JP4328841B2

JP4328841B2 - Flexible synthetic resin porous tube and manufacturing method thereof

Info

Publication number: JP4328841B2
Application number: JP10502499A
Authority: JP
Inventors: 邦彦立川
Original assignee: 邦彦立川; 立川節子
Priority date: 1999-04-13
Filing date: 1999-04-13
Publication date: 2009-09-09
Anticipated expiration: 2019-04-13
Also published as: JP2000291847A

Description

【０００１】
【発明の属する技術分野】
本発明は、周面の一部あるいは周面全体が格子状の網目に形成されたフレキシブル合成樹脂一重及び二重多孔管並びにその製造方法に関するものである。
【０００２】
合成樹脂多孔管は、図７に示すように周面にその長手方向に沿う部分あるいは周面全体が格子状の網目に形成されており、図示の周面の一部を網目としたものは、地中に埋設した側溝の配水管、雨水浸透管などに、また周面全体が網目のものは井戸の吸水管先端に付設するストレーナーとして好適のものである。
【０００３】
これら合成樹脂多孔管は、従来は、金型を用いる射出成形により、所定長さの管として得られるのみで、通常の合成樹脂管と異なり、押出し成形による一連の管として製造することは不可能とされていた。
【０００４】
そこで本発明者は、特開平２−５２７２９号公報（特許第２５５６３５９号）において、押出し成形により、周面の少なくとも一部を格子状の網目に形成した合成樹脂多孔管を製造する方法を提案した。この方法は、押出し成形により、管体内周面に長手方向に沿って隆条を列設した製品を連続して製造するとともに、この製品に上記隆条を残して管を横切る切目を一定間隔で設け、かつ製品を押出し方向に牽引してこれら切目間に当たる隆条を引き延ばし格子状の網目を形成することを特徴とするものである。これにより、合成樹脂多孔管を、連続的に、極めて能率的に、しかも安価で提供することが可能となった。図８にこの方法により得られる合成樹脂多孔管を示す。
【０００５】
しかし、上記のように管体に長手方向に沿って隆条を列設した構造の合成樹脂多孔管は、その構造上、屈曲させて使用することは不可能であり、曲がり部分への使用の際には、別加工のソケット等を併用しなければならなかった。このように別の部品を必要とすることは、コスト的にも不利である上、施工にも手間取ることになる。
また、曲がり部分への対応のため、蛇腹状パイプに穴空けを施したようなもののあるが、この場合、開口数に限度があり、本来の多孔管と比較すると開口面積が大きくとれず吸排水効率は決してよくなかった。
さらに、目詰まり防止のためには、合成樹脂多孔管の二重構造化が好ましいが、従来の製造方法では金型の構造上、二重構造化は困難であり、しかもその方法で作られた製品を屈曲させて使用することは当然不可能であった。
【０００６】
【発明が解決しようとする課題】
本発明は、このような従来技術の問題点を一挙に解決し、吸排水効率にすぐれるとともに、曲がり部分への適用の際に別の部品を必要とせず、対応が容易でしかも安価に製造することができる合成樹脂多孔管及びその製造方法を提供することをその課題とする。
また、本発明は、特に目詰まりが効率的に防止され、かつ曲がり部分への適用の際に別の部品を必要とせず、対応が容易でしかも安価に製造することができる合成樹脂二重多孔管及びその製造方法を提供することを別の課題とする。
【０００７】
【課題を解決するための手段】
本発明者は、上記課題を解決すべく、鋭意研究を重ねた結果、本発明を完成するに至った。
即ち、本発明によれば、管体内周面に長手方向に沿って隆条が列設されるとともに、該隆条を残して管を横切る螺旋状の切目及び切込みが一定ピッチで管体外周面側の少なくとも一部に刻設され、かつ管体内周面側において該隆条に、該螺旋状の隣合う切目同士の中間位置を結ぶ螺旋に沿った位置にそれぞれ切込みが刻設され、管体残存部と該隆条とにより格子状の網目が形成されるとともに、上記各切込みにより可撓性が付与されていることを特徴とするフレキシブル合成樹脂多孔管が提供される。
また、本発明によれば、管体外周面に長手方向に沿って隆条が列設されるとともに、該隆条を残して管を横切る螺旋状の切目及び切込みが一定ピッチで管体内周面側の少なくとも一部に刻設され、かつ管体外周面側において該隆条に、該螺旋状の隣合う切目同士の中間位置を結ぶ螺旋に沿った位置にそれぞれ切込みが刻設され、管体残存部と該隆条とにより格子状の網目が形成されるとともに、上記各切込みにより可撓性が付与されていることを特徴とするフレキシブル合成樹脂多孔管が提供される。
また、本発明によれば、内管と外管とこれらを連結する長手方向に延びる複数の放射状の連結部とからなる管体において、該内管を残して外管を横切る螺旋状の切目が一定ピッチで管体外周面側の少なくとも一部に刻設されるとともに、該外管を残して内管を横切る螺旋状の切目が上記一定ピッチと同ピッチでかつ上記一定ピッチより半ピッチだけずれるように管体内管側の少なくとも一部に刻設され、外管残存部と該連結部並びに内管残存部と該連結部によりそれぞれ外管側及び内管側に格子状の網目が形成されていることを特徴とするフレキシブル合成樹脂二重多孔管が提供される。
また、本発明によれば、押出し成形により、管体内周面に長手方向に沿って隆条を列設した製品を連続的に製造するとともに、押出し用金型の先端近傍で管外側に設けられた第１の切断刃を回転させてその刃先で該隆条を残して管を横切る螺旋状の切目及び切込みを一定ピッチで管体外周面側の少なくとも一部に刻設すると同時に、押出し用金型の先端近傍で管内側に設けられた第２の切断刃を回転させてその刃先で管体内周面側において該隆条に該螺旋状の隣合う切目同士の中間位置を結ぶ螺旋に沿った位置にそれぞれ切込みを刻設し、さらに製品を押出し方向に牽引して引き延ばし、管体残存と該隆条とにより格子状の網目を形成することを特徴とするフレキシブル合成樹脂多孔管の製造方法が提供される。
