Paper, cardboard & tissue

A manufacturer of testliners and corrugated medium used a rotary lobe pump from a competitor to convey starch in the production process. Testliner is two-ply or multi-ply layers made completely of recycled paper. It is the raw material and of major significance in the corrugated cardboard industry. Corrugated medium is made of recycled paper collected from households and department stores. To achieve optimum stiffness, this raw material is often treated with starch or resin.

The factory owner was not satisfied with the competitor's pump. The rotors suffered from wear extremely fast and the mechanical seals had to be frequently changed. The company approached Boerger GmbH and performed various tests with the Boerger Rotary Lobe Pump over four months. The Boerger Rotary Lobe Pump was equipped with stainless steel casing and stainless steel rotors. The Boerger pump was also equipped with seal flushing due to the quick-drying medium. 

All the tests concluded with positive results. The customer then started using the Boerger Rotary Lobe Pump. Since then there has been no downtime due to the mechanical seals nor any detectable wear on the Boerger stainless steel rotor. Even after interruptions in the production, there has been no impairment to the machine. The customer is so satisfied with the Boerger pump that 3 more of the same type were ordered.

Technical data

In the paper manufacturing process, the filter and press water is extracted from the fibrous water suspension in the paper machine. There are various levels of retention which depend on the type of paper being manufactured and the composition of the suspension. The retention indicates the proportion of the fibrous filling substances left in the filter compared to the complete retention of the substances in the waste water.

In the manufacture of hygienic tissues, such as toilet paper, tissues or facial tissues, a lot of fibrous substances remain in the water from filtering and pressing the fibrous water suspension.

This water is treated in the in-house waste water facility. The solids are concentrated before being removed from the water in a filter belt press. To transfer the water with all the solids into the filter press, a Boerger Rotary Lobe Pump is used at the  paper factory in West Germany.

Technical data

A paper manufacturer was looking for a pump to convey a special coating for finishing paper. The paper becomes stronger and more resistant to water with the application of this coating. The paper manufacturer had previously been using an eccentric screw pump. However, due to the eccentric screw pump's frequent downtime and the high cost of spare parts, the customer sought an alternative. The paper manufacturer opted for a Boerger Rotary Lobe Pump.

The coating hardened if was not kept flowing or if it dropped below a temperature of 20°C. To protect the seals of the Boerger Rotary Lobe Pump and to keep it clean, a rinsing unit was fitted to the pump which rinsed the seals after every charge. The intermediate chamber is constantly rinsed from the bottom to the top.                                                         

The customer is extremely satisfied. Now, through lack of downtime, the customer has already regained the cost of the pump after 8 months. The quality of the end product could also be optimized as the Boerger pump with frequency control is a better design than the previous eccentric screw pump.

Technical data

A paper and cardboard manufacturer uses recycled paper and wood powder in his plant to make cardboard. The wood powder (a fine sawdust) has the advantage of providing a lot of bulk yet still being very lightweight.

The wood powder is delivered and stored in a dry state. Before entering the production process, it is fluidized with water. To pump this wood powder slurry to a storage tank, the manufacturer uses a Boerger Rotary Lobe Pump.

From the tank, the frequency-regulated Boerger Rotary Lobe Pump dispenses the slurry into the production process in doses.

Technical data

In a company producing corrugated board base paper the separated process water, which is produced in the so-called “second cleaner stage“, flows from five cyclones into a small tank with a screen insert. A Börger rotary lobe pump in a stainless steel-version conveys the process water into a vibrating screen for further processing. Here the solids still contained in the water are separated. Afterwards, the water is conveyed to a solid/liquid separator. The solids are burnt. The filtrate is reused as gray water for the paper production.

Technical data

A Scandinavian manufacturer of tissue products uses a mobile Börger rotary lobe pump with ATEX-compliant design for conveying pellet sludge. The customer was particularly impressed by the gentle pumping of the medium and the ease of maintenance of the Börger rotary lobe pump.

Technical data

At the chemicals collection point of a printing paper manufacturer, the Börger pump empties the tanker trucks and conveys the latex into the storage tanks of the coating kitchen for further use. The stainless steel pump is equipped with double-acting mechanical seals. The mechanical seals are pressurized by means of a thermosiphon system. The pump was installed vertically next to the two other Börger pumps due to the limited space available.

Technical data

A paper manufacturer specializing in the production of special papers and wet-strength label papers uses a Börger rotary lobe pump for conveying coating color from the coating kitchen into the paper machine. The pump has individually pressurized shaft seals. This prevents any pumped medium from penetrating between the sliding surfaces of the seals. The tri-lobe screw rotors convey the medium with low pulsation.

Technical data

A Norwegian chemical company specializing in the production of raw materials for paper manufacturing uses an ONIXline rotary lobe pump for conveying process water containing solids. The pump conveys the medium with chemically aggressive components into a preheater. The fluid has changing viscosities from water-like consistency up to 6,000 mPas. The pump is operated by a frequency converter. The pump speed is adapted to the viscosity of the pumped medium. The efficiency of the ONIXline rotary lobe pump remains consistently positive even with changing viscosities and pressures of up to 14 bar. The productivity was improved and the energy consumption reduced.

Technical data

An international corrugated cardboard manufacturer required two waste water storage tanks for its own water treatment facility.  

They opted for a Boerger elevated tank, type 13.6 with a total volume of 1,025 m³ (4510 usgpm) (and a Boerger elevated tank, type 04.3 with a volume of 49 m³ (215.6 usgpm).

Technical data

A customer from the paper industry was looking for a pump with dry-run capability to transfer liquid bulking agent. The system also had to be very easy to maintain – that's why a Boerger Rotary Lobe Pump with radial casing liners quickly came up as the ideal solution. The result: high reliability and lower operating costs.

Technical data

An industrial company decided on a Boerger Rotary Lobe Pump for conveying lime milk. Fully elastomer-coated pistons and silicon carbide mechanical seals meet the requirements of highly abrasive pumping medium in an ideal manner. The low speed ensures gentle pumping and a long service life of the medium-wetted parts.

Technical data

A Börger Rotary Lobe Pump was installed at a packaging manufacturer for conveying a thick glue mixture in the production of corrugated cardboard. It is suitable for intermittent operation and also runs reliably and practically trouble-free even with this highly adhesive pumped medium thanks to the multi seal K shaft seal system.

Technical data

A Börger Rotary Lobe Pump is used in the recycling waste paper sector at a paper factory. It conveys liquid paper made of recycled paper. All medium-wetted inner parts of the rotary lobe pump are made of stainless steel and the lobe tips are coated with EPDM.

Technical data

A manufacturer of corrugated cardboard and fine and transparent paper was looking for a reliable and robust pump to convey starch suspension. The pump used at the paper manufacturer's was having serious problems with the seals from the starch suspension. Besides more security for the seals, the new pump needed to be suitable for pressure differences of up to  6 bar. The customer opted for a Boerger Select Rotary Lobe Pump for this purpose. The individually pressurized mechanical seals and extra quench chamber offer the customer additional operating safety.

Technical data