Patent ID: 7992224

Claim:
A method for manufacturing said crown for waterproof cap includes following step: (a) cut out the six panels (21˜26) made of synthetic fibers, each panel has an overall triangular shape with both left and right sides are slightly arched with a flat bottom side in between; (b) two adjacent panels piled to the sides, which are welded together by a high frequency plastic welding machine further equipped with a circular cutter ( 50 ) to cut off leftovers ( 51 ) immediately, after cutting, left piled sides melt together to form a seam ( 27 ); as the six panels (21˜26) are assembled together to form a crown ( 20 ), three diagonal seams ( 27 ) formed on an inner surface of the crown; (c) stickers (41˜43) contain thermoplastic membrane ( 40 ), which is heated by hot air to melt together to the stickers (41˜43), and then the stickers (41˜43) are pressed along the diagonal seams ( 27 ) inside the crown ( 20 ); each of the stickers (41˜43) are added to cover up each seam between two adjacent panels to seal the seams ( 27 ), thus the waterproof crown ( 20 ) is shaped with reduced seams and stitches.