Generation of polyurethane foam

Details Generation of polyurethane foam Generation of polyurethane foam

1977-01-25

1979-06-19

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

141157, 141163, 425817R, B29D 2700

Patent

active

041585356

ABSTRACT:
An improvement in the generation of foam from a mixture of foam-forming material in a structure having a preferred configuration. Conveying means are used to convey the structure along a horizontal path. A plurality of foam gun heads are mounted in spaced relationship to each other over and transverse to said horizontal path. Each foam gun head includes a foam dispensing outlet and valve means for controlling the discharges of the foam-forming materials therefrom. First, sensing means are provided upstream of the foam dispensing outlets for sensing the passage of the structure thereby. A plurality of second sensing means are positioned upstream of the foam dispensing outlets in spaced relationship to each other in a direction transverse to the horizontal path, each one of the second sensing means being associated with one foam gun head for sensing the presence of the structure in a vertical direction. The valve means in a foam gun head is opened in response to the first sensing means sensing the structure and its associated second sensing means also sensing the structure. The valve means of a given foam gun head is closed in response to its associated second sensing means detecting the absence of structure.

REFERENCES:
patent: 3412766 (1968-11-01), Anderson et al.
patent: 3445984 (1969-05-01), Kelly
patent: 3624885 (1971-12-01), Holliday et al.
patent: 3674399 (1972-07-01), Sendor
patent: 3887110 (1975-06-01), Porter
West German Offenlegungsschrift 2125533, 12-1971.

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