Types of Stretch Wrap

There is a wide range of stretch wrap films available, each with different qualities that address specific wrapping application needs, such as load size and type, performance requirements, and budget.

Two basic manufacturing methods are used to create stretch wrap – blown and cast:

Blown Stretch Wrap

Manufactured using the blown film extrusion process. This involves forcing molten resin through a ring-shaped die to form a continuous tube of plastic, and inflating it with air to form a bubble. The bubble is carried through variable speed rollers to the point where it reaches the required size and is then cooled by air to convert it into a solid film tube of the desired thickness or gauge. The tubing is then guided by pinch rolls to flatten it out, and then it is wound, slit and trimmed to produce rolls of film.

Cast Stretch Wrap

Manufactured using the cast extrusion process. This involves extruding molten resin through a slot die, which forces a thin layer of film on to a chilled, turning roll or drum. This cools the film on one side, before it is sent through to a second roller for cooling on the other side. Finally it passes through a series of rollers that will determine the nature and properties of the cast film, including thickness. The film is then cut as required and rolled into rolls of stretch film.