GB2390794A - Heating conductor suitable for electric blanket - Google Patents
Heating conductor suitable for electric blanket Download PDFInfo
- Publication number
- GB2390794A GB2390794A GB0215892A GB0215892A GB2390794A GB 2390794 A GB2390794 A GB 2390794A GB 0215892 A GB0215892 A GB 0215892A GB 0215892 A GB0215892 A GB 0215892A GB 2390794 A GB2390794 A GB 2390794A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heating wire
- electric heating
- blanket
- wire
- insulation layer
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 238000010438 heat treatment Methods 0.000 title abstract description 11
- 239000004020 conductor Substances 0.000 title abstract 2
- 238000005485 electric heating Methods 0.000 claims abstract description 41
- 238000009413 insulation Methods 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 15
- 239000010439 graphite Substances 0.000 claims abstract description 15
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 8
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 14
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052802 copper Inorganic materials 0.000 abstract description 9
- 239000010949 copper Substances 0.000 abstract description 9
- 239000004745 nonwoven fabric Substances 0.000 abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 3
- 230000001351 cycling effect Effects 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 229910000570 Cupronickel Inorganic materials 0.000 description 8
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- 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
- 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
- H05B2203/014—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
- H05B2203/033—Heater including particular mechanical reinforcing means
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Surface Heating Bodies (AREA)
- Resistance Heating (AREA)
Abstract
An electric heating wire 10 consists of a core 11 made from strands of graphite fibres covered by an oblate insulation layer 12 made from thermoplastic polyurethane (TPU). The insulation layer 12 has two wing flaps 13. The wing flaps 13 allow the heating wire 10 to be quickly stitched to, and anchored on, non-woven fabrics 21 (fig. 5) or blankets 31. Prior art heating cables may contain a copper/nickel conductor which can rupture as a result of fatigue caused by temperature cycling. The heating wire 10 effectively prevents this mode of failure. Electric blankets and heating pads made from the heating wire 10 have improved safety and durability.
Description
ELECTRIC HEATING WIRE AND APPLICATIONS
THEREOF
FIELD OF THE INVENTION
5 The present invention relates to an electric heating wire and its applications, and particularly an electric heating wire that does not incur fatigue due to temperature difference during heating and has a high tensile strength and pressure resistance to prevent rupture, and is applicable for electric blankets and thermal pads with desired 1() safety, durability, and ease of fabrication.
BACKGROUND OF THE INVENTION
A conventional electric heating wire as shown in FIG. 1 mainly includes a core 1 made from glass fiber, a copper nickel wire (or a 15 copper chrome wire) 2 wound around the glass fiber in helical manner, a nylon layer 3 shrouding the wound glass fiber, a thermal sensitive nickel wire 4 wound around the nylon layer 3, and finally a plastic insulation layer 5 cover to form the outmost skin. The copper nickel wire (or copper chrome wire) 2 has two ends to plug 20 to an electric power supply to generate heat and become the electric heating wire. When the copper nickel wire (or copper chrome wire) 2 receives electricity, its temperature rises. As the copper nickel wire (or copper chrome wire) 2 is made in a fine conductive wire, it extends at the high temperature, and its tensile strength decreases.
When the temperature drops, the wire returns to its original condition. The repetitive temperature variations tend to incur fatigue on the copper nickel wire (or copper chrome wire) 2 and result in rupture of the wire. This is one of the common causes of s the malfunction of the electric heating wire. The wire also is easy to break apart under a strong pulling force or when being folded and pressed. Moreover, conventional electric heating wires are made in a round shape, and are difficult to be fixed inside the electric blanket.
10 The blanket tends to form a lump when in use. The blanket embedded with round wires also generates a stiff touch which is not comfortable to people cuddled in the blanket.
SUMMARY OF THE INVENTION
15 Therefore the primary object of the invention is to provide an electric heating wire that has a core wound by an ablate insulation layer with two wing flaps for stitching to the felt in the electric blanket or thermal pad to anchor the electric heating wire quickly.
Another object of the invention is to provide an electric heating 20 wire that adopts a design to prevent fatigue caused by temperature variations when heated and rupture caused by decreasing of tensile strength and pressure resistance, thereby to achieve improved safety and durability.
Yet another object of the invention is to provide an electric
blanket that employs the heating wire which has a graphite fiber core to conduct heat and raise temperature rapidly to save electricity.
In order to achieve the objects set forth above, the electric heating wire of the invention mainly includes a core consisting of a 5 plurality of strands of graphite fibers wound by an ablate insulation layer. The insulation layer has two wing flaps for stitching to the felt in the electric blanket or thermal pad to anchor the electric heating wire. The resulting products have improved safety and durability, and can conduct heat and raise temperature rapidly to 10 save electricity.
The foregoing, as well as additional objects, features and advantages clef the invention will be more readily apparent from the following detailed description, which proceeds with reference to the
accompanying drawings.
BRIEF DESCRIPI ION OF THE DRAWINGS
FIG. 1 is a perspective view of a conventional electric heating wire. FIG 2 is a perspective view of the electric heating wire of the 20 invention FIG. 3 is a cross section according to FIG. 2.
FIG. 4 is a perspective view of another embodiment of the electric heating wire of the invention.
FIG. 5 is a pictorial view of the electric heating wire of the invention adopted on an electric blanket.
FIG. 6 is a schematic front view according to FIG. 5.
FIG. 7 is a schematic perspective view of the electric heating 5 wire of the invention adopted on a thermal pad.
FIG. 8 is a cross section taken along line S-8 in FIG. 7.
FIG. 9 is a pictorial view of a thermal pad stitched with the naked electric heating wire of the invention.
10 DESCRIPI ION OF THE PREFERRED EMBODIMENTS
Referring to FIGS. 2 and 3, the electric heating wire 10 of the invention includes a non-metal core 11 which consists of a plurality of strands of graphite fibers. The core 11 is wound axially in an even thickness by an ablate insulation layer 12 made from Is thermoplastic polyurethane (TPU). The insulation layer has two wing flaps 13 on the left and right sides for stitching use.
Referring to FIG. 4, the electric heating wire 10A of the invention may also be made in a circular bundle wound by an insulation layer 12A with two wing flaps 1 3A formed on two sides.
20 Such a construction may be used on products that do not demand a high degree of pliability.
By means of the construction set forth above, when the core wire 11 made from the graphite fibers is energized by electricity, it generates heat As the graphite fiber is formed by graphitization of
carbon in inert gas at high temperature, it has an evenly aligned crystal structure and a stable resistance. When heated or cooled, it does not incur much extension or retraction because of temperature variations. Thus it can effectively prevent fatigue and rupture. As a 5 result, it provides greater safety and durability. In addition, the core 11 made from graphite fibers conducts heat and attain a high temperature rapidly, thus it also can save electricity.
Furthermore, the core 11 in the electric heating wire 10 of the invention is formed by combining a plurality strands of graphite 0 fibers. The core 10 does not extend when the temperature of the electric heating wire rises, and does not incur fatigue when the temperature drops, and also offers desired pressure resistance and tensile strength. Thus it effectively overcomes the disadvantages of conventional electric heating wires made from copper nickel wires IS (or a copper chrome wires) 2 wound around the glass fiber 1 in a helical manner, such as incurring fatigue at difference temperatures, different density of the helical coil structure of the copper nickel wires (or a copper chrome wires) 2. and the uneven heating of the entire electric heating wire that ensues.
20 In addition, the wing flaps 13 extended from the left and right sides of the insulation layer 12 of the electric heating wire 10 can facilitate stitching operation of the electric heating wire 10 to the pliable felt of the blanket and speed up fabrication. The insulation layer 12 made from TPU is tough and has a great resistance to 25 scrape. Therefore the electric wire 10 thus made can resist
deformation and high temperature, and has great insulation and durability. Refer to FIGS. 5 and 6 for a first application of the invention adopted on an electric blanket 20. The electric blanket 20 has an s upper layer and a lower layer made from a non-woven fabric 21.
The two inner sides of the non-woven fabric 21 are bonded respectively to a layer of reinforced yarn 22 to increase the tensile strength and toughness. An electric heating wire 10 formed in S-
shape is disposed between the two layers of the reinforced yarn 22 0 One layer of the reinforced yarn 22 is stitched to the upper side of the nonwoven fabric 21. Then cover the other layer of the non-
woven fabric 21 that already has the reinforced yarn 22 stitched thereon over the electric heating wire 10 to form an integrated electric blanket 20. As the filaments of the non-woven fabric are 15 more fluffy than ordinary fabrics, the finished blanket 20 supported by the meshed reinforced yarn 22 provides a soft and comfortable touch sense.
