CN101318420A - Heat transfer printing film, manufacturing process thereof and heat transfer printing manufacturing process - Google Patents

Abstract

A heat transfer film for large-area continuous heat transfer features that a single-color or multi-color pattern with high structural strength of film is directly formed on the surface of metal, glass or ceramic article to be transferred. The manufacturing process of the heat transfer film is to print a continuous plastic film or paper material with a release layer on the surface of the whole roll by using high-temperature resistant pigment ink by using a gravure printing machine to generate a high-temperature resistant pigment ink layer, and coat a high-temperature resistant heat reaction type hot melt adhesive layer on the surface of the high-temperature resistant pigment ink layer. The thermal transfer printing step comprises: a. degreasing and dedusting, namely purifying a transfer printing surface of an article; b. a false fixing step, namely, taking a heat transfer film containing high-temperature-resistant pigment ink and a high-temperature-resistant heat reaction type hot melt adhesive layer, and carrying out heat transfer printing on the transfer-receiving surface in the step a to ensure that the high-temperature-resistant pigment ink layer and the high-temperature-resistant heat reaction type hot melt adhesive layer are fixed on the transfer-receiving surface in a false manner; c. and baking to firmly combine the high-temperature-resistant pigment ink layer, the high-temperature-resistant heat-reaction type hot-melt adhesive layer and the transfer-receiving surface.

Description

A thermal transfer film and its manufacturing process and thermal transfer manufacturing process

technical field

The invention relates to a large-area, continuous thermal transfer thermal transfer film and its manufacturing process and thermal transfer manufacturing process, which is to print a high-temperature-resistant pigment ink on a continuous roll by using printing equipment. In the permanent heat transfer film, use the heat transfer equipment to make the high temperature resistant pigment ink falsely fixed on the transfer surface of the article, and finally use the baking equipment to firmly combine the high temperature resistant pigment ink with the transfer surface of the article.

Background technique

It is still an unachievable research and development goal to use printing equipment to quickly and large-scale produce text or patterns with rich colors, accurate color rendering and high resolution on non-absorbent surfaces such as various metals, glass or ceramics.

Comparing several printing methods currently known with the present invention, lithographic printing is suitable for printing on the surface of general paper or flat single-piece tinplate sheets, but not suitable for printing on rolls, super-long, block-shaped or containing curved surfaces. Printing on the surface of metal sheets or other strip-shaped items.

Screen printing can be directly printed on a metal surface with a curved surface, and then dried. But the disadvantage is that it can only print a small area of graphics, and each time you print a color, you have to wait for it to dry completely. After it dries up, you can screen print the next color. The concentration of the ink will change at any time due to the evaporation of the solvent, and the printing quality is unstable. Disadvantages such as slow speed and high labor cost.

Inkjet printing equipment is suitable for a small amount of various printing, but the equipment is expensive, and most of the water-based dyes used are water-based dyes, which fade quickly and cannot be directly sprayed on the surface of non-absorbent materials such as metal or glass. The printed pattern has poor fineness and large dots, which is usually only suitable for distant viewing and not for short-sightedness. In particular, the speed of printing is slow and cannot meet the requirements of mass production.

Non-direct printing methods are currently known to include PVC DecorateFilm Fastened on Metal Sheet Surfaces, Water Transfer Printing manufacturing process, Thermal Dye Sublimation printing and thermal transfer Alternative methods such as Heat Transfer-Printing manufacturing process.

Decorative metal sheets with PVC film are limited by the poor strength of PVC film, so it is not suitable for further processing after completion, otherwise the pattern on the PVC film may be damaged by the mold and become a substandard product. In addition, when PVC is incinerated, it will produce dioxin, which may cause cancer if inhaled by humans or animals. Governments of various countries have begun to ban it.

In the water transfer printing manufacturing process, a primer must be sprayed on the surface of the metal and ceramics to be transferred, otherwise the transferred ink is not easy to adhere completely. After the transfer, it needs to be washed, dried, and finally sprayed with protective paint to complete. Water transfer printing is suitable for pattern transfer with only patterns on the entire surface, but it is not suitable for text to be included in the transferred pattern, otherwise the text in the pattern will be deformed and unacceptable. In addition, the drying temperature of the water transfer printing operation should not be too high, and the drying time usually takes 2 to 3 hours, which is not only time-consuming but also energy-consuming.

