WO1998009478A1 - Element chauffant et son procede de production - Google Patents

Element chauffant et son procede de production Download PDF

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Publication number
WO1998009478A1
WO1998009478A1 PCT/US1997/015291 US9715291W WO9809478A1 WO 1998009478 A1 WO1998009478 A1 WO 1998009478A1 US 9715291 W US9715291 W US 9715291W WO 9809478 A1 WO9809478 A1 WO 9809478A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating element
element according
soft material
fabric
conductive
Prior art date
Application number
PCT/US1997/015291
Other languages
English (en)
Inventor
Arthur Gurevich
Arkady Kochman
Original Assignee
Arthur Gurevich
Arkady Kochman
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/705,527 external-priority patent/US6057530A/en
Priority claimed from US08/855,595 external-priority patent/US5824996A/en
Application filed by Arthur Gurevich, Arkady Kochman filed Critical Arthur Gurevich
Priority to JP51198398A priority Critical patent/JP2001525104A/ja
Priority to EP97940706A priority patent/EP0979593A4/fr
Priority to CA002236024A priority patent/CA2236024C/fr
Publication of WO1998009478A1 publication Critical patent/WO1998009478A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/148—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals embracing or surrounding the resistive element
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/002—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment
    • A41D13/005—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment with controlled temperature
    • A41D13/0051—Heated garments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/004—Heaters using a particular layout for the resistive material or resistive elements using zigzag layout
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/005—Heaters using a particular layout for the resistive material or resistive elements using multiple resistive elements or resistive zones isolated from each other
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/011—Heaters using laterally extending conductive material as connecting means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/026—Heaters specially adapted for floor heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/028—Heaters specially adapted for trays or plates to keep food or liquids hot
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/029—Heaters specially adapted for seat warmers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/036—Heaters specially adapted for garment heating

Definitions

  • This invention relates to heating elements, and more particularly to heating elements which are soft, flexible, flat, strong, light and thin, and to their method of manufacture.
  • Heating elements have extremely wide applications in household items, construction, industrial processes, etc. Their physical characteristics, such as thickness, shape, size, strength, flexibility and other characteristics affect their usability in various applications.
  • U.S. patent 3,627,988 describes a method of assembling a surface heater based on carbon fibers consisting of attachment of continuous non-woven carbon fiber material to contact electrodes and to the shape forming layers of fabric by sewing with a thread.
  • the disadvantages of this method are as follows: this method doesn't allow the flexibility of creating heating elements of various shapes and sizes; the manufacturing process is complex and produces hazardous dust during the sewing operation; application of pressure to the surface of the heating element, made of non- woven carbon fabric, significantly increases its electro- conductivity, which, in turn, changes its intended properties; after a period of use under the effect of mechanical forces the non-woven material tends to separate and to form localized lumps affecting usability and performance; this method produces a heater with significant thickness.
  • U.S. patent 4,149,066 to Niibe et al describes a sheet-like thin flexible heater made with an electro-conductive paint on a sheet of fabric.
  • This method has the following disadvantages: the paint has a cracking potential as a result of sharp folding, crushing or punching; the element is hermetically sealed only around its perimeter, therefore lacking adequate wear and moisture resistance; such an element can't be used with high temperatures due to destruction of the underlying fabric and thermal decomposition of the polymerized binder in the paint; the assembly has 7 layers resulting in loss of flexibility and lack of softness.
  • a known method of achieving a flexible flat heating element is by surfacing threads of fabric with carbon particles and various polymers as disclosed in U.S. patent 4,983,814.
  • the resulting heating elements have necessary electro- physical characteristics, but their manufacturing is complex and is ecologically unfriendly because of the use of organic solvents, such as diethylphormamide, methylethylketone and others. Furthermore, this method involves application of an electro- conductive layer only to the surface of threads of fabrics. This layer, electro-conductivity of which is achieved through surface contact of extremely small particles, is susceptible to damage due to external factors, such as friction, bending, etc.
  • This method has the following disadvantages: (a) the wires are enveloped and separated by the tough PTC material which thickens and hardens the heating element (b) the distance between the wires is very limited, due to a nature of the PTC material having a high electrical resistance, this prevents manufacturing of heaters with large heat radiating surface; (c) the heater is limited only to one predetermined highest temperature level, therefore, this heating device is unable to bypass said temperature level when a quick heating at the highest temperature is needed.
  • the present invention seeks to alleviate the drawbacks of the prior art and describes the fabrication of both a carbon carrying fabric heating element and a non-metallic yarn which are economical to manufacture; don't pose environmental hazards; and result in a soft, flexible, flat, strong, thin, and light heating element, suitable for even small and complex assemblies, such as handware.
  • a significant advantage of the proposed patent is that it provides for fabrication of heating elements of various shapes and sizes, with predetermined electrical characteristics; allows for a durable heater, resistant to kinks and abrasion, and whose electro-physical properties are unaffected by application of pressure, sharp folding, punches, small punctures, small cuts and crushing.
