Method and high-pressure mixing apparatus with self-regenerating seal

摘要

A method for forming a self-regenerating seal in a mixing chamber of a high-pressure mixing apparatus for polymeric components suitable for providing a reactive mixture for a polymerizable resin. An annular sealing element is provided in a circular housing seat inside the mixing chamber, in a sealing zone downstream the injection holes for the polymeric components; worn and/or torn parts of the annular sealing element are automatically regenerated by the same reactive mixture delivered during operation of the mixing apparatus. A high-pressure mixing apparatus with self-regenerating sealing element is also claimed.

主权项

1. A method for forming a self-regenerating seal into a mixing chamber of a high pressure mixing apparatus, comprising the steps of:
feeding a first and at least a second polymeric component to the mixing chamber through injection holes, to form a reactive polymeric mixture, to be dispensed by a delivery conduit, in which a slidable valve member is reciprocable in the mixing chamber between a retracted position, and an advance position to open and respectively close the injection holes and the mixing chamber in respect to the delivery conduit; providing at least one annular seat for housing an annular sealing element on an inner surface of the mixing chamber in a sealing zone downstream of the injection holes; providing an annular sealing element in said at least one annular housing seat by a polymerisable resin; and automatically regenerating worn and/or torn parts of the annular sealing element, by allowing the reactive mixture to fill up and polymerize into the worn and/or torn parts of the sealing element, inside the annular housing seat.