JP5220535B2 - Transfer sheet - Google Patents

Description

 The present invention relates to a transfer sheet, and more particularly to a long transfer sheet used when a pattern is continuously applied to the surface of a resin molded product.

 When creating a decorative molded product in which a decoration is added to the surface of a resin molded product such as a communication device such as a mobile phone or an automobile exterior part, a simultaneous molding and transfer apparatus may be used as the manufacturing method. Below, the method to produce a decorative molded product with a shaping | molding simultaneous transfer apparatus is demonstrated.

  FIG. 13 is a perspective view when a long transfer sheet is wound in a roll shape, FIG. 14 is a cross-sectional view taken along the line XIV-XIV of the transfer sheet shown in FIG. 13, and FIG. It is sectional drawing of a shaping | molding simultaneous transcription | transfer apparatus when producing a decorative molded product using a elongate transfer sheet.

  Referring to FIGS. 13 and 14, a long transfer sheet 40 is composed of a base sheet 21, a design layer 22, and an adhesive layer 30, wound in a roll shape and used.

The base sheet 21 is a base material for holding the design layer 22 and the adhesive layer 30 on the sheet. The design layer 22 is a layer for decorating the surface of the molded resin, and the adhesive layer 30 is formed by the design layer 22. When decorating the surface of the molding resin, it is a layer that bonds the design layer 22 and the molding resin.

  Referring to FIG. 15, the simultaneous molding and transfer device 50 includes a feeding device 60, an injection mold 70, and a winding device 80.

  The feeding device 60 is constituted by a feeding roller 61 and an arbitrary number of guide rollers 62 and 63, and in the device, a long transfer wound in a roll shape as shown in FIG. The sheet 40 is installed on the feed roller 61.

  The injection mold 70 is composed of a fixed mold 71 and a movable mold 72. The movable mold 72 can move to a direction close to or away from the fixed mold 71 and can be in a mold closed state or a mold open state. After the transfer sheet 40 is disposed in a cavity space formed by the cavity surfaces of the fixed mold 71 and the movable mold 72, the molten resin can be injected.

  The winding device 80 is a device for winding the transfer sheet 40 after injecting molten resin into the injection mold 70, and a winding roller 81 for winding the transfer sheet 40 sent into the winding device 80. And a plurality of guide rollers 82, 83, 84, 85, 86.

When a decorative molded product is produced using the molding simultaneous transfer device 50 configured as described above, the design layer 22 of the transfer sheet 40 is injected from the feed roller 61 through the guide rollers 62 and 63 to the injection mold 70. Then, the injection mold 70 is clamped. After injecting the molten resin into the injection mold 70 to obtain an integrated molded product in which the transfer sheet 40 and the molten resin are integrated, the fixed mold 71 and the movable mold 72 of the injection mold 70 are molded. While opening, only the base sheet 21 portion of the transfer sheet 40 is peeled from the integrally molded product. Thereby, a decorative molded product in which a portion other than the base sheet 21 portion of the transfer sheet 40 is transferred to the molding resin can be obtained (for example, see Patent Document 1).

  Since the transfer sheet 40 used in the simultaneous molding and transferring apparatus 50 is wound in a roll shape, the design layer 22 and the adhesive layer 30 are substantially shielded from the outside air by the transfer sheet 40 wound thereon. As a result, even if the long transfer sheet 40 is rolled and stored, the volatile components contained in the pattern layer 22 and the adhesive layer 30 are hardly evaporated during that time. The adhesive layer 30 retains the original flexibility formed on the base sheet 21. However, as shown in FIG. 13, the design layer 22 and the adhesive layer 30 are slightly in contact with the outside air X through the end surface in the short direction of the transfer sheet 40 wound in a roll shape. If the transfer sheet 40 is stored for a long period of time after the scale-shaped transfer sheet 40 is wound into a roll, the volatile components contained in the adhesive layer 30 and the design layer 22 are stored during the storage. The pattern layer 22 and the adhesive layer 30 are completely evaporated and lose their flexibility.

Then, in the step of integrating the transfer sheet 40 and the molten resin , which is one of the steps of creating a decorative molded product using the transfer sheet 40 in the molding simultaneous transfer device 50, the mold of the injection mold 70 is used. The pattern layer 22 cannot follow flexibly according to the change rate of the mold shape, and when the molten resin is injected into the injection mold 70, cracks and cracks occur in the pattern layer 22. As a result, the decorative molded product created using the transfer sheet 40 also has the problem that the cracks and cracks are transferred and the design of the created decorative molded product is lowered.

  The present invention has been made to solve the above-described problems. Even when a long transfer sheet is prepared and stored for a long time, the pattern layer and the adhesive layer are stored during storage. Even when creating a decorative molded product using a transfer sheet that has been stored for a long time after it has been created, each layer constituting the transfer sheet is completely dried and its flexibility is suppressed. An object of the present invention is to provide a transfer sheet in which cracks and cracks are unlikely to occur in each layer constituting the transfer sheet such as a design layer and an adhesive layer in the course of its production.

  In order to achieve the above object, the invention described in claim 1 is a long transfer sheet, comprising two anti-caking layers formed continuously independently in the longitudinal direction of the base sheet, and At least a design layer formed inside the two anti-caking layers, and the thickness of the anti-caking layer is the same as or thicker than that of the design layer.

  With this configuration, when a long transfer sheet is rolled up in a roll shape, the anti-caking layer comes into contact with the base sheet portion of the transfer sheet rolled up thereon.

  With this configuration, when a long transfer sheet is rolled up in a roll shape, the contact area between the anti-caking layer and the base sheet portion of the transfer sheet wound thereon can be increased.

The invention according to claim 2 is the invention according to claim 1 , wherein the anti-caking layer is made of the same material as the pattern layer.

  If comprised in this way, the ink used for the solidification prevention layer formed on a base sheet and the design layer which is one component of a design layer can be made the same.

  As described above, according to the first aspect of the present invention, when a long transfer sheet is rolled up in a roll shape, the anti-caking layer is in contact with the base sheet portion of the transfer sheet wound thereon. Thus, the rate at which the design layer is exposed to the outside air can be reduced.

In the invention of claim 2 , in addition to the effect of the invention of claim 1 , the same ink may be used for the pattern layer formed on the base sheet and the anti-caking layer. When the anti-caking layer and the pattern layer are formed using a printing method, they can be formed at the same time using the same plate.

  Embodiments according to the present invention will be described below in more detail with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative positions, etc. of the members and parts described in the embodiments of the present invention are not intended to limit the scope of the present invention only to those unless otherwise specified. It is merely an illustrative example.

  FIG. 1 is a plan view of a transfer sheet 20 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of the transfer sheet 20 shown in FIG. Referring to FIGS. 1 and 2, in the transfer sheet 20 of the present invention, at least a design layer 22 and a solidification preventing layer 23 are formed on a base sheet 21. Further, at least two anti-caking layers 23 are continuously formed in the longitudinal direction of the base sheet 21, and the design layer 22 is inside the two anti-caking layers formed and is formed on the base sheet. It is formed in the longitudinal direction.

  The base sheet 21 is for supporting the design layer 22 and the anti-caking layer 23 on the sheet and is made of a synthetic resin or the like. The material of the base sheet 21 is a resin sheet such as polypropylene resin, polyethylene resin, polyamide resin, polyester resin, acrylic resin, polyvinyl chloride resin, metal foil such as aluminum foil or copper foil, glassine paper In addition, a cellulose sheet such as coated paper or cellophane, or a composite of each of the above-mentioned sheets, such as a substrate sheet having a releasability, can be used as a base sheet of a normal transfer sheet.

  The pattern layer 22 is a layer that decorates the surface of the molding resin when it is transferred from the transfer sheet 20 to the molding resin after the simultaneous molding transfer, and is intermittently formed in the longitudinal direction of the base sheet 21. As a material of the pattern layer 22, a resin such as a polyvinyl resin, a polyamide resin, a polyacrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, and an alkyd resin is used as a binder. Colored inks containing various color pigments or dyes as colorants may be used. In the case of forming a metal color, a pearl pigment in which titanium oxide is coated on metal particles such as aluminum, titanium, bronze, or mica can be used.

