초록 ▼

The present invention includes a filtration apparatus for an injection molding machine where the injection molding machine includes a screw housed within a bore for generating molten polymer. A tip member extends axially from the screw. The tip member has radially extending upstream and downstream f

The present invention includes a filtration apparatus for an injection molding machine where the injection molding machine includes a screw housed within a bore for generating molten polymer. A tip member extends axially from the screw. The tip member has radially extending upstream and downstream flanges positioned axially apart from each other. A filter encircles the tip member and is capable of filtering the molten polymer. An annular ring member encircles the tip member and is slidably positioned within the bore between the upstream and downstream flanges. The ring member is capable of sliding between the flanges for directing the molten polymer through the filter or preventing back flow of the molten polymer past the upstream flange. An end stop is positioned relative to the bore and is capable of engaging and preventing movement of the ring member past the end stop while allowing the downstream flange of the tip member to be translated forwardly therepast to simultaneously space the upstream and downstream flanges apart from the ring member. This directs the molten polymer past upstream surfaces of the filter for purging contaminants filtered from the molten polymer.

대표청구항 ▼

[ What is claimed is:] [1.] A filtration apparatus for an injection molding machine, the injection molding machine including a screw housed within a bore for generating molten polymer, the filtration apparatus comprising:a tip member extending axially from the screw, the tip member having radially e

[ What is claimed is:] [1.] A filtration apparatus for an injection molding machine, the injection molding machine including a screw housed within a bore for generating molten polymer, the filtration apparatus comprising:a tip member extending axially from the screw, the tip member having radially extending upstream and downstream flanges positioned axially apart from each other;a filter encircling the tip member capable of filtering the molten polymer;an annular ring member encircling the tip member and slidably positioned within the bore between the upstream and downstream flanges, the ring member capable of slidably engaging the downstream flange for directing the molten polymer through the filter as well as slidably engaging the upstream flange for preventing back flow of the molten polymer past the upstream flange; andan end stop positioned relative to the bore capable of engaging and preventing movement of the ring member past the end stop while allowing the downstream flange of the tip member to be translated forwardly therepast to simultaneously space the upstream and downstream flanges apart from the ring member for directing the molten polymer past upstream surfaces of the filter for purging contaminants filtered from the molten polymer. [21.] A method of forming a filtration apparatus for an injection molding machine, the injection molding machine including a screw housed within a bore for generating molten polymer, the method comprising the steps of:axially extending a tip member from the screw, the tip member having radially extending upstream and downstream flanges positioned axially apart from each other;encircling a filter around the tip member capable of filtering the molten polymer;slidably positioning an annular ring member within the bore and encircling the tip member between the upstream and downstream flanges, the ring member capable of slidably engaging the downstream flange for directing the molten polymer through the filter as well as slidably engaging the upstream flange for preventing back flow of the molten polymer past the upstream flange; andpositioning an end stop relative to the bore capable of engaging and preventing movement of the ring member past the end stop while allowing the downstream flange of the tip member to be translated forwardly therepast to simultaneously space the upstream and downstream flanges apart from the ring member for directing the molten polymer past the upstream and downstream flanges as well as past upstream surfaces of the filter for purging contaminants filtered from the molten polymer. [32.] A method of purging contaminants filtered from molten polymer by a filtration apparatus within a bore of an injection molding machine, the filtration apparatus including a tip member including radially extending upstream and downstream flanges positioned axially apart from each other, a filter encircling the tip member for filtering the molten polymer, and an annular ring member slidably positioned within the bore and encircling the tip member between the upstream and downstream flanges, the ring member capable of slidably engaging the downstream flange for directing the molten polymer through the filter as well as slidably engaging the upstream flange for preventing back flow of the molten polymer past the upstream flange, the method comprising the steps of:positioning an end stop relative to the bore to engage and prevent movement of the ring member past the end stop; andtranslating the downstream flange of the tip member past the end stop to simultaneously space the upstream and downstream flanges apart from the ring member for directing the molten polymer past upstream surfaces of the filter for purging the contaminants filtered from the molten polymer.