TWI581963B - Combined transfer printing film structure - Google Patents

Description

Compound transfer film

The present invention relates to a transfer film, and more particularly to a composite transfer film which can be used in an in-mold transfer process and a film biting process.

With the popularity of mobile phones and notebook computers, there is an increasing demand for the outer casing of mobile phones and the outer casing of notebook computers. For example, a shell with a colorful smooth surface is required to show fashion and special beauty in appearance and color. With the evolution of coating technology, In-Mold Decoration (IMD) is the current international surface decoration technology. In-mold decoration is mainly used for surface decoration and functional panels of home appliances, or panels for various fields such as mobile phone window lenses and housings, washing machine consoles, refrigerator consoles, air conditioning consoles, car dashboards and electric cooker consoles. , signs and other appearance items.

In the case of In-Mold Roller (IMR) in the field of IMD, most of them are used in the casing of mobile phones and notebook computers. In-mold transfer is to print the pattern on the film, and then bond the film to the mold cavity through the film feeder to perform injection molding. After the injection, the patterned ink layer is separated from the film, and the ink layer is left on the plastic part. Plastic parts with decorative patterns on the surface. The advantage of in-mold transfer is the high degree of automation in production and the low cost of mass production.

Furthermore, another imprint process is to use laser engraving to produce various three-dimensional patterns of different angles, lines, reflections, etc. on the mold, and then send the semi-finished products of the outer shell into the mold, and press the three-dimensional pattern designed by the mold. Printing semi-finished products to form a piece on the semi-finished product of the outer casing It has a three-dimensional film effect, and reflects the light through the three-dimensional lines to form a three-dimensional texture. If you want to change the pattern of the outer casing, you need to redesign the different molds. Due to the cost of redesigning the mold, the production cost of the product is greatly increased.

Therefore, how to design a transfer film, which can be applied in the in-mold decoration process, and at the same time has the functions of transfer and biting, has become a problem that the inventor of the present invention needs to solve.

In view of the above problems, the present invention provides a composite transfer film in order to solve the problem that the transfer and biting functions cannot be combined in the prior art.

A composite transfer film according to an embodiment of the invention includes a film, an in-mold bite structure and an in-mold transfer structure. Wherein, the in-mold biting structure covers the diaphragm, and the other mask in the film that is away from the diaphragm has a three-dimensional structural surface. The in-mold transfer structure has a hard coat layer. The hard coating layer is covered on the in-mold embossed structure and the three-dimensional structural surface is reproduced such that the hard coating layer forms a three-dimensional pattern surface corresponding to the three-dimensional structural surface.

A composite transfer film according to another embodiment of the present invention includes a film and an in-mold transfer structure. Among them, the in-mold transfer structure has a hard coat layer. The hard coating layer is covered on the film and the three-dimensional structure surface is reproduced so that the hard coating layer forms a three-dimensional pattern surface corresponding to the three-dimensional structure surface.

The effect of the present invention is that since the in-mold bite structure on the diaphragm is covered with the in-mold transfer structure, it is first used in an in-mold transfer (IMR) process with an in-mold transfer structure. When the in-mold transfer process is completed, the in-mold transfer structure is released from the in-mold bite structure. Therefore, the in-mold biting structure on the diaphragm can be used in the in-mold biting (IMT) process, and the in-mold biting structure can be reused, so that the composite transfer film of the present invention can be used simultaneously In-mold transfer (IMR) process and in-mold biting (IMT) process.

10‧‧‧ diaphragm

11‧‧‧Three-dimensional structure

20‧‧‧In-mold biting structure

21‧‧‧Three-dimensional structural layer

211‧‧‧Three-dimensional structural plane

22‧‧‧ release layer

221‧‧‧Three-dimensional structure

30‧‧•In-mold transfer structure

31‧‧‧hard coating

311‧‧‧ Appearance three-dimensional pattern surface

32‧‧‧Ink layer

33‧‧‧Adhesive layer

40‧‧‧Resin precursor

41‧‧‧Resin film

50‧‧‧Substrate

60‧‧‧ first mold base

70‧‧‧Second mold base

71‧‧‧ injection port

80‧‧‧ plastic

81‧‧‧Three-dimensional texture

Fig. 1 is a schematic view showing a composite transfer film according to a first embodiment of the present invention.

