| 摘要 |
<p>The present invention concerns a helmet H comprising a shell 10 formed from a thermoplastic resin, for example, by blow molding or injection molding, and a shock absorbing liner 20 disposed to the inside of the shell 10. Then, the shock absorbing liner 20 is formed of polyvinylidene chloride foams. By the constitution of the shock absorbing liner 20 with polyvinylidene chloride foams, it is possible to provide a helmet having less temperature dependent change of the compression strength upon molding, is excellent in the shock absorption and restorability, excellent also in impact shock absorbing performance upon second hitting on one identical portion and also excellent in the dimensional accuracy upon manufacture. <IMAGE></p> |
