Rejects dewatering press OLV Design is primarily designed for an installation in the lines for waste paper processing, i.e. for dewatering rejects from pulpers (horizontal or vertical), periodical reject separators PSN, rejects dewatering drums OBN and rejects dewatering conveyors ODV. Its compact and rugged structure enables to induce high dewatering pressures to compress incoming waste (rejects) to a minimum volume and to press out of the rejects a maximum volume of water. When installed in the waste paper processing line, the press reduces costs for waste disposal  considerably and improves an environmentally friendly operation of the whole line in a significant way.

It is a big advantage, if the incoming rejects enter the press being already dewatered (for example from dewatering drum OBN or from vibrating screen VP). This considerably improves the press capacity and operating conditions.

Design

This compact press consists of a rugged structure with a twin operating horizontal conveying screw and segment screens jacketing. Its working medium (rejects with high content of water) enters a feeding chute and there it is pressed by a rotary screw movement against a hydraulically controlled flap. First, the water is removed by gravity being mixed by the screw.

In the pressing zone, the given medium is pushed against the gate. Afterwards, the dewatered and compressed waste is discharged into a container. During the whole process, the waste water goes through screens and a sink for further treatment (i. e. it returns to the system as process water for the pulper).

Main parts

• Horizontal press with twin-operating screw (1)
• Feeding chute (2)
• Segment screens (3)withside protecting bars
• Hydraulic controlled flap (4)
• Collecting chute (5)
• Electric motor with gearbox (6)

Material

• All parts coming in contact with the stock are made of stainless steel, or structural steel protected with hot-dip galvanising
• The gearbox, screw and screens are made of structural steel protected with high-quality coating
• The connecting material is made of stainless steel or its surface is treated with hot-dip galvanising

Machine design and work safety are in compliance with the EU standards and EAC.

Rotary reject dewatering drum OBN is designed for dewatering of washed rejects during separation of impurities from a pulper treating waste paper and periodical reject separator PSN and for thickening unpulped rejects discharged into drum OBN while cleaning the pulper tank. The rotary dewatering drum parameters are determined by an actual grade of impurities in waste paper and by the type of these impurities. The dewatering drum OBN-10 capacity ranges from 40 to 60 3 m /h and OBN-20 capacity ranges from 70 3 to 100 m /h. The capacity depends on the reject input consistency and the type of impurities.

The ingoing reject should be properly deflaked and washed so that the fibres input consistency is less than 1 %. Afterwards, the
outgoing reject dryness ranges from 10 to 20 % with an insignificant loss of fibre. The machine can be used as a special accessory for a pulper tank cleaning (horizontal or vertical type).

Design

The dewatering drum is usually anchored to a concrete base or steel structure under which there is a collecting sump. The water is pumped out of the sump into a pulper. The OBN-10 is driven by electric geared motor, which rotates the perforated drum on driving rollers. The OBN-20 drive is made through a gear train.

Main parts

• Machinery frame (1) with cover (2) and safety cover (3)
• Dewatering perforated drum (4) bedded on four rollers
• Rollers bedded on pins (5)
• Electric motor with gearbox with soft starter (6)
• Shower pipe for cleaning the perforated part of the drum (7)

Material

• All parts coming in contact with the stock are made of stainless steel
• Other machine parts are made of usual engineering materials

Reversal centrifugal cleaners VOV a VTV  belong to the family of the cleaners with a free vortex and a drainage of separated impurities into a collecting pipe. They find their use when removing very light impurities and air from the stock. The cleaners work separately or in stations.

Air centrifugal separators VOV  are designed to remove free and dispersed air from the stock in paper machine approach flow systems. Basically, they are identical to the VTV cleaners. They are of a larger-sized structure due to larger throughput volumes.

Cylindrical centrifugal cleaners VTV  are designed to high-efficiently separate stickies and very light and bulky impurities (like styrene foam particles and plastic scraps) as well as free spinnable impurities in the waste paper lines. Their parameters (performance, efficiency, etc.) put them above the conventional MOVI VO/VU cleaners. The VTV cleaners are preferentially designed to work in multi-stage stations, in special cases they may even be operated as independent units. Their advantages are high cleaning efficiency and good operation reliability. Their secondary effect is deaeration of cleaned stock. They are able to work at cleaned stock consistencies of upto1.25%

Main parts

• Inlet part (1)
• Work cylinder (2)
• Outlet body (3)
• Bracket (4)

Material

• All machine parts coming to contact with the stock are made of stainless steel
• Other parts are made of structural steel

Machine design and work safety are in compliance with the EU standards and EAC.

Reject dewatering conveyors ODV are designed to primarily dewater rejects (mixture of water and solids such as paper clips, residual hardened paper, pieces of wood, pipes, etc.) especially from vertical LCV or horizontal HV waste paper pulpers and periodic impurity separators PSN. Together with reject dewatering presses OLV, they form a complete solution of reject dewatering.

Machine design and work safety are in compliance with the EU standards and EAC.

Machine parts

• Stainless vat (1)
• Shaftless worm (2)
• Screen (3)
• Skids (4)
• Electric gearbox (5)

Material

• The machine is made of stainlelss steel
• Shaftless worm and skids are made of carbon steel of higher strength

Sand separators PSP  are primarily designed to separate sand from mixtures captured in sandtraps of various types used in reject nodes of stock  preparation lines. Their secondary function is to separate light impurities. Sand is poured out by an inclined screwshaft located in the bottom part of the machine vat. Light  impurities are raked off by a pneumatic device on the vattop. The vat is divided in a collecting/stilling part and an inclined part where the impurities are taken out. The screw shaft design enables a high efficiency of separating fine particles. The machine operation is either continuous or intermittent with periodical light impurities raking from surface making easier pouring themout. 

Design

The machines are of the same design and they differ above all in the screw shaft inclination. The design is chosen with regards to the technological position and the sort of processed matter.

The machine is anchored on concrete foundations to raise the reject output neck. The screw shaft is driven by an electric gearbox fixed to the machine vat. The rake device is driven by means of a pneumatic cylinder.

The mater input neck is in the vat top part,the output neck is behind as lide keeping the surface stable. The vat is equipped with an emptying neck in the bottom part.

Main parts

• Stainless vat(1)
• Screw shaft glanded bearing (2) – in the vat bottom part
• Screw shaft(3)
• Individual work or work in a unit
• Screw shaft drive(4)
• Light impurities raking device(5)

Material

• All the machinery metallic parts are made of stainless steel
• The raking device moves on special sliding plastics
• All the joining material is made of stainless steel

Accessories

• Pneumatic cylinder limit switch connection coupling box
• Pneumatic cylinder air connection switch box
• Machine control board

Machine design and work safety are in compliance with the EU standards and EAC.

Pumps are designed to transport papermaking stock at consistencies up to 6 % and at pH values of 6.0 to 8.0 and to pump water, polluted liquids and sludges. Depending on process conditions, centrifugal pumps, fan pumps, screw pumps and other pump sorts are delivered. Fan pumps before paper machine headboxes are equipped with special low pulsating impellers.

Pump choice

Pump parameters and types are specified based on mechanical projects. Choosing a single pump the following must be specified:

• Pump positioning in the line
• Pump throughput (min., max.)
• Pump delivery height or delivery pressure
• Stock specification (pumped stock sorts, consistency, pollution)

Design

A basic configuration of the delivered pump can be completed with a frame, an electric motor and a frequency converter.
The pumps are delivered with cord seals. On demand and/or depending on pumped medium a mechanical seal can be used.

Main parts

• Spiral case (1)
• Impeller (2)
• Shaft with bearings (3)
• Coupling with cover (4)
• Foundation frame (5)
• Electric motor (6)

Material

• All parts coming to contact with the stock are made of stainless steel
• Other parts are made of structural steel with protective coating

Accessories

• Pump delivery battery limits are input and output flanges without joining material and seals
• Frame without anchoring material
• Pre-bored coupling in the impeller shaft including cover

Machine design and work safety are in compliance with the EU standards and EAC.s

Sand traps OP are designed for removing sand and larger impurities in coarse contaminated waste paper processing lines directly behind the primary cleaning stage and then in any insufficient separation of sand from paper stock. They provide considerably higher protection of the following equipment (pumps, secondary cleaners, etc.) against contingent damage.

Design

Sand traps work independently or in a unit according to the actual onsite operating conditions. They differ from each other only in size and throughput. They belong to a family of centrifugal cleaners working with a free whirl and automatic discharge of impurities into a collecting box, being permanently rinsed by water (OP-25, OP30) or mechanical discharge of impurities (OP-40). The sand traps provide effective and yet economical screening of specifically coarse impurities also from very coarse pulped stocks Machine design and work safety are in compliance with the EU standards and EAC.

Machine design and work safety are in compliance with the EU standards and EAC

Sand traps are designed for:

• Protection of all the consecutive machinery in the stock preparation line against penetration of hard and abrasive impurities
• Economical cleaning of coarse impurities from highly contaminated paper stock
• Screening of coarse impurities in lines based on waste paper and in wood refining lines
• Individual work or work in a unit

Main parts

• Input body with working cone (1)
• Separating body with separating filler(2)
• Sight glasses (3)
• Gate valves (4) pneumatic and manual
• Collecting box (5)

Material

• All parts coming in contact with the stock are made of stainless steel
• Other parts are made of structural steel
• Collecting box is made of grey cast-iron

Periodical reject separator PSN belongs to a family of secondary pressure pulpers. The machine is designed particularly for separation of undesired impurities, such as foils, plastic particles, leathers, rubber pieces, rags, woods, etc. from continuous pulpers of waste paper (vertical or horizontal). The separation itself is achieved directly during pulping. Periodical reject separator can run both in permanent or intermittent operation according to the volume processed and grade of impurities contained in the waste paper. While running, the remaining residues of hardly pulpable materials are being deflaked and washed with the goal to reduce fibre loss to a minimum.

Design

Machines are based on a similar design. Particular types differ:

• PSN-30 – design with bottom reject branch and flat screen ∅ 600 mm
• PSN-31 – design with top and bottom reject branch and flat screen ∅ 600 mm
• PSN-40 – design with bottom reject branch and cone-type screen ∅ 800 mm

Accessories

• Input, reject, output, heavy impurities separator slide valve (OTN)
• Pneumatically controlled flap valve of diluting water
• Pneumatic distribution block and control system

Main parts

• Input section of working chamber (1)
• Working chamber (2)
• Output chamber (3) with sealing plug
• Functional elements: sorting screen (4)
• Wiped by working and pumping rotor (5)
• Machinery bedding (6)
• Stand (7)
• V-belt drive with a cover (8)
• Electric motor (9)

Material

• All parts coming in contact with the stock (working chamber, output chamber) are made of stainless steel
• Other machine parts are made of structural steel with polyurethane coating

Self-cleaning trash rack  is designed to separate solid floating trash (foils,polystyrene, wood, etc.) from white water dewatering devices. In the lines processing waste paper the racks are placed after the dewatering drums OBN and they prevent coarse flotates in water pits.

The working part is submerged in a drain between a retention vat OBN and a water pit. Polluted water flows through a moving screen belt where impurities are captured and carried out from the drain. In the top reversal point the trash falls down and the screen is cleaned by a brush. A hopper discharges the trash to a container or to a reject conveyor. The machine runs at the time intervals set according to the line parameters.

Machine design and work safety are in compliance with the EU standards and EAC.

Main parts

• Stainless frame (1)
• Belt drive with chain wheels and electric gearbox (2)
• Moving screen belt (3)
• Rotating brush (4) driven by worm electric gearbox
• Hopper (5)
• Machine anchoring (6)
• Covers (7)

Material

• All machine parts coming in contact with water are made of stainless steel
• Other parts are made of structural steel painted with double-component polyurethane coating
• Moving screen is combined of stainless steel and plastics
• All the joining material is made of stainless steel or is zinc coated

Spinning impurities cutter DZS is designed for mechanical cutting of spinning impurities tangle drawn from the pulper tank (horizontal or vertical type) when waste paper is pulped. Dovetailed sliding blades guiding provides higher rigidity and easier adjustment of the cutting action. Knives are provided with replaceable blades.

Design

A tangle of impurities that is drawn out of the pulper tank by the ragger contains spinning impurities, such as thin wires, strands, synthetic foils, etc. This tangle of impurities is put in the hydraulic shears, between the fixed and sliding blade. The tangle is cut into pieces of required length depending on customer’s requirements. The cutting process itself is controlled by push buttons on the control board.

Machine design and work safety are in compliance with the EU standards and EAC.

Main parts

• Hydraulic shears with knives: fixed (1) and sliding (2)
• Hydraulic cylinder(3)
• Hydraulic unit (4)
• Safety features for cutter guiding (5)
• Control board including accessories

Material

• The cutter parts are made of structural steel and protected with a high-quality coating
• Knife blades are made of special abrasion resistant steel with high hardness
• All connecting material is made of stainless steel or its surface is provided with a zinc coating