EP0266670A2 - Sac de transport en feuille de matière thermoplastique - Google Patents

Sac de transport en feuille de matière thermoplastique Download PDF

Info

Publication number
EP0266670A2
EP0266670A2 EP87115864A EP87115864A EP0266670A2 EP 0266670 A2 EP0266670 A2 EP 0266670A2 EP 87115864 A EP87115864 A EP 87115864A EP 87115864 A EP87115864 A EP 87115864A EP 0266670 A2 EP0266670 A2 EP 0266670A2
Authority
EP
European Patent Office
Prior art keywords
grid
rows
areas
bag according
welding
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.)
Granted
Application number
EP87115864A
Other languages
German (de)
English (en)
Other versions
EP0266670B1 (fr
EP0266670A3 (en
Inventor
Robert Wagner
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.)
STIEGLER GmbH MASCHINENFABRIK
Original Assignee
STIEGLER GmbH MASCHINENFABRIK
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 DE19868629509 external-priority patent/DE8629509U1/de
Priority claimed from DE8708719U external-priority patent/DE8708719U1/de
Application filed by STIEGLER GmbH MASCHINENFABRIK filed Critical STIEGLER GmbH MASCHINENFABRIK
Priority to AT87115864T priority Critical patent/ATE73083T1/de
Publication of EP0266670A2 publication Critical patent/EP0266670A2/fr
Publication of EP0266670A3 publication Critical patent/EP0266670A3/de
Application granted granted Critical
Publication of EP0266670B1 publication Critical patent/EP0266670B1/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
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
    • 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
    • B65D33/06—Handles
    • B65D33/08—Hand holes

Definitions

  • the innovation relates to a carrier bag made of thermoplastic plastic film with grip holes in the pocket walls and with reinforcement film made of thermoplastic plastic film, such as reinforcing sheets, surrounding the grip holes and pattern-welded in partial areas with the pocket walls.
  • Carrying bags or bags of the aforementioned type are widely known.
  • the filling weight or carrying weight of such bags is determined by the pull-out strength of the grip holes. This is increased by means of reinforcement sheets which are either glued or welded on the inside of the carrier bags.
  • the welding is carried out in a known manner with permanently heated welding head punches with welding strips arranged parallel to one another, whereby a stripe pattern is created for the welded surfaces. Instead of using welding strips, it is also known to work with pulse bands. In these common welding processes for the production of flat weld seams, heat is applied by the welding stamp on one side. Because the welds are not under pressure afterwards cooled, they get a wavy appearance with many types of plastic film.
  • the invention has for its object to reduce the wavy appearance or shrinkage of the foils produced during the partial welding of the reinforcement sheets to the carrier bags and at the same time to achieve the necessary welding strengths and to increase the carrying capacity of the carrier bag. At the same time, care must be taken that the production cycles not be extended.
  • the reinforcing film and the pocket walls are welded to one another by grid-shaped point surfaces.
  • the punctiform surfaces can have a square, square, rectangular or triangular or rounded or round shape.
  • many small welded connecting surfaces are created between the reinforcement sheet and the pocket wall, which are preferably approximately of the same size, have approximately the same shape and are approximately uniformly distributed on the reinforcement film, for example in the form of reinforcement sheets.
  • the large number of very small welded surfaces so-called point surfaces, reduces the shrinkage of the films and thus achieves a more uniform and better appearance of the welded areas, and essentially maintains the smooth appearance of the films welded together. This is due to the fact that many small welded areas only produce many small shrinkage portions which are relatively evenly distributed over a large area.
  • the sum of the point areas forming the welds can be kept very small compared to the sum of the unwelded areas of the grid.
  • the sum of the point areas forming the welds to the sum of the unwelded areas of the grid area is preferably in a ratio of about 1: 2 to 1: 4.
  • the grid-shaped welded connection between pocket walls and reinforcing sheets achieves at least the strengths which can be achieved with known welds, and - depending on the design of the grid - even exceeds them.
  • the invention includes as reinforcement sheets both the separate and the grip hole reinforcement sheets formed by folding over the film of the pocket.
  • the rows of the grid formed by the point surfaces can run perpendicularly or approximately perpendicularly to one another. In one possible embodiment, the rows run parallel to the pocket bottom or to the pocket longitudinal axis. It is also possible to arrange the rows of grid, which are perpendicular to one another, at an angle to the longitudinal axis of the pocket.
  • a preferred embodiment and arrangement of the welding grid of the reinforcing sheet and the wall of the carrier bag provides that the grid rows run at an angle ⁇ of 45 ° to the longitudinal axis of the carrier bags.
  • a welding pattern of the reinforcement sheet and the wall of the carrier bag is then obtained, in which the welding squares are aligned with a diagonal parallel to the longitudinal axis of the carrier bag.
  • This arrangement of the grid causes a good reinforcement of the grip hole. In particular, there is an even load distribution. But it is also possible to design the grid so that the grid rows intersect at a different (than 90 °) angle. However, the grid should always be symmetrical to the longitudinal axis of the pocket to ensure an even load-bearing capacity.
  • the dot areas can either all be the same size and the same or they can be adapted to the course of the rows.
  • the arcuate grid rows are preferably arranged parallel to one another at equal distances from one another, as are the grid rows running parallel to the longitudinal axis of the carrier bag.
  • the carrier bags and pouches according to the invention are usually produced from mono- or composite films based on polyolefins, such as high-pressure polyethylene, linear polyethylene, low-pressure polyethylene and possibly other suitable thermoplastic plastics, and have reinforcing sheets with a thickness of approximately 50 to 120 ⁇ m made from films based on polyolefins that can be easily welded to the bags
  • the size of the reinforcement sheets also depends on the shape of the grip hole and the size of the carrier bags, and should generally surround the grip hole by at least about 20 mm all around.
  • reinforcement sheets can either be formed and applied separately or, e.g. can be formed by simply or double folding the film over the top edge of the bag.
  • the grid to be used for the formation of the welding surfaces according to the invention is advantageously formed with point surfaces with a size of approximately 2 to approximately 16 mm 2 and grid rows with a spacing of approximately 3 to 10 mm, measured from the central axes of the rows.
  • point surfaces with a size of approximately 2 to approximately 16 mm 2 and grid rows with a spacing of approximately 3 to 10 mm, measured from the central axes of the rows.
  • approximately rectangular or square point areas are formed.
  • a denser grid that is to say enlarged welding areas compared to the other areas, is provided to the area adjoining the pocket bottom.
  • the denser grid can be formed by dot areas that are enlarged compared to the other areas, or, if the number of dot areas per area unit is the same, the number of dot areas is increased.
  • the inventive design of the welding surfaces of the reinforcing sheets in the case of carrier bags has the further advantage that compliance with dimensional tolerances is facilitated and simplified for the assignment of the welding stamp to the grip hole, since tolerances of the grip hole to the welding pattern play a smaller role in the innovation - when slipping - than with conventional sweatstrip patterns.
  • An asymmetry in the assignment of the grip hole to the welding strips of the known techniques immediately leads to a loss of strength, while such an asymmetry has less of an effect on the welding pattern according to the invention with a large number of punctiform welding surfaces.
  • FIG. 1 shows a carrier bag 1 with front and rear walls 1a, b, with a bottom fold 4 on the bottom of the pocket and a grip hole 2 formed in each wall below the carrying edge and the opening 9.
  • the grip hole 2 is reinforced by reinforcement sheets 3a, 3b made of plastic film welded on the inside of the walls 1a, b of the carrying bag.
  • the side edges 10 are welded.
  • the grip hole can have the shape of an elongated hole, banana or ellipse or the like.
  • the reinforcing sheets 2 can also be welded to the outside of the carrier bag walls.
  • FIG. 3 the force field 5 generated when filling the carrying bag 1 and by carrying it as a result of the carrying weight shown schematically.
  • the lines of force run somewhat inclined from the longitudinal axis 6 of the carrier bag towards the corners at the bottom of the carrier bag. The greatest stresses occur in the area of the side grip hole edges below it.
  • This force field is advantageously absorbed by the grid-like welding of reinforcing sheets 3a, 3b to the walls 1a, 1b of the carrying bag, and the strength and carrying capacity of the carrying bag 1 are thereby increased.
  • FIG. 4 shows an extract of a possible grid design with point surfaces 7, which are arranged in rows 8, 18 in the grid surface 20, for welding the reinforcement sheets 3 in the region of the grip hole 2 to the plastic film of the pocket wall la.
  • the grid and grip hole shown are about natural size.
  • the free distance c between the grid rows will be approximately between 1.5 to 4 mm, c preferably being chosen to be equal to or slightly larger than a or b.
  • the preferred dot-area grid with the dot areas 7, which form the welded areas is an extract according to the invention Welding of the reinforcement sheets 3 in the region of the grip hole 2 is shown.
  • the grid and grip hole shown are about natural size.
  • the grid shown is still relatively easy to produce as a welding stamp.
  • the one formed by the point surfaces 7 grid rows 8 run parallel to the longitudinal axis 6 of the carrier bag, the other grid rows 18 only approximately perpendicular to it in arcuate parallel lines, so that they are symmetrical to the longitudinal axis 6 and concave with respect to the support edge 9 or The opening of the carrier bag runs.
  • the grid rows are preferably arranged at equal distances from one another.
  • the grid has approximately square point areas 7, which represent the welded areas, of approximately 4 mm 2, the point areas 7 further away from the longitudinal axis 6 being slightly rectangular-diamond-shaped and somewhat enlarged.
  • the point surfaces 7 of the rows 8, 18 could also be the same size, they could also be staggered with respect to one another.
  • the distance e or d of the rows 8, 18 from one another, measured from their central axes, is approximately 4 mm, the edge lengths a, b of the welded point surfaces are each approximately 2 mm. This results in a ratio of the welded surfaces 7 to the unwelded surface areas of the grid of approximately 1: 3.
  • Other grid patterns of uniform or mixed configurations are also possible.
  • the distances e and d of the grid rows from one another should be approximately 3 to 10 mm, preferably a or b being selected to be equal to or somewhat smaller than half the row spacing from one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Laminated Bodies (AREA)
  • Details Of Garments (AREA)
  • Packages (AREA)
EP87115864A 1986-11-05 1987-10-29 Sac de transport en feuille de matière thermoplastique Expired - Lifetime EP0266670B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87115864T ATE73083T1 (de) 1986-11-05 1987-10-29 Tragetasche aus thermoplastischer kunststoffolie.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19868629509 DE8629509U1 (de) 1986-11-05 1986-11-05 Tragtasche aus thermoplastischer Kunststoffolie
DE8629509U 1986-11-05
DE8708719U 1987-06-24
DE8708719U DE8708719U1 (de) 1987-06-24 1987-06-24 Tragetasche aus thermoplastischer Kunststoffolie

