An extrusion die has a plurality of die layers stacked one upon the other in a direction generally parallel to the central axis. Each of the layers has an annular flow distribution ring having an outer generally cylindrical surface and an annular feed ring surrounding and engaging the outer surface of the distribution ring. At the engaged surfaces of the feed and distribution ring, the flow from the feed ring is divided into a number of substantially equal flow portions. Seals between adjacent engaged surfaces confine the flow to between the circumferential surfaces of the feed and distribution ring. Half of the flow portions are directed to a recombination region on one side of the distribution ring, and half are directed to a recombination region on the other side of the ring. In recombining, weld lines are formed in high flow areas to minimize the deleterious effect of polymer degradation. Subsequently, the flows on opposite sides of the distribution ring are recombined such that the weld lines from one half are first modified to exhibit lower flow and then are layered with non-weld line portions modified to exhibit higher flow from the other half.
An internal bubble cooling air control system in a blown film apparatus has sensors arranged to increase response time and reduce interference, and includes a high speed valve for fast actuation of air flow from a controller in response to signals received from the sensors.
William Randolph - Farmington NY Robert E. Cree - Newark NY
Assignee:
Addex, Inc. - Stoughton MA
International Classification:
B29C 4720
US Classification:
425 721, 425141, 4253261, 4253871
Abstract:
A plastic resin extrusion line for the production of blown film includes an external thickness control device that provides a controllable amount of air from an inlet side through an annular region to one or two sets of lips. Barriers that can be manually or automatically controlled are provided in the annular region for localized control of air flow and thus for localized thickness control. The pressure drop across the barriers is significant relative to that in the lips.
An internal bubble cooling air control system in a blown film apparatus has sensors arranged to increase response time and reduce interference, and includes a high speed valve for fast actuation of air flow from a controller in response to signals received from the sensors.
Method And Apparatus For Regular Division Of Molten Extrusion Flow
A blown film die divides a flow of material into two flows with higher and lower flow portions and recombines the flow by combining higher flow portions with lower flow portions. The flow can be divided in circumferential channels between an annular feed ring and an annular distribution ring.
Method And Apparatus For Regular Division Of Molten Extrusion Flow
A blown film die divides a flow of material into two flows with higher and lower flow portions and recombines the flow by combining higher flow portions with lower flow portions. The flow can be divided in circumferential channels between an annular feed ring and an annular distribution ring.
William Randolph - Farmington NY, US Robert E. Cree - Newark NY, US
Assignee:
Addex, Inc. - Newark NY
International Classification:
B29C 39/14
US Classification:
264566, 264569
Abstract:
A plastic resin extrusion line for the production of blown film includes an external thickness control device that provides a controllable amount of air from an inlet side through an annular region to one or two sets of lips. Barriers that can be manually or automatically controlled are provided in the annular region for localized control of air flow and thus for localized thickness control. The pressure drop across the barriers is significant relative to that in the lips.
An electrostatic charging system holds a film web to a roll without significant slippage, thus allowing for proper tension control of the web even with extreme differences in tension upstream and downstream of the motorized roll. The system can electrostatically transfer a web using motorized drum rolls with an internally integrated web severing knife.
Name / Title
Company / Classification
Phones & Addresses
Robert E Cree
ADDEX DESIGN, INC
251 Murray St, Newark, NY 14513
Robert E Cree
ADDEX, INC Oem for Blown Film Plastics Industry
C/O Robert E Cree 251 Murray St, Newark, NY 14513 251 Murray St, East Palmyra, NY 14513 251 Murray St, Newark, NY 14513 3153317700
Bob Cree (1946-1950), freida thompson (1978-1982), Peggy Jordan (1956-1960), joshua beach (2000-2004), Arthur Bell (1971-1975), Martha Rowe (1968-1972)