Vacuum pressure forming apparatus and vacuum pressure forming me

Details Vacuum pressure forming apparatus and vacuum pressure forming me Vacuum pressure forming apparatus and vacuum pressure forming me

1997-04-11

2000-01-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Female mold type means

425125, 425364R, 425384, 4253871, 425818, B29C 4322, B29C 4344, B29C 4352

Patent

active

06010323&

ABSTRACT:
A vacuum pressure forming apparatus which is capable of uniformly heating a sheet member and preventing the occurrence of wrinkles or rain drops in the sheet member. The apparatus is equipped with an endless belt having a number of air holes and is stretched between a heating drum and a cooling drum. After preheating, the sheet member is placed closely into contact with a surface of the endless belt through the use of a pressing roller and the sheet member is clamped between the endless belt and a metal pattern having a plurality of cavities formed therein. The apparatus further includes a pressure difference producing device which supplies pressurized air from a rear surface side of the endless belt toward the sheet member such that pressure on an upper surface of the sheet member becomes higher than pressure on a lower surface thereof. Consequently, the sheet member is formed into configurations corresponding to the configurations of the cavities of the metal pattern.

REFERENCES:
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patent: 3593492 (1971-07-01), Frankefort
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patent: 4666394 (1987-05-01), Wakamiya et al.
patent: 4740342 (1988-04-01), Menard et al.
patent: 5314325 (1994-05-01), Bosler
patent: 5636501 (1997-06-01), Long et al.

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