JPH0849867A - Soft floor heating mat - Google Patents

Abstract

PURPOSE:To suppress the floating of the edge side of a mat and facilitate the winding of the mat by reducing the elongation of a base material sheet at the time of using to feed a heating medium to a conduit. CONSTITUTION:Tube grooves 2 are provided on a base material sheet 1 of thermoplastic resin foam of a heat insulating layer. A conduit 5 for feeding a heating medium is laid in the groove 2, and the surface side is covered with a coating material 6 in a soft floor heating mat. The sheet 1 is formed of a foam made of a propylene alpha-olefin copolymer resin containing 1-30wt.% of an alpha-olefin and having foaming magnification of 10-60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft floor heating mat improved so as to reduce the thermal expansion of a base sheet due to heating during use so as to solve the problem of floating on the edge of the mat.

[0002]

2. Description of the Related Art A flexible soft floor heating mat which uses a heating fluid such as hot water as a heat medium has a pipe groove formed on a base sheet made of a thermoplastic resin foam which serves as a heat insulating layer of the mat. It is generally known that a groove is provided with a conduit for circulating a heat medium, and a coating material is applied to the surface side of the conduit, and the base sheet material has a foaming ratio of 10 to 40 times crosslinked. Polyethylene foam is used (Shokaisho 63-55)
(See publication No. 008).

[0003]

A soft floor heating mat, which is required to have flexibility, needs to have a thin wall thickness, and the matte surface covering material is woven cloth, non-woven cloth, or metal foil such as aluminum or copper. Is used. When the heating fluid is passed through the conduit, the conduit and the base material sheet are heated and expand, while the coating material does not show the corresponding elongation, so the stress generated by this thermal expansion causes the base material The sheet concentrates on the weakest part, that is, the part where a plurality of conduits are gathered and curved, and this causes the mat to float up to the edge side.

Therefore, when a carpet is laid on a mat and used, the carpet is also lifted due to the above-mentioned lifting phenomenon, which leads to lack of stability as well as appearance and discomfort. In addition, when the floor finishing material is laid under the floor finishing material, the floor finishing material may be deformed. Then, there is a risk of being easily injured due to a raised portion or a deformed portion, and there is a risk of being injured.

Incidentally, when the coating material is an aluminum foil, the coating material hardly expands even when the conduit and the base sheet are thermally expanded, so that the mat is largely warped.
Even when the covering material is a non-woven fabric, it partially floats, though not as much as the aluminum foil.

The present invention has been made in view of the above points, and the purpose thereof is to use a specific material for the base material sheet, so that the effect of using the mat such as the feel of the foot and the workability of winding the mat can be obtained. In addition, the present invention also provides a soft floor heating mat in which the amount of elongation of the base sheet during heating is minimized to prevent lifting of the mat edge portion side.

[0007]

In order to achieve the above object, a soft floor heating mat, which is a feature of the present invention, is provided with a piping groove on a base sheet made of a thermoplastic resin foam which is a heat insulating layer, In the soft floor heating mat in which a conduit for circulating a heat medium is laid in this piping groove, and a covering material is applied to the surface side of the conduit, the base sheet has an α-olefin content of 1 to 30 wt% propylene- It is formed of a foam made of an α-olefin copolymer resin and having a foaming ratio of 10 to 60 times. The α-olefin is preferably ethylene or butene-1, and the α-olefin content is preferably 2 to 15% by weight for the reason described later.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a base sheet 1 which is a heat insulating layer
Is propylene having an α-olefin content of 1 to 30% by weight.
Expansion ratio consisting of α-olefin copolymer resin 10 to 60
It is made of double foam. This propylene-α
Examples of the α-olefin of the olefin copolymer resin include ethylene, butene-1, pentene-1, hexene-1 and the like. Among them, ethylene and butene-1 have the flexibility and heat resistance of the sheet. From the viewpoint of balance, butene-1 is particularly preferable from the viewpoint of compression resistance and load resistance.

When the content of α-olefin exceeds 30% by weight, the base sheet is too soft to prevent the mat edge from being lifted up. On the other hand, when it is less than 1% by weight, the rigidity is high. The mat cannot be rolled up too much. The content of α-olefin is preferably 2 to 15% by weight. Further, when the expansion ratio exceeds 60 times, the mat base sheet is too soft to prevent the edge side from being lifted up. On the other hand, when the expansion ratio is less than 10 times, the rigidity is too high to prevent the mat from being rolled up. The expansion ratio is preferably
20 to 50 times.

On the front surface side of the base sheet 1, two to five pipe grooves 2 are provided in a meandering shape in parallel with each other.
The illustrated case is an embodiment in which three piping grooves 2 are provided, and each piping groove 2 is gathered at a portion where both ends face the edge 1a of the base sheet 1, and the gathering portion 3 has a header. 4 are provided. In each pipe groove 2, conduits 5 for separately circulating a heat medium such as hot water are laid, and the start end and the end of these conduits 5 are connected to the inlet 4a and the return port 4b of the header 4, respectively. A soft floor heating mat is formed by covering and adhering the covering material 6 on the surface side of the base sheet 1.

As a method for producing a propylene-α-olefin copolymer resin foam, which is a material for the base sheet 1, pre-expanded particles are filled in a mold and steam-heated to foam. In addition to the in-mold foaming method, an extrusion foaming method may be used, and may be crosslinked or uncrosslinked. Further, the foam is a mixture of low density polyethylene, ethylene-vinyl acetate copolymer resin, ethylene-propylene copolymer rubber, etc. within a range that does not impair the original physical properties of the propylene-α-olefin copolymer resin. You may manufacture using.

The thickness of the base sheet 1 is 3 to 20 mm, and the conduit 5 has a low density of 8 mm in outer diameter and 5 mm in inner diameter when the thickness of the base sheet 1 is 10 mm, for example. It is preferable to use a cross-linked polyethylene, and as the coating material 6, a thermoplastic resin film and its foam, woven fabric, non-woven fabric or metal foil such as aluminum or copper is used.

The soft floor heating mat according to the present invention (butene-
1 made of propylene-butene-1 copolymer resin foam having a content of 10% by weight and propylene having an ethylene content of 3% by weight
The edge side of a conventional soft floor heating mat in which a base sheet made of ethylene copolymer resin foam is used) and a cross-linked polyethylene foam having a foaming ratio of 20 times is used for the base sheet. The results of the experiment of the floating phenomenon of are as shown in the table below, and of course, the present invention is further excellent in terms of foot feel and mat workability.
It was confirmed that the floating phenomenon of the mat can be suppressed to a low level.

The size of the mat used in this experiment is approximately vertical.
2000mm, width about 3000mm, the thickness of the base sheet
10 mm, the conduit is made of a low density polyethylene crosslinked body having an outer diameter of 8 mm and an inner diameter of 5 mm, the coating material is made of an aluminum foil having a thickness of 50 μ, and the heating medium temperature is 60 ° C. The criteria for each evaluation in the table below will be described.

As for the floating on the edge side of the mat, a tufted carpet having a thickness of about 5.5 mm was laid on the soft floor heating mat, and the floating amount after 3 hours of hot water flow was measured. It was evaluated by. ○ is 0 to 5.0 mm, △ is 5.
1 to 10.0 mm, x is 10.1 mm or more.

Regarding the detachment of the conduit from the pipe groove, the condition in which the conduit of the curved pipe portion on the base material sheet crushes the pipe groove wall and leaves the pipe groove is examined 3 hours after passing hot water, and the following criteria It was evaluated by. ○ indicates no abnormality, △ indicates slight deformation of the pipe groove wall, but the conduit does not separate from the pipe groove, × indicates that the conduit crushes the pipe groove wall and separates from the pipe groove, and the surface coating Heaps up the material.

Regarding the touch feeling of the mat, the thickness is about 5.5 m.
The feeling of foot depression when a person stepped on a tufted carpet of m was evaluated 3 hours after passing hot water according to the following criteria. ○: Sinks but feels elasticity, and strongly feels recovery in the recessed part. △: Slightly feels elasticity when recessed, but the recovery in the recessed part is not as good as in ○. ×
Has a strong feeling of sinking, but does not have a sense of recovery in the recessed part.

Regarding the workability of winding the mat, the workability when winding the mat to a diameter of about 30 cm is as follows when the mat is rolled in the lateral direction and stored in a cardboard box for packing of 35 cm × 35 cm × 200 cm (length). It evaluated by the standard of. ○ can be easily rolled in, △
Requires a strong force and a considerable amount of time, but can be caught, ×
Is hard and brittle and cannot be rolled up.

[0019]

[Table 1]

[0020]

The present invention is as described above, and is formed by a foam having a foaming ratio of 10 to 60 and made of a propylene-α-olefin copolymer resin having an α-olefin content of 1 to 30% by weight. The present soft floor heating mat formed by using the base sheet having the above-mentioned structure has a small elongation amount even when heated, and can suppress the floating phenomenon on the edge side of the mat.
Therefore, the risk that the mat will be tripped over and injured will be released, and the soft floor heating mat can be used safely and comfortably. Also, it has excellent compression resistance and load resistance,
As shown in the above table, the mat has workability such as workability for winding the mat.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention with a covering material partially peeled off.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 is a base sheet 2 is a piping groove 5 is a conduit 6 is a covering material

Claims (4)

[Claims] 1. A pipe groove is provided on a base sheet made of a thermoplastic resin foam, which is a heat insulating layer, and a conduit for circulating a heat medium is laid in the pipe groove, and a coating material is applied to the surface side of the pipe. In the soft floor heating mat, the base sheet is α-
A soft floor heating mat, which is formed of a foamed product having a foaming ratio of 10 to 60 times and made of a propylene-α-olefin copolymer resin having an olefin content of 1 to 30% by weight. 2. The soft floor heating mat according to claim 1, wherein the α-olefin is ethylene. 3. The soft floor heating mat according to claim 1, wherein the α-olefin is butene-1. 4. The soft floor heating mat according to claim 1, 2 or 3, wherein the α-olefin content is 2 to 15% by weight.