JPH04340027A - Electric carpet - Google Patents

Abstract

PURPOSE:To make light-weight and facilitate conveyance and accomodation in a carpet with a thick skin such as an interior carpet, by improving heat insulation of a heat insulator and making thinner the carpet. CONSTITUTION:A heat insulator 3 of silicone rubber 1 containing 10-30 pts. by weigh fine hollow structures 2 and gas produced by heating and destroying the former structures is stuck to a skin 8 via a nonwoven fabric 5, holding a heater 4 therebetween. Hereby, there is ensured an electric carpet which is more inexpensive than prior practice and is improved in heat insulation performance and is further make thinner.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to electric carpets,
Especially regarding its composition.

0002

[Prior Art] Conventionally, the structure of this type of electric carpet is as follows:
As shown in FIGS. 4 and 5.

In FIGS. 4 and 5, the heat insulator 12 is made of felt mainly made of fibers such as wool or polyester, and includes a nonwoven fabric laminated on the top surface of the insulator 12 and a base fabric 6.
An electric carpet 13 having a substantially square planar shape is constructed by laminating a skin 8 in which pile threads 7 mainly made of nylon or polyester are implanted, and a heat generating element 4 is sandwiched between a heat insulator 12 and a nonwoven fabric 5. are doing. electric carpet 13
A connector 10, which is a connection unit for supplying power from a commercial AC power source to the heating element 4 via a controller for controlling temperature, is arranged in one corner of the housing. The heat obtained by the heat generated by the heating element 4 is insulated by the lower side of the heat insulating body 12, radiated from the upper side of the skin 8, and conducted to the soles of people's feet to heat them.

0004

[Problem to be Solved by the Invention] Recently, however, carpets with a thick base fabric 6, long pile threads 7, and a thick outer skin 6 have appeared on the market, called interior carpets, as outer fabric goods become more luxurious. I've been doing it. Therefore, the heat from the heating element 4 is difficult to conduct to the surface of the outer cloth 8, so the heat is conducted to the lower heat insulating body 12, and the original heating effect is deteriorated. For this reason, the heat insulating body 12 having a conventional thickness cannot sufficiently insulate the heat from the heating element 4, and the heat transfer into the insulating body 12 increases, thereby preventing heat radiation from the heat insulating body 12. The problem was that it was necessary. Furthermore, if the heat insulating body 12 is made thicker to improve the heat insulating effect, the weight of the electric carpet 13 is inevitably increased, and the carpet loses its flexibility, making it difficult to carry and store.

[0005] The present invention solves these conventional problems, and aims to improve the heat insulating performance of the heat insulating body and to realize a lightweight electric carpet.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the electric carpet of the present invention has a heating element sandwiched between a heat insulator and an outer skin with a nonwoven fabric interposed therebetween, and a connector connected to the heating element. An electric carpet configured to supply power to the heating element from the heat insulator, an organic polymer comprising 10 to 30 parts by weight of micro hollow bodies mixed in the heat insulating body and gas generated by heating and destruction thereof. It is constructed using foam material.

[0007]

[Function] The electric carpet of the present invention has the above configuration.
Since microscopic hollow bodies that expand when heated are mixed into the organic polymer material in the heat insulator, the foaming rate of the organic polymer material is improved. In addition, by filling a micro hollow body with a gas having low thermal conductivity, and heating and destroying the micro hollow body, the independent conductivity generated by foaming becomes smaller, and the insulation effect can be further improved. This means that the thickness can be made thinner than conventional heat insulators.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric carpet according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, the heat insulator 3 of the electric carpet 9 expands by about 50 to 60 μm when silicone rubber 1 is heated during molding, for example.
The micro hollow bodies 2 are mixed in and foamed. This micro hollow body consists of an outer shell made of thermoplastic resin and a thermally expandable material contained inside the outer shell. For example, this structure has an outer shell of vinylidene chloride-acrylonitrile copolymer, and inside it there is a fluorocarbon 134a that expands when heated.
It is possible to utilize microscopic hollow bodies in which . Mixing the micro hollow bodies 2 having the above structure into the silicone rubber 1,
The micro hollow bodies 2 are broken and foamed in the silicone rubber 1 by heating to 160 to 200°C to obtain the heat insulating body 3. As a result, the closed cells in the silicone rubber 1 are filled with fluorocarbon gas.

[0010] Silicone rubber 1 was molded to a thickness of 5 mm by varying the amount of microscopic hollow bodies 2 mixed therein, and the thermal conductivity was measured for each case.

