| 摘要 |
A process for making helmets for cyclists which includes steps of a) pre-heating a mold; b) putting a printing ink-coated plastic film or sheet to the lower die of the mold; c) letting the plastic film or sheet be heated to deform and to closely adhered to the cavity on the lower die; d) filling a polyurethane liquid; closing the upper die of the mold; e) putting the mold in a reactor for foaming; f) shape forming; g) mold stripping; i) trimming and vent hole making; and j) packing.
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