EP0432114A1 - Sac de bandes thermoplastiques avec ficelles annulaires - Google Patents

Sac de bandes thermoplastiques avec ficelles annulaires Download PDF

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Publication number
EP0432114A1
EP0432114A1 EP90830566A EP90830566A EP0432114A1 EP 0432114 A1 EP0432114 A1 EP 0432114A1 EP 90830566 A EP90830566 A EP 90830566A EP 90830566 A EP90830566 A EP 90830566A EP 0432114 A1 EP0432114 A1 EP 0432114A1
Authority
EP
European Patent Office
Prior art keywords
welding
filiform elements
cutting
order
film
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.)
Withdrawn
Application number
EP90830566A
Other languages
German (de)
English (en)
Inventor
Enrico Attucci
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.)
Individual
Original Assignee
Individual
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
Priority claimed from IT01176689U external-priority patent/IT219298Z2/it
Priority claimed from IT9579A external-priority patent/IT1236092B/it
Priority claimed from IT01176789U external-priority patent/IT219299Z2/it
Application filed by Individual filed Critical Individual
Publication of EP0432114A1 publication Critical patent/EP0432114A1/fr
Withdrawn legal-status Critical Current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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8134—Applying strings; Making string-closed bags
    • B31B70/8135—Applying strings; Making string-closed bags the strings being applied in the machine direction
    • 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 aim of the invention is to accelerate the production, to simplify the devices and to reduce the quality requirements of the materials (and the associated costs) in the production of bags made of thermoplastic film comprising at least one housing for a string, usually annular, which slides in the housing and extends out of it, with supply of film which is separated by means of transverse welds and transverse cuts, and with supply of filiform elements for forming the strings.
  • the filiform elements are thermoplastic and heat-sealing and are welded and cut by the operation of thermoplastification.
  • the filiform elements can be of tape type, and are then guided to draw near to one another for the welding.
  • the film material of the bag is removed.
  • the invention also relates to a device for producing bags as defined and by means of the above method.
  • Existing devices for such production comprise means of advance of a film of continuous thermoplastic material, means for welding folded longitudinal lips of said film to form slots or sheatths also the mouth of the bags to be produced, means for supplying continuous filiform elements which are housed in said slots, transverse welding and cutting means for the band-shaped film for the formation of the bags without welding and without cutting the filiform elements, means for separating from one another the bags formed, as well as means for cutting the filiform elements and forming annular strings with these.
  • the device comprises means for excluding the filiform elements from the action of the transverse welding and cutting means, and it also comprises means of welding and of cutting between pairs of contiguous filiform elements in order to form the annular strings.
  • said means for excluding the filiform elements from the action of the transverse welding and cutting means can comprise, for said filiform elements, tubular string-guides which extend in the station for transverse welding and cutting for the formation of the bags, and the means of welding and cutting are bars which have indentations in the area of the tubular string-guides.
  • the profiles of the indentations of the welding bars advantageously interact with the external surfaces of the tubular string-guides in order to cut into the film so as to cause or at least favour separation between the bags.
  • the tubular string-guides can be carried in a cantilevered manner in the area of the welding means for forming, with longitudinal welds, said slots, and by way of a pair of feed cylinders to the station for transverse welding and cutting; moreover, at least one of said cylinders has annular indentations in the area of said tubular string-guides.
  • said means for excluding the filiform elements from the action of the transverse welding and cutting means can comprise, in the welding and cutting bars, indentations in the area of the filiform elements, and, in a position in front of the supply of the filiform elements, means for punching and removing material in regions which, in the station for transverse welding and cutting, come to correspond to said indentations.
  • the means of welding and of cutting for the continuous filiform elements comprise in practice members which draw near to one another in order to press the filiform elements, in order to plastify them so as to weld them to one another and in order to cut them in an intermediate position between two welding regions.
  • a further subject of the invention is a bag-type manufacture with two slots around the access mouth for annular strings which slide therein for closure, made by means of the method and the device as defined above.
  • the drawing illustrates schematically a non-limitative exemplary embodiment of the invention.
