polypropylene technical spec
curved_top

Polypropylene strapping - Technical information

Composition

Extruded polypropylene homopolymer manufactured in an ISO 9001: 2008 environment.

Tensile Strength

Polypropylene strapping is manufactured to strict dimensional accuracy with precision winding, straightness and high tensile strength. Machine grade polypropylene is purpose-made for fully automated packaging lines.

Joining Methods

The strap however, can only be as strong as the join used to secure - it is therefore vital that the correct method of joining a strap for its given weightload is achieved.

Either by hand tool manually with metal buckles or a range of seals, friction weld joint, or heat sealed. Small packages can be secured using plastic buckles.

curved_bottom

Breaking strength

The following is for example purposes only.
Many factors can affect the result:

FactorVariables
The type of package being strappedRigid/compressible
Sharp/round edges
Friction between items
The method of transportationInternal/export
Palletised/loose
The type of seal
Refer to tool/manufacturer for seal efficiency
Plastic buckle/metal seal
Friction/heatseal
Safety factor1.5 - 2.0 of weight load

As a rule of thumb; a safety factor between 1.5 & 2.0 is desired.
Total load weight = 500 kg
4 straps each of 300 kg breakload = 1200 kg
Seal efficiency 75% (Friction weld) = 900 kg
Safety factor = 900/500 = 1.8, between 1.5 and 2.0, so should be acceptable. Due to the many parameters that can affect the result, each unitisation can require different amounts and breaking strength of strapping.
The final specification is the responsibility of the applicator.

boxes with plastic strap newspaper bundle held by strapping polypropylene strapping strapped drums strapping_and_matting rolls of polyproylene strap


coloured_straps
Specifications at a glance:
Width9 - 32mm
Thickness0.4 - 1.5mm
QualityHand grade to fully automatic
Elongation14 - 20%
ColoursMany standard colours available. Please ask for any specifics required.
Polypropylene strapping safety data sheet download