JP2005119315A - Mold for molding decoration sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding a decoration sheet, which is free from adhesion on the mold surface of the decoration sheet caused by heat or mold clamping force. <P>SOLUTION: The mold for molding the decoration sheet is intended for fabricating the decoration sheet having at least a decoration layer 2 formed on a base sheet 1 while holding it pushed to the mold surface by a clamp member 3; wherein an average surface roughness Ra of a clamp surface in contact with the decoration sheet or a corresponding mold surface ranges from 0.001 to 30.0×10<SP>-3</SP>mm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a decorative sheet molding die.

  Conventionally, there has been a decorative sheet in which a decorative layer having various patterns is formed on a base sheet.

  The decorative sheet is usually used by being deformed from a flat shape to a desired three-dimensional shape. There are the following two examples of specific methods for deforming the decorative sheet into a three-dimensional shape.

  (1) The decorative sheet is pressed against the mold surface around the female recess with a clamp material, heated and softened, the decorative sheet is vacuum sucked and sucked into the female recess, and then the three-dimensional shape A method of forming the decorative sheet by cooling it to room temperature.

  (2) The decorative sheet heated and softened is sandwiched between a male mold and a female mold of an injection mold, and clamped and pushed into the female concave portion by the male convex portion, or The decorative sheet at room temperature is sandwiched between the male mold and female mold of the injection mold, and the decorative sheet is softened by the hot pressure of the injected molten resin and pushed into the female mold recess to decorate. A method of forming a sheet by cooling the sheet to room temperature.

  However, when the decorative sheet is heated, adhesion occurs on the base sheet side or the decorative layer side of the decorative sheet due to heat, and the part where the adhesion occurs contacts the mold surface or the clamp surface When the external force is applied by pressing the clamp material (1) or clamping the mold (2), the adhesion becomes stronger. For this reason, when the decorative sheet is pulled away from the mold surface or the clamp surface corresponding to the mold surface, a part of the base sheet or the decorative layer constituting the decorative sheet is agglomerated or delaminated, resulting in a defect in the decorative sheet. Or cohesive fracture pieces remain in the female mold (see FIG. 3).

  Note that “adhesion occurs” means that the plasticizer contained in the decorative sheet material elutes on the surface due to heat and becomes sticky, or the decorative sheet softens due to heat. It means that it tends to adhere to the mold surface. Moreover, the magnitude | size of the adhesiveness with respect to a metal mold | die surface differs on the base sheet side and the decoration layer side. The reason is that the content of the plasticizer of the resin used, the melting point (Tm) of the resin used, and the softening temperature are different between the base sheet and the decorative layer.

  Accordingly, an object of the present invention is to provide a decorative sheet-molding mold with as few problems as described above.

  The present invention is as follows.

As described in claim 1, in a state where a decorative sheet having at least a decorative layer formed on a base sheet is pressed against a mold surface with a clamp material and fixed, and a decorative layer formed on the decorative sheet; A mold for decorative sheet molding for molding while maintaining positional accuracy with the mold shape, and an average surface roughness Ra of a clamp surface that contacts the decorative sheet or a mold surface corresponding thereto The decorative sheet-molding mold was 0.01 to 30.0 × 10 ⁻³ mm.

  As described in claim 2, the decorative sheet molding die may be a decorative sheet molding die which is a vacuum molding die for resin molded products.

The decorative sheet formed on the decorative sheet in a state where the decorative sheet having at least the decorative layer formed on the base sheet is sandwiched between the male mold and the female mold and fixed. A decorative sheet-forming mold for molding while maintaining the positional accuracy of the decorative layer and the mold shape, and at least a male mold or a female mold that comes into contact with the decorative sheet when the decorative sheet is sandwiched One mold surface may have an average surface roughness Ra of 0.01 to 12.5 × 10 ⁻³ mm, and may be a decorative sheet molding mold.

  According to a fourth aspect of the present invention, the decorative sheet molding die may be an injection mold for a resin molded product.

