vanzari@infinitrade-romania.ro
+40 371 232 404|Mon - Fri: 08:00 - 16:30 (Romania time)
Infinitrade Romania – industrial equipment supplier in Romania

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    Equipment for the Paper Industry

    Pulp is viscous, fibrous and abrasive, and the accuracy of its consistency directly affects the quality of the finished paper, which is why dedicated pumps and sensors must tolerate fibres without losing measurement accuracy. We quote pumps for medium-consistency pulp, inline consistency sensors, heat exchangers, process control valves and vacuum pumps. Send the type of pulp and the consistency range for sizing.

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    Applications

    • Pulp preparation
    • Paper machine - wet end
    • Chemical recovery (Kraft cycle)
    • Specific wastewater treatment
    • Drying and finishing

    Equipment we supply for pulp and paper industry

    • Pulp pumpsCentrifugal and MC pumps for 3-15% consistencies, abrasion resistant
    • Consistency sensorsInline pulp consistency measurement for paper quality control
    • Heat exchangersHeat recovery from process water and condensate
    • Process control valvesValves with pneumatic actuator for flow and pressure control
    • Vacuum pumpsFor dewatering on the paper machine

    Brands often requested

    • Sulzer
    • SEEPEX
    • KSB
    • Alfa Laval
    • Nexson
    • SAMSON
    • Neles

    Frequently asked questions

    What is the difference between a centrifugal pulp pump and a medium-consistency (MC) pump?

    A standard centrifugal pump works well for low-consistency pulp (below about 4-6%), where the fibre behaves practically like a fluid. Above this threshold, the pulp forms a network of fibres that behaves more like a solid, and a conventional centrifugal pump can no longer grip the fluid at suction. Medium-consistency (MC) pumps, usually 8-15%, use a special impeller that locally breaks the fibre network, allowing efficient pumping without additional dilution with water - an important advantage for the mill's energy and water consumption.

    What accuracy must a consistency sensor for pulp have?

    Pulp consistency directly affects the quality of the finished paper (basis weight, strength, uniformity), and a deviation of only 0.3-0.5% can be visible in the final product or can trigger wrong adjustments downstream on the paper machine. Modern inline consistency sensors provide continuous measurement, without manual sampling. The sensor position matters - it must be mounted in a zone where the flow is typical of the process, without dead zones or excessive turbulence that would distort the reading. For selection, send us the consistency range and the type of pulp (chemical, mechanical, recycled).

    Which material withstands fibre abrasion and the chemicals in the Kraft process?

    Cellulose fibre is mechanically abrasive, and the Kraft chemical recovery cycle involves alkaline media and, in bleaching, oxidising agents - a harsh combination for the materials of wetted components. 316L austenitic stainless steel covers many general applications, but for zones exposed to bleaching agents, duplex stainless steel or higher alloys resist pitting corrosion better. For pumps carrying pulp with sand or abrasive impurities, we recommend impellers with surface treatment or hard materials in the suction zone, where wear is fastest.

    Which heat exchanger do you recommend for recovering heat from process water?

    Plate exchangers are common for recovering heat from filtered water or condensate, because they offer a large heat transfer surface in a compact space and can be dismantled for cleaning when organic deposits appear. For effluents with fibres, spiral or wide-channel exchangers are chosen, which clog less easily. The plate material is chosen according to the chemical composition of the process water - 316L stainless steel for most applications, titanium if the water contains high chloride concentrations. Correct sizing of the transfer surface, based on the flow rate and the available temperature difference, determines how much fuel or steam you can save annually on drying.

    What equipment do you offer for the dewatering vacuum on the paper machine?

    For the dewatering section (vacuum boxes under the paper machine wire), vacuum pumps must be sized from the air flow required at the target vacuum level for each zone of the machine - undersizing reduces dewatering efficiency and increases energy consumption in the subsequent drying. Liquid ring vacuum pumps are frequently used for this duty, thanks to their tolerance of moisture and of the fine particles entrained from the manufacturing process. Send us the vacuum level required in each zone and the estimated air flow for correct sizing.

    Other industries we supply

    Updated: 2026-11-12