EP0425895B1 - Device for transverse cutting and sealing of webs - Google Patents

Device for transverse cutting and sealing of webs Download PDF

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Publication number
EP0425895B1
EP0425895B1 EP90119907A EP90119907A EP0425895B1 EP 0425895 B1 EP0425895 B1 EP 0425895B1 EP 90119907 A EP90119907 A EP 90119907A EP 90119907 A EP90119907 A EP 90119907A EP 0425895 B1 EP0425895 B1 EP 0425895B1
Authority
EP
European Patent Office
Prior art keywords
web
transverse
bar
length
cutting knife
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 - Lifetime
Application number
EP90119907A
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German (de)
French (fr)
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EP0425895A1 (en
Inventor
Uwe Köhn
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0425895A1 publication Critical patent/EP0425895A1/en
Application granted granted Critical
Publication of EP0425895B1 publication Critical patent/EP0425895B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/645—Making seals transversally to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents

Definitions

  • the invention relates to a device for cross-cutting and cross-welding webs made of thermoplastic material, preferably tubular webs in the manufacture of bags, with a pair of preferred rollers which advance the web clockwise by a length of web section, a preferably heated cross-cutting knife arranged parallel to a cross-welding device and two in parallel Mutually arranged lifting and lowering strips, of which the front in the feed direction as a clamping strip clamps the web end carried between the jaws of the cross-welding device against a base and the strip arranged between the cutting knife and the clamping strip clamps the web clamped between the preferred roller pair and the clamping strip before the cutting knife cuts them.
  • this object is achieved in a device of the generic type in that, after the web has been preferred, the pair of preferred rollers receives a drive movement which retracts the web during a zein interval which lies before the formation of the transverse weld seam. In the device according to the invention, the preferred pair of rollers then executes a slight retraction movement after the web has been advanced, so that the web, which may be folded or loose, is pulled taut.
  • the pair of preferred rollers feeds the web in cycles by a length that is greater than a length of the web section.
  • the retracting movement pulls the excess length back from the pair of preferred rollers, so that the web is pulled smooth.
  • the extent of the retraction movement must be matched to the excess of the preferred length.
  • the web is expediently pulled back after it is clamped by the tensioning strip. If the forward front end of the web is clamped between the tensioning bar and a base, this can be smoothly pulled back by pulling it back.
  • the web is expediently withdrawn by a length which corresponds to the difference between the feed length and the web section length.
  • the retract length can be adjusted according to the desired tension conditions.
  • the tensioning bar can tension the advanced web section already during its retraction or only after the retraction.
  • the cutting knife can already touch the web during its retraction.
  • the pair of preferred rollers consisting of the preferred rollers 1, 2 prefers a plastic tubular web 3 in cycles by one bag length.
  • the plastic tubular web 3 is clamped between them.
  • Blown air nozzles (not shown) can be provided for stretching the front end of the plastic tube web 3. If a sufficiently long piece of tubular web has now been pulled forward by the preferred rollers 1, 2, the hold-down device consisting of the clamping strip 4 lowers onto a counter bearing 5, so that the web is on the one hand between the preferred rollers 1, 2 and on the other hand between the clamping strip 4 and the counter bearing 5 or the stack of bags forming on this is clamped.
  • the tensioning bar 6 moves downward and presses the web 3 downward so strongly that it is tensioned over the groove 7 the counter pressure bar 8 sets.
  • the web 3 is then severed by lowering the upper separating knife holder 9 with the transverse cutting knife 10 attached to it. Approximately simultaneously or immediately thereafter, the bottom seam is formed by the permanently heated welding jaw pair 11.
  • the clamping bar 6 moves into an even further lowered position and thereby presses the bag separated from the web 3 onto the support bar 13 connected to the counter-pressure bar 8.
  • the welding jaws 11 can still be closed and form the transverse weld seam.
  • the support bar 13 has through holes through which needles 12 protrude upward, so that the last bag formed is needled.
  • the needles 12 are firmly connected to the angled profile of the counter bearing 5.
  • the tensioning strip 6 also has bores, so that the individual bags can be pushed onto the needles 12.
  • the indentation 14 under the groove 7 in the counter pressure bar 8 serves for the compression-free storage of the bag edges.
  • the device described here differs from the known one in that the preferred rollers 1, 2 of the preferred roller pair can be turned back by a desired and preferably adjustable amount against the preferred direction of the plastic tubular web 3 indicated by the arrow. This backward rotation of the preferred rollers 1, 2 makes the front web section which was previously carried forward freely Plastic tube sheet 3 smoothed so that it has no folds or is loose.

