B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/06 (2006.01)
Patent
CA 2285311
Breathable barriers, comprising a thermoplastic polymer and at least 30 % by weight filler, are stretched in one direction in multiple discrete steps wherein the strain rate of each discrete stretching step is less than about 100 000 %/minute and wherein the line speed of the last stretching step is in excess of 500 feet per minute. The resulting films may be stretched, as a result of the cumulative discrete stretching operations, from about 2 to 7 times its original length in order to create a breathable barrier having a WVTR in excess of 800 g/m2/day and a hydrohead of at least 60 cm.
L'invention porte sur des barrières respirante faites d'un polymère thermoplastique, et d'une charge représentant au moins 30 % du poids, étirées dans un sens par pas successifs, le taux d'application des contraintes par pas étant de moins de 100.000 % à la minute, et la vitesse de défilement en fin d'étirage étant de plus de 500 pieds à la minute. Le film résultant, obtenu par l'accumulation des pas successifs et pouvant atteindre de 2 à 7 fois sa longueur d'origine, constitue une barrière respirante présentant un taux de transmission de la vapeur d'eau de plus de 800 g/m<2>/jour et une colonne d'eau d'au moins 60 cm.
Jacobs Rob Lee
Jones Billy Ray Jr.
Wilson Tracy Neal
Borden Ladner Gervais Llp
Kimberly-Clark Worldwide Inc.
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