JP2010241031A - Method for manufacturing decorative plastic molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a decorative plastic molded article, capable of decorating with a derivative multilayer film even it is a molded article having irregularity. <P>SOLUTION: In the method for manufacturing the decorative plastic molded article, the derivative multilayer film is formed on a flatly disposed plastic film through a vapor deposition method, and a decorative film 16 having a decorative surface is manufactured first. Next, the decorative film 16 is disposed in a mold composed of first and second mold pieces 31, 32 so that the surface on which the derivative multilayer film is formed becomes a contact surface side with molten plastic. The molten plastic 35 is pressurized and filled in the mold, and the decorative film 16 is deformed in a predetermined irregular shape under the pressure according to a mold inner surface shape. A lid 11 as the decorative plastic molded article integrated with the decorative film 16 is prepared by holding and solidifying the molten plastic 35 in the mold. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is, for example, a decorative plastic molded article formed with a dielectric thin film on the surface, which allows direct visual observation of metallic luster, which can be suitably used for car interior parts, mobile phone or camera housing outer surfaces, sanitary parts, etc. It is related with the manufacturing method.

  In order to decorate a plastic substrate with a metallic luster, a technique has been proposed in which a thin film is formed on the surface of the substrate by a film deposition method such as vacuum deposition or sputtering, and this is covered with a protective film. For example, Patent Document 1 discloses a technique in which an adhesive layer is first formed on a substrate, a metal thin film or a dielectric thin film is formed thereon, and finally a hard coat layer is formed as a protective layer. Similarly, Patent Document 2 discloses a technique in which an undercoat is applied on a synthetic resin substrate, a metal thin film is formed thereon, and then a transparent topcoat is applied thereon.

JP 2005-296841 A JP 2007-1247 A JP 2008-200701 A

In order to create various metal colors for decoration, it is preferable to use a dielectric multilayer film using a metal oxide. In addition, the IRDA communication port window of mobile phones and personal computers that transmit infrared light for infrared data communication requires infrared region transmission characteristics, but such a characteristic cannot be obtained with a metal thin film. In a design that uses a metallic color for the window portion, it is necessary to use a dielectric multilayer film.
However, since the dielectric multilayer film is generally obtained as a vapor deposition film, it is difficult to form a uniform film on a molded product with many irregularities or a curved surface. In the case of dielectric multilayer films, if the film thickness is different, the expected color development cannot be obtained or the desired spectral characteristics cannot be obtained, so it is actually impossible to produce decorative plastic molded products using dielectric multilayer films. There wasn't.
Moreover, in order to manufacture a decorative plastic molded product, a technique such as Patent Document 3 has been developed. This manufactures a decorative film that is laminated with a plastic film and decorated in a metallic color style with spectral characteristics. Using this film, it can be molded by various molding methods such as in-mold molding and insert molding into mobile phones, etc. It is what is used.
However, since the plastic film has high spreadability, the plastic film is spread and changes its color when it is strongly bent at an angled portion. Therefore, it cannot be applied to a decorative plastic molded product with a design with a deep angle.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for producing a decorated plastic molded product that can be decorated with a dielectric multilayer film even if the molded product has irregularities. There is.

In order to achieve the above object, in the invention described in claim 1, a decorative film having a surface decorated by forming a dielectric multilayer film on a flatly arranged plastic film by vapor deposition is manufactured. In the state where the decorative film is placed in the mold, the molten plastic is pressure-filled in the mold, and the decorative film is deformed into a predetermined uneven shape according to the shape of the inner surface of the mold by the pressure, The gist of the present invention is to obtain a decorative plastic molded product integrated with the decorative film by holding and solidifying the molten plastic.
With such a configuration, the decorative film on which a dielectric multilayer film having a uniform film thickness is deposited is deformed into a predetermined concavo-convex shape according to the shape of the inner surface of the mold by molten plastic introduced into the mold under pressure. Will be. Then, the plastic is integrated with the decorative film and solidified by being held in the mold as it is. Then, the decorative film is visibly exposed on the plastic surface of the molded decorative plastic molded product.
Here, the dielectric multilayer film on the decorative film is not stretchable, so even if the decorative film is strongly bent along the shape of the inner surface of the mold, the dielectric multilayer film itself generates very small cracks (microcracks). Thus, since the thickness of each layer of the dielectric multilayer film does not change with respect to the shape, the appearance color does not change in terms of decoration.

