US 6,883,953 B1Granted

Apparatus for pre-treatment and subsequent plastification or agglomeration of synthetic plastic materials

OwnerHelmut Bacher, Helmuth Schulz +1inventors

InventorsHelmut Bacher, Helmuth Schulz, Georg Wendelin

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Abstract

An apparatus for pre-processing and subsequent plastification or agglomeration of synthetic plastic materials, in particular thermoplastic waste plastics for recycling purposes, has a receptacle (1) in which at least one comminuting tool (6) circulates. The housing (7) of a screw (8) is connected to the receptacle (1). The diameter (D) of the receptacle (1) has the following relationship to the screw diameter (d): D=10.{square root over (K.d2)}, wherein D is the inner diameter of the receptacle in mm, d is the screw diameter in mm and K is a dimension-less constant which amounts to at least 190. Thereby the dwell times of the synthetic plastic material within the receptacle (1) are kept at optimal values.

Claims13

Dependent claims

Apparatus for pre-treatment and subsequent plastification or agglomeration of synthetic plastic material comprising a receptacle that has an intake opening for the material to be processed, and in which at least one circulating comminuting and/or mixing tool is disposed, whereby the material preprocessed within the receptacle is fed into a housing of a screw plasticizing or agglomerating the material, the housing bang connected to the receptacle, wherein a diameter (I) of the receptacle is kept in the following relation with respect to a diameter (d) of the screw:

D=10.{square root over (K.d2)}, wherein
D is the inner diameter of the circular-cylindrical receptacle in mm or the inner diameter in mm of a fictitious circular cylindrical receptacle having the same capacity and the same height,
d is the diameter of the screw in mm and
K is a constant which is greater than or equal to 190.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/130,814Filed 29 Sep 2000
Priority: AT 2033992 Dec 1999
Granted: 26 Apr 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B29B 17/0026
Recovery of plastics or other constituents of waste material containing plastics: by agglomeration or compacting
B29C 48/2888
In solid form, e.g. powder or granules: in thread form or in strip form, e.g. rubber strips
B29C 48/397
Using screws surrounded by a cooperating barrel, e.g. single screw extruders: using a single screw
B29C 48/53
Screws: having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk