Reticulated thermoplastic film and method of making the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-003/10
B32B-007/12
B29D-028/00
C08J-005/18
B29C-055/14
B32B-003/26
A61F-013/62
출원번호
US-0901015
(2013-05-23)
등록번호
US-9944764
(2018-04-17)
발명자
/ 주소
Chandrasekaran, Neelakandan
Hanschen, Thomas P.
Pariseau, Timothy P.
Unruh, William C.
출원인 / 주소
3M Innovative Properties Company
인용정보
피인용 횟수 :
0인용 특허 :
71
초록▼
A reticulated thermoplastic film includes a backing with openings and discrete elements protruding from the first major surface. There are two discrete elements aligned in a first direction abutting opposite ends of any given opening. In a second direction perpendicular to the first direction, there
A reticulated thermoplastic film includes a backing with openings and discrete elements protruding from the first major surface. There are two discrete elements aligned in a first direction abutting opposite ends of any given opening. In a second direction perpendicular to the first direction, there is one discrete element between the given opening and an adjacent opening aligned in the second direction. Each portion of the backing around the given opening is plastically deformed in its lengthwise direction and typically has higher stretch-induced molecular orientation at its edge adjacent the given opening than at its midpoint. The openings are often retractable. A method of making a reticulated thermoplastic film is also disclosed. The method includes stretching a thermoplastic backing with a plurality of discrete elements in the first direction. Subsequently stretching the backing in the second direction forms a tear in the backing between two adjacent discrete elements.
대표청구항▼
1. A reticulated thermoplastic film comprising: a thermoplastic backing comprising first and second major surfaces, a plurality of retractable openings in the thermoplastic backing, and a plurality of discrete elements protruding from the first major surface of the thermoplastic backing, wherein the
1. A reticulated thermoplastic film comprising: a thermoplastic backing comprising first and second major surfaces, a plurality of retractable openings in the thermoplastic backing, and a plurality of discrete elements protruding from the first major surface of the thermoplastic backing, wherein there are two discrete elements at opposite ends of any given retractable opening that each form a portion of the border of the given retractable opening, wherein the two discrete elements are aligned in a first direction, wherein there is one discrete element between the given retractable opening and an adjacent retractable opening aligned in a second direction perpendicular to the first direction with a portion of the thermoplastic backing between the one discrete element and the given opening so that the one discrete element does not form a portion of the border of the given opening, wherein there is no other discrete element between the given retractable opening and the adjacent retractable opening, wherein at least some of the discrete elements are male fastening elements, and wherein each portion of the thermoplastic backing around the given retractable opening is plastically deformed in its lengthwise direction. 2. A reticulated thermoplastic film comprising: a thermoplastic backing comprising first and second major surfaces, a plurality of openings in the thermoplastic backing, and a plurality of discrete elements protruding from the first major surface of the thermoplastic backing, wherein there are two discrete elements at opposite ends of any given opening that each form a portion of the border of the given opening, wherein the two discrete elements are aligned in a first direction, wherein there is one discrete element between the given opening and an adjacent opening aligned in a second direction perpendicular to the first direction with a portion of the thermoplastic backing between the one discrete element and the given opening so that the one discrete element does not form a portion of the border of the given opening, wherein there is no other discrete element between the given opening and the adjacent opening, wherein at least some of the discrete elements are male fastening elements, and wherein at least one portion of the thermoplastic backing around the given opening has a profile across its width of higher stretch-induced molecular orientation at its edge adjacent the given opening than at its midpoint. 3. The reticulated thermoplastic film of claim 2, wherein at least some of the discrete elements each comprise one upstanding post. 4. The reticulated thermoplastic film of claim 3, wherein the male fastening element comprises an upstanding post protruding from the first major surface of the thermoplastic backing and a cap distal from the thermoplastic backing. 5. The reticulated thermoplastic film of claim 2, wherein at least some of the discrete elements comprise more than one upstanding post on a surface protrusion. 6. The reticulated thermoplastic film claim 2, wherein the thermoplastic backing is substantially planar. 7. The reticulated thermoplastic film of claim 2, wherein the plurality of discrete elements are arranged in a staggered array when viewed in the first direction. 8. The reticulated thermoplastic film of claim 2, wherein the thermoplastic backing comprises at least one of polyethylene or polypropylene. 9. The reticulated thermoplastic film of claim 2, wherein the discrete elements have a height above the thermoplastic backing of at least 30 micrometers. 10. A laminate comprising the reticulated thermoplastic film of claim 2 joined to a carrier. 11. The laminate of claim 10, wherein the reticulated thermoplastic film is joined to the carrier with adhesive. 12. The laminate of claim 11, wherein the adhesive is exposed in at least some of the openings in the thermoplastic backing. 13. The laminate of claim 10, wherein the carrier is extensible. 14. A method of making the reticulated thermoplastic film of claim 2, the method comprising: providing a thermoplastic backing comprising first and second major surfaces and a plurality of discrete elements protruding from the first major surface of the thermoplastic backing, wherein at least some of the discrete elements are aligned in a row in a first direction;stretching the thermoplastic backing in the first direction to plastically deform the thermoplastic backing and separate the at least some of the discrete elements aligned in the row in the first direction, wherein the thermoplastic backing remains intact between the plurality of discrete elements after stretching it in the first direction; andsubsequently stretching the thermoplastic backing in a second direction perpendicular to the first direction, wherein stretching in the second direction forms a tear in the thermoplastic backing between two adjacent of the discrete elements aligned in the row in the first direction, wherein the tear is interrupted by the two adjacent of the discrete elements, wherein the tear provides an opening of the plurality of openings, and wherein at least one portion of the thermoplastic backing around the opening has the profile across its width of higher stretch-induced molecular orientation at its edge adjacent the opening than at its midpoint. 15. The method of claim 14, wherein after stretching in the second direction, the thermoplastic backing has a thickness that is substantially the same as before stretching in the second direction. 16. The method of claim 14, further comprising heating the thermoplastic backing at least one of during or after stretching it in the second direction. 17. The method of claim 14, wherein at least some of the discrete elements each comprise one upstanding post, or wherein at least some of the discrete elements comprise more than one upstanding post on a surface protrusion. 18. The method of claim 14, wherein the thermoplastic backing is substantially planar. 19. The method of claim 14, further comprising coating the second surface of the thermoplastic backing with adhesive before stretching the thermoplastic backing in the second direction. 20. The method of claim 14, further comprising laminating the reticulated thermoplastic film to a carrier.
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