05143679 is referenced by 339 patents and cites 82 patents.

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.

Title
Method for sequentially stretching zero strain stretch laminate web to impart elasticity thereto without rupturing the web
Application Number
7/662543
Publication Number
5143679
Application Date
February 28, 1991
Publication Date
September 1, 1992
Inventor
James W Richardson
Cincinnati
OH, US
Gerald M Weber
Loveland
OH, US
Agent
Richard C Witte
Thomas H O Flaherty
E Kelly Linman
Assignee
The Procter & Gamble Company
OH, US
IPC
B29C 55/04
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