B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/18 (2006.01) A61F 13/15 (2006.01) B29C 55/02 (2006.01) B29C 55/08 (2006.01)
Patent
CA 2103822
An improved method and apparatus for incrementally stretching "zero strain" stretch laminate webs to impart elasticity thereto in the direction of initial stretching, at least up to the point of initial stretching. The "zero strain" stretch laminate material (1) is formed of at least two plies of material (4a, 5, 6) which are either intermittenly 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 (4a) is stretchable and elastomeric, while the second ply (5, 6) is elongatable, but not necessarily elastomeric. The sec- ond 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 opposed peripheral edge por- tions of the laminate web to be incrementally stretched are subjected to restraint to restraint to substantially prevent inwardly directed slip- page or contraction thereof in a direction parallel to the direction of stretching. This maximizes the effectiveness of the incremen- tal web stretching operation by forcing the "zero strain" stretch laminate web to undergo the fullest possible degree of elongation during the incremental stretching operation.
Benson Douglas Herrin
Richardson James William
Sabatelli David Albert
Vinnage William Robert Jr.
Weber Gerald Martin
Sim & Mcburney
The Procter & Gamble Company
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