초록 ▼

An extruder wherein the housing which defines a passage for the flow of foamed plastic material at elevated pressure and temperature to the shaping station contains a reciprocable carrier of one or more filters. The carrier has a filter compartment and is movable relative to the housing between a fi

An extruder wherein the housing which defines a passage for the flow of foamed plastic material at elevated pressure and temperature to the shaping station contains a reciprocable carrier of one or more filters. The carrier has a filter compartment and is movable relative to the housing between a first position wherein the plastic material must flow from the inlet of the passage, through the compartment and the filter therein, and on to the outlet of the passage, and a second position in which the compartment is sealed from the passage. An expansion chamber in the housing and/or in the carrier communicates or can be caused to communicate with the compartment in the second position of the carrier so as to allow for a controlled reduction of pressure of plastic material before the compartment is made accessible for removal of inspection of the filter in the compartment. The compartment is thereupon rendered accessible, either in the second position of the carrier or by moving the carrier to a further position.

대표청구항 ▼

In an apparatus for processing foamed plastic material, a housing member defining a passage for the flow of foamed plastic material at elevated pressure, said passage having an inlet and an outlet spaced apart from said inlet; a carrier member movably installed in said housing member and having a co

In an apparatus for processing foamed plastic material, a housing member defining a passage for the flow of foamed plastic material at elevated pressure, said passage having an inlet and an outlet spaced apart from said inlet; a carrier member movably installed in said housing member and having a compartment and filter means in said compartment, at least one of said members having at least one expansion chamber and at least one of said members being movable relative to the other of said members between a first position in which said compartment connects said inlet with said outlet so that plastic material must flow through said filter means on its way from said inlet to said outlet and a second position in which said compartment is sealed from said inlet and is connected or connectable with said expansion chamber so that the expansion chamber receives pressurized plastic material to thus relieve the pressure in said compartment.