JPH0217436Y2 - - Google Patents
Info
- Publication number
- JPH0217436Y2 JPH0217436Y2 JP1981034828U JP3482881U JPH0217436Y2 JP H0217436 Y2 JPH0217436 Y2 JP H0217436Y2 JP 1981034828 U JP1981034828 U JP 1981034828U JP 3482881 U JP3482881 U JP 3482881U JP H0217436 Y2 JPH0217436 Y2 JP H0217436Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- composition
- insulator
- film layer
- heating element
- 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.)
- Expired
Links
- 239000000203 mixture Substances 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000012212 insulator Substances 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 239000002655 kraft paper Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920001756 Polyvinyl chloride acetate Polymers 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
- Surface Heating Bodies (AREA)
Description
本考案は、プラスチツク例えば熱可塑性エラス
トマーに導電性カーボンを混練した半導電性の発
熱用組成物に通電して発熱させるようにした面状
発熱体に関するものである。
プラスチツクに導電性カーボンを混練した発熱
用組成物は、既に知られており、例えば組成物を
帯状に形成し、この組成物中に一対の通電用電極
線を平行に埋め込むと同時に組成物の外周に絶縁
性のプラスチツクを絶縁体として被覆した構造の
ものが、従来より面状発熱体として提案されてい
る。
しかしながら、この種従来構造のものにあつて
は、長期的な安定性に乏しく、使用を続けていく
間に、発熱量が変化し、次第に初期の発熱量を得
ることができなくなるという発熱体として重大な
欠点があつた。
そこで、本考案者等が種々検討、研究した結
果、発熱用組成物と絶縁体との間に所定の熱伝達
率を有するフイルム層を設けることにより、長期
に渡つて発熱量の安定した発熱体を得ることがで
きることを見い出した。
本考案は、このような経過を経てなされたもの
である。そしてその目的とするところは、この種
発熱体において、発熱用組成物と絶縁体との間に
発泡プラスチツク、プラスチツク不織布、クラフ
ト紙の単独またはこれらの組み合わせからなりか
つ所定の熱伝達率を有する空〓含有フイルム層を
設けることにより、長期に渡つて発熱量の安定し
たものを提供するにある。
かかる本考案の特徴は、上記フイルム層を熱伝
達率５〜1000Kca／m2・hr・℃のフイルムによ
り構成した点にある。
このようなフイルム層を設けることにより、長
期に渡つて安定な発熱量を得ることができるのは
次のような理由によると、考えられる。すなわ
ち、フイルム層をなすフイルムの適度な熱伝達率
によつて、発熱用組成物からの熱の伝達が適度に
調整されるため、発熱用組成物のスムーズな発熱
が可能となつて、組成物の劣化が防止されるから
である。また、発熱体の製造時においても、上記
フイルムの適度な熱伝達率によつて、外部から加
えられる熱（絶縁体、シースなどを被覆する際に
加えられる熱など）が発熱用組成物にあまり影響
を与えないため、製品の発熱量にバラツキが少な
くなると同時に、その後の動作特性が安定するか
らである。すなわち、発熱体の製造時には、絶縁
体を低い温度で押出被覆すると、押出時の歪が残
るため、通電使用時において加温されると歪が解
放され変形を生じ、その結果発熱体の発熱量が著
るしく変化してしまう。また絶縁体を押出時の歪
が残らないよう高温で押出被覆しようとすると、
発熱用組成物が高温に曝され分解を生じ脆化、発
泡してしまう。そこで、上記熱伝達率のフイルム
を使用することにより、製造時に外部から加えら
れる熱（絶縁体シース等を被覆する際加えられる
熱など）が発熱用組成物にあまり影響を与えず、
しかも絶縁体の押出歪が残らないような高温での
押出被覆が可能となり、長期安定性の優れた製品
が製造可能となるからである。
そして、その熱伝達率の範囲を５〜1000Kca
／m2・hr・℃としたのは、5Kca／m2・hr・
℃未満であると、発熱用組成物から外部への熱伝
達が悪くなるため、組成物の温度が過度に上がつ
て、組成物の劣化が進行し、長期に渡る安定性が
なくなるからである。また逆に、1000Kca／
m2・hr・℃を越えると、製造時に発熱用組成物に
外部から与えられる熱の影響が大きくなりすぎ
て、製品の発熱量に大きなバラツキがでると同時
に、その後の動作特性も低下するからである。
このフイルム層に用いるフイルムとしては、例
えば、発泡ウレタンフイルム、ポリエステル不織
布、ナイロン不織布、クラフト紙などが使用でき
る。
次に本考案の一実施例を図面に基づいて詳説す
る。図において、１は発熱用組成物、２，２は通
電用電極線で、一対からなり、上記発熱用組成物
１の長さ方向に平行して埋め込まれている。３は
本考案の特徴とする空〓含有フイルムで、上記発
熱用組成物１の外周に設けてある。そしてこのフ
イルム層３上には絶縁体４が被覆してあり、さら
にこの上にはシース５などが被覆してある。尚、
このシース５などは省略することも可能である。
この実施例において、発熱用組成物１は熱可塑
性エラストマーとしてサーリン樹脂（商品名、デ
ユポン社製）を用い、この樹脂100部に対し、導
伝性カーボン50部を混練して半導電性とし、発熱
性を持たせてある。そして、この組成物１は発熱
面が面状となるように帯状に形成してある。この
組成物の外周に設けられるフイルム層３のフイル
ムは発泡ウレタンフイルム（比重0.14）を用い、
その厚さは0.1mmである。そして本実施例の場合、
1/2ラツプの横巻きとしてある。このフイルムは
また一層以上、何層でもよく、上記横巻きの他
に、縦添え、さらには両者の組合せ、あるいは貼
合せなどでもよい。とにかく、総合してフイルム
層全体の熱伝達率が上述した５〜1000Kca／
m2・hr・℃の範囲内に入つていればよい。このフ
イルム層３上に被覆される絶縁体としてはMI（メ
ルトインデツクス）＝１、比重0.92のポリエチレ
ンが用いられ、またシース５などとして例えば、
ポリエチレン（MI＝0.3、SG：0.92）、軟質ポリ
塩化ビニル、エチレン酢酸ビニル共重合体が用い
られている。
因に、このように構成される本考案の面状発熱
体と、フイルム層のない場合の同種面状発熱体
（従来品）とを比較すると、次表の如くであつた。
尚、この場合、導体は１mm2の軟銅線を使用した。