For sublimation transfer printing, powder coating or baking paint must be carried out on the transfer surface of metal and ceramics before sublimation transfer printing can be carried out. The disadvantage is that if there is a place between the thermal transfer paper and the transfer surface that is not tightly attached, the image resolution at that place will immediately be noticeably abnormal and become a substandard product. In addition, the dye-sublimation transfer color is extremely sensitive to changes in transfer temperature and time, and a slight difference in minutes and seconds will cause color differences.

The thermal transfer method is currently applied to the surface of various ABS, PP, plastic, wood, coated metal and other products. The principle is to pre-print the color pattern on the heat-resistant substrate film (through release treatment), and then cooperate with the special transfer printing equipment to transfer it to the surface of the product by hot stamping. The quality of the thermal transfer printing process is reliable and the technology is stable. , Good material formula and close cooperation with equipment.

However, when thermal transfer is applied to non-absorbent surfaces such as metal, glass, and ceramics, interface agents, resins, or other coatings must be applied in advance to make the ink firmly fixed. The current thermal transfer film is made by screen printing, and the pattern area is small. It is used in clothes, cloth bags, hats, pillows, mugs, porcelain plates, ceramic tiles, watch cases, mouse pads, coasters, hanging calendars, and medals. , pennants, work cards, door plates, mirror boxes, metal wine jugs... and other commodities are acceptable, but if they are to be applied to large-scale building materials, such as the transfer printing of colored corrugated boards, large glass plates or entire tiles, etc., technically still To be broken through.

Contents of the invention

The technical problem to be solved by the present invention is to break through the limitations of known technologies and provide a thermal transfer film and manufacturing process that can be directly used for large-area, continuous thermal transfer on various metal, glass or ceramic objects, enabling unlimited length Directly form a printed pattern with good film structure strength on the surface of a flat or curved object.

In order to solve the above technical problems, the present invention proposes a thermal transfer film that can be used for large-area, continuous thermal transfer, including: a high temperature resistant film with a release agent coating on the surface, a high temperature resistant film and a release agent Forming agent coating; a high temperature resistant ink layer connected to one side of the release agent coating; and a high temperature resistant heat reactive hot melt adhesive layer connected to the high temperature resistant ink layer.

The present invention also proposes a thermal transfer film manufacturing process that can be used for large-area, continuous thermal transfer, which includes: a preparation step, preparing a high-temperature resistant film with a release agent coating on the surface, so that it contains at least one A high temperature resistant film and a release agent coating; a printing step, using a printing device to print a high temperature resistant ink layer on the surface of the release agent coating; and a coating step, utilizing a coating device to coat a resistant A high-temperature heat-reactive hot-melt adhesive is applied on the high-temperature-resistant ink layer, thereby forming a high-temperature-resistant heat-reactive hot-melt adhesive layer on the high-temperature resistant ink layer.

The present invention also proposes a thermal transfer manufacturing process capable of large-area and continuous thermal transfer printing, which includes: a. degreasing and dust removal steps to purify the transferred surface of a transfer; b. false fixation step , take a thermal transfer film containing a high temperature resistant ink layer and a high temperature resistant heat reactive hot melt adhesive layer, use a hot roller to roll the high temperature resistant ink layer through the high temperature resistant heat reactive hot melt adhesive layer Falsely fixed on the transferred surface of the transfer; c. Baking step, using a baking device to bake, so that the high temperature resistant ink layer and the high temperature resistant heat reactive hot melt adhesive layer are welded on the transfer Transfer surface.

