Procedure for extrusion of plastic material and extruder

Details Procedure for extrusion of plastic material and extruder Procedure for extrusion of plastic material and extruder

B - Operations, Transporting

29

C

B29C 47/10 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2702981

The invention relates to a method for extruding plastic material using a screw- type extruder (S), wherein a first pressure (PI) of the material to be extruded is measured in at least one location in the feed region (EB) of the at least one screw (2) and/or in the melting region (A) of the housing (1). the plastic material agglomerating and/or softening and being present in and not yet, in particular not completely, melted state and/or being present not yet homogeneously as a melt in said location or in said melting region. According to the invention, the material supply to the extruder (S) and/or the charge quantity is measured or controlled as a function of the measured first pressure (P1).

L'invention concerne un procédé d'extrusion de matière plastique avec une extrudeuse à vis sans fin (S), sachant qu'une première pression (P1) de la matière à extruder est mesurée en au moins un endroit dans la zone d'alimentation (EB) de la ou des vis sans fin (2) et/ou dans la zone de fusion (A) du carter (1), sachant qu'en cet endroit ou respectivement dans cette zone de fusion, la matière plastique est agglomérée et/ou ramollie et non encore fondue, notamment non encore totalement fondue, et/ou n'est pas encore présente sous forme de masse fondue homogène. Selon l'invention, on calcule ou on ajuste l'apport de matière à l'extrudeuse (S), et/ou la quantité de matière chargée, en fonction de la première pression mesurée (P1).

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