Slitting Machine-Paper Slitter
Roll slitting is a shearing operation that cuts a large roll of material into narrower rolls.
There are two types of slitting: log slitting and rewind slitting. In log slitting the roll of
material is treated as a whole (the 'log') and one or more slices are taken from it without
an unrolling/re-reeling process. In rewind slitting the web is unwound and run through
the machine, passing through knives or lasers, before being rewound on one or more
shafts to form narrower rolls. The multiple narrower strips of material may be known
as mults (short for multiple) or pancakes if their diameter is much more than their width.
 For rewind slitting the machine used is called a slitter rewinder, a slitter or a slitting
machine - these names are used interchangeably for the same machines. For particularly
narrow & thin products the pancakes become unstable, and then the rewind may be onto a
bobbin-wound reel: the rewind bobbins are much wider than the slit width and the web
oscillates across the reel as it is rewound. Apart from the stability benefit it is also then
possible to put very long lengths, (frequently many tens of kilometres), onto one bobbin.
Several methods are available for soft materials like plastic films and paper. Razor blades,
straight, or circular blades are being used. Some blades cut through the material while others
crush the material against a hard roll. Those are similar to knives and cut the material into
narrow strips, which may be called coils when being rewound. The cuttings blades can be
set to a desired width. Some machines have many blades to increase the options of cutting
widths, others have just a single blade and can be set to a desired location. The slit material
is rewound on paper, plastic or metal cores on the exit side of the machine.
The process is used because of its low cost and high precision for mass production. Some
machines have a program that monitors the blades and sharpens the blades often to maintain
the quality and precision of the cut. Depending on the industry and the product that is being
slit these machine can run between 10m/min (special metal webs) and 5000 m/min (paper
making process). The machines can also incorporate extensive automation to precisely control
material tension, automatically position the slitting knives, automatically align the cores onto
which the material is wound and to reduce manual handling of the rolls.
Examples of materials that can be cut this way are: adhesive tape, foam, rubber, paper products,
foil, plastics (such as tarps and cling wrap), glass cloth, fabrics, release liner and film.
See also: Shearing (metalworking)
For harder materials, such as sheet metal, blades cannot be used. Instead, a modified form of
shearing is used. Two cylindrical rolls with matching ribs and grooves are used to cut a large roll
into multiple narrower rolls. This continuous production process is economical yet precise;
usually more precise than most other cutting processes. However, the occurrence of rough
edges known as burrs are commonplace on slit edges. Also, the geometry of these rolls is
determined by specific tolerances in addition to the type of material and workpiece thickness.
For metal coils, the slitter consists of three main parts: an uncoiler, slitter, and recoiler. The
material is fed from the uncoiler, through the nip between the two circular cutting wheels
(one on top and another underneath), and then re-wound in slit pieces on the recoiler.
When the term "slitter rewinder" or "slitting machine" is used to describe the machine, the
three parts are referred to as the unwind, the slitting section and the rewind. Slitter rewinders
are normally used to slit plastic films, paper and metal foils. The unwind stage holds the roll
stably and allows it to spin; it is either braked or driven to maintain accurate tension in the
material. Some machines have a driven unwind which reduces the effect of inertia when
starting to unwind heavy rolls or when the material is very tension-sensitive.
The slitting section has three main options:
Razor slitting, which is ideal for thin plastic films - the system is very simple and quick to set.
Although the razor blades are of low cost, they need to be frequently changed to ensure a
good quality slit edge.
Rotary shear slitting. Male and female circular knives engage to give a scissor cutting effect.
This system is used widely on paper, films and foils. Although the knives take longer to position,
they stay sharp longer than razor blades. The setting time can be reduced by using an automatic
Crush cut slitting. A male knife runs against an anvil. The system works well with certain materials including non-wovens and foams.
The rewind section also has options. The main type is centre winding using differential rewind
shafts. These shafts are becoming universal on most slitting machines. The differential shafts
ensure an even tension across the full width of the material. Closed-loop control of the winding
tension using feedback from load cells provides the total tension-control system required for
running tension-sensitive materials. Precise and accurate tension control is the key to good roll
slitting. Modern machines use AC vector drives with closed-loop feedback from AC motors.
When used with the correct control algorithms, they produce excellent results with the
minimum of maintenance.
Roll slitting is a technique heavily used by Converters (industry). The converter industry normally refers to companies who print, coat and laminate materials. A typical converter is a company that produces flexible packaging material for packaging food. This may involve purchasing large rolls
of plastic film such as biaxially orientated polypropylene (BOPP) which is then printed to the
customer's design and coated with cold seal adhesive for use on high speed packaging machines. This material is printed and coated in wide, large diameter rolls for maximum efficiency. The rolls are then slit, using a slitting machine, into smaller rolls of the size to be used on the packaging