When silicone rubber was used alone (expansion ratio approximately 5 times), the thermal conductivity was 0.059 W/(m·K), but as the micro hollow spheres 2 were mixed in, the thermal conductivity decreased. , when 30 parts by weight is mixed, the thermal conductivity is 0.040W/
(m・K). This is because by mixing the micro hollow spheres 2 that expand when heated, the closed cells in the foamed silicone rubber 1 are filled with fluorocarbon gas, and the fluorocarbons 134a sealed in the micro hollow bodies 2 are heated. Since the conductivity (approximately 0.01 (W/m・K)) is lower than the thermal conductivity in air (approximately 0.03 (W/m・K)), the insulation performance of the entire foam of silicone rubber 1 is This is because it has improved. The thermal conductivity of the conventional heat insulating body 12 made of felt mainly composed of fibers of polyester 1 shown in FIG. 4 is approximately 0.063 W/(m·K).
The configuration of the heat insulator 3 shown in FIG. 1 has the effect of clearly improving the heat insulation performance. However, if more than 30 parts by weight of the micro hollow spheres 2 are mixed in, the closed cells formed by foaming during the foam molding of the silicone rubber 1 will become larger and the cells will communicate with each other, causing fluorocarbon gas to be released from the foam of the silicone rubber 1. Because it slips out, the insulation performance decreases.

As shown in FIG. 1, a nonwoven fabric 5 is adhered to a foamed heat insulating body 3 of silicone rubber 1 mixed with micro hollow spheres 2 using a water-based emulsion adhesive. A second layer of nonwoven fabric 5 in which a heating element 4 is laminated to a heat insulating body 3, and a first layer of nonwoven fabric 5 in which a thick skin 8 for an interior carpet in which pile threads 7 are implanted in a base fabric 6 are laminated. The heating element 4 is sandwiched and pasted together. Then, as shown in FIG.
A connector 10 made of a molded product such as a synthetic resin is attached to one corner of the peripheral edge of the carpet, and a power cord 11 is connected to the connector 10 to form an electric carpet 9.

[0013] When the electric carpet 9 having the above structure is energized,
As a result of measuring the time required for the surface temperature of the skin 8 to reach 35° C., it took about 8 minutes for the configuration in which the nonwoven fabric in FIG. 1 was 2 mm thick and the heat insulator 3 was 4 mm thick. On the other hand, in an electric carpet with a cross section as shown in FIG. 4, in which the skin 8 and the heat insulator 12 are made of fibers such as wool or polyester, the surface temperature of the skin 8 reaches 35°C in 8 minutes after electricity is applied. In order to achieve this, the thickness of the heat insulator 1 was required to be 9 mm.

From this, the heat insulating body 3 of the electric carpet 9 of this embodiment shown in FIG. 1 has the effect of improving the heat insulating performance and making the heat insulating body itself thinner.

[0015]

Effects of the Invention As is clear from the above description of the embodiments, the electric carpet of the present invention provides the following effects. (1) As a heat insulator, it is composed of a foam made of an organic polymer material that contains microscopic hollow bodies and gas generated by heating and breaking them.
For example, if you fill in a gas with a lower thermal conductivity than air,
Since it is possible to prevent heat conduction due to convection within the closed cells formed in the organic polymer, it is possible to improve the heat insulation performance compared to conventional heat insulators. (2) Even when the skin is thick like an interior carpet, the thickness of the insulation can be made thinner compared to the conventional polyester fiber felt insulation, making the electric carpet more flexible and easier to carry. Become. (3) The insulating material is made of foam such as silicone rubber, so it can be placed on a wooden floor or other board surface, and the insulating material under the carpet will not slip even when sitting or walking on it. The electric carpet will never shift.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of an electric carpet according to an embodiment of the present invention.

[Fig. 2] A perspective view showing the overall configuration of the electric carpet.

[Figure 3] A graph showing the thermal conductivity when the amount of micro hollow bodies containing Freon 134a enclosed in silicone rubber is varied in the heat insulating body of the electric carpet.

[Figure 4] Cross-sectional view showing the main parts of a conventional electric carpet

[Figure 5] Plan view of the electric carpet

[Explanation of symbols]

1 Silicone rubber (organic polymer material) 2 Micro hollow body 3 Heat insulator 4 Heating element 5 Non-woven fabric 6 Base fabric 7 Pile thread 8 Outer skin 9 Electric carpet 10 Connector 11 Power cord

Claims (1)

[Claims] Claim 1: Contains a skin mainly composed of a base fabric and pile yarn, a first layer formed by laminating a nonwoven fabric, 10 to 30 parts by weight of micro hollow bodies, and a gas generated by heating and breaking the hollow bodies. a second layer made of a laminated nonwoven fabric, the heat insulating body being a foam of an organic polymer material made of An electric carpet consisting of a heating element.