JPH01294392A - Manufacture of plane warmer - Google Patents

Abstract

PURPOSE:To obtain a plane warmer having good feeling efficiently as to time and cost, by heating two plane base members, between which an adhesive with a large dielectric loss factor is interposed, through dielectric heating to bond these base members together. CONSTITUTION:A heating wire embedded base member 2, which a flexible heating wire 2a is embedded, and heat insulating felt are superposed, and coating 5a of ethylene-vinyl acetate copolymer type emulsion adhesive 5 is applied to the nonwoven fabric 2 by a roll coater 6 on both sides of the nonwoven fabric. A right side cloth 3 is placed on this, and these are interposed between an electrode plate 7 and a vapor absorptive electrode plate 8 and a high frequency electric field is applied therebetween by a high frequency power supply 9 to heat them. At the same time, a decompression device 11 with a trap 10 is actuated to absorb the produced steam efficiently, so that the electric carpet itself is bonded, dried, and solidified in a short time. Thus, a plane warmer having good feeling is obtained very efficiently as to cost and time.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method of manufacturing a planar heating device mainly used as an electric carpet.

BACKGROUND OF THE INVENTION Conventionally, outer fabrics used for electric carpets and the like have been made of nonwoven fabrics such as needle punch felt, French pile, etc., and have relatively smooth surfaces and are hard with no cushioning properties. Smooth outer fabrics such as needle bunch felt can be easily bonded by heat press using hot melt adhesive, whereas raised outer fabrics with good cushioning properties, such as ordinary carpets, do not fluff during the heat press process. There are various difficulties and restrictions in using raised fabric for electric carpets with built-in heaters, as the fabric may fall over. Specifically, the methods for adhering the raised outer fabric to the heater unit include: ■ A method of fusing hot melt adhesive using a hot press. ■ A method of adhering hot melt adhesive at the same time as application. O Using a solvent-based or water-based emulsion adhesive. After coating, there is a method in which adhesives are bonded over time, followed by chemical crosslinking and curing in a short period of time after application of an adhesive.

Problems to be Solved by the Invention However, method (2) has a problem in that the raised pile falls down and the texture is impaired. In addition, in the case of a thick outer fabric, it takes a long time to heat the adhesive. Method (2) is difficult in terms of process and involves large process losses. In the case of the method O, if a solvent is used, the solvent odor is severe, and if an aqueous emulsion is used, a long adhesion time is required. Furthermore, the materials used in method (2) are limited, and there are very few materials that satisfy various performances.

The method for manufacturing a sheet heating device of the present invention solves the problem of poor efficiency and impairing the texture of the outer fabric, and provides a sheet heating device that is efficient in terms of time and cost and has a good texture. The present invention provides a method for manufacturing a tool.

Means for Solving the Problems The method for manufacturing a planar heating device of the present invention that solves the above problems involves heating two planar base materials, an upper and a lower sheet, with an adhesive having a large dielectric loss factor sandwiched between them, using a dielectric heating method. , is a method of bonding two planar base materials, an upper and a lower sheet, for a planar heating device.

Function: According to the above method, the adhesive having a large dielectric loss is dried and solidified by the dielectric heating method, and the two planar substrates, the upper and lower sheets, are bonded together.

Example Hereinafter, the present invention will be explained based on Examples.

(Example 1) As shown in FIGS. 3 and 4, a heat insulating felt 1, a flexible heating wire-embedded base material (also referred to as a non-woven fabric) 2, and a pile (napped) outer fabric 3 are stacked to generate electricity. When making carpet,
A heat-generating wire-embedded base material 2 incorporating two flexible heat-generating wires and a heat insulating felt are layered, and as shown in FIG. Apply adhesive 5 and heat. The nonwoven fabric 2 used at this time was o, 1t! It was thin (M thickness) and could be coated on both sides of the nonwoven fabric through the gaps between the fibers. Cover cloth 3 was placed over this, placed between electrode plate 7 and vapor absorbing electrode plate 8, and a high frequency electric field was applied with a 12 MHz high frequency power source 9.
Heated for 16 seconds. At the same time, the pressure reducing device 11 with the trap 10 is operated to efficiently absorb the generated water vapor,
The electric carpet body could be adhered in a short time and dried and solidified. The adhesive strength obtained by the beading method immediately after adhesion has been evaluated.
It was 2 cm wide.

(Example 2) As shown in FIG. 5, after overlapping the heat insulating felt 1 and the base material 2 with built-in heat generating wires, the same adhesive 5 as in Example 1 was applied using a roll coater 6. , cover with pile outer cloth 3, and
It passed continuously between the counter electrodes 7 and 7b, between the second counter electrodes 7c and 8, and between the third counter electrodes 7d and 711. A high frequency electric field of i2 MHz was continuously applied to these electrodes. Note that the conveyance speed of the conveyor 12 was 30 cm/sec. The vacuum device for the vapor-absorbing electrode plate 8 was also operated continuously. The adhesive strength of the electric carpet body obtained in this manner was 8/9/2C by the peeling method.

(Example 3) In Example 3, surface heating was performed in the same manner as in Example 1 using a solvent-based adhesive in which polyurethane was dissolved in a mixed solvent of butanone and tetrahydrofuran instead of the adhesive 5 in Example 1. I got the ingredients. The characteristics of this planar heating device are similar to those of the first embodiment.

As is clear from the above examples, in the present invention, an aqueous emulsion type adhesive having a high dielectric constant or a polar solvent type adhesive is used as the adhesive. Water and polar solvents have very large dielectric constants and dielectric loss factors. Among organic solvents, protic solvents are suitable for the present invention. As water-based emulsion type adhesives, adhesives whose main components are acrylic TJT resin, ethylene-vinyl acetate copolymer, polyacetic acid M-vinyl, vinyl urethane, maleic anhydride resin, and copolymers thereof are used. It also contains a lot of water and is heated very well by dielectric heating.

Another feature of the present invention is that it is provided with means for absorbing generated steam that efficiently absorbs a large amount of moisture generated during heating and adhesion of C. A vapor-absorbing electrode plate, which is one of the embodiments of this means for absorbing generated vapor, can be obtained by pasting a cloth that has an affinity for vapor and absorbs it onto a metal electrode plate, but it is necessary to replace this cloth from time to time. arise. Desirably, if a large number of holes 8 are made in the metal electrode plate 8 and the holes 8 are formed into a box shape that can be vacuum-suctioned as shown in FIG. 2, steam can be efficiently absorbed and the bonding time can be shortened.

The same applies to solvent-based adhesives; polar solvents, especially proton-based solvents, have a large dielectric loss factor and often generate heat under a high-frequency electric field. As specific solvent-based adhesives, general solvent-based adhesives such as polyurethane, polyamide, vinyl acetate copolymer, rubber-based varnishes, etc. can be used. However, in terms of factory environments, aqueous emulsion systems have lower solvent odor and are more practical.

Further, the dielectric heating method in the present invention is a method for bonding by heating an adhesive having a high dielectric loss factor under a high frequency electric field, and heating bonding can also be performed by applying microwaves.

The high frequency electric field used is in the range of 2 MHz to several lQMHz. Among them, about 6 to 9 QMHz is practical. When applying this dielectric heating method, it is efficient that only the adhesive is heated most of the time, and other substrates are not heated directly. That is, it is important that the dielectric loss factor of the adhesive be orders of magnitude higher than that of other base materials.

The aqueous emulsion type or polar solvent type adhesive in the present invention satisfies this condition.

Even if there is a flexible linear heating wire in the adhesive base material, if the heating wire is continuous and has no breaks, it can be used in a high frequency electric field.
No local heating effect occurs in ζ. Furthermore, even for electric wires coated with soft polyvinyl chloride having a relatively large dielectric constant (ε=5 to 10), the dielectric loss factor of the adhesive used in the present invention is orders of magnitude larger. The method is very effective.

Furthermore, the pile outer fabric in the present invention refers to outer fabrics such as jaggies, touch-and-knits, knits, loops, and 7-piece outer fabrics.

Effects of the Invention As is clear from the above explanation, the present invention provides an efficient manufacturing method for a planar heating device typified by an electric carpet, and is highly efficient in terms of cost and time. , a planar heating device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing a method for manufacturing an electric carpet by dielectric heating in Example 1 of the present invention, and FIG. 2 is a purchasing diagram showing an example of a vapor-absorbing electrode for dielectric heating in the present invention.
3 and 4 are a perspective view and a sectional view showing the structure of an electric carpet, and FIG. 5 is a process diagram showing a method for manufacturing an electric carpet in Example 2. DESCRIPTION OF SYMBOLS 1...Insulating felt, 2...Heating element built-in base material, 3...Pile outer fabric, 5...Water-based emulsion adhesive, etc. ...Roll coater,
7... Electrode plate, 8... Vapor absorbing electrode plate, 9... High frequency power source, 1o... Trap, 11...... Decompression device. Name of agent: Patent attorney Toshio Nakao
2 Figure! “-Suke 1 Town 7 Nilt Figure 4 Figure 5 Da

Claims (6)

[Claims] (1) Two planar substrates, an upper and lower sheet having an aqueous emulsion or polar solvent adhesive and a flexible heating wire arranged between them, are placed between at least a pair of electrodes and heated by dielectric heating, A method for manufacturing a planar heating device, in which moisture or solvent vapor generated during heating is absorbed by a generated vapor absorbing means, and the two planar substrates, the upper and lower sheets, are bonded together. (2) The method for manufacturing a planar heating device according to claim 1, wherein the generated vapor absorption means is integrated with at least one of the dielectric heating electrodes. (3) The method for manufacturing a planar heating device according to claim 1 or 2, wherein at least one pair of electrodes is composed of a plurality of pairs of electrode plates, and the planar heating device is moved continuously or intermittently and bonded. . (4) A nonwoven sheet with flexible heating wires wired and fixed,
2. The method for producing a planar warming device according to claim 1, wherein at least one planar substrate is coated with an emulsion-type or solvent-based adhesive in advance, and the planar substrates are disposed and bonded together. (5) An emulsion adhesive whose main component is one selected from acrylic resin, ethylene-vinyl acetate copolymer, polyvinyl acetate, vinyl urethane, maleic anhydride resin, and copolymers thereof. The method for manufacturing a planar heating device according to claim 1. (6) The method for manufacturing a planar heating device according to claim 1, wherein the upper substrate is made of needle punched felt or pile cloth serving as a heating surface, and the lower substrate is a heat insulating material made of felt or urethane foam. .