  As a method for forming the pattern layer 22, a normal printing method such as an offset printing method, a gravure printing method, a screen printing method, or the like may be used. In particular, the offset printing method and the gravure printing method are suitable for performing multicolor printing and gradation expression. In the case of a single color, a coating method such as a gravure coating method, a roll coating method, or a comma coating method may be employed.

  The pattern layer 22 may be made of a metal thin film or a combination of a printed film and a metal thin film. The metal thin film is formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like. Metals such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used depending on the metallic luster color to be expressed.

  Examples of the forming method in the case of forming a metal thin film on a part include a water solution method and an alkali method.

  With the water-soluble method, a water-soluble resin layer is partially formed before forming a metal thin film, and after vapor deposition, the water-soluble resin layer and unnecessary metal thin film portions formed thereon are removed by washing with water. This is a method of forming a metal thin film. Here, examples of the material for the water-soluble resin layer include inks containing a water-soluble resin typified by polyvinyl alcohol, starch, algide, epoxy, polyurethane and the like as a binder. Examples of the forming method include a gravure printing method, a flexographic printing method, and a screen printing method.

  The alkali method is a method in which after forming a metal thin film, an alkali-resistant resin layer is partially formed on the metal thin film, and the metal thin film is partially formed by subsequent alkali cleaning. Here, the material of the alkali-resistant resin layer includes vinyl chloride-vinyl acetate copolymer. Examples of the method for forming the alkali-resistant resin layer include coating methods such as gravure coating, roll coating, and comma coating, printing methods such as gravure printing, and screen printing.

  At least two solidification preventing layers 23 are continuously formed in the longitudinal direction of the base sheet 21. Moreover, if it is formed in this way, the shape is not particularly limited. Further, the solidification preventing layer 23 may be formed so as to be in contact with the design layer 22 or may be formed apart from the design layer 22. The material and forming method used for the solidification preventing layer 23 can be performed in the same manner as the pattern layer 22.

  Further, when the anti-caking layer 23 is made of the same material as the design layer 22, the same ink can be used for the anti-caking layer 23 and the design layer 22. 23 and the design layer 22 can be created at the same time using the same plate when the printing method is used.

  As a result, the anti-caking layer 23 and the design layer 22 can be formed at a time, so that the transfer sheet 20 of the present invention can be formed with high productivity.

  Furthermore, the adhesive layer 30 may be formed on the design layer 22, the anti-caking layer 23, and other layers as necessary. When the transfer sheet 20 is used to decorate the surface of the molding resin, the adhesive layer 30 bonds the layers constituting the transfer sheet 20 such as the design layer 22 and the anti-caking layer 23 to the molding resin. As the adhesive layer 30, a heat-sensitive or pressure-sensitive resin suitable for the material to be decorated is used as appropriate. For example, when the material to be decorated is an acrylic resin, an acrylic resin may be used.

  If the material to be decorated is polyphenylene oxide / polystyrene resin, polycarbonate resin, styrene copolymer resin, or polystyrene blend resin, acrylic resin, polystyrene resin, polyamide having affinity with these resins A series resin or the like may be used. Furthermore, when the material to be decorated is a polypropylene resin, chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, and coumarone indene resin can be used. Examples of the method for forming the adhesive layer 30 include a coating method such as a gravure coating method, a roll coating method, and a comma coating method, a printing method such as a gravure printing method, and a screen printing method.

  Furthermore, if necessary, a hard coat layer 31 may be formed between the base sheet 21 and the anti-caking layer 23 and the design layer 22 formed thereon. The hard coat layer 31 is a layer disposed on the surface of the decorative molded product when the base sheet 21 is peeled off from the molding resin after the transfer, and is fixed to protect the design decorated on the design layer 22. It is a layer having the above hardness.

  Examples of the material of the hard coat layer 31 include ionizing radiation curable resins such as cyanoacrylate and urethane acrylate, and thermosetting resins such as acrylic and urethane, but are not particularly limited.

  Furthermore, a release layer 32 may be provided between the base sheet 21 and the hard coat layer 31 in order to improve the peelability of the base sheet 21 as necessary. The release layer 32 is a layer that is released from the hard coat layer 31 together with the base sheet 21 when the base sheet 21 is peeled off from the transfer sheet 20 after simultaneous molding and transfer. As the material of the release layer 32, melamine resin, silicone resin, fluorine resin, cellulose derivative, urea resin, polyolefin resin, paraffin resin, and composites thereof can be used. Examples of the method for forming the release layer 32 include a coating method such as a roll coating method and a spray coating method, a printing method such as a gravure printing method, and a screen printing method.

  Furthermore, you may form the anchor layer 33 between the design layer 22 or / and the solidification prevention layer 23, and the hard-coat layer 31 as needed. The anchor layer 33 is a layer that improves the interlayer adhesion of each of the above layers. As the material of the anchor layer 33, two-component cured urethane resin, thermosetting urethane resin, melamine resin, cellulose ester resin, chlorine-containing rubber resin, chlorine-containing vinyl resin, acrylic resin, epoxy resin, vinyl A copolymer resin may be used. Examples of the method for forming the anchor layer 33 include a coating method such as a gravure coating method, a roll coating method, and a comma coating method, a printing method such as a gravure printing method, and a screen printing method.

  Here, the details of the transfer sheet 20 described above will be described.

  FIG. 3 is a perspective view when the transfer sheet 20 shown in FIG. 1 is rolled up. 4 is an enlarged view of a cross section when the transfer sheet 20 shown in FIG. 3 is cut along the line IV-IV. FIG. 5 is a modification of the transfer sheet 20 shown in FIG.

  Referring again to FIG. 1 and FIG. 2, in the transfer sheet 20 of the present invention, two anti-caking layers 23 are independently formed continuously in the longitudinal direction of the base sheet 21, and the two anti-caking layers are formed. The pattern layer 22 is intermittently formed in the space formed by the layer 23.

  Further, in the relationship between the design layer 22 and the anti-caking layer 23, the transfer sheet 20 of the present invention is configured such that the thickness of the anti-caking layer 23 is larger than that of the design layer 22.

  If comprised in this way, with reference to FIG. 3, when the transfer sheet 20 is wound in roll shape, the part in which the solidification prevention layer 23 was formed becomes thickest in the transfer sheet 20 wound in roll shape. Then, the winding force generated when the transfer sheet 20 is rolled up is concentrated on only the portion where the anti-caking layer 23 is formed, and is formed on the anti-caking layer 23. The adhesive layer 30a is pressed against the base sheet 21a of the transfer sheet 20 wound thereon.

  As a result, referring to FIG. 4, the anti-caking portion 25 formed by the anti-caking layer 23 and the adhesive layer 30a, and the space A formed by the base sheet 21a and the adhesive layer 30 are sealed and hardly contact with the outside air. Become.

  Thereby, after creating the transfer sheet 20, the design layer 22 and the adhesive layer 30 formed thereon can be prevented from drying and the flexibility thereof being reduced. When creating a decorative molded product, even if a large force acts on the design layer 22 or the adhesive layer 30, the shape of the design layer 22 or the adhesive layer 30 can be changed depending on the acting force. . That is, the transfer sheet 20 of the present invention is cracked or cracked in the pattern layer 22 even when it is used for producing a decorative molded product after being stored in a roll for a predetermined time. It becomes difficult. Therefore, even if it uses, after creating the transfer sheet 20 of this invention for producing a decorative molded product after a lapse of a predetermined time, it is possible to obtain a decorative molded product excellent in design.

Referring to FIG. 10 , the transfer sheet 20 of the present invention may be formed such that the design layer 22 and the anti-caking layer 23 formed on the base sheet 21 have the same thickness. At this time, when the transfer sheet 20 is wound in a roll shape, the portion where the design layer 22 is formed and the portion where the anti-caking layer 23 is formed are thickest. Then, the winding force generated when the transfer sheet 20 is rolled up is applied to the portion where the pattern layer 22 is formed and the portion where the anti-caking layer 23 is formed. The adhesive layer 30a formed on the adhesive layer 30b and the adhesive layer 30b formed on the anti-caking layer 23 are pressed by the base sheet 21a of the transfer sheet 20 wound thereon.

As a result, the space formed by the anti-solidification layer portion 25 constituted by the anti-solidification layer 23 and the adhesive layer 30, the design layer portion 26 constituted by the design layer 22 and the adhesive layer 30a, the base sheet 21a, and the adhesive layer 30. D is sealed and hardly comes into contact with outside air.

  As a result, the design layer 22 and the adhesive layer 30b formed thereon can be prevented from drying and the flexibility thereof being lowered, so that the transfer sheet 20 is created after the transfer sheet 20 is formed. Even if it is used to create a decorative molded product after a predetermined time has elapsed after being wound into a roll, the decorative molded product obtained by the creation has excellent design properties.

Furthermore, from the viewpoint of improving the sealing property of the space A or the space D , the surface of the base sheet 21 constituting the transfer sheet 20 on the surface opposite to the surface on which the solidification preventing layer 23 is formed and the surface of the adhesive layer 30 are: It is preferable to be as smooth as possible.

When the surface of the adhesive layer and the surface of the surface opposite to the surface on which the solidification preventing layer 23 of the base sheet 21 is formed are smooth with each other, when the transfer sheet 20 of the present invention is wound in a roll shape, The adhesive layer 30 formed on the solidification preventing layer 23 and the base sheet 21a of the transfer sheet 20 wound thereon are satisfactorily adhered. As a result, outside air does not enter from the space between the adhesive layer 30 and the base sheet 21a into the space A or the space D , that is, the space where the design layer 22 is formed, and the airtightness in the space is improved. Therefore, even after a long time has passed since the transfer sheet 20 was wound into a roll, it is possible to prevent the design layer 22 and the like from drying and reducing the flexibility thereof. That is, the transfer sheet 20 can provide a decorative molded product excellent in design even when used for a long time after being wound into a roll.

  FIG. 6 is a plan view of the transfer sheet 20 according to the second embodiment of the present invention. Since the basic configuration of the transfer sheet 20 according to this embodiment is the same as that according to the first embodiment, only the differences will be described here.

  Referring to FIG. 6, in the transfer sheet 20 according to the second embodiment of the present invention, two anti-caking layers 23 are independently formed continuously in the longitudinal direction of the base sheet 21, and the two anti-caking layers are formed. In the space formed by the layer 23, the pattern layer 22 is continuously formed.

  7 is a plan view of the transfer sheet 20 of the third embodiment of the present invention, FIG. 8 is a perspective view when the transfer sheet 20 shown in FIG. 7 is wound in a roll shape, and FIG. 9 is FIG. FIG. 10 is an enlarged view of a cross section taken along the transfer sheet 20-IX line shown in FIG. 10, and FIG. 10 is a modification of the transfer sheet 20 shown in FIG.

  Since the basic configuration of the transfer sheet 20 according to this embodiment is the same as that of the transfer sheet 20 according to the first embodiment or the second embodiment of the present invention, only the differences will be described here.

  Referring to FIG. 7, in the transfer sheet 20 of the second embodiment of the present invention, a design layer 22 is intermittently formed in the longitudinal direction of the base sheet 21 at the center portion of the base sheet 21. A solidification preventing layer 23 is independently formed on the base sheet 21 so as to surround the substrate 22.

  Further, the transfer sheet 20 is configured such that the thickness of the anti-caking layer 23 is larger than that of the symbol layer 22 in the relationship between the symbol layer 22 and the anti-caking layer 23.

  8 and 9, when the transfer sheet 20 of the present invention is rolled up, it is wound on the anti-caking layer portion 25 constituted by the anti-caking layer 23 and the adhesive layer 30 a and the transfer sheet 20. The space C formed by the base sheet 21a of the transfer sheet 20 and the adhesive layer 30 is completely sealed by the presence of the anti-caking layer 23 formed in the short direction of the base sheet. Is more difficult for outside air to enter than the space A or the space B formed by being wound on the transfer sheet 20 of the first embodiment of the present invention.

  Thereby, after winding the transfer sheet 20 in a roll shape, the design layer 22 and the adhesive layer 30b formed thereon can be prevented from drying for a long time, and the flexibility thereof can be reduced. Similarly to the transfer sheet 20 of the first embodiment of the present invention, the transfer sheet 20 of the present invention provides a decorative molded product having excellent design properties even when used after a predetermined time has elapsed since it was created. be able to.

  Referring to FIG. 10, the transfer sheet 20 of the present invention may be formed such that the design layer 22 and the anti-caking layer 23 formed on the base sheet 21 have the same thickness. When the thickness of the anti-caking layer 23 is the same as the thickness of the pattern layer 22, the anti-caking layer portion 25, the base sheet 21 a, and the anchor layer 33 are formed when the transfer sheet 20 is rolled. Since the design layer 22 or the adhesive layer 30 formed in the space D is dried and its flexibility is unlikely to decrease, the transfer sheet 20 of the present invention may be used after a long time has elapsed since it was created. , Can provide decorative molded products with excellent design

  FIG. 11 is a plan view of the transfer sheet 20 according to the fourth embodiment of the present invention, FIG. 12 is a perspective view when the transfer sheet 20 shown in FIG. 11 is wound in a roll shape, and FIG. FIG. 3 is an enlarged view of a cross section when cut along the XIII-XIII line of the transfer sheet 20 shown. Since the basic configuration of the transfer sheet 20 according to this embodiment is the same as that of the transfer sheet 20 according to the first embodiment or the second embodiment of the present invention, only the differences will be described here.

  Referring to FIG. 11, the transfer sheet 20 according to the fourth embodiment of the present invention is composed of layers other than the design layer 22.

  Referring to FIG. 12, when the transfer sheet 20 of the present invention is rolled up, the anti-solidification layer portion 25 composed of the anti-caking layer 23 and the adhesive layer 30 a, the transfer sheet wound on the transfer sheet 20. The space E formed by the 20 base sheet 21a and the anchor layer 33 is less likely to come into contact with the outside air.

  As a result, the layer positioned in the space E can be dried immediately and the flexibility thereof can be prevented from being lowered. Therefore, the transfer sheet 20 is wound into a roll after it is formed. A decorative molded product obtained by transferring a layer formed in the space F even after being used after being stored for a predetermined time is excellent in design.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used in various molded products such as communication devices such as mobile phones, automobile exterior parts, automobile internal information devices, and home appliances, and is industrially useful.

It is a top view which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is a perspective view which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is a top view which shows one Example of the transfer sheet which concerns on this invention. It is a top view which shows one Example of the transfer sheet which concerns on this invention. It is a top view which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is a top view which shows one Example of the transfer sheet which concerns on this invention. It is sectional drawing which shows one Example of the transfer sheet which concerns on this invention. It is a perspective view which shows one Example of the transfer sheet which concerns on a prior art. It is sectional drawing which shows one Example of the transfer sheet which concerns on a prior art. It is sectional drawing which shows one Example of the simultaneous shaping | molding transcription | transfer apparatus based on a prior art.

Explanation of symbols

20 Transfer sheet 21 Base sheet 22 Pattern layer 23 Anti-caking layer

Claims (2)

A long transfer sheet used for decorating the surface of a resin molded product,
The transfer sheet is
A base sheet;
A plurality of pattern layers intermittently formed on the base sheet;
A solidification preventing layer formed so as to surround the plurality of design layers at a peripheral portion of the design layer on the base sheet,
A transfer sheet, wherein the anti-caking layer has a thickness equal to or greater than that of the pattern layer.   The transfer sheet according to claim 1, wherein the anti-caking layer is made of the same material as the pattern layer.

Images