NETTING, ARRAYS, AND DIES, AND METHODS OF MAKING THE SAME

• US 20140234606A1
• Filed: 08/21/2012
• Published: 08/21/2014
• Est. Priority Date: 08/22/2011
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Ausen, Ronald W., Diekmann, Timothy J., Hanschen, Thomas P., Kopecky, William J., Wang, Shou-Lu
• Application Number:
  US14/240,062
• Publication Number:
  US 20140234606A1
• Time in Patent Office: Days
• US Class Current: 428/220
• CPC Class Codes: B29C 48/0021 combined with joining, lining or laminating
• CPC Class Codes: B29C 48/05 Filamentary, e.g. strands
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/3001 characterised by the material or their manufacturing process
• CPC Class Codes: B29C 48/305 having a wide opening, e.g. for forming sheets
• CPC Class Codes: B29C 48/345 Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
• CPC Class Codes: B29D 28/00 Producing nets or the like, e.g. meshes, latticesby knotting D04G
• CPC Class Codes: B29L 2028/00 Nets or the like
• CPC Class Codes: D01D 4/02 Spinnerettes alloys therefor C22C

Abstract

Nettings and arrays comprising polymeric strands, including dies (1030) and methods to make the same. Nettings and arrays of polymeric strands (1070a,1070b) described herein have a variety of uses, including wound care, tapes, filtration, absorbent articles, pest control articles, geotextile applications, water/vapor management in clothing, reinforcement for non-woven articles, self bulking articles, floor coverings, grip supports, athletic articles, and pattern-coated adhesives.

Claims

1. A netting comprising an array of polymeric strands periodically joined together at bond regions throughout the array, but do not substantially cross over each other, wherein the netting has a thickness up to 750 micrometers.

2. An article comprising two nettings of claim 1 with a ribbon region disposed there between.

3. An article comprising the netting of claim 1 disposed between two ribbon regions.

4. A method of making the netting of claim 1, the method comprising one of Method I or Method II:

Method I

providing an extrusion die comprising a plurality of shims positioned adjacent to one another, the shims together defining a cavity, the extrusion die having a plurality of first dispensing orifices in fluid communication with the cavity and a plurality of second dispensing orifices in fluid communication with the cavity, such that the first and second dispensing orifices are alternated; and

dispensing first polymeric strands from the first dispensing orifices at a first strand speed while simultaneously dispensing second polymeric strands from the second dispensing orifices at a second strand speed, wherein the first strand speed is at least 2 times the second strand speed to provide the netting;

or

Method II

providing an extrusion die comprising a plurality of shims positioned adjacent to one another, the shims together defining a first cavity and a second cavity, the extrusion die having a plurality of first dispensing orifices in fluid communication with the first cavity and having a plurality of second dispensing orifices connected to the second cavity, such that the first and second dispensing orifices are alternated; and

dispensing first polymeric strands from the first dispensing orifices at a first strand speed while simultaneously dispensing second polymeric strands from the second dispensing orifices at a second strand speed, wherein the first strand speed is at least 2 times the second strand speed to provide the netting.

14. The array of claim 1, wherein both the first and second strands have been stretched beyond a yield point of the respective strands.

5. An extrusion die comprising one of:

(I)

a plurality of shims positioned adjacent to one another, the shims together defining a cavity and a dispensing surface, wherein the dispensing surface has an array of first dispensing orifices alternating with an array of second dispensing orifices, wherein the plurality of shims comprises a plurality of a repeating sequence of shims comprising a shim that provides a fluid passageway between the cavity and the first dispensing orifices and a shim that provides a fluid passageway between the cavity and the second dispensing orifices where the first array of fluid passageways has greater fluid restriction than the second array of fluid passageways;

or

(II)

a plurality of shims positioned adjacent to one another, the shims together defining a first cavity, a second cavity, and a dispensing surface, wherein the dispensing surface has an array of first dispensing orifices alternating with an array of second dispensing orifices, wherein the plurality of shims comprises a plurality of a repeating sequence of shims comprising a shim that provides a fluid passageway between the first cavity and one of the first dispensing orifices and a shim that provides a fluid passageway between the second cavity and one of second the dispensing orifices.

6. An extrusion die comprising one of:

(I)

a plurality of shims positioned adjacent to one another, the shims together defining a cavity and a dispensing surface, wherein the dispensing surface has at least one net-forming zone and at least one film-forming zone, wherein the net-forming zone has an array of first dispensing orifices alternating with an array of second dispensing orifices;

or

(II)

a plurality of shims positioned adjacent to one another, the shims together defining a first cavity, a second cavity, and a dispensing surface, wherein the dispensing surface has at least one net-forming zone and at least one film-forming zone, wherein the net-forming zone has an array of first dispensing orifices alternating with an array of second dispensing orifices.

7. An attachment system comprising a netting and an array of engagement posts for engaging with the netting, the netting comprising an array of polymeric strands periodically joined together at bond regions throughout the array, wherein the netting has a thickness up to 750 micrometers.

8. The attachment system of claim 7, where there is a ribbon region adjacent and connected to one side of the netting.

9. An attachment system comprising an array of engagement posts engaged with a netting, the netting comprising an array of polymeric strands periodically joined together at bond regions throughout the array, wherein the netting has a thickness up to 750 micrometers.

10. The attachment system of claim 9, where there is a ribbon region adjacent and connected to one side of the netting.

11. An array of alternating first and second polymeric strands, wherein the first and second strands periodically join together at bond regions throughout the array, wherein at least one of the first or second strands have a property of having been stretched beyond a yield point of the respective strands, wherein the first strands have an average first yield strength, and wherein the second strands have an average second yield strength that is different than the first yield strength.

12. An article comprising two arrays of claim 11 with a ribbon region disposed there between.

13. An article comprising the array of claim 11 disposed between two ribbon regions.