JP2929350B2 - Electric heating mat - Google Patents
Electric heating matInfo
- Publication number
- JP2929350B2 JP2929350B2 JP25609493A JP25609493A JP2929350B2 JP 2929350 B2 JP2929350 B2 JP 2929350B2 JP 25609493 A JP25609493 A JP 25609493A JP 25609493 A JP25609493 A JP 25609493A JP 2929350 B2 JP2929350 B2 JP 2929350B2
- Authority
- JP
- Japan
- Prior art keywords
- electric heating
- heating wire
- heating mat
- branch pipe
- spiral groove
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
- B29D23/003—Pipe joints, e.g. straight joints
- B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
- B29D23/003—Pipe joints, e.g. straight joints
- B29D23/008—T-joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、略半円弧状に湾曲した
サドルの上面に枝管が一体的に突出し、またサドルの裏
面に電熱線が埋設された分岐管継手の成形に用いられる
電熱マットに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating apparatus for forming a branch pipe joint in which a branch pipe integrally projects from an upper surface of a saddle curved in a substantially semicircular arc, and a heating wire is buried on the back surface of the saddle. Matt.
【０００２】[0002]
【従来の技術】この種の電熱マットとして、例えば実開
平１ー１２１７９４号公報には、合成樹脂シートのほぼ
中央部に貫通孔を設け、該貫通孔を中心として渦巻状に
連続した溝を設けると共に該溝に沿って電熱線を装着
し、またシートにヒータを当てがって放射状に延びる溶
融樹脂で電熱線が溝からはみ出さないようにした電熱マ
ットが提案されている。2. Description of the Related Art As an electric heating mat of this kind, for example, Japanese Utility Model Laid-Open Publication No. 1-112794, a through hole is provided substantially at the center of a synthetic resin sheet, and a spirally continuous groove is provided around the through hole. In addition, an electric heating mat has been proposed in which a heating wire is mounted along the groove and a heater is applied to the sheet to prevent the heating wire from protruding from the groove by a molten resin extending radially.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、この電
熱マットを用いてサドルの裏面に電熱線が埋設された分
岐管継手を成形する場合、金型キャビテイ内に電熱マッ
トをセットして溶融樹脂を射出したとき、渦巻状の溝内
に空気が封じ込められて電熱線の近傍に気泡が発生する
ことがあった。However, when a branch pipe joint in which a heating wire is buried on the back surface of a saddle is formed by using the heating mat, the heating resin is set in a mold cavity and molten resin is injected. In some cases, air was trapped in the spiral groove and bubbles were generated near the heating wire.
【０００４】このため、電熱線を発熱させてサドルの裏
面に合成樹脂管を融着接合したとき、電熱線が接触して
ショートしたり、電熱線に沿って存在する気泡を介して
管内流体が漏洩する危険性があった。Therefore, when a synthetic resin tube is fusion-bonded to the back surface of the saddle by causing the heating wire to generate heat, the heating wire comes into contact and short-circuits, or the fluid in the tube is released through bubbles existing along the heating wire. There was a risk of leakage.
【０００５】本発明はかかる課題を解決したものであっ
て、電熱線がショートしたり、電熱線に沿って管内流体
が漏洩する危険性がない分岐管継手を成形できる電熱マ
ットを提供するものである。The present invention has been made to solve the above problems, and provides an electric heating mat capable of forming a branch pipe joint without a risk of short-circuiting of a heating wire or leakage of a fluid in a pipe along the heating wire. is there.
【０００６】[0006]
【課題を解決するための手段】本発明の電熱マットは、
合成樹脂シートのほぼ中央部に貫通孔を設け、該貫通孔
を中心に渦巻状の溝を設けると共に該溝に沿って電熱線
を装着し、また前記渦巻状の溝を横切ってほぼ放射状に
延びる複数本の空気抜き溝を設けたことを特徴とする。The electric heating mat of the present invention comprises:
A through hole is provided substantially at the center of the synthetic resin sheet, a spiral groove is provided around the through hole, and a heating wire is mounted along the groove, and extends substantially radially across the spiral groove. A plurality of air vent grooves are provided.
【０００７】[0007]
【作用】渦巻状の溝を横切ってほぼ放射状に延びる複数
本の空気抜き溝を設けたので、この電熱マットを金型キ
ャビテイ内にセットして溶融樹脂を射出したとき、空気
抜き溝を介して空気がスムースに排出されるため、電熱
線に沿って気泡が発生しない。[Function] Since a plurality of air vent grooves extending almost radially across the spiral groove are provided, when this electric heating mat is set in a mold cavity and molten resin is injected, air is released through the air vent grooves. Since the air is smoothly discharged, no bubbles are generated along the heating wire.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面にて詳細に説明
する。図１は本発明の一実施例を示す電熱マットの平面
図、図２は電熱マットの要部を示す斜視図、図３は電熱
マットを金型内にセットした状態を示す断面図、図４は
射出成形によって得られた分岐管継手の断面図であっ
て、図中１は分岐管継手、２はニクロム線、銅ニッケル
線等の電熱線、３は電熱マットである。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of an electric heating mat showing one embodiment of the present invention, FIG. 2 is a perspective view showing a main part of the electric heating mat, FIG. 3 is a sectional view showing a state where the electric heating mat is set in a mold, and FIG. Is a cross-sectional view of a branch pipe joint obtained by injection molding, wherein 1 is a branch pipe joint, 2 is a heating wire such as a nichrome wire, a copper nickel wire or the like, and 3 is an electric heating mat.
