JPH11329683A - Sheet-like surface heating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-like surface heating body, very thin, rich in flexibility, excellent in safety, capable of being fixed by nailing, and suitable for floor heating. SOLUTION: In a sheet-like surface heating body 10, a current circuit equipped with a conductive trunk line 2 and conductive branch lines 3A, 3B made by a printing means, and heating surfaces 4 for generating heat by passing a current through the current circuit, are disposed on an under surface of a front side insulating film 1, a back-side insulating film 5 is disposed on the back side of the heating surfaces 4 with a protection film 9 interposed therebetween, then the front side insulating film 1, the protection film 9, and the back-side insulating film 5 are unified by sticking them together in peripheral parts outside the current circuit, and nailing allowing zones are provided outside the current circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped surface heating element, and more particularly to a sheet-shaped surface heating element which is rich in flexibility and suitable for floor heating.

[0002]

2. Description of the Related Art In recent years, as houses have become Westernized, flooring, that is, rooms having a floor plate structure, have become preferred, and floor heating devices have begun to spread accordingly. For example, as shown in Japanese Patent Application Laid-Open No. 8-303802, an electric heating plate formed by sandwiching a sheet-like surface heating element between a protective plate and a heat insulating material is applied to this floor heating device. By arranging the boards on the back of the floorboard or the front of the tatami mat, the floor or the tatami mat can be warmed.

[0003]

However, as described above, the conventional surface heating element for floor heating has a considerable thickness so that the construction is complicated and the flexibility is poor. The construction accuracy is required, and furthermore, the waterproof measures are complicated, resulting in an increase in cost, and further, it is difficult to fix the surface heating element.

[0004] The present invention is a very thin sheet having a high flexibility and a thickness of about 0.5 to 0.8 mm, and is excellent in waterproofness and can be fixed with nails and has good workability. Are provided.

[0005]

According to the present invention, a surface heat-generating portion and a circuit for energizing the surface heat-generating portion are formed by printing means on the lower surface of the front-side insulating film, and the rear-surface insulating film is disposed on the back side. The above problem was solved by bonding the insulating films on the front and back sides around the surface heat-generating portion and providing a marginal portion capable of nailing in the bonded portion.

That is, the sheet-like surface heating element of the present invention extends on both sides from the power supply portion side to the lower surface of the front side insulating film,
And at least two conductive trunks having opposed parallel portions spaced apart from each other, and alternately parallel each other at the opposed parallel portions of the conductive trunk lines from one trunk line to the other, near the parallel portions. The conductive branch line extending by printing is made of a conductive material to form a current circuit, and a current-generating heat-generating substance is printed on a printing area portion of the conductive branch line to form a heating surface, and furthermore, a conductive trunk line is formed. A conductive metal foil tape extending from the power supply unit is adhered to the lower surface of the power supply unit, and the metal foil tape and the conductive trunk wire are connected to the power supply lead wire at the power supply unit. The outer peripheral portion of the conductive trunk is adhered to the surface-side insulating film to form a nailable area outside the conductive trunk. .

The insulating film disposed on the front and back of the sheet-like surface heating element of the present invention is not particularly limited as long as it has insulation, durability and waterproofness. Polyethylene, polyester, polypropylene These composite films can be applied, and the thickness is desirably about 250 to 500 μm. In addition, as the protective film disposed on the back side insulating film, polyethylene, polyester,
A thickness of about 30 to 50 μm selected from polypropylene or the like is sufficient.

[0008] The printing of the conductive trunk and the conductive branch lines forming the electrodes of the heat generating portion is performed by mixing a printing ink with a conductive fine powder, for example, silver fine powder or a mixed fine powder of silver and aluminum. It is preferable to use a conductive paste. Examples of the heat-generating substance for forming a heat-generating surface by printing on the printed area of the conductive branch line include, for example, fine particles of polyethylene glycol which are baked at a high temperature to transform into semiconductors, and phenol resin or carbon black. It is preferable to use a paste obtained by adding the conductive fine particles and a printing ink and kneading them.