Description

Die Erfindung betrifft eine Vorrichtung zum Querschneiden und Querschweißen von Bahnen aus thermoplastischem Kunststoff, vorzugsweise von Schlauchbahnen bei der Herstellung von Beuteln, mit einem die Bahn taktweise um eine Bahnabschnittlänge vorziehenden Vorzugsrollenpaar, einem vorzugsweise parallel zu einer Querschweißeinrichtung angeordneten, vorzugsweise beheizten Querschneidmesser und mit zwei parallel zueinander angeordneten heb- und absenkbaren Leisten, von denen die in Vorschubrichtung vordere als Klemmleiste das zwischen den Backen der Querschweißeinrichtung vorgetragene Bahnende gegen eine Unterlage festklemmt und die zwischen dem Schneidmesser und der Klemmleiste angeordnete Leiste als Spannleiste die zwischen dem Vorzugsrollenpaar und der Klemmleiste eingeklemmte Bahn spannt, bevor das Schneidmesser diese durchtrennt.The invention relates to a device for cross-cutting and cross-welding webs made of thermoplastic material, preferably tubular webs in the manufacture of bags, with a pair of preferred rollers which advance the web clockwise by a length of web section, a preferably heated cross-cutting knife arranged parallel to a cross-welding device and two in parallel Mutually arranged lifting and lowering strips, of which the front in the feed direction as a clamping strip clamps the web end carried between the jaws of the cross-welding device against a base and the strip arranged between the cutting knife and the clamping strip clamps the web clamped between the preferred roller pair and the clamping strip before the cutting knife cuts them.

Bei einer aus der DE-OS 32 04 492 bekannten Vorrichtung dieser Art kann es vorkommen, daß der zwischen den Backen der Querschweißeinrichtung und unter dem Schneidmesser vorgeschobene und zwischen dem Vorzugsrollenpaar und der Klemmleiste festgelegte Folienbahnabschnitt so lose liegt, daß er durch Absenken der Klemmleiste nicht in der gewünschten Weise gespannt werden kann.In a device of this type known from DE-OS 32 04 492, it can happen that the film web section which is advanced between the jaws of the cross-welding device and under the cutting knife and is fixed between the pair of preferred rollers and the clamping strip is so loose that it does not fall by lowering the clamping strip can be tensioned in the desired manner.

Wird aber durch Absenken der Klemmleiste keine genügende Spannung erreicht, kann kein Trennschnitt erfolgen, bei dem eine eventuelle Verblockung zwischen den Schnittkanten, die durch das beheizte Trennmesser bewirkt werden kann, mit Sicherheit aufgehoben wird.However, if sufficient tension is not achieved by lowering the terminal strip, a cut cannot be made in which a possible blocking between the cut edges, which can be brought about by the heated cutting knife, is surely removed.

Aufgabe der Erfindung ist es daher, eine Vorrichtung der eingangs angegebenen Art zu schaffen, bei der die Klemmleiste in dem festgeklemmten Bahnabschnitt eine einen guten und eventuelle Verblockungen aufhebenden Trennschnitt gewährleistende Spannung erzeugt.It is therefore an object of the invention to provide a device of the type specified at the outset, in which the clamping strip in the clamped web section generates a tension which ensures a good cutting cut which, if necessary, removes blockages.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der gattungsgemäßen Art dadurch gelöst, daß das Vorzugsrollenpaar nach einem Vorzug der Bahn eine die Bahn zurückziehende Antriebsbewegung während eines Zeintintervalls erhält, der vor dem Bilden der Querschweißnaht liegt. Bei der erfindungsgemäßen Vorrichtung führt somit das Vorzugsrollenpaar nach einem Vorzug der Bahn eine geringfügige Rückzugsbewegung aus, so daß die eventuell in Falten oder lose liegende Bahn straff gezogen wird.According to the invention, this object is achieved in a device of the generic type in that, after the web has been preferred, the pair of preferred rollers receives a drive movement which retracts the web during a zein interval which lies before the formation of the transverse weld seam. In the device according to the invention, the preferred pair of rollers then executes a slight retraction movement after the web has been advanced, so that the web, which may be folded or loose, is pulled taut.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß das Vorzugsrollenpaar die Bahn taktweise um eine Länge vorschiebt, die größer ist als eine Bahnabschnittlänge. Durch die Rückzugsbewegung wird von dem Vorzugsrollenpaar die Überlänge wieder zurückgezogen, so daß die Bahn glattgezogen wird. Dabei ist das Maß der Rückzugsbewegung entsprechend auf das Übermaß der Vorzugslänge abzustimmen.In a further embodiment of the invention it is provided that the pair of preferred rollers feeds the web in cycles by a length that is greater than a length of the web section. The retracting movement pulls the excess length back from the pair of preferred rollers, so that the web is pulled smooth. The extent of the retraction movement must be matched to the excess of the preferred length.

