Structured yarn for industrial textile applications, e.g. in filters, comprises transverse monofilament strands hooked onto longitudinal strands to form loops in several orientations

摘要

#CMT# #/CMT# In a structured yarn comprising a longitudinal strand (BC0, BL1, BL2) associated with transverse strand(s), the transverse strands comprise one or more monofilaments hooked onto the longitudinal strand to form loops in several orientations along the length of the longitudinal strand. #CMT# : #/CMT# Independent claims are included for: (1) the production of a textile yarn, by (a) knitting a strip having regular flat transverse loops, regularly distributed along at least one longitudinal strand and (b) twisting the knitted product along the length of the longitudinal strand, to cause regular helicoidal winding of the loops; and (2) a machine for carrying out the process (no description given). #CMT#USE : #/CMT# The yarns are specifically used in industrial textile applications, e.g. for retaining solid or semi-solid, organic or chemical materials (such as sludge, ice or soil), in filters or as damping material for replacing foams. The yarns are structured to provide a textile support with specific abrasion and retention characteristics for a specific application. #CMT#ADVANTAGE : #/CMT# The yarns are satisfactory as regards both performance and cost. The oriented loops provide a structure well adapted to retention and/or filtration. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a perspective view from above of part of a structured yarn during its production, as a strip-form intermediate product. BC0 : Central longitudinal strand BL1, BL2 : First and second additional longitudinal strands BT1a, BT1b, BT1c, BT1x : Loops in first transverse strand BT2x : Loop in second transverse strand F : Yarn #CMT#POLYMERS : #/CMT# Preferred Materials: At least some of the longitudinal strands and the filaments are of polyolefin, polyester or polyamide and/or of metal. #CMT#TEXTILES AND PAPER : #/CMT# Preferred Structure: The loops in several orientations are wound helicoidally by tension starting from initially produced flat loops, and are connected to one or more longitudinal strands (BC0, BL1, BL2). The longitudinal strands, and at least some of the filaments, are not rotted or altered by water. Preferred Process: The process also includes the stage of winding the twisted yarn on a bobbin, with rotation accompanied by to and fro movement to cause regular winding of the bobbin, the twisting and winding steps optionally being at least partially simultaneous.