  • Figs 1 and 2 show a diagram in plan view and in longitudinal cross-section of a device which comprises the invention
  • Figs 3, 4, 5, 6, 7 and 8 show schematically local transverse cross-sections according to III-III, IV-IV, V-V, VI-VI, VII-VII, and VIII-VIII in Fig. 1, and
  • Figs 9 and 10 show an alternative embodiment with respect to Figs 1 to 7, Fig. 10 being a cross-section according to X-X in Fig. 9,
  • Fig. 11 shows in perspective a possible form of bag which can be made according to the invention
  • Figs 12 and 13 show a cross-section according to XII-XII in Fig. 11 and a local view according to XIII-XIII also in Fig. 11, and
  • Figs 14 and 15 show alternative embodiments of the bag.
  • a film of thermoplastic material which is indicated by P and is presented to the device to be described with a fold M along the longitudinal center line and with two folds in order to have the two longitudinal terminal edges L folded onto the film material on the inside (as shown in the drawing) or on the outside, is supplied according to the arrow f1.
  • the film P is drawn moreover by a pair of cylinders 3 and 5 which make the material advance according to the arrow f1 at a linear speed Vo which is continuous on average or with intermittent advances and with possible cyclical recovery.
  • means, indicated by 7A, 7B are provided, which weld each of the edges L to the contiguous part of the film P adjacent to it so as to form two pairs of slots parallel to the longitudinal lines of folding; these slots are adjacent to the lines of folding Lo of the edges L with respect to the double layer of the film P.
  • the means of welding 7A and 7B can be of sliding type or of rolling type and each of these has a part supported by a structure 9 which penetrates into the cavity delimited by the fold M of the film of thermoplastic material P, in the drawing between the two edges L folded towards the inside (see in particular Fig.
  • the external parts of the means of welding 7A and 7B can be mobile for moving together and apart reciprocally, but during functioning, with the advance according to the arrow f1 of the film P, these means of welding 7A and 7B are in operation in order to ensure the formation of longitudinal welds SA and SB which define the two longitudinal slots GA and GB which are adjacent to the folds Lo of the edges L.
  • the means of welding 7A, 7B can also be of hot-air type, or of the type which uses adhesive or of any other suitable type.
  • Continuous filiform elements such as those EA and EB, which are supplied during the advance according to f1 of the film P, are received in the slots GA and GB; the filiform elements are made to penetrate into the internal space of the film folded along the line M when the edges L are folded towards the inside. Said elements are guided expediently between the film and each of the edges in order to be brought into a position corresponding to the region of formation of the slots GA and GB and precisely in order to be received in precisely these slots.
  • transverse welding means such as transverse welding and cutting bars 11, hot-air or other means, which cut and weld the material in order to create a plurality of packaging bags C of conventional type, to be fastened at the mouth delimited by the folding lines Lo.
  • transverse welding bars 11 are situated immediately downstream of the feed cylinders 3 and 5.
  • the transverse welding and cutting lines are indicated by D in the drawing.
  • the filiform elements EA and EB have to be free to slide in the slots GA and GB and therefore must not be affected by the welds D and even less by the cuts along the welding lines D; in current solutions, this is brought about by avoiding the sticking of the material of the film P in the region of heat-sealing by selecting a suitable material, of which each filiform element EA and EB is formed, the filiform elements being made in particular of cotton or other material.
  • the system has a further pair of feed cylinders 13 and 15, developed at least in the region of the edges L and of suitable type, for example one knurled and the other smooth and rubberized, and/or made in the manner of rollers or other.
  • These cylinders act on the material of the film P with an advance speed V1 which is greater than the advance speed Vo of the cylinders 3 and 5;
  • these cylinders 13 and 15 act downstream of the transverse welding and cutting bars 11, as a result of which the single segments C, which constitute the bag-type packagings delimited by the welding and cutting lines D, are separated from one another precisely because of the greater speed V1 imposed by the pair of feed cylinders 13 and 15, in such a manner that the single pieces of the bag-type packagings C are detached from one another, while the filiform elements EA and EB remain integral and with respect to these slide through the slots GA and GB as a result of the accelerated advance of the bag-type packagings C.
  • filiform elements In conventional solutions, filiform elements must be used which, by the very nature of their constitution are not subject to adhesion with the material which is plastified for the formation of the transverse welds and for the cutting along the welding and separation lines D, and this material is relatively very expensive because it is usually cotton-based; moreover, for the formation of the annular strings, a relatively very complex and therefore slow mechanism is necessary for the cutting and the fastening of the lengths which are situated in the slots GA, or GB respectively, which flank one another, in order to form the annular strings themselves.
