In-mold transfer printing membrane capable of positioning multiple glossiness and preparation method and application of in-mold transfer printing membrane

Abstract

The invention relates to a positioning multi-glossiness in-mold transfer printing membrane and a preparation method and application thereof.The membrane comprises a base membrane, a hardened layer, a connecting layer, an ink combination layer and an adhesive layer are laminated on one side of the base membrane, and a bright glossy surface and a matte glossy surface are arranged on the hardened layer after membrane in-mold transfer printing; the bright glossy surface is formed by a bright release layer before in-mold transfer printing or a UV layer after in-mold transfer printing, and the matte glossy surface is formed by a matte release layer before in-mold transfer printing, convex-concave textures of a UV mold pressing layer before in-mold transfer printing or convex-concave textures in a mold core during in-mold transfer printing. Compared with the prior art, the artificial leather has rich layering sense and texture, and decorative effects with different glossiness at specific positions are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-mold transfer printing, and relates to an in-mold transfer printing film sheet for positioning multiple gloss levels, a preparation method thereof, and an application thereof. Background Art

[0002] In-mold transfer printing (IMR) technology is a surface decoration technology that is green, environmentally friendly, simple in process, and remarkable in decoration effect. It can endow molded parts with many elements such as patterns, textures, logos, gradients, and hidden windows at the same time. Currently, it has been applied to many industries such as home appliances, consumer electronics, and automotive interiors. However, the surface gloss levels of various in-mold transfer printed molded parts on the market are single, that is, the same product can only achieve a bright or matte effect, and it is impossible to have two or more gloss levels at the same time, so the decoration effect is not obvious.

[0003] Patent CN101920607A discloses a local UV printing process on the surface of a metal ink. The process includes the following steps: adding styrene-acrylic polymer, modified silica-polyethylene wax copolymer, and self-crosslinking emulsion to the UV base oil, reacting at -10 to 30 °C to obtain a modified UV base oil with a matte gloss; after applying a layer of metal ink on the object to be printed, then coating the above-mentioned modified UV base oil, drying by infrared irradiation, and then performing local UV varnish coating by screen printing, and then drying by irradiation with UV light to obtain the product, and the product can selectively present a bright gloss and a matte gloss. However, this patent is not applicable to in-mold transfer printing technology and does not have the advantages of simple process and remarkable decoration effect corresponding to in-mold transfer printing.

[0004] Patent CN1546320A discloses a production method of a transfer film with a matte and a bright surface and its product. The production method of the transfer film is to first evenly coat or print a release layer on the carrier film, and then use a printing machine to first print a matte material layer on at least one area of the release layer, and then print a bright material layer on the area where the matte material layer is not printed, and then correspondingly print a decorative layer and an adhesive layer; the transfer film obtained by the production method includes a carrier film, a release layer, a decorative layer, and an adhesive layer, and the decorative layer includes a protective layer, and at least one area of the protective layer presents a matte finish, and at least one area presents a bright finish. However, this patent cannot well achieve the combination of bright and matte of the product, because whether the object shows a bright or matte finish is determined by the surface roughness of the product. After the transfer of this patent is completed, the surface roughness of the product is the same as that of the release layer, and there is no difference in the roughness of the release layer. Therefore, it can be expected that the difference between the matte and bright surfaces of the product is not significant. Summary of the Invention

[0005] The object of the present invention is to overcome at least one defect of the above-mentioned prior art, and to provide an in-mold transfer film sheet for positioning multiple gloss levels, its preparation method and application. The present invention has a rich sense of hierarchy, texture and decorative effects with different gloss levels at specific positions.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] One of the technical solutions of the present invention is to provide an in-mold transfer film sheet for positioning multiple gloss levels. The film sheet includes a base film, and a hardening layer, a connection layer, an ink combination layer, and an adhesive layer are laminated on one side of the base film. After in-mold transfer of the film sheet, a bright gloss surface and a matte gloss surface are provided on the hardening layer. The bright gloss surface is formed by a bright release layer before in-mold transfer or a UV layer after in-mold transfer, and the matte gloss surface is formed by a matte release layer before in-mold transfer, the concave-convex texture of the UV embossing layer before in-mold transfer, or the concave-convex texture in the mold core of the mold during in-mold transfer.

[0008] Further, the bright gloss surface is formed by a bright release layer before in-mold transfer, the matte gloss surface is formed by a matte release layer before in-mold transfer. The bright release layer is coated in a full version, and the matte release layer is coated in a positioned and partial manner, and the area can be designed in cooperation with the printing effect, and / or

[0009] The bright gloss surface is formed by a bright release layer before in-mold transfer, the matte gloss surface is formed by the concave-convex texture of the UV embossing layer before in-mold transfer. The bright release layer is coated in a full version, and the processing method of the UV embossing layer adopts an embossing process. While coating the UV material, it is positioned and partially embossed into a texture structure on its surface, and then immediately subjected to ultraviolet light curing. The texture structure is a shape with a set regular concave-convex depth on the surface, combined with a smooth texture, to achieve different gloss levels, and / or

[0010] The bright gloss surface is formed by a UV layer after in-mold transfer, the matte gloss surface is formed by a matte release layer before in-mold transfer. The matte release layer is coated in a full version. After completing the in-mold transfer, a UV layer is provided on the hardening layer. Under the shielding of a film negative, UV material is positioned and partially sprayed, and then immediately subjected to ultraviolet light curing to form a UV layer with a bright effect, and / or

[0011] The bright gloss surface is formed by a bright release layer before in-mold transfer, the matte gloss surface is formed by the concave-convex texture in the mold core of the mold during in-mold transfer. The bright release layer is coated in a full version. By locally engraving different concave-convex textures on the mold cavity, a smooth cavity and a textured cavity are formed in the mold core. After completing the in-mold transfer, the product at the position with the concave-convex texture forms diffuse reflection due to the uneven surface, showing a matte effect, while other areas are relatively flat, showing a bright effect.

[0012] The base film mainly serves as a transfer carrier in the in-mold transfer film. All subsequent coatings are processed on the base film. After the transfer is completed, the base film is immediately scrapped.

[0013] As a preferred technical solution, the material of the base film is selected from one or more thermoplastic materials such as polypropylene (PP) resin, polyethylene (PE) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, polycarbonate (PC) resin, and polyethylene terephthalate (PET) resin.

[0014] As a preferred technical solution, during the selection process, a base film with high flatness, low haze, and high stretchability should be selected as much as possible, which helps to improve the yield of the product.

[0015] As a preferred technical solution, the thickness of the base film is 20 - 200 μm.

[0016] As a more preferred technical solution, considering the stretchability and supportability, the thickness of the base film is 45 - 80 μm.

[0017] The bright release layer and the matte release layer are layers provided to satisfy the transfer function of the pattern and at the same time endow the transferred product with different gloss degrees.

[0018] Further, a bright release layer and a matte release layer are sequentially provided between the base film and the hardening layer. The base materials of the bright release layer and the matte release layer are both selected from one or more of epoxy resin, fluororesin, silicone resin, and solvent wax. The processing method is both by coating process. The thickness of the bright release layer is 0.5 - 3 μm, and the thickness of the matte release layer is 1 - 4 μm;

[0019] The matte release layer contains matte powder, and the material of the matte powder is selected from one or more organic particles such as silica, silicate, zinc stearate, and talcum powder, with a particle size of 0.1 - 3.5 μm;

[0020] By adjusting the content and particle size of the matte powder, the surface roughness formed on the matte release layer can be adjusted, so as to achieve the expected gloss degree of the product. The surface roughness of the matte release layer is 0.3 - 3 μm, and the gloss degree is 8 - 70 GU;

[0021] The surface roughness of the bright release layer is 0.1 - 0.5 μm, and the gloss degree ≥ 90 GU.

