WO2009015113A2 - Method to accurately control size, velocity, and relative position sets of reclosable mechanism - Google Patents

Method to accurately control size, velocity, and relative position sets of reclosable mechanism Download PDF

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Publication number
WO2009015113A2
WO2009015113A2 PCT/US2008/070702 US2008070702W WO2009015113A2 WO 2009015113 A2 WO2009015113 A2 WO 2009015113A2 US 2008070702 W US2008070702 W US 2008070702W WO 2009015113 A2 WO2009015113 A2 WO 2009015113A2
Authority
WO
WIPO (PCT)
Prior art keywords
extruder
zipper
film
reclosable
velocity
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.)
Ceased
Application number
PCT/US2008/070702
Other languages
French (fr)
Other versions
WO2009015113A3 (en
Inventor
Roy Kosub
Victor Matias
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.)
Illinois Tool Works Inc
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 WO2009015113A2 publication Critical patent/WO2009015113A2/en
Publication of WO2009015113A3 publication Critical patent/WO2009015113A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D5/00—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners
    • B29D5/10—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners the interlocking members being formed by continuous profiled strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
    • B29C48/1472—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at the die nozzle exit zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations

Definitions

  • the present invention relates to a manufacturing method to control the size velocity and relative position of a reclosable mechanism or multiple reclosable mechanisms, such as a zipper or zippers on a flexible plastic film, bag or pouch.
  • the resin for the profile interlocking elements is delivered from a co- extruder through a separate channel, or several separate channels, to the die body and thence to the die plate, where the resin is joined to the film (tubing) at a controlled rate, with the control being the speed of the co-extruder drive.
  • Figure 1 is a schematic of the apparatus of the present invention.
  • Figures 2a-2i are examples of zipper profiles which can be produced by the apparatus of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Extrusion die body 12 receives the material for the formation of the tubing (e.g. a tube or a film), such as, but not limited to, low density polyethylene, from primary extruder 14 and extruder material hopper 16 via supply channel 18.
  • Supply channel 18 joins extrusion die body primary supply channel 20 which is formed within extrusion die body 12.
  • Extrusion die body primary supply channel 20 in turns, feeds the material for the tubing to the extrusion die cavity 22 where the tube or film 100 is formed.
  • Tube or film 100 exits from the mouth 24 of extrusion die plate 13, and therefore may be referred to as tubing (or as a low density polyethylene bubble).
  • the tubing is typically drawn into a negative ratio and cooled. That is, due to the speed of the film and related factors, the circumference of the cooled and drawn finished tubing 100 is typically less than the circumference of the extrusion die plate 13, but in some applications may be the same size or even greater than the circumference of the extrusion die plate 13.
  • Secondary extruders 30, 34 include respective secondary extruder material hoppers 32, 36 supplying material, such as resin (which may be colored or uncolored), for the formation of the reclosable profiles.
  • material such as resin (which may be colored or uncolored), for the formation of the reclosable profiles.
  • the use of colored resin allows the user to see and handle the profiles more easily.
  • the resin, or similar material may be the same in secondary extruders 30, 34 or may be different (including such characteristics as color). It is envisioned, however, that the primary extruder 14 would supply a flexible, soft and pliable material while the secondary extruders 30, 34 would supply a more rigid, robust material for forming reclosable profiles 102, 104.
  • the resin, or similar material is provided via respective secondary supply channels 38, 40 (typically implemented as heated hoses) and respective secondary die body supply channels 42, 44 to the die plate, where it is joined to the tubing 100 at a controlled rate (as well as a controlled temperature), with the control being the speed of the drive of the secondary extruders 30, 34, thereby forming reclosable profiles 102, 104 on tubing 100.
  • the resin (or other material) from the secondary extruders 30, 34 for forming the reclosable profiles 102, 104 does not come into contact with the material (tube or film 100) from the primary extruder 14 until it reaches the extrusion die plate 13 typically approximately one half inch (although other distances are envisioned) before both exit the extrusion die body 12.
  • interlocking elements with separators between the interlocking elements can be provided; 8. the shapes, construction and structural characteristics of the interlocking elements are controlled, including profiles with multiple interlocking elements;
  • the tubing may have two or more sets of profiles, each set provided with separate sources of profile control; 10.
  • the separate resin source can be a co-extruder (or secondary extruder);
  • the profiles are provided with multiple interlocking elements
  • a co-extruder (or secondary extruder) can provide resin flows to several sets of profiles or a separate co-extruder (or secondary extruder) can be used for each resin flow;
  • the flow of resin to the profiles can be controlled, so that the profiles cool at a controlled rate
  • the speed of the profile extrusion can be controlled so that the speed of the profile extrusion and the speed of the film extrusion are equal when the profile and the film come into contact with each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The apparatus includes an extrusion die and further includes a main or primary extruder for the supply of material, such as low density polyethylene, to form the tubing for the manufacture of reclosable packages, bags or pouches. The apparatus further includes at least one secondary extruder, or co-extruder, for the extruding of each reclosable profile onto the tubing. The speed of the co-extruders is controlled so as to control the extrusion of the reclosable profiles.

