JP2016173877A - Planar heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar heating element, constituted of a plurality of base materials, capable of handling a function required in accordance with a shape of a place where each base material is disposed and a usage.SOLUTION: A planar heating element 10 includes: a plurality of integrally connected planar base materials 11A, 11B and 11C; an integrally connected heating wire 12 provided on all the base materials; and a connector 13 mounted by being conductively connected to the heating wire 12 on one of the base materials, for supplying power. At least one of the base materials 11A, 11B and 11C and at least the other one of the base materials 11A, 11B and 11C are constituted of different materials.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a planar heating element that is attached to, for example, a vehicle seat, and more particularly to a planar heating element that includes a plurality of base materials made of different materials.

  In recent years, a planar heating element for warming a seated occupant is often attached to a seat surface portion or a back surface portion of a vehicle seat. As this type of planar heating element, there is one in which a cord heater is bonded and fixed to a base material such as a nonwoven fabric (for example, Patent Document 1). Such a planar heating element is attached between the cushion member of the vehicle seat and the cover member that covers the cushion member, and is formed from a plurality of base materials so as to follow the shape of the seat surface portion and the back surface portion of the vehicle seat. Is formed. For example, a planar heating element for a seating surface portion includes a first base material disposed at a central portion of the seating surface portion and second base materials disposed at both side portions of the central portion of the seating surface portion. The sheet heating element is attached to the cover member by accommodating the second base material of the sheet heating element in a pocket provided on the back side of the cover member, and then the cover member is covered with the cushion member. The planar heating element is attached between the cushion member and the cover member.

  Further, in recent years, a ventilation unit is provided on the back side of the cushion member of the vehicle seat (the side opposite to the side on which the occupant is seated) and the cushion member, and air is directed toward the occupant through the ventilation path formed in the cushion member from the ventilation unit. A blower that blows air is used.

Japanese Patent No. 5500792

  However, when the blower unit is attached to the vehicle seat provided with the planar heating element, the planar heating element is provided on the front side of the cushion member (the side on which the occupant is seated). As a result, the ventilation path formed in the cushion member is blocked, and there is a risk that sufficient ventilation cannot be performed. For this reason, a material having good air permeability is demanded as a material for the substrate of the planar heating element. However, when a foamed body such as urethane foam is used as a material having good air permeability, it becomes difficult to accommodate the second base material of the planar heating element in the pocket of the cover member because it is soft, Workability is poor.

  As described above, when the planar heating element is attached to the vehicle seat, in addition to the function of heat generation, the first base material is required to have air permeability, and the second base material is required to have workability. The function required according to the place where each base material is arranged is different. However, in the conventional planar heating element, each base material is made of the same material, and cannot meet the required function.

  The present invention has been made by paying attention to the above-described problems, and provides a planar heating element capable of responding to a required function depending on the shape and use of each substrate of the planar heating element. The purpose is to do.

  The above object of the present invention is to provide a plurality of planar base materials connected in a single connection, a single heat generation line provided on all the base materials, and any one of the base materials, the heat generation line and And a connector for supplying power that is attached in a conductive manner, and is achieved by a planar heating element in which at least one of the base materials and at least one of the other base materials are made of different materials.

According to the above configuration, the plurality of planar base materials connected to each other are not made of the same material, but at least one of the base materials and at least one of the other base materials are different from each other. Therefore, by selecting the material, it is possible to correspond to the function required for each base material according to the shape and application of the place where each base material is arranged.
In addition, by providing heating lines to a plurality of substrates by sewing, bonding, etc. with a sewing machine, each heating wire is compared to a case where heating elements are provided on each of the plurality of substrates and the heating lines are connected to each other. Can be saved, and lead wires for connecting the heating wires are not required, thereby reducing the cost.

  The material constituting at least one of the base materials has higher air permeability than the material constituting at least one of the other base materials, and the material constituting at least one of the other base materials is the base material. It is characterized by higher rigidity than the material constituting at least one of the materials.

  The material includes a double raschel knitted fabric, a foam-formed body provided with a foam, a spunbond nonwoven fabric manufactured by a spunbond method, a needle punching nonwoven fabric manufactured by a needle punching method, and a punching process into a needle punching nonwoven fabric. The perforated nonwoven fabric is selected.

