Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-10-01
1994-10-18
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 405, 264 406, 2643281, 425135, 425144, 425145, 425149, 425155, 425159, B29C 4576
Patent
active
053565754
ABSTRACT:
In a machine for injection molding thermoplastic materials in a molding tool by seriatim injection cycles, wherein an injection pressure stage and a subsequent holding pressure stage are employed, and wherein parameters of a change-over point from the injection pressure to the holding pressure have a trend of varying, a method for regulating the trend of the change-over point in each injection cycle, involving (a) establishing upper and lower pressure, and time boundary target parameters for a working window, (b) establishing upper and lower temperature boundary target parameters for a working band, (c) defining the change-over point within said working window, by specifying a pressure, at a given time, (d)measuring the actual pressure at the time of changing from the injection pressure to the holding pressure, and detecting any pressure and time differences from the boundary target parameters of the working window, (e) measuring the actual temperature, and detecting any temperature differences from the boundary target parameters for the working band, (f) shifting the change-over point in proportion to the detected differences, subject to the conditions that the (i) changing of the time is in the same direction as any detected difference, (ii) changing of the pressure is in the opposite direction from any detected difference, and (iii) changing of the temperature in the same direction as the detected difference, and of the pressure is in the opposite direction of the detected difference.
REFERENCES:
patent: 3750134 (1973-07-01), Weisend
patent: 3932083 (1976-01-01), Boettner
patent: 4311446 (1982-01-01), Hold et al.
patent: 4828473 (1989-05-01), Otake et al.
patent: 5173223 (1992-12-01), Kamiguchi et al.
Krosse Dietmar
Reichstein Ulrich
Schreiner Helmut
Heitbrink Jill L.
Mannesmann Aktiengesellschaft
LandOfFree
Method for controlling the trend of the change-over point 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 the trend of the change-over point, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling the trend of the change-over point will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2370299