According to a second aspect of the present invention, in the first aspect of the invention, when the decorative film is disposed in the mold, at least the surface on which the dielectric multilayer film is formed is a contact surface side with the molten plastic. The gist of the arrangement is as follows.
Accordingly, the dielectric multilayer film surface is disposed and protected between the plastic film and the plastic as the base material.

In invention of Claim 3, the dielectric multilayer film was formed into a film by vapor deposition on the plastic film arrange | positioned flatly, and the decorating film by which the surface was decorated is manufactured, and the decorating film is predetermined | prescribed beforehand. Molded into a concave-convex shaped decorative film molded product, filled with molten plastic in the mold with the decorative film molded product placed in the mold, and held in the mold to solidify the molten plastic The gist is that a decorative plastic molded product integrated with the decorative film is obtained.
With such a configuration, a decorative film on which a dielectric multilayer film having a uniform film thickness is deposited is formed in advance into a decorative film molded product having a predetermined uneven shape, and therefore is placed in a mold. The molten plastic filled with is solidified by integrating with the decorative film molded product. At this time, the decorative film molded product may be arranged so that the decorative surface can be visually observed at the surface position of the plastic serving as the base material, or may be held inside the plastic. In the latter case, the plastic needs to be transparent.
As a molding method of the decorative film molded product, it can be obtained by a known molding method such as vacuum molding, pressure molding, press molding or the like.

In the invention of claim 4, in the invention of claim 3, in the case where the decorative film molded product is disposed in the mold, at least the surface on which the dielectric multilayer film is formed is a contact surface with the molten plastic The gist is to arrange it to be on the side.
Accordingly, the dielectric multilayer film surface is disposed and protected between the plastic film and the plastic as the base material.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a predetermined printing is performed on the plastic film, and a dielectric multilayer film is formed on the surface on which the printing is performed. The gist is to produce a decorative film.
According to a sixth aspect of the present invention, in the first aspect of the present invention, a dielectric multilayer film is formed on the plastic film, and predetermined printing is performed on the dielectric multilayer film. The gist is to produce a decorative film.
In these configurations, since the printing surface is on the dielectric multilayer film side, the printing surface is also protected when the dielectric multilayer film side is disposed between the plastic film and the plastic material as described above, for example. Will be.
The printing method is not particularly limited as long as it is a printing means capable of printing on a plastic film, and examples thereof include screen printing, pad printing, and ink jet printing.

The invention according to claim 7 is the invention according to any one of claims 1 to 4, wherein a dielectric multilayer film is formed on the plastic film, and a predetermined surface is formed on the back side of the film formation surface of the dielectric multilayer film. The gist is to produce a decorative film by printing.
The gist of the invention according to claim 8 is that, in the invention according to claim 7, when the printing surface side of the decorative film is exposed to the outside, a protective layer is formed on the printing surface.
Thus, it is preferable to form a protective layer on the printing surface because it is necessary to protect the printing surface. Examples of the protective layer include a hard coat film used for protecting eyeglass lenses and the like mainly composed of silicon oxide.
The hard coat film is generally formed, for example, by dipping or coating in a hard coat solution for coating, and then evaporating the solvent by a known method. The hard coat film is particularly preferably composed of an organosiloxane resin and inorganic oxide fine particles. The hard coat liquid for that purpose is prepared by dispersing (mixing) the organosiloxane resin and the inorganic oxide fine particle sol in water or an alcohol solvent.
The organosiloxane resin is preferably obtained by hydrolyzing and condensing alkoxysilane. Specific examples of the alkoxysilane include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, methyltrimethoxysilane, and ethyl silicate. These alkoxysilane hydrolysis condensates are produced by hydrolyzing the above alkoxysilane compounds alone or in combination of two or more with an acidic aqueous solution such as hydrochloric acid.
The invention according to claim 9 is the invention according to claim 1 or 3, wherein when the dielectric multilayer film side of the decorative film is exposed to the outside, a protective layer is formed on the dielectric multilayer film. Is the gist.
Also in this case, it is preferable to form a protective layer on the printing surface because it is necessary to protect the dielectric multilayer film.
According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, an adhesive layer compatible with the molten plastic is formed on the contact surface side of the decorative film with the molten plastic. This is the gist.
This improves the adhesion between the base plastic of the decorative plastic molded product and the decorative film.

