Pressure-regulated mold-filling apparatus for thermosetting material
AssigneeWilhelm Hedrich Vakuumanlagen GmbH & Co. KG
InventorErhard Hauser
Life of this patent
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Abstract
Flowable thermosetting synthetic-resin material is fed to a plurality of pressurizable buffer compartments and then to a plurality of respective molds having differently dimensioned mold cavities. Each of these compartments is pressurized so as to maintain pressure on the molten material in the respective molds during the molding and curing operation, during which time the pumps that feed the material to the compartments may be stopped. Each of the buffer compartments has sensing means which operate the pumps of the system.
Claims12
An apparatus for feeding at least one mold with a thermosetting synthetic resin comprising:
- supply receptacle means including at least one supply receptacle constituting a source of the thermosetting synthetic resin;
- pumping means including at least one pump connected to said source for delivering the thermosetting synthetic resin at an output side of said pump means;
- and
- means connecting said output side of said pumping means to each such mold, said connecting means including
- a respective buffer vessel between each mold and said output side of said pumping means, each buffer vessel having an inlet connected with said output side and an outlet connected with the respective mold whereby the thermosetting synthetic resin in a reactive state passes through a compartment in the respective vessel before entering the respective mold,
- a respective valve at each of said inlets for shutting the respective compartment off from said pumping means,
- a shiftable respective wall in each vessel,
- fluid-pressure means for displacing each wall to vary the volume of the compartment defined by the respective wall and traversed by the thermosetting synthetic resin between the respective inlet and outlet,
- a first sensor responsive to the position of said wall for detecting a minimum-volume state of the respective compartment,
- a second sensor responsive to the position of said wall for detecting a minimum-volume state of said compartment, and
- means responsive to said sensors for control of at least one of said pumping means and said valve to regulate the throughput of the respective vessel.
An apparatus for feeding at least one mold with a thermosetting synthetic resin comprising:
- supply-receptacle means including at least one supply receptacle constituting a source of the thermosetting synthetic resin;
- pumping means including at least one pump connected to said source for delivering the thermosetting synthetic resin at an output side of said pump means;
- and
- means connecting said output side of said pumping means to each such mold, said connecting means including
- a respective buffer vessel between each mold and said output side of said pumping means, each buffer vessel having an inlet connected with said output side and an outlet connected with the respective mold whereby the thermosetting resin in a reactive state passes through a compartment in a respective vessel before entering the respective mold, a respective valve of each of said inlets for shutting the respective compartment off from said pumping means,
- a respective shiftable wall in each vessel,
- fluid-pressure means for displacing each wall to vary the volume of the compartment defined by the respective wall and traversed by the thermosetting synthetic resin between the respective inlet and outlet,
- a sensor responsive to the position of said wall for detecting a minimum-volume state of the respective compartment, the pumping means being constructed and arranged to fill the respective compartment with a predetermined quantity of said resin and thereby the position of said wall in a maximum-volume state of the respective compartment is reached, and
- means responsive to said sensor for control of at least one of said pumping means and said valve to regulate the throughput of the respective vessel.
Dependencies are inferred from the claim text.