Thermoplastic films with visually-distinct stretched regions and methods for making the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-055/18
B65D-030/00
B65D-033/01
B29C-055/06
B29C-055/08
출원번호
US-0454412
(2012-04-24)
등록번호
US-9381697
(2016-07-05)
발명자
/ 주소
Dorsey, Robert T.
Borchardt, Michael G.
출원인 / 주소
The Glad Products Company
대리인 / 주소
Feix, Thomas C.
인용정보
피인용 횟수 :
0인용 특허 :
88
초록▼
Thermoplastic films include intermittent stretched regions that are visually distinct from un-stretched regions. The stretched regions can be white, opaque, and non porous. The thermoplastic films with visually-distinct stretched regions can be formed into bags for use as trash can liners or food st
Thermoplastic films include intermittent stretched regions that are visually distinct from un-stretched regions. The stretched regions can be white, opaque, and non porous. The thermoplastic films with visually-distinct stretched regions can be formed into bags for use as trash can liners or food storage. Additionally, methods of stretching thermoplastic films to create non-porous, white, and opaque stretched regions include incrementally stretching a film of a thermoplastic material and a voiding agent.
대표청구항▼
1. A thermoplastic bag, comprising: first and second sidewalls of a thermoplastic film that comprises linear low-density polyethylene and a voiding agent, the voiding agent being between 5 and 25 percent by weight of the first and second sidewalls, the first and second sidewalls being joined along t
1. A thermoplastic bag, comprising: first and second sidewalls of a thermoplastic film that comprises linear low-density polyethylene and a voiding agent, the voiding agent being between 5 and 25 percent by weight of the first and second sidewalls, the first and second sidewalls being joined along three edges;a plurality of un-stretched regions formed in one or more of the first sidewall or the second sidewall, the un-stretched regions having a first average thickness; anda plurality of cold-stretched regions intermittently dispersed about the un-stretched regions, the cold-stretched regions having a second average thickness that is smaller than the first average thickness;wherein the cold-stretched regions are non-porous and more opaque than the un-stretched regions. 2. The thermoplastic bag as recited in claim 1, wherein the thermoplastic film comprises between about 65 and about 99 percent by weight of a thermoplastic material, and between 5 and 20 percent by weight of the voiding agent. 3. The thermoplastic bag as recited in claim 1, wherein a color of the cold-stretched regions differs from a color of the un-stretched regions. 4. The thermoplastic bag as recited in claim 2, wherein the voiding agent comprises calcium carbonate. 5. The thermoplastic bag as recited in claim 1, wherein the un-stretched regions are non-porous. 6. The thermoplastic bag as recited in claim 1, wherein the cold-stretched regions comprise one or more of: stripes extending along the thermoplastic film in a direction transverse to a direction in which the thermoplastic film was extruded;stripes extending along the thermoplastic film in a direction in which the thermoplastic film was extruded; ordiscontinuous strainable networks extending in a direction transverse to direction in which the thermoplastic film was extruded. 7. The thermoplastic bag as recited in claim 6, wherein the cold-stretched regions comprise: stripes extending along the thermoplastic film in a direction in which the thermoplastic film was extruded; andstripes extending along the thermoplastic film in a direction transverse to a direction in which the thermoplastic film was extruded. 8. The thermoplastic bag as recited in claim 6, wherein the cold-stretched regions comprise discontinuous strainable networks arranged in diamond patterns. 9. The thermoplastic bag as recited in claim 1, further comprising: a first section, the first plurality of cold-stretched regions being located entirely in the first section; anda second un-stretched section. 10. A thermoplastic bag, comprising: first and second sidewalls of a thermoplastic film that comprises a voiding agent, the voiding agent being between 5 and 20 percent by weight of the first and second sidewalls, the first and second sidewalls being joined along three edges;a plurality of thick regions formed in one or more of the first sidewall or the second sidewall, the thick regions having a first average thickness; anda plurality of cold-stretched regions alternating with the thick regions, the cold-stretched regions having a second average thickness that is smaller than the first average thickness;wherein the cold-stretched regions are non-porous and more opaque than the thick regions. 11. The thermoplastic bag as recited in claim 10, wherein the thermoplastic film comprises between about 65 and about 99 percent by weight of a thermoplastic material, and between about 10 and about 15 percent by weight of the voiding agent. 12. The thermoplastic bag as recited in claim 11, wherein the thermoplastic material comprises linear low density polyethylene. 13. The thermoplastic bag as recited in claim 11, wherein the voiding agent comprises calcium carbonate. 14. The thermoplastic bag as recited in claim 11, wherein the voiding agent comprises between 15 percent by weight of the thermoplastic film. 15. The thermoplastic bag as recited in claim 10, wherein a color of the cold-stretched regions differs from a color of the thick regions. 16. The thermoplastic bag as recited in claim 10, wherein an average thickness of the cold-stretched regions is less than an average thickness of the thick regions. 17. The thermoplastic bag as recited in claim 10, wherein the cold-stretched regions comprise one or more of: stripes extending along the thermoplastic film in a direction transverse to a direction in which the thermoplastic film was extruded;stripes extending along the thermoplastic film in a direction in which the thermoplastic film was extruded; ordiscontinuous strainable networks extending in a direction transverse to direction in which the thermoplastic film was extruded. 18. The thermoplastic bag as recited in claim 17, wherein the cold-stretched regions comprise: stripes extending along the thermoplastic film in a direction in which the thermoplastic film was extruded; andstripes extending along the thermoplastic film in a direction transverse to a direction in which the thermoplastic film was extruded. 19. The thermoplastic bag as recited in claim 10, wherein the cold-stretched regions comprise discontinuous strainable networks arranged in diamond patterns. 20. The thermoplastic bag as recited in claim 19, further comprising: a first section, the first plurality of stretched regions being located entirely in the first section; anda second thick section.
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