JPS606455A - Paperboard hot-pressed shape with skin and manufacture thereof - 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 The present invention relates to a method for manufacturing paperboard hot-press molded articles (13 and -).

Many paperboard thermoformed products are used as interior materials for automatic AI and components for home appliances. Conventional paperboard hot-press molded products are produced by pressing coated fi'i layer paperboard.

The object of the present invention is to provide a hot-press molded paperboard product having a new type of skin in which a heat ii) plastic resin film is integrally molded and bonded as the skin, and a method for manufacturing the same.

The paperboard hot-press molded product having a skin according to the present invention includes a body made of a paperboard hot-press molded body having a certain shape, and a thermoplastic resin molded product integrally formed on the surface of the body. It is characterized by consisting of a film epidermis.

The main body of the hot-press paperboard assembly of the present invention is essentially the same as the conventional hot-press board assembly, except that it contains about 20% of a thermosetting binder. This paperboard is impregnated with about 20% thermosetting binder and then compressed while heating to form a certain shape.The thermosetting binder is cured and the paperboard retains its shape. It is a waste of time to improve one's sexuality. This body has a constant shape along the mold surface. The shape and J7 shade can be arbitrarily selected depending on the purpose.

The material of the main body is generally 19 paper, but it may also be natural uA fibers such as cotton, highly heat-resistant polyester fibers, or mineral fibers such as glass fibers. As the binder, thermosetting 4Mi resins such as phenolic resins, unsaturated polyester resins, and melamine resins are used.

The other (M-formed C(J/I) skin of the molded article of the present invention is
414 made of thermoplastic resin film. This epidermis has an uneven pattern or a certain pattern on its surface.
7 (= It is preferable that the surface has a certain degree of decorative properties.As for the thermoplastic resin film that forms the skin (111), polyvinyl chloride resin, which is relatively easy to shrink, is used. Soft J3 and semi-rigid 4rr4 resins such as ethylene fit rlllll vinyl F resins are preferred.Crystalline thermoplastic resins such as J3, polyethylene and polyethylene are also preferred.
A: It can be used in some cases. However, when the Ii'i crystalline thermoplastic resin film is used as the skin film, relatively large strains tend to remain in the molded skin.

Therefore, except in special cases, it is preferable to use an amorphous Atsuta plastic resin.

The paperboard thermoformed product of the present invention is made of soil 1. [The outer skin and the wooden rest are integrally molded. Note that the integrity of the skin and the main body may be maintained by interposing a suitable adhesive between the skin and the main body. In special cases, the back side of the epidermis may be partially dissolved. %
ilzaV, Ji'j may be shielded on the surface of the main body. As the adhesive, a highly heat-resistant thermoplastic resin is preferred.

The paperboard hot-press molded product having a skin according to the present invention has a skin made of a thermoplastic resin film, and differs from conventional paperboard hot-press molded products in that the skin is integrally molded. In conventional plate-assembled hot-press molded products, the entire product is molded using a single press. Melt, 1! It does not make an excellent decorative skin. Further, when a skin is to be bonded to the surface of a paperboard thermoformed product afterwards, it is difficult to adhere the skin completely and integrally. 'If the surface of Cr is two-dimensionally curved, it is very difficult to adhere the skin to the main body surface.
1, and the cost is high.

Next, a method for producing a paperboard thermoformed product having a skin according to the present invention d
Let me explain 1.

The manufacturing method of the present invention is a method of manufacturing a paperboard thermoformed product by pressure-forming and heating a sheet-like raw stone between at least a pair of materials, wherein the sheet-like raw material is a paperboard containing a thermosetting binder. It consists of a thermoplastic resin V'J film laminated on one side of the paperboard, one of the pair of molds is maintained while the thermosetting binder is fully cured, and the other mold is laminated with the thermoplastic resin frame.
The paperboard of the sheet-like raw material is placed on one side of one of the pair of molds while the paperboard is kept at a temperature lower than the softening point of the thermoplastic resin film. 11
It is characterized in that it is placed on one side of the other mold of No. 1, and compresses the sea 1 to +11231 between the −phantom molds.

The pair of molds used in the manufacturing method of the present invention are identical in shape and formation to the pair of molds used in the manufacturing method of this paperboard thermoforming product. You can use it. However, the production of the present invention:/
J'rh has 13 - phantom gold! 1'1 Ichinoj
Jvj is heated to the temperature required to cure the thermosetting binder contained in the raw paperboard. However, in the method of the invention, the other mold is maintained at a low temperature. The other mold is maintained at a temperature lower than the softening point J of the thermoplastic resin film used as the raw material. It cools the material and prevents it from melting. Molding and compression of the raw material is performed between the pair of molds. Conventionally, when C-molding was performed with significantly different humidity between one mold and the other, the deformation was ugly, but The thermosetting binder impregnated into the paperboard hardens and prevents deformation.

The sheet-like raw material used in the manufacturing method of the present invention is composed of a paperboard containing a thermosetting binder that forms the main body and a thermoplastic resin film that forms the skin. An adhesive can be interposed between the paperboard and the thermoplastic resin film. As the paperboard, laminated paperboard containing a thermosetting binder used in the production of conventional paperboard thermoforming products can be used as is. As the thermoplastic resin film, a 0°2 mm+-0.25 mm thick vinyl resin film, an ethylene vinyl acetate copolymer resin film, etc. can be used.

When compression molding the sheets 1 to 131 between the pair of molds, the paperboard side of the sheets 1 to 131 is placed on the heated mold side, and a thermoplastic resin film is placed in the mold with low temperature decay. Distribute it to the side. The molding pressure and molding time are set to a value such that the sheet antigen tel is sufficiently deformed between the pair of molds and the thermosetting adhesive is hardened. In addition, heat the thermosetting resin to a certain temperature! The ζ-type heat completely melts the thermoplastic resin film that forms the skin.
It should not be a Jrum. In such a case, other methods 1'! It is preferable to further lower the temperature of the thermoplastic resin film so that the upper surface of the thermoplastic resin film is not exposed to heat.

In the manufacturing method of the present invention, a thermoplastic resin film is used as the skin and is integrally formed on the surface of the paperboard molding! ,: The manufacturing of paperboard heat-press molded products with the skin on the right side is now 11 times in progress.

The following is an explanation based on examples.

EXAMPLE FIG. 1 shows a hot-press molded paperboard with a thin surface layer according to this example. This paperboard hot-press molded product is composed of a book (A1) made by hot-pressing paperboard and a skin 2 made of polyvinyl chloride (L\\\) integrally molded and bonded to its surface. J3, an uneven grained pattern is formed on the upper surface of the skin 2.This paperboard thermoformed product is produced between a pair of molds 3 and 4, as shown in the schematic diagram of its production in Figure 2. Sea 1~
It is formed by compressing and molding with a shaped material 5 interposed. The sheet-like blank 5 was made of a laminated paperboard 51 containing about 20% by weight of melamine resin as a binder, and a polyvinyl chloride film 52 having a thickness of 200 μm and having a ripple pattern formed on its upper surface. The pair of molds is an upper mold 3 and a lower mold 4, and the surface temperature of the upper mold 3 is maintained at 50℃.On the other hand, the surface temperature of the regular mold 4 is 150℃.
It is exposed to high temperatures of ℃. In this state, transfer to the sheet 1 in state 4A b (Place the V-layer paperboard 51 facing down on the surface of the lower mold 4, close the molds of mold 3 and lower mold 4,
A load of 14 L was applied and pressure was applied for 2 minutes. After that, the molding die was opened and the obtained product was removed from the lower mold 4 to obtain the paperboard hot-press molded product of this example.

In the above method, the KaFt plate was molded using a t'JC51kt mold 3.4 according to the shape of the mold, and the binder was completely removed, resulting in a hard normal paperboard hot-press molded product. . On the other hand, the upper surface of the outer skin had some burrs remaining, and a portion of the outer skin had been stretched out and was not integrally joined to the upper surface of the main body. As described above, by the production method of the present invention, it was possible to produce a paperboard hot-press molded product having a thermoplastic resin film on the skin. In addition, if the pressure formed on the surface of the thermoplastic resin film is applied between the molding molds, the pressure will not disappear.
■It was the perfect example of its decorative qualities.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the paperboard hot-press molded product of this embodiment, and FIG. 2 is a small explanatory diagram of the manufacturing method of the first embodiment. 1...Water A book 2...Skin 3...Upper mold 4...Lower mold 5...Sheet 1-shaped S...Material

Claims (4)

[Claims] (1) It is characterized by consisting of a main body made of a paperboard thermoformed body having a certain shape, and a skin made of a thermoplastic resin film integrally molded on the surface of the main body. A paperboard hot-press molded product with a J-shaped skin. (2) The paperboard hot-press molded product according to claim 1, wherein the thermoplastic resin is a polyvinyl chloride resin. (3) In a method of manufacturing a paperboard thermoformed product by pressure forming and heating a sheet material between at least one pair of molds, the sheet material is formed into a paperboard containing a thermosetting binder and one side of the paperboard. Laminated! ζ a thermoplastic resin film, one of the pair of molds is maintained at the curing temperature of the thermosetting binder, and the other is maintained at a humidity lower than the softening point of the thermoplastic resin film, The paperboard of the sheet-like raw material is placed on the mold side of one of the pair of molds, the thermoplastic resin film is placed on the mold side of the other of the pair of molds, and the 1. A method for producing a hot-press paperboard product having a skin, which comprises compressing a sheet material between a pair of dies. (4) The manufacturing method according to claim 3, wherein the thermoplastic resin is a vinyl chloride resin.