2A to 2F are schematic views showing a manufacturing process of the composite transfer film disclosed in the first embodiment of the present invention.

3A to 3B are schematic views showing the use of the composite transfer film disclosed in the first embodiment of the present invention for an in-mold transfer process (IMR).

4A to 4C are schematic views of a composite transfer film disclosed in the first embodiment of the present invention for use in an in-mold biting process (IMT).

Fig. 5 is a schematic view showing a composite transfer film according to a second embodiment of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic view of a composite transfer film according to a first embodiment of the present invention. The transfer film comprises a film 10, an in-mold bite structure 20 and an in-mold transfer structure 30.

The material of the diaphragm 10 is polyethylene terephthalate (PET), polycarbonate-glass fiber (PC-GF), polyamide-glass fiber (PA-GF), polycarbonate-acrylonitrile-butyl Diene-styrene copolymer (PC-ABS) or a combination thereof. The in-mold biting structure 20 has a three-dimensional structural layer 21 and a release layer 22. The in-mold transfer structure 30 has a hard coat layer 31, an ink layer 32, and an adhesive layer 33.

Please refer to FIG. 2A to FIG. 2F, which are schematic diagrams showing the manufacturing process of the composite transfer film according to the first embodiment of the present invention. Referring to FIG. 2A, a resin precursor 40 is applied to one side of the membrane 10 to cover the entire surface of the membrane 10 with the resin precursor 40. Coating The method is, for example, spin coating, slit coating, or blade coating. The material of the resin precursor 40 is an ultraviolet curing resin, and the resin precursor 40 includes, for example, an oligomer, a monomer, and a photoinitiator, and the oligomer is, for example, a ring. Epoxy acrylate, urethane acrylate, polyester acrylate, monomers such as vinyl monomers, propylene monomers, acryl acids, and photoinitiators For example, it is a radical generator of azobisisobutyronitrile (AIBN) or a cation generator of hydrochloric acid.

Then, referring to FIG. 2B, a resin film 41 is formed by irradiating the resin precursor 40 with ultraviolet light. In detail, when the resin precursor 40 is irradiated with ultraviolet light, the resin precursor 40 undergoes a chemical curing reaction to form the resin film 41. By controlling the intensity of the ultraviolet light, the irradiation time, and the wavelength, the curing degree of the resin film 41 can be controlled, and the ultraviolet light can enhance the structural strength of the resin film 41, and the resin film 41 can maintain the state of the fluid. plasticity. In the present embodiment, the degree of curing of the resin film 41 is 50%, but not limited thereto.

Next, referring to FIG. 2C, the resin film 41 is imprinted by an imprint mold (not shown), so that the resin film 41 is imprinted with a three-dimensional surface, and the three-dimensional surface is matched with the pattern of the imprint mold. design. However, the method of forming the resin film 41 into a three-dimensional surface is not limited to embossing. In other embodiments, a three-dimensional surface may be formed on the resin film 41 by, for example, etching. Then, referring to FIG. 2D, the resin film 41 is re-solidified, and a three-dimensional structure layer 21 is formed on the film 10, and a three-dimensional structural surface 211 is formed on one surface of the three-dimensional structure layer 21.

Next, referring to FIG. 2E, the release layer 22 is applied to the three-dimensional structural layer 21 by, for example, spin coating, slit coating, or blade coating. (blade coating). The material of the release layer 22 comprises a melamine and an epoxy resin, and the melamine is mixed with an epoxy resin and then ground. It should be noted that in this embodiment or other embodiments, the weight ratio of melamine to epoxy resin is between 5:5 and 7:3. In a preferred embodiment, the weight ratio of melamine to epoxy resin is 6:4. Since the release layer 22 appears to be liquid when applied, it has better fluidity, so that the release layer 22 can cover the three-dimensional structural surface 211. That is, after the release layer 22 is cured, the release layer 22 is also formed with a solid structure surface 221 according to the three-dimensional pattern or the three-dimensional texture of the three-dimensional structural surface 211.

Since the release layer 22 of the in-mold bite structure 20 is made of a mixture of melamine and epoxy resin. Wherein, the melamine material can make the in-mold biting structure 20 have a better release effect, that is, after the in-mold biting structure 20 is in contact with another substrate, the in-mold biting structure 20 is not easy to be combined with another substrate. Sticky and have good separation. On the other hand, the epoxy resin material can make the in-mold biting structure 20 have better heat resistance and structural strength, and the in-mold biting structure 20 has a better effect in scratch resistance and abrasion resistance. In this way, the in-mold biting structure 20 has better anti-scratch, anti-wear and the like effects in addition to high temperature resistance (for example, higher than 250 ° C).

