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Method for pressing a plastic, which cures by means of a reaction, into a mould cavity, a pressing auxiliary in pill form to be used in this method and a holder composed of such material
| Details |
Inventors: Pas, Ireneus J. T. M.;
Assignee: "3P" Licensing B.V. (Rozendaal, NL)
Primary Examiner: Heitbrink; Jill L.
Assistant Examiner:
Attorney, Agent or Firm: Jaskiewicz; Edmund M.
Method for pressing a plastic (6), which cures by means of a reaction, from a displacement chamber (4) via at least one injection channel (3) and a gate (2) to a mould cavity (1), said method at least comprising the following steps: pressurising the plastic (6) with an amount of a pressing auxiliary (7) in the displacement chamber (4); pressing the plastic (6) into the mould cavity (1); and allowing the plastic to cure under pressure in the mould cavity, the pressing auxiliary (7) being plastically deformable under the conditions of pressing and the amount thereof being sufficient to be pressed to the vicinity of the gate (2) of the mould cavity (1). Preferably the pressing auxiliary (7) is a thermoplastic. |
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DETAILED DESCRIPTION I claim: 1.
A method of pressing a plastic, which cures by means of a reaction, from a displacement chamber through an injection channel and a gate into a mold cavity and comprising the steps of positioning a plastic to be pressed and a pressing auxiliary in a displacement chamber, pressurizing the pressing auxiliary and the plastic and pressing the plastic into the mold cavity, allowing the plastic in the mold cavity to cure while under pressure, the quantity of the pressing auxiliary in the displacement chamber being sufficient to be pressed to the vicinity of the gate of the mold cavity, the pressing auxiliary comprising a material which is plastically deformable under conditions of the pressing and reversibly coagulates or hardens after pressing.
2.
Method according to claim 1, wherein under the conditions of pressing, the pressing auxiliary has a higher viscosity than the plastic which cures by means of a reaction.
3.
Method according to claim 1, wherein said pressing auxiliary is a thermoplastic.
4.
Method according to claim 1, wherein said pressing auxiliary is pressed in pill form in the displacement chamber.
5.
Method according to claim 1, wherein said pressing auxiliary comprises a holder for the plastic which cures by means of a reaction, such that the holder can be processed after filling with said plastic.
6.
A pressing auxiliary in pill form, made of a material which is being plastically deformable under conditions of pressing and reversibly coagulates or hardens after pressing for use in a method of pressing a plastic, which cures by means of a reaction, from a displacement chamber through an injection channel and a gate into a mold cavity and comprises the steps of positioning a plastic to be pressed and a pressing auxiliary in a displacement chamber, pressurizing the pressing auxiliary and the plastic and pressing the plastic into the mold cavity, allowing the plastic in the mold cavity to cure while under pressure, the quantity of the pressing auxiliary in the displacement chamber being sufficient to be pressed to the vicinity of the gate of the mold cavity
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