PURPOSE: To form a frame for a game racket by helically winding a tow of a filament material and a thermoplastic material.
CONSTITUTION: In an embodiment of disperse winding, the first revolution of a filament material is shown by a tow 20 wound around the longitudinal axis 13 of a rotating core at +α° and a tow 21 wound around the core at -α°. In the next revolution, a tow 22 is wound at +α° and a tow 23 is wound at -α°. In next revolution selected by a planner, a different winding mold is used and a tow 24 is wound at +β° and a tow 25 is wound at -β°. Angles of a series of windings are arbitrary. Therefore, the arbitrary dispersion of winding revolution obtained by disperse winding technique brings about the three- dimensional coupling of fibers. Even after a tube is detached from the core, the coupled fibers hold the perfect structural state of a wound tube.
DEIBUITSUDO DABURIYU REPETOO
DEIBUITSUDO EI POOROTSUKU
