Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1995-06-06
1997-08-19
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
425388, B29C 5110
Patent
active
056585233
ABSTRACT:
A method and apparatus for forming twin sheet hollow plastic articles such as plastic pallets. A pair of plastic sheets is delivered directly from an extruder and loaded directly into a pair of clamping frames. The sheets are then moved in the clamping frames into an oven where the sheets are heated, whereafter the sheets are transferred to a hot forming station where the sheets are formed into a pallet. This pallet is then transferred to a cold forming station where further processing of the pallet takes place, and then to an unloading station where the finished pallet is removed and a new set of plastic sheets from the extruder is loaded into the clamping frames. At the hot forming station the sheets are delivered in side by side relation on the sheet plane with one sheet overlying a female mold and the other sheet underlying a male mold, the sheets are molded respectively and simultaneously to the male and female molds, the female mold is shifted laterally to a position underlying the male mold, and the molds are brought together to fuse selected portions on the sheet carried by the male mold to selected portions on the sheet carried by the female mold to form the twin sheet pallet. The cold forming station includes male and female molds, corresponding generally to the male and female molds of the hot forming station, which reengage the pallet and provide further forming and curing of the pallet as a new pallet is formed at the hot forming station utilizing a new set of plastic sheets.
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