In a place where air permeability is required, it is preferable to use any material of a double raschel knitted fabric, a foam-formed body, or a perforated nonwoven fabric. These have better air permeability than needle punched nonwoven fabrics and spunbonded nonwoven fabrics.
Moreover, it is preferable to use any material of a spunbond nonwoven fabric, a needle punched nonwoven fabric, or a punched nonwoven fabric in a place where workability is required. Since these are stiffer and harder than the double raschel knitted fabric and the foam-formed body, operations such as housing in the pocket of the cover member are easier than the double raschel knitted fabric and the foam-formed body, and workability is good.
In addition, the price per unit area is higher in the order of double raschel knitted fabric, foam formed body, spunbond nonwoven fabric, perforated nonwoven fabric, and needle punched nonwoven fabric, and can be selected in terms of price.

  Each of the substrates is preferably ultrasonically welded to the other substrate.

  By performing ultrasonic welding, it is possible to increase the tensile strength as compared with the case of connecting the substrates using a double-sided tape or an adhesive, and it is possible to increase the heat resistance of the connected portions.

  In preferable embodiment of said planar heating element, the said base material is a 1st base material located in the center part of the seat surface part or back surface part of a vehicle seat, and the seat surface part or back surface part of the said vehicle seat. It is comprised with two 2nd base materials located in the both sides.

  The first base material positioned at the center portion of the seat surface portion or the back surface portion of the vehicle seat is composed of a polyurethane foam formed body including a foam made of polyurethane as a raw material. It is preferable that the 2nd base material located in a both-sides part is comprised from the needle punching nonwoven fabric manufactured by the needle punching method.

According to said structure, when attaching a ventilation unit to the back side of the cushion member of the vehicle seat provided with the planar heating element, forming a ventilation path inside the cushion member, and blowing air from the ventilation unit toward the occupant In the seat portion or the central portion of the back portion, a polyurethane foam formed body having good air permeability is arranged as the first base material, so that the blowing is not hindered and the blowing is sufficiently performed toward the seated occupant. It can be carried out.
In addition, since the needle punching nonwoven fabric having rigidity as the second base material is disposed on both sides of the seat surface portion or the back surface portion, the pockets corresponding to both sides of the seat surface portion or the back surface portion of the cover member of the vehicle seat are provided. The operation | work etc. which accommodate a 2nd base material can be performed easily, and workability | operativity is good.

  According to the planar heating element according to the present invention, the plurality of planar substrates connected to one another are not composed of the same material, but at least one of the substrates and at least one of the other substrates. Are made of materials different from each other, and by selecting a material, it is possible to correspond to a function required for each substrate according to the shape and use of the place where each substrate is arranged.

It is the perspective view which attached the planar heating element which concerns on one Embodiment of this invention to the vehicle seat. It is sectional drawing seen from the AA line of FIG. It is a top view of a planar heating element.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view in which a sheet heating element 10 according to an embodiment of the present invention is attached to a seat surface portion of a vehicle seat (hereinafter, vehicle seat 100), and FIG. 2 is a seat surface portion of the vehicle seat 100. FIG. 3 is a plan view of the sheet heating element 10 of the present invention. In FIG. 1, only the first base material 11A and the second base materials 11B and 11C (described later) are shown as the planar heating element 10, and the planar heating element 10 in FIG. Only the material 11A (described later) is shown.
In the present specification, the front-rear direction indicates the front-rear direction of the vehicle seat 100, the front side indicates the side on which the occupant is seated, and the back side indicates the side opposite to the side on which the occupant is seated.

As shown in FIGS. 1 and 2, the vehicle seat 100 is formed by covering a cushion member 103 with a cover member 101 for a seating surface portion and a cover member 102 for a back surface. In the present embodiment, the planar heating element 10 is disposed between the seat surface portion cover member 101 and the cushion member 103.
In the cover member 101 for the seat surface portion, second base materials 11B and 11C (described later) of the sheet heating element 10 are accommodated in portions on the back surface corresponding to both side portions 106 and 106 of the seat surface portion. A pocket (not shown) is formed, and the planar heating element 10 is attached to the cover member 101 by accommodating the second base materials 11B and 11C in the pocket.

  In addition, a blower unit (not shown) is disposed on the back side of the seat surface portion of the cushion member 103. As shown in FIG. 2, the cushion member 103 is provided with a plurality of holes penetrating from the back side surface to the front side surface of the cushion member 103 as the ventilation path 104 through which air from the blower unit flows.

  As shown in FIG. 3, the sheet heating element 10 includes a plurality of sheet-like base materials 11A, 11B, and 11C connected to one line, and one line of heat generated on all the base materials 11A, 11B, and 11C. A wire 12 and a connector 13 for supplying power that is attached to any one of the base materials 11A, 11B, and 11C while being electrically connected to the heating wire 12 are provided.

The plurality of base materials 11 </ b> A, 11 </ b> B, and 11 </ b> C are made of materials in which at least one of the base materials and at least one of the other base materials are different from each other.
In the present embodiment, the plurality of base materials 11 </ b> A, 11 </ b> B, and 11 </ b> C are the first base material 11 </ b> A positioned at the center portion 105 of the seat surface portion of the vehicle seat 100 and both side portions 106 of the seat surface portion of the vehicle seat 100. , 106 and two second base materials 11B and 11C. 11 A of 1st base materials are comprised from the foam formation body provided with the foam, and 2nd base materials 11B and 11C are comprised from the needle punching nonwoven fabric manufactured by the needle punching method.

In the present embodiment, the foam formed body includes a foam made of polyurethane as a raw material, and the foam formed body of the present embodiment is hereinafter referred to as a urethane foam formed body. The raw material of the foam may be a polyether resin. The foam may be a soft foam or a hard foam. Furthermore, a compression foam and a high density foam may be sufficient.
A tricot knitted base material knitted so that adjacent warp yarns are entangled with each other, warp yarns having loops formed in the warp direction are arranged in the transverse direction. The tricot base material is mainly made of polyester and has a function of preventing the foam from tearing and maintaining the strength of the foam. The foamed product has higher air permeability than the needle punched nonwoven fabric.

The needle punching nonwoven fabric is manufactured by a needle punching method in which a large number of needles (needles) with sharp tips and hooks (hooks) on the side are moved up and down at high speed to repeatedly pierce the fibers so that the fibers are entangled with each other. . The needle punching nonwoven fabric is mainly made of polyester, and has a basis weight of 105 g to 300 g (mass per m ² is 105 g to 300 g). Needle punched nonwoven fabrics are stiffer and stiffer than foamed bodies.

  Note that the above-described material may contain a flame retardant. When a flame retardant is contained, the equipment is difficult to burn even if the temperature of the heating wire 12 exceeds the design temperature, and the flame is difficult to spread even if it is burned.

  11 A of 1st base materials and 2nd base materials 11B and 11C are connected because the connection location 14 is ultrasonic-welded. In addition, the connection of the connection location 14 is not limited to ultrasonic welding, For example, the connection by a double-sided tape, an adhesive agent, and sewing may be sufficient.

  The connector 13 is attached to one end portion of the first base 11 </ b> A in the rearward direction, and is connected to the heat generating wire 12 to be used for supplying power to the heat generating wire 12.

  The heating wire 12 is connected to the first base material 11A and the second base materials 11B and 11C. Specifically, the heating wire 12 extends from the connector 13 provided on the first base material 11A toward the one second base material 11B, enters the second base material 11B, extends in the forward direction, and then turns back. Returning to the first substrate 11A. Then, it extends toward the front end of the first base material 11A, folds back, and returns to the vicinity of the rear end of the first base material 11A. Then, it extends toward the other second base material 11C, enters the second base material 11C, extends in the forward direction, turns back, and returns to the connector 13 of the first base material 11A.

Although the heating wire 12 is attached to the base materials 11A, 11B, and 11C by sewing, the attachment method is not limited to this, and the heat generating wire 12 may be sewn into the base material or bonded by thermal welding or the like.
The heating wire 12 is made of a metal wire, for example, an ETFE wire (a copper nickel wire with a hyflon fluororesin sheath), an FH wire (a nickel chromium wire with an FEP fluororesin sheath), a copper magnesium wire ( Strands with polyurethane coating on the strands), 2-wire heater wires (two layers of copper-tin alloy and pure nickel with a heat-resistant vinyl chloride sheath), etc. Absent. In addition, since the heat generation temperature of the heating wire 12 changes in accordance with the unit resistance values of these metal wires, the unit resistance value of the metal wire is selected so that the heat generation temperature of the desired heat generation wire 12 is obtained.

