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EP0189092B1 - Method for making bags of thermoplastic material - Google Patents

Method for making bags of thermoplastic material Download PDF

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Publication number
EP0189092B1
EP0189092B1 EP86100412A EP86100412A EP0189092B1 EP 0189092 B1 EP0189092 B1 EP 0189092B1 EP 86100412 A EP86100412 A EP 86100412A EP 86100412 A EP86100412 A EP 86100412A EP 0189092 B1 EP0189092 B1 EP 0189092B1
Authority
EP
European Patent Office
Prior art keywords
web
tubular
pieces
webs
sections
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
EP86100412A
Other languages
German (de)
French (fr)
Other versions
EP0189092A2 (en
EP0189092A3 (en
Inventor
Fritz Ing. Grad. Achelpohl
Hermann Oelrich
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
Priority to AT86100412T priority Critical patent/ATE58334T1/en
Publication of EP0189092A2 publication Critical patent/EP0189092A2/en
Publication of EP0189092A3 publication Critical patent/EP0189092A3/en
Application granted granted Critical
Publication of EP0189092B1 publication Critical patent/EP0189092B1/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
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B31B70/628—Applying glue on moving webs to form 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
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S493/00—Manufacturing container or tube from paper; or other manufacturing from a sheet or web
    • Y10S493/916—Pliable container
    • Y10S493/933—Pliable container having multilayer wall

