A process for manufacturing robust, flexible sheet-like material, includes the steps of a) applying a waxy composition to the web to form a waxed web; b) leading the waxed web via at least one roller to a chiller; c) cooling the waxed web; and d) leading the waxed web to a collection station for collecting the waxed web for further processing. The waxy composition comprises about 10-60 wt-% of a waxy compound and about 90-40 wt-% of a diluent. The waxy compound is selected from the group consisting of A) monoesters of a polyhydric aliphatic alcohol and a fatty acid; B) diesters of a polyhydric aliphatic alcohol and a fatty acid; and C) mixtures of said monoesters and diesters. The coating forms a stable liquid mixture at a temperature between about 35° C. and about 100° C., has a liquefaction temperature of at least about 30° C., and has a contact angle with a flat surface of the substrate of less than about 35° when measured at a temperature of 60° C.
1. A process for manufacturing a film, comprising the steps:
a) applying a coating liquid having a temperature of greater than 35 ° C. to about 100 ° C. comprising:
i) about 10-60 wt-% of a waxy compound selected from the group consisting of:
A) monoesters of a polyhydric aliphatic alcohol and a fatty acid containing from eight to eighteen carbon atoms and wherein said monoester has at least one hydroxyl group associated with its aliphatic alcohol residue;
B) diesters of a polyhydric aliphatic alcohol and a fatty acid containing from eight to eighteen carbon atoms and wherein said diester has at least one hydroxyl group associated with its aliphatic alcohol residue; and
C) mixtures of said monoesters and diesters; and
ii) about 90-40 wt-% of a diluent;
to a polymeric film, wherein the coating liquid forms a stable liquid mixture at a temperature between about 35 ° C. and about 100 ° C., has a liquefaction temperature of at least about 30 ° C., and has a contact angle with a flat surface of the polymeric film of less than about 35° when measured at a temperature of 60 ° C.;
b) leading the coated polymeric film via at least one roller to a chiller comprising an enclosure and having a cooling source having a temperature of less than about −120 ° C.;
c) cooling the coated polymeric film to form a, flexible, waxed film; and
d) leading the waxed film to a collection station for collecting the waxed film for further processing.
2. The process of claim 1 , wherein the step of applying the coating liquid to the polymeric film comprises contacting the polymeric film with the coating liquid having a temperature of between about 45 ° C. and about 75 ° C.
3. The process of claim 1 , wherein the cooling source has a temperature of less than about −150 ° C.
4. The process of claim 1 , wherein the coated polymeric film is cooled to a temperature of less than about −20 ° C.
5. The process of claim 1 , wherein the polymeric film is an apertured film.