CH420586A - Welded connection of two overlapping plastic sheets or strips - Google Patents

Welded connection of two overlapping plastic sheets or strips

Info

Publication number
CH420586A
CH420586A CH1045963A CH1045963A CH420586A CH 420586 A CH420586 A CH 420586A CH 1045963 A CH1045963 A CH 1045963A CH 1045963 A CH1045963 A CH 1045963A CH 420586 A CH420586 A CH 420586A
Authority
CH
Switzerland
Prior art keywords
welded
strips
channel
welded connection
test
Prior art date
Application number
CH1045963A
Other languages
German (de)
Inventor
Leschus Gerd
Original Assignee
Leschus Gerd
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 Leschus Gerd filed Critical Leschus Gerd
Publication of CH420586A publication Critical patent/CH420586A/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82Testing the joint
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/432Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82Testing the joint
    • B29C65/8207Testing the joint by mechanical methods
    • B29C65/8246Pressure tests, e.g. hydrostatic pressure tests

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

       

  
 



  Schweissverbindung zweier einander überlappender Kunststoffbahnen oder   -bänder   
Die Erfindung bezieht sich auf eine Schweissverbindung zweier einander überlappender Kunststoffbahnen   oder -bänder,    wobei in der   tÇberlappungs-    zone ein Längskanal zur Druckprüfung vorgesehen ist.



   Kunststoffbahnen oder -bänder werden bekanntlich in der Praxis auch vielfach im Baugewerbe zur Abdichtung verwendet. Wenn es sich hier dann um grosse Flächen handelt, müssen die Bahnen oder Bänder entlang ihren Längskanten aneinandergeschweisst   werden.    Man stellt nun je nach dem Verwendungszweck der Bahnen überlappte Schweissverbindungen ebenso her, wie auch Schweissverbindungen, bei denen die miteinander zu verschweissenden Bahnen mit ihren Längskanten stumpf aneinander stossen. Es ist hierbei ausserordentlich wichtig, dass die gesamte Schweissverbindung auch dicht ist.



   Damit man nun auch technisch in der Lage ist, die Schweissverbindung auf Dichtigkeit zu prüfen, ist es bekanntgeworden, innerhalb der Schweisszone einen Prüfkanal vorzusehen, der praktisch aus einem Kunststoffstreifen gebildet wird, der z. B. bei einer überlappten Verbindung nahe der Längsseitenkante der einen Bahn auf dieser ebenso angeschweisst wird, wie auch ausserhalb dieser Längsseitenkante auf der Gegenbahn. Durch dieses Verformen dieses Prüfstreifens um seine Längsachse wölbt man diesen Prüfstreifen und bildet im angeschweissten Zustand dieses Streifens somit einen Kanal, der an einem Ende verschlossen wird, während man am gegen überliegenden offenen Ende ein Druckmittel, z. B.



  Druckluft, Wasser od. dgl. eingibt. Bleibt der Druck konstant, ist die Schweissverbindung dicht, während bei Druckabfall eine Undichtigkeit erkannt wird.



   Es liegt hier auf der Hand, dass diese Art des Prüfens einer Schweissverbindung mit Hilfe eines besonderen, auf die Schweissverbindung zu schweissenden Prüfkanals nicht nur umständlich ist, sondern auch weitere Unsicherheitsfaktoren mit sich bringt, denn es kann hier gut vorkommen, dass zwar die Schweissverbindung der beiden Bahnen dicht ist, die Anschweisstellen des den Prüfkanal bildenden Streifens jedoch undicht sind, so dass trotz Druckabfalles des Prüfdruckes die Schweissverbindung der Bahnen selbst in Ordnung sein kann, was aber nicht genau festzustellen ist.



   Um nun auch noch diesen Unsicherheitsfaktor bei der Prüfung einer Schweissverbindung auszuschalten, wird erfindungsgemäss vorgeschlagen. den Kanal aus wenigstens einer, an einer der beiden miteinander verschweissten Bahnen oder Bänder im Bereiche der   Uberlappungsstelle    vorgesehenen, sich über die gesamte Länge hinweg erstreckenden und aus der Bahn oder dem Band selbst geformten   Profürinne    zu bilden.



   Dieser Erfindungsvorschlag, den Prüfkanal aus der Bahn oder dem Band selbst zu bilden ist, hat für die Praxis den entscheidenden Vorteil, dass vor Durchführung des Schweissverbindungsprüfvorganges nicht erst ein besonderer. einen Prüfkanal bildender Streifen aufgeschweisst werden muss, sondern dass jetzt der Prüfkanal an jeder Schweissverbindungsstelle bereits vorhanden ist. Unsicherheiten, wie sie bei der vorbekannten Prüfung auf Dichtheit der Schweissverbindung vorhanden sind, werden hierbei ausgeschaltet. Wenn hier der Prüfdruck konstant bleibt, steht unmissverständlich fest, dass die Schweissverbindung auch dicht ist, während bei Druckabfall ebenso eindeutig feststeht, dass in der Schweissverbindung eine Undichtigkeit vorhanden sein muss.  



   Die Dichtigkeitsprüfung einer Schweissverbindung mit den erfindungsgemäss vorgeschlagenen Mitteln ist sicher und zuverlässig, während die Prüfung mit den vorbekannten Mitteln demgegenüber unzulänglich ist, weil durch das zusätzliche Aufschweissen eines den Prüfkanal bildenden Streifens neue Unsicherheiten bei der Druckprüfung hinzukommen.



   Auf der beiliegenden Zeichnung sind als Ausführungsbeispiel zwei Kunststoffbahnen im Bereiche ihrer Schweissverbindungszone anhand eines Schaubildes wiedergegeben.



   Dabei ist mit 1 die eine Bahn, z. B. die auf der Zeichnung unten liegende Bahn bezeichnet, während die bei der Überlappung beider Bahnen oben liegende Bahn die Bezeichnung 2 führt. Im Bereiche der   Überlappungsstelle    3 sind beide Bahnen 1 und 2 miteinander verschweisst. Die mit 4 bezeichneten Endwülste können als besondere Profile ebenso vorgesehen sein, wie auch mit jeder Bahn eine Baueinheit bilden.



   Wie ersichtlich, ist die Bahn 2 mit Abstand zu ihrer Längsseitenkante unter Bildung einer Rinne 5 von eckigem Querschnitt profiliert ausgebildet, so dass im verschweissten Zustand ein Kanal 6 gebildet wird, der zur Dichtigkeitsprüfung der Schweissverbindung an einem Ende verschlossen wird, während am offenen Ende Druck auf den Kanal 6 gegeben wird. Tritt ein Druckabfall ein, ist die Schweissverbindung undicht, während bei Konstanthaltung des Druckes die Schweissverbindung in Ordnung ist. Mit einfachen aber wirkungsvollen Mitteln kann jetzt die Dichtigkeitsprüfung vorgenommen werden.   



  
 



  Welded connection of two overlapping plastic sheets or strips
The invention relates to a welded connection between two overlapping plastic webs or strips, a longitudinal channel for pressure testing being provided in the overlapping zone.



   As is well known, plastic sheets or tapes are also widely used in practice for sealing purposes in the building trade. If large areas are involved here, the strips or strips must be welded to one another along their longitudinal edges. Depending on the intended use of the webs, overlapped welded connections are produced, as well as welded connections in which the longitudinal edges of the webs to be welded butt against each other. It is extremely important here that the entire weld joint is tight.



   So that one is now also technically able to test the welded connection for leaks, it has become known to provide a test channel within the welding zone, which is practically formed from a plastic strip which z. B. at an overlapped connection near the longitudinal side edge of the one web is welded on this as well as outside this longitudinal side edge on the opposite web. By deforming this test strip about its longitudinal axis, this test strip is arched and in the welded state of this strip thus forms a channel that is closed at one end, while at the opposite open end a pressure medium, e.g. B.



  Compressed air, water or the like. If the pressure remains constant, the welded joint is tight, while a leak is detected if the pressure drops.



   It is obvious that this type of testing of a welded connection with the help of a special test channel to be welded onto the welded connection is not only cumbersome, but also brings with it further uncertainty factors, because it can well happen here that the welded connection of the both tracks is tight, but the welding points of the strip forming the test channel are not tight, so that despite the pressure drop in the test pressure, the welded connection of the tracks itself can be in order, but this cannot be precisely determined.



   In order to also eliminate this uncertainty factor when testing a welded joint, it is proposed according to the invention. to form the channel from at least one profi channel, provided on one of the two welded sheets or strips in the area of the overlap point, extending over the entire length and formed from the sheet or the strip itself.



   This inventive proposal to form the test channel from the web or the strip itself has the decisive advantage in practice that a special test procedure is not carried out before the welded connection test is carried out. a test channel forming strips must be welded, but that now the test channel is already present at each welded joint. Uncertainties, such as those that exist in the previously known test for tightness of the welded joint, are eliminated here. If the test pressure remains constant here, it is unmistakably certain that the welded joint is also tight, while in the event of a pressure drop it is just as clear that there must be a leak in the welded joint.