The width of the conductive trunk is 10 to 20 mm.
It is preferable that the length of the branch line branching from the trunk line is 1.5 to 3 mm, which is smaller than the width of the trunk line. Then, the conductive trunks are printed on both sides of the heating part from the power supply part to form opposed parallel parts, and the opposed parallel parts are alternately near the parallel parts from one trunk to the other trunk respectively. A current branch circuit is formed by printing a conductive branch line extending in parallel to the conductive branch line, and when a current is supplied to the conductive branch line, the heat generating surface generates heat.

[0010] In order to improve the conductive efficiency of the conductive trunk, a conductive metal foil tape is preferably polymerized and bonded to the conductive trunk using a conductive adhesive. As a conductive metal foil tape coated with a conductive adhesive, for example,
A copper foil tape having a good conductivity with a thickness of 20 to 40 μ in which a conductive adhesive is applied to a copper foil or an aluminum foil tape in which a conductive adhesive is applied to an aluminum foil is preferable.
Then, the conductive function of the conductive trunk can be ensured by polymerizing and bonding this highly conductive metal foil tape to the conductive trunk with a conductive adhesive.

The width of the nailable margin formed outside the conductive trunk by adhering the protective film and the front and back insulating films at the peripheral edge of the surface heating portion is 20 to 20.
About 50 mm is desirable, and it is more convenient to print characters indicating that nailing is possible in this margin.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a sheet-like surface heating element according to the present invention; FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG. 1, and FIG.
FIG. 3 is an enlarged cross-sectional view of a portion taken along line C;
Is a surface-side insulating film, 2 is a conductive trunk, 3A, 3B
Is a conductive branch wire, 4 is a heating surface, 5 is a back side insulating film, and 6 is a power supply unit.

A transparent polyethylene film having a thickness of 400 μm is used as the transparent front-side insulating film 1 in the embodiment of the present invention. As shown in FIGS. 2, 3 and 4, on the lower surface of the transparent front-side insulating film 1, parallel portions 2A, 2A, 2B, between at least two conductive trunks 2 having two stripes and opposed parallel portions 2A, 2B of the conductive trunks 2, 2 from the parallel portions 2A to 2B of the trunk, and from the parallel portions 2B of the trunk. 2A, a plurality of parallel conductive branches 3A alternately extending to the vicinity of the parallel portion 2B and the parallel portion 2A.
And 3B are provided. And this parallel part 2
A, 2B and the conductive branch line 3A. 3B
Is printed with a thickness of 25 μ using a mixed paste of silver fine powder and printing ink, and a current circuit is formed by a conductive trunk and a conductive branch.

The heating surface 4 is made of a substance which generates heat when a current is applied to the printed area portions of the conductive branch lines 3A and 3B. In this embodiment, polyethylene glycol fine particles are baked at a high temperature to transform into semiconductors. A paste obtained by adding and kneading black fine particles and a printing ink is formed on the conductive branch lines 3A and 3B by superimposing printing, and one conductive branch line 3A or 3B is connected to the other conductive branch line 3B or 3A. When a current flows through the heating surface 4, the heating surface 4 generates heat.

Further, on the lower surfaces of the conductive trunks 2 and 2,
Parallel portions 2A and 2B of the conductive trunk parallel to the feeder 6
A copper foil tape having a thickness of about 30 μ is adhered as a conductive metal foil tape 7 to a portion substantially over the entire length thereof by a conductive adhesive. This copper foil tape and conductive trunk 2,
Numeral 2 is connected to the power supply leads 8 at the power supply section 6, and the copper foil tape ensures that power is supplied to the conductive trunks 2 and 2 reliably and satisfactorily. The copper foil tape 7 does not necessarily have to be provided over the entire length of the parallel portions 2A and 2B of the conductive trunk 2 extending from the power supply section 6, as shown by the broken lines in FIGS. Alternatively, the end side of the parallel portion of the conductive trunk line 2 may be omitted.

