Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Reexamination Certificate
2000-03-22
2001-11-27
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
C264S314000, C264S328700, C425S405100, C425S552000
Reexamination Certificate
active
06322349
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a mold for injection compression molding for producing lengthy injection molded products with a flow length in the mold opening direction such as a synthetic resin bottle.
BACKGROUND OF THE INVENTION
In the said injection mold based on the conventional technology, as shown in
FIG. 5
, a core
22
is movably provided inside a rigid cavity
21
between a closing position and an opening position of the mold, synthetic resin is filled via a gate
24
of a cavity
21
in a gap
23
between the cavity
21
and the core
22
, the synthetic resin is kept and cooled in a pressurized state, then the core
22
moves to the mold opening position, and the molded product
25
is taken out from the core
22
.
In the injection mold as described above, when a molded product with a large flow length in the mold opening direction, namely with a large flow ratio of a flow length/thickness is molded, increasing thickness when filling is effective to make it easier to fill synthetic resin in the gap
23
. The method of utilizing a mold opening to achieve the objective is well known, but in this method, there is the problem that, assuming the mold opening rate DY as shown in
FIG. 5
, thickness of a bottom surface of a molded product
25
increases by DY, but thickness of a side surface only by DY sin &thgr;, namely that, assuming &thgr; of 5 ° and DY of 1 mm, thickness of a bottom surface is 1 mm, but that of a side face is 0.09 mm, which is too thin to achieve the thickness effect.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a mold for injection compression molding which can overcome the problems in the conventional type of injection compression mold and also can easily produce a molded product with a large flow ratio in the mold opening direction.
To achieve the object as described above, the present invention provides an injection compression mold in which an elastic inner cavity with low rigidity and expandable in a direction perpendicular to the mold opening direction is provided in a rigid outer cavity, and when resin is filled in this inner cavity, the inner cavity expands due to a filling pressure of the resin, and when the mold is kept and cooled in a pressurized state, the inner cavity shrinks, so that a molded product with desired thickness in a direction perpendicular to the mold opening direction can be obtained.
REFERENCES:
patent: 1689533 (1928-10-01), Parker
patent: 3660002 (1972-05-01), Morroni
patent: 5204042 (1993-04-01), James et al.
Horaoku Yukio
Kambe Takahide
Fulbright & Jaworski L.L.P.
Heitbrink Tim
Kata Systems Company
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