What is Coil Slitting?
Coil Slitting is the process of taking a wider master coil and slitting (cutting) it into a series of narrower coils by running the material through a set of rotary slitting knives. Each smaller coil is called a mult. Mults can be customized to your specific width and/or weight and packaged accordingly.
What Materials Can I Slit?
Alliance Steel can slit coils with material thickness ranging from .010” - .500” under one roof. We can slit hot roll, hot roll black, hot roll pickled and oiled, cold roll, coated steel (hot-dipped galvanized, electrogalvanized, galvannealed, and galvalume).
What is the Coil Slitting Process?
There are three main parts to a slitter: the uncoiler, slitter arbors/rotary knives, and a recoiler.
Uncoiler: The master coil is loaded onto the uncoiler at the entry of the machine. Then the uncoiler uses an expandable mandrel to grip the master coil on its inside diameter. The coil rotates off the mandrel, and the head of the coil is threaded into the machine’s edge guides.
Slitter: The material is fed length-wise into the slitter head, which consists of two parallel arbors. These parallel arbors are mounted with a customized set of rotary slitting knives and rubber stripper rings. Rubber rings help pull the material through the slitter arbors, while the knives penetrate the steel causing the material to break or fracture.
The key to running an efficient precision coil slitting job is in the setup. Alliance Steel uses precision tooling and knives to ensure the best slit edges and a computer-automated system to assure spacing and horizontal knife clearances.
Rule of thumb: the harder the material, the less the slitting knives must penetrate. The softer the material, the deeper the knives need to go before the material slits/breaks.
Recoiler: The recoiler’s primary purpose is to wrap the slit coils back into a coil form for packaging and shipment.
Heavy Gauge Coil Slitting:
Are you looking for a partner to slit your heavy gauge material? Our heavy-gauge line can slit .043” - .500” x 84”, with an 80,000 – max coil on entry, corrective leveling up to .187” and narrow heavy slitting to a width of 1.250”.