CN116761532A - Heater unit and vehicle seat - Google Patents
Heater unit and vehicle seat Download PDFInfo
- Publication number
- CN116761532A CN116761532A CN202280009726.4A CN202280009726A CN116761532A CN 116761532 A CN116761532 A CN 116761532A CN 202280009726 A CN202280009726 A CN 202280009726A CN 116761532 A CN116761532 A CN 116761532A
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- Prior art keywords
- heater
- structural
- string
- heater unit
- structural yarn
- Prior art date
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Landscapes
- Surface Heating Bodies (AREA)
Abstract
The conventional heater unit has a problem in that it cannot meet both the ventilation requirement and the mechanical strength requirement. The heater unit includes a base material (11) and a string heater (10) provided on the base material (11) and fixed thereto. The base material (11) is formed by combining a structural yarn (11 a) and a nonwoven fabric (11 b) that are disposed in a substantially planar manner with each other. The rope heater (10) is fixed in direct contact with the structural yarn (11 a).
Description
Technical Field
The present invention relates to a heater unit suitable for electric carpets, car seat heaters, etc., and in particular, to a heater unit having excellent ventilation characteristics and mechanical strength.
Background
Conventionally, as a heater unit to be mounted on a vehicle seat to be used as a vehicle seat heater, for example, there is a heater unit configured such that a string-like heater in which a heat fusion bonding portion is provided is wired in a meandering manner on a base material, and the base material and the heat fusion bonding portion are bonded and fixed by heat fusion bonding due to heating and pressurization (for example, refer to patent document 1). In addition, in recent years, as a means for further improving the comfort of the vehicle interior environment, a vehicle seat having an air conditioning device built therein is put into practical use. Specifically, there is known a vehicle seat in which air is blown out from the surface of the vehicle seat by giving ventilation characteristics to a heater unit and a seat cover, and sending the air to the cover side through an air duct formed in the seat (for example, refer to patent document 2).
As a heater unit to be applied to the above-described vehicle seat with an air conditioner built-in, a heater unit having particularly excellent ventilation characteristics is required. Accordingly, known methods for improving ventilation characteristics include the use of a substrate having a plurality of through holes formed therein, a substrate made of a material having excellent ventilation characteristics (for example, a spunbond nonwoven fabric or a spunlaced nonwoven fabric, etc.), and a substrate having a mesh structure as the substrate of the heater unit (refer to patent documents 3 to 7).
CITATION LIST
Patent literature
Patent document 1: japanese patent No. 4202071: clara industries Co., ltd (Kurabe Industrial Co., ltd.)
Patent document 2: japanese patent No. 4999455: clara industries Co., ltd (Kurabe Industrial Co., ltd.)
Patent document 3: japanese patent No. 3991750: songshi electric appliances industry Co., ltd (Matsushita Electric Industrial Co., ltd.)
Patent document 4: japanese unexamined patent application publication No. 2005-285602: songshi electric appliances industry Co., ltd (Matsushita Electric Industrial Co., ltd.)
Patent document 5: published Japanese translation of PCT International patent application publication No. H8-507404: scandmec AB
Patent document 6: japanese unexamined patent application publication No. 2015-74375: TS technology Co Ltd (TS TECHCO., LTD.)
Patent document 7: japanese patent No. 6636825: clara industries Co., ltd (Kurabe Industrial Co., ltd.)
Disclosure of Invention
Technical problem
However, in the base materials of the heater units described in the above patent documents 3 to 6, in exchange for the ventilation property, the mechanical strength is significantly lowered. In particular, when a heater unit to be applied to a vehicle seat repeatedly receives a load generated by a driver or the like sitting on and getting off the vehicle seat, no vehicle seat has yet had a characteristic sufficient to prevent deformation or breakage even with respect to such a load. Further, for a substrate in which a plurality of through holes are formed, since there is only a slight improvement in ventilation characteristics, further improvement in ventilation characteristics is required.
The heater unit described in the above patent document 7 solves the problem of the heater units described in patent documents 3 to 6. However, there is a need for further improvement in ventilation characteristics, and there is a need to reduce the density (basis weight) of nonwoven fabrics. Therefore, as a base material, mechanical strength and rigidity are lowered, and breakage and deformation are more likely to occur. The deformation of the substrate makes work difficult, for example, when the heater unit is arranged in a vehicle seat, it may even result in the heater unit being arranged where the design was originally unwanted. Therefore, as the heater unit, further improvement in mechanical strength or rigidity is required.
The present invention has been made to solve the problems of the related art, and an object thereof is to provide a heater unit having excellent ventilation characteristics and mechanical strength.
Solution to the problem
In order to achieve the above object, a heater unit according to the present invention includes a base material and a string-like heater provided on and fixed to the base material, wherein the base material is made by combining a structural yarn and a nonwoven fabric provided in an approximately planar shape with each other, and the string-like heater is fixed in direct contact with the structural yarn.
Further, it is conceivable that a heat fusion bonding portion is formed on the outermost layer of the string-like heater, and the heat fusion bonding portion is fixed to the nonwoven fabric and the structural yarn by heat fusion bonding.
Furthermore, it is conceivable that the structural yarn is woven or knitted, or that the structural yarn is stacked in a side-by-side orientation (parallel alignment) in different directions and is provided with an opening that is larger than the apparent diameter of the structural yarn.
Further, it is conceivable that the base material is made of a structural yarn and a pair of nonwoven fabrics, and the structural yarn is sandwiched by the pair of nonwoven fabrics.
Further, the vehicle seat according to the present invention has a seat cover and a seat cushion, with the above-described heater unit disposed therebetween.
Further, the heater unit according to the present invention includes a base material and a string heater provided on and fixed to the base material, wherein the base material is made by combining a plurality of structural yarns provided in an approximately planar shape and a nonwoven fabric with each other, the plurality of structural yarns being composed of at least a first structural yarn group linearly provided with respect to a predetermined direction and a second structural yarn group linearly provided with respect to a direction different from the direction of the first structural yarn group, the string heater being provided on the base material in a meandering shape created by a combination of a straight portion and a curved portion, and the straight portion of the string heater being arranged to employ an angle different from the angle of the first structural yarn group and the angle of the second structural yarn group.
Furthermore, it is conceivable that the structural yarn is woven, or that the structural yarn oriented side by side in different directions is stacked and provided with an opening portion that is larger than the apparent diameter of the structural yarn.
