DE1062004B - Method and device for producing a round bottom bag from a piece of tubular film made of thermoplastic material - Google Patents

Method and device for producing a round bottom bag from a piece of tubular film made of thermoplastic material

Info

Publication number
DE1062004B
DE1062004B DEW15274A DEW0015274A DE1062004B DE 1062004 B DE1062004 B DE 1062004B DE W15274 A DEW15274 A DE W15274A DE W0015274 A DEW0015274 A DE W0015274A DE 1062004 B DE1062004 B DE 1062004B
Authority
DE
Germany
Prior art keywords
plate
piece
edge
tubular film
round bottom
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.)
Pending
Application number
DEW15274A
Other languages
German (de)
Inventor
Max Hintz
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.)
Dow Produktions und Vertriebs GmbH and Co oHG
Original Assignee
Wolff and Co AG
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 Wolff and Co AG filed Critical Wolff and Co AG
Priority to DEW15274A priority Critical patent/DE1062004B/en
Publication of DE1062004B publication Critical patent/DE1062004B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B29C66/612—Making circumferential joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint 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
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single 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
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)

Description

Verfahren und Vorrichtung zum Herstellen eines Rundbodenbeutels aus einem Stück Folienschlauch aus thermoplastischem Kunststoff Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung eines Rundbodenbeutels aus einem Stück Folienschlauch aus thermoplastischem Kunststoff, insbesondere Polyäthylen. Es ist bekannt, derartige Beutel dadurch zu erzeugen, daß das entsprechend lang bemessene Schlauchstück: aus Polyäthylen oder sonst einem Thermoplasten an seinem einen Ende über einen Ringkörper nach außen zu einem abstehenden Rand umgebogen und auf diesen ein kreisrundes Bodenblatt aus dem gleichen Kunststoff aufgelegt und damit durch elektrische Erhitzung thermoplastisch verschweißt wird. Method and device for producing a round bottom bag from a piece of film tube made of thermoplastic material The invention relates to a method and an apparatus for producing a round bottom bag from a Piece of film tube made of thermoplastic, in particular polyethylene. It is known to produce such a bag by making it correspondingly long sized piece of hose: made of polyethylene or some other thermoplastic on his one end bent over an annular body outwards to form a protruding edge and placed on top of this a circular base sheet made of the same plastic and is thus welded thermoplastically by means of electrical heating.

Bei einem nach diesem Verfahren hergestellten Rundbodenbeutel ist der Bodenrand nicht nur bei der Handhabung des Beutels, insbesondere des gefüllten Beutels, als von dessen Wandung abstehender Teil hinderlich, sondern er stört auch durch Hervorhebung und Betonung der Schweißnaht den geschlossen einheitlichen Gesamteindruck des Beutels. Außerdem ist zur Bildung dieses Außenrandes des Schlauchstückes und seine Verschweißung mit dem Bodenblatt ein besonders ausgebildeter Spann- und Auflagering für das umgebogene Schlauchstückende erforderlich, was die bauliche Ausbildung des ganzen Schweißgerätes umständlich macht und außerdem die Fertigung des Beutels verlangsamt. Das Herstellungsverfahren wird auch dadurch verzögert, daß die äußeren Ringteile des abstehenden Randes und des daraufliegenden Bodenblattes durch die Schweißhitze zur Verringerung des Maßes des Hinausragens des Randes über die Beutelwandung abgetrennt werden müssen. In the case of a round-bottom bag manufactured using this method the bottom edge not only when handling the bag, especially the filled one Bag, as an obstructive part protruding from its wall, but it also disturbs by highlighting and accentuating the weld seam the closed, uniform overall impression of the bag. In addition, to form this outer edge of the hose piece and its welding with the base sheet a specially designed clamping and support ring required for the bent hose piece end, which the structural design of the makes the whole welding machine cumbersome and also slows down the production of the bag. The manufacturing process is also delayed by removing the outer ring parts the protruding edge and the base sheet lying on it due to the heat of welding separated to reduce the extent of the protrusion of the edge over the bag wall Need to become.

