# US 4,392,422 A · Apparatus for removing liquid from a suspension

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- Number: US 4,392,422 A
- Document ID: US4392422A
- Status: Granted
- Kind: A
- Application number: 06/275,994
- Filed: 1981-06-22
- Granted: 1983-07-12
- Earliest claimed: 1980-06-25
- Assignees: Axel Johnson Engineering AB
- Inventors: Sven Hakansson
- Web page: https://patentgrep.com/patent/US4392422A

## CPC

- B30B 9/246: {The material being conveyed around a drum between pressing bands}
- B30B 9/243: {The squeezing-out being performed in several stages}
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}

## Abstract

In the embodiments of the web press disclosed in the specification, a pair of webs carries suspension material partly about a series of press drums of decreasing diameter in a first pressing section. One of the webs carrying the suspension material passes to a second press section where a further web replaces the other of the pair of webs to provide the inner web in a path around a press drum. Increased pressure is applied by a pressure belt to the webs as they pass around the press drum in the second pressing section.

## Claims

### Claim 1

Apparatus for removing liquid from a suspension comprising a pair of continuous webs movable over a portion of their length along a common path having an upstream end for introducing the suspension between the webs, a first pressing section including at least a first press drum about a portion of which the pair of webs pass, a second pressing section located downstream from the first pressing section and comprising a second press drum and pressure means for applying pressure to the outer web relative to the second press drum, outlet means located downstream from the second pressing section for removing a relative dried suspension material, and means for separating one of the pair of webs from the other web of the pair downstream of the first pressure section and prior to the second pressure section, the other web of the pair passing as the outer web to carry the suspension material around a portion of the second press drum to the outlet means.

### Claim 2

Apparatus for removing liquid from a suspension comprising a pair of continuous webs movable over a portion of their length along a common path having an upstream end for introducing the suspension between the webs, a first pressing section including at least a first press drum about a portion of which the pair of webs pass, a second pressing section located downstream from the first pressing section and comprising a second press drum and pressure means for applying pressure to the outer web relative to the second press drum, outlet means located downstream from the second pressing section for removing a relatively dried suspension material, means for separating one of the pair of webs from the other web of the pair downstream of the first pressure section and prior to the second pressure section, the other web of the pair passing as the outer web to carry the suspension material around a portion of the second press drum, and a further continuous web which passes as an inner web around a portion of the second press drum.

### Claim 3 (depends on 2)

Apparatus according to claim 2 comprising means for applying controlled tension to the further continuous web.

### Claim 4

Apparatus for removing liquid from a suspension comprising a pair of continuous webs movable over a portion of their length along a common path having an upstream end for introducing the suspension between the webs, a first pressing section including a plurality of successive press drums of decreasing diameter in the direction of motion of the pair of webs about a portion of which the pair of webs pass, a second pressing section located downstream from the first pressing section and comprising a second press drum and pressure means for applying pressure to the outer web relative to the second press drum, outlet means located downstream from the second pressing section for removing a relatively dried suspension material, and means for separating one of the pair of webs from the other web of the pair downstream of the first pressure section and prior to the second pressure section, the other web of the pair passing as the outer web to carry the suspension material around a portion of the second press drum.

### Claim 5 (depends on 1)

Apparatus according to claim 1 wherein the pressure means comprises pressure belt means engaging the outer web over a substantial portion of the circumference of the second press drum to apply increased pressure thereto.