Publications (3)

Publication Number Publication Date
EP0266670A2 true EP0266670A2 (fr) 1988-05-11
EP0266670A3 EP0266670A3 (en) 1989-04-26
EP0266670B1 EP0266670B1 (fr) 1992-03-04

Family

ID=25951195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87115864A Expired - Lifetime EP0266670B1 (fr) 1986-11-05 1987-10-29 Sac de transport en feuille de matière thermoplastique

Country Status (4)

Country Link
EP (1) EP0266670B1 (fr)
AT (1) ATE73083T1 (fr)
DE (1) DE3777078D1 (fr)
ES (1) ES2030032T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1129960A1 (fr) * 2000-02-18 2001-09-05 Goglio Luigi Milano S.P.A. Récipient souple avec une poignée renforcée contre la déchirure
EP1574447A1 (fr) * 2004-03-08 2005-09-14 Nordenia Deutschland Halle GmbH Sac en film multicouche muni de poignées
EP1746044A1 (fr) * 2005-07-21 2007-01-24 Hugo Beck Maschinenbau GmbH & Co. KG Sachet d'emballage comportant un trou de suspension et procédé pour sa fabrication

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2185470B1 (es) * 2001-01-05 2004-08-16 Amadeo Roige Bragulat Bolsa.
US11814225B2 (en) 2019-03-28 2023-11-14 The Glad Products Company Multi-film thermoplastic structures having visually-distinct contact areas arranged in text and methods of making the same
WO2020198107A1 (fr) 2019-03-28 2020-10-01 The Glad Products Company Structures thermoplastiques multicouches et sacs ayant des zones de contact visuellement distinctes et leurs procédés de fabrication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU44130A1 (fr) * 1962-07-28 1965-01-25
FR1579834A (fr) * 1967-09-12 1969-08-29
DE1479356B1 (de) * 1962-07-31 1970-01-22 Kannegiesser Maschinen Vorrichtung zum Aneinanderheften von duennwandigen Folien aus thermoplastischem Kunststoff,bzw. kunststoffkaschierten,duennwandigen Flaechengebilden,insbesondere textilen Flaechengebilden,durch thermisches Schweissen
DE8708719U1 (de) * 1987-06-24 1987-08-20 Stiegler GmbH Maschinenfabrik, 73635 Rudersberg Tragetasche aus thermoplastischer Kunststoffolie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU44130A1 (fr) * 1962-07-28 1965-01-25
DE1479356B1 (de) * 1962-07-31 1970-01-22 Kannegiesser Maschinen Vorrichtung zum Aneinanderheften von duennwandigen Folien aus thermoplastischem Kunststoff,bzw. kunststoffkaschierten,duennwandigen Flaechengebilden,insbesondere textilen Flaechengebilden,durch thermisches Schweissen
FR1579834A (fr) * 1967-09-12 1969-08-29
DE8708719U1 (de) * 1987-06-24 1987-08-20 Stiegler GmbH Maschinenfabrik, 73635 Rudersberg Tragetasche aus thermoplastischer Kunststoffolie

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1129960A1 (fr) * 2000-02-18 2001-09-05 Goglio Luigi Milano S.P.A. Récipient souple avec une poignée renforcée contre la déchirure
EP1574447A1 (fr) * 2004-03-08 2005-09-14 Nordenia Deutschland Halle GmbH Sac en film multicouche muni de poignées
WO2005085080A2 (fr) * 2004-03-08 2005-09-15 Nordenia Deutschland Halle Gmbh Sachet en film constitue d'un film composite a au moins deux couches avec une region de saisie decoupee
EP1588953A1 (fr) * 2004-03-08 2005-10-26 Nordenia Deutschland Halle GmbH Sac en film multicouche muni de poignées
WO2005085080A3 (fr) * 2004-03-08 2005-12-22 Nordenia D Halle Gmbh Sachet en film constitue d'un film composite a au moins deux couches avec une region de saisie decoupee
EP1746044A1 (fr) * 2005-07-21 2007-01-24 Hugo Beck Maschinenbau GmbH & Co. KG Sachet d'emballage comportant un trou de suspension et procédé pour sa fabrication

Also Published As

Publication number Publication date
DE3777078D1 (de) 1992-04-09
EP0266670B1 (fr) 1992-03-04
ATE73083T1 (de) 1992-03-15
EP0266670A3 (en) 1989-04-26
ES2030032T3 (es) 1992-10-16

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