Process for making a nonwoven web derived from lactic acid, web produced thereby, and apparatus therefor
AssigneeFiberweb Sodoca Sarl
InventorsPhilippe Ehret, Philippe Guipouy, Kimmo Lahtenkorva
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the manufacture of a nonwoven web using filaments of melted polymers, of the type including the steps of spinning the polymer or polymers, of cooling, drawing and laying down fibers on a belt and of bonding said fibers by calendering in order to form said nonwoven web (15), which process furthermore includes a treatment (13, 14) of setting/adjusting the degree of crystallinity of and the internal tension in the fibers making up the nonwoven web. The invention also relates to the nonwovens obtained by the process and to the installations for implementing it.
Claims11
A process for the manufacture of a nonwoven web using fibers of one or more melted polymers, consisting of lactic acid or a derivative thereof, and wherein the process comprises the steps of spinning the melted polymer to form the fibers, cooling, drawing and laying down the fibers on a belt, bonding said fibers by calendaring to form the web, and setting/adjusting the degree of crystallinity of and the internal tension in the fibers of the nonwoven web, the setting/adjusting consisting essentially of biaxial setting after the calendaring, then low temperature heating the web under biaxial tension, followed by cooling.
Dependencies are inferred from the claim text.