Patent ID: 6797100
Filing Date: 2004-09-28
Classification: B29C,Y10T

Abstract:
A method for the production of a film tube on a cellulose basis, which is strengthened by an insert, involving:extruding an aqueous cellulose-N-methyl-morpholine N-oxide (NMMO) solution onto the insert, comprising drawing said insert from a roll and forming said insert into a tube with an overlapping longitudinal seam, preheating the tube is with hot air to a temperature that is based on a corresponding temperature of the extruded cellulose-NMMO solution, cementing the seam of the preheated tube with pure NMMO or cellulose-NMMO solution, allowing the tube with the cemented seam to be carried through a nozzle block in order to extrude the cellulose-NMMO solution on to the tube and penetrate it, such that an insert-reinforced film tube is obtained, and wherein the interior of the film tube is filled with an aqueous NMMO solution, and allowing the film tube to exit from the nozzle block and enter into a spin bath.