The present invention, when applied strong impact of the ball, durable without breaking, and to provide a repulsive force bowling pins and a method of manufacturing.
Bowling pin has a surface skin portion 15 which covers the outer surface of the synthetic resin core member 3 and the core material. The core material has an upper hollow portion 5a and a lower hollow portion 5b, the top cap 9 on the upper hollow portion has lower cap 13 is mounted on the lower hollow portion. Furthermore, it is provided reinforcing the core 3a and / or elastic strip 4a.
The bowling pin, mold and fixed in a state mounted on the cap on the core material is prepared by forming a skin portion by injecting a molten resin around the core material.
When providing a reinforcing core sets the reinforcing core on the core material molding die to form a core material and insert casting by injecting molten resin around the reinforcing core, using the core material.
When an elastic band, may be provided a circumferential groove around the core, to form an elastic band by filling a synthetic resin circumferential groove.