  • the first objective of the invention is to provide a significantly safe and reliable heating element which can function properly after it has been subjected to sharp folding, kicking, small punctures, punching or crushing, thereby solving problems associated with conventional flexible heating wires.
  • the electric heating element, of the present invention is made of a carbon carrying conductive fabric or carbon/graphite electrically conductive yarns which possess the following characteristics: (a) high strength; (b) high strength-to- weight ratio; (c) high thermal and electrical conductivity; (d) very low coefficient of thermal expansion; (e) non-flamability; and (f ) softness.
  • the proposed invention comprises continuous or electrically connected separate strips of carbon carrying fabric.
  • An additional embodiment is comprised of continuous or electrically connected separate strips, sleeves, ropes or strands of carbon/graphite yarns, which radiate a uniform heat over the entire heating core surface.
  • a second objective of the invention is to provide maximum flexibility and softness of the heating element.
  • the electric heating element comprised of carbon carrying conductive fabric is made of a very thin (.1 to 3mm, but preferably within the range of 0.2-2.0mm) woven or non-woven carbon carrying fabric, which is cut into continuous or electrically connected strips and patterned to have gaps between the strips.
  • the electric heating element comprised of carbon/graphite electrically conductive yarns contains thin (.05 to 5.0 mm, but preferably within the range of 0.1-2.0 mm) threads, which are woven or stranded into continuous or electrically connected strips, sleeves/pipes, ropes or bundles, then arranged and insulated to have gaps between the electrically conductive media.
  • all the components of the multi-layer heating element assembly are thin, soft and flexible materials.
  • a third objective of the invention is to provide for the uniform distribution of heat without overheating and hot spots, thereby solving the problem of over insulation and energy efficiency.
  • one side of the heating element includes a metallic foil or a metallized material to provide uniform heat distribution and heat reflection.
  • a thin layer of such electro-conducting heat reflecting material is placed above the electro-insulating material prior to lamination to prevent direct electrical contact of metal with the conductive fabric.
  • the soft heating elements of the invention are made without thick cushioning insulation, which slows down the heat delivery to the surface of the heating apparatus .
  • a forth objective of the invention is to provide for ease in the variation of heating power density utilizing the same type of conductive fabric, thereby solving a problem of manufacturing various heating devices with different electric power density requirements.
  • the carbon carrying conductive fabric is stabilized by impregnation with soft filling substances and then cut to desired patterns.
  • the soft filling material can also be used to augment the electro-physical characteristics of the carbon carrying fabric.
  • the yarns in the heating element core are woven or stranded into strips, ropes, sleeves/pipes or bundles with predetermined width, density of weaving and thickness.
  • a fifth objective of the invention is to provide a reliable and strong electrical contact of the conductive fabric with electrodes for electric power delivery, thereby solving a problem of providing a sufficient electrical contact between soft conductive fabric and metal electrodes during assembling of the heating element.
  • the contacts are made of thin metal foil, metallized polymer or thin rigid conductive electrodes which are attached to the ends of the carbon carrying fabric prior to lamination of insulating materials. The electrical contacts are glued to the carbon carrying fabric heating element core by the conductive adhesive and firmly attached to the fabric to provide a sufficient electrical conductivity.
  • conductive adhesive is comprised of carbon/graphite or silver or nickel ingredients.
  • a sixth objective of the invention is to provide for ease of installation of the electric heating elements inside the heating devices , thereby solving a problem of complicated attachment of conventional heating wires over the desired working area of the flexible heating devices.
  • the insulated electric heating element is patterned and manufactured prior to installation to fit the whole desired area of the flexible heating device.
  • a seventh objective of the invention is to provide for ease in manufacturing of the heating element core comprised of carbon/graphite yarns, thereby eliminating a problem of impregnation of the whole fabric with stabilizing or filling materials to enable cutting to a desired pattern.
  • all strips, sleeves/pipes, ropes and threads are woven or stranded into a desired stable shape prior to the heating element manufacturing.
  • An eighth objective of the invention is to provide a temperature self-limiting properties to the heating element core if dictated by the heater design thereby eliminating a need for thermostats.
  • the positive temperature coefficient (PTC) material is utilized in the selected areas of the heating element core.
  • the present invention comprises a heating element which is flat, thin, flexible, soft, strong and light. It is also highly resistant to abrasion, punctures, cuts, punches, sharp folding and crushing. It can be manufactured in various shapes and sizes, and it can be designed for a wide range of parameters, such as input voltage, desired temperature range, desired power density, type of current (AC and DC) and method of electrical connection ( parallel and series).
  • a soft and flexible thin heating element made of electrically conductive carbon carrying fabric is impregnated with a soft filling material. The heating element is shaped by pressing, heat treating and cutting the fabric into a serpentine pattern. The electrodes are attached to the ends of the serpentine strips which are electrically connected in parallel or in series.
  • the fabric heating element core is sealed to form a multi-layer assembly comprising of at least two electrically insulating layers which envelop each strip of the serpentine strips.
