US 9,808,971 B2
Nozzle shut off for injection molding system
Richard Ernest Fitzpatrick, Loveland, CO (US)
Assigned to EXTRUDE TO FILL, LLC, Loveland, CO (US)
Filed by Extrude To Fill, LLC, Maple Park, IL (US)
Filed on Dec. 4, 2015, as Appl. No. 14/960,115.
Claims priority of provisional application 62/087,414, filed on Dec. 4, 2014.
Claims priority of provisional application 62/087,449, filed on Dec. 4, 2014.
Claims priority of provisional application 62/087,480, filed on Dec. 4, 2014.
Prior Publication US 2016/0158981 A1, Jun. 9, 2016
Int. Cl. B29C 45/73 (2006.01); B29C 45/23 (2006.01); B29C 45/13 (2006.01); B29C 45/03 (2006.01); B29C 45/18 (2006.01); B29C 45/40 (2006.01); B29C 45/74 (2006.01); B29C 45/76 (2006.01); G05B 19/042 (2006.01); H02K 7/14 (2006.01); B29C 45/47 (2006.01); B29C 45/60 (2006.01); B29C 45/77 (2006.01); B29C 45/78 (2006.01); B29C 45/50 (2006.01); B29C 45/17 (2006.01); B29K 105/26 (2006.01)
CPC B29C 45/13 (2013.01) [B29C 45/03 (2013.01); B29C 45/18 (2013.01); B29C 45/23 (2013.01); B29C 45/40 (2013.01); B29C 45/47 (2013.01); B29C 45/60 (2013.01); B29C 45/73 (2013.01); B29C 45/74 (2013.01); B29C 45/76 (2013.01); B29C 45/77 (2013.01); B29C 45/78 (2013.01); G05B 19/042 (2013.01); H02K 7/14 (2013.01); B29C 45/5092 (2013.01); B29C 2045/1792 (2013.01); B29C 2045/1875 (2013.01); B29C 2945/76006 (2013.01); B29C 2945/76257 (2013.01); B29C 2945/76381 (2013.01); B29C 2945/76498 (2013.01); B29C 2945/76665 (2013.01); B29C 2945/76859 (2013.01); B29K 2005/00 (2013.01); B29K 2105/26 (2013.01); B29K 2995/0008 (2013.01); G05B 2219/2624 (2013.01)] 34 Claims
OG exemplary drawing
 
1. A method of fabricating a molded part, the method comprising:
clamping a mold;
opening a nozzle by separating a tip of an extrusion screw from an opening formed in the nozzle;
rotating the extrusion screw to pump a molten material into the mold until the mold is filled;
closing the nozzle by positioning the tip of the extrusion screw in sealed engagement with the nozzle; and
unclamping the mold to release the molded part;
wherein:
opening the nozzle comprises rotating the extrusion screw to move the screw tip away from the nozzle; and
closing the nozzle comprises reversing rotation of the extrusion screw to move the screw tip into contact with the nozzle.