The disadvantage of rotary processes:
Limited size of cut part: we have
the capacity to cut 10"x 26" and will soon be adding a 12" and a 20" wide press. It is possible to go up to 60" wide, but for practical and cost reasons, most rotary cut parts are less than
36" wide.
The cost of a rotary die is generally
greater than that of a steel rule die, especially for larger
patterns and simple shapes.
The material must be supplied in roll
form, though in some cases, sheets can be viable. Some materials
are hard to find in roll form and in small quantities. We
have extensive experience in finding materials and can help
locate what you need through a network of distributors and
resellers.
Though there are fairly effective
stripping processes available to remove internal cut outs
such as tractor holes, it is difficult to insure %100 clean
parts.
The blades cannot be easily added
or moved on existing dies. Blades that are too badly damaged
can cost more to repair than it would cost for a new die.
Other considerations:
Inherent in any high speed process,
is the problem of handling the parts and the trim as it comes
off the press. The simplest solutions involve winding the
product back up or dropping the parts into a box. For many
products, these are not viable options. For these, additional
processes must be used such as shingling on a conveyor, stripper
bars, and hand stacking.
In most cases, not all the raw material
becomes part of the finished product. The left over material
is called trim if it comes off in continuous strips and slugs
if it comes off as discrete cut-outs. Special consideration
must be given to the layout of the part on the die to optimize
the use of the material and the separation of the trim and
slugs from the finished part.
There some limitations as to the blade
configuration when converting thicker materials. For example,
it is not recommended to place two blades 1/16" apart when cutting .040" thick HDPE.
Some materials are sensitive to the
chemicals in the tool steel and others are corrosive to the
tool steel. In these cases, there are
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