Amorphous polyethylene terephthalate container and process for making it
Abstract
Abstract A CONTAINER PREPARED FROM POLYETHYLENE TEREPHTHALATE HAVING AN INHERENT VISCOSITY OF ABOUT 0.80 TO 1.30 WHEREIN THE CONTAINER IS PRACTICALLY AMORPHOUS, TRANSPARENT, GLOSSY, HAS A SHELL THICKNESS OF ABOUT 30 TO 90 MILS AND A DENSITY OF ABOUT 1.3362 TO 1.3381. THESE CONTAINERS ARE USEFUL IN PACKAGING FOODSTUFFS AND, WHEN IN THE SHAPE OF A BOTTLE, THEY ARE PARTICULARLY USEFUL IN BOTTLING SODAS OR BEER. THE CONTAINERS ARE MADE BY (A) FORCING MELT POLYMER THROUGH AN ANNULAR DIE FORMING A TUBULAR SLUG, (B) ENCOMPASSING THE SLUG WITH A MOLD MAINTAINED AT A TEMPERATURE NO GREATER THAN ABOUT 0*C., (C) EXPANDING THE SLUG UNTIL IT CONFORMS TO THE MOLD THEREBY FORMING THE CONTAINER, (D) QUENCHING THE CONTAINER AGAINST THE MOLD FOR 10 TO 30 SECONDS, (E) REMOVING THE CONTAINER FROM THE MOLD, AND (F) POST-QUENCHING THE CONTAINER FOR AT LEAST 30 SECONDS IN A BATH MAINTAINED AT A TEMPERATURE NO GREATER THAN ABOUT 0*C.
Inventors
- 👤 W Corsover
Bibliographic Details
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