Abstract A method for forming spherically swollen headed filaments on a base fabric in a fabric fastener, comprising the steps of forming a number of projecting filaments of thermoplastic resinous material on one surface of a base fabric, soaking the base fabric in viscous liquid in a container, removing the base fabric from the liquid thereby forming a liquid layer among the projecting filaments, and then passing the base fabric along a heater, heating in such a manner that the one surface having the projecting filaments with liquid layer faces against the heater and is subjected to heat of the heater whereby exposed terminals of the filaments caused by evaporation of the liquid are melted and swelled by surface extension, thereby forming spherically swollen headed filaments on the base fabric.
A method for forming spherically swollen headed filaments on a base fabric of a fabric fastener, comprising the steps of: forming a number of projecting filaments having free ends and made of thermoplastic resinous material on one surface of a base fabric, soaking said base fabric in viscous liquid in a container, removing said base fabric from said container thereby forming a liquid layer on said base fabric among said projecting filaments, and then passing said base fabric along a heater and heating same in such a manner that said one surface of said base fabric having said projecting filaments with liquid layer faces said heater and subjecting said projecting filaments and liquid layer to heat of the heater such that said liquid layer evaporates to expose free ends of said filaments and to the extent of said evaporation of said liquid layer the exposed free ends of said filaments are melted and swelled by surface extension to spherically swollen headed filaments on said base fabric.
Claim 2
Independent Claim
166 words
A method for forming spherically swollen headed filaments on a base fabric of a fabric fastener, comprising the steps of: forming a number of projecting filaments having free ends and made of thermoplastic resinous material on one surface of a base fabric, soaking said base fabric in viscous liquid in a container, removing said base fabric from said container thereby forming a liquid layer on said base fabric among said projecting filaments, and then passing said base fabric along a heater and heating same in such a manner that said one surface of said base fabric having said projecting filaments with liquid layer faces said heater and subjecting said projecting filaments and liquid layer to heat of the heater such that said liquid layer evaporates to expose free ends of said filaments and to the extent of said evaporation of said liquid layer the exposed free ends of said filaments are melted and swelled by surface extension to spherically swollen headed filaments on said base fabric.
Claim 3
Dependent Claim
16 words
The method, as set forth is claim 1, wherein said projecting filaments are made of polypropylene.
Claim 4
Dependent Claim
20 words
The method, as set forth in claim 1, wherein: said base fabric having said projecting filaments constitutes an elongated strip.