  • linear filiform elements EA and EB elements made of thermoplastic material which are capable of being welded by thermal plastification; this entails on the one hand the possibility of using material which is not very expensive, and on the other, cutting and welding the ends of the filiform elements, which have been drawn near to one another, avoiding the expensive and slow means of fastening which are instead adopted with the cotton-based material of the prior art.
  • tubular string-guides 18 are supported by a structure 20 inside the edges L which are folded onto the inside of the film P (or a structure outside said edges, when these are folded towards the outside) in order to bring about in any case a continuous supply of the filiform elements made of thermoplastic material to said tubiform string-guides 18 upstream of the welding members 7A and 7B which form the welds SA and SB and therefore the slots GA and GB.
  • the tubes 18 are supported in a cantilevered manner by the structure 20 or by the external structures, and they extend between the drawing and feed cylinders 3 and 5 which, in a manner corresponding to the tubes 18, have annular grooves 3X and 5X respectively, so as to ensure the space for the tubes 18 themselves, which are side by side and contained in the slots GA and GB formed by the welding members 7A and 7B.
  • the tubes extend as far as the region of the welding bars 11 and these latter (see also Fig. 7) have indented profiles, as indicated by 11X, in order to avoid the bulk of the tubes 18 which reach the region of welding of said bars 11.
  • a modified embodiment of the invention is envisaged.
  • more or less indented profiles 111X in the blades 111, in the area of the filiform elements EA and EB, are envisaged, as well as a removal in advance of the film of material P in the regions which correspond to the intersection between the filiform elements EA and EB and the blades 111.
  • a punching system 140 is provided, of which two punching tools 142A, 142B form part, which are in alignment with the positions corresponding to the slots GA and GB and to the filiform elements EA and EB.
  • These punching tools remove the material of the film in precisely the regions AM which during the advance come to correspond to the intersections between the bars 111 and the slots GA and GB.
  • the removals are of a size which is preferably at least equal to the extent of the indentations 111X, in such a way that in any case the separation between the successive bags is possible in the advance beyond the bars 111.
  • the punchings AM can have a square, oval or circular shape, not least for aesthetic requirements.
  • thermoplastic film material due to the punchings, ensures that the welding of the film P to the filiform elements EA and EB is avoided.
  • FIG. 11 to 13 clearly illustrate, the bag C, which has been made by means of the process indicated above and which, in conventional manner, has lateral welds D and pairs of slots GA and GB delimited by welding lines SA and SB, which are parallel and contiguous with the access mouth BA of the bag of the packaging C.
  • the slots GA, GA receive the annular string EA and the slots GB, GB receive the annular string EB; said annular strings EA and EB are slidable in the respective slots in order to make possible, by means of pulling one of the strings in one direction and the other in the opposite direction, the closure of the access mouth BA and the possible stabilization of the closed state by means of a fastening of the annular strings.
  • the bag has the strings EA and EB made of filiform thermoplastic material and possibly and advantageously in the form of a filament, that is to say of a band, and each annular string is constituted by two lengths of this filiform material, which are welded to one another in the area of the two ends EX and EY, precisely so as to create the annular string without having to have recourse to a fastening which is expensive because it is complex and slow in industrial production.
  • Figs 14 and 15 two bags of different form are shown, which can be made according to the invention.
  • the body 201 or 301 of the bag has on its two faces a slot 203 or 303 adjacent to the access mouth 201A or 301A; an annular string 205 or 305, formed by two lengths welded to one another at the ends 205A or 305A, can slide in the slots; in the solution in fig. 15, one of the welding ends 305A is also engaged on the corresponding ends of the slot, being slidable therein; in the solution in Fig. 14, the string is free to slide in the slots.
  • the bag 201 or 301 has a hole 207 or 307 in the vicinity of one of the corners most distant from the slot 203 or 303, in which hole the string 205 or 305 can be engaged by means of a knot in order to constitute a convenient shoulder-strap or handle.
  • the hole 207 or 307 can be suitably reinforced.
  • the drawing shows only an exemplary embodiment of the invention which can vary in form and arrangement.