Therefore, in the present invention, the thermal transfer film can directly form monochrome or color printing patterns with good film structure strength on the transfer surface of various metal, glass or ceramic objects. The manufacturing process of its thermal transfer film is to use gravure printing or other printing equipment to continuously print with high temperature resistant pigment ink on a continuous plastic film or paper with a release layer on the surface to produce a monochrome or color The high temperature resistant pigment ink layer, and a high temperature resistant heat reactive hot melt adhesive layer is coated on the surface of the high temperature resistant pigment ink layer. The steps of thermal transfer printing include: a. degreasing and dust removal steps to purify the transfer surface of an article; b. false fixing step, using a high temperature resistant pigment ink and a high temperature resistant heat reactive hot melt adhesive The first layer of heat transfer film, heat transfer printing is carried out on the transfer surface of the article in step a, so that the high temperature resistant pigment ink layer and the high temperature resistant heat reactive hot melt adhesive layer can be falsely fixed on the transfer surface; c. The baking step enables the high-temperature-resistant pigment ink layer and the high-temperature-resistant heat-reactive hot-melt adhesive layer to be firmly combined with the transfer-receiving surface of the article.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the thermal transfer film and the manufacturing process of the thermal transfer film of the present invention.

Fig. 2 is a schematic diagram of a thermal transfer film of the present invention and a manufacturing process variation embodiment of the thermal transfer film.

Fig. 3 is a schematic diagram of an embodiment of the thermal transfer manufacturing process of the present invention.

Explanation of reference signs:

1: High temperature resistant film with release agent coating on the surface

2: Printing equipment 3: Coating equipment

10: High temperature resistant film 11: Release agent coating

12: Baking equipment 15: Coating equipment

20: High temperature resistant ink layer 30: High temperature resistant heat reactive hot melt adhesive

40: heat transfer film 41: blank film

50: heat transfer film 60: transfer

61: Finished product 70: Baking equipment

150: high temperature resistant transparent adhesive layer

Detailed ways

As shown in Figure 1, a schematic diagram of an embodiment of the thermal transfer film 40 structure and manufacturing process steps of the present invention includes:

1. The preparation step is to prepare a high-temperature-resistant film 1 with a release agent coating on its surface, so that it contains at least a high-temperature-resistant film 10 and a release agent coating 11;

2. The printing step, using a printing device 2 to print a high temperature resistant ink layer 20 on the surface of the release agent coating 10; and

3. Coating step, using a coating device 3 to coat a high-temperature-resistant heat-reactive hot-melt adhesive 30 on the high-temperature-resistant ink layer 20, thereby forming a high-temperature-resistant heat-reactive hot-melt adhesive on the high-temperature resistant ink layer 20 layer.

Through the above steps, the thermal transfer film 40 with a large area and unlimited length can be rapidly mass-produced. Wherein the high-temperature-resistant film 1 containing a release agent coating described in step 1 can be a release paper or a PET release film, which is provided in step 2 for printing in rolls.

The printing equipment 2 in step 2 can be a printing equipment such as a general letterpress printing machine, a flexographic printing machine, or a gravure printing machine, and continuously print limited or infinitely long characters, images or patterns with high-temperature resistant inks, and then apply the release agent The surface of layer 10 is printed with monochrome or colored layer 20 of high temperature resistant ink. When the printing volume is large and the printing quality is required to be exquisite, the gravure printing machine can be used, because the ink of gravure printing has strong expressive power and rich colors, and the printed ink layer is much thicker than that of ordinary letterpress or lithography. The purpose of selecting high-temperature-resistant pigment ink is to make the high-temperature-resistant ink layer 20 of thermal transfer not change color after high-temperature baking; The color can last for a long time in the environment with strong light.

The high-temperature-resistant heat-reactive hot-melt adhesive 30 in step 3 can be a high-temperature-resistant polymer heat-reactive hot-melt adhesive. The purpose of selecting high-temperature-resistant heat-reactive hot-melt adhesive is to allow the adhesive layer and the high-temperature-resistant ink layer 20 to be baked at a high temperature and fixed on the surface of the object, and to maintain stable physical properties at normal temperatures.

Please refer to the schematic diagram of the variation embodiment of the structure and manufacturing process steps of the thermal transfer film 40 of the present invention shown in FIG. 2 , including:

1. The preparation step is to prepare a high-temperature-resistant film 1 with a release agent coating on its surface, so that it contains a high-temperature-resistant film 10 and a release agent coating 11;

2. Coating step, use a coating device 15 to apply a high temperature resistant transparent adhesive on the surface of the release agent coating 11, and then use a baking device 12 to dry the high temperature resistant transparent adhesive to form a high temperature resistant transparent adhesive layer 150;

3. The printing step, using a printing device 2 to print a high temperature resistant ink layer 20 on the surface of the high temperature resistant transparent adhesive layer 150; and

4. Coating step, using a coating device 3 to coat a high-temperature-resistant heat-reactive hot-melt adhesive 30 on the high-temperature-resistant ink layer 20 .

Through the above steps, the thermal transfer film 50 with a large area, unlimited length and a protective layer can be quickly mass-produced. The so-called protective layer is composed of the high temperature resistant transparent adhesive layer 150 produced by coating in step 2 of this embodiment. The high-temperature-resistant transparent adhesive layer 150 in step 2 can be coated with general high-strength transparent UV adhesive or high-temperature-resistant heat-reactive transparent adhesive and dried, and can become the protective layer of the high-temperature resistant ink layer 20 after transfer printing.

The thermal transfer film 40 of the present invention can be used in rolls, and the thermal transfer steps are shown in the embodiment shown in Figure 3, including:

a. degreasing and dust removal steps, purifying the transferred surface of a transfer object 60;

b. False fixation step, take a roll of thermal transfer film 40 containing a high temperature resistant ink layer 20 and a high temperature resistant heat reactive hot melt adhesive layer 30, use a hot roller to transfer at a temperature of 200°C to 250°C The surface of the printed matter 60 is thermally transferred, and at the same time, the transferred blank film 41 (the high temperature resistant film 10 and the release agent layer 11 ) is simultaneously wound up and recovered. Thus, thermal transfer printing can be performed on the surface of a continuous, unlimited length metal, glass or ceramic transfer material 60, so that the high temperature resistant ink layer 20 can be temporarily fixed on the transfer material through the high temperature resistant heat reactive hot melt adhesive layer 30. the transfer-receiving surface of the printed matter 60;

c. Baking step, using a baking device 70 to bake at 150°C to 250°C for 5 minutes to 10 minutes, so that the high temperature resistant ink layer 20 and the high temperature resistant heat reactive hot melt adhesive layer 30 can be welded to the transfer material 60 The transfer surface is formed into a finished product 61 with good adhesion, firmness, good weather resistance, beautiful appearance and wear resistance. If the transfer material 60 is a rolled metal sheet, the transfer surface in this step has the advantages of resistance to bending, reshape processing and roll packaging.

Compared with other known technologies, the thermal transfer film and manufacturing process provided by the present invention have the following advantages:

1. Using the heat transfer printing film of the present invention, articles with non-absorbing surfaces such as metal, glass and ceramics can be directly thermally transferred without powder coating or baking paint. The hard film composed of high-temperature ink and high-temperature-resistant hot-melt adhesive can be firmly combined with the transfer surface to produce the advantages of wear resistance, weather resistance and bending resistance.

2. The traditional thermal transfer film and transfer operation only focus on manual operation and small-area transfer operation, while the thermal transfer film and manufacturing process of the present invention can revolutionize the large-area metal foil packaged in rolls. Transfer printing process produces a protective layer with exquisite printing and unlimited length on its surface, which is impossible for any known technology at present.

3. The scope of application of the present invention can be applied to heat transfer printing on the surface of various metal plates, bars, sheets, packages and formed products. Whether it is iron, aluminum, zinc, copper, white iron, magnesium alloy, aluminum alloy, aluminum-magnesium alloy or titanium alloy, etc., it is suitable for all.

The above detailed description is a specific description provided for a preferred embodiment of the present invention, but the embodiment is not intended to limit the patent scope of the present invention, any equivalent implementation or modification that does not depart from the technical spirit of the present invention shall be should be included in the patent scope of this case.

Claims (17)

1. the heat transfer film that can do large tracts of land, Continuous Heat transfer printing is characterized in that, comprising:

The high temperature resistance diaphragm of mould release coating is contained on one surface, contains a high temperature resistance diaphragm and a mould release coating;

One high temperature resistant printing ink layer is connected in the one side of this mould release coating; And

One high temperature heat-resistant reaction type hot-fusible glue-line is connected on this high temperature resistant printing ink layer.

