CA2452363A1 - Reclosable fasteners for plastics bags and the like - Google Patents
Reclosable fasteners for plastics bags and the like Download PDFInfo
- Publication number
- CA2452363A1 CA2452363A1 CA002452363A CA2452363A CA2452363A1 CA 2452363 A1 CA2452363 A1 CA 2452363A1 CA 002452363 A CA002452363 A CA 002452363A CA 2452363 A CA2452363 A CA 2452363A CA 2452363 A1 CA2452363 A1 CA 2452363A1
- Authority
- CA
- Canada
- Prior art keywords
- base
- convexities
- reclosable fastener
- flanges
- flange
- 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.)
- Abandoned
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
- Making Paper Articles (AREA)
- Slide Fasteners (AREA)
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~i.ppers 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.
Summery 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 member, 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 mufti-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 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 IO 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 hut at a margin of the base~l7, 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. In the co-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 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 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 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 440 of the overall thickness of the flange 18 at this zone.
The dimensions are summarised as follows:
Length of sealant layer ....................... 3.OOOmm Thickness of sealant layer ..................... 0.070mm Thickness of convexities ....................... 0.070mm Length of outer end 33 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 mufti-flanged zipper, one or more of the two, three or four flanges may be provided with the two shallow, sealant-constraining convexities.
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~i.ppers 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.
Summery 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 member, 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 mufti-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 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 IO 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 hut at a margin of the base~l7, 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. In the co-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 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 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 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 440 of the overall thickness of the flange 18 at this zone.
The dimensions are summarised as follows:
Length of sealant layer ....................... 3.OOOmm Thickness of sealant layer ..................... 0.070mm Thickness of convexities ....................... 0.070mm Length of outer end 33 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 mufti-flanged zipper, one or more of the two, three or four flanges may be provided with the two shallow, sealant-constraining convexities.
Claims (12)
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 zone s to the zone ends.
Applications Claiming Priority (3)
| 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 |
| PCT/GB2002/003044 WO2003003871A1 (en) | 2001-07-03 | 2002-07-02 | Reclosable fasteners for plastics bags and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2452363A1 true CA2452363A1 (en) | 2003-01-16 |
Family
ID=9917817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002452363A Abandoned CA2452363A1 (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) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20060093242A1 (en) * | 2004-07-21 | 2006-05-04 | Anzini David J | 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 |
| 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 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2058609B (en) * | 1979-09-13 | 1983-11-09 | Roeder Ind Holdings | Profiled plastics bag closure strip and adhesive bonding method |
| FR2589437B1 (en) * | 1985-11-04 | 1988-06-10 | Flexico France Sarl | CONNECTION DEVICE BETWEEN TWO SHEETS OF PLASTIC MATERIAL; BAG EQUIPPED, FOR CLOSING SAME, WITH SUCH A DEVICE |
| US4835835A (en) * | 1986-08-08 | 1989-06-06 | Minigrip, Inc. | Method and apparatus for making extruded separable fastener with reactivatable adhesive |
| US5628566A (en) * | 1996-01-29 | 1997-05-13 | Reynolds Consumer Products, Inc. | Profile sealing flange |
| US5655273A (en) * | 1996-04-18 | 1997-08-12 | Reynolds Consumer Products, Inc. | Minimal curl 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 |
-
2001
- 2001-07-03 GB GBGB0116194.2A patent/GB0116194D0/en not_active Ceased
-
2002
- 2002-07-02 CA CA002452363A patent/CA2452363A1/en not_active Abandoned
- 2002-07-02 GB GB0400296A patent/GB2392953B/en not_active Expired - Fee Related
- 2002-07-02 EP EP02747555A patent/EP1401303A1/en not_active Withdrawn
- 2002-07-02 WO PCT/GB2002/003044 patent/WO2003003871A1/en not_active Application Discontinuation
- 2002-07-02 US US10/482,338 patent/US20040148744A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB2392953B (en) | 2005-02-16 |
| GB0116194D0 (en) | 2001-08-22 |
| GB0400296D0 (en) | 2004-02-11 |
| GB2392953A (en) | 2004-03-17 |
| EP1401303A1 (en) | 2004-03-31 |
| WO2003003871A1 (en) | 2003-01-16 |
| US20040148744A1 (en) | 2004-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |