RICHARD F MITCHELL
Broker in Manchester, MA
License number
Massachusetts 111909
Issued Date
Aug 1, 1979
Expiration Date
Feb 4, 1982
Type
Broker
Address
Address
Manchester, MA 01944
Professional information
Control Of Tubular Film Size
US Patent:
4377540, Mar 22, 1983
Filed:
Aug 24, 1981
Appl. No.:
6/295648
Inventors:
Ronald D. Cluett - Gloucester MA
Richard L. Mitchell - Manchester MA
Richard L. Mitchell - Manchester MA
Assignee:
Gloucester Engineering Co., Inc. - Gloucester MA
International Classification:
B29D 722
US Classification:
264 23
Abstract:
An internally cooled blown film system, for producing a plastic tube, in which the flow rate of the continuous flow of cooling air through the tube is made directly dependent upon deviation of the tube circumference as determined by transmission and detection of ultrasonic waves from the surface of the tube.