METHOD AND DEVICE FOR EXTRUDING PLASTIC MATERIAL OR THE LIKE

Extruding apparatus comprises a first screw extruder feeding into the inlet of a second screw extruder, such inlet being located at an intermediate position between the driving means and the discharge of the second extruder. Degassing means which applies a vacuum to the material fed into the second...

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Bibliographische Detailangaben
1. Verfasser:	KURAUSU KOTSUHO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Extruding apparatus comprises a first screw extruder feeding into the inlet of a second screw extruder, such inlet being located at an intermediate position between the driving means and the discharge of the second extruder. Degassing means which applies a vacuum to the material fed into the second extruder tends to draw off particles of material entrained in the gas which is drawn off. The screw of the second extruder has a first screw portion which acts in a direction to propel the main mass of material from the inlet to the discharge of the second extruder and a second screw portion which acts in the opposite direction to propel the drawn off material from the inlet to an outlet which is located between the inlet and the driving means and which opens into a vacuum chamber. A third screw portion located between the outlet and the driving means acts in the same direction as the first portion and hence toward the outlet.