Robert Cree

US Patent:

6471502, Oct 29, 2002

Filed:

Jan 12, 2001

Appl. No.:

09/759548

Inventors:

Robert E. Cree - Newark NY

Assignee:

Addex, Inc. - Newark NY

International Classification:

B29C 4706

US Classification:

4251331, 425380, 425461, 425462

Abstract:

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.

US Patent:

6562263, May 13, 2003

Filed:

Dec 21, 2000

Appl. No.:

09/746885

Inventors:

Robert E. Cree - Newark NY

Assignee:

Addex, Inc. - Hingham MA

International Classification:

B29C 4792

US Classification:

264 403, 264564, 264 406, 425141, 4253261

Abstract:

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.

US Patent:

6739855, May 25, 2004

Filed:

Mar 15, 2001

Appl. No.:

09/809698

Inventors:

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.

US Patent:

6802995, Oct 12, 2004

Filed:

Apr 29, 2003

Appl. No.:

10/425418

Inventors:

Robert E. Cree - Newark NY

Assignee:

Addex, Inc. - Hingham MA

International Classification:

B29C 4792

US Classification:

264 403, 264564, 264 406, 425141, 4253261

Abstract:

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.

US Patent:

6926858, Aug 9, 2005

Filed:

Aug 27, 2002

Appl. No.:

10/228451

Inventors:

Robert E. Cree - Newark NY, US

Assignee:

Addex, Inc. - Stoughton MA

International Classification:

B29C047/06
B29C047/20

US Classification:

264514, 26417312, 26417316, 4251331, 425380, 425462

Abstract:

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.

US Patent:

7150848, Dec 19, 2006

Filed:

Jul 28, 2005

Appl. No.:

11/191885

Inventors:

Robert E. Cree - Newark NY, US

Assignee:

Addex, Inc. - Boston MA

International Classification:

B29C 47/06

US Classification:

264514, 26417312, 26417316, 4251331, 425360, 425462, 425461, 4253824

Abstract:

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.

US Patent:

7314592, Jan 1, 2008

Filed:

May 12, 2004

Appl. No.:

10/845307

Inventors:

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.

US Patent:

7341217, Mar 11, 2008

Filed:

Feb 17, 2005

Appl. No.:

11/060074

Inventors:

Robert E. Cree - Newark NY, US

Assignee:

Addex, Inc. - Newark NY

International Classification:

B65H 19/28

US Classification:

242532

Abstract:

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.