  • the method of producing the soft and flexible heating element is also disclosed.
  • the heating element consists of electrically conductive carbon/graphite yarns woven or stranded into strips, ropes, sleeves/pipes or strands of threads.
  • the selected areas of the heating element core are conditioned to impart a variety of electrical properties in said core.
  • the conditioning of the soft woven heating element core may include a positive temperature coefficient (PTC) material to impart temperature self-limiting properties.
  • PTC positive temperature coefficient
  • the heating element core is shaped by folding or assembling of said conductive media into a predetermined pattern.
  • the electrodes are attached to said heating element core and are electrically connected in parallel or in series.
  • the soft heating element core is sealed to form an assembly containing at least one electrically insulating layer which envelops each strip, rope, sleeve/pipe or strand of threads.
  • Fig. 1 is a schematic view of the process of manufacturing the carbon carrying fabric with the soft filling material according to the present invention.
  • Fig. 2 is a perspective view of a heating element according to the preferred embodiment of the present invention.
  • Fig. 3 is an exploded view of the connection of the fabric, contact electrodes, and power cord.
  • Fig. 4 is a plan view of heating elements connected in series according to an embodiment of the present invention.
  • Figs. 5a and 5b are plan views of heating elements connected in parallel according to another embodiment of the present invention.
  • Fig. 6 is a cross section view of a laminated heating element according to an alternate embodiment of the present invention.
  • Fig. 7 is sectional view of a process of applying insulation to a heating element according to an alternate embodiment of the present invention.
  • Fig. 8 is a sectional view of an insulated heating element according to an alternate embodiment of the present invention.
  • Figure 9A shows a plan view of the heating element core electrically connected in series according to the preferred embodiment of the present invention.
  • Figure 9B is a perspective view of the end of the heating element core showing connection of an electrode.
  • Figure 10A is a plan view of the heating element core electrically connected in parallel, where individual strips are shaped in zigzag pattern.
  • Figure 10B is a plan view of the heating element core electrically connected in parallel according to the preferred embodiment of the present invention.
  • Figure 11 is a perspective view of the insulated heating element core electrically connected in parallel, having electrical busses wrapped by the heating element core material and utilizing cut outs.
  • Figure 12A is a perspective view of a fragment of the heating element core electrically connected in parallel, having electrical busses made of woven strips sewn or stapled to the heating element core and having PTC material incorporated longitudinally into said heating element core in selected areas.
  • Figure 12B is a perspective view of a fragment of the heating element core, electrically connected in parallel having electrical busses made of highly conductive threads or thin metal wires woven or sewn into its body and having PTC material incorporated longitudinally into said heating element core in selected areas.
  • Figure 13 shows a plan view of the heating element core having three bus conductors and a PTC material incorporated longitudinally into the body of said heating element core so as to separate two of three busses according to the preferred embodiment of the present invention; said busses are connected to a power source through a power controller.
  • Figure 14 shows a cross-section of the insulated heating element including separate fragments of the heating element core, having PTC material connecting said fragments and providing electrical continuity.
  • Figure 15 shows a cross-section of the insulated heating element including fragment of the heating element core where the bus electrode is enveloped by the PTC material according to the preferred embodiment of the present invention
  • Figure 16 shows a perspective view of a fragment of the heating element core made of a strand or a rope of non-metallic fibers with varying electrical properties, having electrode connector attached to its end by crimping.
  • Figure 17A shows a perspective view of a sleeve/pipe shaped heating element core, having bus electrodes and electrically connected in series according to the preferred embodiment of the present invention.
  • Figure 17B shows a perspective view of a sleeve/pipe shaped heating element core, having bus electrodes and electrically connected in parallel according to the preferred embodiment of the present invention.
  • Figure 17C shows a perspective view of a sleeve/pipe shaped heating element core, having bus electrodes, electrically connected in parallel and having an optional PTC material incorporated into said heating element core according to the preferred embodiment of the present invention.
  • Figure 18A is a plan view of the back side of a garment including a soft heating element according to the present invention.
  • Figure 18B is a perspective view of a vehicle seat including a soft heating element according to the present invention.
  • Figure 18C is a perspective view of a floor assembly including a soft heating element according to the present invention.
  • Figure 18D is a perspective view of a fragment of pipe including a soft heating element according to the present invention wrapped around the pipe.
  • FIG. 1 The first embodiment of the present invention is detailed in Figures 1 through 6.
  • a carbon carrying fabric basis (11) is unrolled from the spool (17), advanced through the driving rollers (30) and is saturated in the impregnation basin (31) with a solution of soft filling material (21).
  • the saturation in the impregnation basin (31) can be successfully substituted by spraying of the solution of soft filling material (21) or application of thin polymer film of the soft filling material at least from one side of carbon carrying fabric (11).
  • the excess soft filling material is than squeezed out by the rollers (19) with an adjustable pressure function; this allows for variation in the amount of the soft filling material left in the carbon carrying fabric depending on design parameters.