Definitions

  • the invention relates to a method for producing sacks from thermoplastic, in which a tubular web is formed from a plastic film web by wrapping in the side parts and gluing their overlapping edge regions by a longitudinal seam, and hose sections are separated from this tubular web, which are welded with bottom weld seams and after Filling with head welding seams.
  • a method for producing sacks from thermoplastic in which a tubular web is formed from a plastic film web by wrapping in the side parts and gluing their overlapping edge regions by a longitudinal seam, and hose sections are separated from this tubular web, which are welded with bottom weld seams and after Filling with head welding seams.
  • the bag tube pieces can be provided with side gussets before the transverse bottom weld seams are attached. If the bags are made of plastic films, there is a risk of damage during loading, transportation and storage because the plastic films forming the bag walls are very susceptible to tearing and the bags are usually subjected to a rough treatment. Damage caused when the sacks are handled can result in filling losses of up to 50%.
  • Sacks are also known which consist of tubular pieces made of a fabric made of stretched plastic tapes. Such bags have a high strength, sa that they are not damaged even with rough treatment and with impacts with pointed objects. Sacks made from plastic tapes have the disadvantage that they are difficult to weld, so that the manufacture of the top and bottom seams presents considerable difficulties.
  • this object is achieved in that web pieces made of a fabric made of stretched plastic tapes, which are shorter than the distance between the later bottom and head weld seams on the flat-lying sacks, are introduced with a mutual distance between two converging plastic film webs, the area of the later bottom - And head welding seams bridged that the webs and the fabric web pieces are laterally offset and the exposed edge strips of the webs and fabric web pieces are provided with hot-melt adhesive coatings, so that during subsequent tube formation they jerk with their opposite edge strips that overlap the hot-melt adhesive coatings, and that from the The tube pieces are cut off approximately in the middle between the fabric sheet pieces and these are provided with the transverse floor weld seams which only capture the plastic tube sheet pieces.
  • the sacks produced by the method according to the invention thus have three-layer walls which are formed by the plastic webs which lie on the inside and outside and which enclose the reinforcing fabric web pieces between them.
  • the composite film forming the sack walls has a high level of tightness and, moreover, also a high level of strength, because the fabric web pieces are largely insensitive to injuries and are insensitive to tears. Since the fabric web pieces lie outside the bottom and head weld seams, these can be easily attached.
  • the main loads on the bags arise in the region of the side walls, which are reinforced by the fabric sheet pieces, so that there is no significant weakening in that the fabric sheet pieces end in front of the bottom and head transverse weld seams which are only passed through the sheet pieces.
  • the bags produced by the process according to the invention withstand high loads after they have been filled and after the head welds have been made. They will not be damaged even if they are handled several times during transport and storage. These sacks are not only insensitive to tears, but also to stitches, because the ribbon fabric inserts have the streaking that they contract again after the penetration of pointed objects.
  • one of these is provided with a plurality of strips of hot-melt adhesive which are parallel and spaced apart.
  • the tape fabric inserts are connected to the relevant film web by means of these hot-melt adhesive strips.
  • the hot-melt adhesives bond the foils surrounding the fabric web pieces to one another, so that these, too, are fixed sufficiently firmly to one another.
  • the length of the fabric web pieces corresponds to the height of the side walls of the filled sacks.
  • This configuration is particularly expedient in the case of large bags with a capacity of 1 to 2 tons, since in these the fabric web pieces form, as it were, the side walls stiffening belly bandages.
  • the bottom and top surfaces provided with the transverse weld seams form stand surfaces with less load in such bags.
  • the double-layer tubular web with the fabric web pieces produced by the method according to the invention can be wound up into transport rolls, from which the individual bag hose pieces are separated before filling.
  • flexible material strips for example made of plastic film, can be placed on the edge regions of the tubular web before winding, which compensate for the height of the seams formed by the overlaps.
  • the webs 3 and 4 are continuously drawn off from the film rolls 1 and 2. Between these two webs 3 and 4, tissue pieces 5 are introduced at a distance from one another, which are cut off in cycles from a web 7 drawn off from a roll 6. 2 shows, the individual layers 3, 4 and 5 are offset from one another. Continuous strips 9 of a hot-melt adhesive are applied via a glue application unit 8, by means of which, on the one hand, the fabric pieces 5 are fixed on the web 4. On the other hand, the upper web 3 is also connected to the lower web in the area Y in which the fabric pieces do not lie against one another. The tube which can be seen in cross section in FIG. 3 is then formed from the three-layer flat web shown in FIG. 2 via a folding device 10. The glue strips 11 required for connection (FIG.
  • hose 13 is then advanced further by the preferred rollers 14 and, if necessary, divided into individual hose sections by a cutting device 15 or wound up into a roll 16 after the cutting device 15 has been shut down.
  • a switch 17 is provided behind the cutting device 15, which is constructed in a known manner.
  • Pieces of hose according to FIG. 4 are then separated from a hose provided with side gussets, the longitudinal seam not being shown in FIG. 4.
  • FIGS. 5 and 6 show that the middle layer 5 is shorter than the other two layers 3 and 4. If only one end of a hose section is shown here, the layer 5 is also set back at the other end compared to the other layers 3 and 4 .
  • the dimension for this offset is denoted by X.
  • a sack formed from such a piece of hose is shown in FIGS. 5 and 6. It can be seen in particular from FIG. 6 that the inner layer 5 made of fabric material is not covered by the welds 18 and 19.
  • the inner layer 5 is, as already indicated in FIG. 4, both ends by that dimension X shorter than the outer fabric layers 4.
  • a sack designed in this way can be welded very well on the one hand and withstands mechanical stresses exceptionally well on the other.
  • Such bags have a capacity of about 25 to 50 kilos. Artificial fertilizers are packaged in them, for example.
  • FIG. 7 shows a large sack with a capacity of 1 to 2 tons.
  • the fabric material 5 only extends over the filling height 20, whereas the material required for the bottom formation as well as the material required for closing the large sack is only formed from two webs 3 and 4 lying one on top of the other.
  • the distance Y denoted in FIG. 2 between two pieces of fabric 5 must therefore be so large during the production of the sack material that the two film webs 3 and 4 protrude a piece of fabric 5 on both ends to such an extent that there is sufficient material for the bottom formation (in FIG. 7) the bottom is already formed) and there is enough material left to add the filled large sack.

