Vacuum box with variable stage volume to improve coating uniformity
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United States of America Patent
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Oct 8, 1985
Grant Date -
N/A
app pub date -
Mar 16, 1984
filing date -
Mar 16, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for the application of at least one cast layer (7) on a moving sheet-shaped substrate (4) has a rotating casting roll (1) which guides the substrate. A pouring vessel (8) is arranged adjacent to the casting roll while leaving a casting gap (13). A suction device with a housing (15) has a low pressure chamber (16) extending from the gap (13) to a partition (25) and has a vacuum chamber (17) extending from the partition (25) to an end wall (26). Partition (25) and/or end wall (26) can be adjusted in circumferential direction. The low pressure chamber (16) and the vacuum chamber (17) are connected with each other by means of a bypass (51). In this way, even under varying operating conditions, a high constancy of the pressure in the low pressure chamber (16) can be attained.
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