Apparatus and method for injecting or extruding colored plastic
AssigneeBemis Manufacturing Company
InventorsPeter F. Bemis, Loren C. Albrecht, Steven F. Schick
Life of this patent
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Abstract
Apparatus including a barrel including a generally cylindrical inner wall defining a generally cylindrical chamber having a longitudinal axis, an inlet end for receiving solid material, and an outlet end for discharging molten material, the inner wall having therein a recess extending longitudinally of the chamber, a screw which extends along the longitudinal axis and which is rotatably housed in the chamber, a drive mechanism for rotating the screw about the axis, and a conduit for introducing colorant into the chamber, the conduit having a downstream end communicating directly with the recess so that colorant flowing through the conduit flows directly into the recess.
Claims42
Apparatus comprising
- a barrel including a generally cylindrical inner wall defining a generally cylindrical chamber having a longitudinal axis, an inlet end for receiving solid material, and an outlet end for discharging molten material, said inner wall having therein a recess extending longitudinally of said chamber,
- a screw which extends along said longitudinal axis and which is rotatably housed in said chamber,
- a drive mechanism for rotating said screw about said axis, and
- a conduit for introducing a liquid additive into said chamber, said conduit having a downstream end communicating directly with said recess so that additive flowing from said conduit flows directly into said recess prior to flowing from said recess into said chamber.
Apparatus for extruding colored molten material, said apparatus comprising
- a heated barrel including a generally cylindrical inner wall defining a generally cylindrical chamber having a longitudinal axis, an inlet end adapted to receive uncolored solid material, and an outlet end adapted to discharge colored molten material, said inner wall having therein a recess extending longitudinally of said chamber,
- a screw which extends along said longitudinal axis and which is rotatably housed in said chamber,
- a drive mechanism for rotating said screw about said axis,
- a low-pressure pump having an inlet adapted to communicate with a source of colorant and having an outlet, and
- a conduit having an upstream end communicating with said pump outlet and having a downstream end communicating directly with said recess so that colorant flowing from said conduit flows directly into said recess prior to flowing from said recess into said chamber.
Apparatus for injection molding colored molten material, said apparatus comprising
- a heated barrel including a generally cylindrical inner wall defining a generally cylindrical chamber having a longitudinal axis, an inlet end adapted to receive uncolored solid material, and an outlet end adapted to discharge colored molten material, said inner wall having therein a recess extending longitudinally of said chamber,
- a screw which extends along said longitudinal axis and which is rotatably housed in said chamber,
- a drive mechanism for rotating said screw about said axis and for reciprocating said screw along said axis,
- a low-pressure pump having an inlet adapted to communicate with a source of colorant and having an outlet, and
- a conduit having an upstream end communicating with said pump outlet and having a downstream end communicating directly with said recess so that colorant flowing from said conduit flows directly into said recess prior to flowing from said recess into said chamber.
Apparatus comprising
- a barrel including a generally cylindrical inner wall defining a generally cylindrical chamber having a longitudinal axis, an inlet end, an outlet end, a low-pressure section adjacent said inlet end, and a high-pressure section downstream of said low-pressure section, said inner wall having therein a recess extending longitudinally of said chamber, said recess having an upstream end in said low-pressure section and a downstream end in said high-pressure section,
- a screw which extends along said longitudinal axis and which is rotatably housed in said chamber,
- a drive mechanism for rotating said screw about said axis,
- means for introducing solid material to said inlet end of said chamber so that said screw moves the material through said chamber and toward said outlet end, and
- means for introducing a liquid additive into said recess in said low-pressure section of said chamber so that additive flowing from said conduit flows directly into said recess prior to flowing from said recess into said chamber and so that the additive moves toward said downstream end and remains substantially in said recess until reaching said downstream end.
A method for adding liquid additive to material in an apparatus including a heated barrel with a generally cylindrical inner wall defining a generally cylindrical chamber, the chamber having a longitudinal axis, an inlet end adapted to receive uncolored solid material, and an outlet end adapted to discharge colored molten material, a screw which extends along the longitudinal axis and which is rotatably housed in the chamber, and a drive mechanism for rotating the screw about the axis, said method comprising the steps of
- providing in the inner wall of the barrel with a recess extending longitudinally of the chamber, and
- injecting liquid additive directly into said recess so that the additive flows directly into said recess prior to flowing into said chamber.
Dependencies are inferred from the claim text.