  In order to manufacture the vehicle seat 100 using such a planar heating element 10, first, the second base material 11 </ b> B, 11 </ b> C of the planar heating element 10 is placed in the pocket on the back side surface of the cover member 101 for the seat surface portion. And the sheet heating element 10 is attached to the cover member 101. Next, the vehicle seat 100 is assembled by covering the vehicle seat 100 with the cover member 101 for the seating surface and the cover member 102 for the back surface.

At this time, the first base 11 </ b> A of the planar heating element 10 is positioned at the central portion 105 of the seat surface portion. Further, the first base 11A is made of a urethane foam formed body having good air permeability. For this reason, the air blow from the air blowing unit is not hindered, and the air can be sufficiently blown toward the seated passenger.
Moreover, since the needle punching nonwoven fabric which has hardness is used for the 2nd base materials 11B and 11C, the operation | work which accommodates the 2nd base materials 11B and 11C in the pocket of the back side surface of the cover member 101 is performed easily. Can work and good workability.

  As described above, according to the planar heating element 10 according to the present invention, the plurality of planar base materials 11A, 11B, and 11C connected to one another are not formed of the same material, but the base material 11A, Since at least one of 11B and 11C and at least one of the other base materials 11A, 11B, and 11C are made of different materials, each base material 11A, 11B, and 11C is arranged by selecting the material. Depending on the shape and application of the place, it is possible to cope with functions required for each base material.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning of this invention.
In the above embodiment, the first base material 11A is made of urethane foam and the second base materials 11B and 11C are made of needle punched nonwoven fabric. However, the first base material 11A can be made of other materials.

  The material of the first base material 11A and the second base material 11B, 11C is a urethane foam formed product and a needle punching nonwoven fabric, a double raschel knitted fabric, and a spunbond nonwoven fabric produced by a spunbond method, You may select from the punching nonwoven fabric which carried out the punching process to the needle punching nonwoven fabric.

  Double raschel knitted fabric integrates the outer and lining fabrics by making the connecting yarn come and go between the outer and inner linings so that a gap is formed between the outer and outer linings to ensure air permeability. It is a material knitted by double raschel knitting, and the material is mainly polyester. Better breathability, cushioning and lighter than spunbond nonwovens, needle punched nonwovens and perforated nonwovens.

  The spunbonded nonwoven fabric is mainly made of polyester, and is manufactured by a spunbond method in which a large number of filaments are extruded from thin holes provided in a spinneret, and are collected and bonded on a belt that travels. Since the spunbond nonwoven fabric is harder than the needle punched nonwoven fabric, the heating wire 12 is easier to sew than other nonwoven fabrics. it can.

  Since the punched nonwoven fabric is punched into the needle punched nonwoven fabric, it has better air permeability, lighter and softer than the needle punched nonwoven fabric.

  The double raschel knitted fabric, spunbonded nonwoven fabric, and perforated nonwoven fabric may contain a flame retardant.

  You may select the raw material of 11 A of 1st base materials from a urethane foam formation body, a double raschel knitted fabric, and a piercing nonwoven fabric as a breathable raw material. Moreover, you may select the raw material of the 2nd base materials 11B and 11C from a needle punching nonwoven fabric, a spun bond nonwoven fabric, and a punched nonwoven fabric as a material with high rigidity and hard workability. However, the same material is not selected for the first base material 11A and the second base materials 11B and 11C.

For example, the first base material 11A may be a double raschel knitted fabric, and the second base materials 11B and 11C may be needle punched nonwoven fabrics. Alternatively, the first base material 11A may be a perforated nonwoven fabric, and the second base materials 11B and 11C may be needle punched nonwoven fabrics.
When such a planar heating element 10 is attached to the cover member 101 of the vehicle seat 100, the double raschel knitted fabric or perforated nonwoven fabric of the first base material 11 </ b> A has good air permeability. Air blowing from the unit is not hindered, and air can be sufficiently blown toward the seated passenger.
Since the second base materials 11B and 11C are made of a hard needle punching nonwoven fabric, it is easy to accommodate the second base materials 11B and 11C in the pockets on the back side surface of the cover member 101, and workability is improved. Is good.

