Basic Introduction Of Twin Screw Extruder

In a twin screw extruder including a barrel, which has two screws disposed in parallel

in its inside and an opening at one edge, and an extrusion molding die disposed to the opening side of the barrel through a straightening vane and a filter net, the straightening vane includes a first straightening vane and a second straightening vane, the first one has a hole forming region having plural through holes formed in a region whose size and shape are in agreement with the size and the shape of the inner periphery of the opening portion, and the second one has a hole structure whose size and shape of its inner periphery at one opening edge are in agreement with the size and the shape of the hole forming region, and its sectional area is reduced once in a process to the other opening edge and then expanded in a taper shape.

A twin screw extruder comprising: a barrel, which has two screws disposed in parallel in the inside thereof and an opening at one edge, each of the two screws extending along an axis of each screw; and an extrusion molding die disposed to the opening side of the barrel through a straightening vane and a filter net, wherein: the straightening vane comprises a first straightening vane and a second straightening vane, the first straightening vane has a hole forming region in which a plurality of through holes are formed in a region whose size and shape are in agreement with the size and the shape of the inner periphery of the opening, the hole forming region having a gourd shape formed by coupling two circles having the same diameter and being partly overlapped with each other, the two circles being in a plane substantially perpendicular to the axes of the two screws and having respective centers, each center located at a point in the plane where the axis of a screw intercepts the plane, and the second straightening vane has such a hole structure that the size and the shape of the inner periphery thereof at one opening edge are in agreement with the size and the shape of the hole forming region and the sectional area thereof is reduced once in a process to the other opening edge and then expanded in a taper shape.

Although the shape of the formed body formed by the twin screw extruder of the present invention is not particularly limited a long as it is a shape obtained by extrusion molding, the twin- screw extruder is preferable to form, for example, a honeycomb formed body which is liable to be deformed because it employ thin partitions to partition cells.

by: ericfu

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