If you have any needs pls contact me-
Whatsapp number of Ivy: +852 57463641 (My Wechat +86 18933510459)
Email me: 01@songhongpaper.com
Waste paper bundles are transported from the distribution station to the HeliDyne™ intermittent shredder via conveyor. The shredder breaks down the waste paper into fibers and separates ink particles through chemical treatment. The resulting pulp is then sent to the Beloit BelPurge™ purifier, which removes impurities. The BelPurge unit functions similarly to a coarse sieve, allowing fibers to pass through while retaining impurities. Water is used within the system to flush out contaminants, enabling fiber recovery while eliminating unwanted materials.
The purified pulp exiting the BelPurge unit is transferred to the slurry storage tank and subsequently directed to the mixing tank as required. The tailings discharged from BelPurge undergo dewatering through a circular screen before being discarded.
Prior to entering the deinking system, the pulp must undergo thorough purification and screening. High-concentration desanders treat the pulp from the mixing tank, removing heavy contaminants such as small stones, glass, staples, nails, and paper clips using centrifugal force. The tailings from this process are collected and automatically discharged, while the cleaned pulp is conveyed to the first M-R coarse screen (M-RTM). The accept stream from this screen enters a collection box before the deinking unit. Tailings pass through the second and third M-R coarse screens to recover any entrained good fibers.
The pulp is diluted with clear filtrate before being pumped into multiple pressure deinking modules (PDM™ flotation cells). Compressed air is introduced at the inlet of each PDM unit to generate bubbles within the tank. Ink particles adhere to these bubbles and rise to the surface, where they are removed and directed to a cyclone separator for air-tailings separation. Cyclone underflows are collected in an overflow box, combined with other tailings streams, and pumped to a gravity screen dewatering machine for preliminary dewatering. The concentrated tailings are further processed in a filter press to achieve approximately 50% dryness before being sent to the boiler. Chemicals are added in the pulper to enhance flotation efficiency by promoting ink particle coagulation, making it easier for bubbles to capture ink flocs compared to individual particles.
The pulp exiting the PDM unit is directed to the Uniflow™ purifier to remove lightweight contaminants such as adhesives, wax, and plastic. The pulp enters tangentially from the top, with residue exiting from the bottom and flowing into a storage tank before clarification. The accept stream exits tangentially from the bottom and is pumped to the Posiflow™ purifier, which separates heavier impurities. In this unit, pulp enters from the top, and clean pulp exits from the bottom, while debris is discharged separately. Two parallel channels ensure efficient removal of visible dust and ink particles.
Following purification, the pulp passes through the first fine screen, followed by the second and third fine screens. Tailings from the latter two screens are recycled to recover residual fibers. Fine pulp from the first and second screens flows to the Beloit Polydisk™ filter. The fine pulp from the third fine screen is recirculated to the second fine screen. Tailings from the Posiflow purifier and coarse screens are collected in the pre-slurry tank of the gravity screen dewatering machine.
The Polydisk™ filter is used for pulp concentration and washing, during which small ink particles are removed with water. The pulp exiting the Polydisk™ filter is further concentrated in a dedicated filter press to achieve high consistency. The filtrate from the Polydisk™ unit is clarified and reused as dilution and spray water. Filter press filtrate is recycled back to the PDM unit as makeup water. The dewatered pulp is conveyed to the Diskperser via a steam-heated belt conveyor and then pumped to the high-consistency pulp storage tank for blending prior to papermaking.