Description

METHOD TO ACCURATELY CONTROL SIZE, VELOCITY, AND RELATIVE POSITION SETS OF RECLOSABLE MECHANISM
This application claims priority under 35 U.S. C. §119(e) of provisional application serial no. 60/961,752, filed on July 24, 2007.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a manufacturing method to control the size velocity and relative position of a reclosable mechanism or multiple reclosable mechanisms, such as a zipper or zippers on a flexible plastic film, bag or pouch.
Description of the Prior Art
In the prior art of the manufacture of zippers and similar devices for reclosable plastic film, bags or pouches, the velocity of the delivery of the resin to the profiles or to the locking elements could not be accurately controlled by such elements as a choke device. This inability to accurately control the resin velocity made it difficult to extrude complex locking mechanisms at a reasonable cost and production rate. Further prior art includes methods where the zipper tape is extruded, wound and then, in a secondary process, unwound, heated and attached to the film. Still further prior art may be found in published patent application US2005/0269733 Al entitled "Method of and Apparatus for Forming Multiple Closure Elements". OBJECTS AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method and apparatus for the manufacture of complex locking mechanisms for reclosable interlocking elements, such as a zipper profile on a flexible film plastic package, bag or pouch, at a reasonable cost and production rate.
It is therefore a further object of the present invention to provide accurate control of the velocity of the resin flow delivered to the profile at its point of juncture with the film or tubing of the reclosable plastic package, bag or pouch. It is therefore a still further object of the present invention to improve adhesion of closure elements to the body of the package, bag or pouch by preventing exposure of the contact surfaces.
These and other objects are attained by cooling the integral profile tubing and drawing it in a negative ratio whereby the circumference of the cooled and drawn finished tubing is less than the circumference of the die plate. The resin for the profile interlocking elements is delivered from a co- extruder through a separate channel, or several separate channels, to the die body and thence to the die plate, where the resin is joined to the film (tubing) at a controlled rate, with the control being the speed of the co-extruder drive.
DESCRIPTION OF THE DRAWINGS
Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein: Figure 1 is a schematic of the apparatus of the present invention.
Figures 2a-2i are examples of zipper profiles which can be produced by the apparatus of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in detail, wherein like numerals indicate like elements throughout the several views, one sees that Figure 1 is a schematic of the apparatus 10 of the present invention. Extrusion die body 12 receives the material for the formation of the tubing (e.g. a tube or a film), such as, but not limited to, low density polyethylene, from primary extruder 14 and extruder material hopper 16 via supply channel 18. Supply channel 18 joins extrusion die body primary supply channel 20 which is formed within extrusion die body 12. Extrusion die body primary supply channel 20, in turns, feeds the material for the tubing to the extrusion die cavity 22 where the tube or film 100 is formed. Tube or film 100, typically in a cylindrical shape, exits from the mouth 24 of extrusion die plate 13, and therefore may be referred to as tubing (or as a low density polyethylene bubble). The tubing is typically drawn into a negative ratio and cooled. That is, due to the speed of the film and related factors, the circumference of the cooled and drawn finished tubing 100 is typically less than the circumference of the extrusion die plate 13, but in some applications may be the same size or even greater than the circumference of the extrusion die plate 13.
