More and more manufacturers all around the world produced stretch wrap for products security purposes. Stretch film processors are being used in markets and every five years these have been doubled. The demands of stretch films developed in the mid of 1985 to 1990 with 250 million lb/yr up to 500 million lbs. In the following years after 1990, the orders puffed up to one billion lb until the end of 1995. During these years, the five-layer film was the most popular even in recent times, but the demands still continued to grow in binary digits. For the past two years, the demand for stretch film resin has cut out to 1.4 billion lb. Stretch wrap reached 65% to 70% cast film and most of these are for machine packaging, and for blown film it has 30% to 35% generally for product hand wrap and a little extremely pierce-resistant specialty films.
In the mid ’90s when five-layer stretch wrap were launched, the hexane or octane LLDPE with one and three-layer films became a replacement. This requires a five-layer feed-block and fourth extruder with the use of low-cost butane LLDPE that supported with thin layers of metallocene LLDPE. A regular five-layer composition is A-B-C-B-A having 10% hexane LLDPE exterior skins, 20% metallocene LLDPE as subsurface layers, and 40% butane LLDPE interior. This means that mLLDPE has a little content percentage and somehow this makes the stretch wrap fragile and substandard.
The demands have started depending on the variety of stretch wrap. Other manufacturers do not use mLLDPE as the main component of the films because they believe it is pricey. This perception of some manufacturers is actually the reason why the demands for stretch films have been stalled down for the past years. Others have been using different chemical-based components that are less expensive in the production of stretch films. It is then found out that most films made of these kinds can be easily broken because these are not as durable as the mLLDPE. Consumers always look for something that is of best quality and manufacturers should be aware for this in order to meet the high demands of the consumers.
Metallocene LLDPE resins are well-known for their exceptional flit impact and pierce resistance, better organoleptics, excellent heat seal advantages, brilliant lucidity and superior warm tack. These characteristics of mLLDPE stretch films are preferably apt for high-performance film applications like for medical wrapping, foods and goods packaging, and other applications. Metallocene LLDPE was also examined to have extensively enhanced sealing properties than other polymers, thus improve the packaging line pace.
Since the demands for stretch wrap continue to grow in as early as five years, manufacturers produce these products in a constant basis. Most of the manufacturers today fabricate mLLDPE stretch film not just to satisfy the consumers and meet their demands, but to give these consumers the privilege of using these products to different applications and purposes, and test how strong and effective these metallocene stretch films are in securing their goods.
Source by Tran Bing
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