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1. (WO2017060399) METHOD OF MANUFACTURING A TOBACCO POUCH

Pub. No.:    WO/2017/060399    International Application No.:    PCT/EP2016/073953
Publication Date: Fri Apr 14 01:59:59 CEST 2017 International Filing Date: Sat Oct 08 01:59:59 CEST 2016
IPC: B29C 65/08
A24F 23/02
B29L 9/00
Applicants: IMPERIAL TOBACCO LIMITED
Inventors: GOODALL, Chris
ROBINSON, Gary
Title: METHOD OF MANUFACTURING A TOBACCO POUCH
Abstract:
The invention refers to a method of manufacturing a tobacco pouch, wherein a workpiece, comprising at least three layers (26) of a thin material, is placed between a welding surface (38) of an anvil (32) and a welding surface (38) of a sonotrode (24) of an ultrasonic welding tool (30) and wherein the layers (26) are then sectionally joined in an ultrasonic welding process, wherein the respective welding surface (38) of at least one of said sonotrode (24) and/or said anvil (32) comprises a plurality of welding structures (40) that are spaced in a first direction (42) and in a second direction (44) to form a pattern (50) wherein each of said welding structures (40) comprises a plateau (48) and at least one descending side surface (54), wherein the descending side surface (54) is initiated by an edge (52) of the plateau (48). According to the invention opposing side surfaces (54) of at least two adjacent welding structures (40) are interconnected at a bottom part (58). The invention further refers to an ultrasonic welding tool (30) designed to be applied in the method of the invention and to a tobacco pouch, manufactured by a method of the invention.