Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Cutting and uniting cut parts
Patent
1991-12-30
1992-12-01
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Cutting and uniting cut parts
2642101, 264259, 425297, B29C 6578, B29C 6900
Patent
active
051678926
ABSTRACT:
A method for forming an annular member simply with high accuracy, for example, a side tread and bead filler having a height in the radial direction comparatively larger than its thickness as a constituent member of a tire. A material, for example, a soft and fragile raw rubber at a high temperature is directly extruded through a mouthpiece of an extruder onto a rotating disc-like lower mold so as to adhere onto it. The lower mold is able dividable into plural lower mold segments. An arcuately curved extruded material is formed on the lower mold in this manner. The extruded material is not deformed during being cooled because it is strongly restrained by the receiving surface of the lower mold on which the material adheres. The extruded material is then cut along the divided lines of the lower mold segments. Lower mold segments thus having arcuately extruded materials, respectively, are then transferred to a restoration position and gathered together to form the original lower mold. Thereafter, ends of the arcuately extruded materials are joined with each other to form an endless annular member.
REFERENCES:
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patent: 4076785 (1978-02-01), Schmidt
patent: 4198367 (1980-04-01), Burrell
patent: 4888074 (1989-12-01), Pocknell
patent: 4971544 (1990-11-01), Schneeberger
patent: 5069849 (1991-12-01), Wain
Hoso Yukihiko
Yokoi Takashi
Bridgestone Corporation
Heitbrink Jill L.
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