JP2597824B2 - Shaped sheet for thermosetting decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaped sheet for a thermosetting decorative board for forming an uneven pattern on the surface of the thermosetting decorative board during production.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a thermosetting decorative board, a shaping sheet for forming an uneven pattern on the surface thereof has been used.
A heat-resistant film such as PET (polyethylene terephthalate) or a film such as polyvinyl chloride, polypropylene, polyethylene, or vinylon is used when no heat is applied. In addition, Jiko 61-28000
No. 1 discloses a shaped film obtained by extrusion-coating and laminating a paper such as a high-quality paper or a kraft paper with a polyolefin resin such as a polypropylene or a polymethylpentene resin.

[0003]

SUMMARY OF THE INVENTION However, PET
When a heat-resistant film such as that described above is used as a shaped sheet, there is an advantage that the sheet does not deform even when hot pressure is applied, but there is a drawback that fine embossing cannot be performed because the hardness is too high. Was. Further, when polyvinyl chloride, polypropylene, polyethylene, vinylon, or the like is used, embossing is easy, but there is a drawback that the sheet is stretched and deformed by applying heat and pressure. Further, there is a disadvantage that the film is easily cut due to low strength. In addition, these films are suitable or unsuitable for mold releasability depending on the type of resin constituting the decorative board to be processed, and their use range is limited. In addition, when a plastic film substrate is used, general disadvantages include difficulty in releasing after molding by charging, suction of dust, and curling due to lamination with polyolefin.

In the case of a conventional laminated imprinted film of paper and polyolefin, curling, antistatic properties and releasability are good, but when used for a thermosetting decorative board, the formation of paper and traces of fibers due to heat and pressure can be observed on the decorative board. There was a defect that the unevenness on the surface was not faithfully and clearly reproduced on the surface. The present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a shaped sheet that can be finely embossed, is not easily deformed by heat and pressure, and has a wide application range. Is to do.

[0005]

Means for Solving the Problems As a result of repeated studies to achieve the above object, the present inventor has found that a base sheet that is less likely to be deformed by heat or various tensions and a heat sheet that can be finely embossed. By forming a shaped sheet by laminating a plastic film, it has been found that a shaped sheet for a thermosetting decorative board having a wide range of application and utilizing the advantages of both can be obtained.

That is, the shaped sheet for a thermosetting decorative board of the present invention comprises glassine paper, parchment paper,
Using any of sulfuric acid paper, coated paper and art paper, a laminated sheet is formed by laminating a stretched polypropylene sheet as a thermoplastic polyolefin resin layer on the base sheet, and an embossed pattern is formed on the polyolefin resin layer. Is provided.

The base sheet used in the present invention includes:
The thickness is preferably from 3 to 250 μm, more preferably from 12 to 100 μm. In the present invention, glassine paper, parchment paper, parchment paper,
Either coated paper or art paper is used in order to control deformation of a stretched polypropylene sheet, which is a polyolefin resin layer, due to heat and pressure when used for a thermosetting decorative board.

[0008] The thickness of the stretched polypropylene sheet to be laminated on the substrate sheet is set according to the depth of the emboss to be processed. In addition, a paint (including silicone, wax, fluorine-based resin, etc.) having releasability on the surface of this resin layer with respect to a thermosetting decorative board or the like to be processed.
May be applied. Furthermore, as a method of laminating the above-mentioned base sheet and a stretched polypropylene sheet as a polyolefin resin layer as shown in FIG. 1, commonly used dry lamination, wet lamination, hot-press embossing and hot-melt simultaneously are performed. A so-called doubling emboss to be worn can be used.

The embossing method applied to the polyolefin resin side of the shaped sheet formed by laminating includes:
A known embossing method can be used. For example, a hot press embossing method using a flat plate or a roll plate can be used. Further, as the emboss shape to be formed, a precise emboss pattern as shown in FIG. 2 is desirable. That is, it is an aggregate of a pattern consisting of a group of irregularities or grooves forming parallel straight lines or curves and a closed boundary line surrounding the group, and the parallel lines or straight lines of adjacent patterns sharing the boundary line. The directions of the groups are different, the depths and intervals of the lines are 0.1 to 100 μm, and the difference in direction between the adjacent groups via the boundary line is 5 ° or more. This type of pattern has a characteristic feature in that the gloss of each closed region changes depending on parallax. In order to make the directions of adjacent line groups all different, it is necessary and sufficient that there are four or more types of direction differences from the "theorem of four-color problem" of topology.

