EP0256375B1 - Procédé et dispositif pour la fabrication d'un bloc de sacs - Google Patents

Procédé et dispositif pour la fabrication d'un bloc de sacs Download PDF

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Publication number
EP0256375B1
EP0256375B1 EP87110985A EP87110985A EP0256375B1 EP 0256375 B1 EP0256375 B1 EP 0256375B1 EP 87110985 A EP87110985 A EP 87110985A EP 87110985 A EP87110985 A EP 87110985A EP 0256375 B1 EP0256375 B1 EP 0256375B1
Authority
EP
European Patent Office
Prior art keywords
bags
punching
cutter
cuts
sheet web
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
EP87110985A
Other languages
German (de)
English (en)
Other versions
EP0256375A1 (fr
Inventor
Günter Mattiebe
Klaus Ullmann
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 AT87110985T priority Critical patent/ATE57352T1/de
Publication of EP0256375A1 publication Critical patent/EP0256375A1/fr
Application granted granted Critical
Publication of EP0256375B1 publication Critical patent/EP0256375B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/001—Blocks, stacks or like assemblies of 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing 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
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B31B70/18—Cutting webs longitudinally
    • 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
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/984—Stacking bags on wicket pins

Definitions

  • the invention relates to a method and an apparatus for producing a stack of bags, consisting of bags formed from rectangular film sections made of thermoplastic, which are folded around themselves at their bottom folding edges, with side weld seams and on their opening sides with central grip hole punchings and lateral corner pieces delimited by perforation lines that have aligned stacking holes.
  • DE-U-74 29 628 discloses a stack of bags of this type, in which, in order to save material, the suspension strip which is otherwise customary and extends across the width of the bag and is provided with hanging holes and from which the bags are torn off along a perforation line, is dispensed with.
  • each bag can be provided with perforation lines delimiting the two upper corner regions thereof, while the front wall of the bag has sections in its corner regions which are approximately congruent with the corner regions of the rear wall.
  • Such stacks of bags make it possible to save 50% of the material compared to the known stack of bags, because only the rear walls of the bags are provided with corner areas serving for stacking and holding.
  • the individual pouch can be more easily torn off the stack of pouches because only one perforation line covering a wall has to be severed for this purpose.
  • the perforation lines can be curved, preferably quarter-circular, with parts approximately perpendicular to the opening and side edges.
  • the perforation lines can have webs of different lengths, the web lengths being adapted to the force curve when the bags are torn off along the perforation lines and the possible curve shape of the perforation lines in such a way that tearing off along the perforation line is ensured.
  • This configuration is particularly advantageous and expedient for reasons of simple and economical production of the bags according to the invention. This is because the bags are expediently produced starting from a flat plastic film web, the side parts of which are folded over onto the central part of the film in such a way that their side edges lie at a close distance from their center line. When processing this plastic film stream folded in this way, it must absorb stresses before the transverse welding of the individual bags and transmit them without substantial stretching.
  • the tucked-in side parts of the plastic film web are weakened by semicircular punched-outs, so that further weakening of the middle part should also be avoided. Since the perforation lines have to be made in the middle part, the weakening cannot be completely dispensed with.
  • the web lengths of the punched perforation lines are thus designed in accordance with the invention in such a way that weakening of the web is avoided as far as possible on the one hand, but on the other hand non-destructive tearing of the bags from the bag block is ensured.
  • the perforation lines can be arranged such that they have long material webs in the areas of the opening edge and the side edge of the bag and shorter material webs between them. This arrangement of the shorter and longer webs of material takes into account the tensile and shear stresses occurring in the web, so that the web is not subject to any noteworthy expansions in spite of the punched-in perforation lines.
  • the material webs expediently decrease in length from the long to the short, so that good tearing of the bags from the stack is ensured after the tearing at the side edges.
  • the film strives to tear straight ahead due to the material properties.