Further, it is conceivable that the base material is made of a structural yarn and a pair of nonwoven fabrics, and the structural yarn is sandwiched by the pair of nonwoven fabrics.
Further, it is conceivable that a heat fusion bonding portion is formed on the outermost layer of the string-like heater, and the heat fusion bonding portion is fixed to the nonwoven fabric and the structural yarn by heat fusion bonding.
Further, the vehicle seat according to the present invention has a seat cover and a seat cushion, with the above-described heater unit disposed therebetween.
Advantageous effects of the invention
In general, although reducing the amount of fibers per unit area of the substrate is effective in improving ventilation characteristics, the reduction in the amount of fibers also significantly reduces the mechanical strength and rigidity of the substrate. With the heater unit according to the present invention, tensile strength is generated due to the structural yarn provided in an approximately planar shape. Therefore, even an apparatus having improved ventilation characteristics can have excellent mechanical strength.
Further, since the heat-fused portions and the structural yarns are directly fixed, separation of the string-like heater due to loss of the fibers from the nonwoven fabric can be prevented. Further, since the string-like heater and the structural yarn are tightly integrated, an effect of making the heater unit less likely to be deformed can be produced.
In addition, setting the direction of the structural yarn and the direction of the linear portion of the string-like heater at different angles also makes it possible for the string-like heater to contribute to maintaining the shape of the base material.
Drawings
Fig. 1 is a schematic diagram showing an embodiment of the present invention, which is a plan view showing the configuration of a heater unit;
FIG. 2 is a schematic diagram showing one embodiment of the invention, the schematic diagram being a partial cutaway perspective view showing the configuration of a substrate;
FIG. 3 is a schematic diagram showing one embodiment of the invention, which is a partial cross-sectional side view showing the configuration of a string heater;
fig. 4 is a schematic view showing an embodiment of the present invention, which is a schematic view showing a configuration of a thermo-compression heater production device;
fig. 5 is a schematic diagram showing an embodiment of the present invention, which is a partial perspective view showing how string-like heaters are arranged in a predetermined pattern and shape;
FIG. 6 is a schematic diagram showing one embodiment of the invention, the schematic diagram being an enlarged plan view showing a portion of a heater unit by making a substrate transparent;
FIG. 7 is a schematic diagram illustrating one embodiment of the present invention, the schematic diagram being an enlarged cross-sectional view of a portion of a heater unit;
FIG. 8 is a schematic diagram showing one embodiment of the invention, the schematic diagram being a partial cutaway perspective view partially showing how a heater unit is embedded in a vehicle seat;
Fig. 9 is a schematic diagram showing another embodiment of the present invention, which is a partially cut-away side view showing the configuration of a string heater;
fig. 10 is a schematic diagram showing another embodiment of the present invention, which is a partially cut-away side view showing the configuration of a string heater;
fig. 11 is a schematic diagram showing another embodiment of the present invention, which is a partially cut-away side view showing the configuration of a string heater;
fig. 12 is a schematic diagram showing another embodiment of the present invention, which is a partially cut-away side view showing the configuration of a string heater;
FIG. 13 is a schematic diagram showing another embodiment of the invention, which is a partially cut-away perspective view showing the configuration of a substrate according to another mode;
fig. 14 is a photograph showing one embodiment of the present invention, which is an enlarged photograph showing a characteristic portion of the heater unit; and
fig. 15 is a photograph showing an embodiment of the present invention, which is an enlarged photograph of a cross-sectional view of a characteristic portion of a heater unit.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. These embodiments represent examples assuming that the present invention will be applied to a vehicle seat heater.
First, the configuration of the string heater 10 according to the present first embodiment will be described. The string heater 10 according to the present embodiment is configured as shown in fig. 3. First, there is a heater core 3 made of an aromatic polyamide fiber bundle having an outer diameter of about 0.2mm, and six conductor strands 5a made of a copper alloy wire (TH-SNCC-3) having a strand diameter of 0.08mm and containing tin-plated hard tin alloy arranged side by side are spirally wound on the outer periphery of the heater core 3 at a pitch of about 0.7 mm. Tetrafluoroethylene-hexafluoropropylene copolymer (FEP) is extruded to a thickness of about 0.15mm as the insulating layer 7 to cover the outer circumference of the conductor strand 5a wound on the heater core 3, thereby constituting the heater wire 1. The polyester resin containing the flame retardant was extruded to a thickness of 0.2mm as the heat fusion bonding portion 9 to cover the outer circumference of the heating wire 1. The string heater 10 is configured in this manner and has a finished outer diameter of 1.1 mm. Although the above-described heater core 3 is effective in consideration of flexibility and tensile strength, it is conceivable to use a plurality of heating element wires arranged side by side or stranded in place of the heater core 3. Preferably, the rope heater 10 has sufficient flame retardancy to pass the horizontal combustion test of the fourth edition UL 1581 published in 2008 by itself, since such flame retardancy allows the flame retardancy of the heater unit to be improved.
Next, the configuration of the base material 11 to which the string heater 10 configured as described above is bonded and fixed will be described. As shown in fig. 2, at the rootIn the base material 11 according to the present embodiment, the structural yarn 11a is sandwiched between a pair of nonwoven fabrics 11b and attached by an adhesive. For example, the nonwoven fabric 11b is made of flame-retardant polyester fiber, and has a basis weight of 27g/m 2 A nonwoven fabric having an apparent thickness of about 1 mm. In this case, the structural yarn 11a is a polyester multifilament yarn having an apparent diameter of 0.5 mm. In the base material 11, the structural yarn 11a was flat woven, the mesh pitch was 10mm, the size of the opening 11c was 9.5mm, and the shielding rate was 12.9%. Further, the structural yarn 11a is composed of a first structural yarn group 11x which is linearly arranged in the left-right direction in fig. 2, and a second structural yarn group 11y which is linearly arranged in the front-rear direction in fig. 2. The nonwoven fabric is obtained by spinning a material constituting fibers by melt extrusion and stacking the materials into a web, and is made of filaments (long fibers). The structural yarn 11a is sandwiched between a pair of such nonwoven fabrics 11b, and the structural yarn 11a and the nonwoven fabrics 11b are fixed by an adhesive. The intersection points at which the different structural yarns 11a intersect with each other are also fixed with an adhesive. The base material 11 thus arranged had a total base weight of 100g/m 2 。
Next, a configuration in which the above-described string heater 10 is arranged in a meandering shape on the base material 11 to be bonded and fixed will be described. In the present embodiment, the meandering interval is set to 20mm. Fig. 4 is a schematic diagram showing the configuration of the thermo-compression heater production device 13 for bonding and fixing the string heater 10 to the base material 11. First, there is a thermo-compression jig 15, and a plurality of locking mechanisms 17 are provided on the thermo-compression jig 15. As shown in fig. 5, the lock mechanism 17 is provided with a pin 19, and the pin 19 is inserted into a hole 21 bored in the hot press jig 15 from below. A locking member 23 is mounted on an upper portion of the pin 19 so as to be movable in the axial direction and is constantly biased upward by a coil spring 25. Further, as shown by the virtual line in fig. 5, the string heater 10 will be arranged in a meandering shape by hooking on the lock members 23 of the plurality of lock mechanisms 17.
Turning back to fig. 4, the platen 27 is arranged to be raisable and lowerable over the plurality of locking mechanisms 17. In other words, the string heater 10 is arranged in a meandering shape by hooking on the lock members 23 of the plurality of lock mechanisms 17, and the base material 11 is placed on top of the string heater 10. In this state, the platen 27 was lowered to heat and pressurize the string heater 10 and the base material 11 at 230 ℃ for 5 seconds. Accordingly, the heat-fused portions 9 on the side portions of the string-shaped heater 10 and the heat-fused fibers on the side portions of the base material 11 will be heat-fused, and therefore, the string-shaped heater 10 and the base material 11 will be bonded and fixed to each other. During heating and pressurization due to the descent of the platen 27, the lock members 23 of the plurality of lock mechanisms 17 move downward against the biasing force of the coil springs 25.
As shown in fig. 6, the serpentine shape of the string heater 10 is constructed by combining a straight portion 10a and a curved portion 10b with each other. In so doing, the linear portion 10a of the string-shaped heater 10 is preferably arranged at an angle different from the angle of the first structural yarn group 11x and the angle of the second structural yarn group 11y, as in the present embodiment. As the mechanical strength of the base material 11, although the base material 11 is strong in the direction in which the structural yarn 11a is arranged, the base material 11 becomes more easily deformed with a change in angle for a tensile force of an angle different from the direction in which the structural yarn 11a is arranged. Specifically, when the first structural yarn group 11x and the second structural yarn group 11y are directly routed as in the present embodiment, deformability is highest with respect to the pulling force at an angle of 45 degrees from the first structural yarn group 11 x. By arranging the linear portions 10a of the string-shaped heater 10 at angles different from the angles of the first structural yarn group 11x and the second structural yarn group 11y, deformation is less likely to occur even with respect to tensile forces of different angles. Note that the nonwoven fabric 11b of the substrate 11 is shown transparent in fig. 6.
An adhesive layer may be formed on the surface of the substrate 11 on the side where the string-like heater 10 is not disposed or a double-sided tape may be applied. This is done in order to fix the heater unit 31 to the seat when the heater unit 31 is mounted to the seat.
By performing the above-described operation, the heater unit 31 similar to the vehicle seat heater shown in fig. 1 can be obtained. Note that, the wire is connected to both ends of the string heater 10 and the temperature control device 39 in the heater unit 31, and the string heater 10, the temperature control device 39, and the connector 35 are connected by the wire. Furthermore, a connection to the electrical system of the vehicle (not shown) is established via the connector 35.
Further, the heater unit 31 configured as described above is embedded and arranged in the vehicle seat 41 in the state shown in fig. 8. In other words, as previously described, the heater unit 31 will be coupled to the seat cover 43 or seat cushion 45 of the vehicle seat 41.
In the heater unit obtained in the embodiment described above, since the heat fusion-bonding portion 9 of the string-like heater 10 penetrates into the nonwoven fabric 11b of the base material 11 and surrounds the fibers constituting the nonwoven fabric 11b, the string-like heater 10 and the base material 11 are tightly bonded to each other. In particular, if the base material 11 includes a heat-fusible fiber having a sheath-core structure and the sheath portion has a low melting point, the sheath portion and the heat-fusion bonding portion 9 of the string-like heater will be heat-fused and integrated with each other in a state where the core portion is surrounded. Therefore, the string heater 10 and the base material 11 will be more tightly bonded to each other.
As shown in the enlarged cross-sectional view shown in fig. 7, it is preferable that the heat-fused portion 9 of the string-shaped heater 10 is penetrated out of the nonwoven fabric 11b of the base material 11 until the heat-fused portion 9 is in direct contact with the structural yarn 11a, and the heat-fused portion 9 and the structural yarn 11a are fixed by heat fusion bonding. Since improving the ventilation property of the base material 11 reduces the density (basis weight) of the nonwoven fabric 11b of the base material 11, separation of the string heater 10 due to the loss of fibers from the nonwoven fabric 11b is more likely to occur. Since the heat fusion-bonding portion 9 and the structural yarn 11a are directly fixed, such separation can be prevented. Further, since the string-like heater 10 and the structural yarn 11a are tightly integrated, an effect of making the heater unit less likely to deform can also be produced. Fig. 14 and 15 show enlarged photographs of characteristic portions of the heater unit. Fig. 14 is a photograph of the heater unit taken from the surface of the substrate opposite to the surface to which the string-like heater is fixed. Fig. 15 is a photograph of a section of a heater unit produced by cutting the heater unit along the orientation of the string-shaped heater. Fig. 14 and 15 both show that the heat-fusion bonded portion of the string-like heater surrounds the structural yarn and the heat-fusion bonded portion and the structural yarn are fixed by the heat-fusion bonding.
Note that the present invention is not limited to the above-described embodiments. Various conventionally known string heaters may be used as the string heater 10. Examples of the configuration of the heating wire 1 include twisting or arranging a plurality of conductor strands 5a side by side, winding the conductor strands 5a around the heater core 3, and applying an insulating layer 7 on the outer periphery of the heater core 3 (refer to fig. 3), twisting a plurality of conductor strands 5a covered with an insulating film 5b (refer to fig. 9), arranging a plurality of conductor strands 5a covered with an insulating film 5b side by side as in the above-described embodiment (refer to fig. 10), twisting or arranging a plurality of conductor strands 5a covered with an insulating film 5b side by side, winding the conductor strands 5a around the heater core 3 (refer to fig. 11), and intermittently forming a heat fusion-bonding portion 9 (refer to fig. 12) as in the above-described second embodiment. In addition, temperature sensing lines, short detection lines, etc. may be bundled together. Specific ones of these other aspects will be described below. First, in the configuration shown in fig. 11, seven conductor strands 5a made of a tin-copper alloy wire having a strand diameter of 0.08mm are arranged side by side at a pitch of 1mm and spirally wound on the outer periphery of a heater core 3 made of an aromatic polyamide fiber bundle having an outer diameter of about 0.2mm to constitute a heater wire 1. Note that the conductor strand 5a is covered with an insulating film 5b made of polyurethane having a thickness of about 0.005 mm. A polyethylene resin containing a flame retardant was extruded to a thickness of 0.25mm as the heat fusion bonding portion 9 so as to cover the outer periphery of the heating wire 1. The string heater 10 is configured in this manner and has a finished outer diameter of 0.9 mm.
