JOHN J MULCAHY
Engineering in Beverly Farms, MA
License number
Massachusetts 28465
Issued Date
Dec 3, 1976
Expiration Date
Jun 30, 2018
Type
Electronic Engineer
Address
Address
Beverly Farms, MA 01915
Professional information
Control Of Tubular Film Size
US Patent:
4243363, Jan 6, 1981
Filed:
Mar 12, 1979
Appl. No.:
6/019486
Inventors:
John J. Mulcahy - Beverly MA
Assignee:
Gloucester Engineering Co., Inc. - Gloucester MA
International Classification:
B29D 2304
US Classification:
425140
Abstract:
A blown-film system, for producing plastic tubing, in which the rate of flow of air, into or out of the tube, is made directly dependent upon the deviation in position of the tube wall and in which stability in tube size is achieved by providing a control system that feeds back both tube circumference and air valve position to drive a valve motor.