Stretch wrap and or stretch film are a stretchable plastic film that is wrapped around cartoons and pallets. stretch film elastic properties keep items tightly bound together for packaging, shipping, and storage. Economical polyethylene hi-clarity hi-cling stretch wrap film is offered as bundling stretch film, hand stretch film, extended core stretch film, machine stretch film rolls, we have it all.
Our Stretch wrap features superior break strength, cling, clarity, tear resistance not found in other stretch film. Extruded or cast polyethylene stretch film and stretch wrap is available depending on your stretch film need.
Stretch wrap material is linear low-density polyethylene or LLDPE, which is produced by copolymerization of ethylene with alpha-olefins, the most common of which are butene, hexene and octene. The use of higher alpha-olefins (hexene or octene) gives rise to enhanced stretch film characteristics, particularly in respect of elongation at break and puncture resistance. Other types of polyethylene and PVC can also be used. Many films have about 500% stretch at break but are only stretched to about 100 - 300% in use. Once stretched, the elastic recovery is used to keep the load tight.
methods of producing stretch wrap
There are two methods of producing stretch wrap. 1) Blown: the resin is melted and blown out, it is air-cooled. This is a slower process but provides for higher quality in all the areas listed below. The cost of production is also higher due to the quantity that can be produced per hour. 2) Cast: the film is passed over cooling rollers. This makes the cooling process quick. The quality is not as good as blown but more can be produced in an hour with lower costs. Other properties such as break strength, cling, clarity, tear resistance, static discharge, etc. are also important.
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