また、本発明によれば、押出し成形により、管体外周面に長手方向に沿って隆条を列設した製品を連続的に製造するとともに、押出し用金型の先端近傍で管内側に設けられた第１の切断刃を回転させてその刃先で該隆条を残して管を横切る螺旋状の切目及び切込み一定ピッチで管体外周面側の少なくとも一部に刻設すると同時に、押出し用金型の先端近傍で管外側に設けられた第２の切断刃を回転させてその刃先で管体外周面側において該隆条に該螺旋状の隣合う切目同士の中間位置を結ぶ螺旋に沿った位置にそれぞれ切込みを刻設し、製品を押出し方向に牽引して引き延ばし、管体残存部と該隆条とにより格子状の網目を形成することを特徴とするフレキシブル合成樹脂多孔管の製造方法が提供される。
さらに、本発明によれば、押出し成形により、内管と外管とこれらを連結する長手方向に延びる複数の放射状の連結部とからなる管体製品を連続的に製造するとともに、押出し用金型の先端近傍で管外側に設けられた第１の切断刃を回転させてその刃先で該内管を残して該外管を横切る螺旋状の切目を一定ピッチで管体外周面側の少なくとも一部に刻設すると同時に、押出し用金型の先端近傍で管内側に設けられた第２の切断刃を回転させてその刃先で該外管を残して該内管を横切る螺旋状の切目を上記一定ピッチと同ピッチでかつ上記一定ピッチより半ピッチだけずれるように管体内管側の少なくとも一部に刻設し、製品を押出し方向に牽引して引き延ばし、外管残存部と該連結部並びに内管残存部と該連結部によりそれぞれ外管側及び内管側に格子状の網目を形成することを特徴とするフレキシブル合成樹脂二重多孔管の製造方法が提供される。
【０００８】
【発明の実施の形態】
以下本発明による好ましい実施の形態を実施例により詳述する。
図１に本発明によるフレキシブル合成樹脂多孔管（以下単に合成樹脂多孔管ともいう）の構成例を示す。図中１は本発明に係る合成樹脂多孔管であり、その管体２の内周面側に長手方向に沿って複数の隆条３が列設され、さらにその管体外側には一定ピッチで所定幅の螺旋状の切目４が隆条３を残す形で、しかも隆条３に一部切込み５が入る形で形成される。一方、管体内周面側には列設された隆条３に一定ピッチの螺旋に沿った切込み６が間欠的に形成される。切目４ないし切込み５の螺旋のピッチと切込み６の螺旋のピッチは図２に示すように、半ピッチだけずれるようにすることが望ましい。以上のようにして、隆条３、３間の管体にはその長手方向に一定間隔で透孔７が形成され、全体として格子状の網目を有する多孔管となり、管体の切目４以外の残存部と各隆条３はその交差部位で結合し所要の機械的強度が得られるようになっている。さらに、隆条３に設けられた切込み５、６により合成樹脂多孔管に適度な可撓性が付与され、曲がり部への施工に容易に適用可能となる。
上記構成例において隆条３の数は管の大きさ、用途等に応じて任意の数に設定することができる。また隆条３の大きさ、管体２の厚さ、切目４の幅、切込み５、６の深さ並びに各螺旋のピッチも管の大きさ、用途等に応じて任意に設定することができる。また、これらの寸法を変えることにより、網目の大きさ、密度等が任意に調整可能である。
本構成例のフレキシブル合成樹脂多孔管には、ポリエチレン、塩化ビニル、ＡＢＳ樹脂、アクリル樹脂、酢酸ビニル等の合成樹脂材料が好ましく使用される。上記の例では、合成樹脂多孔管の全面に格子状網目を形成したが、本発明によれば、一部に格子状網目を形成することもできる。
【０００９】
次に本発明によるフレキシブル合成樹脂多孔管の別の例について述べる。上記構成例では、管体の内周面に長手方向に沿って複数の隆条が列設されていたが、本構成例では、管体の外周面に長手方向に沿って複数の隆条が列設される。図３に本構成例に係る図２と同様な図を示す。図３において１１が合成樹脂多孔管、１２が管体、１３が隆条である。さらにその管体１２には、内周面側から、一定ピッチで所定幅の螺旋状の切目１４が隆条１３を残す形で、しかも隆条１３に一部切込み５が入る形で形成される。一方、管体外周側においては列設された隆条１３に一定ピッチの螺旋に沿った切込み１６が間欠的に形成される。切目１４ないし切込み１５の螺旋のピッチと切込み１６の螺旋のピッチは図３に示すように、半ピッチだけずれるようにすることが望ましい。以上のようにして、隆条１３、１３間の管体にはその長手方向に一定間隔で透孔が形成され、全体として格子状の網目を有する多孔管となり、管体の切目１４以外の残存部と各隆条１３はその交差部位で結合し所要の機械的強度が得られるようになっている。さらに、隆条１３に設けられた切込み１５、１６により合成樹脂多孔管に適度な可撓性が付与され、曲がり部への施工に容易に適用可能となる。
本構成例においても、隆条１３の数は管の大きさ、用途等に応じて任意の数に設定することができる。また隆条１３の大きさ、管体１２の厚さ、切目１４の幅、切込み１５、１６の深さ並びに各螺旋のピッチも管の大きさ、用途等に応じて任意に設定することができる。また、これらの寸法を変えることにより、網目の大きさ、密度等が任意に調整可能である。
本構成例のフレキシブル合成樹脂多孔管には、上記構成例に使用される合成樹脂材料と同様な材料を使用することができる。
また、上記の例では、合成樹脂多孔管の全面に格子状網目を形成したが、本発明によれば、一部に格子状網目を形成することもできる。
【００１０】
次に本発明によるフレキシブル合成樹脂二重多孔管の例について述べる。上記２つの構成例は一重多孔管に係るものであったが、本構成例は二重多孔管に係るものである。
本構成例において網目を形成する前の管体２２は、図４に示すように、内管２３と外管２４とこれらを連結する長手方向に延びる複数の放射状の連結部２５とから構成される。本構成例では、図５に示すように、この管体２２において、まず内管２３を残して外管２４を横切る螺旋状の切目２６が一定ピッチで管体外周面側の少なくとも一部に刻設される。また、外管２４を残して内管２３を横切る螺旋状の切目２７が上記一定ピッチと同ピッチでかつ上記一定ピッチより半ピッチだけずれるように、管体内管側の少なくとも一部に刻設される。そして外管残存部と連結部２５により外管側において、また内管残存部と連結部２５により内管側において、それぞれ格子状の網目が形成され、二重構造の合成樹脂多孔管となっている。本構成例では、二重構造となっているため、目詰まりが効果的に防止され、また管体２２の内側と外側から形成された切目２６、２７により合成樹脂多孔管２１に適度な可撓性が付与され、曲がり部への施工にも容易に適用可能となる。
