CN201044988Y - Heat transfer film capable of large-area continuous heat transfer printing - Google Patents

Abstract

A heat transfer film for large-area continuous heat transfer is used to directly form single-color or color print on the surface of various non-ink-absorbing articles such as metal, glass or ceramic. The layer structure comprises: the ink comprises a reelable continuous base material with a release layer on the surface, one or more high-temperature-resistant pigment ink layers printed on the surface of the continuous base material by a printer, and a high-temperature-resistant heat-reactive hot melt adhesive layer coated on the surface of the high-temperature-resistant pigment ink layer. When the high-temperature-resistant pigment ink layer is used, the high-temperature-resistant pigment ink layer is temporarily fixed on various metal, glass or ceramic transfer-receiving surfaces in a segmented, continuous or large-area mode through a thermal transfer printing device, then the high-temperature-resistant heat-reactive hot-melt adhesive layer reaches the temperature for generating viscosity by baking, infrared irradiation or high-temperature heating equipment, and the high-temperature-resistant pigment ink layer is firmly fixed on the transfer-receiving surfaces, so that an effect similar to direct printing is generated after solidification.

Description

Thermal transfer film that can be used for large-area, continuous thermal transfer

technical field

The utility model relates to a thermal transfer film which can be used for large-area and continuous thermal transfer printing, and particularly refers to a continuous base material which can be rolled up and contains a release layer on the surface, on which the high temperature resistant pigment ink is printed. And apply high-temperature-resistant heat-reactive hot-melt adhesive, so that the high-temperature-resistant pigment ink can be falsely fixed on the transfer surface, and then use high temperature to make the hot-melt adhesive viscous, and fix the high-temperature resistant pigment ink on the transfer surface.

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.

Compared with the present invention, several printing methods known at present are suitable for printing on the surface of general paper or flat single-piece tinplate sheets, but not suitable for roll-packed, super-long, and block-shaped ones. Or printing on the surface of a metal sheet with a curved surface or on the surface of other strip-shaped items.

Although screen printing can be directly printed on a metal surface with a curved surface, it is 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 fineness of the printed pattern is poor and the dots are large, which is usually only suitable for long-distance 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 (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 slight gap between the thermal transfer paper and the transfer surface, the image resolution at this place will immediately be noticeably abnormal, and it will 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, thermal transfer printing is applied to non-ink-absorbing surfaces such as metal, glass, and ceramics, and 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, etc. are acceptable, but if it is to be applied to large-scale building materials, such as the transfer printing of colored corrugated boards, large glass plates or entire tiles, etc. , technical breakthroughs are still to be made.

Contents of the invention

The technical problem to be solved by the utility model is to provide a rollable, continuous and large-area thermal transfer film, which is used to form monochromatic printing directly on the surface of non-ink-absorbing items such as various metals, glass or ceramics. Or the printing effect of color, it is to break through the limitation of aforementioned various known technologies.

In order to solve the above technical problems, the utility model proposes a thermal transfer film that can be used for large-area, continuous thermal transfer, which includes:

A rollable continuous substrate with a release layer on its surface, comprising a continuous substrate and a release 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 is connected to the high-temperature-resistant ink layer.

Preferably, the rollable continuous substrate having a release layer on its surface is a release liner.

Preferably, the rollable continuous substrate having a release layer on its surface is a PET release film.

Preferably, the high-temperature resistant heat-reactive hot-melt adhesive layer does not start to become sticky until the temperature ranges from 150°C to 250°C.

Preferably, the high temperature-resistant ink layer can maintain its original color substantially after being heated at 150°C to 250°C.

Preferably, the high temperature resistant ink layer uses a printing device to print a high temperature resistant ink on the surface of the release agent coating.

Preferably, a high temperature resistant transparent adhesive layer is still connected between the high temperature resistant ink layer and the release agent coating.

Preferably, the high temperature resistant transparent adhesive layer is formed by a transparent UV adhesive or a high temperature resistant heat reactive transparent adhesive.

Preferably, the high temperature resistant ink layer is printed with a high temperature resistant ink on the surface of the high temperature resistant transparent adhesive layer by a printing device.

Therefore, the thermal transfer film of the present invention has the following characteristics and advantages:

Its film structure includes: a rollable continuous substrate with a release layer on the surface, one or more layers of high-temperature resistant pigment ink layer formed on the surface of the continuous substrate by printing with a printing machine, and a layer coated on A high temperature resistant heat reactive hot melt adhesive layer on the surface of the high temperature resistant pigment ink layer. When in use, the high-temperature-resistant pigment ink layer is fixed to various metal, glass or ceramic transfer surfaces in sections, continuously or in a large area through a thermal transfer equipment, and then baked, infrared ray irradiation or high-temperature heating equipment is used. The high-temperature-resistant heat-reactive hot-melt adhesive layer thus reaches the viscosity-generating temperature, and the high-temperature-resistant pigment ink layer is firmly fixed on the transfer surface, thereby producing an effect similar to direct printing after solidification.

