Flexible Packaging Glossary - T
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- Tear propagationThe ability of a packaging material to continue to easily tear once the tear has been initiated. Some plastics, such as polyethylene, have no tendency to continue to propagate an initiated tear.
- tear resistanceThe ability of a film to resist the propagation of a tear.
- Tear strengthThe resistance of a material to tearing.
- tensile strengthThe amount of pull a film can withstand without tearing apart or stretching.
- thermoformingA method of forming plastics where a plastic sheet is heated to a point where it is soft and formable.
- threadingThe placing of a web material through the various rolls and stations of any web-fed press such as a printer or laminator in preparation for production.
- three-side-seal pouchA pouch that is formed by folding the web material into a U-shape and then sealing the three open sides. The pouch may be made with a gusseted bottom. Three-side-seal pouches are typically made on horizontal form-fill-seal machines.
- tie layerA material that bonds two incompatible layers in a coextrusion.
- TolerancePermissible maximum and minimum deviation from the specified dimensions or qualities.
- transverse direction (TD)The direction perpendicular to the machine direction.
- Trap Print Another term for Reverse Printing (see Reverse Printing). Trap printing derives its name from the fact that the ink is trapped between the outer layer of material and the substrate.
- trappingIn printing, inks may be overlapped slightly by increasing the image size to ensure that no substrate shows through within the register variations of the printing press.
- tunnelingA laminating defect caused by incomplete bonding of the substrates.