2. can make the heat transfer film of large tracts of land, Continuous Heat transfer printing according to claim 1, it is characterized in that, the high temperature resistance diaphragm that the mould release coating is contained on this surface is a release liners.

3. can make the heat transfer film of large tracts of land, Continuous Heat transfer printing according to claim 1, it is characterized in that, the high temperature resistance diaphragm that the mould release coating is contained on this surface is a PET mould release membrance.

4. can make the heat transfer film of large tracts of land, Continuous Heat transfer printing according to claim 1, it is characterized in that, still be connected a thermostable transparent glue-line between this is high temperature resistant printing ink layer and this mould release coating.

5. as making the heat transfer film of large tracts of land, Continuous Heat transfer printing as described in the claim 4, it is characterized in that this thermostable transparent glue-line is that transparent UV glue or a high temperature heat-resistant reaction-type transparent glue form.

6. the heat transfer film manufacturing process that can do large tracts of land, Continuous Heat transfer printing is characterized in that, comprising:

One preparation process prepares the high temperature resistance diaphragm that the mould release coating is contained on a surface, makes it contain a high temperature resistance diaphragm and a mould release coating at least;

One print steps utilizes the surface printing one high temperature resistant printing ink layer of a printing equipment in this mould release coating; And

One application step utilizes a coating apparatus to be coated with a high temperature heat-resistant reaction type hot-fusible glue on this high temperature resistant printing ink layer, thereby forms a high temperature heat-resistant reaction type hot-fusible glue-line on this high temperature resistant printing ink layer.

7. as making the heat transfer film manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 6, it is characterized in that the high temperature resistance diaphragm that the mould release coating is contained on the prepared surface of this preparation process is a release liners.

8. as making the heat transfer film manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 6, it is characterized in that the high temperature resistance diaphragm that the mould release coating is contained on the prepared surface of this preparation process is a PET mould release membrance.

9. as making the heat transfer film manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 6, it is characterized in that, after this preparation process, before this print steps, still comprise an application step, coating one thermostable transparent glue and constitute a thermostable transparent glue-line on this mould release coating.

10. as making the heat transfer film manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 9, it is characterized in that this thermostable transparent glue-line is by being coated with a transparent UV glue or a high temperature heat-resistant reaction-type transparent glue forms.

11. as making the heat transfer film manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 9, it is characterized in that, this printing equipment be selected from a letterpress, a flexible board printing machine or an intaglio press one of them.

12. the hot transfer printing manufacturing process that can do large tracts of land, Continuous Heat transfer printing is characterized in that, comprising:

A. degrease, dust removal step purify the transfer surface that is subjected to of a transfer printing thing;

B. false fixing step, take a heat transfer film that contains a high temperature resistant printing ink layer and a high temperature heat-resistant reaction type hot-fusible glue-line, utilize a hot roller rolling to make this high temperature resistant printing ink layer be able to be fixed in the transfer surface that is subjected to of transfer printing thing by this high temperature heat-resistant reaction type hot-fusible glue-line vacation;

C. baking procedure utilizes a roasting plant to toast, and makes this high temperature resistant printing ink layer and high temperature heat-resistant reaction type hot-fusible glue-line be fused to the transfer surface that is subjected to of this transfer printing thing.

13., it is characterized in that this transfer printing thing is a sheet metal as making the hot transfer printing manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 12.

14., it is characterized in that this transfer printing thing is a glass plate as making the hot transfer printing manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 12.

15., it is characterized in that this transfer printing thing is a ceramic wafer as making the hot transfer printing manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 12.

16., it is characterized in that this baking procedure is to toast 5 minutes to 10 minutes with 150 ℃ to 250 ℃ as making the hot transfer printing manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 12.

17., it is characterized in that this heat transfer film is that the mode with package provides as making the hot transfer printing manufacturing process of large tracts of land, Continuous Heat transfer printing as described in the claim 12.

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