B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/18 (2006.01) A61F 13/15 (2006.01) B29C 53/28 (2006.01) B29C 55/02 (2006.01) B29C 55/06 (2006.01) B29C 55/08 (2006.01)
Patent
CA 2104236
An improved method and apparatus for incrementally stretching "zero strain" stretch lami- nate webs to impart elasticity thereto in the direc- tion of stretching, at least up to the point of initial stretching. The "zero strain" stretch laminate mate- rial (1) is formed of at least two plies (4a, 5, 6) of material which are either intermittently or substan- tially continuously secured to one another along at least a portion of their coextensive surfaces while in a substantially untensioned ("zero strain") condi- tion. One of the plies (4a) is stretchable and elas- tomeric, while the second ply (5, 6) 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 stretch- ing. In a particularly preferred embodiment of the present invention, the mechanical stretching opera- tion is carried out by passing said laminate web between multiple pairs of meshing corrugated rolls (21, 25, 27), 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.
Richardson James Williamson
Weber Gerald Martin
Sim & Mcburney
The Procter & Gamble Company
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