The thermosetting decorative plate according to the present invention may be a melamine, diallyl phthalate, phenol, guanamine, urea resin, polyester, or the like, the surface of which is printed, if necessary, on titanium paper mixed with a titanium oxide pigment. One or more sheets impregnated with the above resin and, if necessary, a transparent paper on the printing side and an overlay paper impregnated with the above resin, and a core paper on the opposite side to the printing side are laminated, and hot-pressed. It is made by curing the above resin.

At this time, the shaped sheet of the present invention is laminated between the printing paper or the overlay paper and a hot plate or a mirror plate, and after molding, the shaped sheet is released.

[0012]

According to the present invention, by using a base sheet that is less likely to be deformed by heat and various tensions, such as glassine paper, parchment paper, parchment paper, coated paper, and art paper, as a base sheet. Prevents deformation of the shaped film during press forming of thermosetting decorative boards, and also uses a stretched polypropylene sheet that can be finely embossed and has a high heat deformation temperature on the embossed surface side to achieve thermosetting properties. At the time of press molding for decorative boards, embossing excellent in design can be performed.

In particular, when a paper having a fine texture such as glassine paper and a flat surface with good smoothness is used as the base sheet, there is no difficulty in releasing the shaped sheet due to curl charging, suction of dust and the like, and Excellent embossing can be performed for thermosetting decorative boards, such that a faithful embossed pattern can be reproduced without formation of heat-pressed formation or fiber traces on the decorative board.

[0014]

[Example 1]

Parchment paper (Daio Paper) to OPP (Nimura Chemical F
OR 20μ), and heat is applied to the OPP (stretched polypropylene) side (150 ° C), and the precision emboss pattern shown in FIG.
m, depth 10 μm, parallel line angle 0 ° (reference), 3
(4 types of 0 °, 60 °, 90 °) Emboss is formed.

Next, a balance sheet, modified phenolic core paper (made by Ota Sangyo), melamine resin impregnated titanium paper, melamine resin impregnated overlay (OL-25 made by Ota Sangyo), and the above shaped sheet (so that the embossed surface contacts the overlay)
Are sequentially laminated, and hot-pressed (80 kg / cm ² , 135
(15 ° C., 15 minutes), the sheet itself did not curl and no static electricity was generated, so that a clean molded product could be obtained because of good workability at the time of release and no suction of dust. In addition, there is no unevenness of paper formation and fiber traces transferred to the molded product due to the hot pressure of press molding, and there is no elongation or distortion of the embossed uneven pattern due to the hot pressure during press molding due to the backing of the paper. The unevenness of the shaped sheet was able to be shaped into a high-pressure melamine decorative board.

Example 2 SK coated paper (Sanyo Kokusaku pulp (manufactured by) 104.7 g / m)
² ) Dry-laminated OPP (FOR 20μ, manufactured by Nimura Chemical Co.), and embossed on the OPP side as in Example 1. Next, a balance sheet, modified phenolic core paper (Ota Sangyo), melamine resin-impregnated titanium paper, melamine resin-impregnated overlay (OL-25, Ota Sangyo), and the above shaped sheet (so that the embossed surface is in contact with the overlay) are sequentially laminated. And
Hot press (80 kg / cm ² , 135 ° C, 15 minutes), the sheet itself does not curl and does not generate static electricity. Was completed. In addition, there is no paper formation unevenness and fiber traces transferred to the molded product due to the hot pressure of press molding. The unevenness of the shaped sheet was able to be shaped into a high-pressure melamine decorative board.

[0017]

As described above, according to the present invention, it is possible to provide a shaped sheet for thermosetting decorative boards which is resistant to heat and tension and can be subjected to fine embossing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a shaped sheet of the present invention.

FIG. 2 is a plan view showing an example of a precision emboss pattern formed on a shaped sheet of the present invention.

Claims (2)

(57) [Claims] 1. Glassine paper, parchment paper, parchment paper,
Either coated paper or art paper is used as a base sheet, and a stretched polypropylene sheet is laminated on the base sheet as a thermoplastic polyolefin-based resin layer.
Thermosetting , wherein a laminated sheet is formed and an embossed pattern is provided on the polyolefin resin layer .
Shaped sheet for decorative board . 2. The base sheet has a thickness of 3 to 250 μm.
m, shaped sheet according to claim 1, wherein more preferably at 12～100Myuemu.