  • the carbon carrying fabric (11) is then passed through the curing device (18) where it is subjected to heat and, if necessary, pressure to adequately set and cure the soft filling material (21).
  • the soft filling material acts as fabric stabilizer and enables cutting of the carbon carrying fabric into a desired shape. In addition it may be used to augment the electro-conductive characteristics of the base carbon carrying fabric (11). Therefore, the soft filling material (21) can include conductive particles like graphite, carbon black, or other metal carrying compounds. It is preferable to use nonvolatile oligomeric or polymeric compounds like starch, polyethylene, carboxymethylcellulose, polyurethane as soft filling materials (21).
  • a serpentine shape heating element core (29) is cut out from the stabilized carbon fabric (11). It is preferable that the strips of the carbon fabric serpentine core (29) have an even width.
  • the ends to which the electrodes shall be attached are cleaned of non-conductive material and an optional conductive adhesive or conducting filling material (16) is applied to them. Thin contact electrodes (15) are then attached to the ends of the heating element core (29).
  • the optional holding teeth (25) may be used to achieve a better contact between the fabric and the electrodes.
  • a power cord (20), having a plug (26), is then attached to the contact electrodes (15) utilizing male (23) and female (24) connectors or other known methods which provide sufficient electrical contact.
  • the electrical connection may be made in series or in parallel.
  • An optional heat regulating thermostat (27) and power output adjustment device (22), may be installed, if required, by a listing agency or a design.
  • the most appropriate patterns which allow efficient and economical trimming of the carbon carrying fabric (11) are zigzag and spiral shapes.
  • the parallel connection can be accomplished either by connecting separate strips of the carbon carrying fabric (11) to a conductive bus bar (33) as shown in Fig. 5a, or by cutting the assembly in such a way that the carbon carrying fabric bus strips (34) located at opposite ends of the heating strips are continuous to the heating strips without a break in the carbon carrying fabric material (11) from which they were cut out.
  • the bus strips (34) can be augmented by one or combination of the following methods: affixing highly electro-conductive flexible strips (35) to at least one side of each bus strip ( 34 ) ; interweaving or sewing highly electro- conductive wires through each bus bar ( 34 ) ; or impregnating the bus strips (34) with a highly electro-conductive substance, including but not limited to graphite.
  • heating element core (29), contact electrode (15) and the power cord (20) is then laminated between at least two layers of electro-insulating material (12) with an optional heat reflective layer (13) and a protective layer (14) adhered to heat reflective layer (13).
  • the electro-insulating materials (12) envelop each strip of the heating element fabric core (29), hermetically sealing the gaps between said strips.
  • the complete heating element assembly is then sealed by a pressure device (32) with or without application of heat.
  • the electro-insulating materials (12) envelop each strip of the heating element fabric core (29) sealing the gaps between said strips.
  • a low temperature sealing consists of application of electro-insulating materials (12) having heat resistant adhesive (28) at least on one side of electro-insulating materials (12) facing the heating element fabric core (29).
  • a high temperature sealing consists of heating of electro-insulating materials (12) which results in their fusing in the gaps between the strips of the heating element fabric core (29).
  • a flexible-in-all-directions thin heating element can be utilized for all varieties of commercial and industrial heaters utilizing direct or alternative current.
  • the main advantages of the heating element are the high reliability and safety which are provided by the tightly sealed soft and durable conductive fabric.
  • the heating element has additional advantages in that the thin fabric: enables manufacturing of the thin, soft and uniform heaters without installation of disturbing conventional heater wires; provides high durability of the heating appliances which can withstand sharp folding, punches, punctures, small cuts and compression without decreasing of electrical operational capabilities; provides high tear and wear resistance owing to: (a) high strength of the conductive fabric, (b) enveloping around all of the fabric serpentine pattern with the polymer insulating material; provides high moisture resistance owing to: (a) impregnating of the soft filling material which prevents or significantly slows down penetration of the moisture through the fabric core, (b) sealing of the gaps between the fabric core serpentine by the polymer insulating materials; provides for manufacturing of corrosion and erosion resistant heating element owing to: (a) high chemical inertness of the carbon carrying fabric and (b) hermetic polymer insulation of the whole heating element including connection electrodes and temperature control devices, in utilization in chemically aggressive industrial or marine environments; offers versatility of variation of the electrical conductivity of the fabric core owing to: (a)
  • This feature is extremely important for construction applications (Example: -concrete) or for multi-layer insulation with different thermal expansion properties; consists of a non combustible conductive fabric which does not cause arcing while being cut or punctured during electrical operation; offers high degree of flexibility and/or softness of the heating appliances depending on the type and thickness of insulation; and provides technological simplicity of manufacturing and assembling of said heating element.
  • the process of manufacturing of the insulated heating element can be fully automated, it utilizes the commercially available non toxic and inexpensive products.
  • the insulated fabric core can be manufactured in rolls with subsequent cutting to desired sizes and further attachment of electric power cords.