Examples of the heater core 3 include fibers configured such that the core material thereof is an inorganic fiber (e.g., glass fiber) or an organic fiber (e.g., polyester fiber such as polyethylene terephthalate, aliphatic polyamide fiber, aromatic polyamide fiber, or wholly aromatic polyester fiber), or monofilaments, multifilaments, spun yarns, or an organic polymer material constituting the fiber material thereof, and the circumference of the core material is covered with a thermoplastic organic polymer material. Further, the heater core 3 is enabled to be heat-shrunk and heat-melted so that the core wire is melted and broken due to abnormal heating when the conductor strand 5a breaks, the shrinkage of the core wire causes the wound conductor strand 5a to follow the heater core 3, and the ends of the broken conductor strand 5a become separated from each other. Therefore, the case where the respective ends of the broken conductor strands are not brought into contact with each other or separated from each other or kept in contact within a small contact area (e.g., point contact) can be prevented from abnormal heat generation. Further, when the configuration of the conductor strands 5a insulated by the insulating film 5b is adopted, the heater core 3 does not necessarily need to be made of an insulating material. For example, stainless steel wires or titanium alloy wires may also be used. However, in view of the breakage of the conductor strands 5a, the heater core 3 is preferably made of an insulating material.
Conventionally known conductor strands may be used as the conductor strand 5a, for example, copper wires, copper alloy wires, nickel wires, iron wires, aluminum wires, nichrome wires, copper-nickel alloys, iron-chromium alloys, and silver-containing copper alloy wires containing copper solid solutions and copper-silver eutectic alloys in a fibrous state. Further, conductor strands having various cross-sectional shapes may be used, and so-called rectangular wires may be used in addition to those having a circular cross-section which are generally used. However, when winding the conductor strand 5a around the heater core 3, among those described above, it is advantageous to have a conductor strand that is slightly resilient when winding the heater wire 1. For example, with respect to a silver-containing copper alloy wire including a copper solid solution and a copper-silver eutectic alloy or the like in a fibrous state, although high tensile strength characteristics and excellent tensile strength and bending strength are achieved, there is a high possibility of springback when winding a heating wire. Therefore, such a wire is disadvantageous in that, when the wire is wound on the heater core 3, floating of the conductor strand 5a or breakage of the conductor strand 5a due to an excessive winding tension may occur, and habitual twisting may occur after processing. In particular, when the mode in which the conductor strand 5a is covered with the insulating film 5b is adopted, a restoring force due to the insulating film 5b is additionally applied. Therefore, it is important to select a wire having a low recovery rate as the conductor strand 5a to compensate for the recovery force due to the insulating film 5 b.
Conventionally known resin materials or the like may be used as the insulating film 5b covering the conductor strands 5a, and examples of such resin materials include polyurethane resins, polyamide resins, polyimide resins, polyamide-imide resins, polyester-imide resins, nylon resins, polyester-nylon resins, polyethylene resins, polyester resins, vinyl chloride resins, fluorine resins, and silicone resins. Multiple layers of these materials may be formed. Among these materials, a material having a hot melt is preferably used because the conductor strands 5a can be hot-melted with each other and since the heater wire 1 does not come loose at the time of processing the terminal (for example, for connection with a connection terminal), the workability can be improved. Further, when performing welding as terminal processing, the material of the insulating film 5b preferably has good thermal decomposition properties because workability is significantly improved if the insulating film 5b is removed by heat during welding.
When the above-mentioned conductor strands 5a are arranged or stranded side by side and the conductor strands 5a are wound around the heater core 3, the side by side arrangement is more preferable than the stranding. This is because the side-by-side arrangement makes the diameter of the heat generating core 4 small, and also a smooth surface is achieved. Instead of being arranged side by side or stranded, it is conceivable that the conductor strand 5a may be woven on the heater core 3.
When the insulating layer 7 is formed, the insulating layer 7 may be formed by extrusion or the like, or may cover the insulating layer 7 which is formed in advance into a tubular shape, and the forming method is not particularly limited. The material constituting the insulating layer 7 may also be appropriately designed according to the use mode or use environment of the string-shaped heater, and there are various examples of the material constituting the insulating layer 7, including polyethylene-based resin, polyester-based resin, polyurethane-based resin, polyamide-based resin, vinyl chloride resin, fluorine-based resin, synthetic rubber, fluororubber, vinyl thermoplastic elastomer, and urethane-based thermoplastic elastomer. Further, a protective layer may be formed on the outer periphery of the insulating layer 7.
When the heat fusion-bonding portion 9 is formed on the outer periphery of the heater wire 1, various aspects of the heat fusion-bonding portion are conceivable, such as forming the heat fusion-bonding portion in a linear shape or a spiral linear shape along the length direction of the string-like heater, forming the heat fusion-bonding portion in a dot pattern, or intermittently forming the heat fusion-bonding portion, as shown in fig. 12, in addition to forming the heat fusion-bonding portion on the entire outer periphery of the heater wire. In so doing, it is preferable to make the heat fusion bonding portion discontinuous in the longitudinal direction of the string-like heater, because even when a part of the heat fusion bonding portion is ignited, the ignited part does not spread. Further, if the volume of the hot-melt bonding portion is sufficiently small, even when the hot-melt bonding portion is made of a combustible material, the flame is extinguished quickly due to the lack of the combustible material, and dripping (burned drips) does not occur any more. Therefore, the volume of the hot melt bond is preferably the minimum volume required for maintaining adhesion to the substrate. However, in these respects, the insulating layer 7 or the insulating film 5b is preferably made of a flame retardant material.