Refer to FIGS. 7 and 8 for a second application of the electric heating wire 10 of the invention. The electric wire 10 may be 20 stitched on a woolen blanket 31 in S-shape patterns in a zigzag fashion. Such a structure can facilitate fabrication and offer a desired bonding force. Finally, the blanket 31 with the electric heating wire 10 stitched thereon is housed in a heat insulation cover 32 which is further wrapped by a water molecular thermal pad 33 to 25 form a completed heating pad 30.
Refer to FIG. 9 for a third application of the invention adopted on a thermal pad 40. It mainly includes a blanket 41 which has dividing spaces 42 formed thereon and spaced from one another at a selected interval. The blanket 41is laid with a graphite fibers s bundle consisting of a plurality of strands of graphite fibers. The graphite fibers bundle is naked without covered by the insulation layer to form a naked electric heating wire LOB, and is stitched to the blanket 41 is S-pattern in a zigzag fashion. Then the blanket 41 is housed in a cover 43 to form the integrated thermal pad 40. The 10 dividing space 42 is reserved for binding the cover 43 to the blanket 41 by high frequency welding to prevent the blanket 41 from forming bumps in the cover 43 when in use.
As the core 11 of the electric heating wire 10 is made from non-
metal graphite fibers and has a great pliability, it has great pressure 15 resistance and tensile strength. Even if the electric blanket 20 is laid on the spring mattress with users standing or kneeing thereon, the electric heating wire still can withstand the pressure without breaking. Moreover, the insulation layer 12 covered the core 11 is made from TPU which has a great toughness and is heat resistant, 20 and can give the electric heating wire 10 greater durability and safety. In addition, the ablate structure and pliability give user more comfortable feeling. As the graphite fibers conduct heat very quickly, electricity consumption is reduced. It also effectively resolves the uneven heating problem resulting from helical wiring 25 of the copper nickel wires (or a copper chrome wires) 2 occurs to
conventional electric heating wires.
Claims (4)
1. An electric heating wire, comprising: a core consisting of a plurality of strands of graphite fibers; and 5 at least one insulation layer wound around the core with the outmost layer thereof having two sides forming wing flaps for stitching to and anchoring on a blanket.
2. The electric heating wire of claim 1, wherein the insulation layer is made from thermoplastic polyurethane (TPU).
10
3. An electric heating wire adopted for use on an electric blanket, comprising: at least one electric heating wire located in the blanket in a zigzag fashion having a core consisting of a plurality of strands of non-metal graphite fibers, the core being wound by at least 15 one insulation layer with the outmost layer thereof having two sides forming wing flaps for stitching and anchoring use.
4. An electric heating wire substantially as described herein with reference to figures 2 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0215892A GB2390794A (en) | 2002-07-09 | 2002-07-09 | Heating conductor suitable for electric blanket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0215892A GB2390794A (en) | 2002-07-09 | 2002-07-09 | Heating conductor suitable for electric blanket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0215892D0 GB0215892D0 (en) | 2002-08-14 |
| GB2390794A true GB2390794A (en) | 2004-01-14 |
Family
ID=9940125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0215892A Withdrawn GB2390794A (en) | 2002-07-09 | 2002-07-09 | Heating conductor suitable for electric blanket |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2390794A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1303917A (en) * | 1971-07-07 | 1973-01-24 | ||
| GB1521460A (en) * | 1974-08-30 | 1978-08-16 | Raychem Corp | Self-limiting electrically resistive article and process for its manufacture |
| US4928344A (en) * | 1988-04-18 | 1990-05-29 | Bliss William R | Electrically heated wiper blade utilizing fibrous carbon heating element |
| US6215110B1 (en) * | 1998-02-11 | 2001-04-10 | Msx, Inc. | Formable heater tape assembly |
-
2002
- 2002-07-09 GB GB0215892A patent/GB2390794A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1303917A (en) * | 1971-07-07 | 1973-01-24 | ||
| GB1521460A (en) * | 1974-08-30 | 1978-08-16 | Raychem Corp | Self-limiting electrically resistive article and process for its manufacture |
| US4928344A (en) * | 1988-04-18 | 1990-05-29 | Bliss William R | Electrically heated wiper blade utilizing fibrous carbon heating element |
| US6215110B1 (en) * | 1998-02-11 | 2001-04-10 | Msx, Inc. | Formable heater tape assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0215892D0 (en) | 2002-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |