JPS58107337A - Endless melamine resin group decorative sheet and its manufacture - 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 an endless melamine resin decorative sheet and a method for producing the same.

Conventionally, melamine resin-based decorative materials and laminated materials have been mainly molded by flat plate presses, but only fixed-sized products can be molded.

Continuous molding methods were considered due to problems such as low production efficiency, but there was no suitable molding method, and no laminated materials or laminated structure had been devised, so molding of endless melamine resin decorative sheets was not carried out. There wasn't.

The present invention solves the above-mentioned problems and relates to an endless melamine resin decorative sheet and a method for manufacturing the same, and provides an endless melamine resin decorative sheet and a method for manufacturing the same, which have not existed in the past due to difficulty in molding. It is something.

The present invention will be described in detail according to the drawings of the embodiment. FIG. 1 is a schematic diagram of a molding device, in which a frame (9)
A drive roll (2) is rotatably attached to the frame (9) via a pairing (8), and a tension roll (1) is connected to a bearing (8) and a hydraulic cylinder (10). Attach via. Tension roll (
1) is connected to a drive roll (2) via a stainless steel belt (3).
) is transmitted, and the stainless steel belt (3)
is moderately tensioned by a hydraulic cylinder (10).

A stainless steel belt (3) runs parallel between the drive roll (2) and the tension roll (1), and a slit (15) through which the stainless steel belt (3) can go in and out, and compressed air are provided in the middle. There is a pressurized chamber (4) equipped with an inlet (6') and an automatic solenoid valve (6).

An electric heating plate (5) for heating the back surface of the stainless steel belt (3) is attached inside the pressurizing chamber (6). slit(
15) On the inside, a roll material (16) made of car pump block material is used to eliminate air pressure, and a spring (19)
), and the tip of the roll material (16) is pressed against the back surface of the stainless steel belt (3). Compressed air supplied by a high-pressure empressor (7) is introduced through the inlet (6') and can be maintained at a constant pressure by a child electrode valve (6).

Next, we will describe an example in which an endless melamine resin decorative sheet is molded using a lower molding device.The melamine resin with a low bonding degree is 80 g/m2 of a cellulose printing paper and the weight ratio of the printed paper difference material is 80g/m2. Impregnated paper for the surface layer (16) impregnated with 140%, parchment paper (10) with a basis weight of 100 g/m2, and cellulose paper (a) with a weight of 80 g/m2, containing 100% melamine resin by weight ratio to printing paper difference material. The treated back side impregnated paper (12') is simultaneously and continuously inserted between the stainless steel belts (3), and air is applied at 10 kg/cm2 and heated to 180°C to form an endless melamine resin decorative sheet (14). Molded.

As a heating means, in addition to using the electric heating plate (5) as in the above embodiment, the molding temperature can be increased to 100 to 100°C by circulating a heating medium (steam oil), far-infrared lamp, infrared lamp, induction heating (microwave, high frequency), etc. A heating method that can achieve a temperature of 180°C can be used. Also, stainless steel belt (
In order to preheat the belt such as 3), auxiliary means such as circulation of a heating medium (steam oil, etc.) inside the tension roll (1) or drive roll (2) may be employed.

The belt placed between the drive roll (2) and the tension roll (1) is heated at a molding pressure of 8 to 15 kg/m2 and at 100°C to
It is suitable to be made of a material that can withstand heating conditions of 180 DEG C. and hydraulic tension of 1 to 10 kg/cm2 and has good thermal conductivity, such as stainless steel belts, steel belts, etc. The tension of the belt is necessary to hold the molded material inserted between the belts (to prevent slipping), to ensure the finish of the laminated sheet, or to rotate the tension roll (1), and there is no need to make it unnecessarily excessive. do not have.

Further, the tension roll (1) itself may be directly driven as long as the rotation speed is the same. The running speed of the belt is determined by the drive roll (
It can be adjusted in the range of 1 to 20 m/min depending on the rotation speed of 2).

Pressurization is performed by a high-pressure empressor (7) equipped with an air pressure of 6 to 15 kg/m2 necessary for molding and the necessary ability to fill and replenish the air pressure lost from the gap between the sealing material and the belt. In addition, carbon block material was used as a sealing material in the examples, but felt material with low gas permeability and polytetrafluoroethylene resin (trade name: Teflon ) may be used.

Examples of the melamine resin molding material used in the melamine resin decorative sheet of the present invention include a paper made from fiber materials such as cellulose fiber, linter fiber, kraft fiber, and synthetic fiber.

Melamine resin is applied to porous substrates such as non-woven fabrics and woven fabrics.
Those impregnated with thoramine/benzo (or aceto)guanamine cocondensation resin, urea/Xlamin cocondensation resin, etc. by coating or dip impregnation can be used.

X Melamine resins can be used in types that have curing properties (gel time) and resin flow characteristics that are matched to the molding temperature or molding time, but as is well known, melamine resins have characteristics depending on the reaction conditions or the presence of co-condensates. Various resin types can be synthesized, and molding conditions such as the length of the pressurizing chamber, molding speed, and molding pressure can be adjusted in addition to the molding temperature and molding time.

Further, by adjusting these molding conditions, it is possible to match the molding conditions of a specific melamine resin.

The molding material to be laminated and integrated with the melamine resin molding material is parchment paper or gramine paper, which has excellent wet oil strength, interlaminar strength, tear strength, etc.

The laminated structure of the melamine resin molding material and these molding materials is as shown in FIG. An example of laminated construction as shown in Figure 5 in which molding material is laminated and integrated on the back side of multiple sheets of melamine resin molding material. Overlay layer impregnated with resin (20
) and ■ A core layer (19) made of kraft paper or the like impregnated with a melamine resin with an amount of 100 g/m 2 or more can be adopted in the middle as shown in FIG. 4.

According to the method for manufacturing a melamine resin decorative sheet according to the present invention, continuous molding is possible, resulting in extremely high production efficiency. Furthermore, since it is pressurized using air pressure, it can be pressurized evenly, has a uniform surface finish, and can be molded quickly. At the same time, the only resistance to the belt running is the slip resistance of the sealing material, allowing for extremely smooth operation with no energy loss. Few.

In addition, we use melamine resin molding materials that use melamine resins and melamine co-condensed resins, which have better mold hardening properties than phenol resins, etc., so molding can be done in a short time and the forming speed can be increased. . Furthermore, by selecting the melamine resin and adjusting the molding conditions, melamine resin decorative sheets with various characteristics can be molded.

Furthermore, the melamine resin decorative sheet has excellent flexibility and processability, and has good interlaminar strength and tear strength, etc.
Molding materials such as glassine paper are laminated and integrated into the middle layer or back layer, which alleviates the drawbacks of melamine-based resins that are hard and easily breakable. The chip will disappear. These melamine resin decorative sheets can be used not only as decorative materials, but also as backers used to prevent warping of wood and moisture-proofing materials, and as electrical insulating materials.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a molding device used to manufacture the melamine resin decorative sheet of the present invention, Fig. 2 is an enlarged sectional view of the slit portion of the molding device shown in Fig. 1, and Fig. 3 is parchment paper or glassine paper. A cross-sectional view of a melamine resin decorative sheet in which a molding material (13) such as
The figure is a perspective view of a melamine resin decorative sheet in which an overlay layer (20), a patterned paper layer (18), a core layer (19), and a molding material (13) of parchment paper or glassine paper are laminated and integrated. FIG. 2 is a cross-sectional view of a melamine resin decorative sheet with a molding material (13) such as parchment paper or glassine paper laminated and integrated on the back side.

Claims (2)

[Claims] (1) Melanin resin-based molding material impregnated with melanin resin and parchment paper or glassine paper are inserted between two moving sheets of elt, and laminated and integrated by pressurization by air pressure and heating by heating means. An endless melamine resin decorative sheet. (2) Inserting a laminated material made of the melamine resin-based molding material impregnated with the melamine resin of (i) and parchment paper or glassine paper between two running belts (ii) The outer periphery of the running belt (i) (ii) Applying more pneumatic pressure and heating using a heating means to the laminated material to fluidize and harden the melamine resin, as well as laminating and integrating the melamine resin molding and parchment paper or glassine paper. ) A manufacturing method for endless melamine resin decorative sheets.