  • the conductive fabric can include other electrically conductive materials other than carbon, such as electroplated copper, nickel or tin containing coatings on the surface of the carbon carrying fibers;
  • the electrically conductive fabric can consist of ceramic fibers, such as alumina, silica, zirconia, chromia, magnesium, calcia or a combination thereof, coated or impregnated with electrically conductive material such as carbon;
  • the soft filling material can consist of different oligomeric or polymeric compounds, such as polyurethane , polyvinyl-containing products, etc.;
  • the conductive fabric can be cut out into separate strips and subsequently electrically connected to each other in a serpentine form or other desired patterns, including ordinary straight or "U” shaped strips;
  • the electric power cord can be
  • the second embodiment of the invention consists of a non-metallic heating element core made by assembling yarns comprising carbon/graphite fibers as shown in Figures 9-18.
  • the core is woven into various longitudinal forms during textile fabrication, such as strips, sleeves, pipes and ropes. It may also take a form of a strand of threads.
  • the heating element core may, along with electrically conducting carbon/graphite fiber yarns, contain other, electrically non-conducting, yarns in various proportion and weaving patterns in order to augment its electrical resistance.
  • Such yarns have at least one of the following contents:
  • the yarns consist of continuous filament fibers.
  • the heating element core utilizes a woven product in its final form, therefore eliminating a step of treatment of the whole core material with stabilizing substances, prior to cutting of patterns, from the heating element manufacturing process .
  • Fig. 9A shows a woven electro-conductive heating element core (111) in a form of a strip, folded and patterned as dictated by the heating element design. Portions of the heating element core (111) may be conditioned in various locations to augment the electrical resistance of the finished product, such conditioning is performed by at least one of the following methods: a. the use of electroconductive adhesive (122), preferably graphite based; b. the use of non-electroconductive coating material (118), preferably having adhesive properties. c. making of cut outs of various shapes and sizes (117) In order to control overheating, at least one power control device (115) is placed along the length of the heating element core.
  • the bends and folds along the length of the heating element core are attached by at least one of the following shape holding methods: a. sewing (112) with electroconductive threads, preferably carbon fiber based, or sewing with non-conductive threads; b. stapling (112'); c . gluing d. riveting e. fusing or sealing by insulating material during lamination of the heating element core.
  • the heating element core is energized through a power cord (114) which is connected to the heating element with electrodes (113), preferably having a flat shape, with large contact area.
  • the electrodes are attached to the ends of the heating element core (111), conditioned with electroconductive adhesive (122), said ends are folded over in order to have contact with both sides of the electrodes (113), then the electrode assembly is finished by sewing, stapling, riveting, or using a toothed connector.
  • the power cord has the following attachments, shown in Fig. 9A: a. electrical plug (116) b. optional power control device (115)
  • the manufacturing process utilizes the following assembly operations in any sequence: a. folding and shaping the core material into a predetermined shape; b. attachment of the electrodes and the power cord; c. laminating between the insulating material layers;
  • heat radiating layer on one side of the insulated heating element core if dictated by the heating element design; such heat radiating layer may be an aluminum foil or metallized polymer, electrically insulated from the electroconductive heating element core.
  • Figure 10A shows the heating element core (111) in a form of the strips, zigzagged by folding in order to vary the electrical resistance and wound around the parallel longitudinal electrodes (113). This enables the variation of the heating element's electrical resistance without varying the heating element core material.
  • the ends of the strips (111) are attached to the electrical busses (113) by sewing (112), stapling (112') or riveting.
  • Electrode connectors (121) and a power cord (114) are attached to the ends of the parallel bus electrodes (113).
  • the lamination of the assembly between layers of electrically insulating material follows the connection of the electrode connector (121) to the ends of the heating element core (111). In order to connect the electrodes after the lamination process, when dictated by the heating element design, the insulating layer(s) shall be either stripped at the points of connection or punctured by the electrode connector (121) .
  • Figure 10B demonstrates a variation of the heating element shown in Figure 10A.
  • the strips (111) instead of zigzagged strips (111), folded and disposed between the electrical bus electrodes (113), the strips (111) have a straight run and are wound around the parallel bus electrodes (113).
  • the contact between the strip and the busses is conditioned with a localized use of conductive adhesive, preferably carbon/graphite based, then secured by stapling (112) and/or sewing through the strip and the bus.
  • the run of the zigzag, the distance between the peaks may vary even in the same heating element, thereby varying the finished element temperature density, as may be dictated by the heating element design.
  • Figure 11 shows a heating element core (111) utilizing cut-outs (117) in order to: (a) achieve the variation of the electrical resistance (b) to provide for tight and hermetic lamination of the heating element core by fusing the insulating layers (123) through said cut outs.
  • the cut outs (117) may also be filled with conductive carbon carrying substances such as positive temperature coefficient materials (PTC) .
  • the electrical bus electrodes (113) are disposed longitudinally on the heating element core. They are made of metal wires or woven non-metallic strips with low electrical resistance or combination thereof.