The decorative sheet-forming mold of the present invention is a decorative sheet formed on a decorative sheet in a state where a decorative sheet having at least a decorative layer formed on a base sheet is pressed against a mold surface with a clamp material and fixed. A decorative sheet molding mold for molding with a positional accuracy between the decorative layer and the mold shape, the average surface roughness of the clamp surface in contact with the decorative sheet or the mold surface corresponding thereto Ra is 0.01-30.0 × 10 ⁻³ mm.

The decorative sheet molding die of the present invention is a decorative sheet in a state where a decorative sheet having at least a decorative layer formed on a base sheet is sandwiched between a male mold and a female mold and fixed. A mold for decorative sheet molding for molding while maintaining the positional accuracy between the decorative layer formed on the mold and the mold shape, and a male mold that comes into contact with the decorative sheet when the decorative sheet is sandwiched Alternatively, the average surface roughness Ra of at least one mold surface of the female mold is 0.01 to 12.5 × 10 ⁻³ mm.

  Therefore, in the process in which the decorative sheet is heated, adhesion occurs on the surface of the decorative sheet on the base sheet side or the surface of the decorative layer side by heat, and even if an external force is applied by the clamping material or mold clamping, The decorative sheet does not adhere to the mold surface. Therefore, when the decorative sheet is pulled away from the mold surface, a part of the base sheet or the decorative layer constituting the decorative sheet is cohesive failure or delamination, cohesive failure pieces remain in the molding die, The decorative sheet is not lost.

The decorative sheet-forming mold of the present invention is a decorative sheet formed on a decorative sheet in a state where a decorative sheet having at least a decorative layer formed on a base sheet is pressed against a mold surface with a clamp material and fixed. A decorative sheet molding mold for molding with a positional accuracy between the decorative layer and the mold shape, the average surface roughness of the clamp surface in contact with the decorative sheet or the mold surface corresponding thereto Ra is 0.01-30.0 × 10 ⁻³ mm.

The decorative sheet molding die of the present invention is a decorative sheet in a state where a decorative sheet having at least a decorative layer formed on a base sheet is sandwiched between a male mold and a female mold and fixed. A mold for decorative sheet molding for molding while maintaining the positional accuracy between the decorative layer formed on the mold and the mold shape, and a male mold that comes into contact with the decorative sheet when the decorative sheet is sandwiched Alternatively, the average surface roughness Ra of at least one mold surface of the female mold is 0.01 to 12.5 × 10 ⁻³ mm.

  The decorative sheet forming mold includes a female mold 5 having a concave portion 6 and a male mold 4 having a convex portion 7 as shown in FIGS. 1 and 2, and press molding a decorative sheet 21 by pressing. There is a mold 8 for use. Further, there is a vacuum molding die 9 for a resin molded product having a female die 5 having a recess 6 as shown in FIGS. A vacuum suction hole 22 is formed in the vacuum molding die 9 for a resin molded product. A two-shaped clamp member 3 is attached to the mold surface. The clamp member 3 may have a frame shape as shown in FIG. In addition to the vacuum molding die 9 for resin molded products, the decorative sheet molding die for molding the decorative sheet 21 in a state in which the decorative sheet 21 is pressed and held on the mold surface by the clamp material 3, For example, there are pressure forming (including ultra-high pressure forming) molds, blow molding molds, hydroforming molds and the like.

  In addition, there is an injection mold 10 for a resin molded product composed of a female mold 5 and a male mold 4 each having a recess 6 as shown in FIG. A resin injection port 11 is formed in the female mold 5.

  Examples of the method for setting the average surface roughness Ra of the mold surface to the above values include buffing, polishing, file finishing, electric discharge, horn finishing, grinding, tumbling, rolling and the like.

  The place where the average surface roughness Ra is set to the above-described numerical value is a clamp face in contact with the decorative sheet 21 or a place corresponding to the clamp face.

  For example, when using the vacuum molding die 9 for resin molded products, it is a portion that contacts the die and the clamp material 3 when the decorative sheet 21 is placed and clamped in the die.

  When the injection mold 10 for resin molded products is used, the decorative sheet 21 is placed between the male mold 4 and the female mold 5, and when the molding machine is clamped, the decorative sheet 21 becomes the male mold 4 and the female mold. It is a portion sandwiched by the mold 5.

  The place where the average surface roughness Ra is set to the above-described numerical value is at least a clamp face that comes into contact with the decorative sheet or a mold face corresponding thereto, and may be formed at other places.

  In this invention, about the decorating sheet 21 which changed the kind of resin of the base sheet 1, the decorating sheet 21 is pressed against the mold surface by the clamp material 3 and held using the vacuum molding die 9 for resin molded products. For the case, the relationship between the coefficient of dynamic friction between the average surface roughness Ra of the mold surface and the decorative sheet 21 and the adhesion preventing effect of the decorative sheet 21 is measured, and the applicable range of the average surface roughness Ra is selected. did.

  Further, when the decorative sheet 21 is sandwiched between the male mold 4 and the female mold 5 using the injection mold 10 for resin molded products, the average surface roughness Ra of the mold surface and the decorative sheet 21 are also included. The relationship between the coefficient of dynamic friction and the adhesion preventing effect of the decorative sheet 21 was measured, and the applicable range of the average surface roughness Ra was selected.

As a result, when the vacuum molding die 9 for resin molded products is used, the average surface roughness Ra of the mold surface in contact with the ink layer 14 of the decorative sheet 21 is 30 × 10 ⁻³ mm (30 μm) or less. If the mold surface was processed smoothly until, the adhesion preventing effect was confirmed in all the decorated sheets 21 tested (see Table 1). In particular, when the average surface roughness Ra was 6.3 × 10 ⁻³ mm (6.3 μm) or less, adhesion was lost in all the decorated sheets 21 tested (see Table 1).

  The dynamic friction coefficients between the mold surface and the decorative sheet 21 at this time were all 2.4 or less (see Table 3), although they differ depending on the resin of the decorative sheet 21.

On the other hand, when the injection mold 10 for resin molded products is used, the average surface roughness Ra of the mold surface in contact with the ink layer 14 of the decorative sheet 21 is 12.5 × 10 ⁻³ mm (12. If the mold surface was processed smoothly until it became 5 μm or less, the adhesion preventing effect was confirmed in all the decorative sheets 21 tested (see Table 2). In particular, when the average surface roughness Ra of the surface portion was set to 1.6 × 10 ⁻³ mm or less, adhesion did not occur in all the decorated sheets 21 tested (see Table 2).

  The dynamic friction coefficient between the mold surface and the decorative sheet 21 at this time was 1.0 or less in all cases, although it differs depending on the resin of the decorative sheet 21 (see Table 4).

  The average surface roughness Ra is obtained by subtracting the average line (waviness curve) from the surface cross-section curve using a roughness meter (for example, Kosaka Laboratory F3500D) made of a Gaussian filter according to JIS B0601-1994. Find the roughness curve and use the arithmetic average value obtained from the roughness curve.

  Since the pressure at which the decorative sheet 21 is pressed against the mold surface is different between the case of the vacuum molding die 9 for resin molded products and the case of the injection molding die 10 for resin molded products, the effect of preventing adhesion is exhibited. The average surface roughness Ra and the numerical range of the dynamic friction coefficient are different.

  For example, when the decorative sheet 21 is used for the vacuum molding die 9 for a resin molded product, the decorative sheet 21 is molded with a clamping material 3 with a force of several N to several hundred N (several kilograms to several tens kilograms). Therefore, the decorative sheet 21 is hardly attached to the mold surface from the beginning. Therefore, the average surface roughness Ra is shifted to the higher upper limit.

  On the other hand, when the decorative sheet 21 is used for the injection mold 10 for resin molded products or the press mold 8, the decorative sheet 21 is several hundred tons due to the clamping force of the male mold 4 and the female mold 5. Since it is inserted into the mold by force, the decorative sheet 21 is likely to adhere to the mold surface. Therefore, the average surface roughness Ra is shifted toward a lower upper limit.

(About the decorative sheet) For the decorative sheet, the relationship with the mold surface having the average surface roughness Ra in the numerical range is correlated with the dynamic friction coefficient between the two, and the numerical value of the dynamic friction coefficient that exerts an adhesion preventing effect. The range was selected.

  In the present invention, the “dynamic friction coefficient” means, as shown in FIG. 8, a decorative sheet 21 is pasted on one side of a plastic plate 12 having a 1 cm square and a thickness of 1 mm via a double-sided tape 13 to obtain an average surface roughness. Place on Ra mold surface. The ink layer 14 (decorative layer 2) side of the colored sheet is brought into contact with the mold surface. A conductive wire 15 is attached to the opposite surface of the plastic plate 12, a weight 16 having a weight of 0.98 N is placed thereon, and the plastic plate 12 to which the decorative sheet 21 is attached via the conductive wire 15 is attached to the average surface. Pulling is performed at a speed of 5 cm / s on the mold surface having the roughness Ra, and the load at that time is measured. The load measurement is performed by calculating the load data when moving the tension driver 24 by connecting the lead wire 15 through the pulley 17 to the tension chuck 19 of the tensile tester 18 and recording it on the graph. Take the average value of load when moving 5 cm. A value obtained by dividing the average load value (N) by the weight 0.98N of the weight 16 is defined as a dynamic friction coefficient (the weight of the plastic plate 12, the conductive wire 15, and the double-sided tape 13 is set to be less than 0.005N. ). In the above description, the reason why the size of the plastic plate 12 is 1 cm square is that the pattern of the mold surface having the average surface roughness Ra can be evaluated even in a small area. The reason why the weight 16 is set to 0.98 N is to make it as heavy as possible within the range that can be placed on the test piece having a small area in order to remove the error of the apparatus. The measurement error includes an error in the weight of the plastic plate 12 or the like. This definition is the relationship between the decorative layer 2 of the decorative sheet 21 and the mold surface of the average surface roughness Ra, and the relationship between the base sheet 1 of the decorative sheet 21 and the mold surface of the average surface roughness Ra. The same applies to. Based on the above measured values, the value is calculated by the recording personal computer 20 to calculate the value of the dynamic friction coefficient.

  In the present invention, the degree of the dynamic friction coefficient is considered to depend on both physical roughness and chemical adhesion of the mold surface.

  The value of the dynamic friction coefficient required for the decorative sheet 21 varies depending on the type of molding die in which the decorative sheet 21 is used. This is because there is a great difference in the pressing force of the decorative sheet 21 on the mold surface depending on the type of molding die.

  That is, when the decorative sheet 21 is used for the vacuum molding die 9 for a resin molded product, the decorative sheet 21 is molded by the clamp material 3 with a force of several N to several hundred N (several kilograms to several tens kilograms). Since the decorative sheet 21 is not likely to adhere to the mold surface, the dynamic friction coefficient may be relatively large.

  When the decorative sheet 21 is used for the injection mold 10 for a resin molded product or the press mold 8, the decorative sheet 21 has a force of several hundred tons by the clamping force of the male mold 4 and the female mold 5. Since the decorative sheet 21 is easily attached to the mold surface because it is sandwiched between the molds, the dynamic friction coefficient needs to be relatively small.

Table 3 shows the mold surface and decorative sheet having an average surface roughness Ra of 30 (× 10 ⁻³ mm) when a plurality of types of decorative sheets 21 are used in the vacuum forming mold 9 for resin molded products. It is the table | surface which showed the range where the dynamic friction coefficient between 21 base-material sheets 1 is measured, and the adhesion prevention effect is exhibited (refer Table 3). The measuring method was based on the method shown in FIG.

Table 4 shows the mold surface and the decorative sheet 21 having an average surface roughness Ra of 12.5 (× 10 ⁻³ mm) when a plurality of types of decorative sheets 21 are used in an injection mold. It is the table | surface which showed the range where the dynamic friction coefficient between the base sheet | seats 1 was measured, and the adhesion prevention effect was exhibited (refer Table 4). The measuring method was based on the method shown in FIG.

