【発明の詳細な説明】
本発明は内部に金属板をインサートし、外面に硬質合
成樹脂層を被覆した竪樋を製造する方法に関し、平板状
の金属板１を第１クロスヘッドダイ５に通して金属板１
の全面を軟質合成樹脂層２で被覆し、次に金属板１に軟
質合成樹脂層２を被覆したものを成型装置９にて断面Ｃ
字状に面皮して軟質合成樹脂層２の両端を溶着装置１０
にて溶着することにより内筒３を形成し、次にこの内筒
３を第２クロスヘッドダイ１２に通して内筒３の外周に
硬質合成樹脂層４を形成することを特徴とする竪樋の製
造方法に係るものであつて、本発明の目的とするとこと
は内部に金属板を内包し且つ外面を硬質合成樹脂層で被
覆した竪樋を連続的に製造できる竪樋の製造方法を提供
するにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a down pipe in which a metal plate is inserted inside and a hard synthetic resin layer is coated on the outer surface. metal plate 1
The entire surface of the metal plate 1 is coated with a soft synthetic resin layer 2, and then the metal plate 1 coated with the soft synthetic resin layer 2 is molded into a cross section C using a molding device 9.
A welding device 10 is used to weld both ends of the soft synthetic resin layer 2 in a character shape.
A vertical gutter characterized in that an inner cylinder 3 is formed by welding at a step, and then this inner cylinder 3 is passed through a second crosshead die 12 to form a hard synthetic resin layer 4 on the outer periphery of the inner cylinder 3. It is an object of the present invention to provide a method for manufacturing a vertical gutter, which can continuously manufacture a vertical gutter that includes a metal plate inside and coats the outer surface with a hard synthetic resin layer. There is something to do.
本発明を以下実施例により詳述する。本発明の竪樋は
断面ｃ字状の金属板１の全面を軟質合成樹脂層２で被覆
すると共に軟質合成樹脂層２の両端 部を溶着し内筒３
を形成し、この内筒３の外周に硬質合成樹脂層４を一体
に形成したものである。上記のような竪樋は下記のよう
にして製造するも のである。すなわち平板状の金属板
１を第１クロ スヘッドダイ５に連続して通す。この第
１クロスヘッドダイ５には第１押出機６によつて軟質合
成樹脂が連続して供給されて金属板１の全面に軟質合成
樹脂層２が連続して被覆される。この場合軟質合成樹脂
層２は金属板１の両端より更に外側方に延出していて、
この一方の延出部は下面側に段部のある第１段部７とな
り、他方の延出部は下面側に段部のある第２段部８とな
つている。次にこの金属板１に軟質合成樹脂層２を被覆
したものを適宜成型装置９によつて断面Ｃ字状に連続し
て面皮し、その後軟質合成樹脂層２の両端の第１段部
７と第２段部８とを重複して溶着装置１０によつて溶着
一体化し、内筒３を形成する。その後この内筒３を第２
クロスヘッドダイ１２に連続して通す。第２クロスヘッ
ドダイ１２には第２押出機１Ｊ３によつて硬質合成樹脂
が連続して供給されて内筒３の外面に硬質合成樹脂層４
を連続して被覆し、竪樋を製造するのである。このよう
にして竪樋が連続的に製造されるが、このように製造し
た竪樋には次の利点がある。竪樋は内部に金属板１ゝが
埋設してあるので強度が強いものであり、しかも断面Ｃ
字状の金属板の全面に軟質合成樹脂暦日被覆すると共に
軟質合成樹脂層の余端部を溶着して内筒を形成してある
ので接合部をはぜ加工で接合するものに比べて接合部分
からの水漏れがなく、はぜ加工のように接合部分が厚く
ならず、接合部分に金属板が存在しないので、竪樋を挟
みなどによつて切断する際に容易に切断できる。また内
筒の外周に硬質合成樹脂層を形成してあるのて、硬質合
成樹脂層と金属板は外気温による伸縮率が異なるが、硬
質合成樹脂層と金属板との間に存在する軟質合成樹脂層
がすベリ部分となつて内部応力を吸収し、この結果竪樋
が外気温の変化によつて割れたりしない。本発明は上述
の如く平板状の金属板を第１クロスヘッドダイに通して
金属板の全面を軟質合成樹脂層で被覆し、次に金属板に
軟質合成樹脂層を被覆したものを成型装置にて断面Ｃ字
状に曲成して軟質合成樹脂層の両端を溶着装置にて溶着
することにより内筒を形成し、次にこの内筒を第２クロ
スヘッドダイに通して内筒の外周に硬質合成樹脂層を形
成するので、第１クロスヘッドダイ、成型装置、溶着装
置、第２クロスヘッドダイの順に連続的に送ることによ
り、内部に金属板が内包され且つ外面が硬質合成樹脂層
で被覆された竪樋を連続的に製造できるものであつて、
極めて生産性良く製造できるという利点がある。The present invention will be explained in detail below with reference to Examples. The downpipe of the present invention has a metal plate 1 having a C-shaped cross section, whose entire surface is covered with a soft synthetic resin layer 2, and both ends of the soft synthetic resin layer 2 are welded to form an inner tube 3.
A hard synthetic resin layer 4 is integrally formed on the outer periphery of the inner cylinder 3. The vertical gutter described above is manufactured as follows. That is, the flat metal plate 1 is continuously passed through the first crosshead die 5. A soft synthetic resin is continuously supplied to the first crosshead die 5 by a first extruder 6, and the entire surface of the metal plate 1 is continuously coated with the soft synthetic resin layer 2. In this case, the soft synthetic resin layer 2 extends further outward from both ends of the metal plate 1,
One of the extending portions is a first stepped portion 7 with a stepped portion on the lower surface side, and the other extending portion is a second stepped portion 8 with a stepped portion on the lower surface side. Next, the metal plate 1 coated with the soft synthetic resin layer 2 is continuously molded into a C-shaped cross section using a molding device 9, and then the first step portions at both ends of the soft synthetic resin layer 2 are formed.
7 and the second step 8 are overlapped and welded together by a welding device 10 to form the inner cylinder 3. After that, this inner cylinder 3 is
Continuously pass through the crosshead die 12. A hard synthetic resin is continuously supplied to the second crosshead die 12 by a second extruder 1J3, and a hard synthetic resin layer 4 is formed on the outer surface of the inner cylinder 3.
It is then coated continuously to produce a downpipe. In this way, the downpipe is manufactured continuously, and the downpipe manufactured in this way has the following advantages. The downpipe has a metal plate buried inside it, making it strong and has a cross section of C.
The entire surface of the letter-shaped metal plate is coated with soft synthetic resin, and the remaining end of the soft synthetic resin layer is welded to form the inner cylinder, making the joint easier to join than when joining by seaming. There is no water leakage from the parts, the joint part does not become thick like in the case of seam processing, and there is no metal plate in the joint part, so it can be easily cut when cutting the downpipe with a pincher or the like. In addition, since a hard synthetic resin layer is formed on the outer periphery of the inner cylinder, the hard synthetic resin layer and the metal plate have different expansion and contraction rates depending on the outside temperature, but the soft synthetic resin layer that exists between the hard synthetic resin layer and the metal plate The resin layer becomes a tight part and absorbs internal stress, so that the downpipe does not crack due to changes in outside temperature. In the present invention, as described above, a flat metal plate is passed through a first crosshead die to cover the entire surface of the metal plate with a soft synthetic resin layer, and then the metal plate coated with the soft synthetic resin layer is transferred to a molding device. The soft synthetic resin layer is bent into a C-shaped cross section, and both ends of the soft synthetic resin layer are welded using a welding device to form an inner cylinder, and then this inner cylinder is passed through a second crosshead die to form an inner cylinder around the outer periphery of the inner cylinder. Since a hard synthetic resin layer is formed, the metal plate is encapsulated inside and the outer surface is made of a hard synthetic resin layer by successively feeding the first crosshead die, the molding device, the welding device, and the second crosshead die in this order. capable of producing coated downpipes continuously,
It has the advantage of being able to be manufactured with extremely high productivity.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は本発明の一実施例の一部切欠斜視図、第２図は
同上の製造方法の概略説明図、第３図は第２図のＡ−Ａ
線断面図、第４図は第２図のＢ−Ｂ線断面図、第５図は
第２図のＣ−Ｃ線断面図、第６図は第２図のＤ−Ｄ線断
面図てあつて、１は金属板、２は軟質合成樹脂層、３は
内筒、４は硬質合成樹脂層、５は第１クロスヘッドダイ
、９は成型装置、１０は溶着装置、１２は第２クロスヘ
ッドダイである。Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, Fig. 2 is a schematic explanatory diagram of the same manufacturing method, and Fig. 3 is A-A in Fig. 2.
4 is a sectional view taken along line B-B in FIG. 2, FIG. 5 is a sectional view taken along line C-C in FIG. 2, and FIG. 6 is a sectional view taken along line D-D in FIG. 2. 1 is a metal plate, 2 is a soft synthetic resin layer, 3 is an inner cylinder, 4 is a hard synthetic resin layer, 5 is a first crosshead die, 9 is a molding device, 10 is a welding device, and 12 is a second crosshead. It's Dai.