  • the high electrical resistance of the fabric of the heating element core (111) can be achieved through addition of threads with high electrical resistance during the fabric weaving process, and through making cut-outs (117) in the body of the heating element core.
  • the electrodes (113) are wrapped with the woven heating element core (111) and sewn with either conductive or non-conductive threads capable of withstanding the maximum heat generated by the heating element. Staples (112) can also be used for this purpose.
  • Figures 12A and 12B show variations of the electrical busses designs and their attachments.
  • Figure 12A shows a detail of a heating element core (111), prior to lamination with insulating materials, having high conductivity threads or thin metal wires woven or sewn into its body to form the parallel electrical buss assembly (113).
  • An optional positive temperature coefficient (PTC) material (119) may be incorporated longitudinally into the heating element core (111) in selected areas. Such areas have the yarns woven in such manner that the electrical resistance across said areas is lower than the resistance of adjacent areas of the woven heating element core (111).
  • the weaving process shall, for such selected areas, use partially conductive or nonconductive yarns, such as ceramic or polymers.
  • the incorporated PTC material (119) introduces an additional self-limiting electrical conductivity to said selected areas of the heating element core (111). It is preferable to incorporate the PTC material longitudinally either in the center of the heating element core or next to the longitudinal bus electrodes (113).
  • the PTC material is made of a polymer substance having electroconductive carbon-carrying filler.
  • Figure 12B shows a detail of a heating element core (111), prior to lamination with the insulating materials, with optional cut-outs (117), attached to woven bus strip electrodes (113) with low electrical resistance. Such an attachment is made by sewing (120), stapling or riveting. It is preferable to condition the place of said connection with electroconductive adhesive comprising carbon/graphite particles prior to attachment.
  • An optional PTC material (119) may be utilized as described in Figure 12A.
  • Figure 13 shows a fragment of the heating element, prior to lamination with insulating materials, having at least three bus electrodes (113) and having the PTC material (119) longitudinally disposed between one set of bus electrodes (113), said heating element is electrically connected in parallel.
  • the preferred method consists of having no PTC material between one set of bus electrodes and having PTC material (119) longitudinally disposed between another set of bus electrodes (113).
  • All three bus electrodes (113) are connected to one power source through a power controller (115).
  • This setup enables quick gain in temperature by bypassing one bus electrode and a zone comprising the PTC material (119).
  • the electrical contact is switched to the bus electrodes so as to provide the heater, by directing the current through the PTC material (119), with self-limiting temperature capabilities .
  • a PTC material with the same or different temperature limit may be longitudinally disposed in the area indicated above as having no PTC material. This will provide for a heater with two, preferably different, temperature zones, each having the self-limiting temperature control capabilities. This method allows for a heating element with multiple temperature zones bordered by bus conductors.
  • the heating element core between the bus electrodes (113) may contain two or more separate fragments of woven electroconductive material (111) having PTC material (119) connecting said fragments longitudinally and providing electrical continuity.
  • the location of the PTC material is dictated by the heating element design.
  • the two adjacent fragments of the woven heating element core (111) are first connected by sewing (120) to electrically non-conductive connection strip (125), leaving a gap of predetermined width between them.
  • the gap is then bridged with softened PTC material (119) so as to penetrate the matrix of the woven fabric of the fragments of the heating element core (111) at the edges.
  • the sewn connection strip (125) provides desired mechanical strength; the PTC material (119) provides electrical continuity and desired self-limiting temperature control.
  • An insulating layer (123) envelops the assembly? it may also be used for connecting said adjacent fragments of the heating element core (111) instead of the connection strip (125).
  • FIG 15 shows an optional detail of the heating element core (111) attachment to a bus electrode (113).
  • the bus electrode is embedded in the PTC material (119); the shape of the PTC material envelop (119) varies with the heating element design.
  • the edge of the heating element core (111) is then wrapped around said bus electrode (113) and PTC material (119), and secured by the shape holding means such as sewing (120), stapling or riveting.
  • the connection between the PTC material and heating element core may also be heat sealed or fused.
  • the insulation layer (123) envelops the whole electroconductive assembly.
  • Figure 16 shows a fragment of the insulated heating element core (111) comprising a strand of threads or a woven rope and a preferred embodiment of its connection with a metal electrical connector (121) and a power cord (114).
  • the heating element core (111) consists of a strand or rope comprising electrically conductive carbon/graphite or carbon/graphite coated ceramic threads or combination thereof .
  • the non-electroconductive ceramic or polymer threads or combination thereof may be included in the strand or the rope of said core in order to impart additional mechanical strength and electrical resistance.
  • the electroconductive core (111) is then enclosed by the insulating sleeve (123). Due to a softness of the heating element core (111), it is preferable to make the electrical connection with the metal connector (121) by penetration of a thin part of the connector, having shape of a thin insert (124), such as a tooth, a screw or a needle, through a transverse cut of the insulated heating element core. After penetration of such thin electroconductive insert (124) into the body of the heating element core (111), the electrode connector (121) and the insulated heating element core are attached by crimping.
