Packaging - Plastic Bags, Paper Bags

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Extrusion is one of the common methods for fabricating polyethylene into plastic bags, while polyethylene itself is manufactured from processes that depend on crude oil and natural gas. Blown film extrusion involves melting the plastic resin into a pliable state and then extruding it into a die. This die differs from the standard extrusion die in that it is cylinder-shaped and has a small circular opening with an air ring attached to the top.
 
As the plastic resin is extruded, it forms a thin tube while air enters through the opening in the die and causes the tube to expand into a bubble. The air ring blows onto the plastic’s surface to cool it and the tube is moved upward by a pair of nip rollers. The speed at which these rollers move the plastic can determine the final product’s thickness. The nip rollers also flatten the plastic into a double-layered film with a width roughly half that of the bubble’s earlier circumference. This flattened film can then be cut into sheets or rolled up. To produce the bags, plastic sheets are sealed together across their width, which can be performed as part of the blown film extrusion process or at a later assembly stage.
 
Aside from their traditional application as containers, plastic bags can also be used for a broad range of other purposes. For example, they can be used to line trash cans, as freezer bags, to shield wiper blades from frost, as anti-static bags, mailing bags, or for waterproofing clothing and other vulnerable goods. The ubiquitous presence and inexpensiveness of plastic bags makes them quite convenient for many simple storage and packaging needs.

This packaging category also covers paper bag manufactures. Paper bags are increasing in popularity due to their less reliance on non-renewable resources for production.

Suppliers With This Capability

Forme Technologies Pty Ltd   Carrum Downs VIC