WO2009064549A1 - End stops for zippers for reclosable packages - Google Patents

End stops for zippers for reclosable packages Download PDF

Info

Publication number
WO2009064549A1
WO2009064549A1 PCT/US2008/078928 US2008078928W WO2009064549A1 WO 2009064549 A1 WO2009064549 A1 WO 2009064549A1 US 2008078928 W US2008078928 W US 2008078928W WO 2009064549 A1 WO2009064549 A1 WO 2009064549A1
Authority
WO
WIPO (PCT)
Prior art keywords
zipper
indentation
glue
interlocking
protrusion
Prior art date
Application number
PCT/US2008/078928
Other languages
French (fr)
Other versions
WO2009064549A9 (en
Inventor
Per Bentsen
Original Assignee
Illinois Tool Works Inc.
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 Illinois Tool Works Inc. filed Critical Illinois Tool Works Inc.
Publication of WO2009064549A1 publication Critical patent/WO2009064549A1/en
Publication of WO2009064549A9 publication Critical patent/WO2009064549A9/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
    • B65D33/2589—Bag or slide fastener details cooperating with the slider, e.g. details for removing or installing the slider
    • B65D33/259—End stops
    • 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
    • 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
    • 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
    • Y10T24/2598—Zipper or required component thereof including means for obstructing movement of slider

Definitions

  • the present invention relates to the formation of end stops for zippers for reclosable packages or bags, particularly end stops which include a seated formation of glue to increase the strength thereof.
  • an end stop with a formation of glue extending from the zipper profile, wherein the glue is inserted into an indentation, notch or cavity formed in the zipper profile by an ultrasonic horn.
  • Figure 1 is a plan view of a prior art end stop for a reclosable zipper, shown with a fragmentary view of the reclosable zipper and the reclosable package.
  • Figure 2 is a plan view of the end stop of the present invention.
  • Figure 3 is a cross-sectional view along plane 3-3 in Figure 2.
  • Figure 4 is a cross-sectional view similar to Figure 3, illustrating the formation of the indentation into which the dot of glue is seated.
  • Figure 1 is a plan view of a prior art end stop 10 at the end of zipper 12.
  • Zipper 12 is formed from polymeric material or similar material as would be known to those skilled in the art.
  • Zipper 12 includes first and second interlocking profiles 14, 16 which are joined or fused (typically ultrasonically) together at both ends by an end stop 10 (only one end is illustrated in Figure 2).
  • Zipper 12 further includes a slider 18 which separates the first and second interlocking profiles 14, 16 when moved in an opening direction and which interlocks the first and second profiles 14, 16 when moved in a closing direction.
  • First and second profiles 14, 16 include respective first and second flanges which are sealed to respective first and second sheets of polymeric material 20, 22 which form the walls of the reclosable package 40.
  • This prior art end stop 10 includes a raised portion 11 extending above zipper 12, formed from the material of the first and second profiles 14, 16 and shaped in the upwardly rising shape by an ultrasonic horn (not shown). The prior art configuration, in many applications, will typically resist a 15 pound pull-off force on the slider, although this number may vary with specific configuration.
  • Figures 2 and 3 are respective plan and cross-sectional views of the end stop 100 and zipper 102 (likewise formed from polymeric or similar material) of the present invention.
  • first and second zipper profiles 104, 106 of zipper 102 are shown in the sealed together configuration of end stop 100 and include respective first and second flanges 105, 107 for attachment to the walls of the reclosable package or bag.
  • End stop 100 is similarly formed at both ends of the zipper 102 wherein first and second zipper profiles 104, 106 are sealed together.
  • an indentation 108 is formed by the ultrasonic horn on the face of first zipper profile 104.
  • This indentation 108 typically extends from an outer edge 109 of the end stop 100 through a substantial portion of the length of the end stop and is typically formed during the same ultrasonic welding step that seals first and second zipper profiles 104, 106 together in the area of end stop 100 and that further forms the upwardly extending portion 110 of end stop 100.
  • a dot or "glob" of glue 112 is typically at least partially ovoid or hemispherically shaped (other possible shapes, of course, are envisioned), bonds itself into indentation 108 and extends laterally as a protrusion from first zipper profile 104.
  • the extent of the protrusion of dot or "glob” of glue 112 is typically substantially equal in distance to the width (as measured vertically in the orientation of Figure 2) of indentation 108. It has been found that hot melt glue is a highly satisfactory glue for this purpose. Additionally, it has been found that using an indentation with a horizontal extent (in the orientation of Figure 2) greater than the diameter of the dot or "glob” of glue 112 allows for variation, and reduces the need for precision, in the placement of the dot or "glob” of glue 112 during the manufacturing process.
  • This configuration is envisioned to resist an increased pull-off force on the slider with respect to the prior art configurations.
  • a typical configuration of the present invention is envisioned to resist a 20 pound pull-off force on the slider, although this number, as with the number associated with the prior art, may vary with specific configuration.
  • FIG 4 illustrates ultrasonic welding elements 202, 204 (one or both of which may be movable) impressing against the zipper 102 in order to form end stop 100.
  • Ultrasonic welding elements 202, 204 seal first and second zipper profiles 104, 106 together and form the upwardly extending portion 110 in a single step. Additionally, in this single step, ultrasonic welding element 202 includes protrusion 206 which forms indentation 108 into which the dot or "glob" of glue 112 is subsequently seated.

Abstract

The end stop (100) is formed on ends of a zipper (102) for a reclosable package or bag by ultrasonically welding the ends of the zipper profiles (104,106) together so as to form a raised portion (110). This prevents the slider (18) from being pulled off of the ends of the zipper (102). Additionally, in the ultrasonic welding step, an indentation (108) is formed into which glue (112) is added thereby forming a lateral protrusion on the side of a zipper profile (106). This increases the strength of the end stop (100) and increases the slider pull-off force which can be resisted.

Description

END STOPS FOR ZIPPERS FOR RECLOSABLE PACKAGES
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to the formation of end stops for zippers for reclosable packages or bags, particularly end stops which include a seated formation of glue to increase the strength thereof.
Description of the Prior Art
The prior art of reclosable packages is well-developed and generally suitable for its intended purposes. It is well-known in this prior art to provide slider-operated zippers for the reclosable packages, and to form end stops on the zippers to limit the extent of the travel of the slider. This prevents the slider from being moved beyond the end of the zipper and removed from the zipper. A typical end stop which includes an ultrasonically- formed raised portion, such as illustrated in Figure 1, may have a maximum slider pull- off force of fifteen pounds. The use of glue to form end stops is disclosed in U.S. patent application serial number 11/405,786, entitled "High Strength Slider End Stop", filed on April 18, 2006 by the present inventor. Other prior art relating to end stops for slider- operated zippers for reclosable packages includes U.S. Patent No. 6,569,368 entitled "Method for Manufacturing a Plastic Zipper with End Stops", issued on May 27, 2003 to Machacek; U.S. Patent No. 6,470,551 entitled "Method of Making a Fastener Arrangement with Notches at Spaced Preseals", issued on October 29, 2002 to Provan et al.; and U.S. Patent No. 6,846,107 entitled "Glue Drop End Stops for Zippered Bag", issued on January 25, 2005 to Sweeney et al.
OBJECTS AND SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide improvements in end stops for slider-operated zippers for reclosable packages or bags.
It is therefore a further object of the present invention to provide improvements in end stops formed with glue, particularly to be able to withstand a slider pull-off force of at least twenty pounds.
These and other objects are attained by providing an end stop with a formation of glue extending from the zipper profile, wherein the glue is inserted into an indentation, notch or cavity formed in the zipper profile by an ultrasonic horn.
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects and advantages of the invention will become apparent from the following description and from the accompanying drawings and claims, wherein:
Figure 1 is a plan view of a prior art end stop for a reclosable zipper, shown with a fragmentary view of the reclosable zipper and the reclosable package.
Figure 2 is a plan view of the end stop of the present invention.
Figure 3 is a cross-sectional view along plane 3-3 in Figure 2.
Figure 4 is a cross-sectional view similar to Figure 3, illustrating the formation of the indentation into which the dot of glue is seated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings in detail wherein like numerals indicate like elements throughout the several views, one sees that Figure 1 is a plan view of a prior art end stop 10 at the end of zipper 12. Zipper 12 is formed from polymeric material or similar material as would be known to those skilled in the art. Zipper 12 includes first and second interlocking profiles 14, 16 which are joined or fused (typically ultrasonically) together at both ends by an end stop 10 (only one end is illustrated in Figure 2). Zipper 12 further includes a slider 18 which separates the first and second interlocking profiles 14, 16 when moved in an opening direction and which interlocks the first and second profiles 14, 16 when moved in a closing direction. First and second profiles 14, 16 include respective first and second flanges which are sealed to respective first and second sheets of polymeric material 20, 22 which form the walls of the reclosable package 40. This prior art end stop 10 includes a raised portion 11 extending above zipper 12, formed from the material of the first and second profiles 14, 16 and shaped in the upwardly rising shape by an ultrasonic horn (not shown). The prior art configuration, in many applications, will typically resist a 15 pound pull-off force on the slider, although this number may vary with specific configuration.
Figures 2 and 3 are respective plan and cross-sectional views of the end stop 100 and zipper 102 (likewise formed from polymeric or similar material) of the present invention. As shown in Figure 3, first and second zipper profiles 104, 106 of zipper 102 are shown in the sealed together configuration of end stop 100 and include respective first and second flanges 105, 107 for attachment to the walls of the reclosable package or bag. End stop 100 is similarly formed at both ends of the zipper 102 wherein first and second zipper profiles 104, 106 are sealed together. However, as shown in Figures 2 and 3, an indentation 108 is formed by the ultrasonic horn on the face of first zipper profile 104. This indentation 108 typically extends from an outer edge 109 of the end stop 100 through a substantial portion of the length of the end stop and is typically formed during the same ultrasonic welding step that seals first and second zipper profiles 104, 106 together in the area of end stop 100 and that further forms the upwardly extending portion 110 of end stop 100. A dot or "glob" of glue 112 is typically at least partially ovoid or hemispherically shaped (other possible shapes, of course, are envisioned), bonds itself into indentation 108 and extends laterally as a protrusion from first zipper profile 104. The extent of the protrusion of dot or "glob" of glue 112 is typically substantially equal in distance to the width (as measured vertically in the orientation of Figure 2) of indentation 108. It has been found that hot melt glue is a highly satisfactory glue for this purpose. Additionally, it has been found that using an indentation with a horizontal extent (in the orientation of Figure 2) greater than the diameter of the dot or "glob" of glue 112 allows for variation, and reduces the need for precision, in the placement of the dot or "glob" of glue 112 during the manufacturing process. This configuration is envisioned to resist an increased pull-off force on the slider with respect to the prior art configurations. A typical configuration of the present invention is envisioned to resist a 20 pound pull-off force on the slider, although this number, as with the number associated with the prior art, may vary with specific configuration.
Figure 4 illustrates ultrasonic welding elements 202, 204 (one or both of which may be movable) impressing against the zipper 102 in order to form end stop 100. Ultrasonic welding elements 202, 204 seal first and second zipper profiles 104, 106 together and form the upwardly extending portion 110 in a single step. Additionally, in this single step, ultrasonic welding element 202 includes protrusion 206 which forms indentation 108 into which the dot or "glob" of glue 112 is subsequently seated.
Thus the several aforementioned objects and advantages are most effectively attained. Although preferred embodiments of the invention have been disclosed and described in detail herein, it should be understood that this invention is in no sense limited thereby and its scope is to be determined by that of the appended claims.

Claims

What is Claimed is:
1. A zipper for a reclosable package or bag, comprising: a first interlocking profile and a second interlocking profile, wherein the first interlocking profile includes an indentation on a side thereof; and end stops formed at ends of the zipper by joining respective ends of the first and second interlocking profiles, the end stops further including a protrusion of glue in the indentation and extending laterally from the side of the first interlocking profile.
2. The zipper of Claim 1 further including a slider mounted on the first and second interlocking profiles.
3. The zipper of Claim 2 wherein the slider interlocks the first and second interlocking profiles when moved in a closing direction and separates the first and second interlocking profiles when moved in an opening direction.
4. The zipper of Claim 1 wherein the protrusion of glue is at least partially ovoid shaped.
5. The zipper of Claim 1 wherein the protrusion of glue is bonded into the indentation. indentation.
7. The zipper of Claim 1 wherein the indentation has a generally rectangular shape.
8. The zipper of Claim 7 wherein the protrusion of glue extends a lateral distance which is substantially equal to a height of the indentation
9. The zipper of Claim 1 wherein the indentation is formed ultrasonically.
10. The zipper of Claim 9 wherein the end stops include a portion rising above the zipper.
11. The zipper of Claim 10 wherein the portion rising above the zipper is formed from material of the zipper.
12. The zipper of Claim 11 wherein the portion rising above the zipper is formed ultrasonically.
13. The zipper of Claim 12 wherein the respective ends of the first and second interlocking profiles are joined ultrasonically.
14. The zipper of Claim 13 wherein the indentation, the portion rising above the zipper, and the joining the respective ends of the first and second interlocking profiles are formed by a single ultrasonic welding step.
15. The zipper of Claim 1 wherein the first and second interlocking profiles include respective first and second flanges.
16. The zipper of Claim 15 wherein the first and second flanges are constructed and arranged for attachment to package or bag walls of polymeric material.
17. The zipper of Claim 1 wherein the zipper is formed from polymeric material.
18. The zipper of Claim 1 wherein the protrusion of glue is formed from hot melt glue.
19. The zipper of Claim 1 wherein the end stop can withstand a slider pull-off force of at least 20 pounds.
20. The zipper of Claim 1 wherein the second interlocking profile is free of a protrusion of glue.
PCT/US2008/078928 2007-10-10 2008-10-06 End stops for zippers for reclosable packages WO2009064549A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/973,703 2007-10-10
US11/973,703 US7882603B2 (en) 2007-10-10 2007-10-10 End stops for zippers for reclosable packages

Publications (2)

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WO2009064549A1 true WO2009064549A1 (en) 2009-05-22
WO2009064549A9 WO2009064549A9 (en) 2010-05-06

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PCT/US2008/078928 WO2009064549A1 (en) 2007-10-10 2008-10-06 End stops for zippers for reclosable packages

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8021048B2 (en) * 2009-02-02 2011-09-20 S.C. Johnson Home Storage, Inc. End-stomp and closure mechanism for a reclosable pouch
US20110185680A1 (en) * 2009-10-08 2011-08-04 Illinois Tool Works Inc. Adding mass to slider end stomps with ultrasonics in a reclosable package
US9878828B2 (en) 2014-06-20 2018-01-30 S. C. Johnson & Son, Inc. Slider bag with a detent

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1364768A2 (en) * 2002-05-17 2003-11-26 Illinois Tool Works Inc. Method and apparatus for forming zipper end stops
US20040014579A1 (en) * 2002-07-19 2004-01-22 Gerald Sweeney Glue drop end stops for zippered bag
US20070177827A1 (en) * 2006-01-30 2007-08-02 Reynolds Consumer Products, Inc. Slider end stop for a reclosable bag and methods

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6470551B1 (en) 2000-08-10 2002-10-29 Pactiv Corporation Method of making a fasteners arrangement with notches at spaced preseals
US6569368B2 (en) 2001-07-31 2003-05-27 Illinois Tool Works Inc. Method for manufacturing a plastic zipper with end stops
US20070240288A1 (en) * 2006-04-18 2007-10-18 Illinois Tool Works Inc. High strength slider end stop

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1364768A2 (en) * 2002-05-17 2003-11-26 Illinois Tool Works Inc. Method and apparatus for forming zipper end stops
US20040014579A1 (en) * 2002-07-19 2004-01-22 Gerald Sweeney Glue drop end stops for zippered bag
US20070177827A1 (en) * 2006-01-30 2007-08-02 Reynolds Consumer Products, Inc. Slider end stop for a reclosable bag and methods

Also Published As

Publication number Publication date
US7882603B2 (en) 2011-02-08
WO2009064549A9 (en) 2010-05-06
US20090094803A1 (en) 2009-04-16

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