The present invention relates to a planar heating element that generates heat by applying electricity to a semiconductive heating composition made of plastic, such as a thermoplastic elastomer, mixed with conductive carbon. Heat-generating compositions made by kneading conductive carbon into plastic are already known. For example, the composition is formed into a band shape, and a pair of current-carrying electrode wires are embedded in the composition in parallel, and at the same time the outer periphery of the composition is Conventionally, planar heating elements have been proposed that are coated with insulating plastic as an insulator. However, this kind of conventional structure has poor long-term stability, and as the heating element continues to be used, the amount of heat generated changes and gradually becomes unable to obtain the initial amount of heat. There was a serious flaw. Therefore, as a result of various studies and studies by the present inventors, it was found that by providing a film layer having a predetermined heat transfer coefficient between the heat generating composition and the insulator, a heat generating body with stable heat generation over a long period of time was created. I found that it is possible to obtain The present invention was developed through this process. The purpose of this is to create a space between the heat generating composition and the insulator in this type of heating element, which is made of foamed plastic, plastic nonwoven fabric, or kraft paper, or a combination thereof, and has a predetermined heat transfer coefficient. By providing the containing film layer, it is possible to provide a product with a stable calorific value over a long period of time. A feature of the present invention is that the film layer is made of a film having a heat transfer coefficient of 5 to 1000 Kca/m 2 ·hr·°C. The reason why a stable calorific value can be obtained over a long period of time by providing such a film layer is considered to be as follows. In other words, due to the appropriate heat transfer coefficient of the film constituting the film layer, the transfer of heat from the heat generating composition is appropriately adjusted, so that the heat generating composition can generate heat smoothly, and the composition This is because deterioration of the material is prevented. In addition, during the production of heating elements, due to the moderate heat transfer coefficient of the above-mentioned film, heat applied from the outside (such as heat applied when covering insulators, sheaths, etc.) is not transferred to the heating composition. This is because since there is no influence, variations in the amount of heat generated by the product are reduced, and at the same time, the subsequent operating characteristics are stabilized. In other words, when manufacturing a heating element, if the insulator is extruded and coated at a low temperature, the distortion from extrusion remains, so when it is heated during energized use, the distortion is released and deformation occurs, resulting in a decrease in the heat output of the heating element. changes significantly. Also, when trying to extrude and coat an insulator at high temperatures to avoid distortion during extrusion,
