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Cast film machine technology fuels growing stretch film market

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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.

 

In general, cast film 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.

 

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.

 

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.

 

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.

 

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.

 

Steve Post, VP of cast film at extrusion and converting system supplier Davis-Standard LLC, Pawcatuck, Conn., says about 80 percent of the total cast film machine 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, TPU filmPE film, though almost all in Asia.

 

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.

 

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.

 

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.

 

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.

 

"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."

 

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.

 

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.

 

But Post says there's another benefit that trumps all the others.

 

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 PE film machineTPU film machineEVA film machine, 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.

 

One additional benefit of pre-stretching worth mentioning: It results in a stiffer film, and that means better load retention and much lower load movement on stretch-wrapped pallets. Since the pallets and their contents are better supported during the transportation cycle, there should be less waste caused by damaged goods and more smiling shippers.

 

Though most stretch wrap film is made of 2-4 melt index linear low density polyethylene, some metallocene-catalyst materials may be used to increase puncture resistance or to give better properties to the tack layer. Polypropylene may be used to make the film stiffer overall. But when any of these are used in a film structure they are 5 to 10 percent of the content, at most. Linear low is still the go-to material, and there is one technological development in cast film that may help it keep that title.

 

Regarding another trend in cast film technology: Post says that though most cast stretch film uses five- or seven-layer structures, there has been a lot of discussion recently about microlayer and nanolayer structures. Extrusion die makers Nordson Extrusion Dies Industries LLC (EDI) and Cloeren Inc. both supply feed blocks that can make film structures in the 20- to 35-layer range.

posted Jan 24 by Nn76z14

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Backlit Film Printing The Eco-friendly Way

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There are many options in today's digital world when selecting the right media for your wide format inkjet backlit application. Understanding your application needs, and the differences between substrates, is key to selecting a backlit media that will make your signage radiant.

 

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What is the difference between hydraulic bending machine and CNC bending machine?

Casting technology has a long history in our country. The overall cost of the workpiece is very low, mainly by smelting the metal into a liquid, and then pouring the liquid into a specific forming mold. After the liquid metal is cooled, a shaped casting is formed. The casting technology is to burn some steel material in a charcoal fire, and then quickly pull the red steel out and put it into an air hydraulic hammer for forging.

 

Bending machine blade mould

The reason why CNC bending machine molds choose forging instead of casting is because casting generally requires steel mills to produce rolled blanks, and steel mills are willing to produce when there are many standard parts, but standard parts for CNC bending machine molds Generally not many, it is not very cost-effective to use castings in general.

 

Numerical control bending machine molds also have high requirements for strength. Castings are prone to bubble formation during the production process, which makes the strength not as good as forgings. Forgings are forged by air hammers, and the interior will be more rigid, so the strength will Larger, so CNC bending machine molds generally choose forging rather than casting.

The CNC bending machine is an ordinary hydraulic bending machine with a CNC operating system. It is an upgraded product of the ordinary bending machine. Frequent process conversion can reduce the labor intensity of the operator. However, the operating skill of the operator is higher than that of the ordinary hydraulic press brake.

 

Compared with the hydraulic bending machine, the CNC bending machine is characterized by its CNC operating system. This is an upgrade to the ordinary bending machine, which reduces the labor of the operator and enhances the processing efficiency. But at the same time, the operating requirements and skills of CNC bending machines are much higher than those of hydraulic bending machines, and they are relatively complex. The CNC bending machine has a multi-step programming function, which can realize multiple automatic operations and complete the one-time processing of multi-step parts.

 

In the hydraulic bending machine, the coil is energized by the wire, and the gravitational force is generated on the pressure plate after the energization, so as to realize the clamping of the thin plate between the pressure plate and the base. Due to the electromagnetic clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side walls can be processed.

 

The hydraulic bending machine includes a support, a workbench and a clamping plate. The workbench is placed on the support. The workbench is composed of a base and a pressure plate. The base is connected to the clamping plate through a hinge. The base is composed of a housing, a coil and a cover. The coil is placed in the recess of the seat shell, and the top of the recess is covered with a cover plate. When in use, the wire is energized to the coil, and the gravitational force is generated on the pressing plate after being energized, so as to realize the clamping of the thin plate between the pressing plate and the base. Due to the electromagnetic clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side walls can be processed.

CNC bending machine and CNC folding machine

CNC bending machine and CNC folding machine in sheet metal forming, from the following six aspects of the characteristics of the comparison:

(1) different forming principles

Bending machine -- bending Angle is controlled by controlling the amount of upper and lower pressure. When bending, the short side is included. Operators need to lift most of the materials on the outside. Edge folding machine - after the plate is placed flat on the work table, the edge holder is pressed down to fix the plate, and the edge holder is flipped up and down to achieve the edge folding. In all the edge folding processes of an edge, manual positioning and auxiliary turning and positioning work are no longer needed.

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