As a material constituting the heat fusion-bonding portion 9, a flame retardant polymer composition is preferably used. The flame retardant polymer composition described herein refers to a polymer composition having an oxygen index of 21 or more as measured in accordance with the combustion behavior set forth in JIS-K7201 (1999). Particularly preferred are polymer compositions having an oxygen index of 26 or higher. Examples of the specific material include thermoplastic polymer materials, for example, olefin-based resins, polyester-based resins, polyamide-based resins, vinyl chloride resins, polyurethane resins, modified Noryl resins (polyphenylene ether resins), aliphatic polyamide resins, polystyrene resins, polyolefin-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, and materials obtained by appropriately mixing flame retardants into such thermoplastic polymer materials. Further, examples of the olefin-based resin include high density polyethylene, low density polyethylene, ultra low density polyethylene, linear low density polyethylene, polypropylene, polybutene, ethylene- α -olefin copolymer and ethylene-unsaturated ester copolymer. Examples of the ethylene-unsaturated ester copolymer include an ethylene-vinyl acetate copolymer, an ethylene-methyl (meth) acrylate copolymer, an ethylene-ethyl (meth) acrylate copolymer, and an ethylene-butyl (meth) acrylate copolymer, which may be used alone or a mixture of two or more of these copolymers may be used. In this case, "(meth) acrylate" represents both acrylate and methacrylate. Although the polyester-based thermoplastic elastomer comprises a polyester-polyester Types and polyester-polyether types, but polyester-polyether types have higher adhesion and are therefore preferable. Aliphatic polyamide resins are known as nylons and include n-nylon (n-nylon) synthesized by the condensation polymerization of omega-amino acids and n, m-nylon (n, m-nylon) synthesized by the copolycondensation of diamines and dicarboxylic acids. Examples of n-nylons include nylon 6, nylon 11, and nylon 12, while examples of n, M-nylons include nylon 66, nylon 610, nylon 6I, nylon 6T, nylon 9T, and nylon M5T. As the polyamide-based thermoplastic elastomer, a block copolymer using polyamide as a hard segment and polyether as a soft segment is known. Various examples of polyamides used as the hard segment are conceivable, including aromatic polyamides such as para-aramid and meta-aramid in addition to the aliphatic polyamides described previously. Various examples of polyethers used as soft segments are conceivable, including polyalkylene ether glycols such as polyethylene glycol, poly (1, 2-and 1, 3-) propylene ether glycol, polytetramethylene ether glycol and polyhexamethylene ether glycol, block or random copolymers of ethylene oxide and propylene oxide, block or random copolymers of ethylene oxide and tetrahydrofuran, and polyethers containing dihydric phenols such as bisphenol a and hydroquinone. Among the above materials, when a nonwoven fabric made of polyester fibers is used as a substrate, preferred is a polyamide-based thermoplastic elastomer having particularly excellent adhesion at high temperature and providing good compatibility in terms of melting point and adhesion, more preferred is a block copolymer of aliphatic polyamide and polyalkylene ether glycol, and particularly advantageous is a block copolymer of nylon 11 or nylon 12 and polytetramethylene ether glycol. Although materials may be selected alternatively from these materials, the selected materials are preferably melted at a temperature equal to or lower than the decomposition start temperature or equal to or lower than the melting point of the material constituting the insulating film 5b or the insulating layer 7 described above. Further, examples of materials having excellent adhesion to the substrate are polyester-based thermoplastic elastomers. In addition, in order to achieve easy bonding with the base material and to ensure bonding strength after bonding, the melt flow rate of the material constituting the thermal fusion bonding portion 9 is preferably 5.0cm 3 /10 minutes or more. According to JIS K7210: 1999, method A, measuring melt at a temperature of 200℃and a load of 2.16 kgFlow rate. Examples of the flame retardant include metal hydrates such as magnesium hydroxide and aluminum hydroxide, antimony oxide, melamine compounds, phosphorus-based compounds, chlorine-based flame retardants, and bromine-based flame retardants. These flame retardants may be appropriately surface-treated using known methods. In particular, a surface treatment that reduces viscosity during melting of the polymer composition constituting the thermal fusion bonding portion 9 is preferable. Further, the method of forming the heat fusion-bonded portion 9 is not particularly limited, and for example, the heat fusion-bonded portion 9 may be formed by known extrusion or application. Note that in the present invention, the adhesive strength between the string-like heater and the base material is particularly important. When the adhesive strength is insufficient, since the base material and the string heater become separated by repeated use, as a result, an unexpected bend is applied to the string heater, and there is a possibility that the conductor strand breaks.
Further, when a string-like heater similar to that shown in fig. 3 is used, a good electric conductor (e.g., a metal foil) may be wound around a part of the outer circumference of the conductor strand 5a in the length direction. Further, when a string-like heater similar to that shown in fig. 3 is used, a good electric conductor (e.g., a metal foil) may be wound around a part of the outer periphery of the heater core 3 (the inner surface of the conductor strand 5 a) in the length direction. As a result, since electric power is conducted through the good electric conductor, but is hardly conducted through the conductor strand 5a in the portion around which the good electric conductor is wound, heat generation no longer occurs in the portion. Thus, it is conceivable that the good electrical conductor as described above is wound in a portion where heat generation is not required. Further, the good electrical conductor as described above is wound around the end portion of the string heater so that the portion becomes a lead portion. Therefore, since the heat generating portion and the lead portion are to be formed in a continuous manner, waterproofing can be achieved without performing special treatment for connection or waterproofing. As a result, this configuration is suitable for use in applications requiring waterproof properties, such as humid environments, environments exposed to sprayed water, or environments where deicing is performed.
In addition to providing one string heater 10, two or more string heaters 10 may be arranged. In this case, one string heater and the other string heater may be disposed on the same surface of the base material, or may be disposed on different surfaces of the base material. Furthermore, it is conceivable that the string-like sensor may be arranged together with the string-like heater. As the string-like sensor, a string-like sensor obtained by replacing the heating strand in the string-like heater described above with a detecting strand is conceivable. Conceivable examples of rope-like sensors include: a temperature sensor that measures a change in resistance value due to detection of the temperature of the strand; a temperature sensor that detects conduction through the detection strand due to melting of the insulating material melted at a predetermined temperature; a grip sensor or seating sensor that measures a change in capacitance of the detection strand; and a pressure sensor or load sensor that detects or measures tension or displacement of the detected strand. The string sensor may be similarly disposed on the same surface of the substrate as the string heater or on a different surface of the substrate than the string heater.