The exothermic composition is exposed to high temperatures and decomposes, becoming brittle and foaming. Therefore, by using a film with the above heat transfer coefficient, heat applied from the outside during manufacturing (such as heat applied when covering an insulator sheath, etc.) will not have much effect on the heat generating composition.
Moreover, extrusion coating can be performed at high temperatures such that no extrusion strain remains in the insulator, and products with excellent long-term stability can be manufactured. Then, the range of the heat transfer coefficient is 5 to 1000Kca.
/m 2・hr・℃ is 5Kca/m 2・hr・℃
If it is below ℃, heat transfer from the exothermic composition to the outside will be poor, and the temperature of the composition will rise excessively, resulting in progressive deterioration of the composition and loss of long-term stability. . On the other hand, 1000Kca/
If it exceeds m2・hr・℃, the influence of external heat applied to the exothermic composition during manufacturing becomes too large, resulting in large variations in the calorific value of the product and at the same time deteriorating its subsequent operating characteristics. It is. Examples of the film used for this film layer include foamed urethane film, polyester nonwoven fabric, nylon nonwoven fabric, and kraft paper. Next, one embodiment of the present invention will be explained in detail based on the drawings. In the figure, 1 is a heat generating composition, and 2, 2 are a pair of current-carrying electrode wires, which are embedded in parallel to the length direction of the heat generating composition 1. Reference numeral 3 denotes a void-containing film, which is a feature of the present invention, and is provided around the outer periphery of the heat-generating composition 1. This film layer 3 is coated with an insulator 4, and a sheath 5 and the like are further coated on top of this. still,
This sheath 5 and the like can also be omitted. In this example, the heat-generating composition 1 uses Surlyn resin (trade name, manufactured by DuPont) as a thermoplastic elastomer, and 100 parts of this resin is kneaded with 50 parts of conductive carbon to make it semiconductive. It has a heat generating property. The composition 1 is formed into a band shape so that the heat generating surface is planar. The film of the film layer 3 provided on the outer periphery of this composition is a foamed urethane film (specific gravity 0.14),
Its thickness is 0.1mm. And in the case of this example,
It is available as a 1/2 wrap horizontal wrap. The film may have one or more layers, or may have multiple layers, and in addition to the above-mentioned horizontal wrapping, it may also be wrapped vertically, or a combination of both, or laminated together. Anyway, overall, the heat transfer coefficient of the entire film layer is 5~1000Kca/
It is sufficient if it is within the range of m2・hr・℃. As the insulator coated on the film layer 3, polyethylene with an MI (melt index) of 1 and a specific gravity of 0.92 is used, and as the sheath 5, for example,
Polyethylene (MI = 0.3, SG: 0.92), flexible polyvinyl chloride, and ethylene vinyl acetate copolymer are used. Incidentally, when the planar heating element of the present invention constructed in this way was compared with the same type of planar heating element (conventional product) without a film layer, the results were as shown in the following table.
