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EP4091963A1 - Sachet à cordon d'une matière de film plastique thermoplastique - Google Patents

Sachet à cordon d'une matière de film plastique thermoplastique Download PDF

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Publication number
EP4091963A1
EP4091963A1 EP21174329.9A EP21174329A EP4091963A1 EP 4091963 A1 EP4091963 A1 EP 4091963A1 EP 21174329 A EP21174329 A EP 21174329A EP 4091963 A1 EP4091963 A1 EP 4091963A1
Authority
EP
European Patent Office
Prior art keywords
drawstring
side walls
hems
cord
drawstring bag
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.)
Pending
Application number
EP21174329.9A
Other languages
German (de)
English (en)
Inventor
Henning RÖTTGER
Dirk Hermann
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.)
W Pelz & Co KG GmbH
Original Assignee
W Pelz & Co KG GmbH
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 W Pelz & Co KG GmbH filed Critical W Pelz & Co KG GmbH
Priority to EP21174329.9A priority Critical patent/EP4091963A1/fr
Publication of EP4091963A1 publication Critical patent/EP4091963A1/fr
Pending 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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/28—Strings or strip-like closures, i.e. draw closures

Definitions

  • the invention relates to a drawstring bag made from a thermoplastic plastic film material.
  • Drawstring bags made of a thermoplastic plastic film material such as polyethylene (PE) or polypropylene (PP) are used in particular for packaging cotton pads, cotton balls or other cotton-wool products.
  • PE polyethylene
  • PP polypropylene
  • Drawstring bags are used in particular for packaging cotton pads, cotton balls or other cotton-wool products.
  • they are often designed as bottom-filling bags, with the bag mouth being closed by an end wall and the bag being filled with cotton wool from the bottom side and being closed by a bottom weld. After opening the bulkhead, cotton can be removed.
  • the drawstrings are used to hang up and to close the opened bag.
  • drawstring bags for residual waste, organic waste or plastic with an open bag mouth that can be closed after filling by pulling the drawstring, which is usually designed as a drawstring.
  • the DE 42 44 024 describes a drawstring bag made of a thermoplastic, weldable film material in the form of a bottom-filling bag, which has a cord hem enclosing the bag mouth on the top side and delimiting at least one channel in which drawcords are accommodated.
  • the channel is arranged between the outside of the respective film web and its outwardly folded parts forming the cord seam, the folded parts being welded to the film webs by longitudinal seam welds which are spaced apart from and approximately parallel to longitudinal welds running at the bag mouth.
  • the drawstrings are made of a thermoplastic material which, with regard to environmental compatibility, is a plastic that can be recycled together with the material of the film webs without prior separation.
  • the DE 20 2019 005 520 U1 describes a resealable film package in which the front and back are each made of a plastic film, there being a front passageway with a plastic thread running through this at the upper edge of the front side and a rear passageway with a plastic thread running through this at the upper edge of the rear side.
  • the side edges of the front are welded to the side edges of the back outside of the passages and are not welded in a portion of the passages.
  • the front, the back and the plastic thread or the plastic cord are made of the same plastic, for example polyethylene, PE, or polypropylene, PP or recycled plastic of a plastic type. This should allow the film packaging to be recycled without separating the material.
  • the side edges are tear edges or cut edges in the area where they are not welded.
  • An apparatus for manufacturing the film package includes a sever-seal apparatus capable of producing the welded side edges of the front and back outside the passages by sever-seal continuous plastic film, sparing a portion of the passages from the sever-seal to sever the thermoplastic cord , which has a melting point similar to that of the film.
  • a heated stamp has a thermally insulating cover or cutout, due to which the front and the back are not melted in the area cut out by the cut-off weld.
  • the disadvantage is that the tear-off edges can cause process disruptions and an unclean tear-off of the film packaging.
  • production is made more difficult by the fact that the cut edges in the non-welded area of the side edges have to be aligned precisely with the separating welds on the side edges so that the individual bags can be separated from the endless plastic film.
  • the object of the invention is to provide a drawstring bag that has more favorable manufacturing properties and allows the foil and cord to be recycled together without prior separation. Furthermore, a device for producing the drawstring bag is to be made available.
  • the drawstring bag needs after Separation welding of the lateral welds not to be torn from the endless film web. There is also no need to make cuts in the area of the drawstring hems that are aligned exactly with the lateral edges of the side walls or the cutting lines between the lateral weld seams in order to separate the drawstring bag from the endless plastic film.
  • the cutouts can be made relatively imprecisely in the plastic film material, since they have a certain extent, which makes it possible to ensure that the cutouts are arranged above the lateral edges.
  • the recesses can be produced in the plastic film material before the sections are folded over at the upper edge of the side walls.
  • the recesses also eliminate the need for a cut-off welder to extend to the top of the sidewalls. Rather, to form the lateral edges and lateral welds, it is sufficient to form the cut-off sealer so that it extends just to the bottom edge of the recesses, thereby preventing physical proximity of the hot sealer to the thermoplastic cord.
  • the recesses can be formed as punched-out portions. These can easily be stamped into the plastic sheet material.
  • the cutouts can be punched together with other punches, for example with the punching of ventilation holes, so that no additional effort is required as a result.
  • the drawstring bags can thus be produced in a particularly fast, stable and less fault-prone process.
  • the drawcords freely exit the ends of the drawstring hems. The drawcords can easily be pulled out of the unsealed through-openings of the hems because the Extraction is not impeded by welds reaching up to the drawcords.
  • the cavities are rectangular.
  • the lateral edges of the side walls are offset inwards or the lateral edges at the ends of the hems have a shoulder.
  • the recesses are concave. This counteracts tearing of the plastic film material at the cutouts during production or when the drawstring bag is pulled closed or carried.
  • the recesses are in the shape of a quarter of a circle. Quarter circle shaped cutouts can be made at adjacent seam ends of two adjacent drawstring bags formed from the plastic film material by stamping circular cutouts.
  • the drawstrings are made of a thermoplastic material or of cotton.
  • a thermoplastic material is possible without any problems, because the drawstrings do not run the risk of being welded to the lateral edges due to the recesses.
  • the drawstring bag can be recycled without separating the material.
  • cotton drawstrings these can be easily pulled out through the through openings so that the drawstring bag can be disposed of separately from the drawstrings.
  • the drawstrings are made of a plastic material that is recyclable with the plastic material of the side walls.
  • the side walls are made of polyethylene, especially LDPE, and the drawstrings are made of polyethylene, especially HDPE, or of polyethylene terephthalate, or of polypropylene.
  • Cords are strings twisted together from several threads.
  • the term "draw cord" is understood in a broader sense.
  • the drawstrings are plastic threads or ribbons.
  • the drawstrings each consist of a single thread made of plastic or of several single threads made of plastic twisted together.
  • the drawstrings consist of a plurality of yarns twisted together, which are themselves already twisted and twisted. In this way, in particular drawstrings made of cotton can be formed.
  • the drawcords emerging from adjacent ends of the hems are knotted or welded together.
  • the fact that the drawstrings are made of thermoplastic material allows them to be easily welded together.
  • the use of devices for knotting the drawstrings can be eliminated. This can increase the speed and stability of the manufacturing process and reduce its susceptibility to failure.
  • Both plastic threads and plastic straps can be connected to one another by welding.
  • the connected ends of the drawstrings running in the front and back drawstring hems form loops that allow the drawstring bag to be hung up.
  • the mouth of the bag is closed by an end wall which is folded inwards between the two side walls when the bag is lying flat and which is welded to the two side walls via weld seams spaced apart from the upper edge.
  • the end wall has a tear-off perforation or another opening aid. This makes it easier to open the bag.
  • the tear-off perforation is, for example, a perforation line (perforation seam). This extends, for example, from one side edge to the other side edge across the end wall.
  • the end wall is connected to the lower edge of the folded portions of the side walls. This enables production from a single sheet-like plastic film material.
  • the drawstring bag has ventilation holes in the area of the side weld seams.
  • the ventilation holes make it easier to ventilate the drawstring bag when it is filled with cotton wool or another product, and a high production speed is made possible because the air can escape to the outside through the ventilation holes. This is particularly advantageous for drawstring bags with an end wall.
  • the device according to the invention for producing a drawstring bag according to one of Claims 1 to 11 or one of the previously described types of embodiment from a sheet-like plastic film material has a separating welding device which is designed and set up to weld the side walls together at the lateral edges and to separate them from one another and to not to weld and separate the ends of the cord hems in the area of the recesses.
  • the separating and sealing device has a heating and separating element to be arranged on one side of the web-shaped plastic film material and a counter-pressure element to be arranged on the other side, with either the heating and separating element or the counter-pressure element or both the heating and separating element and the counter-pressure element being did not extend over areas of the plastic sheet material designed to form the lateral recesses.
  • the recesses are produced in the plastic film material before the cut-off welding, preferably before the drawstrings are applied to the plastic film material.
  • the recesses are formed as punched-out portions or by laser cutting or laser separating in the plastic film material, preferably as circular recesses.
  • Figures 1 and 2 comprises a drawstring bag 1 two side walls 2, 3, which are welded together at their lateral edges 4, 5 by lateral welds 6, 7.
  • the upper edges 8, 9 of the two side walls 2, 3 delimit a bag mouth 10.
  • the side walls 2, 3 have, at their upper edges 8, 9, portions 11, 12 which are folded over onto the insides of the side walls. These are each welded to the respective side wall 2, 3 by an upper weld seam 13, 14 running parallel to and at a distance from the upper edge 8, 9.
  • the lower edges 15, 16 of the folded portions 11, 12 are connected to one another in one piece via an end wall 17 which is offset downwards with respect to the upper edges and closes the mouth 10 of the bag.
  • the lateral edges 4, 5 of the side walls 2, 3 each have a recess 20, 21 in the form of a quadrant at the ends of the cord hems 18, 19. At the ends of the cord seams 18, 19, the lateral edges 4, 5 of the side walls 2, 3 are not welded together. In the field of Recesses 20, 21 delimit the lateral edges 4, 5 through openings 22, 23 at the ends of the cord hems 18, 19.
  • Drawstrings 24, 25 are arranged in the two cord hems 18, 19, which emerge at the ends of the cord hems through the through openings 22, 23 to the outside and further protrude from the lateral edges 4, 5 of the side walls 2, 3 to the outside.
  • the drawstrings are connected to one another or knotted or otherwise connected to one another at two adjacent ends by welded connections 26 , 27 , resulting in a closed band that lies in the cord seams 18 and 19 .
  • the drawstring bag 1 is open at the bottom.
  • the drawstring bag 1 can be filled, for example, with cotton pads or other objects to be packaged through a lower opening 28, and after it has been completely filled, the lower end of the bag is closed, for example, by a lower weld seam.
  • the side walls 2, 3 consist of a thermoplastic plastic film material, for example a polyethylene, in particular LDPE.
  • the thermoplastic plastic film material enables the weld seams 6, 7, 13, 14 to be formed.
  • the drawstrings 24, 25 are made of a thermoplastic material which allows them to be welded together at the ends, for example polyethylene, in particular HDPE. Preference is given to synthetic materials that can be recycled together with the film material without prior separation.
  • the drawstrings 24, 25 can in particular be formed from plastic threads or plastic strips, with each drawstring being able to be only a single plastic thread or can consist of several plastic threads twisted together.
  • the drawstring bag 1 is formed from a single, quasi-endless web-like plastic film material 29 .
  • two series 30, 31 of circular punched-out portions 32, 33 are present therein at regular intervals.
  • the plastic film material has holes 34 for positioning the bags on a bag filling system.
  • the areas adjoining the outside of the lines 35, 38 furthest apart form the side walls 2, 3.
  • the end walls 16 are formed between the two lines 35, 36.
  • the welding and separating seams 39, 40 on the two lateral edges 4, 5 of the side walls 2, 3 are shown as dotted lines, which run perpendicular to the running direction L of the plastic film material 29.
  • the two middle parts of the plastic sheet material 29 are folded against each other and the parts outside the outer fold lines 35, 38 from the outside against the folded middle parts.
  • the parts of the plastic film material 29 are welded together and separated from one another at the welding separation seams 39, 40. There is no welding and separation within the punched-out areas 32, 33.
  • the drawstrings 24, 25 are pulled slightly out of the ends of the drawstring hems 18, 19 of the severed drawstring bags 1 and adjacent ends are welded or otherwise connected together.
  • the 4 shows a sheet-like plastic film material 29 for forming alternative drawstring bags 1.
  • the recesses 20, 21 are designed as slots.
  • Each slit has a certain width in the running direction L of the plastic film material, as a result of which it is distinguished by a simple cut through the plastic film material 29 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP21174329.9A 2021-05-18 2021-05-18 Sachet à cordon d'une matière de film plastique thermoplastique Pending EP4091963A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21174329.9A EP4091963A1 (fr) 2021-05-18 2021-05-18 Sachet à cordon d'une matière de film plastique thermoplastique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21174329.9A EP4091963A1 (fr) 2021-05-18 2021-05-18 Sachet à cordon d'une matière de film plastique thermoplastique

Publications (1)

Publication Number Publication Date
EP4091963A1 true EP4091963A1 (fr) 2022-11-23

Family

ID=76325328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21174329.9A Pending EP4091963A1 (fr) 2021-05-18 2021-05-18 Sachet à cordon d'une matière de film plastique thermoplastique

Country Status (1)

Country Link
EP (1) EP4091963A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4434912A1 (fr) * 2023-03-24 2024-09-25 Cofresco Frischhalteprodukte GmbH & Co. KG Sac avec bande, bande de sac et procédé de fabrication d'un sac

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053652A (en) * 1962-05-18 1967-01-04 Bags made of flexible plastic
DE8634032U1 (de) * 1986-12-19 1987-03-05 Stiegler GmbH Maschinenfabrik, 7062 Rudersberg Sack bzw. Beutel aus thermoplastischer Kunststoffolie mit einem Zugband
DE4244024A1 (de) 1992-12-24 1994-09-01 Alfons Meyer Kordelzugbeutel und Verfahren und Vorrichtung zu dessen Herstellung
DE20110350U1 (de) * 2001-06-22 2001-09-13 Melitta Haushaltsprodukte GmbH & Co. KG, 32427 Minden Beutel
WO2001089947A1 (fr) * 2000-05-22 2001-11-29 Pactiv Corporation Sacs elastomeres non bloquant
EP1232954A1 (fr) * 2001-01-24 2002-08-21 SP Metal Chaine de sacs à lien coulissant et son procédé de fabrication
WO2006097104A2 (fr) * 2005-03-15 2006-09-21 Etradan Bs Aps Sac a couture de connexion formant des courbes renforcees
EP1764067A1 (fr) * 2005-09-16 2007-03-21 The Procter & Gamble Company Emballage du type à refermeture pour des articles absorbants
US20090052811A1 (en) * 2007-08-22 2009-02-26 Moreau Darrell A Plastic bag with non-metallic closure
DE202019005520U1 (de) 2019-09-23 2020-11-05 Peku Folien Gmbh Wiederverschließbare Folienverpackung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053652A (en) * 1962-05-18 1967-01-04 Bags made of flexible plastic
DE8634032U1 (de) * 1986-12-19 1987-03-05 Stiegler GmbH Maschinenfabrik, 7062 Rudersberg Sack bzw. Beutel aus thermoplastischer Kunststoffolie mit einem Zugband
DE4244024A1 (de) 1992-12-24 1994-09-01 Alfons Meyer Kordelzugbeutel und Verfahren und Vorrichtung zu dessen Herstellung
WO2001089947A1 (fr) * 2000-05-22 2001-11-29 Pactiv Corporation Sacs elastomeres non bloquant
EP1232954A1 (fr) * 2001-01-24 2002-08-21 SP Metal Chaine de sacs à lien coulissant et son procédé de fabrication
DE20110350U1 (de) * 2001-06-22 2001-09-13 Melitta Haushaltsprodukte GmbH & Co. KG, 32427 Minden Beutel
WO2006097104A2 (fr) * 2005-03-15 2006-09-21 Etradan Bs Aps Sac a couture de connexion formant des courbes renforcees
EP1764067A1 (fr) * 2005-09-16 2007-03-21 The Procter & Gamble Company Emballage du type à refermeture pour des articles absorbants
US20090052811A1 (en) * 2007-08-22 2009-02-26 Moreau Darrell A Plastic bag with non-metallic closure
DE202019005520U1 (de) 2019-09-23 2020-11-05 Peku Folien Gmbh Wiederverschließbare Folienverpackung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4434912A1 (fr) * 2023-03-24 2024-09-25 Cofresco Frischhalteprodukte GmbH & Co. KG Sac avec bande, bande de sac et procédé de fabrication d'un sac

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