As the base material 11, a base material in which a structural yarn 11a and a nonwoven fabric 11b arranged in an approximately planar shape are combined is used. As the structural yarn 11a, for example, a multifilament, a monofilament, a spun yarn, or other various types of structural yarns can be used. Among these modes, multifilaments are preferred due to excellent flexibility and strength. Although the apparent diameter of the structural yarn may be appropriately set depending on the use environment of the heater unit 31 or the like, the apparent diameter is preferably in the range of 0.25mm to 1mm from the viewpoints of flexibility, mechanical strength, and ventilation characteristics. Note that the apparent diameter of the structural yarn is a value obtained by actual measurement, which includes gaps between fibers constituting the structural yarn, and can be approximately calculated according to the following formula.
D＝0.0357×{T/(ρ×φ)}0.5
D: apparent diameter (mm) of structural yarn
T: thickness of structural yarn (tex)
ρ: density (g/cm) of fibers constituting the structural yarn 3 )
Phi: filling factor of structural yarn (ratio of apparent density of structural yarn to density of fiber)
As a material constituting the structural yarn 11a, various types of materials may be used, and examples of the materials include inorganic fibers (e.g., glass fibers, alumina fibers, silica fibers, alumina-silica fibers, and carbon fibers), polyester fibers (e.g., polyethylene terephthalate fibers, polyethylene naphthalate fibers, and polybutylene terephthalate fibers), synthetic fibers (e.g., polyvinyl alcohol fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyethylene fibers, polypropylene fibers, polyacrylonitrile fibers, polystyrene fibers, polyurethane fibers, polyphenylene sulfide fibers, aromatic polyamide fibers, nylon fibers, polyethersulfone fibers, polyetherketone fibers, and tetrafluoroethylene fibers), and natural fibers (e.g., cotton, hemp, flax, silk, and wool). Further, a fiber having a sheath-core structure in which a sheath made of a low-melting material is formed on the outer periphery of a core made of a high-melting material may be used. These materials can be appropriately selected in consideration of use conditions or the like. It is apparent that the structural yarn 11a may be made of a single type of fiber, or the structural yarn 11a may be formed by combining a plurality of types of fibers.
Conceivable examples of the pattern in which the structural yarn 11a is arranged in an approximately planar shape include: the structural yarn 11a is arranged in a meandering shape; the plurality of structural yarns 11a are arranged side by side while being separated at predetermined intervals; arranging the plurality of structural yarns 11a side by side while separating the plurality of structural yarns 11a at predetermined intervals, and then stacking the structural yarns 11a arranged side by side in a plurality of layers such that respective directions of orientation of the side by side arrangement are different from each other; the woven structural yarn 11a (e.g., plain weave, twill weave, satin weave), and the knitted structural yarn 11a (e.g., plain weave, rib weave, double-reverse weave, interlock weave, osmanthus needle weave, jacquard weave, raschel weave, and hook-group weave). In particular, the structural yarn 11a is woven so that the opening portion 11c thereof is larger than the apparent diameter of the structural yarn 11a, or the structural yarn 11a is knitted so that the opening portion 11c thereof is larger than the apparent diameter of the structural yarn 11a, so that sufficient ventilation characteristics can be provided by the opening portion 11 c. Further, due to the structure formed by the weaving or knitting, displacement of the structural yarn 11a can be prevented even when an external force is applied. As the size of the opening 11c, for example, the opening 11c is preferably about 10 times to 30 times the apparent diameter of the structural yarn 11 a. Note that the size of the opening 11c is obtained in a portion where the diameter of the opening 11c is largest, for example, when the opening 11c is square, the length of a diagonal line is adopted as the size of the opening 11 c. Further, from another point of view, the shielding rate of the structural yarn 11a is preferably in the range of 8.8% to 23.2%. The shielding rate is the percentage of the area occupied by the structural yarn 11a per unit area, and the larger the size of the opening 11c, the lower the shielding rate, but the larger the apparent diameter of the structural yarn 11a, the higher the shielding rate, when the size of the opening 11c is unchanged.
Although the angle formed between the first structural yarn group 11x and the second structural yarn group 11y is 90 degrees in the above-described embodiment, it is obvious that the angle may be an angle other than 90 degrees. However, since sufficient mechanical strength with respect to a predetermined direction may not be ensured when the angle is too small, the angle is preferably 45 degrees or more. In addition, in addition to the first structural yarn group 11x and the second structural yarn group 11y, a third structural yarn group, a fourth structural yarn group, and the like at different angles may be used. For example, as shown in fig. 13, it is also conceivable that the base material 11 in which the first structural yarn group 11x, the second structural yarn group 11y, and the third structural yarn group 11z are arranged at 60-degree intervals. In the case of the aspect shown in fig. 13, for example, although the linear portion 10a of the string-shaped heater 10 may be disposed at an angle different from all of the angles of the first structural yarn group 11x, the angles of the second structural yarn group 11y, and the angles of the third structural yarn group 11z, the advantageous effects of the present invention can be sufficiently produced as long as the linear portion 10a of the string-shaped heater 10 is disposed at an angle different from two of the angles of the first structural yarn group 11x, the angles of the second structural yarn group 11y, and the angles of the third structural yarn group 11 z.
