Multi-layered bags with discrete non-continuous lamination
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| Názov: | Multi-layered bags with discrete non-continuous lamination |
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| Patent Number: | 8,940,377 |
| Dátum vydania: | January 27, 2015 |
| Appl. No: | 13/299512 |
| Application Filed: | November 18, 2011 |
| Abstrakt: | Multi-layer bags may be formed to include first and second sidewalls joined along a first side edge, an opposite second side edge, and a closed bottom edge. The first and second layers may be non-continuously laminated together in discrete sections to include bonded regions in which the layers are bonded and unbonded regions in which the layers are not bonded. Such a bag may be described as a “bag-in-a-bag” type configuration in which the inner bag is non-continuously bonded to the outer bag. The inventors have surprisingly found that such configurations of non-continuous bonding provides increased and unexpected strength properties to the multi-layer films and bags. |
| Inventors: | Fraser, Robert W. (Lombard, IL, US); Borchardt, Michael G. (Naperville, IL, US); MacPherson, Jack A. (Aurora, IL, US); Dorsey, Robert T. (Orland, IL, US); Binger, Scott (Bridgeview, IL, US); Broering, Shaun T. (Fort Thomas, KY, US) |
| Assignees: | The Glad Products Company (Oakland, CA, US) |
| Claim: | 1. A thermoplastic bag having improved strength comprising: a first thermoplastic bag having first and second opposing sidewalls joined together along a bottom edge and opposing side edges, the first thermoplastic bag including a bottom section extending from the bottom edge toward an opposing opening, a middle section extending from the bottom section toward the opening, and an upper section extending from the middle section toward the opening; a second thermoplastic bag positioned within the first thermoplastic bag, the second thermoplastic bag having third and fourth opposing sidewalls joined together along a bottom edge and opposing side edges, the second thermoplastic bag including a bottom section extending from the bottom edge toward an opposing opening, a middle section extending from the bottom section toward the opening, and an upper section extending from the middle section toward the opening; and a first plurality of non-continuous bonds securing the middle section of the first thermoplastic bag to the middle section of the second thermoplastic bag, the first plurality of non-continuous bonds comprise one of ultrasonic bonds, adhesive bonds, bonds formed from MD ring rolling, bonds formed from TD ring rolling, or bonds formed from SELFing; a second plurality of non-continuous bonds securing at least one of the respective upper and bottom sections of the first thermoplastic bag and the second thermoplastic bag together, wherein the second plurality of non-continuous bonds differs in bond type from the first plurality of non-continuous-bonds, the second plurality of non-continuous bonds comprise one of ultrasonic bonds, adhesive bonds, bonds formed from MD ring rolling, bonds formed from TD ring rolling, or bonds formed from SELFing; wherein at least one of the bottom section and the upper section of the first thermoplastic bag are devoid of non-continuous bonds securing the first thermoplastic bag and the second thermoplastic bag together; and wherein at least one of the bottom section and the upper section of the second thermoplastic bag are devoid of non-continuous bonds securing the first thermoplastic bag and the second thermoplastic bag together. |
| Claim: | 2. The thermoplastic bag as recited in claim 1 , wherein the second plurality of non-continuous bonds securing the respective upper sections of the first thermoplastic bag and the second thermoplastic bag together comprise a plurality of bonds formed from SELFing. |
| Claim: | 3. The thermoplastic bag as recited in claim 2 , wherein the first plurality of non-continuous bonds securing the respective middle sections of the first thermoplastic bag and the second thermoplastic bag together comprise a plurality of bonds formed from TD ring rolling. |
| Claim: | 4. The thermoplastic bag as recited in claim 1 , further comprising a first continuous side seam and a second continuous side seam securing the respective bottom sections, middle sections, and upper sections of the first thermoplastic bag and the second thermoplastic bag together. |
| Claim: | 5. The thermoplastic bag as recited in claim 1 , further comprising a continuous hem seal extending between the opposing sidewalls and third plurality of non-continuous bonded regions securing another of the respective bottom sections, middle sections, or upper sections of the first thermoplastic bag and the second thermoplastic bag together, the upper sections of the thermoplastic bag and the second thermoplastic bag being positioned between the continuous hem seal and the middle sections. |
| Claim: | 6. The thermoplastic bag as recited in claim 3 , further comprising a third plurality of non-continuous bonds formed by TD ring rolling securing the respective upper sections of the first thermoplastic bag and the second thermoplastic bag together. |
| Claim: | 7. The thermoplastic bag as recited in claim 1 , wherein one or more of the first thermoplastic bag or the second thermoplastic bag is incrementally stretched. |
| Claim: | 8. The thermoplastic bag as recited in claim 7 , wherein one or more of the first thermoplastic bag or the second thermoplastic bag is MD ring rolled. |
| Claim: | 9. A multi-layered bag, comprising: a first sidewall comprising a first layer of a thermoplastic material and an adjacent second layer of thermoplastic material; a second sidewall comprising a first layer of a thermoplastic material and an adjacent second layer of thermoplastic material, wherein: the second sidewall is joined to the first sidewall along a first side edge, an opposing second side edge, and a bottom edge, and at least a portion of respective top edges of the first and second sidewalls define an opening of the multi-layered bag; a bottom section extending from the bottom edge toward the opening, a middle section extending from the bottom section toward the opening, and an upper section extending from the middle section toward the opening; a first plurality of non-continuous bonds of a first type securing the middle section of the first and second layers of the first sidewall together; and a second plurality of non-continuous bonds of a second type securing one of the bottom and upper sections of the first and second layers of the first sidewall together, the second type of non-continuous bonds differing from the first type of non-continuous bonds; non-continuous bonds of the first type securing the bottom section of the first and second layers of the first sidewall together and securing the upper section of the first and second layers of the sidewall together; wherein the first plurality of non-continuous bonds are partially discontinuous and the second plurality of non-continuous bonds are discontinuous; the first plurality of non-continuous bonds comprise one of ultrasonic bonds, adhesive bonds, bonds formed from MD ring rolling, bonds formed from TD ring rolling; and the second plurality of non-continuous bonds comprise one of ultrasonic bonds, adhesive bonds, or bonds formed from SELFing. |
| Claim: | 10. The multi-layered bag as recited in claim 9 , wherein one or more of the first and second layers of the first sidewall and the second sidewall are incrementally stretched. |
| Claim: | 11. The multi-layered bag as recited in claim 9 , wherein the non-continuous bonds of the first type comprise bonds formed by MD ring rolling. |
| Claim: | 12. The multi-layered bag as recited in claim 11 , wherein the non-continuous bonds of the second type: comprise bonds formed by SELFing; and secure the upper section of the first and second layers of the first sidewall together. |
| Claim: | 13. The multi-layered bag as recited in claim 12 , further comprising a third plurality of non-continuous bonds of a third type securing the middle section of the first and second layers of the first sidewall together, the third type of non-continuous bonds differing from the first type of non-continuous bonds and the second type of non-continuous bonds. |
| Claim: | 14. The multi-layered bag as recited in claim 13 , wherein the non-continuous bonds of the third type comprise bonds formed by TD ring rolling. |
| Claim: | 15. The multi-layered bag as recited in claim 9 , further comprising a drawstring. |
| Current U.S. Class: | 428/357 |
| Patent References Cited: | 2714571 August 1955 Irion et al. 3058868 October 1962 Schroeder 3622422 November 1971 Newman et al. 3857144 December 1974 Bustin 4116892 September 1978 Schwarz 4153664 May 1979 Sabee 4153751 May 1979 Schwarz 4289832 September 1981 Schwarz 4302495 November 1981 Marra 4343848 August 1982 Leonard, Jr. 4379197 April 1983 Cipriani 4438167 March 1984 Schwarz 4517714 May 1985 Sneed et al. 4522203 June 1985 Mays 4614679 September 1986 Farrington, Jr. et al. 4692368 September 1987 Taylor et al. 4704238 November 1987 Okuyama et al. 4753840 June 1988 Van Gompel 4930905 June 1990 Sharps, Jr. 5035941 July 1991 Blackburn 5100721 March 1992 Akao 5263587 November 1993 Elkin et al. 5272856 December 1993 Pharo 5296184 March 1994 Wu et al. 5382461 January 1995 Wu 5422172 June 1995 Wu 5518801 May 1996 Chappell et al. 5804265 September 1998 Saad et al. 5851937 December 1998 Wu et al. 5861074 January 1999 Wu 5865926 February 1999 Wu et al. 6013151 January 2000 Wu et al. 6214147 April 2001 Mortellite et al. 6254736 July 2001 Earl et al. 6265045 July 2001 Mushaben 6361784 March 2002 Brennan et al. 6385818 May 2002 Savicki, Sr. 7306729 December 2007 Bacino et al. 2002/0074691 June 2002 Mortellite et al. 2004/0170810 September 2004 Rasmussen 2005/0244085 November 2005 Savicki et al. 2006/0093766 May 2006 Savicki et al. 2007/0166503 July 2007 Hannigan 2007/0254120 November 2007 Rasmussen 2008/0124461 May 2008 Leener et al. 2009/0029114 January 2009 Cancio et al. 2011/0117307 May 2011 Fraser et al. WO9013702 November 1990 WO9956953 November 1999 |
| Other References: | International Search Report, mailed Jan. 24, 2013, from counterpart PCT/US 12/65637, filing date Nov. 16, 2012. cited by applicant |
| Assistant Examiner: | Sanderson, Lee |
| Primary Examiner: | Kashnikow, Erik |
| Attorney, Agent or Firm: | Feix, Thomas C. |
| Prístupové číslo: | edspgr.08940377 |
| Databáza: | USPTO Patent Grants |
| Abstrakt: | Multi-layer bags may be formed to include first and second sidewalls joined along a first side edge, an opposite second side edge, and a closed bottom edge. The first and second layers may be non-continuously laminated together in discrete sections to include bonded regions in which the layers are bonded and unbonded regions in which the layers are not bonded. Such a bag may be described as a “bag-in-a-bag” type configuration in which the inner bag is non-continuously bonded to the outer bag. The inventors have surprisingly found that such configurations of non-continuous bonding provides increased and unexpected strength properties to the multi-layer films and bags. |
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