【０００９】電熱マット３はポリエチレン、ポリプロピ
レン、ポリブテン等の肉薄の合成樹脂シート３１からな
るものであって、該シート３１のほぼ中央部には貫通孔
３２を設けられている。尚、図１には円形状に形成した
合成樹脂シート３１を例示したが、該シート３１は成形
する分岐管継手１のサドル１１の形状等に応じて楕円形
状あるいは方形状とすることができる。この合成樹脂シ
ート３１の片面に前記貫通孔３２を中心として渦巻状の
溝３３を設け、該溝３３に沿って電熱線２を装着すると
共に、該電熱線２の両端部に端子ピン２１を装着する。The electric heating mat 3 is made of a thin synthetic resin sheet 31 made of polyethylene, polypropylene, polybutene or the like, and a through hole 32 is provided at a substantially central portion of the sheet 31. Although the synthetic resin sheet 31 formed in a circular shape is illustrated in FIG. 1, the sheet 31 may be formed into an elliptical shape or a square shape according to the shape of the saddle 11 of the branch pipe joint 1 to be formed. A spiral groove 33 is provided on one side of the synthetic resin sheet 31 around the through hole 32, the heating wire 2 is mounted along the groove 33, and the terminal pins 21 are mounted on both ends of the heating wire 2. I do.
【００１０】前記渦巻状の溝３３のピッチは電熱線２の
線径等に応じて適宜設定することができる。例えば、線
径が０．３〜１．５ｍｍの電熱線２を使用する場合に
は、溝３３のピッチを０．６〜５．０ｍｍの範囲で適宜
設定することができる。また、渦巻状の溝３３の幅は電
熱線２の線径とほぼ同一に形成し、その深さを電熱線２
の線径より若干大き目に形成するとよい。The pitch of the spiral groove 33 can be appropriately set according to the diameter of the heating wire 2 and the like. For example, when using the heating wire 2 having a wire diameter of 0.3 to 1.5 mm, the pitch of the grooves 33 can be appropriately set in a range of 0.6 to 5.0 mm. The width of the spiral groove 33 is formed to be substantially the same as the diameter of the heating wire 2, and the depth thereof is set to
It is good to form it slightly larger than the wire diameter.
【００１１】また、渦巻状の溝３３を横切ってほぼ放射
状にヒータを当てがい、この溶融した複数本の樹脂３５
で渦巻状の溝３３を部分的に閉塞して該溝３３から電熱
線２がはみ出さないようにする。更に、渦巻状の溝３３
を横切ってほぼ放射状に延びる複数本の空気抜き溝３４
を設ける。空気抜き溝３４は渦巻状の溝３３より若干深
くなるように形成するのが好ましく、該溝３４の内方端
を貫通孔３２に開口させると共に、その外方端をシート
３１の外周縁に開口させるとよい。A heater is applied almost radially across the spiral groove 33, and the molten resin 35
To partially close the spiral groove 33 so that the heating wire 2 does not protrude from the groove 33. Furthermore, the spiral groove 33
Air vent grooves 34 extending substantially radially across the
Is provided. The air vent groove 34 is preferably formed so as to be slightly deeper than the spiral groove 33. The inner end of the groove 34 is opened to the through hole 32, and the outer end is opened to the outer peripheral edge of the sheet 31. Good.
【００１２】本発明の電熱マット３は上記の構成からな
るので、この電熱マット３を用いてサドルの裏面に電熱
線が埋設された分岐管継手を成形する場合、図３に示し
た如く電熱マット３を金型内にセットする。即ち、渦巻
状の溝３３が形成された片面を上にして電熱マット３を
下型４上に載置し、上型５と中子６とを型閉めする。そ
こで、金型キャビテイ内にポリエチレン、ポリプロピレ
ン、ポリブテン等の溶融樹脂を射出する。Since the electric heating mat 3 of the present invention has the above-described structure, when forming a branch pipe joint in which a heating wire is buried on the back surface of a saddle using the electric heating mat 3, as shown in FIG. 3 is set in the mold. That is, the electric heating mat 3 is placed on the lower mold 4 with one side having the spiral groove 33 formed thereon, and the upper mold 5 and the core 6 are closed. Therefore, a molten resin such as polyethylene, polypropylene, or polybutene is injected into the mold cavity.
