Process and apparatus for injection molding tire treads

Details Process and apparatus for injection molding tire treads Process and apparatus for injection molding tire treads

1985-07-31

1986-08-05

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing toroidal work

249 83, 249 91, 249105, 249107, 264135, 264161, 264275, 264279, 264315, 2643283, 425112, 425115, 425127, 425129R, 425542, 425544, 425546, B29D 3006, B29C 4502, B29C 4514

Patent

active

046042563

ABSTRACT:
Injection molding a tread on an annular tire casing (44) positioned in a mold (10') by introducing a fluid molding compound (76',78') at high pressures and high temperatures into a tread molding space (105) through runner passages (114) extending from an edge (116) to a centerplane (20'--20') of the mold (10') and having gates (118) opening into the tread molding space (105). Alternatively the runner passages (56,58) may be defined by annular runner surfaces (60,62,64,66) in communication with the tread molding space (48) through annular gates (52,54). The fluid molding compound (76,78) may be ejected from annular transfer recesses (68,70) in the mold (10) by squeeze rings (84,86) movable into the transfer recesses (68,70) to introduce the fluid molding compound (76,78) into the runner passages (56,58).

REFERENCES:
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patent: 2724425 (1955-11-01), Ostling
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patent: 3868203 (1975-02-01), Turk
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patent: 4139592 (1979-02-01), Gallizia
patent: 4140454 (1979-02-01), Calori
patent: 4166832 (1979-09-01), Gallizia
patent: 4181482 (1980-01-01), Grawey et al.
patent: 4257994 (1981-03-01), Leblanc et al.
patent: 4309161 (1982-01-01), Krebs et al.

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