Multilayer draw tape
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| Název: | Multilayer draw tape |
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| Patent Number: | 8,657,495 |
| Datum vydání: | February 25, 2014 |
| Appl. No: | 12/854415 |
| Application Filed: | August 11, 2010 |
| Abstrakt: | The bag includes a draw tape that may be used to cinch closed the opening of the bag. The draw tape is multilayer with a polypropylene core and propylene-ethylene copolymer or other suitable polymers in the outer layers. |
| Inventors: | Maxwell, Jason R. (Elgin, IL, US); Borchardt, Michael G. (Naperville, IL, US) |
| Assignees: | The Glad Products Company (Oakland, CA, US) |
| Claim: | 1. A draw tape bag comprising: a first sidewall; a second sidewall, the second sidewall joined to the first sidewall by a closed bottom end, a first edge, and a second edge, thereby defining an open top end having a top surface with a top length; at least one of the sidewalls forming a hem having a top length and extending along the open top end disposed opposite the bottom end having a bottom length, the hem including one or more draw tape notches; a pliable thermoplastic draw tape housed within the hem and attached to the bag by side seals at the first and second edges of the bag; wherein the draw tape comprises a multilayer structure with a polypropylene core and outer layers of a copolymer consisting essentially of propylene and ethylene, and wherein the outer layer comprises a mixture of the copolymer and polyethylene. |
| Claim: | 2. The draw tape bag of claim 1 , wherein the propylene-ethylene copolymer contains 8% to 30% ethylene. |
| Claim: | 3. The draw tape bag of claim 1 , wherein the draw tape has a thickness of from 1 to 4 mils. |
| Claim: | 4. The draw tape bag of claim 1 , wherein the draw tape has a thickness of from 2 to 3 mils. |
| Claim: | 5. The draw tape bag of claim 1 , wherein the ratio thickness of the outer layer to the inner layer is 1 to 20 to 2 to 1. |
| Claim: | 6. The draw tape bag of claim 1 , wherein the ratio thickness of the outer layer to the inner layer is 1 to 10 to 1 to 1. |
| Claim: | 7. The draw tape bag of claim 1 , wherein the draw tape is produced by a slot cast extrusion process. |
| Claim: | 8. The draw tape bag of claim 1 , wherein the draw tape is produced by a blown film extrusion process. |
| Claim: | 9. A draw tape bag comprising: a first sidewall; a second sidewall, the second sidewall joined to the first sidewall by a closed bottom end, a first edge, and a second edge, thereby defining an open top end having a top surface with a top length; both of the sidewalls forming a hem having a top length and extending along the open top end disposed opposite the bottom end having a bottom length, the hem including one or more draw tape notches; a pliable thermoplastic draw tape housed within the hem and attached to the bag by side seals at the first and second edges of the bag; wherein the draw tape comprises a multilayer structure with a polypropylene core comprising greater than 80% polypropylene and outer layers comprising a copolymer consisting essentially of propylene and ethylene and having 8% to 30% ethylene, and wherein the outer layer comprises a mixture of the copolymer and polyethylene. |
| Claim: | 10. The draw tape bag of claim 9 , wherein the draw tape has a thickness of from 1 to 4 mils. |
| Claim: | 11. The draw tape bag of claim 9 , wherein the draw tape has a thickness of from 2 to 3 mils. |
| Claim: | 12. The draw tape bag of claim 9 , wherein the ratio thickness of the outer layer to the inner layer is 1 to 20 to 2 to 1. |
| Claim: | 13. The draw tape bag of claim 9 , wherein the ratio thickness of the outer layer to the inner layer is 1 to 10 to 1 to 1. |
| Claim: | 14. The draw tape bag of claim 9 , wherein the draw tape is produced by a slot cast extrusion process. |
| Claim: | 15. The draw tape bag of claim 9 , wherein the draw tape is produced by a blown film extrusion process. |
| Claim: | 16. The draw tape bag of claim 9 , wherein the draw tape polypropylene core comprises greater than 90% polypropylene. |
| Claim: | 17. The draw tape bag of claim 9 , wherein the draw tape polypropylene core comprises greater than 98% polypropylene. |
| Current U.S. Class: | 383/75 |
| Patent References Cited: | 2798523 July 1957 Barrett 3029853 April 1962 Piazze 3506048 April 1970 Annikki 3687357 August 1972 Hansen 4310578 January 1982 Katsura et al. 4813794 March 1989 Herrington 5006380 April 1991 Fraser 6602174 August 2003 Haverfield et al. 6678923 January 2004 Goldberg et al. 7914207 March 2011 Beam 2005/0019596 January 2005 Marechal 2005/0031233 February 2005 Varanese et al. 2005/0063622 March 2005 Kannabiran 2006/0229581 October 2006 Ulas et al. 2010/0172602 July 2010 O'Donnell et al. 2010/0272379 October 2010 Hu et al. 2010/0303388 December 2010 Kent et al. 2011/0164834 July 2011 Stiglic et al. |
| Assistant Examiner: | Battisti, Derek |
| Primary Examiner: | Pascua, Jes F |
| Attorney, Agent or Firm: | Feix, Thomas C. |
| Přístupové číslo: | edspgr.08657495 |
| Databáze: | USPTO Patent Grants |
| Abstrakt: | The bag includes a draw tape that may be used to cinch closed the opening of the bag. The draw tape is multilayer with a polypropylene core and propylene-ethylene copolymer or other suitable polymers in the outer layers. |
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