Recycled paper mills face their own unique challenges, as feed stock varies from old corrugated cardboard (OCC), old newsprint (ONP), mixed office waste (MOW) and ledger paper (LED) to magazines and computer paper. These hydrocyclones also are effective in protecting screening equipment.įor chemical pulp applications, continuous rejects cleaners in two or three stages efficiently perform fine sand removal in the screen room. Protect your secondary knotters from rocks and gravel with our intermittent rejects cleaners. In applications where softwood and hardwood species are chemically digested to produce paper pulp, the product is mostly Kraft (sulfate) pulp. The applications for centrifugal cleaners in the pulp and paper industry can be divided into two major categories: chemical (or virgin) pulp cleaning and recycled fibre cleaning. Intermittent rejects cleaners discharge the contents of the grit pot periodically, without shutting down the cleaner. Intermittent rejects cleaners are hydrocyclones with the addition of a grit pot and isolation valves. These may be connected to a rejects header or rejects trough, if multiple cleaners are being operated in parallel.

Continuous rejects cleaners are hydrocyclones with conventional apexes. The basis for both types of pulp cleaners is the renowned KREBS Cyclone. Our Intermittent Rejects Cleaners collect larger debris and discharge it intermittently. Our high-density stock cleaners can be used in primary stock, as well as severely abrasive and corrosive secondary stock processes.Ĭontinuous rejects cleaners remove fine sand from paper pulp – typically in multiple stages. The solid design behind these highly efficient cyclones allow them to withstand corrosion, high temperatures and heavy loads of abrasive materials, such as glass, staples, wire and other debris.

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