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OwnerMichael A. Freek, Ottavio Di Minno +3inventors
InventorsMichael A. Freek, Ottavio Di Minno, Dan Weissman, Erland R. Sandstrom, David H. Hollenberg
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A method of making a disposable tumbler includes: injection molding a polyethylene terephthalate resin in an annular mold cavity defined by an injection mold wall and a core to form a resinous parison on the core; separating the parison from the injection mold wall by moving the parison on the core away from the mold wall; moving the parison on the core into alignment with a blow-mold; and expanding the parison by directing a pressurized fluid to its interior such that the parison separates from the core and expands to the surface of the blow mold to form the tumbler, wherein the parison is radially expanded by a factor of at least about 2.6 at its base to form the tumbler. Typically, the parison is radially expanded at its base by a factor of from about 2.6 to about 3.25 to form the tumbler; whereas preferably the parison is expanded by a factor of from about 2.7 to about 2.9. In preferred embodiments of the method, the mold core is provided with a microtextured surface which may be provided by way of vapor-honing to provide a tumbler which resists nest-lock. Moisture, judiciously applied, may likewise alleviate nest-lock. The annular mold cavity is generally thicker than similar cavities which may be employed with polystyrene, for example.
A method of making a disposable tumbler comprising:
A method of making a disposable tumbler comprising:
An injection blow-molded polyethylene terephthalate tumbler formed by way of injection molding a parison about a core and expanding the parison by way of directing a pressurized fluid to its interior such that the parison separates from the core and expands to the surface of a blow mold to form the tumbler, wherein the parison is radially expanded by a factor of at least about 2.6 at its base when forming the tumbler.
A method of producing a stack of polyethylene terephthalate tumblers with a reduced tendency to exhibit nest-lock comprising the sequential steps of:
A method of producing a stack of polyethylene terephthalate tumblers with a reduced tendency to exhibit nest-lock comprising:
A nesting-lock resistant polyethylene terephthalate disposable tumbler having a wall thickness of from about 5 to about 30 mils, said tumbler being provided with a microtextured surface and being substantially optically clear, wherein said microtextured surface is operative to reduce the tendency of said tumbler to lockably nest with like tumblers when stacked but does not substantially alter the aesthetics of said optically clear tumbler.
Dependencies are inferred from the claim text.