JPS5926260A - Manufacture of plastic sheet with cloth for vacuum molding - 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] Light door trim, instrument panel, etc.! The present invention relates to a method for manufacturing a cloth-covered plastic sheet for vacuum forming using IIIJ1 as a moon phase for interior parts.

In order to enhance the fashionability of automobile interior parts, textiles are used as a skin material.The manufacturing method for such interior parts has traditionally been to coat a plastic sheet with adhesive.
Fabric is pasted to make a cloth-covered plastic sheet, and all the materials are vacuum-formed to obtain an interior part of the desired shape.Since vacuum forming is usually carried out at a field temperature of about 100 to 180°C, there are Adhesive strength decreases. For example, in the case of an acrylic resin adhesive, the temperature decreases to about 804 at room temperature even at about 80°C. As a result, the adhesive strength is significantly reduced during vacuum forming, and the cloth and plastic sheet become close to each other, making it impossible to obtain a desired molded product.

In addition, the above adhesive is an organic solvent or a solvent adhesive dissolved in water, an emulsion adhesive, and a coating equipment that coats plastic sheets, and a drying equipment that evaporates and dries the solvent or water after painting. L/″h, which requires a large amount of equipment costs.

The present invention can withstand vacuum forming VC at high temperatures and yield 1111 three-dimensional products with complex shapes. The overall purpose of the present invention is to provide a cloth (J7'2) which has a high heat-resistant adhesive strength and which can be installed at a low cost and costs only M coins.

In manufacturing the vacuum-formed R56 fabric consisting of three layers of plastic sheet, hot-melt adhesive, and cloth, 1 (Kyo Molding) was used between the plastic sheet and 71T. Place a hot-melt adhesive having a melting point higher than the processing temperature of 3), heat and melt the pot-melt adhesive with an infrared heater that emits a wavelength that causes the adhesive to generate heat, or Or a plush sheet - Dotan 1. Place the hot-melt adhesive [-- and heat-melt it using the infrared heater described above (- then lay out the cloth to obtain) Llλ4. There are 11 things to do when pressing objects together.

The skin phase fabrics used in the method of Akira Kibu 15 mainly include (-1) nylon, polyester, polyacrylonide I
Synthetic fiber fabrics such as J-type are used, and knit fabrics made of polyurekne yarn or polyacrylonitrile fibers are particularly preferred, as they give a luxurious feel.

These materials not only have advantages in appearance, but also have elasticity that allows them to follow the elongation of plastic during vacuum forming. The fibers of Makoko L et al. have heat resistance at a molding temperature of 150 to 160°C.

The plastic sheet used as the crystalline phase is a material often used in vacuum forming, such as a semi-rigid polyvinyl chloride resin with a thickness of 0.5 to 1 mm, or a composition obtained by blending this resin with an ABS resin.

The hot melt adhesive used to bond the above cloth and plastic sheet together is a so-called "resin solder".
-r-tyrene-21 nityl acrylate copolymer, etc. were used, but Sakuchika also used various types of resins such as polyethylene, polyamide, polyester, and polyurethane as the main component. Compositions containing natural products such as derubene and rosin are available as agents, and therefore can be selected depending on the processing temperature of vacuum forming.

Hot, i]+, l・41 The adhesive is heated in a heating bath in a 1θ1′:, cI rise I [-4, but is a screen, 'J, - type extruder and melted in a heating bath. Then low
) coating, blade coating 21i-f 7j k, and is applied by a special coating device d depending on the shape of the object to be adhered.
In the method of the present invention, adhesive 7-+lI is placed as a solid substance such as a powder or film on a plastic notebook as an object to be adhered for 1 h'', and only a pot-melt adhesive is applied to the plastic sheet or cloth without heating it. Melt it by heating and bring it into contact with 71Ir. Therefore, in the present invention, an infrared M mejiter, particularly a far infrared heater, is used as a heat source, and the wavelength (1) that only the Botmelt Jχ adhesive can selectively absorb is used.
It was eC to irradiate Zen external rays.

Net melt contact N+? When the melt of il is cooled - 3
It can be converted to 1M in 10 seconds, but it has the property of assimilating within 1 second if the paper is stopped. L7 Therefore, when carrying out the entire method of the present invention, consideration must be given to the process arrangement ``6'' so that pressure bonding can be performed immediately after melting.21:
Sh'h.

Embodiments of the invention will now be described with reference to the drawings.

Example 1 A glass sheet 1 mainly made of semi-rigid vinyl chloride, a film 2 of polyester hot-melt adhesive (melting point = 180°C) with a thickness of about 80 μm, and a knitted fabric 3 made of polyurethane synthetic fiber were placed in the same direction. The polyester hot melt adhesive film 2 is heated and melted when the infrared heater 5 irradiates the film with far infrared rays of a wavelength that can be absorbed by the adhesive. The molten material pressurized by the pressure roller 6.6 penetrates into the gap between the knitted fabrics 3, cools loosely, solidifies, and comes into contact with the M layer 7' between the plastic sheet 1.
fr, form.

Even when the thus obtained 41ifJ glass sheet 8 for vacuum forming was vacuum formed by heating to a temperature of 140 to 150° C., the cloth and the plastic sheet did not separate.

Example 2 The same plastic sheet 1 as used in Example IK and a polyurethane-based hot-melt fabric having a thickness of about >80 It;
A film 9 of adhesive (melting point: 1soe) is passed between supporting rollers 4 and 4 while moving in the same direction at 1tC, and far infrared rays of a wavelength that is absorbed by the adhesive are passed through the infrared heaters 5 and 4. When irradiated with , only the polyurethane net melt adhesive film 9 is heated and melted. Next, the polyurethane knitted fabric 3 is fed with the hand F3+J of the pressure roller 6.6, and when it is pressed with the pressure roller 6.6, -1-
71゛A c? 57'k is formed. The cloth-covered plastic sheet 8' for A-beam molding obtained in the manner shown in C has a heat-adjustable adhesive strength k'i*'j- which is obtained by vacuum forming by 11u1, as in the case of Example 1. Na' Rifu (
5 days ago, is itCrl after external radiation irradiation? Riwaretanninto: 3 was supplied by the knit section, whose nose is made of the same material as hot melt adhesive, absorbs infrared rays, and absorbs heat deformation.

It is clear from the above ζ and ko 1itli that μm 1 < 2 according to Ki Tsuramaki's method. The adhesive strength of the cloth-covered plastic sheet for molding with X does not decrease even when the adhesive is applied, and since only the hot melt adhesive is heated and melted by infrared irradiation to form an adhesive layer, there is no need for coating equipment or drying equipment. This results in significant savings in equipment costs and operating costs.

[Brief explanation of drawings]

FIG. 1 shows an explanatory diagram of the first embodiment, and FIG. 2 shows an explanatory diagram of the second embodiment. In the figure, 1...Glasstic sheet 2...Polyester hot melt adhesive film 3
... Polyurethane knitted fabric 4 ... Support roller 5 ... Infrared heater 6 ... Pressure roller 7.7' ... Adhesive layer

Claims (1)

[Claims] Is the melting point higher than the processing temperature of vacuum forming between plastic sheet and cloth? All hot melt adhesive placement 1°a,
Then, heat and melt the hot melt adhesive with a far infrared heater that emits a wavelength that generates heat in the adhesive, or [Place the above real melt adhesive on a plastic sheet] A method for producing a fabric-covered plastic sheet for vacuum forming, which comprises heating and melting the plastic sheet using the infrared heater, layering the fabric anvil, and then fully press-welding the resulting laminate.