JPH03190079A - Bonding of flat heater - Google Patents

Abstract

PURPOSE:To perform efficient bonding in a short time by controlling a voltage impressed between plates as a function having the width between plates as a variable. CONSTITUTION:A heating wire built-in base material 2 with a built-in flexible heating wire 2a and a heat insulating felt 1 are piled together and an aqueous emulsion adhesive 5 consisting of an ethylene-vinyl acetate copolymer is poured on a roll coater 6 while performing coating 5a by the roll coater 6. Surface cloth 3 is put thereon to be made a face-shaped base material 9 for being passed between plates 7. The adhesive is heated, dried and solidified due to a high-frequency electric field between the plates 7 so that the base material 9 is bonded. In this case, provided that a voltage between the plates 7 is V, the width is h, passing speed of the base material 9 is v, the base material 9 can be properly bonded by such control, as (i) having V as a function of h, (ii) v as a function of h, (iii) V as a function of v and (iv) V as the function of h and v.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of adhering 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.

With smooth surface fabrics such as needle punch felt,
While hot-press bonding was easy using hot-melt adhesives, the fleece of raised surface fabrics with good cushioning properties, such as ordinary carpets, would fall down during the heat-pressing process, so an electric heater with a built-in heater was used. There are various difficulties and restrictions in using raised fabric for carpets.

Problems to be Solved by the Invention However, with the above method, there is a problem in that the raised naps fall down and the texture is impaired. In addition, in the case of thick outer fabric,
It was difficult for heat to be transmitted to the center, and the bonding heating time was also long.

The present invention provides a bonding method that is time- and cost-efficient and capable of producing a planar heating device with a good texture by eliminating the problem of inefficiency and impairing the texture of the outer fabric. It is.

Means for Solving the Problems In order to solve the above problems, the planar heating device of the present invention uses an adhesive having a large dielectric loss factor and a flexible heating wire between a pair of electrodes to which a high frequency voltage is applied. When passing two planar substrates arranged at a certain speed at a certain speed, when the voltage applied between the electrodes is V, the width between the electrodes is h, and the speed of the planar substrates is V. , V, 11, and v are controlled in relation to each other.

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

Example The present invention will be explained below based on examples.

As shown in Figs. 2 and 3, when making an electric carpet by sequentially layering heat insulating felt l, flexible linear heat-generating built-in base material (also called non-woven fabric) 2, and fiber cover cloth 3, for example, copper wire The heat-generating wire-embedded base material 2 incorporating the flexible heat-generating wire 2a consisting of A water-based emulsion adhesive 5 is poured and coated 5a with a roll coater 6. Note that the nonwoven fabric 2 is thin and can be coated on both the front and back sides of the nonwoven fabric 2 through the gaps between the fibers. A surface cloth 3 is applied to this to form a planar base material 9, and this is passed between a pair of electrode plates at a certain speed as shown in FIG. A high frequency electric field of, for example, 13.56 MHz is created between the electrode plates 7 by a high frequency power source 8. This high-frequency electric field causes the adhesive to generate heat, dry and solidify, and the planar base material 9 is bonded. Here, the voltage applied between the electrode plates 7 is V, the thickness of the planar base material 9 is t, and the width between the electrode plates 7 is h.
Let V be the speed at which the planar base material 9 passes between the pair of electrode plates 7.

The width between the electrode plates 7 must be changed depending on the thickness t of the planar base material 9, but if the voltage applied between the electrode plates 7 by the high frequency power source 8 is V=ve1wt, the width generated between the electrode plates 7 It becomes an electric field.

(2) When adjusting the width between the electrode plates 7 by adjusting the thickness t of the planar substrate 9, the following two methods can be considered in order to properly bond the planar substrate 9.

<i) Since the electric field E is inversely proportional to the width, h, for example, the voltage V is given the relationship V=αh (α: constant), and the electric field E is kept constant. In other words, the voltage V is defined as a function V(h) whose width is a variable.

(ii) In a space (vacuum) where an electric field E exists, it is necessary to adjust the energy W per unit volume so that a predetermined amount of energy is absorbed by the planar base material 9.

In other words, let the speed V be a function of h, v(h).

■ When adjusting the speed V according to the production amount, the planar base material 9
The following methods can be used to properly adhere the tape.

(in) As the speed V increases, the time that the planar base material 9 stays between the electrode plates 7 becomes shorter. Therefore, the absorbed high frequency energy decreases, so it is necessary to increase the power of the high frequency energy to compensate for this. In other words, voltage V is a function of speed V, V(v).

(2) Also, considering the combined state in the cases (2) and (2) above, the following method can be considered as a method for appropriately adhering the planar substrate 9.

(iv) Voltage V is a function of width and speed V, V(h.

■) Control as follows.

As mentioned above, regarding the voltage 72 width, V(h).

By associating and controlling v(h), V(v), v(h, v), etc., it becomes possible to appropriately bond the planar base material 9.

Effects of the Invention As is clear from the description of the embodiments above, the method for adhering a planar heating device of the present invention allows the adhesive to dry and solidify with the minimum amount of energy necessary even when the conditions change, allowing the surface to be efficiently bonded. It is possible to produce shaped heating equipment.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing an electric carpet bonding method using dielectric heating in one embodiment of the present invention, and FIGS. 2 and 3 are a perspective view and a sectional view, respectively, showing the structure of the electric carpet. ■・・・Heat-insulating felt, 2...Heat-generating built-in base material, 2a...Flexible heat-generating wire, 3...
Outer fabric, 5...Aqueous emulsion adhesive, 7...
... Electrode plate, 8 ... High frequency power supply, 9 ...
... Planar base material.

Claims (4)

[Claims] (1) When passing at a certain speed two planar substrates, upper and lower, with an adhesive with a large dielectric loss factor and a flexible heating wire arranged between a pair of electrode plates to which a high-frequency voltage is applied. In, the voltage applied between the electrode plates is V, and the width between the electrode plates is h.
A method for bonding a planar heating device in which V is controlled as a function of h as a variable. (2) When passing at a certain speed two planar substrates with an adhesive with a large dielectric loss factor and a flexible heating wire placed between a pair of electrode plates to which a high frequency voltage is applied. In the method for adhering a planar heating device, where h is the width between the electrode plates and v is the speed of the planar base material, v is controlled as a function of h as a variable. (3) When passing at a certain speed two planar substrates, upper and lower, with an adhesive material with a large dielectric loss factor and a flexible heating wire arranged between a pair of electrode plates to which a high-frequency voltage is applied. , the voltage applied between the electrodes is V, and the speed of the planar base material is v.
A method for bonding a planar heating device in which V is controlled as a function of v as a variable. (4) When passing at a certain speed two planar substrates with an adhesive material with a large dielectric loss factor and a flexible heating wire placed between a pair of electrode plates to which a high frequency voltage is applied. In, the voltage applied between the electrodes is V, the width between the electrode plates is h,
A method for adhering a planar heating device, in which, where the speed of the planar base material is v, V is controlled as a function of h and v as variables.