Static molds – Including static filling means in contact with mold cavity
Patent
1997-12-29
2000-02-29
Heitbrink, Jill L.
Static molds
Including static filling means in contact with mold cavity
249109, 2643284, 26432815, 425543, 425549, 425567, B29C 3924
Patent
active
060299444
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a casting device and an adapter for a casting device according to the preamble of the respective independent patent claim.
Casting devices of that kind are known for the manufacture of a wide variety of castings. Such devices specifically for the manufacture of relatively thin-walled castings, such as plastics basins or similar objects, are known, for example, from-the European Patent Application with the publication number EP-A-0 629 483, which describes a method of manufacturing such thin-walled castings, for example decorative panels, and an appropriate casting mould. The inlet opening into the shaping zone of the casting mould, which shapes the future casting, extends similarly over a major portion (30% to 100%) of the length of the shaping zone and of the future casting. This is of advantage insofar as there is as a result no pronounced turbulence of the plastics as it is introduced into the casting mould, and consequently the decorative particles contained in the plastics which is to be cured are prevented from being swirled to such an extent as a result of the turbulence that a visibly inhomogeneous distribution of the decorative particles is produced in the casting.
That process, and the casting mould associated with it, are operationally efficient in principle but do still have certain disadvantages. The feed means, that is to say the channel, through which the thermocurable plastics, for example an epoxy resin, is fed into the shaping zone of the casting mould, is integrated into the mould. Since the mould temperature must lie above the gelation temperature of the epoxy resin, during the manufacture of the casting (during the thermal curing) the epoxy resin in the feed means is likewise thermally cured, adheres to the casting when the casting has been released from the mould and then has to be removed as waste. In view of the fact that the channel extends at least over the length of the inlet opening and beyond, that waste is in some cases very considerable.
Furthermore, the feed means integrated into the casting mould may also become blocked, because the thermal curing process takes place in the feed means too, since (as an integral component of the casting mould) it, too, is heated to a temperature above the gelation temperature. On thermal curing of the plastics in the shaping zone of the casting mould, shrinkage usually occurs during curing, the shrinkage being compensated by the required amount of epoxy resin then being supplied through the feed means (channel) by a corresponding pressure being applied to the liquid epoxy resin. If that channel is completely or partly blocked, the supplementary supply of epoxy resin may be inadequate, which may result in surface shrinkage, cavities or an only incompletely poured casting. Even if that is not the case, however, the (blocked) feed means must nevertheless be cleaned after the manufacture of each casting, which on the one hand incurs expense and on the other hand leaves the casting mould unused for that period of time. In addition, the production of the casting mould is more difficult and more expensive insofar as the feed means, as a component part of the casting mould, has to be recessed into the mould.
An aim of the invention is therefore to eliminate the above-mentioned disadvantages, that is to say to propose a casting device in which as little waste as possible is produced during the manufacture of the castings, in which blockage and subsequent cleaning of the feed means are avoided as fully as possible and in which the manufacture of the casting mould is as simple as possible.
That aim is achieved by a casting device and by an adapter as described in the latter part of the respective independent patent claim.
The casting device according to the invention comprises a separate adapter in which the feed means for the plastics is arranged. The adapter can be connected to the casting mould in such a manner that, when the adapter has been connected, an outlet opening provided in the adapter is arranged sealed to and subs
REFERENCES:
patent: 3426116 (1969-02-01), Walters
patent: 3428289 (1969-02-01), Heckrotte et al.
patent: 3819312 (1974-06-01), Arpajian
patent: 3837777 (1974-09-01), Hunten et al.
patent: 4097928 (1978-06-01), Fries
patent: 4309379 (1982-01-01), Dannels et al.
patent: 4318686 (1982-03-01), Morgan
patent: 4980111 (1990-12-01), Majerus
Abstract--vol. 13 No. 13 (M-783) [3361] Jan. 12, 1989 of JP 63-222826.
Abstract--vol. 12 No. 057 (M-670) of JP-A-62 204905.
Saner Niklaus
Wombwell Paul Terrence
Ciba Specialty Chemicals Corp.
Crichton David R.
Heitbrink Jill L.
Kovaleski Michele A.
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