Next, referring to FIG. 2F, the in-mold transfer structure 30 is overlaid on the in-mold bite structure 20. The hard coat layer 31 is first covered on the three-dimensional structure surface 221 such that the hard coat layer 31 matches the three-dimensional structure surface 221 to form an appearance three-dimensional pattern surface 311. That is to say, the appearance three-dimensional pattern surface 311 has the same three-dimensional appearance according to the three-dimensional pattern or the three-dimensional texture of the three-dimensional structure surface 221. Next, the ink layer 32 is applied onto the hard coat layer 31, and the adhesive layer 33 is formed on the ink layer 32 so that the ink layer 32 is positioned between the adhesive layer 33 and the hard coat layer 31.

Therefore, the composite transfer film of the present invention has both the in-mold bite structure 20 and the in-mold transfer structure 30, so that the composite transfer film can be separately used for the IMR process (in-mold transfer process) and the IMT process ( In-film biting process).

Referring to FIGS. 3A to 3B, there is shown a schematic diagram of a composite transfer film disclosed in the first embodiment of the present invention for use in an in-mold transfer process (IMR). When the IMR process (in-mold transfer process) is performed, the adhesive layer of the in-mold transfer structure 30 can be bonded to a substrate 50. The demolding process is further performed to separate the hard coat layer from the solid structural surface 221 . Thus, the appearance of the hard coat layer 31, the three-dimensional pattern surface 311, can be the appearance surface of the substrate 50. Additionally, ink layer 32 can provide a pattern and color of the appearance of substrate 50. In addition, the hard coat layer 31 of the present embodiment may further add a pigment to make the hard coat layer 31 have a color, and may replace the arrangement of the ink layer 32, and the pigment is used to enhance the visual three-dimensional effect of the hard coat layer 31.

Referring to FIGS. 4A to 4C, there is shown a schematic diagram of a composite transfer film disclosed in the first embodiment of the present invention for use in an in-mold biting process (IMT). When the IMR process (in-mold transfer process) is completed, the in-mold transfer structure 30 can be separated from the in-mold bite structure 20, and thus, the IMT process (in-film biting process) can be performed. First, a first mold base 60 and a second mold base 70 are matched by each other. The diaphragm 10 having the in-mold occlusal structure 20 is placed on the first mold base 60, and the three-dimensional structural surface 211 of the release layer 22 of the in-mold occlusal structure 20 faces the second mold base 70. Next, a liquid plastic 80 is injected into the injection port 71 to form the plastic 80 on the in-mold biting structure 20. In this or other embodiments, plastic 80 is formed on the release layer 22 of the in-mold bite structure 20 by injection molding. In this embodiment, the plastic 80 can be, but not limited to, a thermoplastic or a thermoset plastic. Thermoplastic plastics such as polyethylene, polypropylene or polyvinyl chloride have heat-softening, cooling and hardening properties and can be molded multiple times. The plastic, and the thermosetting plastic is, for example, an epoxy resin or a urea formaldehyde resin, which can be molded only once.

By leaving the release layer 22 with the material properties of melamine and epoxy resin, the release layer 22 can withstand the high temperature of the liquid plastic 80 through the epoxy resin characteristics, and the liquid plastic 80 It is completely filled on the three-dimensional structural surface 211, followed by curing of the liquid plastic 7. Finally, the plastic 80 is separated from the three-dimensional structural face 211 of the release layer 22. Due to the melamine properties of the release layer 22, a good release effect between the plastic 80 and the release layer 22 is achieved. In this way, the solidified plastic 80 is shaped to have a three-dimensional structure of the three-dimensional texture 81 on the surface after being released. For example, the user designs various three-dimensional structural faces 211 such that the three-dimensional texture 81 of the plastic 80 can have various line density patterns or texture patterns, thereby producing different visual effects.

Referring to FIG. 5, FIG. 5 is a schematic view of a composite transfer film according to a second embodiment of the present invention. The transfer film includes a diaphragm 10 and an in-mold transfer structure 30. Among them, a three-dimensional structural surface 11 is formed on one surface of the diaphragm 10 by imprinting, etching or laser engraving. Next, the in-mold transfer structure 30 is overlaid on the diaphragm 10. The hard coat layer 31 is first covered on the three-dimensional structure surface 11 such that the hard coat layer 31 matches the three-dimensional structure surface 11 to form an appearance three-dimensional pattern surface 311. That is to say, the appearance three-dimensional pattern surface 311 has the same three-dimensional appearance according to the three-dimensional pattern or the three-dimensional texture of the three-dimensional structural surface 11. Next, the ink layer 32 is applied onto the hard coat layer 31, and the adhesive layer 33 is formed on the ink layer 32 so that the ink layer 32 is positioned between the adhesive layer 33 and the hard coat layer 31. In this way, the in-mold transfer structure 30 on the diaphragm 10 can be used in an IMR process (in-mold transfer process), and the three-dimensional structure face 11 of the film 10 itself can be used in an IMT process (in-film biting process).

According to the composite transfer film disclosed in the above embodiments of the present invention, since the transfer film includes the in-mold transfer structure and the in-mold bite structure, the composite transfer film of the present invention can simultaneously It is used in in-mold transfer (IMR) process and in-mold biting (IMT) process to produce stereoscopic three-dimensional patterns.

10‧‧‧ diaphragm

20‧‧‧In-mold biting structure

21‧‧‧Three-dimensional structural layer

22‧‧‧ release layer

30‧‧•In-mold transfer structure

31‧‧‧hard coating

32‧‧‧Ink layer

33‧‧‧Adhesive layer

Claims (5)

A composite transfer film comprising: a film; and an in-mold biting structure covering the film, the in-mold biting structure further comprises a three-dimensional structural layer and a release layer, the three-dimensional structural layer Curing and molding on the film, one side of the three-dimensional structural layer is attached to the film, and the other side is formed with a three-dimensional structural surface, and the release layer is coated on the three-dimensional structural layer, and the release layer is formed according to the three-dimensional structure Forming the three-dimensional structural surface; and an in-mold transfer structure having a hard coat layer, an adhesive layer and an ink layer, the hard coat layer covering the in-mold bite structure and replicating the three-dimensional structure surface The hard coating layer is formed to correspond to the three-dimensional structure surface to form an outer three-dimensional pattern surface, the adhesive layer is disposed on the other side of the hard coating layer away from the appearance of the three-dimensional pattern surface, and the ink layer is disposed on the hard coating layer and the Between the adhesive layers; wherein, when the composite transfer film is first used in an in-mold transfer (IMR) process with the in-mold transfer structure, the in-mold transfer structure is bonded to a substrate with the adhesive layer a surface and the hard coating layer of the in-mold transfer structure The release layer of the inner biting structure is separated from each other, so that the film and the in-mold biting structure can be removed from the in-mold transfer structure, and then the composite transfer film is bitten by the in-mold. The structure can be reused for an in-mold bite (IMT) process in which the in-mold bite structure is replicated on a solidified plastic surface with the release layer. The composite transfer film according to claim 1, wherein the material of the release layer comprises a melamine and an epoxy resin, and the weight ratio of the melamine to the epoxy resin is between 5:5 and 7. : between 3. The composite transfer film according to claim 1, further comprising at least one pigment which is filled in the hard coat layer. A composite transfer film comprising: a diaphragm having a three-dimensional structural surface; and an in-mold transfer structure having a hard coat layer, an adhesive layer and an ink layer overlying the film and replicating the three-dimensional structure a surface of the hard coating corresponding to the three-dimensional structure surface to form an external three-dimensional pattern surface, the adhesive layer is disposed on the other side of the hard coating layer away from the appearance of the three-dimensional pattern surface, the ink layer is disposed on the hard coating layer and the Between the adhesive layers; wherein, when the composite transfer film is first used in an in-mold transfer (IMR) process with the in-mold transfer structure, the in-mold transfer structure is bonded to a substrate with the adhesive layer a surface, and separating the hard coating layer of the in-mold transfer structure from the three-dimensional structural surface of the film, so that the film can be removed from the in-mold transfer structure, and then the composite transfer The film is then reusable in an in-mold bite (IMT) process in which the film is replicated on a solidified plastic surface. The composite transfer film of claim 4, further comprising at least one pigment, is filled in the hard coat layer.