PRESSING DEVICE FOR THE REMOVAL OF WATER FROM CELLULOSE OR THE LIKE

• US 3,792,656 A
• Filed: 03/27/1972
• Issued: 02/19/1974
• Est. Priority Date: 04/05/1971
• Status: Expired due to Term

• Current Assignee: Otto Heissenberger
• Original Assignee: Otto Heissenberger
• Inventors: Heissenberger, Otto
• Primary Examiner(s): Feldman, Peter
• Application Number:
  US05/238,450
• Time in Patent Office: 694 Days
• Field of Search: 100/151-154,110,116,118,119,120,121 162/208,210,314,312,358,361,205,351 144/281B
• US Class Current: 100/118
• CPC Class Codes: B30B 9/24 using an endless pressing band
• CPC Class Codes: D21F 1/80 using endless screening belts

Abstract

This invention relates to an improvement in a pressing device for the removal of water from solid materials, particularly cellulose or similar fibrous material, comprising a preliminary pressing station and a main pressing station including pairs of upper and lower horizontal rollers between which a sheet or web of material to be dehydrated is passed, on a sieve or between two sieves. The improvement comprises a lower roller mounted ahead of the paired upper rollers in a staggered manner in the traveling direction of the sieve, in at least one of said preliminary and main pressing stations.

Claims

1. A press for dehydrating materials, particularly cellulose or like fibrous materials, including a preliminary pressing station and a main pressing station in which the material to be dehydrated is passed through a sieve or between two sieves and between at least two pairs of horizontally-disposed rollers defining at least one of said preliminary pressing station and said main pressing station and each consisting of an upper roller and a lower roller, the improvement comprising each successive pair of said pairs of rollers, with respect to the direction of the path of travel of said material to be dehydrated, being disposed at a height greater than the height of the next previous pair of said pairs of rollers in a manner to form a gradually ascending path of travel of said material to be dehydrated which forms an acute angle with a horizontal plane and said lower roller of each of said pairs of rollers being offset from and forward of said upper roller of said pair of rollers, with respect to said direction of travel of said material to be dehydrated, to form an acute angle Alpha between a line through the center of said upper roller and perpendicular to said material to be dehydrated and a line through said center of said upper roller and the center of said lower roller, whereby said material to be dehydrated forms an arcuate loop over the bottom of said upper roller between the side limits of said anglE Alpha .

2. A press in accordance with claim 1 wherein at least one of said pairs of rollers is part of the main pressing station and a line through the center of the upper roller of said pair of rollers in said main pressing station and perpendicular to the material to be dehydrated and a line through said center of said upper roller and the center of the lower roller of said pair of rollers in said main pressing station form an angle Beta which is larger than the angle Alpha of the remaining ones of said pairs of rollers.

3. A press in accordance with claim 2 wherein the angle Beta is between 10* and 45*.

4. A press in accordance with claim 3 wherein the angle Beta is about 30*.

5. A press in accordance with claim 2 wherein the rollers in the main pressing station are larger in diameter than the rollers in the preliminary pressing station.

6. A press in accordance with claim 1 wherein the angle Alpha is between 5* and 30*.

7. A press in accordance with claim 6 wherein the angle Alpha is about 10*.

8. A press in accordance with claim 1 wherein trough means are disposed behind the upper rollers of the pairs of rollers, with respect to the direction of travel of the material to be dehydrated, and the front edges of said trough means are in contact with one of said material to be dehydrated and an upper sieve of the two sieves.

9. A press in accordance with claim 1 wherein all of the pairs of rollers are a part of the preliminary pressing station.