ㎡.

5. The method for manufacturing a thermal transfer coating tape according to claim 2, characterized in that: The release layer liquid used in step S2 comprises 70-99 parts of a benzene solvent, 0.01-20 parts of a silicone resin, and 0.5-10 parts of a curing agent.

6. The method for manufacturing a thermal transfer coating tape according to claim 5, characterized in that: The curing agent is diethylenetriamine or triethylenetetramine, or a mixture of both.

7. The method for manufacturing a thermal transfer coating tape according to claim 2, characterized in that: The drying temperature in steps S1 and S2 is 80°C-200°C.

8. The method for manufacturing a thermal transfer coating tape according to claim 2, characterized in that: The coating amount of POE in step S3 is 0.1-5 g / ㎡.

9. The method for manufacturing a thermal transfer coating tape according to claim 2, characterized in that: In step S3, an organic pigment is added, and the POE and the organic pigment are heated to melt together, stirred to make the two uniformly mixed, and then coated on the release layer.

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