【００１３】すると、金型キャビテイ内に溶融樹脂が充
満し、電熱マット３と溶融樹脂とが一体的に融着接合す
る。この射出成形の際に、渦巻状の溝３３内に介在して
いる空気は空気抜き溝３４を介してスムースに排出され
るため、電熱線２に沿って気泡が発生することがない。
そこで、溶融樹脂が固化するのを待って型開きすると、
図４に示した如く略半円弧状に湾曲したサドル１１の上
面に枝管１２が一体的に突出し、またサドル１１の裏面
に電熱線２が埋設された分岐管継手１が得られる。Then, the molten resin fills the mold cavity, and the electric heating mat 3 and the molten resin are integrally fused and joined. During the injection molding, the air interposed in the spiral groove 33 is smoothly discharged through the air vent groove 34, so that no bubbles are generated along the heating wire 2.
Therefore, when the mold opens after waiting for the molten resin to solidify,
As shown in FIG. 4, a branch pipe joint 1 is obtained in which a branch pipe 12 integrally projects from an upper surface of a saddle 11 curved in a substantially semicircular arc shape, and a heating wire 2 is embedded on the back surface of the saddle 11.
【００１４】[0014]
【発明の効果】以上詳述した如く、本発明の電熱マット
は渦巻状の溝を横切ってほぼ放射状に延びる複数本の空
気抜き溝を設けたので、この電熱マットを金型キャビテ
イ内にセットして溶融樹脂を射出したとき、空気抜き溝
を介して空気がスムースに排出されるのため電熱線に沿
って気泡が発生することがない。従って、本発明の電熱
マットを用いると、電熱線がショートしたり、電熱線に
沿って管内流体が漏洩する危険性がない分岐管継手を製
造することができる。As described in detail above, the electric heating mat of the present invention is provided with a plurality of air vent grooves extending substantially radially across the spiral groove. When the molten resin is injected, air is smoothly discharged through the air vent groove, so that no air bubbles are generated along the heating wire. Therefore, the use of the electric heating mat of the present invention makes it possible to manufacture a branch pipe joint that has no risk of short-circuiting of the heating wire or leakage of the fluid in the pipe along the heating wire.
【図１】図１は本発明の一実施例を示す電熱マットの平
面図である。FIG. 1 is a plan view of an electric heating mat according to an embodiment of the present invention.
【図２】図２は電熱マットの要部を示す斜視図である。FIG. 2 is a perspective view showing a main part of the electric heating mat.
【図３】図３は電熱マットを金型内にセットした状態を
示す断面図である。FIG. 3 is a cross-sectional view showing a state where an electric heating mat is set in a mold.
【図４】図４は本発明の電熱マットを用いて成形した分
岐管継手の断面図である。FIG. 4 is a sectional view of a branch pipe joint formed using the electric heating mat of the present invention.
１ 分岐管継手 ２ 電熱線 ３ 電熱マット ３１ 合成樹脂シート ３２ 貫通孔 ３３ 渦巻状の溝 ３４ 空気抜き溝 DESCRIPTION OF SYMBOLS 1 Branch pipe joint 2 Heating wire 3 Heating mat 31 Synthetic resin sheet 32 Through hole 33 Spiral groove 34 Air release groove
Claims (1)
上面に枝管（１２）が一体的に突出し、また前記サドル
（１１）の裏面に電熱線（２）が埋設された分岐管継手
（１）の成形に用いられる電熱マット（３）であって、
合成樹脂シート（３１）のほぼ中央部に貫通孔（３２）
を設け、該貫通孔（３２）を中心に渦巻状の溝（３３）
を設けると共に該溝（３３）に沿って電熱線（２）を装
着し、また前記渦巻状の溝（３３）を横切ってほぼ放射
状に延びる複数本の空気抜き溝（３４）を設けたことを
特徴とする電熱マット。1. A branch pipe having a branch pipe (12) integrally projecting from an upper surface of a saddle (11) curved in a substantially semicircular shape, and a heating wire (2) buried on a back surface of the saddle (11). An electric heating mat (3) used for forming a joint (1),
A through hole (32) is formed in the approximate center of the synthetic resin sheet (31).
And a spiral groove (33) around the through hole (32).
And a heating wire (2) is mounted along the groove (33), and a plurality of air vent grooves (34) extending substantially radially across the spiral groove (33) are provided. And electric heating mat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25609493A JP2929350B2 (en) | 1993-10-13 | 1993-10-13 | Electric heating mat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25609493A JP2929350B2 (en) | 1993-10-13 | 1993-10-13 | Electric heating mat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07110094A JPH07110094A (en) | 1995-04-25 |
| JP2929350B2 true JP2929350B2 (en) | 1999-08-03 |
Family
ID=17287815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25609493A Expired - Fee Related JP2929350B2 (en) | 1993-10-13 | 1993-10-13 | Electric heating mat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2929350B2 (en) |
-
1993
- 1993-10-13 JP JP25609493A patent/JP2929350B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07110094A (en) | 1995-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |