B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 33/10 (2006.01) B29C 44/34 (2006.01) B29C 67/22 (1990.01)
Patent
CA 2133392
A device for molding foam products comprising upper and lower portions cooperable to form a foam mold defining a mold cavity therein. The upper mold portion has at least one vent hole therein. A mechanism for providing the mold cavity with an expandable foam during a filling cycle is also provided. The expandable foam reactively expands when provided within the cavity so as to be molded into the shape of the cavity during a foaming cycle. The foam approaches the vent hole while expanding within the mold cavity during the foaming cycle. At least one vent hole provides a passage through which air and reaction product gases introduced into the cavity as a byproduct of the reactive expanding of the foam can escape to atmosphere from the cavity during the foaming cycle. A sensing and signal generating assembly detects the presence of the foam at a predetermined proximity to the at least one vent hole during the foaming cycle and generates a signal in response to the detection. Finally, a sealing mechanism cooperates with the at least one vent hole to close the passage when the sensing and signal generating assembly generates the signal in response to the detection of the foam at the predetermined proximity to the at least one vent hole to prevent the foam approaching the vent hole from escaping the cavity through the passage.
Atoma International Inc.
Imai Jeffrey T.
LandOfFree
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