JP3558360B2 - Electric heating mat - Google Patents

Electric heating mat Download PDF

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Publication number
JP3558360B2
JP3558360B2 JP00213694A JP213694A JP3558360B2 JP 3558360 B2 JP3558360 B2 JP 3558360B2 JP 00213694 A JP00213694 A JP 00213694A JP 213694 A JP213694 A JP 213694A JP 3558360 B2 JP3558360 B2 JP 3558360B2
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JP
Japan
Prior art keywords
spiral groove
heating wire
electric heating
synthetic resin
heating mat
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
Application number
JP00213694A
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Japanese (ja)
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JPH07208679A (en
Inventor
隆一郎 中村
一徳 梅田
純雄 松野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Plastics Inc
Original Assignee
Mitsubishi Plastics Inc
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
Application filed by Mitsubishi Plastics Inc filed Critical Mitsubishi Plastics Inc
Priority to JP00213694A priority Critical patent/JP3558360B2/en
Publication of JPH07208679A publication Critical patent/JPH07208679A/en
Application granted granted Critical
Publication of JP3558360B2 publication Critical patent/JP3558360B2/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/26—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics for branching pipes; for joining pipes to walls; Adaptors therefor
    • F16L47/28—Joining pipes to walls or to other pipes, the axis of the joined pipe being perpendicular to the wall or to the axis of the other pipe