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  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A process of manufacturing sacks from synthetic thermoplastic material. A tubular structure is formed from webs of plastic film in that the side portions are infolded and their overlapping margins are adhesively joined by an adhesive seam, tubular sections are severed from the tubular structure and the tubular sections are provided with bottom seam welds and are then filled and provided with top seam welds. The two plastic film webs are moved in unison, and cut sections of oriented plastic material are provided, which cut sections are shorter than the distance between the subsequently formed bottom and top seam welds as measured along the flattened sacks. The cut sections are introduced between the plastic film webs with such a spacing relative to each other that the spaces between the bottom and top seam welds are to be formed. The plastic film webs and the fabric sections are brought together and are laterally offset from each other. The exposed margins of the plastic film webs and of the cut sections are provided with coatings of hot-melt adhesive so that during the subsequent formation of the tubular film the mutually overlapping margins provided with coatings of hot-melt adhesive are adhesively joined. The tubular sections are severed transversely from the tubular film near the centers of the spaces between consecutive cut sections. The transversely extending bottom and top seam welds are formed only between the inner and outer tubular films.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Säcken aus thermoplastischem Kunststoff, bei dem aus einer Kunststofffolienbahn durch Einschlagen der Seitenteile und Verkleben von deren einander überlappenden Randbereichen durch eine Längsnaht eine Schlauchbahn gebildet wird und von dieser Schlauchbahn Schlauchstücke abgetrennt werden, die mit Bodenschweißnähten und nach dem Befüllen mit Kopfschweißnähten versehen werden. Ein solches Verfahren ist bekannt.The invention relates to a method for producing sacks from thermoplastic, in which a tubular web is formed from a plastic film web by wrapping in the side parts and gluing their overlapping edge regions by a longitudinal seam, and hose sections are separated from this tubular web, which are welded with bottom weld seams and after Filling with head welding seams. Such a method is known.

Die Sackschlauchstücke können vor dem Anbringen der quer verlaufenden Bodenschweißnähte mit Seitenfalten versehen sein. Bestehen die Säcke aus Kunststoffolien, so ist während des Verladens, Transportierens und Lagerns die Gefahr von deren Beschädigung gegeben, weil die die Sackwandungen bildenden Kunststoffolien sehr rißempfindlich sind und die Säcke üblicherweise einer rauhen Behandlung ausgesetzt sind. Durch beim Umschlagen der Säcke entstehende Beschädigungen können Füllverluste bis zu 50% auftreten.The bag tube pieces can be provided with side gussets before the transverse bottom weld seams are attached. If the bags are made of plastic films, there is a risk of damage during loading, transportation and storage because the plastic films forming the bag walls are very susceptible to tearing and the bags are usually subjected to a rough treatment. Damage caused when the sacks are handled can result in filling losses of up to 50%.

Weiterhin sind Säcke bekannt, die aus Schlauchstücken aus einem Gewebe aus gereckten Kunststoffbändchen bestehen. Derartige Säcke weisen eine hohe Festigkeit auf, sa daß sie auch bei einer rauhen Behandlung und bei Stößen mit spitzen Gegenständen nicht beschädigt werden. Aus Kunststoffbändchengeweben hergestellte Säcke weisen aber den Nachteil auf, daß sie sich schlecht verschweißen lassen, so daß die Herstellung der Kopf- und Bodennähte erhebliche Schwierigkeiten bereitet.Sacks are also known which consist of tubular pieces made of a fabric made of stretched plastic tapes. Such bags have a high strength, sa that they are not damaged even with rough treatment and with impacts with pointed objects. Sacks made from plastic tapes have the disadvantage that they are difficult to weld, so that the manufacture of the top and bottom seams presents considerable difficulties.

