Headbox apparatus for a papermaking machine
AssigneePaperchine Inc.
InventorJames Ewald
Life of this patent
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Abstract
A headbox apparatus is disclosed for a papermaking machine. The headbox apparatus defines a flow path for stock flowing between an upstream header and a downstream slice lip. The apparatus includes a plurality of elements which are anchored within the flow path between the header and the slice lip. Each element and an adjacent element of the plurality of elements defines therebetween a flow tube for the flow therethrough of the stock. The flow tube has an upstream portion and a downstream portion that gradually widens in a direction from the header to the slice lip.
Claims27
A headbox apparatus for a papermaking machine, said headbox apparatus defining a flow path for stock flowing between an upstream end and a downstream end, said apparatus comprising:
- a plurality of elements which are anchored within the flow path between the upstream end and the downstream end;
- each element and an adjacent element of said plurality of elements defining therebetween a flow tube for the flow therethrough of the stock;
- and
- said flow tube having an upstream portion and a downstream portion that gradually widens in a direction from the upstream end to the downstream end.
A headbox apparatus for a papermaking machine, said headbox apparatus defining a flow path for stock flowing between an upstream header and a downstream slice lip, said apparatus comprising:
- a plurality of elements which are anchored within the flow path between the header and the slice lip;
- each element and an adjacent element of said plurality of elements defining therebetween a flow tube for the flow therethrough of the stock;
- said flow tube having an upstream portion and a downstream portion that gradually widens in a direction from the header to the slice lip;
- and
- said downstream portion has an upstream extremity and a downstream extremity, said upstream extremity of said downstream portion having a cross sectional area which is greater than a cross sectional area of said upstream portion.
A headbox apparatus for a papermaking machine, said headbox apparatus defining a flow path for stock flowing between an upstream header and a downstream slice lip, said apparatus comprising:
- a plurality of elements which are anchored within the flow path between the header and the slice lip;
- each element and an adjacent element of said plurality of elements defining therebetween a flow tube for the flow therethrough of the stock;
- said flow tube having an upstream portion and a downstream portion that gradually widens in a direction from the header to the slice lip;
- each of said elements being fabricated from a plastics material;
- said plastics material being a high molecular weight polyethylene;
- each element defining an upstream and a downstream bore;
- a first anchor rod extending through said upstream bore;
- a second anchor rod extending through said downstream bore such that said anchor rods anchor said element within the headbox apparatus;
- said anchor rods extending substantially normal to said direction from the header to the slice lip;
- each element having a first and a second side, said first side being of mirror image configuration
- relative to said second side;
- each element being disposed in alignment in said direction relative to said adjacent element;
- said flow tube extending in said direction;
- said upstream portion being of rectangular cross sectional configuration;
- said upstream portion having an upstream and a downstream end, said upstream portion being of uniform cross sectional configuration between said upstream and downstream ends thereof;
- said downstream portion having an upstream extremity and a downstream extremity, said upstream extremity of said downstream portion having a cross sectional area which is greater than a cross sectional area of said upstream portion;
- said upstream extremity of said downstream portion having a cross sectional area which is less than a cross sectional area of said downstream extremity;
- said cross sectional area of said downstream portion progressively increasing in said direction between said upstream and said downstream extremities of said downstream portion;
- an intermediate portion of said flow tube, said intermediate portion having a first and a second end, said intermediate portion being disposed between said upstream portion and said downstream portions of said flow tube;
- said downstream end of said upstream porion defining a chamfered transition which is disposed adjacent to said first end of said intermediate portion such that the stock flows through said upstream portion through said chamfered transition and through said intermediate portion and through said downstream portion;
- and
- an edge flow element having an upstream and a downstream termination, said edge flow element being pivotally anchored adjacent to said downstream termination thereof such that selective pivotal movement of said edge flow element is permitted so that a cross sectional area of an edge flow tube defined between said edge flow element and an adjacent element of said plurality of elements is selectively adjustable.
Dependencies are inferred from the claim text.