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1. WO1996006221 - A PULP SLURRY-HANDLING PRESS ROLL, AND TWIN ROLL AND SINGLE ROLL SLURRY-HANDLING PRESSES

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[ EN ]

What claimed is:

1. A twin roll, slurry-handling press, comprising:
a housing; and
a pair of coacting press rolls journalled in said housing; wherein
said housing has means for admitting pulp slurry to said press rolls; and further including
means for forming a pulp mat on said rolls;
doctor means, for extracting the pulp mat from said rolls; and wherein each of said rolls comprises a drum having a longitudinal axis, and an outer periphery, a multiplicity of longitudinal grooves formed therein about said periphery, means for sealing off each of said grooves from others thereof, and means overlying said grooves for filtering liquid therethrough.

2. A twin roll, slurry-handling press, according to claim 1, wherein:
each of said drums is imperforate.

3. A twin roll, slurry-handling press, according to claim 1, wherein:
said grooves, in each of said rolls, define a herringbone configuration in which each of said grooves comprises a pair of linear troughs which conjoin, contiguously, substantially midway along said axis, and said troughs define an obtuse angle therebetween.

4. A twin roll, slurry-handling press, according to claim 1, wherein;
said filtering means comprises a cylindrical sheath which encloses said drum therewithin; and
said sheath has a multiplicity of minute holes formed therein which open onto said grooves and externally of said sheath.

5. A single roll, slurry-handling press, comprising:
a housing; and
a press roll journalled in said housing; wherein
said housing has means for admitting pulp slurry to said roll, means for forming a pulp mat on said roll, and doctor means, for extracting the pulp mat from said roll;
means for compacting the pulp mat on said roll circumjacent said roll; and
said roll comprises a drum having a longitudinal axis, an outer periphery, a multiplicity of longitudinally extending grooves formed therein about said periphery, and means overlying said grooves for filtering liquid therethrough; said filtering means comprising a cylindrical sheath which encloses said drum therewithin; said sheath comprising means for sealing off each of said grooves from others thereof.

6. A single roll, slurry-handling press, according to claim 5, wherein:
said drum is imperforate.

7. A single roll, slurry-handling press, according to claim 5, wherein:
said compacting means comprises a compaction baffle.

8. A single roll, slurry-handling press, according to claim 5, wherein:
said sheath has a multiplicity of minute holes formed therein which open onto said grooves, and externally of said sheath.

9. A slurry-handling pulp press comprising:
a housing:
a means for admitting pulp slurry into the housing: at least one press roll journaled in the housing and partially submerged in the pulp slurry, the at least one press roll comprising: a drum having a longitudinal axis, an outer periphery, a multiplicity of grooves formed in the drum about the outer periphery; a means overlying the grooves for filtering liquid therethrough into the grooves; and a means for sealing off the grooves from others thereof; and
a means for forming a pulp mat on the at least one roll;
a means for compacting the pulp mat on the at least one roll; and
a doctor means for extracting the pulp mat from the at least one roll.

10. The slurry-handling pulp press according to claim 9, wherein the number of rolls is one and the means for compacting the pulp mat is a compaction baffle.

11. The slurry-handling pulp press according to claim 9, wherein the number of rolls is two, and the means for compacting the pulp mat comprises the rolls being mounted adjacent one another and forming a nip therebetween.