On the lower surface side of the insulating film 1 on the front surface side on which the conductive trunk line 2, the conductive branch lines 3A and 3B and the heat generating surface 4 are printed as described above, a polypropylene protective film 9 having a thickness of 40 μm is provided. And a back side insulating film 5 of polypropylene having a thickness of 250 μ is overlapped with the printed portion in a non-adhesive state, and the outer peripheral edge of the current circuit formed by the conductive trunk line 2 and the conductive branch lines 3A and 3B. In the part, the front side insulating film 1, the protective film 9
And the back side insulating film 5 is bonded and integrated, and about 2
A sheet-shaped surface heating element 10 having a very small margin having a width of cm, that is, a thickness provided with the nailable area 11 of about 0.75 μm and having a positive temperature coefficient was formed.

The power supply section 6 of the sheet-like surface heating element 10 described above.
The backside insulating film 5 and the protective film 9 of the above-mentioned copper foil tape portion may be provided with small holes 12, 12 for leading out the lead wires 8, 8, as shown in FIG. This is a preferred embodiment of the present invention. This small hole 12,
12 is preferably formed by bonding the insulating films 1 and 5 on the front and back sides and then irradiating with a laser beam. According to the laser beam irradiation processing method, only the portion irradiated with the laser beam is melted and the small holes 12 and 1 are easily formed.
2 can be formed, and there is an advantage that the copper foil tape is not damaged as in the case of forming using a blade. After forming the small holes 12 in this way,
The ends of the lead wires 8, 8 are soldered to the copper foil tape portion and joined together, and the periphery of the small hole 12 portion is insulated with the insulating waterproof tape 1.
By completely covering the lead wires 8, 8 with 3 and drawing out the lead wires 8, the floor heating work becomes easy.

When the sheet-like surface heating element 10 of the present invention is applied to floor heating, a cushioning heat insulating material 20 is laid on the lower surface of the sheet-like surface heating element 10 as shown in FIG. Forming the concave portion 21 in the portion of the sheet-shaped surface heating element 10 where the power supply portion 6 is located helps protection of the sheet-shaped surface heating element 10.
, And does not protrude from the surface of the sheet-like surface heating element 10 and can be prevented from being pressed by the floor plate.

In the embodiment shown in FIG. 1,
Although the sheet-like surface heating element 10 having one heating surface 4 has been described, as illustrated in FIG.
Of the conductive trunk 2 extending from the
A and 2B are printed, and a boundary blank portion having a predetermined width is provided between the opposing parallel portions 2A and 2B. As described above, the parallel portions 2A and 2B are alternately arranged in parallel to the vicinity of the parallel portions. The conductive branch lines 3A and 3B extending are printed and arranged at a plurality of locations, and a heat-generating substance is discontinuously printed on each of the conductive branch lines 3A and 3B to thereby provide various sizes, for example, equivalent to a tatami mat. A sheet-shaped surface heating element 10 having a size can be obtained.

FIG. 8 exemplifies a construction state in which the sheet-like surface heating element 10 of the present invention is applied to floor heating, wherein 22 is a control panel, 20 is a heat insulating material, 23 is a floor plate,
Reference numerals 4 and 4 denote heating surfaces of the sheet-like surface heating element 10, 6 denotes a power supply unit,
24 is an electric wiring, 25 is a thermistor, 26 is a relay box, 27 is an operation line, 28 is a controller, and 29
Indicates a breaker.

[0021]

As described above, the sheet heating element 1 of the present invention is described.
Reference numeral 0 denotes at least two conductive trunks 2, 2 extending on both sides from the power supply unit 6 side and having parallel portions 2A, 2B opposed to each other at intervals on the lower surface of the transparent front-side insulating film 1. Between the parallel portions 2A and 2B of the conductive trunks 2 and 2 opposite to each other, the parallel portions 2A and 2B of one trunk line alternately move from the parallel portions 2A and 2B of the other trunk line to the parallel portions 2B and 2A of the other trunk line. The conductive branch lines 3A and 3B extending in parallel to the conductive branch lines 3A and 3B are printed to form a current circuit, and the heat generating surface 4 is formed by printing a conductive heating substance on the printing area of the conductive branch lines 3A and 3B. Further, conductive metal foil tapes 7, 7 extending from the power supply section 6 are adhered to the lower surfaces of the conductive trunks 2, 2, and the metal foil tapes 7, 7 are connected to the power supply leads 8, 8 at the power supply section 6, Above surface side insulation On the lower surface side of the film 1, a back side insulating film 5 is adhered to the front side insulating film 1 at a peripheral portion outside the conductive trunks 2 and 2 via a protective film 9, so that the outer side of the conductive trunk 2 is formed. Since the nailable area 11 is provided in the peripheral portion, the following effects are obtained.

