초록 ▼

A vacuum sizing apparatus and method of cooling and sizing plastic extrusions. In one embodiment the molten plastic extrudate enters a first vacuum chamber, passes into an ambient air environment, and then passes into a second water chamber. The first vacuum chamber includes entry and exit sizing pl

A vacuum sizing apparatus and method of cooling and sizing plastic extrusions. In one embodiment the molten plastic extrudate enters a first vacuum chamber, passes into an ambient air environment, and then passes into a second water chamber. The first vacuum chamber includes entry and exit sizing plate manifolds to impart and maintain the size and shape of the plastic extrudate.

대표청구항 ▼

An apparatus for cooling and sizing molten plastic extrudate after it exits an extrusion die, comprising: a first water chamber containing water under vacuum pressure, wherein said first water chamber is disposed to receive the extrudate after said extrudate exits said extrusion die and where said f

An apparatus for cooling and sizing molten plastic extrudate after it exits an extrusion die, comprising: a first water chamber containing water under vacuum pressure, wherein said first water chamber is disposed to receive the extrudate after said extrudate exits said extrusion die and where said first water chamber is no more than twelve inches in length; an entry passage for the molten plastic extrudate into said first water chamber wherein said entry passage to said first water chamber comprises an entry sizing plate manifold having a thickness of no more than two inches, and wherein said entry sizing plate manifold is subject to a vacuum pressure; an exit passage from said first water chamber for the plastic extrudate for passage of the extrudate into an ambient air environment as the extrudate exits said first water chamber, wherein said exit passage comprises an exit sizing plate manifold having a thickness of no more than two inches, wherein said exit sizing plate manifold is subjected to a vacuum pressure; and wherein there are no sizing or calibration plates positioned between said entry and exit sizing plate manifolds. A method of cooling and sizing molten plastic extrudate after said extrudate exits an extrusion die, comprising the steps of: passing said molten plastic extrudate into a first water chamber containing water under vacuum pressure; said first water chamber disposed to receive the extrudate after said extrudate exits said extrusion die and said first water chamber having a length of no more than twelve inches; said first water chamber further including an entry passage for the extrudate into said first water chamber and an exit passage for the extrudate out of said first water chamber, where said entry and exit passages of said first water chamber each comprise a sizing plate manifold subject to vacuum pressure, and where each of said entry and exit sizing plate manifolds have a thickness of no more than two inches; and wherein there are no sizing or calibration plates positioned between said entry and exit sizing plate manifolds; passing said extrudate out of said first water chamber into an ambient air environment; passing said extrudate from said ambient air environment into a second water chamber having an entry passage for said extrudate.