Importance

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Abstract

The manufacture of a plastic material, particularly provided with fibers, is frequently carried out in an extruder (10). Various problems have arisen in this connection. For example, problems arise in working long or endless reinforcement fibers, for example rovings (27), into the plastic. On the one hand, the fibers are so badly broken up that they have only very small lengths. On the other hand, it has proved difficult to impregnate the fibers sufficiently. According to the invention, in order to feed in fibers, the plastic is moved in batches past a pre-plastifying worm (11). This is achieved by a secondary worm (18) located next to the pre-plastifying worm (11). The secondary worm (18) enables the plastic to be provided in a controlled manner with fibers outside the pre-plastifying worm (11), and enables the secondary worm (18) to be designed in such a way that it satisfies the conditions for a good combination and mixture of the plastic with the additives, and particularly a good impregnation of the fibers.

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First Claim