Examples of the vapor deposition method in the present invention include a sputtering method, a vacuum vapor deposition method, and a vapor phase growth method.
Sputtering is a method in which argon gas particles are collided with a solid target, which is a raw material to be atomized, in a vacuum atmosphere, and target components (fine particles) that have been repelled by the impact are taken out. This is a method for forming a thin film by depositing nano-level fine particles on a substrate. In the present invention, instead of forming a film on the substrate, a monomer for thermosetting plastic or heat in a liquid phase state is used. The target component (fine particles) is taken into the resin instead of the plastic plastic substrate. It is a kind of physical vapor deposition (PVD).
The vacuum vapor deposition method is a method in which a vapor deposition material is heated and vaporized in a vacuum atmosphere to adhere to the surface of a substrate placed at a distant position, thereby forming a thin film. After all it is a kind of physical vapor deposition. Examples of the heating means include resistance heating, electron beam, high frequency induction, and laser. In the present invention, instead of forming a film on a substrate, a vaporized substance (fine particles) is taken into the resin instead of the monomer for the thermosetting plastic or the thermoplastic resin in the liquid phase instead of the substrate. Become. In addition, there is an in-gas evaporation method in which evaporation is performed in a predetermined gas atmosphere instead of vacuum.
Vapor deposition is a type of chemical vapor deposition (CVD), and the raw material gas containing the desired thin film components is supplied directly or together with the carrier gas onto the substrate heated in the reactor. In this method, a film is formed by a chemical reaction on the substrate surface or in the gas phase. The degree of vacuum is not as high as that of sputtering or sputtering. As a means for applying activation energy, a material that applies heat is basically referred to as CVD (Chemical Vapor Deposition), a method using plasma is particularly referred to as plasma CVD, and a method using high energy light is referred to as photo-CVD.

The material of the plastic used as the base material used in the present invention is not particularly limited. For example, if it is a thermoplastic plastic, a polyolefin resin such as polypropylene, polyethylene, and polystyrene, polyethylene terephthalate (PET), polybutylene terephthalate, Examples include polyester resins such as polypropylene terephthalate, polycarbonate, polyacetal resin, acrylic resin, methacrylic resin, and the like. Examples of the thermosetting plastic include phenol resin, urea resin, melamine resin, and epoxy resin.
The material of the plastic film used in the present invention is not particularly limited as long as it is a thermoplastic plastic. For example, polyolefin resins such as polypropylene, polyethylene, and polystyrene, polyethylene terephthalate (PET), polybutylene terephthalate, and polypropylene. Examples include polyester resins such as terephthalate, polycarbonate, polyacetal resin, acrylic resin, methacrylic resin, and the like.
However, polycarbonate, polyethylene terephthalate (PET), ABS, epoxy, or the like is preferably selected when adhesion strength between the resin material and the deposited film is required.
Each constituent film layer of the dielectric multilayer film used in the present invention is made of a hydrophilic or non-hydrophilic inorganic compound, for example, TiO ₂ , Ta ₂ O ₅ , ZrO ₂ , Al ₂ O ₃ , Nb _2. Examples thereof include metal oxides such as O ₅ , SiO ₂ , and MgF ₂ . The number of multilayer films to be configured and the film thickness of each layer are not particularly limited. Optical characteristics can be arbitrarily adjusted by these constituent films.

  According to the inventions described in the above claims, it is possible to manufacture a decorative plastic molded product having complicated irregularities decorated with a dielectric multilayer film.

The perspective view of the lid | cover manufactured by the method of one Example of this invention. The partially broken side view of the lid | cover of FIG. Explanatory drawing explaining the image of the layer structure of the decorating film in the printing part position of the lid | cover of FIG. The schematic diagram of the vacuum evaporation system used in an Example. It is explanatory drawing explaining the process at the time of manufacturing the lid | cover of Example 1 by the in-mold molding method, Comprising: (a) is the state which has arrange | positioned the decorating film between the molds released, (b) is a fusion | melting. A state in which plastic is injected, (c) is a state in which it is released again to take out a molded decorative plastic molded product. The partially broken side view of the other Example of the lid | cover of FIG. It is explanatory drawing explaining the process of obtaining an insert molding from a decorative film by vacuum forming, (a) is the state which has arrange | positioned the decorative film on a convex type, (b) is a decorative film by vacuum drawing. Is a deformed state, (c) is a state where the insert molded body is taken out. It is explanatory drawing explaining the process at the time of manufacturing the lid | cover of Example 2 by the insert mold molding method, Comprising: (a) is the state which has arrange | positioned the insert molded object between the molds released, (b) is a fusion | melting. A state in which plastic is injected, (c) is a state in which it is released again to take out a molded decorative plastic molded product. Explanatory drawing explaining the image of the layer structure of the decorating film of the other Example in the printing part position of the lid | cover of FIG. Explanatory drawing explaining the image of the layer structure of the decorating film of the other Example in the printing part position of the lid | cover of FIG.

