JP2791823B2 - Internal pressure type tubular membrane member - Google Patents
Internal pressure type tubular membrane memberInfo
- Publication number
- JP2791823B2 JP2791823B2 JP2150276A JP15027690A JP2791823B2 JP 2791823 B2 JP2791823 B2 JP 2791823B2 JP 2150276 A JP2150276 A JP 2150276A JP 15027690 A JP15027690 A JP 15027690A JP 2791823 B2 JP2791823 B2 JP 2791823B2
- Authority
- JP
- Japan
- Prior art keywords
- tape
- internal pressure
- tube
- pressure type
- membrane
- 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/156—Making tubes with wall irregularities
- B21C37/157—Perforations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0826—Preparing the edges of the metal sheet with the aim of having some effect on the weld
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/126—Supply, or operations combined with supply, of strip material
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は内圧型管状膜部材に関するものである。Description: TECHNICAL FIELD The present invention relates to an internal pressure type tubular membrane member.
（従来の技術） コロイド物質、蛋白質、微生物などの比較的大きい物
質乃至は分子を溶液から分離することのできる限外濾過
膜乃至は精密濾過膜、あるいは、イオン類、低分子物等
の比較的小さい物質乃至は分子を溶液から分離すること
のできる逆浸透膜（以下、逆浸透膜を含めて、単に、透
過膜という）は、工場排水の処理、下水処理、下水から
の水の回収、罐水や海水の淡水化、更には、食品、医
薬、醸造、発酵関係における精製、濃縮工程などに利用
されている。(Prior Art) An ultrafiltration membrane or a microfiltration membrane capable of separating a relatively large substance or molecule such as a colloid substance, a protein, or a microorganism from a solution, or a relatively large substance such as an ion or a low molecular substance. Reverse osmosis membranes (hereinafter, simply referred to as permeable membranes including reverse osmosis membranes) that can separate small substances or molecules from a solution are used to treat factory wastewater, treat sewage, collect water from sewage, It is used for desalination of water and seawater, as well as for purification and concentration processes in the fields of food, medicine, brewing, and fermentation.
上記透過膜を用いた膜モジールには種々の型式のもの
が存在し、その膜モジュールの一型式として内圧型管状
膜モジュールが知られている。There are various types of membrane modules using the permeable membrane, and an internal pressure type tubular membrane module is known as one type of the membrane module.
この内圧型膜モジュールにおける透過機構は、外面に
織布または不織布等の補強層を設けた管状透過膜を孔明
支持管内に挿入し、この管状透過膜内に原液を加圧下で
流通させ、原液中の溶媒を透過膜に透過させて織布又は
不織布等の補強層内の間隙を縫って孔明支持管の孔に導
くことにある。The permeation mechanism in the internal pressure type membrane module is such that a tubular permeable membrane provided with a reinforcing layer such as a woven or nonwoven fabric on the outer surface is inserted into a perforated support tube, and the undiluted solution flows through the tubular permeable membrane under pressure. Is permeated through a permeable membrane to sew a gap in a reinforcing layer such as a woven fabric or a nonwoven fabric and to lead the hole to a hole of a perforated support tube.
上記において、孔明支持管の孔の大きさが大き過ぎる
と、透過膜が織布等の補強層と共に孔に食い込み、透過
膜が過酷な歪を受けて破損するに至る。従って、孔を小
さくすることが望まれるが、孔を小さくするためには、
支持管単位長さ当たりの孔の個数を多くして、透過液流
通抵抗の増大を避けなければならず、支持管の強度低下
を免れ得ない。In the above description, if the size of the hole of the perforated support tube is too large, the permeable membrane cuts into the hole together with the reinforcing layer such as a woven fabric, and the permeable membrane is damaged by severe strain. Therefore, it is desirable to make the hole smaller, but in order to make the hole smaller,
The number of holes per unit length of the support tube must be increased to avoid an increase in permeate flow resistance, and the strength of the support tube cannot be avoided.
ところで、支持管の孔を細巾のスリット孔とすれば、
丸孔に較べて、孔面積の同一下、上記透過膜の孔への食
い込みを生じにくくし得、従って透過膜の破損を良く防
止でき、有利である。By the way, if the hole of the support tube is a narrow slit hole,
As compared with the round hole, the permeable membrane can be less likely to bite into the hole under the same hole area, and therefore, the breakage of the permeable membrane can be prevented well, which is advantageous.
従来、孔明支持管の製造方法として、金属テープの長
さ方向に一定の間隔で丸孔を穿孔し、この穿孔金属テー
プを密接状態の螺旋状に形成して管状に成し、該テープ
の螺旋合わせ目を溶接する方法が公知である。Conventionally, as a method of manufacturing a perforated support tube, round holes are drilled at regular intervals in the length direction of a metal tape, and the perforated metal tape is formed into a tight spiral shape to form a tube. Methods for welding seams are known.
（解決しようとする課題） しかし、この方法において、金属テープに丸孔を穿孔
することに代え上記の細巾スリッス孔を穿孔しても、金
属テープを真円度の良い管状に形成し難い。その理由
は、金属テープを密接状態の螺旋状に曲げ加工して管状
に形成するには、第５図及び第６図（第５図の右側面
図）に示すように、金属テープを斜めに向けた状態で、
管軸の廻りに曲げる必要があり、その時の曲げモーメン
トＭはテープ長さ方向の曲げモーメント成分Mcosθと、
テープ巾方向の曲げモーメント成分Msinθとのベクトル
和であって、テープ巾方向の曲げモーメント成分Msinθ
に対し、金属テープ１′がスリット箇所２′、…におい
て、他の部分より小さな曲率半径で曲がってしまい、金
属テープ全巾にわたって曲率を一様にできないためであ
る（テープ長さ方向の曲げモーメント成分Mcosθに対す
るテープの曲げ剛性は実質上一定であり、このモーメン
ト成分のために管の真円度が影響を受けるようなことは
ない）。(Problem to be Solved) However, in this method, it is difficult to form the metal tape into a tube with good roundness even if the narrow slit hole is formed instead of the round hole in the metal tape. The reason is that, in order to form a tubular shape by bending a metal tape into a spiral in a close contact state, as shown in FIGS. 5 and 6 (a right side view of FIG. 5), the metal tape is inclined obliquely. In the state
It is necessary to bend around the pipe axis, and the bending moment M at that time is a bending moment component Mcosθ in the tape length direction,
The vector sum with the bending moment component Msinθ in the tape width direction, and the bending moment component Msinθ in the tape width direction
On the other hand, the metal tape 1 'bends at the slit portions 2' with a smaller radius of curvature than the other portions, and the curvature cannot be made uniform over the entire width of the metal tape (bending moment in the tape length direction). The bending stiffness of the tape with respect to the component Mcosθ is substantially constant and this moment component does not affect the roundness of the tube).
従って、かかる孔明管では、金属テープの合わせ目に
段差が生じ、孔明管内面の段差で透過膜が過酷な歪を受
けて損傷する畏れがある。Therefore, in such a perforated tube, there is a possibility that a step is generated at the joint of the metal tapes and the step on the inner surface of the perforated tube causes the permeable membrane to be severely damaged and damaged.
本発明の目的は、孔明管による透過膜の歪損傷を良好
に防止できる内圧型管状膜部材を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an internal pressure type tubular membrane member capable of favorably preventing strain damage to a permeable membrane caused by a perforated tube.
（課題を解決するための手段） 本発明に係る内圧型管状膜部材は、少なくとも一方の
縁端を凹凸状にしたテープ状材料の管状成形体の合わせ
目を上記凸状部において溶接し上記凹状部でスリット孔
を形成した孔明管に、外面に織布または不織布の補強層
を設けた管状透過膜を挿入してなることを特徴とする構
成である。(Means for Solving the Problems) The internal pressure type tubular membrane member according to the present invention is characterized in that the joint of a tubular molded body of a tape-shaped material having at least one edge formed into an irregular shape is welded at the convex portion to form the concave shape. A tubular permeable membrane provided with a reinforcing layer of a woven or non-woven fabric on the outer surface is inserted into a perforated tube having a slit hole formed in a portion.
（作用） テープ状材料の巾を実質上一定にでき、テープ状材料
の長さ方向の曲げモーメントに対する曲げ剛性及びテー
プ状材料の巾方向の曲げモーメントに対する曲げ剛性を
テープ状材料の全長にわたり一様にできるため、テープ
状材料の管状成形を管全長にわたり一様な曲げ径で行い
得、合わせ目での段差の発生を防止できる。(Function) The width of the tape-shaped material can be made substantially constant, and the bending rigidity of the tape-shaped material with respect to the bending moment in the longitudinal direction and the bending rigidity of the tape-shaped material with respect to the bending moment in the width direction are uniform over the entire length of the tape-shaped material. Therefore, the tape-shaped material can be formed into a tube with a uniform bending diameter over the entire length of the tube, and the occurrence of a step at the joint can be prevented.
また、孔をスリット孔にできる。 Also, the holes can be slit holes.
従って、内圧型管状膜部材の透過膜の原液による加圧
時、孔明管内面の段差への膜の緊圧や孔への膜の食い込
みを排除でき、膜の歪損傷を良好に防止できる。Therefore, when the permeable membrane of the internal pressure type tubular membrane member is pressurized with the undiluted solution, it is possible to eliminate the pressure of the membrane on the step on the inner surface of the perforated tube or the penetration of the membrane into the hole, and to prevent the membrane from being damaged and damaged.
（実施例の説明） 本発明に係る内圧型管状膜部材は、図１に示すテープ
状材料が密接状態の螺旋状に形成され、この螺旋状合わ
せ目に一定の間隔I1を隔てて長さI2、巾ｄのスリット孔
2,…が設けられてなる孔明管（Ｒは孔明管の直径）に、
外面に織布または不織布の補強層を設けた管状透過膜を
挿入することに得られる。Pressure tubular film member according to the present invention (described in Example) is formed spirally of tight contact tape-shaped material shown in FIG. 1, the length at regular intervals I 1 in the spiral seam I 2 , slit hole of width d
An aperture tube (R is the diameter of the aperture tube) provided with 2, ...
It is obtained by inserting a tubular permeable membrane provided with a woven or non-woven reinforcing layer on the outer surface.
この孔明管を製造するには、第２図に示すように、溶
接可能なテープ状材料（金属テープ、プラスチックテー
プ等）１の一縁端に、間隔I1を隔てて、長さI2、深さｄ
の凹部２を形成する。Ｗはテープ状材料１の巾を示して
いる。In order to manufacture this perforated tube, as shown in FIG. 2, one end of a weldable tape-like material (metal tape, plastic tape, etc.) 1 is spaced apart by a distance I 1 from a length I 2 , Depth d
Is formed. W indicates the width of the tape-shaped material 1.
そして、このテープ状材料１を第３図に示すように角
度θ（θ＝cos-1W/πＤ）で密接状態の螺旋状に曲げ加
工し、テープ縁端の合わせ目に上記凹部２により開口部
を存在させ、テープ縁端の凹部２以外の部分10、すなわ
ち開口部の間の部分（長さI1の部分）を溶接していく。Then, this tape-shaped material 1 is bent into a tight spiral at an angle θ (θ = cos -1 W / πD) as shown in FIG. parts in the presence of the recess 2 except portions 10 of the tape edge, i.e. continue to weld the portion (portion of the length I 1) between the openings.
上記において、I2/（I1＋I2）の比は、0.1〜0.9とす
ることが適切である。0.9以上では、管製造時での引張
り強度が余りにも小さくなり過ぎ、孔明管の製造に支障
となる。他方、0.1以下では、前記した内圧型管状膜モ
ジュールの支持管として使用する場合に必要とされる透
過液流通に対しての低抵抗値を保証し難くなる。In the above, the ratio of I 2 / (I 1 + I 2 ) is suitably from 0.1 to 0.9. If it is 0.9 or more, the tensile strength at the time of manufacturing the pipe becomes too small, which hinders the manufacture of a perforated pipe. On the other hand, if it is 0.1 or less, it is difficult to guarantee a low resistance value to permeate flow required when used as a support tube for the internal pressure type tubular membrane module.
上記スリットの巾ｄは1.5mm以下であり、テープ巾Ｄ
（25〜45mm）に対する比d/Dは0.06以下である。The slit width d is 1.5 mm or less, and the tape width D
(25-45 mm) d / D is 0.06 or less.
テープ材料は孔明管の用途に応じて適宜に選択され
る。当該孔明管を内圧型管状膜モジュールの支持管とし
て使用する場合は、厚み0.6〜1.0mmのSUS304、303テー
プ塔を使用することが好ましい。The tape material is appropriately selected depending on the use of the aperture tube. When the perforated tube is used as a support tube for an internal pressure type tubular membrane module, it is preferable to use a SUS304, 303 tape tower having a thickness of 0.6 to 1.0 mm.
上記テープ縁端の凹凸はテープの両縁端に形成するこ
ともできる。The irregularities at the edge of the tape may be formed on both edges of the tape.
又、凹凸の形状は、第４図に示すような異形形状とす
ることもできる。Further, the shape of the unevenness may be an irregular shape as shown in FIG.
上記螺旋状の角度θはは10〜50゜の範囲とすることが
適当であるが、０゜とすること、すなわち、テープ状材
料の合わせ目を円管の中心軸に平行とすることも可能で
ある。The spiral angle θ is suitably in the range of 10 to 50 °, but may be 0 °, that is, the seam of the tape-shaped material may be parallel to the central axis of the circular tube. It is.
上記テープ状材料の合わせ目の溶接には、被覆アーク
溶接、アルゴンガス溶接、電子ビーム溶接、プラズマア
ーク溶接等を使用できる。For welding the joint of the tape-like material, coated arc welding, argon gas welding, electron beam welding, plasma arc welding, or the like can be used.
上記孔明管においては、突き合わせたテープ縁端の溶
接に伴い管内面即にビートが発生する。孔明管を内圧型
管状膜モジュールの支持膜として使用する場合、このビ
ートの高さを200μｍ以下とする必要がある。In the above-mentioned perforated tube, a beat is generated immediately on the inner surface of the tube as the butted edges of the tape are welded. When using a perforated tube as a support membrane for an internal pressure type tubular membrane module, the height of the beat must be 200 μm or less.
（発明の効果） 本発明に係る内圧型管状膜部材の孔明管においては、
テープ状材料の長さ方向の曲げモーメントに対する曲げ
剛性及びテープ状材料の巾方向の曲げモーメントに対す
る曲げ剛性をテープ状材料の全長にわたり実質的に一様
であるテープ状材料を管状に形成し、合わせ目を溶接し
てあるから、管状体の全長にわたり管状成形の際の曲げ
径を一様にでき、合わせ目に段差が生じるのを防止でき
る。従って、内圧型管状膜部材の透過膜の原液による加
圧時、孔明管内面に段差が在る場合に生じるの膜の緊圧
に基づく膜の歪損傷を良好に防止できる。(Effect of the Invention) In the aperture tube of the internal pressure type tubular membrane member according to the present invention,
Forming a tape-shaped material into a tube, the bending rigidity of the tape-shaped material with respect to the longitudinal bending moment and the bending rigidity of the tape-shaped material with respect to the width-direction bending moment are substantially uniform over the entire length of the tape-shaped material; Since the eyes are welded, the bending diameter during the tubular forming can be made uniform over the entire length of the tubular body, and the occurrence of a step at the joint can be prevented. Therefore, when the permeable membrane of the internal pressure type tubular membrane member is pressurized with the undiluted solution, it is possible to favorably prevent the membrane from being damaged due to the tension of the membrane caused when there is a step on the inner surface of the aperture tube.
また、孔明管の孔をスリット孔にしてあるから、内圧
型管状膜部材の透過膜の原液による加圧時、孔明管のへ
の膜の食い込みも排除でき、膜の歪損傷を良好に防止で
きる。In addition, since the hole of the perforated tube is a slit hole, it is possible to eliminate the biting of the membrane into the perforated tube when pressurizing the permeable membrane of the internal pressure type tubular membrane member with the undiluted solution, and it is possible to prevent distortion damage of the membrane satisfactorily. .
第１図は本発明において使用する孔明管を示す図面、第
２図は同孔明管に使用するテープ状材料を示す図面、第
３図は同孔明管の製造方法を示す図面、第４図は本発明
において使用する孔明管の別例を示す図面、第５図は公
知の孔明管を示す図面、第６図は図５の孔明管の右側面
図である。 １……テープ状材料、２……凹部、Ｉ……溶接部分。FIG. 1 is a view showing a perforated pipe used in the present invention, FIG. 2 is a view showing a tape-shaped material used for the perforated pipe, FIG. 3 is a view showing a method for manufacturing the perforated pipe, and FIG. FIG. 5 is a view showing another example of a perforated tube used in the present invention, FIG. 5 is a diagram showing a known perforated tube, and FIG. 6 is a right side view of the perforated tube of FIG. 1 ... tape-like material, 2 ... recess, I ... welding part.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B21C 37/15 B01D 63/00 - 63/08Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) B21C 37/15 B01D 63/00-63/08
Claims (1)
プ状材料の管状成形体の合わせ目を上記凸状部において
溶接し上記凹状部でスリット孔を形成した孔明管に、外
面に織布または不織布の補強層を設けた管状透過膜を挿
入してなることを特徴とする内圧型管状膜部材。1. A perforated tube formed by welding a seam of a tubular molded body of a tape-shaped material having at least one of its edges with irregularities at said convex portion and forming a slit hole at said concave portion, and a woven fabric on an outer surface. Alternatively, an internal pressure type tubular membrane member obtained by inserting a tubular permeable membrane provided with a reinforcing layer of a nonwoven fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2150276A JP2791823B2 (en) | 1990-06-08 | 1990-06-08 | Internal pressure type tubular membrane member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2150276A JP2791823B2 (en) | 1990-06-08 | 1990-06-08 | Internal pressure type tubular membrane member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0441016A JPH0441016A (en) | 1992-02-12 |
| JP2791823B2 true JP2791823B2 (en) | 1998-08-27 |
Family
ID=15493427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2150276A Expired - Fee Related JP2791823B2 (en) | 1990-06-08 | 1990-06-08 | Internal pressure type tubular membrane member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2791823B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140142668A (en) * | 2013-06-03 | 2014-12-12 | 빗젠만 게엠베하 | Method and apparatus for cutting of the corrugated tube |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005006579B3 (en) * | 2005-02-11 | 2006-03-30 | Benteler Automobiltechnik Gmbh | Production of tubes comprises providing sheet metal plates with contact bumps suitable for a resistance welding process before deformation along longitudinal sides to be joined together |
| DE102011007660A1 (en) * | 2011-04-19 | 2012-10-25 | Hilti Aktiengesellschaft | Hand tool and manufacturing process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289915A (en) * | 1985-06-18 | 1986-12-19 | Sumitomo Metal Ind Ltd | Manufacture of strainer pipe |
-
1990
- 1990-06-08 JP JP2150276A patent/JP2791823B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140142668A (en) * | 2013-06-03 | 2014-12-12 | 빗젠만 게엠베하 | Method and apparatus for cutting of the corrugated tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441016A (en) | 1992-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |