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shrink wrap how?

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Shrink Buyers Guide

Shrink Wrap How?

About: How shrink wrap is manufactured and processed.

Shrink Wrap Quick Links
Shrink Wrap How • Shrink Wrap Film Manufacturer • Heat Shrink Wrap • Polyolefin Shrink Film •
shrink wrap 101 All Exlfilm products are coextruded films. Polymer resins are loaded into hoppers at the rear of extrusion equipment. These resins are then pushed through a heated barrel by a screw. When forced down the barrel the resins are melted and compacted then then finally forced through a circular die.

Intertape uses multiple extruders to feed into one die. The resin from each of these extruders is then layered over one another as the melt exits the die. This results in a multilayered product.

The extruded structure in the form of a tube is then turned upward, then back downward and filled with air. This process converts the tube into a bubble. This bubble is then stretched on both axis, horizontally by the air flow and vertically by means of a set of pinch rollers drawing the tube down. The act of stretching the film tube on both axis is known as bi-axial orientation. A bi-axial orientation gives the film many of the required strengths of a shrink film.

The pinch rollers collapse the bubble into sheet form where it is then rolled onto a core. This roll of material is called a mill log.

The mill logs are then converted into the finished product. Conversion entails slitting of the film to width and folding in the case of centerfold film. Preperforation is completed during this conversion process.

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