Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Measuring – testing – or inspecting
Patent
1994-09-30
1996-08-06
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Measuring, testing, or inspecting
264408, 264409, 264 404, 264101, 2643284, 26432815, 425145, 425174, B29C 4576, B29C 4502
Patent
active
055431054
ABSTRACT:
A method and apparatus for injection molding. The injection molding machine includes a mold formed by a fixed mold half and a movable mold half cooperating with the fixed mold half for defining a mold cavity of the mold and a gate channel leading to the mold cavity. An injection piston is operatively associated with the mold cavity for pressing a melt via the gate channel into the mold cavity. A sensor device detects a melt front of the melt rising upstream of the mold cavity in a conveying direction of the melt at a predetermined detection height. The sensor device includes walls defining a measurement gap disposed at the detection height and extending transversely to the conveying direction of the melt. The measurement gap is at least partially penetrated by a fraction of the melt from the melt front when the melt front rises toward the mold cavity. A measuring device operatively associated with the measurement gap is responsive to a presence of the fraction of the melt in the measurement gap without directly contacting the melt and generates a measurement signal for controlling predetermined parameters of the machine.
REFERENCES:
patent: 4850420 (1989-07-01), Koya
patent: 4986338 (1991-01-01), Yamauchi et al.
patent: 5103893 (1992-04-01), Naganuma et al.
patent: 5361826 (1994-11-01), Yamauchi et al.
patent: 5363899 (1994-11-01), Takagi et al.
patent: 5375646 (1994-12-01), Stummer et al.
Frey Rolf
Stummer Friedrich
Heitbrink Jill L.
Maschinenfabrik Mueller-Weingarten AG
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