  • the sides of the electrode connector may also include teeth (126) which penetrate into the body of the heating element core (111) by puncturing through the insulator (123) during crimping, thus providing additional electrical connection.
  • the electrode connector (121) may be utilized to provide electrical continuity between two segments of said heating element core or to connect one segment of a power cord and a segment of said heating element core .
  • the same type of the electrical connection may be applied for the insulated strip, sleeve or pipe heating element core described in this invention.
  • FIG. 17A shows a perspective view of a sleeve/pipe shaped heating element core (111) having bus electrodes (113'), electrically connected in series according to the preferred embodiment of the present invention
  • Figure 17B describes a perspective view of a sleeve/pipe shaped heating element core (111) having longitudinal bus electrodes (113'), electrically connected in parallel.
  • Figure 17C shows a perspective view of a sleeve/pipe shaped heating element core (111), electrically connected in parallel, having bus electrodes (113') and an optional PTC material (119) incorporated longitudinally into said heating element core;
  • bus electrodes (113'), the PTC material (119) and lamination with insulating materials may be conducted as explained above for other types of heating elements.
  • the proposed soft non-metallic heating elements may be utilized in a variety of commercial and industrial heater applications, using direct or alternating current.
  • the main advantages of the heating elements are the high reliability and safety which are provided by the tightly sealed soft and durable electrically conductive yarns.
  • electrically conductive carbon/graphite fibers, non-conductive ceramic or polymer fibers in the heating element has the following additional advantages: it enables manufacturing of thin, soft and uniform heaters without utilizing conventional metal heater wires; it provides high durability of the heating appliances which can withstand sharp folding, small perforations, punctures and compression without decreasing of electrical operational capabilities; it provides high tear and wear resistance owing to: (a) high strength of the conductive yarns and (b) tight hermetically enveloping around all electrically conductive media with strong insulating materials; it provides for manufacturing of corrosion and erosion resistant heating element owing to: (a) high chemical inertness of the carbon/graphite and ceramic yarns, (b) hermetic polymer insulation of the whole heating element including connection electrodes and temperature control devices, for utilization in chemically aggressive industrial or marine environments; it offers versatility of variation of the electrical conductivity of the heating element core owing to: (a) weaving or stranding of the electrically conductive carbon/graphite yarns to the predetermined width and thickness of the
  • This feature is extremely important for construction applications (Example:-concrete) or for multi-layer insulation with different thermal expansion properties; it consists of a non-combustible electrically conductive carbon/graphite and carbon/graphite coated ceramic yarns which do not cause arcing while being cut or punctured during electrical operation; it offers high degree of flexibility and/or softness of the heating appliances depending on the type and thickness of insulation; and it provides technological simplicity of manufacturing and assembling of said heating element.
  • a combination of the electrically conductive carbon/graphite carrying woven yarns and PTC material allows to: (a) provide temperature self-limiting properties of the soft heating appliances, eliminating need for thermostats; (b) increase the distance between the bus electrodes, decreasing the risk of short circuit between said bus electrodes; (c) provide dissipation of an excess heat through the highly thermally conductive carbon/graphite fibers; (d) provide larger heat radiating area resulting in higher efficiency of the heater; (e) provide a barrier for liquid penetration to the parallel bus conductors in the event of puncturing the insulated heating element core.
  • the process of manufacturing of the insulated heating element can be fully automated, it utilizes the commercially available non toxic, nonvolatile and inexpensive products.
  • the insulated heating core can be manufactured in rolls or spools with subsequent cutting to desired sizes and further attachment of electric power cords and optional power control devices.
  • the proposed heating element can be utilized in, but not limited to: (a) electrically heated blankets, pads, mattresses, spread sheets and carpets; (b) wall, furniture, ceiling and floor electric heaters; (c) vehicle, scooter, motorcycle, boat and aircraft seat heaters; (d) electrically heated safety vests, garments, boots, gloves, hats and scuba diving suits; (e) food (Example: pizza) delivery and sleeping bags; (f) refrigerator, road, roof and aircraft/helicopter wing/blade deicing systems, (g) pipe line, drum and tank electrical heaters, (h) electrical furnace igniters, etc.
  • the same carbon/graphite carrying heating element core may be utilized for an anti static protection.
  • Figure 18A shows a garment (128) including a soft heating element according to one of the embodiments of the present invention in its construction to provide a desired degree of warmth.
  • the soft heating element (127) is sewn (120) into the garment in a predetermined location.
  • Figure 18B shows a vehicle seat (129) including a soft heating element according to one embodiment of the present invention.
  • the heating element (127) is placed under the seat upholstery.
  • Figure 18C demonstrates a floor assembly (130) utilizing one of the embodiments of the present invention.
  • the heating element (127) is placed under the floor covering.
  • An optional power control device (115) can be utilized an any proposed heating element assembly.
  • Figure 18D shows a length of pipe including a soft heating element (127) according to the present invention wrapped around the pipe to provide a desired degree of heating.
