초록 ▼

The method of improving the stiffness of a polystyrene foam cup having a generally closed cell foam sidewall and bottom and a solid plastic film coating on at least the outer surface thereof comprising placing said cup around a heated mandrel, said mandrel having an outside diameter sufficiently les

The method of improving the stiffness of a polystyrene foam cup having a generally closed cell foam sidewall and bottom and a solid plastic film coating on at least the outer surface thereof comprising placing said cup around a heated mandrel, said mandrel having an outside diameter sufficiently less than an inside diameter of said cup to allow the cup sidewall to expand, at a temperature and for a time sufficient to expand the sidewall.

대표청구항 ▼

A method of providing a foam cup having a sidewall and a bottom, said cup having an improved sidewall deflection strength and being suitable for use with hot beverages, comprising: (a) forming the foam cup from a roll stock of a polystyrene foam by rolling said roll stock into shape to form the side

A method of providing a foam cup having a sidewall and a bottom, said cup having an improved sidewall deflection strength and being suitable for use with hot beverages, comprising: (a) forming the foam cup from a roll stock of a polystyrene foam by rolling said roll stock into shape to form the sidewall, subsequently forming the bottom of the cup from said roll stock and sealing the bottom to the sidewall of the foam cup, (b) placing said cup around a heated mandrel, said mandrel having an outside diameter sufficiently less than than the inside diameter of the cup so that the sidewall of the cup is not in contact with the mandrel, and (c) maintaining the cup around said mandrel at a temperature and for a time sufficient to expand the sidewall of the cup to increase the sidewall deflection strength of the cup.