  • tear-off perforation line has a curved shape, shorter webs ensuring better tear-off should be provided, in particular in the area of curvature.
  • each bag expediently ends in front of the upper edge of the rear wall, so that it has an overlap-free strip.
  • Such an embodiment of stacked bags is known per se from DE-OS 24 08 831.
  • the bags can also be blocked together in the area of the perforated corners in the stack.
  • the blocking can also take place in the area of the stacking or hanging holes.
  • GB-A-707 346 already discloses a process for producing bags which consist of rectangular film sections made of thermoplastic material, the side parts of a plastic film web being folded over onto its central part in such a way that its side edges lie at a close distance from their center line.
  • the plastic film web folded in this way is conveyed intermittently by one bag width through punching and welding stations, and finally the bags, which are still connected in pairs, are separated from one another by cuts made along the center line of the plastic film web, and if necessary. stacked.
  • EP-A 136 171 describes an apparatus for carrying out a method of manufacture known from stacks of bags, these stacks of bags also consist of bags formed from rectangular film sections of thermoplastic material. These bags have perforation and / or cut lines. These perforation and / or separating cut lines are produced according to this prior art with a punching device which consists of at least one knife plate and one abutment plate. The abutment plate engages between a central part of the intermittently conveyed plastic film web.
  • this object is achieved according to the invention by a method having the features of the characterizing part of claim 1. Accordingly, while the plastic film web is being conveyed through the punching and welding stations, the corner areas of the later rear walls of four bags lying next to one another and in pairs in mirror image to one another are first provided with the perforation lines and with the stacking or hanging holes by a closed line. The corner punch cut-outs of the later bag front wall are then made. Then the grip hole punching and the cross-weld separating seams forming the bag side seams or in pairs cross-weld seams are made with separating cuts lying between them.
  • the cuts forming the tear-off perforation lines and corner punch cut-outs can be made by circumferential circular or elliptical cuts. However, the cut forming the corner punch cut-outs is interrupted by the gap existing between the inside edges of the web which are turned inwards.
  • the tear-off perforation lines are rectilinear in their end regions and are approximately at right angles on the side and opening edges.
  • the circumferential cut lines or tear-off perforation lines are designed as square cut lines with rounded corners or polygonal cut lines such that the perforation lines entering the side and opening edges are approximately at right angles to these.
  • the stack of bags 1 consists of stacked bags 2 which have been formed from rectangular plastic film sections by folding around the bottom fold line 3 on themselves.
  • the opening edges 4 of the front walls end at a distance from the opening edges 5 of the rear walls of the bags 2, so that overlapping strips 6 of the rear wall are formed on the opening side.
  • the bags 2 are provided in the middle with grip hole punchings 7 in the usual way.
  • the front walls of the bags 2 are provided with approximately quarter-circular punched-outs which are delimited by the cutting edges 8.
  • the rear walls are approximately congruent with these cut edges with quarter-circle perforation lines 9.
  • the corner regions 10 of the rear walls, delimited by the perforation lines 9, are provided with punched holes 11, which serve for stacking and / or hanging the stacked bags 2.
  • the perforation lines 9 run approximately perpendicularly into the upper opening edges and into the lateral edges.
  • the perforation lines 9 have longer material webs 12, 13 in the region of the opening edges 5 and in the region of the sides.
  • the material webs 12, 13 are represented by solid lines.
  • An area with shorter material webs is provided between the longer material webs 12, 13.
  • cut edges 8 and the perforation lines 9 are arranged approximately congruently. In the drawing they are shown offset from one another for the sake of clarity.
  • the individual bags 2 are provided in the usual way with side welds.
  • the double-folded web 21 prepared in this way is then conveyed by a conveyor in known manner intermittently by steps corresponding to a bag width through the punching station 22, in which the corner configurations of the later bags are punched.
  • the punching device consists of a knife plate 23 which is fixed to the frame and which is provided with four punching tools 24 with an annular cutting edge for punching the stacking or holding holes 11 and with perforation knives 25 which surround this in a circular manner and which serve to punch the perforation lines 9.