In this case, a 1 mm 2 annealed copper wire was used as the conductor.
【表】
この表から、フイルム層を設けた本考案の面状
発熱体の場合、殆んど発熱量の変化がないのに対
し、フイルム層のない同種発熱体においては、１
年間程度の使用によつても発熱量が著しく低下す
ることがわかる。
以上説明したように本考案によれば、プラスチ
ツクに導電性カーボンを混練した発熱用組成物に
通電して発熱させるようにした面状発熱体におい
て、発熱用組成物と絶縁体との間に、熱伝達率が
５〜1000Kca／m2・hr・℃のフイルム層を設け
てあるため、該フイルム層の適度な熱伝達率によ
つて、長期に渡つて発熱量の安定な優れた面状発
熱体を提供することができる。[Table] From this table, it can be seen that in the case of the planar heating element of the present invention with a film layer, there is almost no change in the calorific value, whereas in the case of the same type of heating element without a film layer,
It can be seen that the calorific value decreases significantly even after use for about a year. As explained above, according to the present invention, in a planar heating element that generates heat by supplying electricity to a heating composition made of plastic mixed with conductive carbon, there is a gap between the heating composition and the insulator. Since the film layer has a heat transfer coefficient of 5 to 1000 Kca/ m2・hr・℃, the appropriate heat transfer coefficient of the film layer provides excellent planar heat generation with stable heat generation over a long period of time. You can donate your body.
図は本考案の面状発熱体の一実施例を示す端部
に斜視図である。
１……発熱用組成物、２，２……通電用電極
線、３……空〓含有フイルム、４……絶縁体。
The figure is an end perspective view showing an embodiment of the planar heating element of the present invention. DESCRIPTION OF SYMBOLS 1... Heat generating composition, 2, 2... Current-carrying electrode wire, 3... Blank-containing film, 4... Insulator.
Claims (1)
熱用組成物中に一対の通電用電極を埋め込み、か
つ前記発熱用組成物の外周に絶縁体を被覆させた
面状発熱体において、前記発熱用組成物と絶縁体
との間に、発泡プラスチツク、プラスチツク不織
布、クラフト紙の単独またはこれらの組み合わせ
からなりかつ熱伝達率が５〜1000Kca／m2・
hr・℃の空〓含有フイルム層を設けたことを特徴
とする面状発熱体。 A planar heating element in which a pair of current-carrying electrodes is embedded in a heating composition made by kneading conductive carbon into plastic, and an insulator is coated on the outer periphery of the heating composition. Between it and the insulator, a material made of foamed plastic, plastic non-woven fabric, or kraft paper, or a combination thereof, with a heat transfer coefficient of 5 to 1000 Kca/ m2 .
A planar heating element characterized by having a film layer containing air at hr/℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981034828U JPH0217436Y2 (en) | 1981-03-14 | 1981-03-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981034828U JPH0217436Y2 (en) | 1981-03-14 | 1981-03-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57148793U JPS57148793U (en) | 1982-09-18 |
| JPH0217436Y2 true JPH0217436Y2 (en) | 1990-05-15 |
Family
ID=29832117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981034828U Expired JPH0217436Y2 (en) | 1981-03-14 | 1981-03-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0217436Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4738264U (en) * | 1971-05-22 | 1972-12-27 | ||
| JPS5344335B2 (en) * | 1976-04-30 | 1978-11-28 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS554950Y2 (en) * | 1976-09-20 | 1980-02-05 | ||
| JPS5344335U (en) * | 1976-09-21 | 1978-04-15 |
-
1981
- 1981-03-14 JP JP1981034828U patent/JPH0217436Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4738264U (en) * | 1971-05-22 | 1972-12-27 | ||
| JPS5344335B2 (en) * | 1976-04-30 | 1978-11-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57148793U (en) | 1982-09-18 |
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