Multi-filament split-yarn sheet and method and device for the manufacture thereof

A method of producing a multi-filament spread sheet comprising the steps of:

• oversupplying a multi-filament comprising plural filaments under feeding control from a yarn supply section to a yarn winding section;
• combining multi-filament spread sheets which are produced by a multi-filament spread operation where moving multi-filaments are subjected to air blowing crosswise therewith, into plural stages or disposing those sheets in parallel to each other;
• and
• further performing said spread operation on such multi-filament spread sheets as combined into plural stages or disposed in parallel to each other, thereby, producing a complex multi-filament spread sheet.

An apparatus for producing a multi-filament spread sheet having a width and a thickness comprising:

• a means for oversupplying a multi-filament under feeding control;
• a suction cavity arranged in such a manner that said cavity opens towards a feeding course substantially perpendicular to the width of said multi-filament between a yarn supply section and a yarn winding section;
• and
• wherein the cavity continuously subjects said multi-filament to suction air which archly bends and spreads said multi-filament.

An apparatus for producing a multi-filament spread sheet comprising:

• a yarn supply unit carrying a yarn supply section for rotatably feeding a course of a multi-filament having plural filaments between a yarn supply section and a yarn winding section, wherein a winding direction of the multi-filament at the yarn supply section immediately before being released therefrom aligns the feeding course of the multi-filament released from the yarn supply section, and said yarn supply section is arranged on said yarn supply unit so that it can axially move back and forth thereon;
• a preliminary extension mechanism to preliminarily extend the multi-filament supplied from the yarn supply unit;
• a feeding control mechanism to control the multi-filament preliminarily extended by said extension mechanism so that said multi-filament is oversupplied by a certain amount;
• a suction cavity to perform a multi-filament spread operation by archly bending the multi-filament oversupplied by a certain amount under the feeding control mechanism in such a manner that said multi-filament is continuously subjected to suction air, wherein the multi-filament is spread into the filaments and transformed into the multi-filament spread sheet;
• a yarn winding section to wind up the multi-filament spread sheet on which said spread operation by means of the suction cavity is performed.

An apparatus for producing a multi-filament spread sheet comprising:

• a yarn supply unit carrying a supply means of a multi-filament, said unit aligning the releasing direction of a multi-filament unwound from said supply means with the moving direction thereof towards a yarn winding means by rotating and moving back and forth said supply means;
• an extension mechanism to press a multi-filament to be fed from said supply unit and extend the same to the width direction thereof;
• at least one suction cavity disposed in the moving direction of an extended multi-filament;
• an oversupply control means to check how far said multi-filament has bent in this suction cavity.