Embodiments of a method for producing a decorative plastic molded product according to the present invention will be described below with reference to the drawings.
Example 1
In the first embodiment, as an example, a lid 11 for a portable information terminal as shown in FIGS. 1 and 2 is manufactured. The lid 11 as a decorative plastic molded product has a rectangular planar shape, and has a dish shape in which the entire periphery is curved in the opposite direction. A rectangular through-hole 12 is formed at a position closer to one side in the longitudinal direction from the center. On the back surface of the lid 11, a claw 13 for attaching to a housing body (not shown) is provided.
The lid 11 of Example 1 has a transparent base plastic 15 made of polycarbonate on the outer side (upper side in FIG. 2), and a decorative film 16 is disposed on the inner side (lower side in FIG. 2) of the base plastic 15. ing. In FIG. 2, the decorative film 16 is slightly thicker in the drawing.
FIG. 3 is an image of the layer structure of the decorative film 16. The decorative film 16 is printed on the back surface of a plastic film 17 made of PET with a printing portion 18 as “TOKAIOPTICAL” in FIG. 1 by screen printing, and the back surface of the plastic film 17 is printed on the printing portion 18. A dielectric multilayer film 19 is formed over the entire area. FIG. 3 schematically shows the layer structure, and the thickness ratio of each layer is not accurate. In Example 1, the surface of the decorative film 16 on which the dielectric multilayer film 19 is deposited is the base plastic 15 side.

Such a lid 11 is manufactured by the following process.
<Manufacture of decorative film>
The decorative film is manufactured by a vacuum deposition apparatus 21 as shown in the schematic diagram of FIG. A heater 23 is disposed below the inside of the housing 22 of the vacuum vapor deposition apparatus 21, and a tray 24 in which a vapor deposition material 25 is accommodated is disposed on the heater 23. A flat plastic film 17 having a predetermined size is horizontally disposed at an upper position inside the housing 22 spaced apart from the tray 24 by a predetermined distance. The printing section 18 has already been printed on the plastic film 17, and in this embodiment 1, the printing section 18 side is the vapor deposition surface. Each case 22 includes a valve 26 for introducing outside air and a pump 27 for deaeration. With such a configuration, the heater 23 is heated at a predetermined degree of vacuum, and the deposition raw material 25 is deposited. The decorative multilayer film 19 is formed by stacking vapor deposition so that predetermined color development and characteristics can be obtained.

<In-mold molding>
The case where the in-mold molding method is used to mold the lid 11 will be described based on the schematic diagrams of FIGS.
In the in-mold molding of the first embodiment, the first mold piece 31 and the second mold piece 32 constitute a mold (mold). The inner surface of the first mold piece 31 is molded on the back side of the lid 11, and the inner surface of the second mold piece 32 is molded on the surface side of the lid 11. The second mold piece 32 is connected to the nozzle 34 a of the injection molding machine 34. The molten plastic 35 injected from the injection port 34a of the injection molding machine 34 passes through the passage 36 of the second mold piece 32 and is formed in the cavity C by joining (mold clamping) of both mold pieces 31 and 32. Filled in.
Next, the molding process of the lid 11 by the in-mold molding method will be described.
As shown in FIG. 5A, the decorative film 16 is placed so that the dielectric multilayer film 19 side faces the second mold piece 32 side (passage 36 side) in a state in which the mold pieces 31 and 32 are separated from each other. It arrange | positions between the metal mold | die pieces 31 and 32. FIG. Next, as shown in FIG. 5 (b), the first mold piece 31 is moved up and clamped, and in synchronism with this, a predetermined amount of the injection molding machine 34 passes through the nozzle 34a and the passage 36, and the molten plastic. 35 is injected into the cavity C. The decorative film 16 is deformed along the inner surface of the first mold piece 31 by the heat and pressure during the injection. When the molten plastic 35 is filled in the cavity C, the pressure is maintained for a predetermined time, and when the molten plastic 35 is solidified to become the base plastic 15, as shown in FIG. A molded product of the lid 11 can be obtained by opening the mold and removing the mold. In the demolding stage, since there is a decorative film 16 portion protruding from the plastic burr and the outer shape of the plastic, these are removed as the final product.