本構成例においては、連結部２５の数は管の大きさ、用途等に応じて任意の数に設定することができる。また連結部の大きさ、内管側及び外管側の薄肉部分の厚さ、切目２６、２７の幅及び深さ並びに各螺旋のピッチも管の大きさ、用途等に応じて任意に設定することができる。また、これらの寸法を変えることにより、網目の大きさ、密度等が任意に調整可能である。
本構成例のフレキシブル合成樹脂多孔管には、ポリエチレン、塩化ビニル、ＡＢＳ樹脂、アクリル樹脂、酢酸ビニル等の合成樹脂材料が好ましく使用される。また、本構成例では、外管には使用時に土圧が加わるので硬質材料を使用し、内管には軟質材料を使用することもできる。この場合、硬質材料としては、剛性を有するもので、例えば高密度ポリエチレン、硬質塩化ビニル、ポリスチレン、ＡＢＳ樹脂、アクリル樹脂等を使用することができ、また軟質材料としては、可撓性を有するもので、例えば低密度ポリエチレン、軟質塩化ビニル、酢酸ビニル等を使用することができる。
さらに、本構成例では、内管及び外管には同一の硬質材料を使用し、連結部には軟質材料を使用することもできる。また外管には硬質材料を使用し、内管及び連結部には軟質材料を使用することもできる。これらの場合、硬質材料及び軟質材料としてはそれぞれ上記と同様な材料を使用することができる。
上記の例では、合成樹脂多孔管の全面に格子状網目を形成したが、本発明によれば、一部に格子状網目を形成することもできる。
【００１１】
次に、上記構成のフレキシブル合成樹脂多孔管を製造する方法について説明する。上記各構成例の合成樹脂多孔管は基本的には同じ原理に基づく方法により製造できるため、ここでは図１の合成樹脂多孔管の製造方法について説明する。
図６は、図１の構成例のフレキシブル合成樹脂多孔管を製造する装置を模式的に示すもので、図中３１は押出し機、３２は押出し金型、１３は冷却水、１４はテンションローラー、３５は第１の切断機構、３６は第２の切断機構である。
押出し金型３２からは、管体内周面に長手方向に沿って隆条を列設した製品aを連続的に製造し、これをテンションローラー３４により強制的に牽引して引き出す。ここで、押出し用金型３２の先端ないしその近傍に取付けた第１の切断機構は、製品aのまわりを製品の外側において回転可能になっている。そしてその刃先は管体の外側から製品の隆条を残して管を横切る螺旋状の切目及び切込みを一定ピッチで形成する。これら切目及び切込みは、上記テンションローラー３４による牽引及び第１の切断機構の回転速度を調節することにより、その形状が調整できるようになっている。また、押出し用金型３２の先端ないしその近傍に取付けた第２の切断機構は、製品aのまわりを製品の内側において回転可能になっている。そしてその刃先は管体の内側から製品の隆条に螺旋に沿った間欠的な切込みを一定ピッチで形成する。この螺旋のピッチは上記螺旋状の切目及び切込みとは半ピッチだけずれるように形成される。このため、第１の切断機構の回転刃と第２の切断機構の回転刃は１８０度だけ位相がずれるように配置される。これら回転刃を毎秒１５〜１５０回転の回転速度で回転させながら、強制的牽引を行うことにより図１に示すようなフレキシブル合成樹脂多孔管が得られる。
【００１２】
第１の切断機構の回転刃及び第２の切断機構の回転刃は、従来公知の手法により、それぞれ製品aの外側及び内側を回転し、かつ製品aに所要の切目ないし切込みを刻設するように設置される。
図３及び図５に示す構成例も上記と同様な方法により製造することができる。
【００１３】
【発明の効果】
本発明によれば、以下のような顕著なる効果を得ることができる。
（１）従来一定長さの管として型造されていた合成樹脂多孔管を、押出し成形形により連続した一連の管として製造することができる。
（２）押出し成形で製造できるので、生産費用が安価である。
（３）一般押出し金型で内、外周面を成形できるため、特別な金型を必要としない。このため金型の作製コストが非常に安価となる。
（４）管自体がフレキシブルであるため、曲がり部分への施工の際に別の部品を必要とせず、施工が容易で、手間がかからない。
（５）目詰まりが効果的に防止された二重構造の多孔管の提供が可能となる。
（６）金型本体は一般押出し金型と同様、回転等の運動をさせる必要がないため、例えば外周長手方向に一部変形部分を有するような製品も容易に作り出せる。
（７）一般押出し成形で利用できる材料であるならば、本来成形しにくいとされてきた硬質塩化ビニルのような押出し圧力が非常に高く熱分解を起こしやすいような材質でも、網目状に成形可能である。
【図面の簡単な説明】
【図１】本発明によるフレキシブル合成樹脂多孔管の一構成例を示す斜視図である。
【図２】図１の多孔管の一部を拡大して示す図である。
【図３】本発明による別のフレキシブル合成樹脂多孔管の別の構成例を示す図２と同様の図である。
【図４】網目形成前の二重管の斜視図である。
【図５】本発明によるフレキシブル合成樹脂二重多孔管の構成例を示す斜視図である。
【図６】本発明によるフレキシブル合成樹脂多孔管の製造装置を模式的に示す全体概略図である。
【図７】従来の合成樹脂多孔管を示す斜視図である。
【図８】本発明者が先に提案した合成樹脂多孔管の斜視図である。
【符号の説明】
１合成樹脂多孔管２管体
３隆条４切目
５、６切込み７透孔
１１合成樹脂多孔管１２管体
１３隆条１４切目
１５、１６切込み２１合成樹脂多孔管
２２内管２３外管
２４連結部２５、２６切目[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible synthetic resin single and double perforated pipe in which a part of the entire peripheral surface or the entire peripheral surface is formed in a lattice network, and a method for manufacturing the same.
