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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0662543 (1991-02-28) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 372 인용 특허 : 0 |
An improved method and apparatus for incrementally stretching “zero strain”stretch laminate webs to impart elasticity thereto in the direction of stretching, at least up to the point of initial stretching. The “zero strain”stretch laminate material is formed of at least two plies of material which a
An improved method and apparatus for incrementally stretching “zero strain”stretch laminate webs to impart elasticity thereto in the direction of stretching, at least up to the point of initial stretching. The “zero strain”stretch laminate material is formed of at least two plies of material which are either intermittently or substantially continuously secured to one another along at least a portion of their coextensive surfaces while in a substantially untensioned (“zero strain”) condition. One of the plies is stretchable and elastomeric, while the second ply is elongatable, but not necessarily elastomeric. The second ply will, upon stretching of the laminate, be at least to a degree permanently elongated so that, upon release of the applied tensile forces, it will not return to its original undistorted configuration. This results in z-direction bulking of the laminate web when the applied tension is released as well as subsequent elastic extensibility in the direction of initial stretching, at least up to the point of initial stretching. In a particularly preferred embodiment of the present invention, the mechanical stretching operation is carried out by passing said laminate web between multiple pairs of meshing corrugated rolls, each pair of rolls exhibiting a greater degree of meshing than the preceding pair, to sequentially stretch said web in stages. Sequentially stretching the web in the foregoing manner minimizes damage to the web.
An improved method for sequentially stretching a zero strain stretch laminate web to impart elasticity thereto in the direction of stretching, at least up to the point of initial stretching, without rupturing said zero strain stretch laminate web, said method comprising the steps of: (a) feeding a z
An improved method for sequentially stretching a zero strain stretch laminate web to impart elasticity thereto in the direction of stretching, at least up to the point of initial stretching, without rupturing said zero strain stretch laminate web, said method comprising the steps of: (a) feeding a zero strain stretch laminate web comprising a substantially untensioned first elastomeric ply intermittently secured to a substantially untensioned second ply comprising a continuous web which is elongatable, but which exhibits less elastic recovery than said first ply, between a first pair of opposed pressure applicators having three-dimensional surfaces which, at least to a degree, are complementary to one another; (b) subjecting the portions of said zero strain stretch laminate web located between said first pair of opposed pressure applicators to incremental stretching by causing said three-dimensional surfaces of said first pair of opposed pressure applicators to mesh with one another, at least to a degree, whereby said second elongatable ply is permanently elongated, at least to a degree, by said initial incremental stretching; (c) removing at least one of said first pair of pressure applicators from contact with the surface of said initially stretched portion of said zero strain stretch laminate web, thereby relieving the stretching tension on said initially stretched portion of said laminate web; and (d) subjecting said initially stretched portions of said zero strain stretch laminate web to further incremental stretching by contacting the exposed surface of said partially stretched zero strain stretch laminate web with a second pair of opposed pressure applicators having three-dimensional surfaces which are also, at least to a degree, complementary to one another, but which mesh to a greater degree than said first pair of opposed pressure applicators, whereby said second elongatable ply is further permanently elongated with minimal damage by said sequential stretching operations so that said laminate web is elastically extensible in the direction of incremental stretching, at least up to the point of stretching by said second pair of opposed pressure applicators, and the width of said laminate web measured in said direction of stretching is substantially the same as before said initial stretching was applied once the incremental stretching forces are removed from said zero strain stretch laminate web.
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