[0022] Because the materials of the bright release layer and the matte release layer are similar, the adhesion between them and with the base film is good. During the injection molding process of in-mold transfer, the bright release layer, the matte release layer and the base film are peeled off together to complete the transfer.

[0023] The granular matte powder is evenly dispersed in the matte release layer. After coating, some particles adhere to the surface, forming a granular concave-convex feeling, and this concave-convex feeling will form diffuse reflection, that is, the so-called matte effect.

[0024] On the contrary, there are no such particles in the bright release layer. The concave-convex feeling of the base material of the bright release layer itself is very weak, and the surface is relatively flat, thus forming a bright effect.

[0025] As a preferred technical solution, generally speaking, the matte gloss range can be adjusted, and molded parts with various different gloss combinations can be made. However, for obvious comparison, it is recommended that the gloss difference between the matte release layer and the bright release layer is greater than 30 GU.

[0026] Furthermore, when the matte release layer is provided with two layers, namely the first matte release layer and the second matte release layer, the first matte release layer and the second matte release layer are sequentially arranged between the bright release layer and the hardening layer. The thickness of the first matte release layer is 1-4 μm, and the thickness of the second matte release layer is 1-4 μm;

[0027] The first matte release layer contains first matte powder, and the material of the first matte powder is selected from one or more organic particles of silica, silicate, zinc stearate, talcum powder, etc., and the particle size is 0.1-3 μm;

[0028] The second matte release layer contains second matte powder, and the material of the second matte powder is selected from one or more organic particles of silica, silicate, zinc stearate, talcum powder, etc., and the particle size is 0.5-3.5 μm;

[0029] The surface roughness of the first matte release layer is 0.3-3 μm, and the gloss is 10-70 GU;

[0030] The surface roughness of the second matte release layer is 0.6-3.5 μm, and the gloss is 8-40 GU.

[0031] The second matte powder contained in the second matte release layer has larger particles, forming a higher roughness on the surface of the second matte release layer, and the gloss of the final product is smaller.

[0032] The coating area of the second matte release layer should be smaller than that of the first matte release layer, forming a more matte effect in the coating area of the partial matte effect.

[0033] It is worth noting that the coating order of the first matte release layer and the second matte release layer cannot be reversed. This is because the particle convex and concave texture formed by the second matte release layer is deeper, and the first matte release layer may not be able to fill the particle convex and concave texture of the second matte release layer after the coating order is reversed, resulting in the glossiness of the first matte release layer failing to meet expectations.

[0034] After completing the in-mold transfer, the surface of the final product forms three different gloss levels: a glossy surface with a glossy effect, a first matte glossy surface with a matte effect, and a second matte glossy surface with a more matte effect, which further enhances the layering and texture of the product.

[0035] Furthermore, a UV molded layer and a glossy release layer are sequentially arranged between the base film and the hardening layer. The material of the UV molded layer is selected from one or more UV materials of epoxy acrylate, polyester acrylate, and polymethacrylic acid. The depth of the convex and concave texture on the plate roller can be adjusted according to the expected glossiness. The surface roughness of the convex and concave texture of the UV molded layer is 2-30 μm, and the glossiness is 10-70 GU. The surface roughness of the smooth texture is 0.1-2 μm, and the glossiness is ≥90 GU. Considering the depth of the convex and concave grooves, the thickness of the UV molded layer is 3-35 μm, and / or

[0036] A matte release layer is provided between the base film and the hardening layer. After the in-mold transfer is completed, the product as a whole presents a matte effect. The material of the UV layer is selected from one or more UV materials of epoxy acrylate, polyester acrylate, and polymethacrylate. The thickness of the UV layer is 5-20 μm, the surface roughness is 0.1-0.5 μm, and the glossiness is ≥90GU, and / or

[0037] A glossy release layer is provided between the base film and the hardening layer. The texture depth of the convex-concave texture of the texture cavity is 7-25 μm, and the glossiness is 10-70 GU.

[0038] It is worth noting that the thickness of the glossy release layer is very small, far lower than the depth of the convex and concave texture, and does not fill the convex and concave texture. Therefore, after in-mold transfer, the convex and concave texture will also be transferred to the product, forming different gloss levels, namely the glossy surface and the first matte glossy surface.

[0039] On the one hand, the function of the UV layer is the same as that of the hardening layer, which plays a role in protecting the pattern; on the other hand, the convex and concave textures of the molded part that present a matte effect in the hollowed-out area of the film will be filled by the UV layer, forming a glossy effect, while the part blocked by the film, that is, the non-hollowed-out area, will not have the UV layer, retaining the original matte effect, forming two gloss levels as a whole, namely the UV glossy surface and the matte glossy surface.

[0040] The hardening layer is designed to give the final molded part hardness, wear resistance and other resistance properties. It is placed on the surface of the molded part and can well protect the pattern from being scratched and damaged.

[0041] After the transfer is completed, the surfaces of the glossy release layer and the matte release layer can be completely replicated on the hardened layer to form corresponding texture convex and concave, and placed on the product surface. Therefore, the final product has the same surface roughness as the release layer, forming two different gloss levels, namely glossy surface and matte glossy surface.

[0042] The connecting layer is used to improve the adhesion between the hardening layer and the ink combination layer. It has excellent flexibility and impact resistance, can form a strong connection between the hardening layer and the ink combination layer, and can also adapt to the thermal expansion differences between different materials to prevent cracking or falling off during subsequent use.

[0043] The ink combination layer is a layer designed to give the product an excellent decorative effect and is the key to highlighting the product's appearance elements such as color, pattern, window, logo, etc.

[0044] The adhesive layer is a layer provided for tightly bonding the ink combination layer and the resin layer.

[0045] Furthermore, the material of the hardened layer is selected from one or more of polyacrylate, polyurethane, and isocyanate, taking into account flexibility and hardness, and can reach a pencil hardness of 1H. The processing method adopts a coating process, and is processed according to the selected material with ultraviolet light curing, with a thickness of 5-20 μm.

[0046] The material of the connecting layer is selected from one or more of polyurethane and polycarbonate, and the processing method adopts a coating process, with a thickness of 1-15 μm;

[0047] The ink combination layer includes ink, metal powder, diluent and curing agent, which are selected according to the design pattern. The material of the metal powder is selected from one or more of silver powder, aluminum powder, pearl powder and matte powder to highlight the metallic texture. The ink combination layer is processed by screen printing, gravure printing, offset printing, or vacuum magnetron sputtering to form a metal film layer with a thickness of 5-100 μm, which is determined by the design pattern and the number of printing times.

[0048] The adhesive layer is made of one or more hot melt adhesives selected from polyacrylate, polycarbonate, and ethylene-vinyl acetate copolymer (EVA), and is processed by coating or printing, with a thickness of 3-20 μm.

[0049] Furthermore, a positioning ink layer is provided in the ink combination layer, and the positioning ink layer is printed on the position corresponding to the bright glossy surface using a precise positioning printing process, that is, the printing area of the positioning ink layer and the bright area are precisely overlapped to form a combination of color and glossiness, giving the product a rich sense of layering and texture.

[0050] Furthermore, the base film is laminated with an antistatic layer on the other side of the laminated hardened layer. The material of the antistatic layer is selected from one or more of inorganic antistatic agents, polymer conductive compositions, quaternary ammonium salt antistatic agents, and polyether antistatic agents. The processing method adopts a coating process and the thickness is 0.1-3μm.

[0051] The antistatic layer is mainly used to eliminate static electricity generated during the processing of the diaphragm, thereby reducing the absorption of dust and other foreign particles by the diaphragm and improving the cleanliness of the diaphragm.

[0052] One of the technical solutions of the present invention is to provide a method for preparing the in-mold transfer film with multiple gloss levels, the method comprising the following steps:

[0053] S1. Preparation of in-mold transfer release films with various gloss levels.

[0054] S11, applying a release layer on one side of the base film;

[0055] S12, coating the release layer with UV material and curing it with ultraviolet light to form a hardened layer;

[0056] S13, coating a connecting layer on the hardened layer to obtain an in-mold transfer release film with various gloss levels;

[0057] S2, preparation of in-mold transfer films with various gloss levels,

[0058] S21, processing an ink combination layer on the connecting layer of the release film;

[0059] S22, coating an adhesive layer on the ink combination layer;

[0060] S23: The film is fully matured to obtain an in-mold transfer film with various gloss levels.

[0061] As a preferred technical solution, in step S11 , an antistatic layer is first coated on one side of the base film, and then a release layer is coated on the other side of the base film.

[0062] As a preferred technical solution, in step S11, a glossy release layer is first coated on the other side of the base film, and then a matte release layer is coated on the glossy release layer using a micro-concave coating process, with the matte release layer only coated on a partial area.

[0063] As a preferred technical solution, in step S11, a glossy release layer is first coated on the other side of the base film, and then a first matte release layer is coated on the glossy release layer, and the first matte release layer is only coated on a partial area. Then, a second matte release layer is coated on the first matte release layer, and the second matte release layer is only coated on a smaller partial area.

[0064] As a preferred technical solution, in step S11, UV material is first coated on the other side of the base film, and a convex and concave texture is molded on part of the surface area. Then, ultraviolet light is immediately used to complete the curing to form a UV molded layer, and then a glossy release layer is coated on the UV molded layer.

[0065] As a preferred technical solution, in step S11, a matte release layer is coated on the other side of the base film. When preparing the molded part, a film is designed, the film is attached to the surface of the hardened layer, UV material is sprayed, and ultraviolet light is used to complete the curing to form a UV layer.

[0066] As a preferred technical solution, in step S11, a glossy release layer is coated on the other side of the base film. When the molded part is prepared, a convex and concave texture is provided in the mold core of the mold by in-mold transfer.

[0067] As a preferred technical solution, in step S21 , a registration ink layer is first printed on the bright area of the connecting layer to form a separate color, and then the ink combination layer is processed.

[0068] As a preferred technical solution, the aging temperature in step S23 is 40-80° C. and the aging time is 24-96 hours.

[0069] One of the technical solutions of the present invention is to provide an application of the in-mold transfer film for positioning multiple gloss levels, wherein the film is used for positioning in-mold transfer molded parts with multiple gloss levels, and a processing method of in-mold transfer technology is used to transfer part of the coating of the in-mold transfer film to the resin layer. During the injection molding of the in-mold transfer, the base film and the discarded film are peeled off, and the remaining coating of the in-mold transfer film is tightly connected to the resin layer through the adhesive layer, and the formed bright glossy surface and matte glossy surface are placed on the surface of the molded part to obtain a molded part product.

[0070] The resin layer is the main body of the in-mold transfer molded part. In conjunction with the in-mold transfer process, part of the coating of the membrane is transferred to the molded part, and the resulting product has rich decorative effects and different gloss effects.

[0071] As a preferred technical solution, the resin layer can be made of different materials according to the purpose, and the material is selected from one or more thermoplastic materials selected from polypropylene resin, polyethylene resin, acrylonitrile-butadiene-styrene copolymer resin, polycarbonate resin, and polyethylene terephthalate resin.

[0072] As a preferred technical solution, the resin layer is processed by an injection molding process. Depending on different product designs, the thickness of the resin layer is 2 - 10 mm, which is much larger than the thickness of all coatings by comparison.

[0073] Compared with the prior art, the present invention has the following beneficial effects:

[0074] (1) Through optional improvements in two directions of the diaphragm and the mold, the molded products of the present invention can exhibit different gloss levels. And in combination with register printing, the products have rich layering and texture, greatly improving the decorative effect of the products; it can enrich the in-mold transfer product series and achieve various decorative effects of in-mold transfer products, such as the overall effect is matte, but the logo, font, window, etc. are bright effects; or the overall is bright and the local has a matte effect with a frosted texture;

[0075] (2) The present invention proposes a variety of process means to achieve the combination of bright gloss surfaces and matte gloss surfaces, such as the local matte gloss surface contrasts with the overall bright gloss surface, or the local bright gloss surface contrasts with the overall matte gloss surface, forming multi-gloss effects between different parts;

[0076] (3) The present invention proposes a variety of innovative process technologies to achieve multi-gloss effects, including the particle method of adding matte powder, the UV embossing method, and the transfer texture method using the mold core texture to form a locally positioned matte gloss surface, or the masking spraying method to form a locally positioned bright gloss surface; each method has its unique principle and advantages. For example, the matte effect of multiple levels can be obtained by controlling the matte powder content and particle size in addition to the bright effect by adding matte powder particles; the UV embossing can achieve a unique combination effect of frosted and bright by designing the depth and shape of the concave-convex texture; the transfer texture using the mold core texture can conveniently and quickly form matte and bright areas; the masking spraying can accurately form bright areas on the matte basis; these diverse process technologies provide rich choices for production enterprises, and enterprises can flexibly select according to factors such as product characteristics, expected effects, and costs. At the same time, it also reflects the innovation and advancement in process technology. Description of the Drawings

[0077] Figure 1 It is a schematic structural diagram of the in-mold transfer diaphragm for positioning multiple gloss levels in Embodiment 1 of the present invention;

[0078] Figure 2 It is a schematic structural diagram of the in-mold transfer molded part for positioning multiple gloss levels in Embodiment 1 of the present invention;

[0079] Figure 3 It is a schematic structural diagram of the in-mold transfer diaphragm for positioning multiple gloss levels in Embodiment 2 of the present invention;

[0080] Figure 4 It is a schematic structural diagram of an in-mold transfer molded part for positioning multiple gloss levels in Embodiment 2 of the present invention;

[0081] Figure 5 It is a schematic structural diagram of an in-mold transfer film for positioning multiple gloss levels in Embodiment 3 of the present invention;

[0082] Figure 6 It is a schematic structural diagram of an in-mold transfer molded part for positioning multiple gloss levels in Embodiment 3 of the present invention;

[0083] Figure 7 It is a schematic structural diagram of an in-mold transfer film for positioning multiple gloss levels in Embodiment 4 of the present invention;

[0084] Figure 8 It is a schematic structural diagram of a semi-finished in-mold transfer molded part for positioning multiple gloss levels in Embodiment 4 of the present invention;

[0085] Figure 9 It is a spraying schematic diagram of a semi-finished in-mold transfer molded part for positioning multiple gloss levels in Embodiment 4 of the present invention;

[0086] Figure 10 It is a schematic structural diagram of an in-mold transfer molded part for positioning multiple gloss levels in Embodiment 4 of the present invention;

[0087] Figure 11 It is a schematic structural diagram of an in-mold transfer film for positioning multiple gloss levels in Embodiment 5 of the present invention;

[0088] Figure 12 It is a schematic structural diagram of an in-mold transfer mold cavity for positioning multiple gloss levels in Embodiment 5 of the present invention;

[0089] Figure 13 It is a schematic structural diagram of an in-mold transfer molded part for positioning multiple gloss levels in Embodiment 5 of the present invention.

[0090] Description of the markings in the figure:

[0091] 1 - Antistatic layer, 2 - Base film, 3 - Bright release layer, 4 - First matte release layer, 5 - Second matte release layer, 6 - Hardening layer, 7 - Connection layer, 8 - Ink combination layer, 9 - Adhesive layer, 10 - Resin layer, 11 - UV embossing layer, 12 - UV layer, 13 - Film, 14 - Spray head, 15 - Mold core, 16 - Waste film;

[0092] 4-1 - First matte powder, 5-1 - Second matte powder, 6-1 - Bright gloss surface, 6-2 - First matte gloss surface, 6-3 - Second matte gloss surface, 8-1 - Registration ink layer, 12-1 - UV bright gloss surface, 15-1 - Smooth cavity, 15-2 - Textured cavity. Detailed implementation manners

[0093] The present invention will be described in detail below in conjunction with specific embodiments. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation procedures are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0094] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, and only represent different instances referring to the same object, rather than implying that the objects described in this way must be in a given order, whether in terms of time, space, sorting, or any other way.