  • heating element core may include other electrically conductive materials other than carbon, such as copper, nickel or tin containing materials;
  • heating element core may include yarns made of ceramic fibers, such as alumina, silica, boria, zirconia, chromia, magnesium, calcia, silicon carbide or combination thereof;
  • heating element core may comprise electrically conductive carbon/graphite coated ceramic fibers, such as alumina, silica, boria, zirconia, chromia, magnesium, calcia, silicon carbide or combination thereof;
  • the strips can be soaked in a diluted solution of adhesives and dried, to ease the hole cutting during manufacturing of the heating element core and augmentation of its electrical properties;
  • the conductive heating element core can be electrically insulated by the soft nonconductive fabrics or polymers by sewing, gluing, fusing etc., forming a soft multi-layer assembly;
  • the conductive soft heating element core can be electrically insulated by rigid non-conductive materials like ceramics, concrete, thick plastic, wood, etc.;
  • the shape holding means can be applied on any part of the heating element core.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)

Abstract

Un élément chauffant mince, doux et flexible, constitué d'un tissu porteur de carbone électroconducteur, est imprégné d'un matériau de remplissage doux. L'élément chauffant (29) est façonné par durcissement du matériau de remplissage doux et découpage du tissu traité selon le motif souhaité. Les contacts électriques (15) sont fixés aux extrémités des bandes en serpentin, lesquelles sont connectées électriquement en parallèle ou en série. L'âme (29) de l'élément chauffant en tissu est scellée de manière à former un ensemble multicouche ayant au moins deux couches électroisolantes (12) enveloppant chaque bande de l'âme de l'élément chauffant. Ledit élément chauffant est constitué de fils non métalliques contenant des fibres contenant du carbone/graphite électroconductrice, lesquelles sont tissées ou toronnées dans les bandes, des câbles, des manchons ou des cordons de fils. Des zones sélectionnées de l'âme de l'élément chauffant sont modifiées afin de conférer des propriétés électriques supplémentaires. On incorpore dans lesdites zones sélectionnées un matériau à coefficient de température positif facultatif.
PCT/US1997/015291 1996-08-29 1997-08-29 Element chauffant et son procede de production WO1998009478A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP51198398A JP2001525104A (ja) 1996-08-29 1997-08-29 発熱体とその製造方法
EP97940706A EP0979593A4 (fr) 1996-08-29 1997-08-29 Element chauffant et son procede de production
CA002236024A CA2236024C (fr) 1996-08-29 1997-08-29 Element chauffant et son procede de production

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/705,527 1996-08-29
US08/705,527 US6057530A (en) 1996-08-29 1996-08-29 Fabric heating element and method of manufacture
US08/855,595 1997-05-13
US08/855,595 US5824996A (en) 1997-05-13 1997-05-13 Electroconductive textile heating element and method of manufacture

Publications (1)

Publication Number Publication Date
WO1998009478A1 true WO1998009478A1 (fr) 1998-03-05

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EP (1) EP0979593A4 (fr)
JP (1) JP2001525104A (fr)
CA (1) CA2236024C (fr)
IL (1) IL121654A (fr)
WO (1) WO1998009478A1 (fr)

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KR20190069530A (ko) * 2016-11-22 2019-06-19 젠썸 게엠베하 필름 히터 및 제조 방법
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GB2336514A (en) * 1998-03-19 1999-10-20 Gorix Ltd Heating pads for garments
GB2336514B (en) * 1998-03-19 2002-07-10 Gorix Ltd Heating pads for garments
WO1999060823A1 (fr) * 1998-05-15 1999-11-25 Stoeckl Roland Element chauffant electrique et son procede de fabrication
WO1999062299A1 (fr) * 1998-05-26 1999-12-02 Latec Ag Element chauffant plat et souple
EP1082879B1 (fr) * 1998-05-26 2006-02-22 Latec AG Couverture chauffante
US6452138B1 (en) 1998-09-25 2002-09-17 Thermosoft International Corporation Multi-conductor soft heating element
EP1131982A1 (fr) * 1998-09-25 2001-09-12 Arkady Kochman Element chauffant souple multiconducteur
EP1131982A4 (fr) * 1998-09-25 2002-01-30 Arkady Kochman Element chauffant souple multiconducteur
ES2155011A1 (es) * 1999-03-01 2001-04-16 Reptitropic S L Superficie calefactora para terrarios.
US6563094B2 (en) 1999-05-11 2003-05-13 Thermosoft International Corporation Soft electrical heater with continuous temperature sensing
US6713733B2 (en) 1999-05-11 2004-03-30 Thermosoft International Corporation Textile heater with continuous temperature sensing and hot spot detection
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JP2001525104A (ja) 2001-12-04
IL121654A0 (en) 1998-02-22
CA2236024A1 (fr) 1998-03-05
EP0979593A1 (fr) 2000-02-16
IL121654A (en) 2003-07-06
CA2236024C (fr) 2001-01-23
EP0979593A4 (fr) 2001-04-04

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