Method for processing plastic material
AssigneeEngel Maschinenbau Gesellschaft m.b.H.
InventorGeorg Steinbichler
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Abstract
A method of processing plastic material, wherein the plastic material is pressure-lessly distributed over the lower mold half of a mold divided in a horizontal plane, then the mold is closed and the mold cavity is entirely filled with molten material whereupon a fluid is injected into the molten material and a portion of the molten material is displaced into a secondary cavity by the fluid.
Claims6
A method of processing plastic material in a mold having a lower mold half, an upper mold half, the upper and lower mold halves having a closed position against each other and defining a mold cavity between the upper and lower mold halves, the upper and lower mold halves being divided along a horizontal plane and having an open position, the method comprising the steps of:
- depositing a molten plastic material cake, pressure-lessly onto the lower mold half while the mold is in said open position;
- moving the upper and lower mold halves into the closed position for closing the cavity and thereby spreading the molten plastic material cake to completely fill the mold cavity;
- providing a secondary cavity which communicates with the mold cavity;
- and
- injecting a fluid under pressure into the molten plastic material cake filling the mold cavity thereby displacing some of the first molten plastic material into the secondary cavity.
A method of processing plastic material in a mold having a lower mold half, an upper mold half, the upper and lower mold halves having a closed position against each other and defining a mold cavity between the upper and lower mold halves, the upper and lower mold halves being divided along a horizontal plane and having an open position, the method comprising the steps of
- depositing a first molten plastic material cake, pressure-lessly onto the lower mold half while the mold is in said open position;
- moving the upper and lower mold halves into the closed position for closing the cavity and thereby spreading the first molten plastic material cake to completely fill the mold cavity;
- providing a secondary cavity which communicates with the mold cavity;
- and
- injecting a second molten plastic material into the first molten plastic material cake filling the mold cavity thereby displacing some of the first molten plastic material into the secondary cavity.
A method as set forth in clam 4 wherein the second plastic material contains reinforcing fibers.
Dependencies are inferred from the claim text.