Process for making helmets for cyclists

Details Process for making helmets for cyclists Process for making helmets for cyclists

1993-05-24

1994-12-27

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264 466, 264132, 264135, 264156, 264161, B29C 6722

Patent

active

053763181

ABSTRACT:
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.

REFERENCES:
patent: 3950483 (1976-04-01), Spier
patent: 4129634 (1978-12-01), Cecka et al.
patent: 4228211 (1980-10-01), Haazebroek
patent: 4288268 (1981-09-01), Hartung
patent: 4473208 (1984-09-01), Nava
patent: 4849145 (1989-07-01), Hirsch

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