Aufgabe der Erfindung ist es daher, ein Verfahren der eingangs angegebenen Art vorzuschlagen, nach dem sich hochfeste Säcke herstellen lassen, die sich in einfacher Weise mit Boden- und Kopfschweißnähten versehen lassen.The object of the invention is therefore to propose a method of the type mentioned at the outset by which high-strength sacks can be produced which can be provided in a simple manner with bottom and top weld seams.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß zwischen zwei zusammenlaufende Kunststoffolienbahnen Bahnstücke aus einem Gewebe aus gereckten Kunststoffbändchen, die kürzer sind als der Abstand der späteren Boden-und Kopfschweißnähte an den flachliegenden Säcken, mit einem gegenseitigen Abstand eingeführt werden, der den Bereich der späteren Boden- und Kopfschweißnähte überbrückt, daß die Bahnen und die Gewebebahnstücke seitlich versetzt zusammengeführt und die frei liegenden Randstreifen der Bahnen und Gewebebahnstücke mit Heißlebstoffaufträgen versehen werden, so daß sie bei der späteren Schlauchbildung mit ihren jeweils gegenüberliegenden, die Heißklebstoffaufträge überlappenden Randstreifen verkeleben, und daß von der Schlauchbahn etwa mittig zwischen den Gewebebahnstücken die Schlauchstücke abgetrennt und diese mit den nur die Kunststoffschlauchbahnstücke erfassenden querverlaufenden Bodenschweißnähten versehen werden. Die nach dem erfindungsgemäßen Verfahren hergestellten Säcke weisen somit dreilagige Wandungen auf, die durch die außen und innen liegenden Kunststoffbahnen gebildet sind, die zwischen sich die verstärkenden Gewebebahnstücke einfassen. Die die Sackwandungen bildende Verbundfolie weist eine hohe Dichtigkeit und darüber hinaus auch eine hohe Festigkeit auf, weil die Gewebebahnstücke weitgehend unempfindlich gegen Verletzungen und rißunempfindlich sind. Da die Gewebebahnstücke außerhalb der Boden- und Kopfschweißnähte liegen, lassen sich diese problemlos anbringen. Die Hauptbelastungen der Säcke entstehen im Bereich der Seitenwandungen, die durch die Gewebebahnstücke verstärkt sind, so daß eine nennenswerte Schwächung dadurch nicht eintritt, daß die Gewebebahnstücke jeweils vor den nur durch die Folienbahnstücke hindurchgeführten Boden- und Kopfquerschweißnähten enden.According to the invention, this object is achieved in that web pieces made of a fabric made of stretched plastic tapes, which are shorter than the distance between the later bottom and head weld seams on the flat-lying sacks, are introduced with a mutual distance between two converging plastic film webs, the area of the later bottom - And head welding seams bridged that the webs and the fabric web pieces are laterally offset and the exposed edge strips of the webs and fabric web pieces are provided with hot-melt adhesive coatings, so that during subsequent tube formation they jerk with their opposite edge strips that overlap the hot-melt adhesive coatings, and that from the The tube pieces are cut off approximately in the middle between the fabric sheet pieces and these are provided with the transverse floor weld seams which only capture the plastic tube sheet pieces. The sacks produced by the method according to the invention thus have three-layer walls which are formed by the plastic webs which lie on the inside and outside and which enclose the reinforcing fabric web pieces between them. The composite film forming the sack walls has a high level of tightness and, moreover, also a high level of strength, because the fabric web pieces are largely insensitive to injuries and are insensitive to tears. Since the fabric web pieces lie outside the bottom and head weld seams, these can be easily attached. The main loads on the bags arise in the region of the side walls, which are reinforced by the fabric sheet pieces, so that there is no significant weakening in that the fabric sheet pieces end in front of the bottom and head transverse weld seams which are only passed through the sheet pieces.

