Patent ID: 6649105
Filing Date: 2003-11-18
Classification: B29C,B29K

Abstract:
A method of manufacturing flexible transparent polyvinyl chloride film without facial flow marks and pits, which steps comprises:a. a transparent softened polyvinyl chloride film without facial flow marks to be formed by primarily use of the melted PVC material after completely calendered by a calender as a flat film then being immediately guided to pass a water bath tank for immediately cooled so as to make it to be formed as a completely transparent PVC film with partially crystallized state and without facial flow marks; b. by way of a water removing equipment to remove the water adhered to the surface of the completely transparent PVC film when after coming out of a water bath tank to improve the production efficiency and quality; c. subsequently the completely transparent PVC film is sent to pass a series of heated and cooled rollers to once again cool and heat it and to have it to be obtained a fully formation and kept in a controlled temperature at between 30Â° C. and 85Â° C. before winding; and d. after coming out of the heated and cooled rollers the completely transparent PVC film is sent to a winding machine and under keeping in controlled temperature at between 30Â° C. and 85Â° C. and under a pressure ranging from 1 kg/cm2 to 8 kg/cm2 is wound into a roll at a linear speed of 60 +/âˆ’10 meters/minute so as to prevent air from being entered and have it to be provided with smooth surface without air pits.