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

【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。
【０００２】
【従来の技術】
実開平４ー１１０２９７号公報には、合成樹脂シートの片面に設けた渦巻溝に沿って電熱線を装着し、該渦巻溝の内周端から引き出した電熱線の端部を合成樹脂シートに設けた絶縁性突起で支持して渦巻溝の外周側に導くようにした電熱マットが提案されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、この電熱マットの場合には、絶縁性突起から電熱線が外れ易く、この電熱マットを金型内にセットして溶融樹脂を射出したとき、絶縁性突起から外れた電熱線が渦巻溝からはみ出した電熱線と接触する危険性があった。
【０００４】
本発明はかかる課題を解決したものであって、分岐管継手を射出成形するときに電熱線同志が接触する虞れが全くない電熱マットを提供するものである。
【０００５】
【課題を解決するための手段】
本発明の電熱マットは、合成樹脂シートの片面に渦巻溝を設けると共に該渦巻溝に沿って電熱線を装着し、渦巻溝の内周端から引き出した電熱線の端部を該渦巻溝の上面を横切って外周側に導くにあたり、渦巻溝の間に設けた小孔に絶縁部材の脚部を嵌挿して合成樹脂シートの片面に絶縁部材を固定すると共に、該絶縁部材に設けた通孔に電熱線の端部を挿通したことを特徴とする。
【０００６】
【作用】
渦巻溝の上面を横切る電熱線は合成樹脂シートの片面に固定した絶縁部材の通孔に挿通されているので、渦巻溝から電熱線がはみ出してもこの電熱線と接触しない。
【０００７】
【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断面図、図３は本発明の電熱マットを用いて射出成形した分岐管継手の断面図であって、図中１は合成樹脂シート、２はニクロム線等の電熱線、３は分岐管継手、４は合成樹脂シート１と同種または異種の合成樹脂からなる絶縁部材である。
【０００８】
合成樹脂シート１はポリエチレン、ポリプロピレン、ポリブテン等の合成樹脂からなる肉薄シートであって、該シート１のほぼ中央部に貫通孔１１を設けると共に該貫通孔１１の周りに渦巻溝１２を設け、該渦巻溝１２に沿って電熱線２を装着する。このとき、渦巻溝１２にヒータを当てがって溶融した樹脂で渦巻溝１２を部分的に閉塞しておくと、電熱線２が渦巻溝１２からはみ出すのを防止できる。
【０００９】
そこで、渦巻溝１２の内周端から引き出した電熱線２の端部を渦巻溝１２の上面を横切って外周側に導く。このとき、渦巻溝１２、１２の間に設けた小孔１３に絶縁部材４の脚部４１を嵌挿して合成樹脂シート１の片面に絶縁部材４を固定すると共に、該絶縁部材４に設けた貫通孔４２に電熱線２を挿通する。絶縁部材４の支持高さｈは３〜８ｍｍに設定するのが好ましい
【００１０】
尚、前記渦巻溝１２のピッチＰ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、渦巻溝１２のピッチＰを０．６〜５．０ｍｍの範囲で適宜設定することができる。また、渦巻溝１２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。
【００１１】
本発明の電熱マットは上記の構成からなるので、この電熱マットを金型内にセットしてからポリエチレン、ポリプロピレン、ポリブテン等の溶融樹脂を射出すると、図３に示したように略半円弧状に湾曲したサドル３１の上面に枝管３２が一体的に突出し、またサドル３１の裏面に電熱線２が埋設された分岐管継手が得られる。
【００１２】
【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溝の上面を横切る電熱線を合成樹脂シートの片面に固定した絶縁部材の通孔に挿通して外周側に導いたので、この電熱マットを金型内にセットして分岐管継手を射出成形したとき、渦巻溝の上面を横切る電熱線が渦巻溝からはみ出した電熱線と接触することはない。
【図面の簡単な説明】
【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。
【図２】図２は電熱マットの要部を示す斜視図である。
【図３】図３は本発明の電熱マットを用いて射出成形した分岐管継手の断面図である。
【符号の説明】
１ 合成樹脂シート
２ 電熱線
３ 分岐管継手
４ 絶縁部材
１１ 貫通孔
１２ 渦巻溝
１３ 小孔
４１ 脚部
４２ 貫通孔[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating mat used 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 shape and a heating wire is buried on the back surface of the saddle.
[0002]
[Prior art]
In Japanese Utility Model Laid-Open No. 4-110297, a heating wire is attached along a spiral groove provided on one surface of a synthetic resin sheet, and an end of the heating wire drawn from an inner peripheral end of the spiral groove is provided on the synthetic resin sheet. There has been proposed an electric heating mat which is supported by insulating projections and guided to the outer peripheral side of the spiral groove.
[0003]
[Problems to be solved by the invention]
However, in the case of this electric heating mat, the heating wire is easily detached from the insulating protrusions. When the electric heating mat is set in a mold and the molten resin is injected, the heating wire detached from the insulating projections is discharged from the spiral groove. There was a risk of contact with the protruding heating wire.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an electric heating mat in which there is no possibility that electric heating wires come into contact with each other when injection molding a branch pipe joint.
[0005]
[Means for Solving the Problems]
In the electric heating mat of the present invention, a spiral groove is provided on one surface of a synthetic resin sheet, a heating wire is mounted along the spiral groove, and an end of the heating wire drawn from an inner peripheral end of the spiral groove is formed on an upper surface of the spiral groove. To guide it to the outer peripheral side, the legs of the insulating member are inserted into the small holes provided between the spiral grooves, and the insulating member is fixed to one surface of the synthetic resin sheet. The end of the heating wire is inserted.
[0006]
[Action]
Since the heating wire crossing the upper surface of the spiral groove is inserted into the through hole of the insulating member fixed to one surface of the synthetic resin sheet, even if the heating wire protrudes from the spiral groove, it does not come into contact with the heating wire.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a plan view of an electric heating mat showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a main part of the electric heating mat, and FIG. 3 is a cross-sectional view of a branch pipe joint injection-molded using the electric heating mat of the present invention. In the figure, 1 is a synthetic resin sheet, 2 is a heating wire such as a nichrome wire, 3 is a branch pipe joint, and 4 is an insulating member made of the same or different synthetic resin as the synthetic resin sheet 1.
[0008]
The synthetic resin sheet 1 is a thin sheet made of a synthetic resin such as polyethylene, polypropylene, or polybutene. The synthetic resin sheet 1 is provided with a through hole 11 at a substantially central portion of the sheet 1 and a spiral groove 12 around the through hole 11. The heating wire 2 is mounted along the spiral groove 12. At this time, if the spiral groove 12 is partially closed with resin melted by applying a heater to the spiral groove 12, the heating wire 2 can be prevented from protruding from the spiral groove 12.
[0009]
Therefore, the end of the heating wire 2 drawn from the inner peripheral end of the spiral groove 12 is guided to the outer peripheral side across the upper surface of the spiral groove 12. At this time, the leg 41 of the insulating member 4 is fitted into the small hole 13 provided between the spiral grooves 12, 12 to fix the insulating member 4 on one surface of the synthetic resin sheet 1 and provided on the insulating member 4. The heating wire 2 is inserted into the through hole 42. The supporting height h of the insulating member 4 is preferably set to 3 to 8 mm.
The pitch P of the spiral groove 12 can be appropriately set according to the diameter of the heating wire 2 or the like. For example, when the heating wire 2 having a wire diameter of 0.3 to 1.5 mm is used, the pitch P of the spiral groove 12 can be appropriately set in a range of 0.6 to 5.0 mm. Further, the width of the spiral groove 12 is preferably formed to be substantially the same as the wire diameter of the heating wire 2, and the depth thereof may be formed slightly larger than the wire diameter of the heating wire 2.
[0011]
Since the electric heating mat of the present invention has the above-described configuration, when the electric heating mat is set in a mold and then a molten resin such as polyethylene, polypropylene, or polybutene is injected, a substantially semi-arc shape as shown in FIG. 3 is obtained. A branch pipe joint is obtained in which the branch pipe 32 projects integrally on the upper surface of the curved saddle 31 and the heating wire 2 is embedded on the back surface of the saddle 31.
[0012]
【The invention's effect】
As described in detail above, in the electric heating mat of the present invention, the heating wire crossing the upper surface of the spiral groove was inserted into the through hole of the insulating member fixed to one surface of the synthetic resin sheet and led to the outer peripheral side. When the branch pipe joint is set in the mold and injection molded, the heating wire crossing the upper surface of the spiral groove does not contact the heating wire protruding from the spiral groove.
[Brief description of the drawings]
FIG. 1 is a plan view of an electric heating mat according to an 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 of a branch pipe joint injection-molded using the electric heating mat of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 synthetic resin sheet 2 heating wire 3 branch pipe joint 4 insulating member 11 through hole 12 spiral groove 13 small hole 41 leg 42 through hole

Claims (1)

略半円弧状に湾曲したサドル（３１）の上面に枝管（３２）が一体的に突出し、また前記サドル（３１）の裏面に電熱線（２）が埋設された分岐管継手（３）の成形に用いられる電熱マットであって、合成樹脂シート（１）の片面に渦巻溝（１２）を設けると共に該渦巻溝（１２）に沿って電熱線（２）を装着し、渦巻溝（１２）の内周端から引き出した電熱線（２）の端部を該渦巻溝（１２）の上面を横切って外周側に導くにあたり、渦巻溝（１２）の間に設けた小孔（１３）に絶縁部材（４）の脚部（４１）を嵌挿して合成樹脂シート（１）の片面に絶縁部材（４）を固定すると共に、該絶縁部材（４）に設けた通孔（４２）に電熱線（２）を挿通したことを特徴とする電熱マット。A branch pipe joint (3) having a branch pipe (32) integrally projecting from the upper surface of a saddle (31) curved in a substantially semi-arc shape and a heating wire (2) embedded in the back surface of the saddle (31). An electric heating mat used for molding, wherein a spiral groove (12) is provided on one surface of a synthetic resin sheet (1), and a heating wire (2) is attached along the spiral groove (12) to form a spiral groove (12). In order to guide the end of the heating wire (2) drawn out from the inner peripheral end of the spiral groove (12) to the outer peripheral side across the upper surface of the spiral groove (12), it is insulated by a small hole (13) provided between the spiral groove (12). The insulating member (4) is fixed to one surface of the synthetic resin sheet (1) by inserting the leg (41) of the member (4), and a heating wire is inserted into a through hole (42) provided in the insulating member (4). (2) An electric heating mat characterized by being inserted.
JP00213694A 1994-01-13 1994-01-13 Electric heating mat Expired - Fee Related JP3558360B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00213694A JP3558360B2 (en) 1994-01-13 1994-01-13 Electric heating mat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00213694A JP3558360B2 (en) 1994-01-13 1994-01-13 Electric heating mat

Publications (2)

Publication Number Publication Date
JPH07208679A JPH07208679A (en) 1995-08-11
JP3558360B2 true JP3558360B2 (en) 2004-08-25

Family

ID=11520927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00213694A Expired - Fee Related JP3558360B2 (en) 1994-01-13 1994-01-13 Electric heating mat

Country Status (1)

Country Link
JP (1) JP3558360B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5708251A (en) * 1995-10-30 1998-01-13 Compucraft Ltd. Method for embedding resistance heating wire in an electrofusion saddle coupler
FR3073919B1 (en) 2017-11-23 2019-12-20 Staubli Faverges MULTI-FITTING PLATE AND PLATE ASSEMBLY INCLUDING SUCH A MULTI-FITTING PLATE
JP7277961B2 (en) * 2020-12-03 2023-05-19 株式会社西村鐵工所 Disk type dryer

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