  In addition, the decorative sheet 21 according to the present invention can be applied to various uses. The product forms include a three-dimensional molding sheet, a transfer foil, a decorative sheet, and the like. The three-dimensional molding sheet is to sell the decorative sheet 21 molded into a three-dimensional shape as a finished product, or the decorative sheet 21 molded into a three-dimensional shape is fitted into an injection mold. After that, it is used by being integrally bonded to an injection molded product. The transfer foil is used by transferring a transfer layer to a transfer object and peeling off the substrate sheet 1. The decorative sheet is a flat decorative sheet 21 that is fed between a male mold 4 and a female mold 5 of an injection mold for resin molding, is placed along the concave portion 6 of the female mold 5, and is sandwiched between The decorative sheet 21 is molded into a three-dimensional shape by injecting a molten resin and solidifying it, and is used by being integrally bonded to a molded product.

  As long as the decorative sheet 21 has at least the decorative layer 2 formed on the base sheet 1, the transfer foil (the base sheet 1 is peeled off) and the insert sheet (the base sheet 1 is not peeled off). Any of these may be used. A simple decorative sheet refers to a sheet in which at least the decorative layer 2 is formed on the base sheet 1 and does not have an adhesive layer.

  As a material of the base sheet 1, a base sheet 1 of a normal decorative sheet 21 such as a resin sheet such as a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, an acrylic resin, or a polyvinyl chloride resin is used. What is used can be used.

  The decorative layer 2 is usually formed on the base sheet 1 as a printing layer. As a material for the printing layer, a binder such as a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin is used as a binder. And a color ink containing an appropriate color pigment or dye as a colorant may be used. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used. The print layer may be formed entirely or partially depending on the pattern to be expressed.

  The decorative layer 2 may be composed of a metal thin film layer or a combination of a printed layer and a metal thin film layer. The metal thin film layer is for expressing the metallic luster as the decorative layer 2 and may be formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like. A metal such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, or zinc, or an alloy or compound thereof may be used depending on the color of the metallic luster to be expressed. The metal thin film layer may be partially formed. Further, an anchor layer may be formed in order to improve the adhesion with other layers when forming the metal thin film layer.

  Moreover, you may form an contact bonding layer as needed. The adhesive layer adheres the decorative sheet 21 onto a molded resin or the like. As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for a material such as a molding resin is appropriately used. For example, when the material of the molding resin is an acrylic resin, an acrylic resin may be used. If the material is polyphenylene oxide resin, polystyrene resin, polycarbonate resin, styrene copolymer resin, or polystyrene blend resin, acrylic resin, polystyrene resin, polyamide resin that has an affinity for these resins It is good to use. Further, when the material is a polypropylene resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, a coumarone indene resin, or the like may be used. Examples of the method for forming the adhesive layer 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. Alternatively, an adhesive sheet made of the above material can be bonded by a laminating method or the like to form an adhesive layer.

  Moreover, you may form an overcoat layer as needed. The overcoat layer is a layer for protecting the decorative layer 2. As the overcoat layer, a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like may be used.

The configuration of the decorative sheet 21 is not limited to the above-described embodiment. For example, when a material having excellent adhesiveness with a molding resin is used as the material of the decorative layer 2, the adhesive layer is omitted. Can do. Moreover, when the decoration layer 2 needs to be concealed, a concealment layer may be formed. The concealing layer is preferably composed of a layer containing a pigment such as titanium oxide or a metal vapor deposition layer having a thickness of 0.01 × 10 ⁻³ mm or more.

(About the manufacturing method of the molded decorative sheet) The manufacturing method of the molded decorative sheet according to the present invention is, for example, a mold surface using the vacuum molding die 9 for resin molded products and the decorative sheet 21 described above. The flat decorative sheet 21 is formed into a three-dimensional shape by pressing with a clamp member 3 (see FIGS. 2 and 5).