Secondary extruders 30, 34 include respective secondary extruder material hoppers 32, 36 supplying material, such as resin (which may be colored or uncolored), for the formation of the reclosable profiles. The use of colored resin allows the user to see and handle the profiles more easily. The resin, or similar material, may be the same in secondary extruders 30, 34 or may be different (including such characteristics as color). It is envisioned, however, that the primary extruder 14 would supply a flexible, soft and pliable material while the secondary extruders 30, 34 would supply a more rigid, robust material for forming reclosable profiles 102, 104. The resin, or similar material, is provided via respective secondary supply channels 38, 40 (typically implemented as heated hoses) and respective secondary die body supply channels 42, 44 to the die plate, where it is joined to the tubing 100 at a controlled rate (as well as a controlled temperature), with the control being the speed of the drive of the secondary extruders 30, 34, thereby forming reclosable profiles 102, 104 on tubing 100. The resin (or other material) from the secondary extruders 30, 34 for forming the reclosable profiles 102, 104 does not come into contact with the material (tube or film 100) from the primary extruder 14 until it reaches the extrusion die plate 13 typically approximately one half inch (although other distances are envisioned) before both exit the extrusion die body 12. The control of the speed of the drive of the secondary extruders 30, 34 and or control of the temperature of the resin or similar material provided to the secondary supply channels 38, 40 (is, in turn, typically controlled by CPU 200 or a similar processing device) thereby provides the ability to extrude more complex shapes of the interlocking elements than was previously possible. Additionally, it is envisioned that as many as nine, or even more, secondary extruders may be used, with respective material supplies and secondary supply channels to form the various complex shapes. Figures 2a-2i are representative of a sample of the many profile shapes that are possible with various embodiments of the present invention which, applicant believes, have been difficult, if not impossible, to obtain with the prior art, particularly with respect to multiple interlocking elements formed on a single profile. The resulting configuration typically has many or all of the following advantages:
1. the velocity and speed of the resin for the locking mechanism is controlled separately from that of the tubing;
2. the velocity of the resin for the interlocking elements is controlled accurately and separately from that of the tubing;
3. the distance between sets of profiles is controlled;
4. more complex locking mechanisms may be manufactured;
5. the cooling rate of the interlocking elements is accurately controlled;
6. more complex multiple interlocking elements are possible;
7. interlocking elements with separators between the interlocking elements can be provided; 8. the shapes, construction and structural characteristics of the interlocking elements are controlled, including profiles with multiple interlocking elements;
9. the tubing may have two or more sets of profiles, each set provided with separate sources of profile control; 10. the separate resin source can be a co-extruder (or secondary extruder);
11. the profiles are provided with multiple interlocking elements;
12. a co-extruder (or secondary extruder) can provide resin flows to several sets of profiles or a separate co-extruder (or secondary extruder) can be used for each resin flow;
13. the flow of resin to the profiles can be controlled, so that the profiles cool at a controlled rate; and
14. the speed of the profile extrusion can be controlled so that the speed of the profile extrusion and the speed of the film extrusion are equal when the profile and the film come into contact with each other.
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

CLAIMSWhat is Claimed is:
1. An apparatus for producing film for reclosable packages, bags or pouches, comprising: a primary extruder; at least one secondary extruder; an extrusion die plate with a primary channel for receiving primary material from the primary extruder for forming a film; the extrusion die plate further including at least one secondary channel for receiving secondary material from the at least one secondary extruder for forming reclosable zipper profiles on the film; and a control device for controlling velocity of flow of the secondary material to provide desired shapes of the reclosable zipper profiles.
2. The apparatus of Claim 1 wherein the at least one secondary extruder includes at least two secondary extruders.
3. The apparatus of Claim 2 wherein the primary extruder provides low density polyethylene material.
4. The apparatus of Claim 1 wherein the at least one secondary extruder provides resin material.
5. The apparatus of Claim 2 wherein the secondary extruders include at least a first secondary extruder and a second secondary extruder, and the secondary material from the first secondary material is different from the secondary material from the second secondary extruder.
6. The apparatus of Claim 2 wherein the secondary extruders include at least a first secondary extruder and a second secondary extruder, and the secondary material from the first secondary material is the same as the secondary material from the second secondary extruder.
7. The apparatus of Claim 2 wherein a velocity of the film and the velocity of the secondary material are controlled so as to be equal when the secondary material and the film come into contact with each other.
8. The apparatus of Claim 1 wherein at least one heated hose connects the at least one secondary extruder to the extrusion die body.
9. The apparatus of Claim 2 wherein a temperature of the secondary material is controlled by the processing device.
10. The apparatus of Claim 1 wherein a speed of the film is controlled whereby a circumference of the film is less than a circumference of the extrusion die plate.
11. The apparatus of Claim 1 wherein the reclosable zipper profiles include a plurality of interlocking elements.
12. The apparatus of Claim 1 wherein the at least one secondary extruder provides colored secondary material.
13. The apparatus of Claim 1 wherein the control device controls velocity of flow of the secondary material whereby a distance between sets of profiles is controlled.
14. The apparatus of Claim 1 wherein the control device controls velocity of flow of the secondary material whereby separators are provided between the interlocking elements of the reclosable zipper profiles.
15. The apparatus of Claim 1 wherein the at least one secondary extruder can provide resin flows to a plurality of sets of reclosable zipper profiles.
16. A zipper for reclosable packages, bags or pouches, produced by a method comprising the following steps: providing a primary extruder; providing at least one secondary extruder; providing an extrusion die plate with a primary channel for receiving primary material from the primary extruder for forming a film, further including at least one secondary channel for receiving secondary material from the at least one secondary extruder for forming reclosable zipper profiles on the film; and providing a control device for controlling velocity of flow of the secondary material to provide desired shapes of the reclosable zipper profiles.
17. The zipper of Claim 16 wherein the at least one secondary extruder includes at least two secondary extruders.
18. The zipper of Claim 17 wherein the primary extruder provides low density polyethylene material.
19. The zipper of Claim 16 wherein the secondary extruders provide resin material.
20. The zipper of Claim 17 wherein the secondary extruders include at least a first secondary extruder and a second secondary extruder, and the secondary material from the first secondary material is different from the secondary material from the second secondary extruder.
21. The zipper of Claim 17 wherein the secondary extruders include at least a first secondary extruder and a second secondary extruder, and the secondary material from the first secondary material is the same as the secondary material from the second secondary extruder.
22. The zipper of Claim 17 wherein a velocity of the film and the velocity of the secondary material are controlled so as to be equal when the secondary material and the film come into contact with each other.
23. The zipper of Claim 16 wherein at least one heated hose connects the at least one secondary extruder to the extrusion die body.
24. The zipper of Claim 17 wherein a temperature of the secondary material is controlled by the processing device.
25. The zipper of Claim 16 wherein a speed of the film is controlled whereby a circumference of the film is less than a circumference of the extrusion die plate.
26. The zipper of Claim 16 wherein the reclosable zipper profiles include a plurality of interlocking elements.
27. The zipper of Claim 16 wherein the at least one secondary extruder provides colored secondary material.
28. The zipper of Claim 16 wherein the control device controls velocity of flow of the secondary material whereby a distance between sets of profiles is controlled. The zipper of Claim 16 wherein the control device controls velocity of flow of the secondary material whereby separators are provided between the interlocking elements of the reclosable zipper profiles.
29. The zipper of Claim 16 wherein the at least one secondary extruder can provide resin flows to a plurality of sets of reclosable zipper profiles.
PCT/US2008/070702 2007-07-24 2008-07-22 Method to accurately control size, velocity, and relative position sets of reclosable mechanism Ceased WO2009015113A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US96175207P 2007-07-24 2007-07-24
US60/961,752 2007-07-24
US12/218,418 US20090028469A1 (en) 2007-07-24 2008-07-15 Method to accurately control size, velocity, and relative position sets of reclosable mechanism
US12/218,418 2008-07-15

Publications (2)

Publication Number Publication Date
WO2009015113A2 true WO2009015113A2 (en) 2009-01-29
WO2009015113A3 WO2009015113A3 (en) 2009-12-23

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WO (1) WO2009015113A2 (en)

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US20110165280A1 (en) 2011-07-07
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