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Processors of stretch film can choose to go the cast-film route or employ a blown-film line but they can also make their product film go further via use of pre-stretch equipment.

PlasticsToday Staff

March 17, 2010

1 Min Read
Stretch film stretched to the max

After the stretch film has been extruded and slit into standard hand-roll width, individual rolls are loaded into the pre-stretch unit and, “Basically, one meter is stretched to 2.6 meters [at 8-micron thickness] so you get more mileage from the same kilogram of material. Plus, the film is easier to hand roll,” says Oswaldo Galvez, marketing director at blown-film line supplier Lung Meng Machinery Co. (Tainan).

Lung Meng offers single- and three-layer blown-film lines for stretch film, and special screws for processing 100% metallocene LLDPE. “An advantage of the blown-film approach is that the LDPE wrap film can also be made on the same line,” says Galvez. A complete system including pre-stretch unit sells for around $500,000. Multi-layer lines enable edge strips to be fed back to the line and application of polyisobutylene (PIB) adhesive.

Lung Meng also reports a resurgence in processing of garbage and T-shirt bags in the U.S., perhaps due to supply disruptions caused by recent anti-dumping cases against Asian processors. Last December, the company delivered 20 lines to a processor in Dallas, TX with outputs of 150 kg/hr. “This kind of setup allows the processor to be flexible in terms of bag sizes and printing,” says Galvez. —[email protected]

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