Product Details Supplier Info More products

Lloyd Instruments is offering testing of stretch wrap film with the introduction of two test jigs for its LFPlus 1kN single-column materials testing machine.

The TG1075 is used for testing puncture resistance to ASTM D 5748-95 (re-approved in 2007), while the TG1167 is used for testing peel cling to ASTM D 5458-95 (re-approved in 2001).

In addition, the LFPlus can be used to perform a standard tensile test on stretch wrap film at very low force.

Stretch wrap film is used in applications ranging from heavy-duty pallet strapping to sealing food items in containers to keep them fresh.

Cling is critical in maintaining a tight wrap after an item is stretch wrapped to prevent the film from unwrapping during handling and transportation, while puncture strength is important for preventing accidental puncture damage, thus helping to maintain product freshness.

The TG1075 features a jig containing a 102mm aperture to support the stretch wrap film and a probe.

The jig is locked onto the base of the LFPlus using the machine anchor pin.

A removable upper plate allows the film to be mounted and clamped onto the jig and the probe is fitted to the bottom of the load cell.

The puncture-resistance test method imparts a biaxial stress to determine the resistance of film to the penetration of a probe at a single constant test speed of 250mm per minute.

For peel cling measurements, the TG1167 jig is fitted to the LFPlus.

A film strip is adhered to a flat film attached to an inclined surface on the peel jig.

The force required to remove the film strip from the flat film is measured.

The LFPlus can also be used for tensile testing of stretch wrap film by equipping it with an EX800Plus non-contacting extensometer.

The film samples have to be perfectly parallel or prepared dumbbells and are typically tested using TG33, TG74 or TG10 tensile grips.

The EX800Plus provides travel of 800mm and can accommodate the very long elongation that occurs during tensile testing of this material.

Lloyd Instruments

View full profile