As the nonwoven fabric 11b, it is conceivable to form a nonwoven fabric by various methodsExamples of such methods include wet methods, thermal bonding methods, chemical bonding methods, needle punching methods, and water punching methods. As the fibers constituting the nonwoven fabric 11b, various types of materials may be used, and examples of the materials include inorganic fibers (e.g., glass fibers, alumina fibers, silica fibers, alumina-silica fibers, and carbon fibers), polyester fibers (e.g., polyethylene terephthalate fibers, polyethylene naphthalate fibers, and polybutylene terephthalate fibers), synthetic fibers (e.g., polyvinyl alcohol fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyethylene fibers, polypropylene fibers, polyacrylonitrile fibers, polystyrene fibers, polyurethane fibers, polyphenylene sulfide fibers, aromatic polyamide fibers, nylon fibers, polyethersulfone fibers, polyetherketone fibers, tetrafluoroethylene fibers), and natural fibers (e.g., cotton, hemp, flax, silk, and wool). Further, a hot-melt fiber having a sheath-core structure may be used in which a sheath made of a low-melting-point material is formed on the outer periphery of a core made of a high-melting-point material. By using such a heat-fusible fiber, when the heat-fusible bonding portion 9 is formed in the outermost layer of the string-shaped heater 10, since the sheath portion of the heat-fusible fiber and the heat-fusible bonding portion 9 become heat-fusible and are integrated with each other in a state where the core portion of the heat-fusible fiber is surrounded, extremely tight bonding between the string-shaped heater 10 and the base material 11 is achieved. The fibers may be appropriately selected in consideration of use conditions or the like. It is apparent that the nonwoven fabric 11b may be made of a single type of fiber, or that a plurality of types of fibers may be combined to form a mixed nonwoven fabric 11b. Further, as the fibers constituting the nonwoven fabric 11b, filaments (long fibers) having no fiber length or filaments (short fibers) having a predetermined fiber length may be used. Filaments are more preferable because filaments give higher strength as the nonwoven fabric 11b and enable the string heater 10 to be reliably fixed. Further, as the base material 11, a base material having sufficient flame retardancy to pass the flammability test of the FMVSS No. 302 interior material is preferable. FMVSS is an abbreviation for federal motor vehicle safety standard, wherein flammability test of automotive interior materials is specified as standard No. 302. For this purpose, energy is preferably used Flame-retardant fibers that pass a flame-retardant test (e.g., JIS-L1091:1999) can be used as the fibers constituting the structural yarn 11a and the nonwoven fabric 11 b. The use of such flame retardant fibers imparts excellent flame retardant properties to the substrate. The thickness (value measured at the time of drying) of the nonwoven fabric 11b is desirably set to, for example, about 0.6mm to 1.4 mm. This is because when the string-shaped heater 10 and the base material 11 are bonded and fixed to each other by heating and pressurizing, the use of the nonwoven fabric 11b having such a thickness enables the nonwoven fabric 11b to be favorably bonded to 30% or more, preferably to 50% or more of the outer periphery of the string-shaped heater, and thus, a tightly bonded state can be produced. Further, the basis weight (weight per unit area) of the nonwoven fabric 11b is desirably set to about 80g/m for the whole substrate 11 2 To 120g/m2. The nonwoven fabric 11b having such a basis weight can provide superior ventilation characteristics and sufficient mechanical strength.
When the heat-fusible fibers are used in the nonwoven fabric 11b, the mixing ratio of the heat-fusible fibers is preferably 5% or more, and preferably 20% or less. When the mixing ratio of the hot-melt fibers is less than 5%, sufficient adhesion cannot be obtained. On the other hand, when the mixing ratio of the heat-fusible fibers is higher than 20%, the nonwoven fabric becomes hard, which may cause not only discomfort to the seated person but also a decrease in adhesion to the string heater. The mixing ratio of the flame retardant fiber is 70% or more, preferably 70% or more and 95% or less. When the mixing ratio of the flame retardant fiber is less than 70%, a sufficient flame retardant effect may not be obtained. On the other hand, when the mixing ratio of the flame retardant fibers exceeds 95%, the mixing ratio of the hot melt fibers becomes relatively insufficient, and sufficient adhesion cannot be obtained. Note that the sum of the mixing ratio of the hot-melt fibers and the mixing ratio of the flame-retardant fibers is not necessarily 100%, and other fibers may be appropriately mixed.
Further, it is conceivable that the fibers constituting the nonwoven fabric 11b may be colored. For example, in the case where the vehicle seat 41 uses artificial leather or natural leather as the material of the seat cover 43, a plurality of through holes will be formed in the seat cover 43 in order to impart ventilation characteristics because these materials lack ventilation characteristics. When the heater unit 31 is disposed in the above-described vehicle seat 41, the heater unit 31 will be visible from the through hole. Therefore, the color of the fibers constituting the nonwoven fabric 11b is preferably black or a similar type of color to the seat cover so that the nonwoven fabric 11b is as inconspicuous as possible. It is also obvious that it is conceivable that the color of the structural yarn 11a and the string-like heater 10 may be black or a similar type of color to the seat cover.
As a mode of combining the structural yarn 11a and the nonwoven fabric 11b, for example, a mode of adhering the structural yarn 11a provided in a planar shape to one surface of the nonwoven fabric 11b, and a mode of sandwiching the structural yarn 11a provided in a planar shape between a pair of nonwoven fabrics 11b are conceivable. In so doing, for example, it is conceivable to affix the structural yarn 11a and the nonwoven fabric 11b together by an adhesive. Further, when a pair of nonwoven fabrics 11b is used, it is conceivable to adhere sheets of the nonwoven fabrics 11b together by an adhesive. Although various types of adhesives are known, and the adhesives may be appropriately selected in consideration of compatibility with the structural yarn 11a or the nonwoven fabric 11b, the adhesives in consideration of VOC are preferably selected in consideration of recent environmental conditions. Further, using a thermoplastic resin as the material of the fibers of the structural yarn 11a and/or the nonwoven fabric 11b enables the structural yarn 11a and the nonwoven fabric 11b or the sheet of the nonwoven fabric 11b to be bonded together by applying heat and pressure under appropriate conditions in a state where the structural yarn 11a and the nonwoven fabric 11b are stacked on each other. Specifically, for example, a method using a platen such as that described previously or a method involving passing between heated rollers may be used.
Further, when a pair of nonwoven fabrics 11b is used, each of the pair of nonwoven fabrics may be made of a different material. For example, the following modes are conceivable. As one of the sheets of the nonwoven fabric 11b, it is conceivable to select a nonwoven fabric having a high porosity, or in other words, a nonwoven fabric having a small amount of fibers per unit volume. By selecting a nonwoven fabric having a high porosity as the nonwoven fabric 11b on the side of the string-like heater 10 that will be present on the heater unit surface, the string-like heater 10 can be more reliably penetrated into the nonwoven fabric 11b, and the heater unit 31 having a flat shape can be obtained. In addition, a nonwoven fabric having high porosity may be selected as the nonwoven fabric 11b, and the nonwoven fabric 11b may be melted with and filled with another resin to create a composite material. Further, the heater unit 31 to which additional functions are imparted may be realized by combining various types of nonwoven fabrics including nonwoven fabrics having excellent flame retardancy, nonwoven fabrics having high tensile strength, nonwoven fabrics having excellent chemical resistance, nonwoven fabrics having excellent heat resistance, nonwoven fabrics having excellent withstand voltage characteristics, nonwoven fabrics having electromagnetic wave shielding characteristics, nonwoven fabrics having low elasticity, nonwoven fabrics having excellent low-temperature brittleness, and nonwoven fabrics having high (or low) thermal conductivity.
