Patent ID: 7862676
Filing Date: 2011-01-04
Classification: B26D,B26F,B29C,B29K,Y10T

Abstract:
1. A method for stretching polymer films in width directions thereof comprising the steps of: connecting a rear end of leading said polymer film and a front end of following said polymer film using a connection tape composed of a first tape and a second tape, said first tape connecting side edges of said polymer films, said second tape connecting main parts of said polymer films, said main part being a center part in the width direction of said polymer film between said side edges, said main part becoming an end product; supplying the connected polymer films continuously; stretching the supplied polymer films by holding both side edges thereof with clips, said polymer films being conveyed by said clips during said stretching step; welding said leading polymer film and said following polymer film along a welding line after said stretching step, said welding line surrounding said first tape; cutting out a part with said first tape from the welded polymer films along a cutout line, said cutout line being inside said welding line and surrounding said first tape; slitting said side edges from said main parts of said polymer films; recovering the slit side edges; and wherein said first tape is a single-sided adhesive tape and said second tape is a double-sided adhesive tape.