Description of drawings

It is a schematic diagram of an embodiment of the thermal transfer film and the manufacturing process of the thermal transfer film of the present utility model.

Fig. 2 is a schematic diagram of a thermal transfer film of the present invention and a variation embodiment of the manufacturing process 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: Rollable continuous substrate with a release layer on the surface

2: Printing equipment 3: Coating equipment

10: Continuous substrate 11: Release agent coating

12: Heating 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: Heating equipment

150: high temperature resistant transparent adhesive layer

Detailed ways

As shown in Figure 1, the structure of the thermal transfer film 40 of the present utility model and the schematic diagram of the embodiment of the manufacturing process steps include:

1. The preparation step is to prepare a rollable continuous substrate 1 whose surface contains a release layer, so that it contains at least a continuous substrate 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 11; 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 continuous substrate 1 containing the release agent coating described in step 1 can be a release paper or a PET release film, which is provided in rolls for printing in step 2.

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 prevent the high-temperature-resistant ink layer 20 of thermal transfer from changing color after high-temperature baking; the high-temperature-resistant ink can be selected to maintain its original color after being heated at 150°C to 250°C. The color of the transfer printing product can last for a long time even 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 high-molecular heat-reactive polymer hot-melt adhesive that becomes viscous only in the range of 150°C to 250°C. The purpose of selecting high-temperature-resistant heat-reactive hot-melt adhesive is to make the hot-melt adhesive produce viscosity in a high-temperature state and fix the high-temperature-resistant ink layer 20 on the surface of the article, so that the printing effect of the high-temperature-resistant ink layer 20 can be maintained at room temperature. Maintain stable physical properties and strength.

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

1. The preparation step is to prepare a rollable continuous substrate 1 whose surface contains a release layer, so that it contains a continuous substrate 10 and a release agent coating 11;

2. Coating step, using a coating device 15 to apply a high temperature resistant transparent adhesive to the surface of the release agent coating 11, and then using a heating 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 large area, unlimited length and protective layer can be mass-produced quickly. The so-called protective layer is formed by 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 utility model can be used in rolls, and the thermal transfer steps are shown in the embodiment of 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 blank film 41 (the continuous substrate 10 and the release agent layer 11 ) after the transfer is simultaneously wound up and recovered. Thus, thermal transfer printing can be performed on the surface of a continuous, unlimited-length transfer material 60 such as metal, glass or ceramics, 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. Heating step, using a heating device 70 to heat 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 object 60 Print the table to form a finished product 61 with good adhesion, firmness, good weather resistance, beautiful appearance and wear resistance. The heating device 70 can be a general industrial oven, an infrared heating irradiation device or other heating devices. 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 provided by the utility model has the following advantages:

1. Using the thermal transfer film of the present utility model, the non-ink-absorbing surfaces of metal, glass and ceramics can be directly thermally transferred without powder coating or baking paint, and then baked or otherwise heated after thermal transfer , can make high temperature resistant ink and high temperature resistant hot melt adhesive together form a hard film layer, firmly combined with the transfer surface, resulting in the advantages of wear resistance, weather resistance and bending resistance.

2. The traditional thermal transfer film and transfer operation only focus on the manual operation and small-area transfer operation, but the thermal transfer film and manufacturing process of the utility model can revolutionize the large-area metal sheet in the roll. It is impossible for any known technology to produce a protective layer with exquisite printing and unlimited length on its surface for transfer printing.

3. The scope of application of the utility model can be applied to heat transfer printing on the surface of various metal plates, strips, 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 utility model, but the embodiment is not intended to limit the patent scope of the utility model, and any equivalent implementation or modification that does not depart from the technical spirit of the utility model All actions should be included in the patent scope of this case.

Claims (9)

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

But the continuity base material from the package of shape layer is contained on a surface, contains a continuity base material and a mould release coating;

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

One high temperature heat-resistant reaction type hot-fusible glue-line is connected in 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, but the continuity base material that this surface is contained from the package of shape layer 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, but the continuity base material that this surface is contained from the package of shape layer 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, this high temperature heat-resistant reaction type hot-fusible glue-line is the high temperature heat-resistant reaction type hot-fusible glue-line that just begins to produce stickiness 150 ℃～250 ℃ scopes.

5. can make the heat transfer film of large tracts of land, Continuous Heat transfer printing according to claim 1, it is characterized in that, this is high temperature resistant, and the printing ink layer is through still generally keeping its high temperature resistant printing ink layer of color originally after 150 ℃～250 ℃ the heating.

6. can make the heat transfer film of large tracts of land, Continuous Heat transfer printing according to claim 1, it is characterized in that, this is high temperature resistant printing ink layer a utilizes printing equipment with an oil resistant ink print in this mould release coating surface.

7. 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.

8. as making the heat transfer film of large tracts of land, Continuous Heat transfer printing as described in the claim 7, 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.

9. as making the heat transfer film of large tracts of land, Continuous Heat transfer printing as described in the claim 7, it is characterized in that, this is high temperature resistant printing ink layer by a printing equipment with an oil resistant ink print in the surface of this thermostable transparent glue-line.

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