Since the current circuit and the heat-generating surface are formed by printing, the overall thickness is significantly thinner than that of the conventional surface heat-generating body, and it is highly flexible. It is suitable for floor heating. In addition, there is no disconnection of the current circuit, and there is no danger due to short circuit or poor current supply, so that it can be used safely.

Further, since both the front and back surfaces have excellent insulation properties and are moisture-impermeable, even if water leaks from the floor surface onto the heating surface, there is no trouble and the safety is maintained for a long time. can do.

In addition, since the protective film 9 is not bonded to the current circuit portion and the heat generating surface 4, the current circuit portion and the heat generating surface 4 are not eroded by the adhesive, and the physical property change of the current circuit portion and the heat generating surface 4 does not occur. And the initial performance can be maintained for a long period of time.

Further, since the nailing area 11 is provided on the outer peripheral portion of the conductive trunk, the heating element 1 is avoided by avoiding the current circuit.
0 can be nailed and fixed, and floor heating work can be performed accurately and efficiently.

Furthermore, since the small holes 12 formed in the back side insulating tape 5 and the protective film 9 are formed by a laser beam, they do not damage the metal foil tape. And since the end of the lead wire is connected to the metal foil tape with solder using this small hole, the lead wire is compared with the conventional product which has been caulked with eyelets or other metal fittings. The thickness of the connecting portion is reduced, and the upper surface side of the surface heating element becomes flat when incorporated in floor heating, so that no burden is imposed on the floor finishing material or the surface material of the panel. In addition, only one side of the lead wire connection is required to be insulated and waterproofed, so insulation has been reduced by half.

[Brief description of the drawings]

FIG. 1 is a plan view showing a basic mode of a sheet-like surface heating element of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged cross-sectional view taken along a line BB of FIG. 1;

FIG. 4 is an enlarged cross-sectional view taken along a line CC of FIG. 1;

FIG. 5 is a plan view showing an embodiment of a large sheet-like surface heating element having a plurality of partitioned heating surfaces.

FIG. 6 is an explanatory view of a method of forming a sheet-like surface heating element of the present invention.

FIG. 7 is a perspective view showing a preferred laying point of the sheet-like surface heating element of the present invention.

FIG. 8 is a perspective view exemplifying a construction state of floor heating by the sheet-like surface heating element of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front side insulating film 2 Conductive trunk 2A Parallel part of conductive trunk 2B Parallel part of conductive trunk 3A Conductive branch 3B Conductive branch 4 Heating surface 5 Backside insulating film 6 Power supply part 7 Metal foil tape Reference Signs List 8 Lead wire 9 Protective film 10 Sheet-shaped surface heating element 11 Nailable area 12 Small hole for exit

Claims (2)

[Claims] 1. At least two conductive trunks extending on both sides from a power supply unit side and having parallel portions facing each other at an interval on a lower surface of a front-side insulating film, and a pair of the conductive trunks. In the opposite parallel portion, conductive branches extending in parallel from one main line to the other main line and alternately near the parallel portion are printed with a conductive material to form a current circuit, and the conductive branch is formed. A heating surface is formed by printing a current-generating substance on the printed area of the line, and a conductive metal foil tape extending from a power supply unit is adhered to the lower surface of the conductive trunk. Is connected to the current-carrying lead wire at the power supply section, and a protective film and a back-side insulating film are disposed on the back side thereof, and the outer peripheral edge of the conductive trunk is bonded to the front-side insulating film. A sheet-like surface heating element characterized in that a nailable area is provided outside the conductive trunk line. 2. A small hole for leading out a lead wire is formed by laser beam irradiation processing on a back side insulating film and a protective film facing the metal foil tape of the power supply section,
2. The sheet-shaped surface heating element according to claim 1, wherein a current-carrying lead wire is joined to the metal foil tape through the small hole.