Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1979-06-14
1981-09-22
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 406, 264176R, B29C 302
Patent
active
042909864
ABSTRACT:
A control system for a plastic extruder which automatically controls both the melt pressure and the melt temperature of the plastic material at the outlet of the extruder barrel. The extruder barrel is divided into a plurality of heating zones and a zone temperature control means individually controls the temperature of each zone in accordance with predetermined zone temperature set points. A melt temperature control means automatically adjusts certain zone temperature set points such that the actual melt temperature is maintained at its desired value. The speed of a rotatable extruder screw is controlled by a melt pressure control means such that the actual melt pressure is maintained at its desired value. In accordance with the present invention, a separate feedforward controller and separate feedback controller are provided in the melt temperature control loop and in each zone temperature control loop such that independent specification of set point and disturbance responses can be achieved. Also, the melt temperature control means and the melt pressure control means are each provided with an interaction controller such that the interactions between melt temperature and melt pressure are minimized.
REFERENCES:
patent: 3698844 (1972-10-01), Grimm
patent: 3728058 (1973-04-01), Wheeler
patent: 3733059 (1973-05-01), Pettit
patent: 3822867 (1974-07-01), Evans
patent: 3924840 (1975-12-01), Nelson
patent: 4088430 (1978-05-01), Giles
patent: 4102958 (1978-07-01), Wertz
patent: 4120630 (1978-10-01), LaSpisa et al.
patent: 4168290 (1979-09-01), Giles
Technical Data Sheet, TDS-247, Harrel, Inc.
G. Menges, et al., "Kunststoff-Rundschau" entitled Problems In Plastics Extruders and Proposals for New Regulating Systems, vol. 16, No. 7, pp. 391-399, Jul. 1969.
Click Myron E.
Heberling Richard D.
Owens--Illinois, Inc.
Wilson David H.
Woo Jay H.
LandOfFree
Method for controlling a plastic extruder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for controlling a plastic extruder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling a plastic extruder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-334930