Diese überstände lassen sich auch dadurch nicht vermeiden, daß man, statt das eine Schlauchende nach außen umzubördeln, das kreisrunde Bodenblatt am Rande quer zu seiner Fläche nach innen über einen Ringrahmen umlegt und mit Hilfe eines Preßstempels an das eine Ende des Folienschlauchstückes andrückt und mit diesem dann verschweißt, da auch in diesem Fall ein Entfernen von überschüssigen Randteilen erforderlich ist und das Gerät zur Durchführung des Verfahrens an Einfachheit der Handhabung und Bauart zu wünschen übrig läßt. These overhangs cannot be avoided by instead of flanging one end of the hose outwards, use the circular base sheet on the Edge at right angles to its surface inwardly folded over a ring frame and with the help a ram presses against one end of the tubular film and with this then welded, as in this case too a removal of excess edge parts is required and the device to carry out the procedure in terms of simplicity Handling and design leaves a lot to be desired.

Nach der Erfindung wird nun diesen Mängeln bei der Herstellung eines Rundbodenbeutels aus einem Stück Folienschlauch aus thermoplastischem Kunststoff, insbesondere aus Polyäthylen, und aus einem runden, aus dem gleichen Werkstoff bestehenden und auf den umgelegten Rand des einen Endes des Folienschlauches aufgeschweißten Bodenblatt dadurch abgeholfen, daß das Folienschlauchstück mit dem durch das Bodenblatt zu verschließenden Ende über eine seinen Durchmesser um einige Prozent überschreitende Platte gezogen wird, so daß der über diese überstehende Teil des Schlauchstückes als Auflagerand für das Bodenblatt sich einwärts auf die Platte umlegt, worauf das Aufschweißen des Bodenblattes auf diesen Rand erfolgt. According to the invention, these shortcomings in the manufacture of a Round bottom bag made from a piece of tubular film made of thermoplastic material, in particular made of polyethylene and a round one made of the same material and welded onto the folded edge of one end of the film tube Bottom sheet helped by the fact that the tubular film with the through the bottom sheet to be closed over an end that exceeds its diameter by a few percent Plate is pulled so that the protruding part of the hose piece as a support edge for the base sheet folds inwards on the plate, whereupon the The base sheet is welded onto this edge.

Erfindungsgemäß wird aus einem Folienschlauchstück aus Polyäthylen oder einem ähnlichen Thermoplasten einRundbodenbeutel erhalten, der dieSchweißnaht praktisch nach der Füllung nicht erkennen läßt sowie eine durchweg glatte, von keinem abstehenden Teil unterbrochene Umfläche ähnlich einem aus einem Stück bestehenden Sack aufweist und sich daher auch in gefülltem Zustand bequem handhaben läßt. Ferner ist die Fertigung dieses Rundbodenbeutels vereinfacht und beschleunigt, da dieVerschweißung vonSchlauchstück und Bodenblatt nicht mehr einen Spannring von besonderer Gestaltung und Bedienung verlangt, sondern eine einfache scheibenförmige Isaliberplatte gleichzeitig als Werkzeug zur Bildung des mit dem Bodenblatt zu verbindenden Randes am einen Schlauchstückende und als Unterlage für Rand und Bodenblatt bei der Verschweißung dient und außerdem kein Abtrennen von zu weit überstehenden Bodenblatt- und Randteilen erforderlich ist. According to the invention is made from a piece of tubular film made of polyethylene or a similar thermoplastic, a round bottom pouch can be used to seal the welded seam practically not recognizable after the filling and a consistently smooth one, from none protruding part interrupted surrounding area similar to one consisting of one piece Has sack and can therefore be handled conveniently even when it is full. Further the production of this round bottom bag is simplified and accelerated because the welding The hose section and the base sheet no longer have a clamping ring of special design and operation, but a simple disk-shaped Isaliber plate at the same time as a tool for forming the edge to be connected to the base sheet on one side Hose section end and as a base for the edge and base sheet when welding serves and also no separation of excessively protruding base sheet and edge parts is required.

Eine zur Ausübung des Verfahrens nach der Erfindung geeignete Vorrichtung wird erfindungsgemäß mit einfachen Mitteln dadurch erhalten, daß mit einer runden Platte von etwas größerem Durchmesser als das zu behandelnde Folienschlauchstück ein heb- und senkbares Schweißgerät nach Art eines Druckstempels zusammenarbeitet und der Rand der Platte in der vom Folienschlauchstück beim Überziehen über die Platte einzuhaltenden Richtung nach außen sich konisch erweitert und im anschließenden Verlauf in einer Rundung nach innen in die Auflageebene des Bodenblattes übergeht. A device suitable for carrying out the method according to the invention is obtained according to the invention with simple means that with a round Plate with a slightly larger diameter than the piece of tubular film to be treated a raisable and lowerable welding device works together in the manner of a pressure stamp and the edge of the plate in the from the tubular film when being pulled over the Plate to be observed direction to the outside widens conically and in the subsequent Gradient in a curve inwards into the support plane of the base sheet transforms.

Die Zeichnung veranschaulicht die Vorrichtung zur Durchführung des Verfahrens nach der Erfindung beispielsweise in einer Ausführungsform im Längsschnitt und macht auch das Verfahren näher im einzelnen verständlich. The drawing illustrates the device for performing the Method according to the invention, for example in one embodiment in longitudinal section and also makes the procedure understandable in more detail.

Das aus der Zeichnung ersichtliche Gerät besteht aus einer kreisrunden, schwach konisch ausgebildeten Platte 1. die mittels einer Nabe2 und einer Schraube3 an einer rohrförmigen Stange 4 zentrisch befestigt ist, und aus einem zylindrischen, dem Durchmesser der Platte 1 angepaßten Druckstempel 11, der mittels einer Nabe 12 und einer Schraube 13 mit einer rohrförmigen Stange 14 zentrisch verbunden ist und eine elektrische Heizdrahtschraube 15 enthält. Die beiden Stangen 4 und 14 sind in einem nicht in der Zeichnung wiedergegebenen Gestell gleichachsig geführt, so daß die Platte 1 und der Druckstempel 11 gegeneinander verschiebbar sind. The device shown in the drawing consists of a circular, slightly conical plate 1. which by means of a hub2 and a screw3 is attached centrally to a tubular rod 4, and from a cylindrical, the diameter of the plate 1 adapted pressure stamp 11, which by means of a hub 12 and a screw 13 is centrally connected to a tubular rod 14 and an electric heating wire screw 15. The two rods 4 and 14 are out of the same axis in a frame not shown in the drawing, so that the plate 1 and the plunger 11 are displaceable relative to one another.

Die Platte 1 hat einen um einige, etwa 5010 größeren Außendurchmesser als das auf sie aufzuschiebende Folienschlauchstück 6 aus Polyäthylen, das in einen Rundbodenbeutel umzuformen ist, so daß das Schlauchstück etwas an dem die Platte 1 umschließenden Ende gespannt wird. das dadurch zur Bildung eines Randes 7 veranlaßt wird, sich nach innen auf die an der Platte 1 mit Erhöhung vorgeseheneRingfläche von etwa 10 mm Breite umlegt, während die von der Platte 1 sich nach unten erstreckende Schlauchwand frei herabhängt, so daß in ihr etwa beim Überschieben über die Platte 1 entstehende Spannungen sich ohne weiteres ausgleichen können. Auf den Schlauchstückrand 7 wird nunmehr das dem Schlauchdurchmesser entsprechende kreisrunde Bodenblatt 9 aus Polyäthylen aufgebracht, auf das dann der ähnlich wie die Platte 1 mit einer erhöhten äußeren Ringfläche 18 versehene, gleichzeitig als elektrischer Schweißkopf wirksame Druckstempel 11 gesenkt wird, um das Bodenblatt 9 mit dem Schlauchstückrand 6 thermoplastisch zu verschweißen. The plate 1 has an outer diameter that is a few, about 5010 larger than the tubular film 6 made of polyethylene to be pushed onto it, which is in a Round bottom bag is to be reshaped so that the piece of tubing is somewhat on the plate 1 enclosing end is stretched. which thereby causes an edge 7 to be formed inwards on the annular surface provided on the plate 1 with an elevation of about 10 mm width, while that of the plate 1 extending downwards Hose wall hangs down freely, so that in it about when sliding over the plate 1 resulting tensions can easily be balanced out. On the edge of the hose piece 7 is now the circular base sheet 9 corresponding to the hose diameter Applied from polyethylene, on which then the similar to the plate 1 with a increased outer ring surface 18 provided, at the same time as an electric welding head effective plunger 11 is lowered to the bottom sheet 9 with the edge of the hose piece 6 to be welded thermoplastically.

Nach Wiederanheben des Schweißkopfes 11 kann von der Platte 1 der fertige Rundbodenbeutel 6, 7, 9 aus Polyäthylen abgezogen werden, bei dem die durch den Innenrand7 des Schlauchstückes6 und das Bodenblatt 9 gebildete Schweißnaht praktisch nicht erkennbar ist und der eine einheitliche glatte Umfläche ohne vorstehende Randteile aufweist. After the welding head 11 has been raised again, from the plate 1 the finished round bottom bags 6, 7, 9 be deducted from polyethylene, in which the through the inner edge 7 of the hose piece 6 and the bottom sheet 9 formed weld seam practically is not recognizable and which has a uniform smooth peripheral surface without protruding edge parts having.

PATENTANSPR OCHE : 1. Verfahren zum Herstellen eines Rundbodenbeutels aus einem StückFolienschlauch aus thermoplastischem Kunststoff, insbesondere aus Polyäthylen, durch Aufschweißen eines runden Bodenblattes aus dem gleichen Werkstoff auf den in die Ebene des Bodens umgelegten Rand des einen Endes des Folienschlauches, dadurch geliennzeichnet, daß das Folienschlauchstück (6) mit dein durch das Bodenblatt zu verschließenden Ende über eine runde, seinen Durchmesser um einige Prozent überschreitende Platte (1) gezogen wird, so daß der über diese Platte (1) überstehende Teil des Schlauchstückes (6) als Auflagerand (7) für das Bodenblatt (9) einwärts auf die Platte (1) sich umlegt, worauf das Aufschweißen des Bodenblattes (9) auf jenen Rand (7) erfolgt. PATENT CLAIM: 1. Method for producing a round bottom bag from a piece of tubular film made of thermoplastic material, in particular from Polyethylene, by welding on a round base sheet made of the same material on the edge of one end of the film tube, which is folded over into the plane of the floor, characterized in that the tubular film (6) with your through the bottom sheet to be closed over a round end that exceeds its diameter by a few percent Plate (1) is pulled so that the part of the protruding over this plate (1) Hose piece (6) as a support edge (7) for the bottom sheet (9) inward on the Plate (1) folds over, whereupon the bottom sheet (9) is welded onto that edge (7) takes place.

Claims (1)

2. Vorrichtung zur Ausübung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß mit der Platte (1) eine heb- und senkbare Schweißeinrichtung (11) nach Art eines Druckstempels (11) zusammenwirkt und daß der Rand der Platte (1) in der Richtung, wie das Folienschlauchstück (6) mit der einen Öffnung über die Platte (1) gezogen wird, nach außen sich konisch erweitert und im weiteren Verlauf in einer Rundung nach innen in die Auflageebene des Bodenblattes (9) übergeht. ~~~~~~~ In Betracht gezogene Druckschriften: Zeitschrift »Die neue Verpackung«, Heft 11/1952, S.311; Zeitschrift »Die Verpackungsrundschau«, Heft 11/ 1954, S. 521, 522. 2. Apparatus for performing the method according to claim 1, characterized characterized in that the plate (1) is a liftable and lowerable welding device (11) cooperates in the manner of a pressure stamp (11) and that the edge of the plate (1) in the same direction as the tubular film (6) with one opening over it the plate (1) is pulled, widens conically outwards and in the further course merges in a rounding inward into the support plane of the base sheet (9). ~~~~~~~ Considered publications: magazine »Die neue Verpackung«, issue 11/1952, P.311; Magazine "Die Verpackungsrundschau", issue 11/1954, pp. 521, 522.
DEW15274A 1954-11-10 1954-11-10 Method and device for producing a round bottom bag from a piece of tubular film made of thermoplastic material Pending DE1062004B (en)

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Publication number Priority date Publication date Assignee Title
WO2023046881A1 (en) * 2021-09-24 2023-03-30 Ampack Gmbh Sealing device, sealing station and method for producing such a sealing device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023046881A1 (en) * 2021-09-24 2023-03-30 Ampack Gmbh Sealing device, sealing station and method for producing such a sealing device

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