WO2003003871A1 - Reclosable fasteners for plastics bags and the like - Google Patents

Reclosable fasteners for plastics bags and the like Download PDF

Info

Publication number
WO2003003871A1
WO2003003871A1 PCT/GB2002/003044 GB0203044W WO03003871A1 WO 2003003871 A1 WO2003003871 A1 WO 2003003871A1 GB 0203044 W GB0203044 W GB 0203044W WO 03003871 A1 WO03003871 A1 WO 03003871A1
Authority
WO
WIPO (PCT)
Prior art keywords
base
convexities
reclosable fastener
flanges
flange
Prior art date
Application number
PCT/GB2002/003044
Other languages
French (fr)
Inventor
Martin John Charles Offa-Jones
Original Assignee
Supreme Plastics Holdings Limited
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 Supreme Plastics Holdings Limited filed Critical Supreme Plastics Holdings Limited
Priority to GB0400296A priority Critical patent/GB2392953B/en
Priority to EP02747555A priority patent/EP1401303A1/en
Priority to US10/482,338 priority patent/US20040148744A1/en
Priority to CA002452363A priority patent/CA2452363A1/en
Publication of WO2003003871A1 publication Critical patent/WO2003003871A1/en

Links

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
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2541—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/10—Slide fasteners with a one-piece interlocking member on each stringer tape
    • A44B19/16—Interlocking member having uniform section throughout the length of the stringer
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/25—Zipper or required component thereof
    • Y10T24/2532—Zipper or required component thereof having interlocking surface with continuous cross section
    • Y10T24/2534—Opposed interlocking surface having dissimilar cross section

Definitions

  • This invention relates to a closure strip or zipper for use as a reclosable fastener for plastics bags, pouches, etc. It is also concerned with methods of manufacturing such fasteners.
  • Such zippers comprise male and female profile elements located on a pair of opposed base members.
  • the base members are arranged to be bonded to a substrate, such as a film, in the manufacture of the reclosable bags, pouches, etc.
  • Each base member and its profiled element are co-extruded.
  • Such a zipper is usually flanged, i.e. with one or both of the base members extending laterally out beyond the region of the male/female closure.
  • a reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with one base being connected to a lateral flange, wherein said flange is provided with a pair of spaced, shallow convexities with a layer of sealant material co-extruded into the zone between the convexities.
  • a reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with at least two lateral flanges connected to one base or to the two bases, wherein one or more of said flanges is provided with a pair of spaced, shallow convexities with a layer of sealant co-extruded into the zone or zones between the convexities.
  • a method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with a lateral flange connected to one base and with a pair of spaced, shallow convexities proud of the flange, and co-extruding a layer of sealant material into the zone between the convexities.
  • a method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with at least two lateral flanges connected to one base or to the two bases, and with a pair of spaced, shallow convexities on one or more of said flanges, and co- extruding a layer of sealant material into the zone or zones between the convexities.
  • the sealant material does not fill the zone or zones right up to the zone ends.
  • pressure is applied in the sealing of the zipper to the film or web, there is therefore space into which the sealant material can travel, thereby reducing the risk of leakage.
  • this zone of infilled sealant material can be provided on some or all the flanges .
  • Fig. 1 is a shadowgraph of the zipper in accordance with the invention.
  • Fig. 2 is a schematic illustration giving typical dimensions for a flange of the zipper shown in Fig. 1.
  • Description of the preferred embodiment 5 Referring first to Fig. 1, this shows a zipper comprising a first profile member 10 having a male element 12 on a base 13 and a second profile member 14 having a female element 16 on a base 17.
  • the profile members 10, 14 can be extruded polymeric material, such as LDPE.
  • the 10 10 has two lateral flanges 18 and 20 extending from the base 13.
  • the second profile member 14 has two lateral flanges 22 and 24.
  • the second profile member 14 is connected to its flanges 22, 24 not centrally but at a margin of the base 17, thereby to provide a hinged link via a leg, 26.
  • Each of the flanges 18, 20, 22, 24 is provided with a pair of spaced, shallow convexities 28 formed from the material of the flange. Between the respective pairs of convexities 28 are infilled, co-extruded layers 30 of a sealant material, such as EVA for example.
  • the sealant material preferably does not wholly fill the zones between the convexities 28, but stops short of the zone ends and is slightly proud of the convexities. In this way, when heat and pressure is applied in the process of sealing the flanges to an adjoining 5 substrate, the sealant -material will be squeezed into the space left available, reducing in thickness to the depth of the convexities. Thus, leakage of sealant will be reduced or eliminated.
  • Fig. 2 shows flange 18 on an enlarged scale and 0 schematically.
  • the dimensions given in Fig. 2 are in millimetres. It will be noted that the convexities 28 are not both the same length; the one nearer the profile of the zipper is longer. However, they could be of the same length. Also, the thickness of the outer end 32 of the flange is less than 5 the thickness of the inner portion 34 of the flange. Again, these thicknesses could be the same, depending upon the extrusion process. The thickness of the sealant layer is 0.070mm. This is about 44% of the overall thickness of the flange 18 at this zone. The dimensions are summarised as follows:
  • the reclosable fastener or zipper is shown as having four flanges, the invention is equally applicable to a zipper having one, two or three flanges. In the case of a multi-flanged zipper, one or more of the two, three or four flanges may be provided with the two shallow, sealant-constraining convexities.

Abstract

A reclosable fastener or zipper comprises interengageable male and female profile members (12, 16), each provided on a base (13, 17). One or both vases is/are provided with a lateral flange (18, 20, 22, 24). One or more of such flanges is/are provided with a pair of spaced, shallow convexities (28) with a layer of sealant material (30) co-extruded into the zone or zones between the convexities.

Description

RECLOSABLE FASTENERS FOR PLASTICS BAGS AND THE LIKE Field of the invention
This invention relates to a closure strip or zipper for use as a reclosable fastener for plastics bags, pouches, etc. It is also concerned with methods of manufacturing such fasteners. Such zippers comprise male and female profile elements located on a pair of opposed base members. The base members are arranged to be bonded to a substrate, such as a film, in the manufacture of the reclosable bags, pouches, etc. Each base member and its profiled element are co-extruded. Such a zipper is usually flanged, i.e. with one or both of the base members extending laterally out beyond the region of the male/female closure.
It is known to provide zippers where an adhesive is provided on the flange or flanges, to aid in the welding of the flange or flanges to a substrate, i.e. a plastics film or web.
One of the ongoing objectives in the design of such z'ippers is to reduce the heat required to seal the flanges to the substrate material. Excessive heat is always a problem and the lower the sealing temperature the easier it is to produce an acceptable product.
Another objective is to avoid or at least minimise leakage of the adhesive material. Summary of the invention
It is an object of the present invention to seek to meet both these objectives.
In accordance with the invention there is provided a reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with one base being connected to a lateral flange, wherein said flange is provided with a pair of spaced, shallow convexities with a layer of sealant material co-extruded into the zone between the convexities. Also in accordance with the invention there is provided a reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with at least two lateral flanges connected to one base or to the two bases, wherein one or more of said flanges is provided with a pair of spaced, shallow convexities with a layer of sealant co-extruded into the zone or zones between the convexities.
Also in accordance with the invention there is provided a method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with a lateral flange connected to one base and with a pair of spaced, shallow convexities proud of the flange, and co-extruding a layer of sealant material into the zone between the convexities.
Also in accordance with the invention there is provided a method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with at least two lateral flanges connected to one base or to the two bases, and with a pair of spaced, shallow convexities on one or more of said flanges, and co- extruding a layer of sealant material into the zone or zones between the convexities.
Preferably, in the co-extrusion process, the sealant material does not fill the zone or zones right up to the zone ends. When pressure is applied in the sealing of the zipper to the film or web, there is therefore space into which the sealant material can travel, thereby reducing the risk of leakage.
In a multi-flanged zipper this zone of infilled sealant material can be provided on some or all the flanges . Brief description of the drawings
In order that the invention may be more fully understood, an embodiment of zipper in accordance with the invention will now be described by way of example and with reference to the accompanying drawings, in which: Fig. 1 is a shadowgraph of the zipper in accordance with the invention; and,
Fig. 2 is a schematic illustration giving typical dimensions for a flange of the zipper shown in Fig. 1. Description of the preferred embodiment 5 Referring first to Fig. 1, this shows a zipper comprising a first profile member 10 having a male element 12 on a base 13 and a second profile member 14 having a female element 16 on a base 17. The profile members 10, 14 can be extruded polymeric material, such as LDPE. The first profile member
10 10 has two lateral flanges 18 and 20 extending from the base 13. The second profile member 14 has two lateral flanges 22 and 24. The second profile member 14 is connected to its flanges 22, 24 not centrally but at a margin of the base 17, thereby to provide a hinged link via a leg, 26.
15 Each of the flanges 18, 20, 22, 24 is provided with a pair of spaced, shallow convexities 28 formed from the material of the flange. Between the respective pairs of convexities 28 are infilled, co-extruded layers 30 of a sealant material, such as EVA for example. In the co- 0 extrusion process, the sealant material preferably does not wholly fill the zones between the convexities 28, but stops short of the zone ends and is slightly proud of the convexities. In this way, when heat and pressure is applied in the process of sealing the flanges to an adjoining 5 substrate, the sealant -material will be squeezed into the space left available, reducing in thickness to the depth of the convexities. Thus, leakage of sealant will be reduced or eliminated.
Fig. 2 shows flange 18 on an enlarged scale and 0 schematically. The dimensions given in Fig. 2 are in millimetres. It will be noted that the convexities 28 are not both the same length; the one nearer the profile of the zipper is longer. However, they could be of the same length. Also, the thickness of the outer end 32 of the flange is less than 5 the thickness of the inner portion 34 of the flange. Again, these thicknesses could be the same, depending upon the extrusion process. The thickness of the sealant layer is 0.070mm. This is about 44% of the overall thickness of the flange 18 at this zone. The dimensions are summarised as follows:
Length of sealant layer 3.000mm
Thickness of sealant layer 0.070mm
Thickness of convexities 0.070mm
Length of outer end 32 of flange 0.500mm Thickness of outer end 32 of flange 0.110mm
Thickness of inner end 34 of flange 0.160mm
These dimensions are given by way of example only. Although in the illustrated embodiment the reclosable fastener or zipper is shown as having four flanges, the invention is equally applicable to a zipper having one, two or three flanges. In the case of a multi-flanged zipper, one or more of the two, three or four flanges may be provided with the two shallow, sealant-constraining convexities.

Claims

CLAIMS :
1. A reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with one base being connected to a lateral flange, wherein said flange is provided with a pair of spaced, shallow convexities with a layer of sealant material co-extruded into the zone between the convexities.
2. A reclosable fastener comprising interengageable male and female profile members, each provided on a base, and with at least two lateral flanges connected to one base or to the two bases, wherein one or more of said flanges is provided with a pair of spaced, shallow convexities with a layer of sealant co-extruded into the zone or zones between the convexities .
3. A reclosable fastener according to claim 2, in which each base is connected to two respective lateral flanges.
4. A reclosable fastener according to any preceding claim, in which the layer of sealant material is of the order of 3mm in lateral width.
5. A reclosable fastener according to any preceding claim, in which the layer of sealant material is of the order of 0.07mm in thickness.
6. A reclosable fastener according to any preceding claim, in which the thickness of the layer of sealant material is of the order of 44% of the combined thickness of the sealant and flange.
7. A reclosable fastener according to any preceding claim, in which the convexity which is nearer to the profile member has a greater lateral width than the convexity which is further from the profile member.
8. A reclosable fastener according to any preceding claim, in which the thickness of the flange or flanges is less outwardly of the outer convexity than inwardly of the inner convexity.
9. A reclosable fastener according to any preceding claim, in which one said base is connected by a hinge joint to a lateral flange or flanges.
10. A method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with a lateral flange connected to one base and with a pair of spaced, shallow convexities proud of the flange, and co-extruding a layer of sealant material into the zone between the convexities.
11. A method of extruding a reclosable fastener which comprises extruding a male profile member on a base and a female profile member on a base, with at least two lateral flanges connected to one base or to the two bases, and with a pair of spaced, shallow convexities on one or more of said flanges, and co-extruding a layer of sealant material into the zone or zones between the convexities.
12. A method according to claim 10 or 11, in which in the said co-extrusion process the sealant material does not fill the zone or zones to the zone ends.
PCT/GB2002/003044 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like WO2003003871A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB0400296A GB2392953B (en) 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like
EP02747555A EP1401303A1 (en) 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like
US10/482,338 US20040148744A1 (en) 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like
CA002452363A CA2452363A1 (en) 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0116194.2 2001-07-03
GBGB0116194.2A GB0116194D0 (en) 2001-07-03 2001-07-03 Reclosable fasteners for plastics bags and the like

Publications (1)

Publication Number Publication Date
WO2003003871A1 true WO2003003871A1 (en) 2003-01-16

Family

ID=9917817

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/003044 WO2003003871A1 (en) 2001-07-03 2002-07-02 Reclosable fasteners for plastics bags and the like

Country Status (5)

Country Link
US (1) US20040148744A1 (en)
EP (1) EP1401303A1 (en)
CA (1) CA2452363A1 (en)
GB (2) GB0116194D0 (en)
WO (1) WO2003003871A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1579780A2 (en) * 2004-03-25 2005-09-28 Reynolds Consumer Products, Inc. Teardrop sealant layer for profile and spacer areas for improved sealing and guiding
WO2007050690A1 (en) * 2005-10-25 2007-05-03 Illinois Tool Works Inc. Reclosable packages for vacuum, pressure and/or liquid containment
US7527585B2 (en) 2004-07-21 2009-05-05 Illinois Tool Works Inc. Methods of making reclosable packages for vacuum, pressure and/or liquid containment

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2942207B1 (en) * 2009-02-17 2011-03-18 S2F Flexico CLOSURE ASSEMBLY FOR PACKAGING BAGS AND SACHETS COMPRISING SUCH AN ASSEMBLY
US10582743B2 (en) 2016-03-21 2020-03-10 Delphini, Llc System and method for activated interlocking fasteners and seals

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354541A (en) * 1979-09-13 1982-10-19 Minigrip, Inc. Profiled plastics bag closure strip and adhesive bonding method
US4672723A (en) * 1985-11-04 1987-06-16 Minigrip, Inc. Stabilized reclosable extruded plastic fasteners
US4835835A (en) * 1986-08-08 1989-06-06 Minigrip, Inc. Method and apparatus for making extruded separable fastener with reactivatable adhesive
US5655273A (en) * 1996-04-18 1997-08-12 Reynolds Consumer Products, Inc. Minimal curl sealing flange

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5628566A (en) * 1996-01-29 1997-05-13 Reynolds Consumer Products, Inc. Profile sealing flange
US6361211B1 (en) * 1998-01-16 2002-03-26 Reynolds Metal Company Closure mechanism with a heat-insulating filler
US6065872A (en) * 1999-02-04 2000-05-23 Illinois Tool Works Inc. Pinch and pull open reclosable bag and zipper therefor
US7101079B2 (en) * 1999-05-11 2006-09-05 Sargento Foods, Inc. Resealable bag for filling with food product(s) and method
US6481890B1 (en) * 2001-07-16 2002-11-19 Reynolds Consumer Products, Inc. Reclosable zipper having intermittent thickened flange; package; and methods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354541A (en) * 1979-09-13 1982-10-19 Minigrip, Inc. Profiled plastics bag closure strip and adhesive bonding method
US4672723A (en) * 1985-11-04 1987-06-16 Minigrip, Inc. Stabilized reclosable extruded plastic fasteners
US4835835A (en) * 1986-08-08 1989-06-06 Minigrip, Inc. Method and apparatus for making extruded separable fastener with reactivatable adhesive
US5655273A (en) * 1996-04-18 1997-08-12 Reynolds Consumer Products, Inc. Minimal curl sealing flange

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1579780A2 (en) * 2004-03-25 2005-09-28 Reynolds Consumer Products, Inc. Teardrop sealant layer for profile and spacer areas for improved sealing and guiding
EP1579780A3 (en) * 2004-03-25 2006-11-02 Reynolds Consumer Products, Inc. Teardrop sealant layer for profile and spacer areas for improved sealing and guiding
US7216405B2 (en) 2004-03-25 2007-05-15 Reynolds Consumer Products, Inc. Teardrop sealant layer for profile and spacer areas for improved sealing and guiding
US7527585B2 (en) 2004-07-21 2009-05-05 Illinois Tool Works Inc. Methods of making reclosable packages for vacuum, pressure and/or liquid containment
WO2007050690A1 (en) * 2005-10-25 2007-05-03 Illinois Tool Works Inc. Reclosable packages for vacuum, pressure and/or liquid containment
CN101312889B (en) * 2005-10-25 2010-11-03 伊利诺斯工具制品有限公司 Reclosable packages for vacuum, pressure and/or liquid containment

Also Published As

Publication number Publication date
GB0116194D0 (en) 2001-08-22
GB2392953B (en) 2005-02-16
CA2452363A1 (en) 2003-01-16
GB0400296D0 (en) 2004-02-11
EP1401303A1 (en) 2004-03-31
GB2392953A (en) 2004-03-17
US20040148744A1 (en) 2004-08-05

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