Industry · Paper and Packaging
From screen clogging to coating defects, from felt life to white water recovery: filtration engineering that keeps process water under control at every stage of papermaking.
White water
Fiber recovery and closed loop
Starch
Coating line prone to agglomeration
Felt
Critical equipment blinded by sediment
Critical points
In papermaking, water is present at every stage of the system as both a carrier and a cooling fluid. Water quality therefore directly determines not only equipment life but also the surface quality and print consistency of the final product. In this context, process water filtration is not operational support but a fundamental variable of production quality.
The high-pressure spray nozzles used in the wet end of a paper machine are extremely sensitive to water purity. Micro-particles in the water clog the nozzles and cause uneven spreading of the pulp, which means losses in both quality and efficiency on the production line. Screens and felts are porous structures that remove water from the paper. Sediment in the water settles into these pores and blinds the felt; suction drops, sheet breaks increase and the felt has to be replaced prematurely. Separating sediment and sand from water circuits through filtration also minimizes abrasion in vacuum pumps and prevents mechanical failures.
Solution: Nozzle and vacuum pump protection
Print consistency on packaging paper depends directly on surface smoothness. Agglomerated starch or impurities in coating fluids cause fisheye or scratch defects on the paper surface, lowering print quality and increasing scrap. Starch lines require special attention because of their high viscosity and tendency to agglomerate. Self-cleaning or heavy-duty stainless steel bag filters separate agglomerates without interrupting the flow and stabilize coating quality. In plants that use recycled fiber, plastic residues, stickies and ink residues are far more concentrated in the system; filtering these impurities effectively is essential to protect final product strength and machine continuity.
Solution: Self-cleaning starch filtration
In modern paper mills, recovering the valuable cellulose fibers in white water lines is an economic necessity. The filtration system separates these fibers from the water and returns them to production, while the cleaned process water is reused in a closed loop, significantly reducing fresh water make-up and water costs. Here, filtration stands out as both an efficiency tool and a sustainability investment.
Solution: Fiber recovery and water savings
Paper machine
Select a stage on your line to see the Prosestim filters and micron range used at that point.
01 · Sand · sediment
Separating sediment and sand from water circuits reduces abrasion in vacuum pumps.
02 · High pressure
Micro-particles in the water clog nozzles and cause uneven spreading of the pulp.
03 · Blinding
Sediment in the water settles into felt pores and reduces suction; filtration extends felt life.
04 · Agglomerates
Self-cleaning or stainless steel bag filters separate agglomerates without interrupting the flow.
05 · Fiber recovery
The filtration system separates cellulose fibers from the water; the cleaned water is reused in a closed loop.
Applications
The same filtration principles apply across applications, with different material and micron choices.
Nozzle, screen and felt protection.
Starch and coating fluid filtration.
Stickies and ink residues.
White water and closed loop.
Products used in this industry
Each product page lists the micron range, material compatibility and operating conditions.
Self-cleaning filter housing, 10–3,000 µm, that cleans itself without stopping the line; no cartridge changes, no downtime
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Monofilament polyester bag filters, 20–1000 µm, rated up to 177 °C, washable and reusable
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Polyester felt bag filters, 1–200 µm, rated up to 135 °C; used on paint, coating and chemical lines
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Cut consumable costs with PP and SS 304 mesh washable cartridge filters, 50–300 µm, 500+ wash cycles
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Consumable-free filtration: stainless steel basket filter housing with washable basket, 10–3,000 µm
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Bag filter housing with 1–24 bag capacity and AISI 304/316/316Ti body; high flow, low pressure drop
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