JPS60147335A - Manufacture of paperboard hot-pressed molded shape - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in a method for manufacturing a paperboard thermoformed product.

2. Description of the Related Art Paperboard hot-press molded products are used as interior materials for automobiles by press-forming paper boards impregnated with a binder under heat, shaping them into a certain shape, and solidifying the binder. In order to enhance the design effect of this paperboard hot-press molded product, the surface of the molded product is subjected to treatments such as painting or graining.

[Prior art 1] A conventional method for manufacturing a paperboard thermoformed product with an aesthetically treated surface is to apply a coating to the surface of a paperboard containing a thermosetting binder, and then apply a coating to the coated surface using a cibo roll. After being processed, it was cut, molded into a certain shape using a pot press, and then heated and hardened. This manufacturing method prevents impurities (
In order to prevent the thermoplastic resin contained in the waste paper from staining the coating surface, it is necessary to refine the waste paper to a very high level, and the types of waste paper that can be used are also limited. It has the disadvantage of high cost.

[Object of the Invention] An object of the present invention is to provide a method for producing a paperboard hot-press molded product that requires few manufacturing steps, has excellent workability, is made of inexpensive materials, and has high surface decorative properties.

[Summary of the Invention] The method for producing a hot-press paperboard product of the present invention involves laminating decorative paper on one side of paperboard containing a binder with an adhesive interposed therein, and a nonwoven fabric on the other side with an adhesive interposed therebetween. Step: The laminate is placed on a pressure platen so that the decorative paper is in contact with the surface plate surface having the grain pattern, and the laminate is heated under pressure with the pressure platen to form an integrated molding with the grain pattern. The method is characterized by the following steps: obtaining a raw material; placing the obtained molding material in a molding die; pressurizing and heating it to shape it into a nail shape; and curing the binder.

In the manufacturing method of the present invention, the decorative paper and the nonwoven fabric are bonded to the paperboard in one step, and the surface of the decorative paper is also textured at the same time. For this reason, there is no need to use textured decorative paper, and the cost is accordingly reduced. Further, since the nonwoven fabric and the decorative paper are bonded to the paperboard at the same time, fewer steps are required. Furthermore, since a nonwoven fabric is laminated on one side of the paperboard, the impact resistance, which is a drawback of paper with many impurities, is improved.

[Detailed Description of the Structure of the Invention] Step 11 of the method for producing a thermoformed paperboard product of the present invention involves interposing an adhesive on one side of the paperboard containing a binder, and applying the adhesive to the other side of the paperboard containing a bonding agent. It is a process to obtain a laminate by laminating nonwoven fabrics with a
It contains about 0 to 30% of a thermosetting binder. Note that the paperboard is not limited to cellulose fibers, and may include natural fibers such as cotton, synthetic fibers such as heat-resistant high-0 polyester l1iN, and mineral cords such as glass fibers. As the thermosetting binder, phenol resin, unsaturated polyester resin, melamine resin, etc. are used. T. Decorative paper is a sheet-like paper whose surface has been aesthetically treated such as painting or printing. Paper made of paper is mainly used, but decorative paper made of plastic may also be used in special cases.

A nonwoven fabric is an aggregate of fibers that are longer than cellulose fibers, and refers to an aggregate of natural fibers, synthetic W41IIi, and the like. Here, a material having a temperature of about 30 to 100 degrees per 11R2 is used.

The first step is to form a laminate by placing decorative paper on one side of the paperboard and nonwoven fabric on the other side with an adhesive interposed therebetween.

As the adhesive used between the nonwoven fabric and the paperboard, hot melt type adhesives, specifically, polyethylene powder, ethylene vinyl acetate copolymer powder, etc., and water-soluble adhesives can be used. The adhesive between the decorative paper and the paperboard may be a hot-melt adhesive, but preferably a water-soluble adhesive with a certain degree of spreadability.

The 21st step of the present invention is to place the laminate on a pressing surface plate so that the decorative paper is in contact with the surface of the surface plate having the grain pattern,
This is a process in which the surface of the decorative paper is pressurized or heated under pressure to form a textured pattern on the surface of the decorative paper, and the decorative paper and nonwoven fabric are bonded to a paperboard to obtain a molded material with a textured pattern. In this step, first, the paperboard, decorative paper, and nonwoven fabric are bonded together by compressive force, and the surface of the decorative paper is textured.

As the pressing surface plate, it is preferable to use a pair of upper and lower flat press molds.

The third step is a molding step in which the obtained molding material is placed on a mold, heated and pressurized to form a nail into a certain shape, and at the same time hardens the binder contained in the paperboard. This mold has a mold surface corresponding to the shape of the paperboard hot-press molded product, and the molding material is press-molded between the molds, and the molding material is shaped into a shape according to the mold surface, and The thermosetting binder contained in the molding material, especially the paperboard constituting the molding material, is heated and hardened by the heat of the molding die, thereby fixing it in the nail-shaped shape.

In addition, it is possible to provide a cutting step in which the molding material is cut into a shape that conforms to the molded product before forming the culm.

[Effects of the Invention] In the method for producing a hot-press paperboard molded product of the present invention, there is no need to use textured decorative paper, resulting in low cost.

In addition, the number of processing steps is small because adhesion of the decorative paper and nonwoven fabric to the paperboard and texturing of the decorative paper can be accomplished in one step. Furthermore, the texture is not applied to the decorative paper, but also to the surface of the paperboard that comes into contact with the decorative paper. For this reason, the grain is less likely to become thinner during the molding process, and a paperboard hot-press molded product with highly designed grain can be produced.

Furthermore, since one surface of the paperboard is reinforced with a nonwoven fabric, the mechanical strength such as impact resistance of the resulting paperboard thermoformed product is improved.

[Example] First, a board N containing 10% by weight of a curable melamine binder was used as a paperboard (thickness 0.8++++++, 640 (1/m
2) was used. The decorative paper used was paper whose surface was coated with acrylic paint. The non-woven fabric is made of polyester fibers and is 1 meter long. Per 409 later was used. Sprinkle adhesive made of polyethylene powder on one side of this paperboard.

The nonwoven fabrics were laminated, ethylene vinyl acetate adhesive was further applied to the back side of the decorative paper, and the paperboard was laminated to obtain a laminate.

Next, the above-mentioned 1F6 body was placed in a flat press mold having a grain pattern on the mold surface of the lower mold, the mold temperature was set to 100°C, and 2k
The paperboard was heated under pressure F'C'' for 1 minute to adhere the decorative paper and non-woven fabric to the surface of the paperboard, and at the same time, the surface of the decorative paper was textured. 1tJi L
-ta.

Next, a pair of molds consisting of an upper mold and a mold 1 are heated to 180°C, and the cut molded rope material 3 is placed between the molds.
f, 1 kn/ant 2ft, type RF machined, heated for 2 minutes, heated aE. The thermosetting binder contained in the paperboard was heated and cured by this pressure and heating, and a paperboard hot-press molded product (not shown in the figure) was fabricated.

[Brief explanation of the drawing]

The figure is a perspective view of a paperboard thermo-press molded product made by the manufacturing method of this example. Patent applicant Toyota Kako Co., Ltd. and agent Patent attorney Hiroma Okawa Patent attorney Shudo Fujitani Patent attorney Akio Maruyama

Claims (1)

[Claims] (1) A step of laminating a decorative paper with an adhesive on one side of paperboard containing a binder and a nonwoven fabric with an adhesive on the other side to obtain a laminate; A step of placing the laminate on a pressure surface plate so as to contact the decorative paper and pressurizing it with the pressure surface plate to obtain an integrated molded material with a grained pattern. Molding the 1q molded material. Reduce it to a mold, place it, heat it under pressure,
A method for producing a hot-press paperboard product characterized by forming into a certain shape and curing a binder; and J: bending.