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US 11,192,279 B2Granted
Plasticating apparatus screw having grooves of varying angles and depths
AssigneeDavis-Standard, LLC
InventorJohn P. Christiano
Life of this patent
Estimating the term…
Abstract
A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.
Claims12
A screw for a plasticating apparatus, the screw comprising:
- a longitudinal axis, the screw being rotatably supportable in a barrel for rotation about the longitudinal axis, the screw having a core and at least one helical flight extending along a length of the screw, the helical flight defining a helix angle relative to the longitudinal axis and defining a first helical path of a first helix angle less than ninety degrees;
- the helical flight defining a helical channel;
- and
- a longitudinal portion of the screw having a plurality of advancing grooves with each advancing groove having at least one closed-end, the plurality of advancing grooves being arranged in a noncontinuous helix cut in the screw core in the helical channel of the screw, the plurality of advancing grooves being dimensioned to receive material therein as the material is conveyed through the helical channel;
- the longitudinal portion further having a plurality of noncontinuous cross-cut grooves traversing several of the plurality of advancing grooves;
- and
- at least one of:
- at least one of the plurality of advancing grooves having an advancing groove depth taper;
- and
- at least one of the plurality of cross-cut grooves having a cross-cut groove depth taper.
7 more elements
A screw for a plasticating apparatus, the screw comprising:
- a longitudinal axis, the screw being rotatably supportable in a barrel for rotation about the longitudinal axis, the screw having a core and at least one helical flight extending along a length of the screw, the helical flight defining a helix angle relative to the longitudinal axis and defining a first helical path of a first helix angle less than ninety degrees;
- the helical flight defining a helical channel;
- and
- a longitudinal portion of the screw having a plurality of advancing grooves with each having at least one closed-end, the plurality of advancing grooves being arranged in a noncontinuous helix cut in the screw core in the helical channel of the screw, the plurality of advancing grooves being dimensioned to receive material therein as the material is conveyed through the helical channel;
- the longitudinal portion further having a plurality of noncontinuous cross-cut grooves traversing at least one advancing groove;
- the plurality of cross-cut grooves comprising:
- at least one first cross cut groove having a second helix angle;
- at least one second cross-cut groove having a third helix angle;
- and
- wherein the first helix angle, the second helix angle, and the third helix angle are different.
7 more elements
A screw for a plasticating apparatus, the screw comprising:
- a longitudinal axis, the screw being rotatably supportable in a barrel for rotation about the longitudinal axis, the screw having a core and at least one helical flight extending along a length of the screw, the helical flight having a radially outermost flight surface, the helical flight defining a helix angle relative to the longitudinal axis and defining a first helical path of a first helix angle less than ninety degrees;
- the helical flight defining a helical channel;
- and
- a longitudinal portion of the screw having a plurality of advancing grooves with each advancing groove having at least one closed-end, the advancing grooves being arranged in a noncontinuous helix cut in the screw core in the helical channel of the screw, the plurality of advancing grooves being dimensioned to receive material therein as the material is conveyed through the helical channel;
- the longitudinal portion further having at least one undercut surface located radially inwardly from the radially outermost flight surface and wherein the undercut surface has a depth that varies at least one of:
- in a longitudinal direction parallel to the plurality of advancing grooves;
- and
- in a direction traverse to the longitudinal direction.
5 more elements
Dependencies are inferred from the claim text.