JPWO2020174394A5 - - Google Patents

Claims (11)

A dispensing head for filament adhesive, comprising:
a barrel containing one or more heating elements;
An inlet extending through the side of the barrel for receiving the filament adhesive, the angled nip point preventing the filament adhesive from breaking as it is drawn into the barrel. an inlet, and
a spout at the distal end of the barrel for dispensing the filament adhesive in molten form;
a rotatable screw received within said barrel, said rotatable screw optionally including at least one mixing element. 2. The dispensing head of claim 1, wherein the tilt nip point is partially defined by a forward sidewall surface of the inlet that extends at an acute angle to the longitudinal axis of the rotatable screw. Dispensing head according to claim 2, wherein the acute angle is between 13 degrees and 53 degrees. A dispensing head according to any preceding claim, wherein the inlet extends along a nominal screw length of the rotatable screw between 10% and 40%. A dispensing head according to any preceding claim, wherein the at least one mixing element comprises a plurality of posts arranged on a rotatable shaft. Dispensing head according to any one of the preceding claims, wherein the rotatable screw further comprises a feed element adjacent the inlet, the feed element comprising a plurality of gripping lugs. Dispensing head according to any one of the preceding claims, wherein the rotatable screw has a length:diameter ratio between 8:1 and 20:1. A dispensing head according to any preceding claim, further comprising a drive mechanism operably connected to the rotatable screw. A dispensing system comprising the dispensing head according to any one of claims 1 to 8 and the filament adhesive. 10. The dispensing system of Claim 9 , wherein the filament adhesive comprises a core-sheath adhesive. A method of dispensing filament adhesive from a dispensing head comprising a heated barrel receiving a rotating screw, comprising:
feeding the filament adhesive through an inlet of the heated barrel, the inlet shearing the filament adhesive as it is drawn into the heated barrel; providing a slanted nip point that reduces
melting the filament adhesive within the heated barrel to provide a molten adhesive;
mixing said molten adhesive using at least one mixing element, optionally arranged on said rotating screw;
dispensing the molten adhesive through a spout at the distal end of the heated barrel.