SLITTER TOOLING

OVER ARM SEPARATORS

In any slitting line, there is an uncoiler, slitter head and recoiler. After slitting,
many strands come out of the slitter head. These stands are to be coiled separately,
neatly so that their edges are protected and packing, dispatch to actual user becomes
easy and productive; for which OVER ARM SEPARATORS are used. These over arm separators
are mounted on a separate shaft which is lifted hydraulically as the narrow width coils
keep winding. Over Arm Separators separate the narrow coils. Because of separators the
total width of slitted coils is more compared to wide width coil which is called Fan Out.
If number of strands are more, fan out is more. Generally, the face of recoiler is kept
off set by 1” from slitter face so that fan out on both sides from centre is equal.

Over Arm Separator Disc is an important item of Slitting Line Tooling. Slitted coils will
be nicely wrapped and packed without spoiling edges if Over Arm Separator Discs are of
good quality.

Over Arm Separator Discs are subjected to heavy wear and impact. Hence raw material
should be wear resistant and shock resistant.

SLITTING LINE TOOLING

1. FLATNESS
2. PARALLELISM
3. PERPENDICULARITY
4. CONCENTRICITY


FLATNESS

Flatness is also known as warpage. Flatness means total dial indicator reading while
putting slitting cutter on surface plate below dial indicator. Flatness is the peak
height of any point of the cutter from the surface plate minus actual thickness of
slitting cutter.

In slitting line, flatness causes slitting knife to dance on arbor. If flatness is F then
horizontal clearance of the knives will vary between (HC-F) & (HC+F) during every
rotation of knife.

PARALLELISM

It is total variation of thickness in a knife/ spacer. It can be easily measured with the
help of double probe comparator or micrometer. A knife though parallel may not be flat
and in that case slitting performance will be adversely affected.

Parallelism of each and every knife and spacer is important and should be within 50% of
thickness tolerance.

PERPENDICULARITY

In a slitting knife, bore should be square to face. In case of spacer it is not important
because bore of spacer is generally loose on arbor.

Slitting Knife is mounted on slitter arbor on bore. Bore and face of slitter knife should
be ideally square to each other so that knife runs perpendicular to slitter arbor.

CONCENTRICITY

Concentricity is the difference between centre point of O.D. of arbor and centre point of
bore of slitting knife. Theoretically this should be zero. This causes variation in
vertical clearance of slitting knife as cutter tends to move eccentric. If concentricity
is “C” then knife will move up and down by 2C.

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CUTTER, SLITTING KNIFE AND SPACER.
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HINTS & TIPS ON THE APPLICATION OF SLITTER TOOLING
GUIDELINES FOR RAW MATERIAL SELECTION FOR SLITTING LINE TOOLING
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