[0002]
As shown in FIG. 7, the synthetic resin porous tube has a lattice-like mesh on the circumferential surface, or a portion along the longitudinal direction of the synthetic resin, and a part of the circumferential surface shown in the figure is a mesh. It is suitable as a strainer to be attached to the tip of a water absorption pipe of a well, such as a water distribution pipe in a gutter buried in the ground, a rainwater infiltration pipe, etc., and the entire peripheral surface is a mesh.
[0003]
Conventionally, these synthetic resin porous tubes can only be obtained as a tube of a predetermined length by injection molding using a mold, and unlike ordinary synthetic resin tubes, they cannot be manufactured as a series of tubes by extrusion molding. It was said.
[0004]
In view of this, the present inventor proposed in JP-A-2-52729 (Patent No. 2556359) a method of manufacturing a synthetic resin porous tube in which at least a part of the peripheral surface is formed in a lattice-like mesh by extrusion molding. . In this method, a product in which ridges are arranged along the longitudinal direction on the peripheral surface of the pipe body is continuously manufactured by extrusion molding, and the cuts that cross the pipe are left at regular intervals while leaving the ridges on the product. It is provided and the product is pulled in the extrusion direction, and the ridges between the cuts are stretched to form a grid-like network. This makes it possible to provide a synthetic resin porous tube continuously, extremely efficiently, and at a low cost. FIG. 8 shows a synthetic resin porous tube obtained by this method.
[0005]
However, the synthetic resin porous tube having the structure in which the ridges are arranged along the longitudinal direction on the tube body as described above cannot be used by being bent because of its structure. At that time, it was necessary to use a socket with a different processing. The need for other parts in this way is disadvantageous in terms of cost and also takes time for construction.
In addition, there is a bellows-like pipe with holes to cope with the bent part, but in this case, there is a limit to the numerical aperture, and the opening area cannot be increased compared to the original porous pipe, The efficiency was never good.
Furthermore, in order to prevent clogging, it is preferable to make a synthetic resin porous tube with a double structure, but it is difficult to make a double structure due to the structure of the mold in the conventional manufacturing method. Of course, it was impossible to bend the product.
[0006]
[Problems to be solved by the invention]
The present invention solves such problems of the prior art at once, has excellent suction and drainage efficiency, and does not require separate parts when applied to a bent portion, and is easy to handle and inexpensive to manufacture. It is an object of the present invention to provide a synthetic resin porous tube and a method for producing the same.
In addition, the present invention is a synthetic resin double-porous material that can be efficiently manufactured at low cost, especially when clogging is effectively prevented, and does not require separate parts when applied to a bent portion. Another object is to provide a tube and a method for manufacturing the same.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventor has completed the present invention.
That is, according to the present invention, the ridges are arranged along the longitudinal direction on the peripheral surface of the pipe body, and the spiral cuts and cuts crossing the pipe leaving the ridges are arranged at a constant pitch on the outer peripheral surface of the pipe body. An incision is engraved at a position along the spiral connecting the intermediate positions of the spiral adjacent cuts on the ridge on the peripheral surface side of the tubular body. There is provided a flexible synthetic resin porous tube characterized in that a lattice-like network is formed by the remaining portions and the ridges, and flexibility is imparted by the respective cuts.
Further, according to the present invention, the ridges are arranged along the longitudinal direction on the outer peripheral surface of the tubular body, and the spiral cuts and incisions crossing the pipe leaving the ridges are arranged at a constant pitch in the peripheral surface of the tubular body. Cut at at least a part of the side of the tube, and at the outer peripheral surface side of the tube, the ridges are each cut at a position along a spiral connecting intermediate positions of the adjacent notches of the spiral. There is provided a flexible synthetic resin porous tube characterized in that a lattice-like network is formed by the remaining portions and the ridges, and flexibility is imparted by the respective cuts.
Further, according to the present invention, in a tubular body composed of an inner tube, an outer tube, and a plurality of radial connecting portions extending in the longitudinal direction, the spiral cut across the outer tube leaving the inner tube is provided. It is engraved on at least a part of the outer peripheral surface of the pipe body at a constant pitch, and the spiral cut across the inner pipe leaving the outer pipe is the same pitch as the above-mentioned constant pitch and shifted by a half pitch from the above-mentioned constant pitch. In this way, a lattice-like mesh is formed on the outer tube side and the inner tube side by the outer tube remaining portion and the connecting portion, and the inner tube remaining portion and the connecting portion, respectively. A flexible synthetic resin double porous tube is provided.
In addition, according to the present invention, a product in which ridges are arranged along the longitudinal direction on the peripheral surface of the pipe body is continuously manufactured by extrusion molding, and the product is provided on the outer side of the pipe near the tip of the extrusion mold. The first cutting blade is rotated to leave the ridges at the blade edge, and spiral notches and cuts across the tube are cut at a constant pitch on at least a part of the outer peripheral surface side of the tube, and at the same time, the extrusion metal A second cutting blade provided inside the tube is rotated in the vicinity of the tip of the mold, and along the spiral connecting the middle position of the spiral adjacent cuts to the ridge at the blade peripheral surface side at the blade edge There is provided a method for producing a flexible synthetic resin porous tube, in which incisions are engraved at respective positions, and the product is pulled and stretched in the extrusion direction, and a lattice-like network is formed by the remaining tubular body and the ridges. Provided.
Further, according to the present invention, by continuously forming products in which ridges are arranged along the longitudinal direction on the outer peripheral surface of the tube body by extrusion molding, the product is provided inside the tube near the tip of the extrusion mold. The first cutting blade is rotated to leave the ridges at the blade edge, and at the same time, at the part of the outer peripheral surface side of the tube body with a spiral cut across the tube and a constant cut, the extrusion mold A position along the spiral that rotates the second cutting blade provided outside the tube in the vicinity of the tip of the tube and connects the intermediate position between the spiral adjacent cuts to the ridge on the outer peripheral surface side of the tube at the blade edge Provided with a method for producing a flexible synthetic resin porous tube, in which a notch is cut in each, and the product is pulled and stretched in the extruding direction to form a lattice-like network with the remaining portion of the tube and the ridge. Is done.
Furthermore, according to the present invention, a tubular product comprising an inner tube, an outer tube, and a plurality of radial connecting portions extending in the longitudinal direction for connecting them is continuously manufactured by extrusion molding, and an extrusion mold is used. At least a part of the outer peripheral surface side of the tubular body at a constant pitch is rotated at a constant pitch by rotating a first cutting blade provided outside the tube in the vicinity of the tip of the tube and leaving the inner tube at the blade edge and crossing the outer tube At the same time, the second cutting blade provided inside the tube is rotated in the vicinity of the tip of the extrusion die, and the spiral cut across the inner tube is left at the blade edge to leave the outer tube. It is engraved in at least a part of the tube side of the tube so as to be the same pitch as the pitch and deviated by a half pitch from the above-mentioned constant pitch, and the product is pulled and stretched in the pushing direction, and the outer tube remaining portion, the connecting portion and the inner tube The outer pipe side and the inner part by the remaining part and the connecting part, respectively. Method of manufacturing a flexible synthetic resin double perforated tube and forming a lattice-shaped mesh on the side are provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail by way of examples.