[0095] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] Unless otherwise specified, the equipment used in the following embodiments represents conventional equipment in the art; unless otherwise specified, the reagents used represent commercially available products or are prepared by conventional methods in the art. Those not described in detail in the following embodiments can be achieved by using conventional experimental means in the art.

[0097] Example 1:

[0098] An in-mold transfer film for positioning multiple gloss levels, as Figure 1 shown, includes a base film 2. An antistatic layer 1 is laminated on one side of the base film 2, and a bright release layer 3, a first matte release layer 4, a hardening layer 6, a connection layer 7, an ink combination layer 8, and an adhesive layer 9 are laminated on the other side;

[0099] The base film 2 mainly serves as a transfer carrier in the in-mold transfer film. All subsequent coatings are processed on the base film 2. After the transfer is completed, the base film 2 is immediately scrapped;

[0100] The material of the base film 2 is not particularly limited, and thermoplastic materials such as polypropylene (PP) resin, polyethylene (PE) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, polycarbonate (PC) resin, polyethylene terephthalate (PET) resin, etc. can be cited, or a composite of two or more of them. In this embodiment, polyethylene terephthalate resin is preferably used;

[0101] During the selection process, the base film 2 with high flatness, low haze, and large stretchability should be selected as much as possible, which helps to improve the yield of the product;

[0102] The thickness of the base film 2 is generally 20-200 μm. Considering stretchability and supportability, it is preferably 45-80 μm, and in this embodiment, it is preferably 75 μm;

[0103] The main function of the antistatic layer 1 is to eliminate the static electricity generated during the processing of the film sheet, thereby reducing the adsorption of dust and other impurity particles on the film sheet and improving the cleanliness of the film sheet;

[0104] The material of the antistatic layer 1 is not particularly limited, and inorganic antistatic agents, polymer conductive compositions, quaternary ammonium salt antistatic agents, polyether antistatic agents, etc. can be cited, or a composite of two or more of them. In this embodiment, a polymer conductive composition is preferably used;

[0105] The processing method of the antistatic layer 1 generally selects a coating process. The thickness of the antistatic layer 1 is generally 0.1-3 μm, and in this embodiment, it is preferably 0.5 μm;

[0106] The bright release layer 3 and the first matte release layer 4 are layers provided to satisfy the transfer function of the pattern, and at the same time endow the transferred product with different gloss degrees;

[0107] As the release layer, the base materials of the bright release layer 3 and the first matte release layer 4 are the same, and epoxy resin, fluororesin, silicone resin, solvent wax, etc. can be cited, or a composite of two or more of them. In this embodiment, silicone resin is preferably used;

[0108] Due to the similar materials of the bright release layer 3 and the first matte release layer 4, the adhesion between them and the base film 2 is good. During the injection molding process of in-mold transfer, the bright release layer 3, the first matte release layer 4 and the base film 2 are peeled off together to complete the transfer;

[0109] The processing methods of the bright release layer 3 and the first matte release layer 4 generally both select a coating process. The thickness of the bright release layer 3 is generally 0.5-3 μm, and in this embodiment, it is preferably 1 μm. The thickness of the first matte release layer 4 is generally 1-4 μm, and in this embodiment, it is preferably 1.5 μm;

[0110] One difference between the first matte release layer 4 and the glossy release layer 3 is that the first matte release layer 4 is additionally added with a first matte powder 4-1. The material of the first matte powder 4-1 can include organic particles such as silicon dioxide, silicate, zinc stearate, talc, or a combination of two or more thereof, with a particle size of 0.1-3 μm. In this embodiment, silicon dioxide particles with an average particle size of 1 μm are preferred.

[0111] The granular first matte powder 4-1 is evenly dispersed in the first matte release layer 4. After coating, some particles adhere to the surface, forming a granular convex and concave feeling. This convex and concave feeling will form diffuse reflection, which is the so-called matte effect.

[0112] By adjusting the content and particle size of the first matte powder 4-1, the roughness of the surface of the first matte release layer 4 can be adjusted, thereby achieving a predictable glossiness of the product. The surface roughness of the first matte release layer 4 is 0.3-3 μm, preferably 1.5 μm in this embodiment, and the glossiness is 10-70 GU, preferably 60 GU in this embodiment.

[0113] On the contrary, the glossy release layer 3 does not contain these particles, and the base material of the glossy release layer 3 itself has very weak convexoconcave feeling and a relatively flat surface, thus forming a glossy effect;

[0114] The surface roughness of the glossy release layer 3 is 0.1-0.5 μm, preferably 0.3 μm in this embodiment, and the glossiness is ≥ 90 GU, preferably 92 GU in this embodiment;

[0115] The second difference between the first matte release layer 4 and the glossy release layer 3 is that the glossy release layer 3 is applied all over the surface, while the first matte release layer 4 is applied locally, allowing for the design of specific areas to match the printing effect. In this embodiment, the first matte release layer 4 is applied to all areas except the intended logo. As a result, only the logo on the final product has a glossy effect, while other areas have a matte effect.

[0116] Generally speaking, the matte gloss range is adjustable, and molded parts with a variety of different gloss combinations can be produced. However, in order to ensure a clear contrast, it is recommended that the gloss difference between the first matte release layer 4 and the glossy release layer 3 be greater than 30GU;

[0117] The hardening layer 6 is designed to give the final molded part hardness, wear resistance and other durability. It is placed on the surface of the molded part to effectively protect the pattern from being scratched and damaged.

[0118] After the transfer is completed, the fine convex and concave texture formed on the surfaces of the bright release layer 3 and the first matte release layer 4 can be completely replicated onto the hardening layer 6, forming a corresponding sense of convex and concave texture. When placed on the product surface, therefore, the surface roughness of the final product is the same as that of the release layer, forming two different gloss levels, namely the bright gloss surface 6-1 and the first matte gloss surface 6-2;

[0119] It should be noted that although the coating thickness in the areas with different gloss levels in the figure seems to be different, in fact, compared with the formed part, the thickness of the release layer is very small, and the height difference is hardly visible to the naked eye. Only the junction between the bright area and the matte area can be slightly felt through touch;

[0120] The material of the hardening layer 6 is not particularly limited. UV materials such as polyacrylate, polyurethane, and isocyanate can be listed, or a combination of two or more of them can be used. In this embodiment, polyacrylate is preferably used, which takes into account flexibility and hardness and can reach a pencil hardness of 1H;

[0121] The processing method of the hardening layer 6 generally selects the coating process and is processed in combination with ultraviolet light curing according to the selected material. The thickness of the hardening layer 6 is generally 5-20 μm, and 6 μm is preferably used in this embodiment;

[0122] The connection layer 7 is used to enhance the adhesion between the hardening layer 6 and the ink combination layer 8. It has excellent flexibility and impact resistance, can form a firm connection between the hardening layer 6 and the ink combination layer 8, and can also adapt to the thermal expansion differences between different materials to prevent cracking or peeling during subsequent use;

[0123] The material of the connection layer 7 is not particularly limited. Polyurethane, polycarbonate, etc. can be listed, or a combination of two or more of them can be used. In this embodiment, polyurethane is preferably used;

[0124] The processing method of the connection layer 7 generally selects the coating process. The thickness of the connection layer 7 is generally 1-15 μm, and 3 μm is preferably used in this embodiment;

[0125] The ink combination layer 8 is a layer designed to endow the product with excellent decorative effects and is the key to highlighting elements such as the appearance color, pattern, window, logo, etc. of the product;

[0126] The material of the ink combination layer 8 is not particularly limited and mainly includes ink, metal powder, diluent, curing agent, etc. It is selected according to the designed pattern. The material of the metal powder can be listed as silver powder, aluminum powder, pearlescent powder, matte powder, etc., or a combination of two of them. In this embodiment, silver powder is preferably used to highlight the metallic texture;

[0127] The ink combination layer 8 can be processed in different ways according to the required decorative effect, and screen printing process, intaglio printing process, offset printing process, etc. can be listed. In addition, a metal thin film layer formed by using a vacuum magnetron sputtering process may also be selected. In this embodiment, the screen printing process is preferably used;

[0128] The overall thickness of the ink combination layer 8 is determined by the design pattern and the number of printing times, and the thickness is generally 5 - 100 μm. In this embodiment, it is preferably 15 μm;

[0129] In particular, a registration ink layer 8-1 will be designed in the ink combination layer 8. The registration ink layer 8-1 is printed on the position corresponding to the uncoated area of the first matte release layer 4 by using the processing method of the precise registration printing process, that is, the printing area of the registration ink layer 8-1 is precisely coincided with the bright area to form a combination of color and gloss, giving the product rich layers and texture;

[0130] In this embodiment, the registration ink layer 8-1 is printed in the logo area. In the finally formed product, only the logo has a relatively high gloss, presenting a bright effect, while the gloss of other areas is relatively low, presenting a matte effect;

[0131] The adhesive layer 9 is a layer provided for the ink combination layer 8 to be tightly combined with the resin layer 10;

[0132] The material of the adhesive layer 9 is not particularly limited, and hot melt adhesives such as polyacrylate, polycarbonate, ethylene-vinyl acetate copolymer (EVA), etc. can be listed, or a combination of two or more of them. In this embodiment, polyacrylate is preferably used;

[0133] The processing method of the adhesive layer 9 generally selects the coating process or the printing process. In this embodiment, the coating process is preferably used. The thickness of the adhesive layer 9 is generally 3 - 20 μm. In this embodiment, it is preferably 5 μm.

[0134] The preparation method of the in-mold transfer film sheet for positioning multiple gloss levels is as follows:

[0135] S1. Preparation of an in-mold transfer release film with local bright and local matte positioning,

[0136] S11. Coating an antistatic layer 1 on one side of the base film 2 by using the processing method of the microgravure coating process;

[0137] S12. Coating a bright release layer 3 on the other side of the base film 2 by using the processing method of the microgravure coating process;

[0138] S13. Coating a first matte release layer 4 on the bright release layer 3 by using the processing method of the microgravure coating process. The first matte release layer 4 is only coated on a partial area;

[0139] S14. Apply a layer of UV material on the bright release layer 3 and the first matte release layer 4 by means of microgravure coating process, and cure it by using ultraviolet light irradiation to form a hardened layer 6;

[0140] S15. Apply a layer of connection layer 7 on the hardened layer 6 by means of microgravure coating process to obtain an in-mold transfer release film with positioned local brightness and local matte;

[0141] S2. Preparation of in-mold transfer film sheet with positioned local brightness and local matte

[0142] S21. Print an ink combination layer 8 on the connection layer 7 of the release film by means of screen printing process;

[0143] Specifically, first print a registration ink layer 8-1 on the area of the connection layer 7 where the first matte release layer 4 was not applied in step S13 by means of precise registration printing process to form a separate color, and then print the ink combination layer 8;

[0144] S22. Apply a layer of adhesive layer 9 on the ink combination layer 8 by means of microgravure coating process;

[0145] S23. Place it at 40 - 80 °C for 24 - 96 h, preferably at 50 °C for 72 h in this embodiment, so that the film sheet is fully cured to obtain an in-mold transfer film sheet with positioned local brightness and local matte.

[0146] The application of the above in-mold transfer film sheet with positioned multiple gloss levels is applied to in-mold transfer molded parts with positioned multiple gloss levels, such as Figure 2 As shown, during the injection molding of in-mold transfer, the base film 2 is peeled off together with the waste film sheet 16 including the antistatic layer 1, the bright release layer 3 and the first matte release layer 4. The remaining part of the coating of the in-mold transfer film sheet is tightly connected to the resin layer 10 through the adhesive layer 9, and the formed bright gloss surface 6-1 and the first matte gloss surface 6-2 are placed on the surface of the molded part to obtain a molded part product with two gloss levels;

[0147] The resin layer 10 is the main body of the in-mold transfer molded part. Cooperating with the in-mold transfer process, part of the coating of the film sheet is transferred to the molded part, and the formed product has rich decorative effects and different gloss effects;

[0148] The resin layer 10 can be made of different materials according to its use. The materials can include thermoplastic materials such as polypropylene resin, polyethylene resin, acrylonitrile-butadiene-styrene copolymer resin, polycarbonate resin, polyethylene terephthalate resin, etc., or a composite of two or more of them. In this embodiment, acrylonitrile-butadiene-styrene copolymer resin is preferably used;

[0149] The processing method of the resin layer 10 generally selects the injection molding process. According to different product designs, the thickness of the resin layer 10 is generally 2 - 10 mm, and is preferably 3 mm in this embodiment. Comparatively speaking, this is much larger than the thickness of all the foregoing coatings.

[0150] The preparation method of an in-mold transfer molding part with multiple gloss levels located correspondingly is as follows:

[0151] S3. Preparation of an in-mold transfer molding part with local gloss and local matte finish

[0152] S31. Using the processing method of the in-mold transfer process, transfer some coatings including the hardening layer 6, the connecting layer 7, the ink combination layer 8, and the adhesive layer 9 in the in-mold transfer film to the resin layer 10. The hardening layer 6 is placed on the surface of the molding part to obtain an in-mold transfer molding part with local gloss and local matte finish.

[0153] Example 2:

[0154] An in-mold transfer film with multiple gloss levels located correspondingly, as Figure 3 shown, is basically the same as Example 1. The difference is that a second matte release layer 5 is added between the first matte release layer 4 and the hardening layer 6, that is, a bright release layer 3, a first matte release layer 4, a second matte release layer 5, a hardening layer 6, a connecting layer 7, an ink combination layer 8, and an adhesive layer 9 are laminated on the other side of the base film 2;

[0155] The base materials of the first matte release layer 4 and the second matte release layer 5 are the same. The processing method generally selects the coating process. The thickness of the second matte release layer 5 is generally 1 - 4 μm, and is preferably 1.7 μm in this embodiment;

[0156] The difference between the second matte release layer 5 and the first matte release layer 4 is that the second matte powder 5-1 contained in the second matte release layer 5 has larger particles, forms a higher roughness on the surface of the second matte release layer 5, and the gloss of the final product is smaller. The materials of the second matte powder 5-1 can include organic particles such as silica, silicate, zinc stearate, talc powder, etc., or a composite of two or more of them. The particle size is 0.5 - 3.5 μm, and is preferably silica particles with an average particle size of 1.5 μm in this embodiment. The surface roughness of the second matte release layer 5 is 0.6 - 3.5 μm, and is preferably 2 μm in this embodiment. The gloss is 8 - 40 GU, and is preferably 30 GU in this embodiment;

[0157] The second matte release layer 5 is locally coated, and the coating area should be smaller than that of the first matte release layer 4 to form a more matte effect in the coating area with a partial matte effect;

[0158] It should be noted that the coating order of the first matte release layer 4 and the second matte release layer 5 cannot be reversed. This is because the particle concave-convex texture formed by the second matte release layer 5 has a relatively large depth, and it is possible that the first matte release layer 4 cannot fill the particle concave-convex texture of the second matte release layer 5 after the coating order is reversed, resulting in the glossiness of the first matte release layer 4 not reaching the expected value;

[0159] After the in-mold transfer is completed, three different glossiness levels, namely a bright gloss surface 6-1 with a bright effect, a first matte gloss surface 6-2 with a matte effect, and a second matte gloss surface 6-3 with a more matte effect, are formed on the surface of the final product, further enhancing the layering and texture of the product;

[0160] In this way, theoretically, products with more glossiness levels can be designed. However, when the number of coating layers of the local release layer is larger, the defects become more uncontrollable. Here, only products with three or fewer glossiness levels are recommended for development.

[0161] The preparation method of the in-mold transfer film sheet for positioning multiple glossiness levels is basically the same as that of Embodiment 1, except that in step S13, a first matte release layer 4 is coated on the bright release layer 3 by using a microgravure coating process in a processing manner, and the first matte release layer 4 is only coated on a partial area. Then, a second matte release layer 5 is coated on the first matte release layer 4 by using a microgravure coating process in a processing manner, and the second matte release layer 5 is only coated on a smaller partial area. In step S14, a layer of UV material is coated on the bright release layer 3, the first matte release layer 4, and the second matte release layer 5 by using a microgravure coating process in a processing manner, and curing is completed by using ultraviolet light irradiation to form a hardening layer 6.

[0162] The application of the in-mold transfer film sheet for positioning multiple glossiness levels is as Figure 4 shown, which is basically the same as that of Embodiment 1, except that during the injection molding of the in-mold transfer, the base film 2 is peeled off together with the waste film sheet 16 including the antistatic layer 1, the bright release layer 3, the first matte release layer 4, and the second matte release layer 5, and the formed bright gloss surface 6-1, the first matte gloss surface 6-2, and the second matte gloss surface 6-3 are placed on the surface of the molded part to obtain a molded part product with three glossiness levels.

[0163] The preparation method of the corresponding in-mold transfer molded part for positioning multiple glossiness levels is the same as that of Embodiment 1.

[0164] Embodiment 3:

[0165] An in-mold transfer film sheet for positioning multiple glossiness levels, as Figure 5As shown, it is basically the same as Embodiment 1, except that the first matte release layer 4 is cancelled between the bright release layer 3 and the hardening layer 6, and a UV embossing layer 11 is added between the base film 2 and the bright release layer 3. That is, the UV embossing layer 11, the bright release layer 3, the hardening layer 6, the connecting layer 7, the ink combination layer 8, and the adhesive layer 9 are laminated on the other side of the base film 2.

[0166] There is no particular limitation on the material of the UV embossing layer 11. UV materials such as epoxy acrylate, polyester acrylate, and polymethacrylate can be listed, or a composite of two or more of them. In this embodiment, polyester acrylate is preferably used.

[0167] The processing method of the UV embossing layer 11 is selected as the embossing process. While coating the UV material, a local texture structure is embossed on its surface, and then ultraviolet light curing is immediately carried out. The texture structure is a shape with a set regular convex and concave depth on the surface, combined with a smooth texture to achieve different gloss degrees.

[0168] According to the expected designed gloss degree, the convex and concave texture depth on the plate roller can be adjusted. The surface roughness of the convex and concave texture is 2 - 30 μm, preferably 5 μm in this embodiment. The gloss degree is 10 - 70 GU, preferably 60 GU in this embodiment. The surface roughness of the smooth texture is 0.1 - 2 μm, preferably 0.2 μm in this embodiment, and the gloss degree ≥ 90 GU, preferably 92 GU in this embodiment.

[0169] Considering the convex and concave deep groove depth, the thickness of the UV embossing layer 11 is 3 - 35 μm, preferably 10 μm in this embodiment.

[0170] In particular, the convex and concave texture can also be designed into two, three, or even more types, and the molded parts form a variety of different gloss degrees.

[0171] It should be noted that the thickness of the bright release layer 3 is very small, far lower than the depth of the convex and concave texture, and will not fill the convex and concave texture. Therefore, after in-mold transfer, the convex and concave texture will also be transferred to the product, forming different gloss degrees, that is, the bright gloss surface 6 - 1 and the first matte gloss surface 6 - 2.

[0172] Compared with Embodiment 1, Embodiment 3 can achieve better effects because of the designability and controllability of the convex and concave texture depth and shape. For example, a product combining a lower matte texture and a bright effect is formed, and the decorative effect is better. However, due to the existence of the UV embossing layer 11, the overall stretchability of the film is deteriorated, and it is only applicable to products with a relatively flat shape.

[0173] The preparation method of the in-mold transfer film sheet for positioning multiple glossiness levels is basically the same as that of Example 1. The difference lies in that step S13 is not adopted. In step S12, while coating a layer of UV material on the other side of the base film 2 by means of microgravure coating, convex and concave textures are embossed in some areas on the surface, and then immediately cured by ultraviolet light irradiation to form a UV embossing layer 11. Then, a bright release layer 3 is coated on the UV embossing layer 11 by means of microgravure coating. In step S14, a layer of UV material is coated on the bright release layer 3 by means of microgravure coating and cured by ultraviolet light irradiation to form a hardening layer 6.

[0174] The application of the in-mold transfer film sheet for positioning multiple glossiness levels, as Figure 6 shown, is basically the same as that of Example 1. The difference lies in that during the injection molding of in-mold transfer, the base film 2 is peeled off together with the waste film sheet 16 including the antistatic layer 1, the UV embossing layer 11, and the bright release layer 3.

[0175] The preparation method of the corresponding in-mold transfer molded part for positioning multiple glossiness levels is the same as that of Example 1.

[0176] Example 4:

[0177] An in-mold transfer film sheet for positioning multiple glossiness levels, as Figures 7 to 9 shown, is basically the same as that of Example 1. The difference lies in that the bright release layer 3 is cancelled between the base film 2 and the first matte release layer 4, and the first matte release layer 4 is changed to full-surface coating, that is, the first matte release layer 4, the hardening layer 6, the connecting layer 7, the ink combination layer 8, and the adhesive layer 9 are laminated on the other side of the base film 2. After the in-mold transfer is completed, a UV layer 12 is added on the hardening layer 6 on the surface of the molded part;

[0178] The material of the UV layer 12 is not particularly limited, and UV materials such as epoxy acrylate, polyester acrylate, and polymethacrylic acid can be listed, or a composite of two or more of them. In this example, polyester acrylate is preferably used;

[0179] After the in-mold transfer is completed, the overall product presents a matte effect. Then, under the shielding of the film 13, UV material is locally sprayed in a positioned manner, and then immediately cured by ultraviolet light irradiation to form a bright-effect UV layer 12;

[0180] On the one hand, the function of the UV layer 12 is the same as that of the hardening layer 6, which plays a role in protecting the pattern. On the other hand, at the logo of the film 13, that is, the concave-convex texture with a matte effect presented by the molded part in the hollowed area of the film will be filled by the UV layer 12 to form a bright effect. For the part blocked by the film 13, that is, the non-hollowed area, there will be no UV layer 12, and the original matte effect is retained. As a whole, a product with two gloss degrees, namely the UV bright gloss surface 12-1 and the first matte gloss surface 6-2, is formed.

[0181] The thickness of the UV layer 12 is generally 5-20 μm, and is preferably 6 μm in this embodiment.

[0182] The surface roughness of the UV layer 12 is 0.1-0.5 μm, and is preferably 0.3 μm in this embodiment. The gloss degree ≥90 GU, and is preferably 92 GU in this embodiment.

[0183] The preparation method of the in-mold transfer film sheet for positioning multiple gloss degrees is basically the same as that of Embodiment 1. The difference is that step S12 is not adopted, and in step S13, a first matte release layer 4 is coated on the other side of the base film 2 by using a microgravure coating process.

[0184] The application of the in-mold transfer film sheet for positioning multiple gloss degrees, such as Figure 10 shown, is basically the same as that of Embodiment 1. The difference is that during the injection molding of in-mold transfer, after the base film 2 and the waste film 16 including the antistatic layer 1 and the first matte release layer 4 are peeled off, and the formed first matte gloss surface 6-2 is placed on the surface of the molded part, the bright gloss surface 12-1 is sprayed under the shielding of the film 13.

[0185] The corresponding preparation method of the in-mold transfer molded part for positioning multiple gloss degrees is basically the same as that of Embodiment 1. The difference is that after the hardening layer 6 is placed on the surface of the molded part in step S31, a film 13 is designed, the film 13 is laminated on the surface of the hardening layer 6, a layer of UV material is sprayed, and curing is completed by using ultraviolet light irradiation to form the UV layer 12.

[0186] Embodiment 5:

[0187] An in-mold transfer film sheet for positioning multiple gloss degrees, such as Figure 11 and Figure 12 shown, is basically the same as that of Embodiment 1. The difference is that the first matte release layer 4 is cancelled between the bright release layer 3 and the hardening layer 6, that is, on the other side of the base film 2, there are laminated the bright release layer 3, the hardening layer 6, the connecting layer 7, the ink combination layer 8, and the adhesive layer 9, and concave-convex textures are added in the mold core 15 of the in-mold transfer mold.

[0188] By locally engraving different convex and concave textures on the mold cavity, a smooth cavity 15-1 and a textured cavity 15-2 are formed in the mold core 15. After in-mold transfer, the products with convex and concave textures form diffuse reflection due to the uneven surface, showing a matte effect, while other areas are relatively flat, showing a bright effect;

[0189] The embossing depth of the convex and concave texture is 7-25μm, preferably 8μm in this embodiment, and the glossiness is 10-70GU, preferably 60GU in this embodiment;

[0190] It should be noted that during the in-mold transfer process, the texture of the mold cavity is transferred to the hardened layer 6 through the base film 2. Since the base film 1 has a certain thickness, some texture loss will occur during this process, resulting in the roughness of the mold cavity not being completely replicated onto the product and the expected glossiness not being obtained. However, this can be corrected by deepening the depth of the texture of the mold cavity, and finally a bright gloss surface 6-1 and a first matte gloss surface 6-2 are obtained;

[0191] Compared with Embodiments 1 to 4, Embodiment 5 realizes different glossiness through an in-mold transfer mold, with poor flexibility, that is, one mold can only produce products with one effect. If products with other glossiness need to be developed, new molds need to be developed; while Embodiments 1 to 4 realize different glossiness through the film, which is more convenient to adjust and can achieve multiple effects at low cost.

[0192] The preparation method of the in-mold transfer film sheet for positioning multiple glossiness is basically the same as that of Embodiment 1, except that step S13 is not taken. In step S14, a layer of UV material is coated on the bright release layer 3 by a micro-embossing coating process and cured by ultraviolet light irradiation to form the hardened layer 6.

[0193] The application of the in-mold transfer film sheet for positioning multiple glossiness is as Figure 13 shown, which is basically the same as that of Embodiment 1, except that during the injection molding of in-mold transfer, the base film 2 is peeled off together with the waste film sheet 16 including the antistatic layer 1 and the bright release layer 3.

[0194] The preparation method of the corresponding in-mold transfer molded part for positioning multiple glossiness is the same as that of Embodiment 1.

[0195] Comparative Example 1:

[0196] An in-mold transfer film sheet is basically the same as that of Embodiment 1, except that it includes a base film 2, an antistatic layer 1 is laminated on one side of the base film 2, and a bright release layer 3, a hardened layer 6, a connection layer 7, an ink combination layer 8, and an adhesive layer 9 are laminated on the other side.

[0197] The preparation method of the above in-mold transfer film is basically the same as that of Example 1, except that step S13 is not adopted. In step S14, a layer of UV material is coated on the bright release layer 3 by using a gravure coating process, and curing is completed by using ultraviolet light irradiation to form a hardening layer 6.

[0198] An in-mold transfer molded part and its preparation method are basically the same as those of Example 1, except that during the injection molding of in-mold transfer, the base film 2 is peeled off together with the waste film 16 including the antistatic layer 1 and the bright release layer 3, and the formed bright gloss surface 6-1 is placed on the surface of the molded part to obtain a molded part product with a certain bright gloss.

[0199] Comparative Example 2:

[0200] An in-mold transfer film and its preparation method are basically the same as those of Example 1, except that it includes a base film 2, an antistatic layer 1 is laminated on one side of the base film 2, and a first matte release layer 4, a hardening layer 6, a connecting layer 7, an ink combination layer 8, and an adhesive layer 9 are laminated on the other side. The first matte release layer 4 is changed to full-surface coating.

[0201] The preparation method of the above in-mold transfer film is basically the same as that of Example 1, except that step S12 is not adopted. In step S13, a layer of the first matte release layer 4 is coated on the other side of the base film 2 by using a gravure coating process.

[0202] An in-mold transfer molded part and its preparation method are basically the same as those of Example 1, except that during the injection molding of in-mold transfer, the base film 2 is peeled off together with the waste film 16 including the antistatic layer 1 and the first matte release layer 4, and the formed first matte gloss surface 6-2 is placed on the surface of the molded part to obtain a molded part product with a certain matte gloss.

[0203] The following tests or experiments are carried out on the above films and molded parts, and then the test or experiment results are analyzed.

[0204] Test Example:

[0205] The above films and molded parts are tested in two dimensions of production difficulty and decoration effect. The specific steps are as follows:

[0206] Film stretchability: The film is cut into strips 5 mm wide, and the film stretch test is carried out by using a universal tensile strength testing machine. Under different strains of the film, the cracking situation of the coating on the film is observed and compared. The film stretchability index measures the applicability of the film to the product shape and is a very key performance of the film. The smaller the cracking degree of the coating during the stretching process, the greater the stretchability of the film, the less likely it is to crack during injection molding, and the better the applicability. The film with the largest film stretchability is represented by 5 ☆;

[0207] Processability: Considering the ease and complexity of processing the diaphragm and the formed parts during the process, the overall yield of each process is statistically calculated, and the process with the highest yield is represented by 5 ☆;

[0208] Gloss measurement: Measure the gloss of different positions of the product with a gloss meter at a measurement angle of 60°;

[0209] Appearance evaluation: Observe the formed parts from different angles, and subjectively evaluate the texture, layering, beauty, etc. of the product to obtain the decorative effect, and the best effect is 5 ☆.

[0210] The judgment results of the examples and comparative examples are shown in Table 1.

[0211] Table 1 Judgment Results of Examples and Comparative Examples

[0212]

[0213] As shown in Table 1, the formed parts in the examples can achieve various gloss effects of the product compared with the comparative examples, greatly improving the decoration of the in-mold transfer products;

[0214] Compared with Example 1, the formed part in Example 2 can achieve three glosses of the product, but the process is relatively complex and the processability is reduced;

[0215] Compared with Example 1, in Example 3, due to the depth, shape design and regulation of the concave-convex texture of the formed part, the achieved effect is more prominent. For example, a product combining a matte texture with a lower matte degree and a bright light effect is formed, and the decorative effect is better; but due to the presence of the UV embossing layer 11, the overall stretchability of the diaphragm becomes worse, and it is only suitable for products with a relatively flat shape;

[0216] Compared with Example 1, in Example 4, the process of the formed part is relatively complex, resulting in a possible reduction in the yield;

[0217] Compared with Example 1, in Example 5, the process of the formed part is relatively simple, but the flexibility is poor, that is, one mold can only produce a product with one effect. If products with other glosses are to be developed, new molds need to be developed; at the same time, the gloss of the formed part in Example 5 is unpredictable and may require repeated corrections, resulting in an increase in the development difficulty, but the later production stability is better.

[0218] The present invention can endow the in-mold transfer products with various different glosses, significantly improve the decorative effects such as the texture, layering and beauty of the products, and the processing technology is reliable and can be mass-produced normally.

[0219] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention as disclosed should be within the protection scope of the present invention.

Claims

1. An in-mold transfer film for positioning multiple glossiness levels, characterized in that, The diaphragm includes a base film (2), on one side of which a hardening layer (6), a connecting layer (7), an ink combination layer (8), and an adhesive layer (9) are laminated. After in-mold transfer of the diaphragm, a bright gloss surface and a matte gloss surface are provided on the hardening layer (6). The bright gloss surface is formed by a bright release layer (3) before in-mold transfer or a UV layer (12) after in-mold transfer. The matte gloss surface is formed by a matte release layer before in-mold transfer, the concave-convex texture of a UV embossing layer (11) before in-mold transfer, or the concave-convex texture inside a mold core (15) during in-mold transfer.

2. The in-mold transfer film sheet for positioning multiple glossiness degrees according to claim 1, wherein, The bright gloss surface is formed by the bright release layer (3) before in-mold transfer, and the matte gloss surface is formed by the matte release layer before in-mold transfer. The bright release layer (3) is coated in a full version, and the matte release layer is coated in a positioned partial version, and / or The bright gloss surface is formed by the bright release layer (3) before in-mold transfer, and the matte gloss surface is formed by the concave-convex texture of the UV embossing layer (11) before in-mold transfer. The bright release layer (3) is coated in a full version, and the UV embossing layer (11) is positioned and partially embossed into a texture structure on its surface while coating the UV material. The texture structure is a shape with concave-convex depth on the surface, combined with a smooth texture, and / or The bright gloss surface is formed by the UV layer (12) after in-mold transfer, and the matte gloss surface is formed by the matte release layer before in-mold transfer. The matte release layer is coated in a full version. After in-mold transfer is completed, a UV layer (12) is provided on the hardening layer (6), and the UV material is positioned and partially sprayed under the shielding of a film (13) to form the UV layer, and / or The bright gloss surface is formed by the bright release layer (3) before in-mold transfer, and the matte gloss surface is formed by the concave-convex texture inside the mold core (15) during in-mold transfer. The bright release layer (3) is coated in a full version, and a smooth cavity (15-1) and a textured cavity (15-2) are formed inside the mold core (15).

3. The in-mold transfer film sheet for positioning multiple glossiness according to claim 2, characterized in that, A bright release layer (3) and a matte release layer are sequentially provided between the base film (2) and the hardening layer (6). The base materials of the bright release layer (3) and the matte release layer are each selected from one or more of epoxy resin, fluororesin, silicone resin, and solvent wax. The thickness of the bright release layer (3) is 0.5 - 3 μm, and the thickness of the matte release layer is 1 - 4 μm; The matte release layer contains matte powder, and the material of the matte powder is selected from one or more of silicon dioxide, silicate, zinc stearate, and talcum powder, with a particle size of 0.1 - 3.5 μm; The surface roughness of the matte release layer is 0.3 - 3 μm, and the glossiness is 8 - 70 GU; The surface roughness of the bright release layer (3) is 0.1 - 0.5 μm, and the glossiness ≥ 90 GU.

4. The in-mold transfer film sheet for positioning multiple glossiness degrees according to claim 3, wherein, When the matte release layer is provided with two layers, namely the first matte release layer (4) and the second matte release layer (5), the first matte release layer (4) and the second matte release layer (5) are sequentially arranged between the bright release layer (3) and the hardening layer (6). The thickness of the first matte release layer (4) is 1 - 4 μm, and the thickness of the second matte release layer (5) is 1 - 4 μm; The first matte release layer (4) contains a first matte powder (4 - 1), and the material of the first matte powder (4 - 1) is selected from one or more of silica, silicate, zinc stearate, and talcum powder, with a particle size of 0.1 - 3 μm; The second matte release layer (5) contains a second matte powder (5 - 1), and the material of the second matte powder (5 - 1) is selected from one or more of silica, silicate, zinc stearate, and talcum powder, with a particle size of 0.5 - 3.5 μm; The surface roughness of the first matte release layer (4) is 0.3 - 3 μm, and the glossiness is 10 - 70 GU; The surface roughness of the second matte release layer (5) is 0.6 - 3.5 μm, and the glossiness is 8 - 40 GU.

5. The in-mold transfer film sheet for positioning multiple gloss levels according to claim 2, characterized in that, An UV embossing layer (11) and a bright release layer (3) are sequentially arranged between the base film (2) and the hardening layer (6). The material of the UV embossing layer (11) is selected from one or more UV materials such as epoxy acrylate, polyester acrylate, and polymethacrylic acid. The surface roughness of the convex and concave texture of the UV embossing layer (11) is 2 - 30 μm, and the glossiness is 10 - 70 GU. The surface roughness of the smooth texture is 0.1 - 2 μm, and the glossiness ≥ 90 GU. The thickness of the UV embossing layer (11) is 3 - 35 μm, and / or A matte release layer is arranged between the base film (2) and the hardening layer (6). The material of the UV layer (12) is selected from one or more UV materials such as epoxy acrylate, polyester acrylate, and polymethacrylic acid. The thickness of the UV layer (12) is 5 - 20 μm, the surface roughness is 0.1 - 0.5 μm, and the glossiness ≥ 90 GU, and / or A bright release layer (3) is arranged between the base film (2) and the hardening layer (6). The embossing depth of the convex and concave texture of the engraved cavity (15 - 2) is 7 - 25 μm, and the glossiness is 10 - 70 GU.

6. The in-mold transfer film sheet for positioning multiple glossinesses according to claim 1, wherein, The material of the hardening layer (6) is selected from one or more of polyacrylate, polyurethane, and isocyanate, with a thickness of 5 - 20 μm; The material of the connecting layer (7) is selected from one or more of polyurethane and polycarbonate, with a thickness of 1 - 15 μm; The thickness of the ink combination layer (8) is 5 - 100 μm; The material of the adhesive layer (9) is selected from one or more of polyacrylate, polycarbonate, and ethylene - vinyl acetate copolymer, with a thickness of 3 - 20 μm.

7. An in-mold transfer film sheet for positioning multiple gloss levels according to claim 1, characterized in that, A registration ink layer (8 - 1) is arranged in the ink combination layer (8), and the registration ink layer (8 - 1) is printed at a position corresponding to the bright gloss surface by using the processing method of the registration printing process.

8. The in-mold transfer film sheet for positioning multiple glossiness according to claim 1, wherein, On the other side of the laminating and hardening layer (6), an antistatic layer (1) is laminated on the base film (2). The material of the antistatic layer (1) is selected from one or more of inorganic antistatic agents, polymer-type conductive compositions, quaternary ammonium salt antistatic agents, and polyether antistatic agents, and the thickness is 0.1 - 3 μm.

9. A method for preparing an in-mold transfer film sheet for positioning multiple gloss levels according to any one of claims 1 to 8, characterized in that, This method includes the following steps: S1. Preparation of in-mold transfer release films with multiple gloss levels S11. Coating a release layer on one side of the base film (2); S12. Coating a UV material on the release layer and curing it using ultraviolet light irradiation to form a hardening layer (6); S13. Coating a connecting layer (7) on the hardening layer (6) to obtain an in-mold transfer release film with multiple gloss levels; S2. Preparation of in-mold transfer film sheets with multiple gloss levels S21. Processing an ink combination layer (8) on the connecting layer (7) of the release film; S22. Coating an adhesive layer (9) on the ink combination layer (8); S23. Fully curing the film sheet to obtain an in-mold transfer film sheet with multiple gloss levels.

10. An application of an in-mold transfer film sheet for positioning multiple gloss levels as described in any one of claims 1 to 8, characterized in that, The film sheet is applied to an in-mold transfer molded part with multiple gloss levels. Using the processing method of the in-mold transfer process, part of the coating of the in-mold transfer film sheet is transferred onto the resin layer (10). During the injection molding of the in-mold transfer, the base film (2) is peeled off together with the waste film sheet (16), and the remaining part of the coating of the in-mold transfer film sheet is connected to the resin layer (10) through the adhesive layer (9). The formed bright gloss surface and matte gloss surface are placed on the surface of the molded part to obtain the molded part.

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