Landscapes

  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
EP90830566A 1989-12-06 1990-12-05 Sac de bandes thermoplastiques avec ficelles annulaires Withdrawn EP0432114A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
IT1176789U 1989-12-06
IT01176689U IT219298Z2 (it) 1989-12-06 1989-12-06 Confezione a sacchetto in pellicola termoplastica con due guaine affiancate e lacci anulari in esse scorrevoli per la chiusura.
IT1176689U 1989-12-06
IT9579A IT1236092B (it) 1989-12-06 1989-12-06 Metodo ed attrezzatura per produzione di sacchetti di pellicola termoplastica con lacci anulari per la chiusura, e manufatti cosi' realizzati
IT01176789U IT219299Z2 (it) 1989-12-06 1989-12-06 Sacca in pellicola termoplastica con laccio anulare atto a chiudere la sacca e formare spallaccio od impugnatura.
IT957989 1989-12-06

Publications (1)

Publication Number Publication Date
EP0432114A1 true EP0432114A1 (fr) 1991-06-12

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ID=27272747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830566A Withdrawn EP0432114A1 (fr) 1989-12-06 1990-12-05 Sac de bandes thermoplastiques avec ficelles annulaires

Country Status (2)

Country Link
EP (1) EP0432114A1 (fr)
JP (1) JPH0655673A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015173340A1 (fr) * 2014-05-15 2015-11-19 S2F Flexico Machine et methode de formage-remplissage-scellage pour sachet a ruban

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7024298B2 (ja) * 2017-10-04 2022-02-24 シブヤパッケージングシステム株式会社 巾着袋の製造装置および製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777491A (en) * 1954-10-13 1957-01-15 Bemis Bro Bag Co Manufacture of draw-cord bags and the product thereof
US3058403A (en) * 1959-12-10 1962-10-16 Kugler Emanuel Method and apparatus for the manufacture of draw string bags
US3283994A (en) * 1965-04-19 1966-11-08 Bemis Co Inc Bag
DE1778734A1 (de) * 1968-05-29 1972-02-03 Gottlieb Wiedmann Kg Maschinen Verfahren und Vorrichtung zum maschinellen Herstellen von Schliesszugbeuteln
FR2291025A1 (fr) * 1974-11-13 1976-06-11 Janowski Valery Procede et dispositif pour la fabrication de sacs plastiques a fermeture par cordonnets, et sacs ainsi obtenus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777491A (en) * 1954-10-13 1957-01-15 Bemis Bro Bag Co Manufacture of draw-cord bags and the product thereof
US3058403A (en) * 1959-12-10 1962-10-16 Kugler Emanuel Method and apparatus for the manufacture of draw string bags
US3283994A (en) * 1965-04-19 1966-11-08 Bemis Co Inc Bag
DE1778734A1 (de) * 1968-05-29 1972-02-03 Gottlieb Wiedmann Kg Maschinen Verfahren und Vorrichtung zum maschinellen Herstellen von Schliesszugbeuteln
FR2291025A1 (fr) * 1974-11-13 1976-06-11 Janowski Valery Procede et dispositif pour la fabrication de sacs plastiques a fermeture par cordonnets, et sacs ainsi obtenus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015173340A1 (fr) * 2014-05-15 2015-11-19 S2F Flexico Machine et methode de formage-remplissage-scellage pour sachet a ruban
FR3021034A1 (fr) * 2014-05-15 2015-11-20 S2F Flexico Machine de formage-remplissage-scellage pour sachet a ruban
US10464702B2 (en) 2014-05-15 2019-11-05 S2F Flexico Form fill and seal machine for a bag including a drawstring tape or cord and method for manufacturing such a bag

Also Published As

Publication number Publication date
JPH0655673A (ja) 1994-03-01

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