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Machinery makers are being challenged to address the increasing demands of cast
stretch film — getting film thinner and thinner while improving strength and
flexibility. New technologies introduced at K 2013 have improved even more.
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In general, <a href="https://www.cnccib.com/" target="_self">cast film</a> markets
worldwide are healthy, and the cast stretch film market is particularly strong and
growing. It's solid in North America, growing at nearly 3 percent annually, while
growth is even higher in many emerging economies around the world. Despite the slowdown
that's taken place in many of those economies, as well as in many economically mature
regions, globalization of manufacturing means that a lot of shipping is going on.
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These days much of that shipping takes the form of pallets stacked with cartons or
other shapes of packaging traveling by ship, train and truck. Shippers believe all that
merchandise should arrive at its destination perfectly intact. Yet recent studies
estimate that annual losses due to products damaged in handling and transport cost
shippers about $2.6 billion.
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That is precisely the problem that rolls of stretch film have been relieving for
decades. Everyone involved with goods transport for any length of time has seen the
percentage of pallets securely wrapped in transparent film steadily increase. It is still
increasing, as is the strength of the film — even as it has gotten thinner and, as a
result, more sustainable and economical.
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Naturally, it took a parade of significant materials, machinery and processing
innovations to make stretch film stronger, thinner, lighter and more sustainable and
economical. And just as naturally, with stretch film usage rising, along with market
demands for improved performance and lower cost, the development of technology
innovations is holding its fast pace.
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Clear evidence of that is the variety of technological innovations coming from
machine line makers — often in concert with resin suppliers — that are now offering
stretch film processors options and tools to improve their products that, as recently as
10 years ago, were unthinkable. Examples: A leading supplier of cast stretch film lines
is moving what was a major off-line process to in-line; another longtime maker of cast
film lines has developed a totally new, stretch-film-specific winder to spearhead a major
push into that market.
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Steve Post, VP of cast film at extrusion and converting system supplier Davis-
Standard LLC, Pawcatuck, Conn., says about 80 percent of the total <a
href="http://www.cnccib.com/cast-film-machine/" target="_self">cast film machine</a>
market consists of stretch wrap, hygiene film (diaper back sheets, hospital gowns and bed
sheets, etc.) and cast polypropylene. Stretch is by far the biggest part, hygiene film is
growing and so is cast PP, <a href="http://www.cnccib.com/tpu-film/" target="_self">TPU
film</a>, <a href="http://www.cnccib.com/pe-film/" target="_self">PE film</a>, though
almost all in Asia.
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Suppliers of stretch film in North America are bullish about a market that's
growing at close to a 3 percent annual clip, says Post. And, he points out, it's
growing from a relatively large base. Suppliers feel resin prices will drop as natural
gas supplies increase. Shipping film made in the U.S. to Europe is well within the realm
of possibility.
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Post says one familiar trend is continuing in the stretch film market — downgauging.
A few decades ago film that was 25 to 30 microns, or around 1 mil thick, was considered
thin. Post says his company's lines are now making stretch film as thin as 6 microns
in the conventional process and the pre-stretch process, where the film is stretched in-
line to make it stiffer and thinner. That's thin for sure, but the real breakthrough
here is that the pre-stretching is being done in-line, on a station just before the
winder.
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Pre-stretch began in Europe about 10 years ago and began to take off about three
years ago in North America, where currently it's growing at a rate of more than 15
percent a year. But as Post points out, no one is doing pre-stretching in-line now. It is
being done off-line using rewinders. Aiming to change that, Davis-Standard launched its
new dsX s-tretch pre-stretch cast film extrusion line at the K 2013 show in Düsseldorf,
Germany, and made pre-stretch film in-line on a working line at its German facility.
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Fast forward to now, when Post says Davis-Standard has perfected the process of doing
pre-stretch in-line. Its first installation takes place this month in Southeast Asia.
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"We only had run at a limited speed," he says of last year's K show
display. "Now we're running near 1,000 meters per minute. We've run at
speeds faster than the industry."
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The dsX s-tretch line is 2 meters wide so it has a lower footprint but allows for
growth. Because it uses pre-engineered technology, it can be available in as little as
six months in five- and seven-layer options. In the future, the line will be offered with
environmentally friendly coreless technology so both material and disposable costs will
be reduced.
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Some benefits of making pre-stretched stretch film in-line vs. off-line are obvious:
no production floor space taken by rewinders, less movement of rolls across the
production floor, reduced labor and a lot of time saved. Fans of lean manufacturing will
love it.
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But Post says there's another benefit that trumps all the others.
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Most cast film processes are limited by line speed: how fast you can cool the film,
or pin the web to the chill roll out of the die. As film keeps getting thinner with
machines like <a href="http://www.cnccib.com/cast-film-machine/pe-film-machine/"
target="_self">PE film machine</a>, <a href="http://www.cnccib.com/cast-film-
machine/tpu-film-machine/" target="_self">TPU film machine</a>, <a
href="http://www.cnccib.com/cast-film-machine/eva-film-machine/" target="_self">EVA film
machine</a>, etc., if line speed doesn't increase the net output of the line drops.
Most cast stretch film, both hand and machine rolls, is sold by the pound. Lower machine
output is a problem for the processor. Post says that with in-line pre-stretch, the
processor can make film from the die at a slower speed — conventional process limits are
1,600 to 1,800 feet per minute — but if the film is stretched three times in-line the
result can be an effective line speed greater than 3,000 feet per minute.
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