Die nach dem erfindungsgemäßen Verfahren hergestellten Säcke halten nach ihrer Befüllung und nach dem Anbringen der Kopfschweißnähte hohen Belastungen stand. Sie werden auch bei einem mehrfachen Umschlagen während des Transports und Lagerns nicht beschädigt. Diese Säcke sind nicht nur unempfindlich gegen Risse, sondern auch gegen Stiche, weil die Bändchengewebeeinlagen das Bestrehen haben, sich nach dem Eindringen von spitzen Gegenständen wieder zusammenzuziehen.The bags produced by the process according to the invention withstand high loads after they have been filled and after the head welds have been made. They will not be damaged even if they are handled several times during transport and storage. These sacks are not only insensitive to tears, but also to stitches, because the ribbon fabric inserts have the streaking that they contract again after the penetration of pointed objects.

Zweckmäßigerweise wird vor dem Zusammenlaufen der Kunststofffolienbahnen eine von diesen mit mehreren in Abstand parallel nebeneinanderliegenden Streifen aus Heißklebstoff versehen. Durch diese Heißklebstoffstreifen werden die Bändchengewebeeinlagen mit der betreffenden Folienbahn verbunden. In den Bereichen zwischen den einzelnen Gewebahnstücken verkleben die Heißklebstoffaufträge die die Gewebebahnstücke einfassenden Folien miteinander, so daß auch diese ausreichend fest aneinander fixiert sind.Advantageously, before the plastic film webs converge, one of these is provided with a plurality of strips of hot-melt adhesive which are parallel and spaced apart. The tape fabric inserts are connected to the relevant film web by means of these hot-melt adhesive strips. In the areas between the individual fabric web pieces, the hot-melt adhesive adhesives bond the foils surrounding the fabric web pieces to one another, so that these, too, are fixed sufficiently firmly to one another.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß die Länge der Gewebebahnstücke der Höhe der Seitenwände der gefüllten Säcke entspricht. Diese Ausgestaltung ist insbesondere bei Großsäcken mit einem Fassungsvermögen von 1 bis 2 Tonnen zweckmaßig, da bei diesen die Gewebebahnstücke gleichsam die Seitenwandungen aussteifende Bauchbinden bilden. Die mit den Querschweißnähten versehenen Boden- und Kopfflächen bilden bei derartigen Säcken geringer belastete Standflächen.In a further embodiment of the invention it is provided that the length of the fabric web pieces corresponds to the height of the side walls of the filled sacks. This configuration is particularly expedient in the case of large bags with a capacity of 1 to 2 tons, since in these the fabric web pieces form, as it were, the side walls stiffening belly bandages. The bottom and top surfaces provided with the transverse weld seams form stand surfaces with less load in such bags.

Die nach dem erfindungsgemäßen Verfahren hergestellte doppelagige Schlauchbahn mit den Gewebebahnstücken kann zu Transportrollen aufgewickelt werden, von der vor dem Befüllen die einzelnen Sackschlauchstücke abgetrennt werden. Um im wesentlichen zylindrische Wickel zu erhalten, können auf die Randbereiche der Schlauchbahn vor dem Aufwickeln flexible Materialstreifen, beispielsweise aus Kunststoffolie, aufgelegt werden, die die Höhe der durch die Überlappungen gebildeten Nähte ausgleichen.The double-layer tubular web with the fabric web pieces produced by the method according to the invention can be wound up into transport rolls, from which the individual bag hose pieces are separated before filling. In order to obtain essentially cylindrical windings, flexible material strips, for example made of plastic film, can be placed on the edge regions of the tubular web before winding, which compensate for the height of the seams formed by the overlaps.

