Patent ID: 6383325
Filing Date: 2002-05-07
Classification: B32B,D06N

Abstract:
A method for manufacturing a polyurethane (P.U.) product with high wetting ability, gas permeability and high water repellent ability by means of a dry transfer coating process, said method comprising the steps of:(a) a front stage working including the steps of: providing a releasing sheet (1) which has a plurality of pattern cavities (12) defined therein; providing a first P.U. liquid (221) which is scraping resistant and strong solvent resistant; coating said first P.U. liquid (221) on said releasing sheet (1) to fill said pattern cavities (12) of said releasing sheet (1) with said first P.U. liquid (221); baking and drying said first P.U. liquid (221) to form a first P.U. surface layer (22) on said releasing sheet (1); providing a second weak solvent P.U. liquid (241); coating said second weak solvent P.U. liquid (241) on said first P.U. surface layer (22); baking and drying said second weak solvent P.U. liquid (241) to form a second P.U. surface layer (24) on said first P.U. surface layer (22); providing a bonding agent (30) on said second P.U. surface layer (24); providing a substrate cloth (10) on said bonding agent (30); and baking and drying said bonding agent (30) so that said substrate cloth (10) is securely bonded on said second P.U. surface layer (24) through said bonding agent (30), thereby forming a first product (50) which includes said first P.U. surface layer (22), said second P.U. surface layer (24), said bonding agent (30), and said substrate cloth (10); (b) a rear stage working including the steps of: providing a first mixing liquid (44) to be rolled and printed on said first product (50) for performing a surface treatment of a first printing plate so as to form a plurality of intensive small air vents (90) in said second P.U. surface layer (24) for increasing permeability of said second P.U. surface layer (24); providing a second mixing liquid (54) containing a fluoride to be rolled and printed on said first product (50) for performing a surface treatment of a second printing plate so that said fluoride infiltrates through said first P.U. surface layer (22) and said second P.U. surface layer (24) for increasing a water repellent function of said first P.U. surface layer (22); and providing a third mixing liquid (64) containing a P.U. solvent to be rolled and printed on said first product (50) for performing a surface treatment of a third printing plate so as to increase comfort and quality of said first product (50), thereby making a final product (52).