  In addition, if it is a shaping | molding method which presses and processes the decorating sheet | seat 21 with the clamp material 3 to a metal mold | die surface, it is possible to apply pressure forming (including ultra-high pressure forming), blow molding, hydroforming, etc., for example.

  Moreover, the manufacturing method of the decorative sheet | seat shape | molded of this invention is using the injection mold 10 for resin molded products demonstrated above, for example, and decorating the decorative sheet 21 between the male mold | type 4 and the female mold | type 5. The flat decorative sheet 21 is formed into a three-dimensional shape while being sandwiched (see FIG. 6).

  For example, compression molding or press molding can be applied as long as the decorative sheet 21 is sandwiched between the male mold 4 and the female mold 5 and molded. It is also possible to use a combination of the vacuum mold 9 for resin molded products and an injection mold for resin molding.

(Manufacturing method of a molded product with a decorative sheet) Using the injection mold 10 for a resin molded product, the decorative sheet is sandwiched between a male mold 4 and a female mold 5 and molten resin is injected into the cavity. Then, by solidifying, the planar decorative sheet 21 is molded into a three-dimensional shape and the decorative sheet 21 and the resin molded product are integrated.

  In order to mold the decorative sheet 21, it is preferable to perform vacuum suction between the female mold 5 and the decorative sheet 21. Examples of the molten resin include general-purpose resins such as polystyrene resin, polyolefin resin, ABS resin, AS resin, and AN resin.

The outer periphery of the concave portion of the female die of a press mold comprising a female die having a U-shaped concave portion as shown in FIGS. 1 and 2 and a male die having a convex portion matching the concave portion of the female die ( The average surface roughness Ra = 55 × 10 ⁻³ mm (55 μm)) was processed by polishing so that the average surface roughness Ra was 1 × 10 ⁻³ mm (1 μm).

  Next, a resin sheet having a thickness of 2 mm was used as a base sheet, and a decorative layer having a wood grain pattern was formed thereon by gravure printing using urethane ink. Furthermore, the decorative sheet for building materials in which the layer which consists of transparent urethane-type resin and isocyanate resin was formed as an overcoat layer on this was created.

  When this decorative sheet for building materials is placed on the press mold and subjected to press molding processing, cohesive fracture pieces remain on the female mold when the decorative sheet is pulled away from the mold surface, or the decorative sheet There was no defect in the case. In the press mold before polishing, some of the cohesive fracture pieces of the overcoat layer were attached to the press mold on the corners of the inner surface of the recess of the female mold and the outer periphery of the recess.

  The decorative sheet thus formed is integrated by bringing the molten resin into contact with the base sheet side, not the overcoat layer side.

  When the dynamic friction coefficient between the mold surface before polishing of the press mold and the mold surface after polishing and the overcoat layer of the decorative sheet for building material was measured, the former was 2 .9, the latter being 0.6.

The average surface roughness of the mold surface is obtained by grinding the outer periphery (Ra = 65 × 10 ⁻³ mm) of the recess of the vacuum molding die for resin molded products having a box-shaped recess as shown in FIGS. It processed so that Ra might be ^10x10 <^-3> mm.

  Next, using a colorless and transparent acrylic resin film as a base sheet, a vinyl-based ink was printed to form a decorative layer, and then a colored soft vinyl chloride resin film was bonded thereon to create a decorative sheet. The colored soft vinyl chloride resin film was formed in order to impart rigidity and prevent the film from cracking.

  When this decorative sheet is placed on the above vacuum molded mold for resin molded products and vacuum molded while being pressed against the mold surface with a clamp material, the decorative sheet is pulled away from the mold surface. The cohesive fracture pieces did not remain in the female mold and the decorative sheet was not damaged. In the vacuum molding die for a resin molded product before cutting, an eluate that seems to be a plasticizer for a colored soft vinyl chloride resin film was adhered.

  Measure the coefficient of dynamic friction between the mold surface before grinding of the vacuum mold for resin molded products and the mold surface after grinding, and the colored softened vinyl chloride resin film of the decorative sheet. As a result, the former was 3.3 and the latter was 1.5.

The entire surface of the recess (Ra = 50 × 10 ⁻³ mm) of the injection mold for resin molded products having the recess shape as shown in FIG. 6 is subjected to electric discharge machining, and the average surface roughness Ra is 0.2 × 10 ⁻³ mm. It was processed to become.

  Next, a polyester resin film is used as a base sheet, an acrylic ink is used to form a picture layer, and a vinyl resin ink is used to form an adhesive layer thereon to create a woodgrain pattern transfer foil. did.

  This transfer foil was placed between the male mold and female mold of the above injection mold for resin molded products, clamped, and injection molded. When the transfer foil was pulled away from the mold surface, cohesive failure occurred. The piece did not remain in the female mold and the decorative sheet was not damaged. In the above injection molding die for resin molded products before electric discharge machining, a part of the pattern layer and the adhesive layer of the transfer foil adhered to the male mold surface after molding.

  When the dynamic friction coefficient between each of the mold surface before the electric discharge machining of the injection mold for resin molded products and the mold surface after the electric discharge machining and the adhesive layer of the transfer foil was measured, the former was 2. 8. The latter was 0.4

  This invention relates to a decorative sheet-forming mold and is industrially useful.

It is a perspective view which shows the metal mold | die for decorating sheet forming of this invention. It is sectional drawing which shows 1 process of the manufacturing method of the decorating sheet shaping | molding die of this invention, and the shape | molded decorating sheet. It is sectional drawing which shows 1 process of the manufacturing method of the conventional metal mold | die for decorating sheet shaping | molding and the shape | molded decoration sheet | seat. It is a perspective view which shows the metal mold | die for decorating sheet forming of this invention. It is sectional drawing which shows 1 process of the manufacturing method of the decorating sheet shaping | molding die of this invention, and the shape | molded decorating sheet. It is sectional drawing which shows 1 process of the manufacturing method of the conventional metal mold | die for decorating sheet shaping | molding and the shape | molded decoration sheet | seat. It is a perspective view which shows the metal mold | die for decorating sheet forming of this invention. It is a schematic diagram which shows the state which is measuring the dynamic friction coefficient of a decorating sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base sheet 2 Decorating layer 3 Clamping material 4 Male mold 5 Female mold 6 Concave part 7 Convex part 8 Press molding die 9 Vacuum molding die for resin molded products 10 Injection molding die for resin molded products 11 Resin injection port 12 Plastic plate 13 Double-sided tape 14 Ink layer 15 Conductor 16 Weight 17 Pulley 18 Tension tester 19 Tension chuck 20 Recording personal computer 21 Decorating sheet 22 Vacuum suction hole 23 Guard 24 Tension drive

Claims (4)

The position accuracy of the decorative layer formed on the decorative sheet and the mold shape is maintained in a state in which the decorative sheet having at least the decorative layer formed on the base sheet is pressed and fixed to the mold surface with a clamp material. A mold for decorating the sheet for molding, and the average surface roughness Ra of the clamp surface in contact with the decorating sheet or the mold surface corresponding thereto is 0.01 to 30.0 × 10 ^A mold for molding a decorative sheet, which is ^-3 mm. 2. The decorative sheet molding die according to claim 1, wherein the decorative sheet molding die is a vacuum molding die for resin molded products. The position of the decorative layer and the mold shape formed on the decorative sheet in a state in which the decorative sheet having at least the decorative layer formed on the base sheet is sandwiched between the male mold and the female mold and fixed. Decorative sheet molding mold for molding with accuracy, and the average surface roughness of at least one of the male or female mold surface that comes into contact with the decorative sheet when the decorative sheet is sandwiched A decorative sheet-molding mold having a thickness Ra of 0.01 to 12.5 × 10 ⁻³ mm. 4. The decorative sheet molding die according to claim 3, wherein the decorative sheet molding die is an injection molding die for a resin molded product.

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