Importance

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Abstract

A method for producing a thermoplastic resin string roll of the present invention uses a core made of a plurality of core pieces that are arranged along a circumference and can move back and forth in a diameter direction, the outer faces of the core pieces forming a part of a cylinder when the core pieces are extended in the diameter direction. The end of a thermoplastic resin string is fixed, while the core pieces of the core are extended in the diameter direction. Then, the core is rotated to wind the thermoplastic resin string a plurality of times around the periphery of the core. Thereafter, supersonic vibration is applied to a plurality of layers of the thermoplastic resin string that is wound round the core via a horn, thereby causing frictional heat, so that the plurality of layers of the thermoplastic resin string are connected by thermal fusion due to the frictional heat, and then the thermoplastic resin string is wound to produce a roll. The plurality of layers of the thermoplastic resin string are connected by inserting the horn in the thermoplastic resin string and drilling while melting.

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First Claim