   The leak test of a welded joint with the means proposed according to the invention is safe and reliable, while the test with the previously known means is inadequate because the additional welding of a strip forming the test channel adds new uncertainties to the pressure test.



   In the accompanying drawing, two plastic webs are shown as an exemplary embodiment in the area of their weld connection zone using a diagram.



   With 1 is the one path, z. B. denotes the web lying at the bottom of the drawing, while the web lying at the top when the two webs overlap is designated 2. In the area of the overlap point 3, both webs 1 and 2 are welded together. The end beads denoted by 4 can also be provided as special profiles and also form a structural unit with each track.



   As can be seen, the web 2 is profiled at a distance from its longitudinal side edge to form a channel 5 of angular cross-section, so that in the welded state a channel 6 is formed which is closed at one end to test the welded connection for leaks, while pressure is applied at the open end is given to channel 6. If there is a pressure drop, the welded joint is leaky, while if the pressure is kept constant, the welded joint is OK. The leak test can now be carried out with simple but effective means.


    

Claims (1)

PATENTANSPRUCH Schweissverbindung zweier einander überlappender Kunststoffbahnen oder -bänder, wobei in der ttberlappung ein Längskanal zur Druckprüfung vorgesehen ist, dadurch gekennzeichnet, dass der Kanal (6) aus wenigstens einer, an einer der beiden miteinander verschweissten Bahnen (1, 2) oder Bänder im Bereiche der Übeflappungsstelle (3) vorgesehenen, sich über die gesamte Länge hinweg erstreckenden und aus der Bahn (2) oder dem Band selbst geformten Profilrinne (5) gebildet ist. PATENT CLAIM Welded connection of two overlapping plastic webs or strips, a longitudinal channel for pressure testing being provided in the overlap, characterized in that the channel (6) consists of at least one web (1, 2) or strips welded to one another on one of the two webs (1, 2) or strips in the area of the Overlapping point (3) provided, extending over the entire length and formed from the web (2) or the tape itself is formed profile channel (5). UNTERANSPRÜCHE 1. Schweissverbindung nach dem Patentanspruch, dadurch gekennzeichnet, dass die Offenseite der Profilrinne (5) dem sie übergreifenden, nicht profilierten Endteil der Gegenbahn (1) zugekehrt ist. SUBCLAIMS 1. Welded connection according to claim, characterized in that the open side of the profile channel (5) faces the non-profiled end part of the mating track (1) that extends over it. 2. Schweissverbindung nach dem Patentanspruch und dem Unteranspruch 1, dadurch gekennzeichnet, dass die Profilrinne (5) eckigen Querschnitt aufweist. 2. Welded connection according to claim and dependent claim 1, characterized in that the profile channel (5) has an angular cross-section.
CH1045963A 1963-04-02 1963-08-21 Welded connection of two overlapping plastic sheets or strips CH420586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0044529 1963-04-02

Publications (1)

Publication Number Publication Date
CH420586A true CH420586A (en) 1966-09-15

Family

ID=7270722

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1045963A CH420586A (en) 1963-04-02 1963-08-21 Welded connection of two overlapping plastic sheets or strips

Country Status (1)

Country Link
CH (1) CH420586A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339476A1 (en) * 1976-01-30 1977-08-26 Sarna Kunststoff Ag Portable thermoplastic film welder not requiring backing - having double film heater plus double pair welding rollers
EP0098322A1 (en) * 1982-07-07 1984-01-18 Bier-Drive Ag Plastic bag
EP0255014A2 (en) * 1986-07-21 1988-02-03 SLT LINING TECHNOLOGY GmbH Process for the continuous overlap-welding of large plastic films or sheets

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2339476A1 (en) * 1976-01-30 1977-08-26 Sarna Kunststoff Ag Portable thermoplastic film welder not requiring backing - having double film heater plus double pair welding rollers
EP0098322A1 (en) * 1982-07-07 1984-01-18 Bier-Drive Ag Plastic bag
EP0255014A2 (en) * 1986-07-21 1988-02-03 SLT LINING TECHNOLOGY GmbH Process for the continuous overlap-welding of large plastic films or sheets
EP0255014A3 (en) * 1986-07-21 1989-05-10 Schlegel Lining Technology Gmbh Process for the continuous overlap-welding of large plastic films or sheets

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