The lid 11 manufactured in this way is viewed from the front side through the transparent base plastic 15 so that the printing part 18 floats against the background of the metal color of the decorative film 16. At this time, the decorative film 16 is deformed according to the shape of the inner surface of the first mold piece 31, but the appearance color does not change.
In addition, since the printing unit 18 and the dielectric multilayer film 19 are protected in a sealed state by the plastic film 17 and the base plastic 15 as a layer structure, there is no risk of deterioration or damage.

(Example 2)
In the second embodiment, unlike the first embodiment, as shown in FIG. 6, a decorative film 16 is disposed on the outer surface (upper side in FIG. 6) of the base plastic 15 in the lid 11. The second embodiment also has an appearance as shown in FIG.
The decorative film 16 of Example 2 has the same layer configuration as that of Example 1.

Such a lid 11 is manufactured by the following process.
<Manufacture of decorative film>
This is the same as in the first embodiment.
<Vacuum forming>
In Example 2, the flat decorative film 16 is not in-molded as it is, but an insert mold that is molded in advance by molding a surface shape of the lid 11 (hereinafter referred to as an insert molding) into the mold. A molding method was used. Since the degree of deformation of the decorative film 16 is larger in Example 2 than in Example 1, this method was adopted.
In the second embodiment, a vacuum forming method was used to preliminarily shape the surface shape of the lid 11. Based on the schematic diagrams of FIGS. 7A to 7C, vacuum forming for forming the insert-molded body 40 will be described.
As shown in FIGS. 7A to 7C, a convex mold 42 corresponding to the surface shape of the lid 11 is prepared on the bed 41. A plurality of suction passages 43 are appropriately formed in the convex mold 42 and the bed 41. A vacuum pump 44 is disposed below the bed 40.
Next, steps required until the insert molded body 40 is obtained will be described.
First, as shown in FIG. 7A, the decorative film 16 heated by a heater (not shown) is disposed above the convex mold 42 so that the dielectric multilayer film 19 side faces downward, and surrounds the convex mold 42. Then, as shown in FIG. 7B, the decorative film 16 is deformed along the convex mold 42 by evacuating the pump 44 by driving the pump 44 (an insert molded body is formed). Finally, as shown in FIG. 7C, the insert molded body 40 made of the decorative film 16 is taken out and the burrs are removed.

<Insert molding>
Based on the schematic diagrams of FIGS. 8A to 8C, the case where the insert molding method is used to mold the lid 11 will be described.
In the insert mold molding of the second embodiment, the first mold piece 45 and the second mold piece 46 constitute a mold (mold). The inner surface of the first mold piece 45 is molded on the surface side of the lid 11, and the inner surface of the second mold piece 46 is molded on the back surface side of the lid 11. The second mold piece 46 is connected to a nozzle 47 a of an injection molding machine 47. The inner surface shape of the first mold piece 45 coincides with the convex mold 42. The molten plastic 48 injected from the injection port 47a of the injection molding machine 47 passes through the passage 49 of the second mold piece 46, and is formed inside by a cavity C formed by joining (mold clamping) of both mold pieces 45, 46. Filled in.
Next, the molding process of the lid 11 by the insert molding method will be described.
As shown in FIG. 8A, the insert molded body 40 is placed so that the dielectric multilayer film 19 side faces the second mold piece 32 side (passage 36 side) in a state in which both mold pieces 45 and 46 are separated from each other. 1 mold piece 45. Next, as shown in FIG. 8B, the first mold piece 45 is moved up and clamped, and in synchronization with this, a predetermined amount of molten plastic is injected from the injection molding machine 47 through the nozzle 47a and the passage 49. 48 is injected into cavity C. When the molten plastic 48 is filled in the cavity C, the pressure is maintained for a predetermined time, and when the molten plastic 48 is solidified to become the base plastic 15, as shown in FIG. A molded product of the lid 11 can be obtained by opening the mold and removing the mold. In the demolding stage, since there is a decorative film 16 portion protruding from the plastic burr and the outer shape of the plastic, these are removed as the final product.