Further, as for the adhesive layer for fixing the heater unit 31 to the seat, when considering the stretchability of the base material 11 or the maintenance of high-quality texture, it is preferable to form the adhesive layer by forming the adhesive layer composed of only an adhesive on a release sheet or the like, and transferring the adhesive layer from the release sheet onto the surface of the base material 11. Further, as the adhesive layer, an adhesive layer having flame retardancy is preferable, and an adhesive layer itself having flame retardancy sufficient to pass the flammability of the FMVSS No. 302 interior material is more preferable. Examples include acrylic polymer pressure sensitive adhesives.
Further, when the string heater 10 is arranged on the base material 11, the string heater 10 may be fixed to the base material 11 by other aspects than an aspect in which the string heater 10 is bonded and fixed to the base material 11 by heat and pressure being applied. For example, the string heater 10 may be fixed to the base material 11 by sewing, the string heater 10 may be fixed to the base material 11 by sandwiching the string heater 10 between and fixing with a pair of base materials 11 having back surface tackiness, or another aspect may be used. When the string heater 10 is fixed to the base material 11, it is preferable to fix the string heater 10 in direct contact with the structural yarn 11a of the base material 11. When the string-like heater 10 is fixed to the base material 11 by sewing, for example, it is conceivable that the base material 11 having the structural yarn 11a provided on the surface thereof, or the base material 11 including the nonwoven fabric 11b having a sufficiently low density (basis weight) is used so that the string-like heater 10 and the structural yarn 11a are sufficiently close to each other, and that the string-like heater 10 and the structural yarn 11a can be brought into close contact with each other by sewing.
The arrangement of the meandering shape in the string heater 10 may also be designed to a predetermined shape by appropriately combining the straight portion 10a and the curved portion 10b according to the object to be heated, the installation position, or the like. Although the straight line portions 10a are preferably arranged at an angle different from the angle of the first structural yarn group 11x and the angle of the second structural yarn group 11y, it is not necessary that all the straight line portions 10a satisfy the arrangement. A portion of the straight portion 10a may be parallel to the first structural yarn group 11x or the second structural yarn group 11y. The advantageous effects of the present invention can be sufficiently produced as long as 50% or more of the areas in the straight line portion 10a of the string-shaped heater 10 that is provided are arranged at an angle different from the angle of the first structural yarn group 11x and the angle of the second structural yarn group 11y.
Industrial applicability
As described in detail above, according to the present invention, a heater unit having excellent ventilation characteristics and mechanical strength can be obtained. The heater unit is suitable for heating devices requiring ventilation characteristics, such as electric carpets, car seat heaters, steering wheel heaters, heating toilet seats, anti-fog mirror heaters, cooking appliances, and heaters for floor heating.
List of reference numerals
10. Rope heater
10a straight line portion
10B curved portion
11. Substrate material
11a structural yarn
11b nonwoven fabric
11c opening part
11x first structural yarn group
11y second structural yarn group
31. Heater unit
41. Vehicle seat
Claims (10)
1. A heater unit, the heater unit comprising: a substrate; and a string heater provided on the base material and fixed to the base material, wherein
The base material is made by combining structural yarn and nonwoven fabric arranged in an approximately planar shape with each other, and
the rope-shaped heater is fixed in direct contact with the structural yarn.
2. The heater unit according to claim 1, wherein a heat fusion bonding portion is formed on an outermost layer of the string-shaped heater, and the heat fusion bonding portion is fixed to the nonwoven fabric and the structural yarn by heat fusion bonding.
3. The heater unit according to claim 1 or 2, wherein the structural yarns are woven or knitted, or the structural yarns oriented side by side in different directions are stacked, and the heater unit has an opening portion that is larger than an apparent diameter of the structural yarns.
4. A heater unit as claimed in any one of claims 1 to 3 wherein the substrate is made of a structural yarn and a pair of non-woven fabrics, and the structural yarn is sandwiched by the pair of non-woven fabrics.
5. A vehicle seat, the vehicle seat comprising: a seat cover; and a seat cushion, wherein the heater unit according to any one of claims 1 to 4 is arranged between the seat cover and the seat cushion.
6. A heater unit, the heater unit comprising: a substrate; and a string heater provided on the base material and fixed to the base material, wherein
The substrate is made by combining a plurality of structural yarns and a nonwoven fabric disposed in an approximately planar shape with each other,
the plurality of structural yarns are composed of at least a first structural yarn group linearly arranged with respect to a predetermined direction and a second structural yarn group linearly arranged with respect to a direction different from the direction of the first structural yarn group,
the string heater is disposed on the base material in a meandering shape created by a combination of straight portions and curved portions, and
the linear portion of the string heater is arranged to adopt an angle different from the angle of the first structural yarn group and the angle of the second structural yarn group.
7. The heater unit of claim 6 wherein the structural yarns are woven or the structural yarns are stacked in a side-by-side orientation in different directions and the heater unit has an opening that is greater than an apparent diameter of the structural yarns.
8. The heater unit according to claim 6 or 7, wherein the base material is made of a structural yarn and a pair of nonwoven fabrics, and the structural yarn is sandwiched by the pair of nonwoven fabrics.
9. The heater unit according to any one of claims 6 to 8, wherein a heat fusion bonding portion is formed on an outermost layer of the string-like heater, and the heat fusion bonding portion is fixed to the nonwoven fabric and the structural yarn by heat fusion bonding.
10. A vehicle seat, the vehicle seat comprising: a seat cover; and a seat cushion, wherein the heater unit according to any one of claims 6 to 9 is arranged between the seat cover and the seat cushion.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-002905 | 2021-01-12 | ||
| JP2021-002906 | 2021-01-12 | ||
| JP2021-012569 | 2021-01-29 | ||
| JP2021012570A JP2022108229A (en) | 2021-01-12 | 2021-01-29 | Heater unit and vehicular seat |
| JP2021-012570 | 2021-01-29 | ||
| PCT/JP2022/000271 WO2022153919A1 (en) | 2021-01-12 | 2022-01-06 | Heater unit and vehicular seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116761532A true CN116761532A (en) | 2023-09-15 |
Family
ID=87948344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280009726.4A Pending CN116761532A (en) | 2021-01-12 | 2022-01-06 | Heater unit and vehicle seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116761532A (en) |
-
2022
- 2022-01-06 CN CN202280009726.4A patent/CN116761532A/en active Pending
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