초록 ▼

A perforated plate construction for the underwater granulating of plastic strands comprising a base member with a melt distribution channel and a plurality of inlet channels connected to the melt distribution channel and to extruder nozzles of a cutting plate. The base plate is heated in the region

A perforated plate construction for the underwater granulating of plastic strands comprising a base member with a melt distribution channel and a plurality of inlet channels connected to the melt distribution channel and to extruder nozzles of a cutting plate. The base plate is heated in the region of the inlet channels. Between the base member and the cutting plate is an insulating layer through which the extruder nozzles extend. In order to permit compensation for thermal expansion in the cutting plate without damage to the cutting plate and the insulating layer, the latter is formed as an air gap which is substantially coextensive with the cutting plate in the transverse direction of the extruder nozzles. The cutting plate is supported on the base plate by a plurality of tubular support elements which are separate from each other and freely extended through the air gap.

대표청구항 ▼

In a perforated plate construction for underwater granulating of plastic strands comprising a base member having a melt distributor channel for molten plastic material and a plurality of inlet channels connected to said distributor channel, a cutting plate having outlets for discharge of the plastic

In a perforated plate construction for underwater granulating of plastic strands comprising a base member having a melt distributor channel for molten plastic material and a plurality of inlet channels connected to said distributor channel, a cutting plate having outlets for discharge of the plastic material as strands therefrom, extruder nozzles connecting said inlet channels and said outlets for discharge of the plastic material as strands therefrom, extruder nozzles connecting said inlet channels and said outlets, said extruder nozzles including conically tapered portions, heating means in said base member in the region of the inlet channels, and an insulating means between said base member and said cutting plate and through which said extruder nozzles pass, the improvement wherein said insulating means is constructed as an insulating air gap which adjoins the cutting plate and extends substantially entirely thereacross and a plurality of separate support members extend through said gap and support said cutting plate on said base plate in spaced relation therewith so as to form said air gap between the base plate and cutting plate to be of substantially constant, uniform depth such that said cutting plate can undergo free thermal deflection relative to said base plate, each of said support members comprising a tubular insert member having a conical portion communicating with a respective inlet channel, said tubular insert member being fitted in said base member and in said cutting plate.