Alternatively, the first base material 11A may be a double raschel knitted fabric, and the second base materials 11B and 11C may be urethane foam formed bodies.
When such a planar heating element 10 is attached to the cover member 101 of the vehicle seat 100, the double raschel knitted fabric of the first base member 11A has good air permeability. Air blowing is not hindered, and air can be sufficiently blown toward the seated passenger.
In addition, since the cushion foamed urethane foam is used for the second base materials 11B and 11C, when the occupant sits on the vehicle seat 100, the two side surfaces of the seat portion can hit the occupant.

Alternatively, the first base material 11A may be a needle punched nonwoven fabric, and the second base materials 11B and 11C may be spunbonded nonwoven fabric.
When such a planar heating element 10 is attached to the cover member 101 of the vehicle seat 100, the needle punching nonwoven fabric has better air permeability than the spunbond nonwoven fabric. The air permeability can be improved as compared with 106. In addition, since the spunbonded nonwoven fabric is used for the second base materials 11B and 11C, the operation of accommodating the second base materials 11B and 11C in the pockets on the back side surface of the cover member 101 is easy and the workability is improved. good. Furthermore, since the needle punching nonwoven fabric and the spunbond nonwoven fabric are cheaper than the double raschel knitted fabric and the urethane forming body, the planar heating element 10 can be manufactured at a low cost.

In addition, the air permeable material used for the first base material 11A may be a material that can sufficiently blow air toward the seated occupant without obstructing air blowing from the air blowing unit. It is not limited to a formed body, a double raschel knitted fabric, or a perforated nonwoven fabric.
In addition, a material having high rigidity and good workability used for the second base materials 11B and 11C may be a material that can easily accommodate the second base materials 11B and 11C in the pocket on the back side surface of the cover member 101. The needle punching nonwoven fabric, the spunbond nonwoven fabric, and the punched nonwoven fabric are not limited.

  Further, the sheet heating element 10 may be provided on the back surface portion of the vehicle seat 100. The planar heating element 10 may be used for a vehicle seat other than an automobile, or may be used for applications other than the vehicle seat 100, for example, steering.

DESCRIPTION OF SYMBOLS 10 Planar heating element 11A, 11B, 11C Several base material 12 Exothermic wire 13 Connector 14 Connection location 100 Vehicle seat 101 Seat surface cover member 103 Cushion member 104 Ventilation path 105 Center part 106 of the seat surface portion of a vehicle seat Both sides of the seat surface of the vehicle seat

Claims (6)

A plurality of planar substrates connected in a single connection;
A unitary heating wire provided on all the substrates;
A power supply connector attached to any one of the base materials in conduction with the heating wire; and
A planar heating element in which at least one of the substrates and at least one of the other substrates are made of different materials.   The material constituting at least one of the base materials has higher air permeability than the material constituting at least one of the other base materials, and the material constituting at least one of the other base materials is the base material. The planar heating element according to claim 1, wherein the planar heating element is higher in rigidity than a material constituting at least one of the materials.   The material is a double raschel knitted fabric, a foam-formed body provided with a foam, a spunbond nonwoven fabric manufactured by a spunbond method, a needle punching nonwoven fabric manufactured by a needle punching method, and a punching process in a needle punching nonwoven fabric The planar heating element according to claim 1, which is selected from the perforated nonwoven fabric.   Each said base material is a planar heating element in any one of Claim 1 to 3 in which the connection location with another base material is ultrasonically welded.   The base material is a first base material positioned at a central portion of a seat surface portion or a back surface portion of the vehicle seat, and two second base materials positioned at both sides of the seat surface portion or the back surface portion of the vehicle seat. The planar heating element according to any one of claims 1 to 4, wherein The first base material is composed of a polyurethane foam-forming body provided with a foam made of polyurethane as a raw material,
The planar heating element according to claim 5, wherein the second base material is constituted by a needle punching nonwoven fabric manufactured by a needle punching method.

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