Zweckmäßigerweise erfolgt das Zurückziehen der Bahn nach deren Festklemmen durch die Spannleiste. Ist das vorgeschobene vordere Ende der Bahn zwischen der Spannleiste und einer Unterlage festgeklemmt, kann diese durch ein Zurückziehen in einwandfreier Weise glattgezogen werden.The web is expediently pulled back after it is clamped by the tensioning strip. If the forward front end of the web is clamped between the tensioning bar and a base, this can be smoothly pulled back by pulling it back.

Zweckmäßigerweise wird die Bahn um eine Länge zurückgezogen, die der Differenz zwischen der Vorschublänge und der Bahnabschnittlänge entspricht. Die Rückzugslänge kann entsprechend den gewünschten Spannungsverhältnissen angepaßt werden.The web is expediently withdrawn by a length which corresponds to the difference between the feed length and the web section length. The retract length can be adjusted according to the desired tension conditions.

Die Spannleiste kann den vorgeschobenen Bahnabschnitt schon während ihres Rückzuges oder aber auch erst nach dem Rückzug spannen.The tensioning bar can tension the advanced web section already during its retraction or only after the retraction.

Weiterhin kann auch das Schneidmesser die Bahn bereits während ihres Rückzuges berühren.Furthermore, the cutting knife can already touch the web during its retraction.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung, in deren einziger Figur ein schematischer Querschnitt durch eine Querschweiß- und Querschneideinrichtung dargestellt ist, näher erläutert.An embodiment of the invention is explained in more detail below with reference to the drawing, in the single figure of which a schematic cross section through a cross-welding and cross-cutting device is shown.

Bei der in der Zeichnung dargestellten Vorrichtung zur Herstellung von Kunststoffbeuteln zieht das aus den Vorzugswalzen 1,2 bestehende Vorzugswalzenpaar eine Kunststoffschlauchbahn 3 taktweise jeweils um eine Beutellänge vor. Während der Stillstände der Vorzugswalzen 1,2 ist die Kunststoffschlauchbahn 3 zwischen diesen festgeklemmt. Zum gestreckten Vortragen des vorderen Bahnendes der Kunststoffschlauchbahn 3 können nicht dargestellte Blasluftdüsen vorgesehen sein. Ist nun durch die Vorzugsrollen 1,2 ein genügend langes Schlauchbahnstück vorgezogen worden, senkt sich der aus der Klemmleiste 4 bestehende Niederhalter auf ein Gegenlager 5 ab, so daß die Bahn einerseits zwischen den Vorzugswalzen 1,2 und andererseits zwischen der Klemmleiste 4 und dem Gegenlager 5 bzw. dem sich auf diesen bildenden Beutelstapel festgeklemmt ist. Anschließend fährt die Spannleiste 6 nach unten und drückt dabei die Bahn 3 so stark nach unten, daß sich diese mit Spannung über die Nut 7 der Gegendruckleiste 8 legt. Die Bahn 3 wird sodann durch Herunterfahren des oberen Trennmesserhalters 9 mit dem an diesem befestigten Querschneidmesser 10 durchtrennt. Etwa gleichzeitig bzw. unmittelbar anschließend wird durch das dauerbeheizte Schweißbackenpaar 11 die Bodennaht gebildet.In the device for producing plastic bags shown in the drawing, the pair of preferred rollers consisting of the preferred rollers 1, 2 prefers a plastic tubular web 3 in cycles by one bag length. During the standstill of the preferred rollers 1, 2, the plastic tubular web 3 is clamped between them. Blown air nozzles (not shown) can be provided for stretching the front end of the plastic tube web 3. If a sufficiently long piece of tubular web has now been pulled forward by the preferred rollers 1, 2, the hold-down device consisting of the clamping strip 4 lowers onto a counter bearing 5, so that the web is on the one hand between the preferred rollers 1, 2 and on the other hand between the clamping strip 4 and the counter bearing 5 or the stack of bags forming on this is clamped. Then the tensioning bar 6 moves downward and presses the web 3 downward so strongly that it is tensioned over the groove 7 the counter pressure bar 8 sets. The web 3 is then severed by lowering the upper separating knife holder 9 with the transverse cutting knife 10 attached to it. Approximately simultaneously or immediately thereafter, the bottom seam is formed by the permanently heated welding jaw pair 11.

