Ball for ball game and method for manufacturing the same
作者： Hideomi Shishido , Yoshihisa Okimura , Shigeo Doi , Harufusa Taniguchi
DOI:
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摘要: To provide a ball for game and method manufacturing the having superior sphericity, an ability to retain its original shape, durability, soft feel. The fabric layer (12) is formed by sewing with machine instance pentagonal first pieces (13) together composite shaped second (14) in which two hexagons are connected each other, so that spherical shape formed. marginal edge of superimposed surface direction, corner portions thereof temporarily attached. Temporary attachment achieved inserting needle into through hole pieces, welding means ultra sonic wave, such (13, 14) accurately aligned. attached sewn using along guiding line (17) printed beforehand on 14).
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