The lid 11 manufactured in this way is visually observed on the surface of the transparent base plastic 15 so that the printing part 18 floats against the background of the metal color of the decorative film 16. At this time, the decorative film 16 is formed in advance into the insert molding 40, but the appearance color does not change. Further, if the appearance of the insert molded body 40 is damaged, the insert molded body 40 can be checked and eliminated before the lid 11 is molded by the insert mold molding method.
In addition, since the printing unit 18 and the dielectric multilayer film 19 are protected in a sealed state by the plastic film 17 and the base plastic 15 as a layer structure, there is no risk of deterioration or damage.

(Other examples)
-In the decorative film 16 of the said Example, the printing part 18 was formed previously in the plastic film 17, and the dielectric multilayer film 19 was vapor-deposited after that. However, as shown in FIG. 9, the dielectric multilayer film 19 may be vapor-deposited first, and the printing part 18 may be formed thereon.
In the decorative film 16 of each of the above embodiments, the printing unit 18 and the dielectric multilayer film 19 are formed on the same surface of the plastic film 17, but the printing unit is formed on the front and back surfaces of the plastic film 17 as shown in FIG. 18 and the dielectric multilayer film 19 may be formed on different surfaces. In this case, according to the above molding method, one of the printed portion 18 and the dielectric multilayer film 19 is exposed to the outside of the lid 11, and in this case, at least the hard coat film is formed on the exposed surface side. It is preferable to apply a protective film such as
An adhesive layer may be formed to improve the adhesion between the base plastic 15 and the decorative film 16, that is, on the front or back surface of the decorative film 16 in contact with the molten plastic 35, 48. Good.
In the second embodiment, vacuum molding is used to mold the insert molded body 40. However, other molding methods may be used.
In addition, it is free to implement in a modified form without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 16 ... Decorating film, 17 ... Plastic film, 19 ... Dielectric multilayer film, 35, 48 ... Molten plastic, 31, 45 ... 1st metal mold | die part of a mold, 32, 46 ... Part of a mold A second mold piece.

Claims (10)

A dielectric multilayer film is formed on a flat plastic film by vapor deposition to produce a decorative film with a decorated surface, and the decorative film is placed in the mold in the mold. The molten plastic is pressurized and filled, and the decorative film is deformed into a predetermined concavo-convex shape according to the shape of the inner surface of the mold, and held in the mold to solidify the molten plastic. A method for producing a decorative plastic molded product, characterized in that an integrated decorative plastic molded product is obtained. 2. The additive according to claim 1, wherein when the decorative film is arranged in the mold, the decorative film is arranged so that at least the surface on which the dielectric multilayer film is formed is on the contact surface side with the molten plastic. Manufacturing method for decorative plastic molded products. A dielectric multilayer film is formed on a flat plastic film by vapor deposition to produce a decorative film with a decorated surface, and the decorative film molded product having a predetermined uneven shape is formed in advance. In the state in which the decorative film molded product is placed in the mold, the molten plastic is filled in the mold, and the molten plastic is solidified by holding in the mold to be integrated with the decorative film. A method for producing a decorated plastic molded product, characterized in that a decorated plastic molded product is obtained. 4. When arranging the decorative film molded product in the mold, it is arranged so that at least the surface on which the dielectric multilayer film is formed is on the contact surface side with the molten plastic. Manufacturing method for decorative plastic molded products. 5. The decorative film is manufactured by performing predetermined printing on the plastic film, and forming a dielectric multilayer film on the surface on which the printing is performed. Manufacturing method of decorative plastic molded products. 5. The decorative multilayer film is manufactured by forming a dielectric multilayer film on the plastic film and performing predetermined printing on the dielectric multilayer film. Manufacturing method of decorative plastic molded products. The dielectric multilayer film is formed on the plastic film, and a predetermined printing is performed on the back side of the film formation surface of the dielectric multilayer film to produce a decorative film. The manufacturing method of the decorative plastic molded product in any one. The method for producing a decorative plastic molded product according to claim 7, wherein a protective layer is formed on the printing surface when the printing surface side of the decorative film is exposed to the outside. The decorative plastic molded product according to claim 1 or 3, wherein a protective layer is formed on the dielectric multilayer film when the dielectric multilayer film side of the decorative film is exposed to the outside. Method. The decorative plastic molded product according to any one of claims 1 to 9, wherein an adhesive layer compatible with the molten plastic is formed on a side of the decorative film that contacts the molten plastic. Manufacturing method.

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