FIG. 1 shows a configuration example of a flexible synthetic resin porous tube (hereinafter also simply referred to as a synthetic resin porous tube) according to the present invention. In the figure, reference numeral 1 denotes a synthetic resin perforated tube according to the present invention, in which a plurality of ridges 3 are arranged along the longitudinal direction on the inner peripheral surface side of the tube body 2, and at a constant pitch on the outside of the tube body. A spiral notch 4 having a predetermined width is formed so as to leave the ridge 3, and further, a part of the notch 5 is formed in the ridge 3. On the other hand, incisions 6 along a spiral with a constant pitch are intermittently formed in the ridges 3 arranged on the circumferential surface side of the tubular body. As shown in FIG. 2, it is desirable that the spiral pitch of the notches 4 to 5 and the spiral pitch of the notches 6 are shifted by a half pitch. As described above, the through holes 7 are formed in the tube body between the ridges 3 and 3 at regular intervals in the longitudinal direction, and a porous tube having a lattice-like mesh as a whole is formed. The remaining portion and each of the ridges 3 are joined at the intersection to obtain the required mechanical strength. Further, the cuts 5 and 6 provided in the ridge 3 give moderate flexibility to the synthetic resin porous tube, and can be easily applied to the bent portion.
In the above configuration example, the number of the ridges 3 can be set to an arbitrary number according to the size, application, and the like of the tube. Further, the size of the ridge 3, the thickness of the tube body 2, the width of the cut 4, the depth of the cuts 5 and 6, and the pitch of each spiral can be arbitrarily set according to the size and use of the tube. . Further, by changing these dimensions, the size and density of the mesh can be arbitrarily adjusted.
Synthetic resin materials such as polyethylene, vinyl chloride, ABS resin, acrylic resin, and vinyl acetate are preferably used for the flexible synthetic resin porous tube of this configuration example. In the above example, a lattice-like mesh is formed on the entire surface of the synthetic resin porous tube. However, according to the present invention, a lattice-like mesh can also be partially formed.
[0009]
Next, another example of the flexible synthetic resin porous tube according to the present invention will be described. In the above configuration example, a plurality of ridges are arranged along the longitudinal direction on the inner peripheral surface of the tubular body. However, in this configuration example, a plurality of ridges are formed along the longitudinal direction on the outer peripheral surface of the tubular body. Lined up. FIG. 3 is a diagram similar to FIG. 2 according to this configuration example. In FIG. 3, 11 is a synthetic resin porous tube, 12 is a tubular body, and 13 is a ridge. Further, the tubular body 12 is formed with a spiral cut 14 having a predetermined width at a constant pitch from the inner peripheral surface side so that the ridge 13 is left, and a part of the cut 5 is formed in the ridge 13. . On the other hand, on the outer peripheral side of the tubular body, cuts 16 along a spiral with a constant pitch are intermittently formed in the ridges 13 arranged in a row. As shown in FIG. 3, it is desirable that the spiral pitch of the notches 14 to 15 and the spiral pitch of the notches 16 be shifted by a half pitch. As described above, through holes are formed in the tube body between the ridges 13 and 13 at regular intervals in the longitudinal direction to form a porous tube having a lattice-like network as a whole, and the remaining portions other than the cuts 14 in the tube body. The parts and the ridges 13 are joined at the intersections to obtain the required mechanical strength. Further, the cuts 15 and 16 provided in the ridge 13 give moderate flexibility to the synthetic resin porous tube, and can be easily applied to the bending portion.
Also in this configuration example, the number of the ridges 13 can be set to an arbitrary number according to the size, application, and the like of the tube. Further, the size of the ridge 13, the thickness of the tube body 12, the width of the cut 14, the depth of the cuts 15 and 16, and the pitch of each spiral can be arbitrarily set according to the size of the tube, the application, and the like. . Further, by changing these dimensions, the size and density of the mesh can be arbitrarily adjusted.
The flexible synthetic resin porous tube of this structural example can use the same material as the synthetic resin material used for the said structural example.
In the above example, the lattice mesh is formed on the entire surface of the synthetic resin porous tube. However, according to the present invention, the lattice mesh may be partially formed.
[0010]
Next, an example of the flexible synthetic resin double porous tube according to the present invention will be described. The above two configuration examples relate to a single porous tube, but this configuration example relates to a double porous tube.
As shown in FIG. 4, the tube body 22 before forming the mesh in this configuration example includes an inner tube 23, an outer tube 24, and a plurality of radial connecting portions 25 that extend in the longitudinal direction. . In this configuration example, as shown in FIG. 5, in this tubular body 22, a spiral cut 26 that first crosses the outer tube 24 leaving the inner tube 23 is cut at least at a part on the outer peripheral surface side of the tubular body. Established. In addition, a spiral cut 27 that crosses the inner tube 23 leaving the outer tube 24 is engraved on at least a part of the tubular tube side so as to be shifted by the same pitch as the fixed pitch and by a half pitch from the fixed pitch. The A lattice-like network is formed on the outer tube side by the outer tube remaining portion and the connecting portion 25, and on the inner tube side by the inner tube remaining portion and the connecting portion 25, thereby forming a double-structured synthetic resin porous tube. Yes. In this configuration example, the double structure prevents clogging effectively, and the synthetic resin porous tube 21 is appropriately flexible by the cuts 26 and 27 formed from the inside and outside of the tube body 22. Therefore, it can be easily applied to bends.
In the present configuration example, the number of the connecting portions 25 can be set to an arbitrary number depending on the size of the tube, the usage, and the like. Further, the size of the connecting portion, the thickness of the thin portion on the inner tube side and the outer tube side, the width and depth of the cuts 26 and 27, and the pitch of each spiral are also arbitrarily set according to the size of the tube, the use, etc. be able to. Further, by changing these dimensions, the size and density of the mesh can be arbitrarily adjusted.
Synthetic resin materials such as polyethylene, vinyl chloride, ABS resin, acrylic resin, and vinyl acetate are preferably used for the flexible synthetic resin porous tube of this configuration example. In this configuration example, since earth pressure is applied to the outer tube during use, a hard material can be used, and a soft material can be used for the inner tube. In this case, the hard material has rigidity, for example, high-density polyethylene, hard vinyl chloride, polystyrene, ABS resin, acrylic resin, etc. can be used, and the soft material has flexibility. For example, low density polyethylene, soft vinyl chloride, vinyl acetate and the like can be used.
Further, in this configuration example, the same hard material can be used for the inner tube and the outer tube, and a soft material can be used for the connecting portion. Further, a hard material can be used for the outer tube, and a soft material can be used for the inner tube and the connecting portion. In these cases, materials similar to those described above can be used as the hard material and the soft material, respectively.
In the above example, a lattice-like mesh is formed on the entire surface of the synthetic resin porous tube. However, according to the present invention, a lattice-like mesh can also be partially formed.
[0011]
Next, a method for producing the flexible synthetic resin porous tube having the above configuration will be described. Since the synthetic resin porous tube of each of the above configuration examples can be basically manufactured by a method based on the same principle, a method for manufacturing the synthetic resin porous tube of FIG. 1 will be described here.
FIG. 6 schematically shows an apparatus for producing the flexible synthetic resin porous tube of the configuration example of FIG. 1, in which 31 is an extruder, 32 is an extrusion die, 13 is cooling water, 14 is a tension roller, Reference numeral 35 denotes a first cutting mechanism, and 36 denotes a second cutting mechanism.
From the extrusion die 32, products a in which ridges are arranged along the longitudinal direction on the peripheral surface of the pipe body are continuously manufactured, and this is forcibly pulled by the tension roller 34 and pulled out. Here, the 1st cutting mechanism attached to the front-end | tip of the metal mold | die 32 for extrusion, or its vicinity is rotatable in the outer side of the product a. The blade edge forms spiral cuts and cuts at a constant pitch across the tube leaving the product ridges from the outside of the tube. These cuts and cuts can be adjusted in shape by adjusting the pulling speed by the tension roller 34 and the rotational speed of the first cutting mechanism. Further, the second cutting mechanism attached to the front end of the extrusion mold 32 or in the vicinity thereof is rotatable around the product a inside the product. The cutting edge forms intermittent cuts along the spiral from the inside of the tube body to the product ridge at a constant pitch. The pitch of the spiral is formed so as to deviate from the spiral cuts and cuts by a half pitch. For this reason, the rotary blade of the first cutting mechanism and the rotary blade of the second cutting mechanism are arranged so that the phases are shifted by 180 degrees. A flexible synthetic resin porous tube as shown in FIG. 1 is obtained by forcibly pulling these rotary blades while rotating them at a rotational speed of 15 to 150 revolutions per second.
[0012]
The rotary blade of the first cutting mechanism and the rotary blade of the second cutting mechanism rotate outside and inside the product a, respectively, and make necessary cuts or cuts in the product a by a conventionally known method. Installed.
3 and 5 can also be manufactured by the same method as described above.
[0013]
【The invention's effect】
According to the present invention, the following remarkable effects can be obtained.
(1) A synthetic resin porous tube conventionally formed as a tube having a certain length can be manufactured as a continuous series of tubes by an extrusion molding shape.
(2) Since it can be manufactured by extrusion molding, the production cost is low.
(3) Since the inner and outer peripheral surfaces can be formed with a general extrusion mold, no special mold is required. For this reason, the manufacturing cost of a metal mold | die becomes very cheap.
(4) Since the pipe itself is flexible, no separate parts are required when constructing the bent portion, and the construction is easy and labor-saving.
(5) It is possible to provide a double-structured porous tube in which clogging is effectively prevented.
(6) Like the general extrusion mold, the mold body does not need to be moved by rotation or the like, and therefore, for example, a product having a partially deformed portion in the outer peripheral longitudinal direction can be easily produced.
(7) If it is a material that can be used in general extrusion molding, it can be molded into a mesh shape even with materials that have a very high extrusion pressure, such as hard vinyl chloride, which has been considered difficult to mold, and that is prone to thermal decomposition. It is.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one structural example of a flexible synthetic resin porous tube according to the present invention.
2 is an enlarged view of a part of the porous tube of FIG.
FIG. 3 is a view similar to FIG. 2 showing another configuration example of another flexible synthetic resin porous tube according to the present invention.
FIG. 4 is a perspective view of a double tube before forming a mesh.
FIG. 5 is a perspective view showing a configuration example of a flexible synthetic resin double porous tube according to the present invention.