  • the abutment plate 26 is lowered onto the corresponding middle part 17 of the plastic film web 21.
  • the abutment plate 26 is attached to its actuation on the piston rod 28 of the cylinder 29 fixed to the frame.
  • the upper side of the abutment plate 26 serves as an abutment for the likewise circularly arranged knives 30 which are arranged on the knife plate 31.
  • the knife plate 31 is actuated by the piston rods 32, 33 of cylinders 34, 35, which are fastened to a holding plate 36, which in turn are fastened on the piston rod 28 of the cylinder 29.
  • the gap formed between the side edges 18, 19 of the film web 21 is so wide that it is able to accommodate the piston rod 28, so that the abutment plate 26 can be inserted between the middle part 17 and the struck side parts 15, 16 of the film web 21.
  • the cylinders 29, 34, 35 are provided in a manner not shown with supply hoses through which a pressure medium, for example oil or pressure run, is fed to them.
  • a pressure medium for example oil or pressure run
  • the ring-shaped knife 30 arranged on the underside of the knife plate 31 punches the corner cutouts 8 into the later corner areas of the turned-in web parts.
  • the width of the knife 25 cutting into the perforations 9 is such that the perforation cut has long web parts 12 in the transverse direction of the web and web parts 13 curve in the longitudinal direction of the web.
  • the individual bags are later welded off from the web 21 provided with the corresponding corner configurations along the dashed cross lines 40 by cross-weld separating seams.
  • the double bags connected in this way in the area of the center line are later separated from one another by longitudinal cuts.
  • the finger hole punchings 7 can be punched with the cross weld separating seams or else separately.
  • Fig. 5 shows a plan view of a plastic film 41, which is provided in the corner areas of the still connected bags with a square circumferential perforation punch cut 42 and an approximately congruent cut along a cutting line 43, which in the area of the longitudinal center line 20 of the film web through the between the inner edges 44, 45 of the formed web parts gap is interrupted.
  • the square perforation cuts and cutouts have rounded corners such that they open at right angles in the manner shown in the later opening edges and side edges of the bags.
  • the perforation cuts 42 are made in the area of the side edges and opening edges of the later bags with longer webs and between them with shorter webs.
  • FIG. 4 shows a top view of a plastic film web which is provided in the area of the corners of the still connected bags with a round perforated punch cut 46 and a roughly identical, likewise round cutout 47.
  • the webs of the perforation punch cuts are each 0.5 mm long and only 0.3 mm long between them.
  • FIG. 6 shows a plan view of a plastic film web, which is provided with an octagonal perforation cut 48 and an approximately congruent cutout 49 in the area of the still connected corners of the later bags.
  • the octagonal shape of the perforation punch cuts ensures that they open into the later opening edges and side edges of the bags with relatively long legs.
  • the legs of the perforation punch lines which are approximately vertical on the later opening edges and side edges of the bags, are formed with longer webs.
  • a knife plate 51 is fastened to a carrier 50 of the frame with a circular perforation knife 52.
  • a holder 55 for an abutment plate 56 is fastened to guide bolts 53, 54 and covers the perforation knife 52.
  • the guide bolts 53, 54 are guided in longitudinally displaceable fashion in bores in a guide plate 57 of the frame.
  • the abutment plate 56 is held in its upper position by compression springs 58.
  • a circular punching knife 60 is fastened to the piston rod 61 of the pneumatic cylinder 62 above the abutment plate 56.
  • the guide bolts 53, 54 engage between the gap which is formed between the inner edges of the folded-in side parts of the film web 45, so that the abutment plate 56 lies between the middle part and the turned-in side parts of the film web 45.
  • the abutment plate 56 After lifting the upper punching knife 60, the abutment plate 56 also lifts off the lower perforation knife 52 under the action of the compression springs, so that the web 45 can be moved intermittently.
  • Punching tools 65 are provided for executing the suspension holes and are fastened to the piston rod of a pneumatic cylinder 67 via a carrier plate 66.
  • the punching tools 65 pass through the knife plate 51 and the abutment plate 56 in corresponding bores which also serve as guides. During the execution of the punch cuts and the formation of the circumferential perforation lines, the punch tools 65 are extended and returned to punch the hanging holes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Steroid Compounds (AREA)

Claims (6)

1. Procédé pour la fabrication d'un bloc de sacs constitué par des sacs formés à partir de segments de feuille en matière thermoplastique, les parties latérales (15, 16) d'une bande de film plastique (21) étant rabattues sur sa partie médiane (17) de façon que ses arêtes latérales (18, 19) se trouvent placées devant sa ligne médiane (20) tout près de celle-ci, la bande de film plastique (21) ainsi pliée avançant de façon intermittente par pas correspondant chacun à une largeur de sac en passant par des postes de découpage et de soudage, et finalement, les sacs encore attachés les uns aux autres par paires étant séparés les uns des autres par des coupes effectuées le long de la ligne médiane (20) de la bande de film plastique et étant empilés, caractérisé en ce que, pendant que la bande de film plastique (21) avance en traversant les postes de découpage et de soudage, dans un premier temps, les coins (10) supérieurs des parois arrière ultérieures de quatre sacs juxtaposés et jumelés deux par deux de façon inversement symétrique sont pourvus, suivant une ligne fermée, de lignes de perforations (9) et de trous (11) d'empilage ou de suspension, ensuite de quoi, dans les coins supérieurs de la paroi avant ultérieure des sacs, sont réalisées des découpures d'angle qui sont formées au moyen de coupes de déparation (8) coïncidant sensiblement avec les lignes de perforations (9), puis il est procédé au poinçonnage des trous de poignée et à la réalisation de soudures de séparation transversales formant les lignes de joint latérales des sacs, ou à la réalisation de soudures transversales jumelées avec des coupes de séparation dans l'intervalle.
2. Procédé selon la revendication 1, caractérisé en ce que les coupes formant les lignes de perforations d'arrachage et les découpures d'angle sont effectuées sous la forme de coupes à périphéries (46, 47) circulaires ou elliptiques.
3. Procédé selon la revendication 1, caractérisé en ce que les coupes formant les lignes de perforations d'arrachage et les découpures d'angle sont effectuées sous la forme de lignes de coupe rectangulaires à angles (42, 43) arrondis ou de lignes de coupe (48, 49) polygonales et que les lignes de perforations aboutissant dans les bords de l'ouverture des sacs et dans les parties latérales des sacs sont dirigées perpendiculairement à deux.
4. Dispositif pour la mise en oeuvre de procédé selon la revendication 1, avec une installation de découpage (22) qui comprend au moins une plaque à couteau et une plaque d'appui (26) qui s'engage entre une partie médiane de la bande de film plastique (21) avançant de façon intermittente et ses parties latérales (15, 16) rabattues, caractérisé en ce que l'installation (22) découpant les configurations d'angle des sacs (2) est constituée par une plaque portelames (23) solidaire du bâti avec des lames de perforation (25) disposées en cercle ou en ellipse et avec des lames (24) poinçonnant les trous d'empilage ou de suspension, plaque sur laquelle peut s'abaisser la plaque d'appui (26) qui est fixée à une tige de piston (28) d'um vérin (29) solidaire du bâti, et que le côté supérieur de la plaque d'appui (26) est l'élément d'appui pour une plaque porte-lames (31) découpant des découpures en forme de quart-de-cercle qui est fixée à des tiges de piston (32, 33) de vérins (34, 35) qui sont disposés sur une traverse (36) fixée à la tige de piston (28) du vérin (29) solidaire du bâti.
5. Dispositif selon la revendication 4, caractérisé en ce que l'installation de découpage découpant les configurations d'angle des sacs (2) empilés est constituée par une plaque porte- lames (51) solidaire du bâti avec une lame de perforation (52) de forme circulaire ou elliptique, qu'au-dessus de la plaque porte-lame (52) est fixée, pour s'abaisser et se soulever, à la tige de piston (61) d'un vérin (62) hydraulique, une lame (60) circulaire ou elliptique découpant des découpures en forme de quart-de-cercle, et qu'il est prévu entre la lame et la plaque porte-lame de perforation (51, 52) une plaque d'appui (56) qui s'engage entre la partie médiane de la bande de film plastique (45) avançant de façon intermittente et les parties latérales rabattues de cette même bande, est guidée pour se déplacer parallèlement à elle-même et pour pouvoir s'abaisser, et est tenue par des ressorts (58) dans sa position supérieure de telle sorte qu'elle est abaissée par la lame (60) supérieure et serrée contre la lame de perforation (52).
6. Dispositif selon la revendication 5, caractérisé en ce que sont disposés dans le bâti des poinçons (65) se soulevant et s'abaissant sous l'action d'un vérin pneumatique (68) pour découper les trous de suspension, qui traversent la plaque porte-lame (51) inférieure et la plaque d'appui (56) dans des trous de guidage et de matrice appropriés.
EP87110985A 1986-08-19 1987-07-29 Procédé et dispositif pour la fabrication d'un bloc de sacs Expired - Lifetime EP0256375B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110985T ATE57352T1 (de) 1986-08-19 1987-07-29 Verfahren und vorrichtung zur herstellung von beutelstapeln.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3628031 1986-08-19
DE3628031 1986-08-19
DE19873700914 DE3700914A1 (de) 1986-08-19 1987-01-14 Beutelstapel sowie verfahren und vorrichtung zu seiner herstellung
DE3700914 1987-01-14

Publications (2)

Publication Number Publication Date
EP0256375A1 EP0256375A1 (fr) 1988-02-24
EP0256375B1 true EP0256375B1 (fr) 1990-10-10

Family

ID=25846663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110985A Expired - Lifetime EP0256375B1 (fr) 1986-08-19 1987-07-29 Procédé et dispositif pour la fabrication d'un bloc de sacs

Country Status (7)

Country Link
US (1) US4903839A (fr)
EP (1) EP0256375B1 (fr)
CA (1) CA1291079C (fr)
DE (1) DE3700914A1 (fr)
DK (1) DK430187A (fr)
FI (1) FI86396C (fr)
NO (1) NO172972C (fr)

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Also Published As

Publication number Publication date
NO172972C (no) 1993-10-06
DE3700914C2 (fr) 1990-08-30
DE3700914A1 (de) 1988-02-25
NO172972B (no) 1993-06-28
FI873565A0 (fi) 1987-08-18
FI86396C (fi) 1992-08-25
FI873565A (fi) 1988-02-20
NO873474D0 (no) 1987-08-18
DK430187A (da) 1988-02-20
EP0256375A1 (fr) 1988-02-24
CA1291079C (fr) 1991-10-22
FI86396B (fi) 1992-05-15
DK430187D0 (da) 1987-08-18
US4903839A (en) 1990-02-27
NO873474L (no) 1988-02-22

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