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US 5,269,670 AGranted
Meltblowing die
AssigneeExxon Chemical Patents Inc.
InventorsMartin A. Allen, John T. Fetcko
Life of this patent
Estimating the term…
Abstract
A meltblowing die assembly features (a) intermittent operation, (b) modular valve actuator to selectively shut off polymer flow, (c) an in-line electric heater, and (d) meltblowing units arranged in side-by-side relationship.
Claims6
A meltblowing die comprising
- (a) a die body having a polymer flow passage formed therein;
- (b) a die tip secured to said die body and having a triangular nosepiece defined by converging surfaces terminating in an elongate tip, and a plurality of orifices formed in the tip of the nosepiece and being in fluid communication with said polymer flow passage;
- (c) an air plate mounted on each side of the nosepiece and cooperating with the converging surfaces to define converging air flow slits terminating at or near the tip of the nosepiece;
- (d) said die body having air flow passages formed therein;
- and
- (e) said die tip having a plurality of air passages formed therein having inlets in fluid communication with the air flow passages of said die body and outlets formed in said surfaces of said nosepiece whereby air flows through the die body, through the nosepiece of the die tip and through the slits.
3 more elements
A meltblowing die assembly comprising
- (a) a die body having
- (i) a polymer flow passage formed therein;
- (ii) an air chamber formed therein;
- and
- (iii) a plurality of air passages feeding into said air chamber;
- (b) a die tip having a base portion for mounting on said die body and having
- (i) a nosepiece of triangular cross-section extending outwardly from the base portion and defined by converging surfaces terminating in an outer apex region;
- (ii) a plurality of orifices formed in the apex region;
- (iii) polymer flow passages extending from the base portion to the orifices;
- (iv) a polymer header channel formed in the base portion of the die tip for feeding polymer to each of the orifices through the die tip polymer flow passages, said header channel being in fluid communication with the polymer flow passage of said die body;
- and
- (v) a plurality of air passages formed in the die tip and extending through the base portion and having outlets in a midsection of each of the converging surfaces, said air passages of the die tip being arranged in pairs with half of said outlets being in one of said surfaces and half of said outlets being in the other of said surfaces;
- said air passages of the die tip being in fluid communication with said air chamber;
- and
- (c) air plates mounted on each side of the nosepiece and cooperating with said converging surfaces to define air flow slits, each of said air flow slits being fed by said outlets of said air passages of the die tip.
12 more elements
Dependencies are inferred from the claim text.