FIG. 6 is an overall schematic view schematically showing an apparatus for producing a flexible synthetic resin porous tube according to the present invention.
FIG. 7 is a perspective view showing a conventional synthetic resin porous tube.
FIG. 8 is a perspective view of a synthetic resin porous tube previously proposed by the present inventor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin porous tube 2 Tubing body 3 Ridge 4 Incision 5 and 6 Notch 7 Through-hole 11 Synthetic resin porous tube 12 Tubing 13 Ridge 14 Incision 15 and 16 Incision 21 Synthetic resin porous tube 22 Inner tube 23 Outer tube 24 Connection Part 25, 26

Claims

The ridges are arranged along the longitudinal direction on the peripheral surface of the pipe body, and the spiral cuts and cuts that cross the pipe leaving the ridges are engraved on at least a part of the pipe outer peripheral surface side at a constant pitch. In addition, in the ridge on the peripheral surface side of the tubular body, incisions are formed in the ridges at positions along the spiral connecting intermediate positions of the adjacent spiral cuts, and the tubular body remaining portion and the ridges A flexible synthetic resin perforated tube, wherein a lattice-like network is formed, and flexibility is imparted by each of the cuts.

The ridges are arranged along the longitudinal direction on the outer peripheral surface of the tube body, and spiral notches and cuts that cross the tube are left on the peripheral surface side of the tube body at a constant pitch. And on the outer peripheral surface side of the tubular body, the ridges are respectively cut at positions along the spiral connecting intermediate positions of the adjacent spiral cuts, and the tubular body remaining portion and the ridges A flexible synthetic resin perforated tube, wherein a lattice-like network is formed, and flexibility is imparted by each of the cuts.

A tubular body composed of an inner tube, an outer tube, and a plurality of radial connecting portions extending in the longitudinal direction for connecting them, and a spiral cut across the outer tube leaving the inner tube at a constant pitch on the outer peripheral surface side of the tube At least a part of the inner tube side so that a spiral cut across the inner tube leaving the outer tube is shifted at the same pitch as the fixed pitch and by a half pitch from the fixed pitch. A flexible composition characterized in that a lattice-like mesh is formed on the outer tube side and the inner tube side by the outer tube remaining portion and the connecting portion, and the inner tube remaining portion and the connecting portion, respectively. Resin double porous tube.

The flexible synthetic resin double porous tube according to claim 3, wherein the inner tube and the connecting portion are made of a soft material, and the outer tube is made of a hard material.

The flexible synthetic resin double porous tube according to claim 3, wherein the inner tube and the outer tube are made of a hard material, and the connecting portion is made of a soft material.

By continuously forming products with ridges along the longitudinal direction on the peripheral surface of the tube by extrusion, the first cutting blade provided on the outside of the tube near the tip of the extrusion mold is rotated. Then, a spiral cut and cut across the pipe leaving the ridge at the blade edge are engraved in at least a part of the outer peripheral surface side of the pipe body at a constant pitch, and at the same time, inside the pipe near the tip of the extrusion mold. The provided second cutting blade is rotated, and a cut is engraved at a position along the spiral connecting the intermediate position of the spiral adjacent cuts to the ridge on the peripheral surface side of the tubular body at the blade edge. Further, a method for producing a flexible synthetic resin porous tube, wherein the product is further pulled and stretched in the extrusion direction to form a lattice-like network by the tubular body remaining portion and the ridges.

By continuously forming products with ridges arranged along the longitudinal direction on the outer peripheral surface of the tube by extrusion, the first cutting blade provided inside the tube is rotated near the tip of the extrusion mold In addition, a spiral cut across the tube leaving the ridge at the blade edge and at least a part of the outer peripheral surface side of the tube body is engraved at a constant pitch, and at the same time provided outside the tube near the tip of the extrusion mold The second cutting blade is rotated, and the cutting edge is cut at each position along the spiral connecting the intermediate position between the spiral adjacent cuts on the ridge on the outer peripheral surface side of the tubular body at the blade edge, A method for producing a flexible synthetic resin porous tube, characterized in that a product is pulled and stretched in an extruding direction, and a lattice-like network is formed by the remaining portion of the tube and the ridges.

A tubular product consisting of an inner tube, an outer tube, and a plurality of radial connecting portions extending in the longitudinal direction that connect them is continuously manufactured by extrusion, and is provided outside the tube near the tip of the extrusion mold. The first cutting blade is rotated to leave the inner tube at the cutting edge, and a spiral cut across the outer tube is cut at a constant pitch on at least a part of the outer peripheral surface side of the tube, and at the same time for extrusion A second cutting blade provided inside the tube is rotated in the vicinity of the tip of the mold, and a spiral cut across the inner tube is left at the blade edge, leaving the outer tube at the same pitch as the fixed pitch and the fixed pitch. Engraved on at least a part of the tube side of the tube so as to deviate by a half pitch from the pitch, and the product is pulled and stretched in the extrusion direction, and the outer tube remaining portion and the connecting portion and the inner tube remaining portion and the connecting portion respectively. Lattice-like mesh is formed on the outer tube side and the inner tube side Method of manufacturing a flexible synthetic resin double perforated tube, characterized in Rukoto.