Home' FLEXO Magazine : January 2015 Contents SLITTER/REWINDERS
Slitter/rewinders are a common converting machine that many print-
ershave in their plants. But there are many types of slitter/rewinders
that together bring to the table a variety of slitting methods. All offer
a diversity of capabilities for wide ranging applications (paper, film,
foil and board). The key is to match the proper slitting/rewinding
technology to your application to get the best productivity, roll quality
and consistency to the finished product.
Many leading slitter machines utilize sophisticated automation to
precisely control material tension in the unwind and rewind sections,
and automatically position the slitting knives. In addition, core align-
ment for the rewind shafts and auto unloading will reduce manual
handling and efficiency. This type of automation delivers the quality
and consistency required to improve profitability. There are also many
types of rewind techniques, f rom two drum, single and double shafted
to single and multiple stations; all will depend on material and the
Many slitter/rewinders look similar, but their performance, con-
sistency and reliability can vary greatly. Converters should look for
slitters that have a wide range of capabilities. Having the ability to slit
and rewind small or large rolls, narrow or wider rolls and thinner or
thicker substrates than the competition can enable you to differentiate
yourself in the mass production slitting market.
Depending on the substrate, there are different kinds of slitting meth-
ods. In the film industry you will use a razor blade to cut, but depend-
ing on the substrate, you may cut in the air (between idler rollers) or
in the groove using a bottom shaft with pre selected tie and groove
dimensions. We use round fixed razor blades and burst cut, where the
round razor blade is actually rotating in a groove roller. Whenever
using a grooved roller and wrapping the substrate around this roller,
the slit will be more controlled than cutting in the air.
Shear cut is also used in the film industry, mainly in thicker materials.
When it comes to paper, shear cut is the most popular method in
use. We really use two different kinds of shear cut: The tangential cut
and the wrapped cut. The tangential cut has the bottom knife inline
between two idler rollers, where the wrapped shear cut wraps the
substrate around the bottom cutter and you control the cut.
Converting adds value to a preprinted or plain substrate. Each con-
verting process has its own learning curve and pitfalls. Quality sup-
pliers can provide not only the technology to build the equipment but
the training and after sales support to overcome the potential pitfalls
that a new process or machine can bring. It starts by understanding
what the end product is supposed to be, what process is required/pre-
ferred and then building with your supplier a customized solution.
Leading lamination and coating machine suppliers have pilot test
centers or small lab machines in house that can be used to prove a
process. Working together, the converter and supplier can form an
understanding of the project goals and what will be required before
the investment is made. And on the slitter/rewinder f ront, the best
manufactures can provide the ability to test the actual performance on
each new substrate or roll size that is required.
According to the Merriam-Webster dictionary, the definition of “con-
vert” is, “to change (something) into a different form or so that it can
be used in a different way.” Using the latest converting technologies in
laminating, coating and slitting/rewinding, printers can differentiate
themselves and create new profit opportunities. n
About the Authors: Steven Leibin and Wolfgang Ripper are the execu-
tive vice president of business development and president of Matik, Inc.,
respectively. Wolfgang is a noted slitter/rewinder industry expert with
more than 30 years of experience. Steve has been in the printing and
converting industry since 2001.
Matik is a distributor of advanced European equipment for the
converting, packaging and printing industries. The company is the North
American distributor of Goebel-IMS Deltamatic slitter/rewinders and
Olbrich coaters and laminators. Matik also provides experienced tech-
nical sales, parts and service support to customers in North America.
Learn more at www.matik.com.
Courtesty of Olbrich GmbH
Coming Soon: A new Internet Quarterly exploring complemen-
tary technologies, multiprocess printing and inline converting
options—package production in a single pass. www.flexomag.com
38 FLEXO | JANUARY 2015
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