MAC Cell Deinking Cell

• One single cell where 2 or 3 SA or DA Verticel in series would, otherwise, be required. Or to replace 4, 5 or 6 conventional cells.
• Reject discharge is achieved through slight overpressure: this is adjustable and can be controlled without fiber being carried away in the foam. So in most cases secondary cells are not required. Losses and quality can also be optimized.
• Air is added through special canisters containing Autoclean injectors which are separate from the cell's body. If required, this permits the system to adjust the quantity of air added. Moreover, air bubbles adhere much better to the particles to be removed due to a special mixing chamber (reactivation chamber). The Autoclean injectors will no plug.
• The cell is fully closed and the air is recirculated. The cell will feature 3 to 5 stage depending on the application.
• Air passing through each chamber successively makes for better capture and removal of ink and other particles.

Applications

• To achieve high brightness through efficient ink removal.
• To achieve excellent cleanliness through black speck removal, across a wide range of speck sizes.
• To also achieve more selective elimination of some glues, latex particles and fillers.

Installation:
Space-saving system: a single cell (max. height 3800 mm) contains the required number of stages in series.

Example: 4 to 5 stages in preflotation and 3 to 4 stages in postflotation.

• A simple, self-contained system only requiring a minimum of piping for stock, air and rejects.
• Can be located either in basement or on an upper floor (machine floor)

Operation and Maintenance

• No cleaning, no shower, thus no fresh water consumption. The cell is always filled with stock and foam.
• Easy access to each stage through inspection doors.
• The pumps are the only rotating components.
• No servicing other than for the pumps, which operate to develop low pressure (max. 1.4 bar) with very well deaerated stock due to the ample sizing of deaeration chambers.
• Very low power consumption: at least 40% less than conventional Verticel cells.
• Instantaneous starting.
• Exceptional operating reliability thanks to the unpluggable Autoclean injectors and to the self-control boasted by the MAC concept.

Process and Performance

• Brightness: with the same losses, the MAC cell always yields 1 to 1.5 points higher brightness than existing systems.
• Owing to its greater selectivity with ink and fillers, the MAC cell with 5 aeration stages boasts a performance often close to that of hyperflotation.
• The MAC concept permits very accurate control of the level of turbulence in each cell zone. The air flow passing through each reactivation chamber is proportionate to the ink remaining in the stock to be treated. This is conducive to the removal of the biggest particles, which is quite negatively influenced by excessive turbulence. All measurements have proved that: the MAC cell develops an outstanding and steady efficiency over a very broad size range of ink particles and stickies.
• The optimum working consistency of the MAC cell is in the region of 1 to 2% for stock. The very well deaerated rejects leave the system at around 5% consistency. This results in substantial savings in energy and polymer addition during thickening.
• Fiber loss (> 200 mesh) is quite low.

Kadant Black Clawson Inc., 605 Clark Street, Middletown, OH 45042. Tel: 513-424-7400; Fax: 513-424-1747.