Ion die doppellagige mit den Gewebebahnstükken versehene Schlauchbahn können auch zur Herstellung von Seitenfaltensäcken Seitenfalten eingelegt werden. Da die Seitenfalten die Höhe der Längsnähte und Überlappungen ausgleichen, läßt sich eine mit Seitenfalten versehene Schlauchbahn ohne mitgewickelte Streifen zu zylindrischen Rollen aufwickeln.Ion the double-layered tubular web provided with the fabric web pieces can also be used to produce gusseted bags be inserted. Since the gussets compensate for the height of the longitudinal seams and overlaps, a tubular web provided with gussets can be wound up into cylindrical rolls without any coiled strips.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt

  • Fig. 1 die Herstellung eines dreischichtigen Lagenmaterials,
  • Fig. 2 eine Draufsicht in Richtung des Pfeiles II der Fig. 1,
  • Fig. 3 einen Schnitt durch die Bahn gemäß der Linie 111-111 der Fig. 1,
  • Fig. 4 perspektivisch einen aus dem erfindungsgemässen Dreilagenmaterial hergestellten Schlauchabschnitt,
  • Fig. 5 einen gefüllten Sack,
  • Fig. 6 den in Fig. 5 dargestellten Sack gemäß der Linie VI-VI im Schnitt und
  • Fig. 7 einen befüllten Großsack in perspektivischer Darstellung, der noch nicht geschlossen ist.
An embodiment of the invention is explained below with reference to the drawing. In this shows
  • 1 shows the production of a three-layer material,
  • 2 is a plan view in the direction of arrow II of FIG. 1,
  • 3 shows a section through the web along the line 111-111 of FIG. 1,
  • 4 is a perspective view of a hose section made from the three-layer material according to the invention,
  • 5 a filled sack,
  • Fig. 6 shows the sack shown in Fig. 5 along the line VI-VI in section and
  • Fig. 7 shows a filled large bag in perspective, which is not yet closed.

Von den Folienrollen 1 und 2 werden kontinuierlich die Bahnen 3 und 4 abgezogen. Zwischen diese beiden Bahnen 3 und 4 werden mit Abstand zueinander Gewebestücke 5 eingeführt, die von einer von einer Rolle 6 abgezogenen Bahn 7 taktweise abgeschnitten werden. Wie die Fig. 2 zeigt, sind die einzelnen Lagen 3, 4 und 5 gegeneinander versetzt. Über ein Leimauftragsaggregat 8 werden durchgehende Streifen 9 eines Heißschmelzklebers aufgebracht, durch die zum einen die Gewebestücke 5 auf der Bahn 4 fixiert werden. Zum anderen und die oberen Bahn 3 mit der unteren Bahn in dem Bereich Y, in dem die Gewebestücke nicht aneinanderliegen, miteinander ebenfalls verbunden. Aus der in Figur 2 dargestellten dreilagigen Flachbahn wird dann über eine Falteinrichtung 10 der in Figur 3 im Querschnitt zu erkennende Schlauch gebildet. Die zum Verbinden erforderlichen Leimstreifen 11 (Fig. 3) werden durch das Heißschmelzauftragsaggregat 12 aufgebracht. Der Schlauch 13 wird dann durch die Vorzugsrollen 14 weiter vorgezogen und bedarfsweise durch eine Schneideeinrichtung 15 in einzelne Schlauchstücke unterteilt oder aber nach Außerbetriebsetzen der Schneideinrichtung 15 zu einer Rolle 16 aufgewickelt. Zu diesem Zweck ist hinter der Schneideinrichtung 15 eine Weiche 17 vorgesehen, die in bekannter Weise aufgebaut ist. Je nach Verwendungszweck kann es erforderlich sein, hinter den Vorzugsrollen 14 und vor der Weiche 17 eine Seitenfaltenvorrichtung vorzusehen, so daß der Schlauch dann einen Querschnitt aufweist, der aus Fig. 4 ersichtlich ist. Aus einem mit Seitenfalten versehenen Schlauch werden dann Schlauchstücke gemäß Fig. 4 abgetrennt, wobei die Längsnaht in Fig. 4 nicht dargestellt ist.The webs 3 and 4 are continuously drawn off from the film rolls 1 and 2. Between these two webs 3 and 4, tissue pieces 5 are introduced at a distance from one another, which are cut off in cycles from a web 7 drawn off from a roll 6. 2 shows, the individual layers 3, 4 and 5 are offset from one another. Continuous strips 9 of a hot-melt adhesive are applied via a glue application unit 8, by means of which, on the one hand, the fabric pieces 5 are fixed on the web 4. On the other hand, the upper web 3 is also connected to the lower web in the area Y in which the fabric pieces do not lie against one another. The tube which can be seen in cross section in FIG. 3 is then formed from the three-layer flat web shown in FIG. 2 via a folding device 10. The glue strips 11 required for connection (FIG. 3) are applied by the hot melt application unit 12. The hose 13 is then advanced further by the preferred rollers 14 and, if necessary, divided into individual hose sections by a cutting device 15 or wound up into a roll 16 after the cutting device 15 has been shut down. For this purpose, a switch 17 is provided behind the cutting device 15, which is constructed in a known manner. Depending on the intended use, it may be necessary to provide a gusset device behind the preferred rollers 14 and in front of the switch 17, so that the hose then has a cross section which can be seen in FIG. 4. Pieces of hose according to FIG. 4 are then separated from a hose provided with side gussets, the longitudinal seam not being shown in FIG. 4.

Diese Figur 4 zeigt, daß die mittlere Lage 5 kürzer ist als die beiden anderen Lagen 3 und 4. Wenn auch hier nur das eine Ende eines Schlauchabschnittes dargestellt ist, so ist auch am anderen Ende die Lage 5 gegenüber den übrigen Lagen 3 und 4 zurückgesetzt. Das Maß für diesen Versatz ist mit X bezeichnet. Ein aus einem solchen Schlauchstück gebildeter Sack ist in den Fig. 5 und 6 dargestellt. Insbesondere aus der Fig. 6 ist dabei zu erkennen, daß die innere Lage 5 aus Gewebematerial nicht von den Schweißungen 18 und 19 erfaßt ist. Die innere Lage 5 ist nämlich, wie schon in Fig. 4 gekennzeichnet, beidendig um daß Maß X kürzer als die äußeren Gewebelagen 4. Ein so ausgebildeter Sack läßt sich zum einen sehr gut verschweißen und hält zum anderen mechanischen Beanspruchungen außerordentlich gut stand. Derartige Säcke haben ein Fassungsvermögen von etwa 25 bis 50 Kilo. In ihnen wird beispielsweise Kunstdünger verpackt.This Figure 4 shows that the middle layer 5 is shorter than the other two layers 3 and 4. If only one end of a hose section is shown here, the layer 5 is also set back at the other end compared to the other layers 3 and 4 . The dimension for this offset is denoted by X. A sack formed from such a piece of hose is shown in FIGS. 5 and 6. It can be seen in particular from FIG. 6 that the inner layer 5 made of fabric material is not covered by the welds 18 and 19. The inner layer 5 is, as already indicated in FIG. 4, both ends by that dimension X shorter than the outer fabric layers 4. A sack designed in this way can be welded very well on the one hand and withstands mechanical stresses exceptionally well on the other. Such bags have a capacity of about 25 to 50 kilos. Artificial fertilizers are packaged in them, for example.

Die Fig. 7 zeigt im Gegensatz zu Fig. 5 einen Großsack mit einem Fassungsvermögen von 1 bis 2 Tonnen. Bei diesem Sack erstreckt sich das Gewebematerial 5 lediglich über die Einfüllhöhe 20, wohingegen das für die Bodenbildung erforderliche Material ebenso wie das zum Schließen des Großsackes benötigte Material lediglich aus zwei aufeinanderliegenden Bahnen 3 und 4 gebildet ist. Der in Fig. 2 mit Y bezeichnete Abstand zweier Gewebestücke 5 zueinander muß bei der Herstellung des Sackmaterials folglich so groß sein, daß die beiden Folienbahnen 3 und 4 ein Gewebsstück 5 beidendig soweit überragen, daß genügend Material für die Bodenbildung (in Fig. 7 ist der Boden bereits gebildet) und genügend Mateial zum Zulegen des gefüllten Großsakkes verbleibt.In contrast to FIG. 5, FIG. 7 shows a large sack with a capacity of 1 to 2 tons. In this sack, the fabric material 5 only extends over the filling height 20, whereas the material required for the bottom formation as well as the material required for closing the large sack is only formed from two webs 3 and 4 lying one on top of the other. The distance Y denoted in FIG. 2 between two pieces of fabric 5 must therefore be so large during the production of the sack material that the two film webs 3 and 4 protrude a piece of fabric 5 on both ends to such an extent that there is sufficient material for the bottom formation (in FIG. 7) the bottom is already formed) and there is enough material left to add the filled large sack.

Claims (6)

1. A method for the manufacture of bags made of a thermoplastic synthetic material, wherein a tubular web is formed from a web of a synthetic material by the folding in of the side portions and by the bonding of their overlapping edge zones by means of a longitudinal seam and wherein tubular pieces are separated off from this tubular web, which pieces are provided with bottom welds and after filling, with top welds, characterized in that between two converging synthetic sheet webs (3, 4) web pieces (5), consisting of a tissue of small stretched synthetic tapes that are shorter than the distance between the eventual bottom and top welds (18, 19) on the flat laid bags, are introduced with a mutual interspacing bridging the region of the eventual bottom and top welds, in that the webs and the tissue web pieces are brought together with a lateral offset, and in that the exposed edge strips of the webs and tissue web pieces are provided with coatings (11) of a heat-fusible adhesive, so that as the tubular web is being formed they bond together with their respective opposite edge strips which overlap the coatings of the heat fusible adhesive, and in that the web portions are severed from the tubular web approximately centrally between the tissue web pieces and are provided with transverse bottom welds only covering the synthetic tubular web portions.
2. A method according to claim 1, characterized in that before the synthetic webs converge, one of them is provided with several coating strips (8) of a heat fusible adhesive interspaced parallel to each other.
3. A method according to claim 1 or 2, characterized in that the length of the tissue web pieces corresponds to the height of the side walls of the filled bags.
4. A method according to one of claims 1-3, characterized in that the double layered tubular web enclosing the tissue web pieces is wound up into a roll (18) for transport.
5. A method according to claim 4, characterized in that flexible strips of material are placed on the edge zones of the tubular web before it is wound up, which strips equalize the height of the seams formed by the overlaps and the coatings of the heat fusible adhesive.
6. A method according to one of claims 1-4, characterized in that side folds are inserted into the double layered tubular web enclosing the tissue web pieces.
EP86100412A 1985-01-23 1986-01-14 Method for making bags of thermoplastic material Expired - Lifetime EP0189092B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100412T ATE58334T1 (en) 1985-01-23 1986-01-14 PROCESS FOR MAKING BAGS FROM THERMOPLASTIC PLASTIC.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3502151 1985-01-23
DE19853502151 DE3502151A1 (en) 1985-01-23 1985-01-23 METHOD FOR PRODUCING BAGS FROM THERMOPLATIC PLASTIC

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EP0189092A2 EP0189092A2 (en) 1986-07-30
EP0189092A3 EP0189092A3 (en) 1989-01-04
EP0189092B1 true EP0189092B1 (en) 1990-11-14

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US (1) US4726169A (en)
EP (1) EP0189092B1 (en)
AT (1) ATE58334T1 (en)
CA (1) CA1264974C (en)
DE (1) DE3502151A1 (en)

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Also Published As

Publication number Publication date
US4726169A (en) 1988-02-23
DE3502151A1 (en) 1986-07-24
EP0189092A2 (en) 1986-07-30
ATE58334T1 (en) 1990-11-15
CA1264974A (en) 1990-01-30
CA1264974C (en) 1990-01-30
EP0189092A3 (en) 1989-01-04

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