Unmittelbar nach dem Schnitt fährt die Spannleiste 6 in eine noch weiter abgesenkte Lage und drückt dabei den von der Bahn 3 abgetrennten Beutel auf die mit der Gegendruckleiste 8 verbundene Auflageleiste 13. Während dieses Arbeitsschrittes können die Schweißbacken 11 noch geschlossen sein und die Querschweißnaht bilden. Die Auflageleiste 13 weist Durchgangsbohrungen auf, durch die Nadeln 12 nach oben hervorragen, so daß der jeweils zuletzt gebildete Beutel aufgenadelt wird. Die Nadeln 12 sind fest mit dem abgewinkelten Profil des Gegenlagers 5 verbunden.Immediately after the cut, the clamping bar 6 moves into an even further lowered position and thereby presses the bag separated from the web 3 onto the support bar 13 connected to the counter-pressure bar 8. During this working step, the welding jaws 11 can still be closed and form the transverse weld seam. The support bar 13 has through holes through which needles 12 protrude upward, so that the last bag formed is needled. The needles 12 are firmly connected to the angled profile of the counter bearing 5.

Auch die Spannleiste 6 weist Bohrungen auf, so daß die einzelnen Beutel auf die Nadeln 12 aufgeschoben werden können. Die Einbuchtung 14 unter der Nut 7 in der Gegendruckleiste 8 dient der stauchungsfreien Ablage der Beutelkanten.The tensioning strip 6 also has bores, so that the individual bags can be pushed onto the needles 12. The indentation 14 under the groove 7 in the counter pressure bar 8 serves for the compression-free storage of the bag edges.

Die anhand der Zeichnung beschriebene Vorrichtung entspricht im wesentlichen der in der DE-OS 32 04 492 beschriebenen Vorrichtung, so daß auf diese zur weiteren Darstellung verwiesen werden kann.The device described with reference to the drawing corresponds essentially to the device described in DE-OS 32 04 492, so that reference can be made to this for further illustration.

Die hier beschriebene Vorrichtung weicht jedoch von der vorbekannten insofern ab, als die Vorzugsrollen 1,2 des Vorzugsrollenpaares entgegen der durch den Pfeil angedeuteten Vorzugsrichtung der Kunststoffschlauchbahn 3 um ein gewünschtes und vorzugsweise einstellbares Maß zurückgedreht werden können. Durch diese Rückdrehung der Vorzugsrollen 1,2 wird der zuvor frei vorgetragene vordere Bahnabschnitt der Kunststoffschlauchbahn 3 glattgezogen, so daß er weder Falten aufweist noch lose liegt.However, the device described here differs from the known one in that the preferred rollers 1, 2 of the preferred roller pair can be turned back by a desired and preferably adjustable amount against the preferred direction of the plastic tubular web 3 indicated by the arrow. This backward rotation of the preferred rollers 1, 2 makes the front web section which was previously carried forward freely Plastic tube sheet 3 smoothed so that it has no folds or is loose.

Claims (6)

  1. Device for the transverse cutting of webs of thermoplastic material, preferably of tubular webs in the production of bags, having a pair of forward-drawing rollers (1, 2), drawing the web (3) forwards periodically by a web section length; a transverse-sealing cutting device with a transverse sealing device (11) and a transverse cutting knife (10), the preferably heated transverse cutting knife being arranged preferably parallel to the transverse sealing device, and having two raisable and lowerable bars (4, 6) which are arranged parallel to each other and of which the front bar, in the pushing-forward direction, as clamping bar (4) firmly clamps the end of the web brought forward between the jaws of the transverse sealing cutting device against an underlay (5), and of which the other bar, arranged between the transverse cutting knife and the clamping bar, as tensioning bar (6) tensions the web section clamped in between the pair of forward-drawing rollers and the clamping bar before the transverse cutting knife cuts through the web; characterised in that, after a drawing forward of the web (3), a driving movement drawing the web back is imparted to the pair of forward-drawing rollers (1, 2) during a time interval which lies before the forming of the transverse sealing seam.
  2. Device according to Claim 1, characterised in that the pair of forward-drawing rollers pushes the web (3) forwards periodically by a length which is greater than a web section length to be cut off.
  3. Device according to Claim 1 or 2, characterised in that the drawing-back driving movement takes place after the clamping firm of the web (3) by the clamping bar (4).
  4. Device according to one of Claims 1 to 3, characterised in that the web (3) is drawn back by a length which corresponds to the difference between the drawing-forward length and the web section length to be cut off.
  5. Device according to one of Claims 1 to 4, characterised in that the tensioning bar (6) tensions the web (3) during its drawing back or after drawing back.
  6. Device according to one of Claims 1 to 5, characterised in that the transverse cutting knife (10) is already touching the web (3) during its drawing back.
EP90119907A 1989-11-02 1990-10-17 Device for transverse cutting and sealing of webs Expired - Lifetime EP0425895B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936515 1989-11-02
DE3936515A DE3936515A1 (en) 1989-11-02 1989-11-02 DEVICE FOR CROSS-CUTTING AND CROSS-WELDING RAILWAYS

Publications (2)

Publication Number Publication Date
EP0425895A1 EP0425895A1 (en) 1991-05-08
EP0425895B1 true EP0425895B1 (en) 1993-06-09

Family

ID=6392740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119907A Expired - Lifetime EP0425895B1 (en) 1989-11-02 1990-10-17 Device for transverse cutting and sealing of webs

Country Status (5)

Country Link
US (1) US5112289A (en)
EP (1) EP0425895B1 (en)
CA (1) CA2029307A1 (en)
DE (2) DE3936515A1 (en)
ES (1) ES2045713T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029440A1 (en) * 1990-09-17 1992-03-19 Windmoeller & Hoelscher METHOD FOR PRODUCING PLASTIC BAGS
EP0693424B1 (en) * 1994-07-19 1996-03-27 Fabriques De Tabac Reunies S.A. Label preparation device/method
US5942076A (en) * 1997-03-13 1999-08-24 Sealed Air Corporation Inflatable cushion forming machine
DE19728371C1 (en) * 1997-07-03 1999-01-14 Lemo Maschb Gmbh Device for cross-welding separation and stack-wise collecting and blocking of bags made of a plastic film web, in particular shirt-carrying bags
NL1011809C2 (en) * 1999-04-15 2000-10-17 Cps Case Packaging Sales Europ Device for manufacturing cushions filled with a gaseous medium.
CN106113584A (en) * 2016-08-26 2016-11-16 东莞市骥发自动化设备有限公司 A kind of cutter for bag
CN110102928B (en) * 2019-06-05 2019-12-17 广州市元晟自动化科技有限公司 Control system and method for simplified teaching of double-gun welding of fan impeller

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1278323B (en) * 1961-05-04 1968-09-19 Hesser Ag Maschf Device for the production of soft bags and their transfer to a bag filling and closing machine
FR1485253A (en) * 1966-06-30 1967-06-16 Method and installation for manufacturing sachets from polyethylene sheets or the like
BE789622A (en) * 1971-11-12 1973-02-01 Fmc Corp PROCESS AND APPARATUS FOR MANUFACTURING BAGS OF THERMOPLASTIC MATERIAL WELDED TO THEIR LOWER END
US4101369A (en) * 1972-03-31 1978-07-18 G. T. Schjeldahl Company Bottom seal cut-off
IL47384A0 (en) * 1974-06-21 1975-07-28 Packaging Ind Inc Web handling apparatus
DE2755860C2 (en) * 1977-12-15 1979-09-20 Stiegler, Karl-Heinz, 7000 Stuttgart Machine for producing weld seams on a thermoplastic film web
DE3204492A1 (en) * 1982-01-25 1983-08-18 Windmöller & Hölscher, 4540 Lengerich DEVICE FOR CROSS-SHAPING TRACKS
US5094656A (en) * 1988-11-10 1992-03-10 Fmc Corporation Servo drive bag machine

Also Published As

Publication number Publication date
US5112289A (en) 1992-05-12
DE3936515A1 (en) 1991-05-08
ES2045713T3 (en) 1994-01-16
EP0425895A1 (en) 1991-05-08
CA2029307A1 (en) 1991-05-08
DE59001699D1 (en) 1993-07-15

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