초록

A feedblock for coextrusion apparatus permits profile adjustment of individual layers through the use of flow tuning valves that extend across the width of a main flow through the feedblock.

대표청구항 ▼

[ I claim:] [1.] A feedblock, comprising:a main passage having a length extending from a first inlet toward an outlet and a width transverse to the length;a plurality of intercommunicating auxiliary passages converging with the main passage on one side of the main passage at a series of openings arr

[ I claim:] [1.] A feedblock, comprising:a main passage having a length extending from a first inlet toward an outlet and a width transverse to the length;a plurality of intercommunicating auxiliary passages converging with the main passage on one side of the main passage at a series of openings arranged across the width of the main passage, the auxiliary passages intercommunicating over at least a portion of their lengths from the openings to upstream of the openings; andflow adjustment apparatus disposed in the auxiliary passages for controlling flow of a material therethrough;wherein each auxiliary passage is defined by associated passage walls substantially fully surrounding an associated auxiliary flow of material therethrough.