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There are two basic
substrates used for strapping, plastic and steel. From these two
substrates, a number of different strapping products have been
created to meet a wide variety of packaging requirements. Your
Signode salesperson studies how your product is handled, shipped,
stored and received in order to make an unbiased, cost-effective
recommendation for your operation. |
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Types
of strapping
Strap characteristics
Plastic vs. steel strap
Application methods |
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Types
of strapping |
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Plastic
strap |
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- Polypropylene – best suited to light and medium duty
applications. Polypropylene resists splitting and has a smooth,
uniform surface with an elastic memory to absorb shock and keep
straps tight
- Polyester – best suited to medium and heavy duty applications.
Polyester provides superior retained tension under hot, humid
conditions. Provides greater load stability and is more tear
and snag resistant than other plastic strapping materials
- High-Strength Polyester – best suited to heavy duty applications
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Steel
strap |
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- Magnus – a cold-rolled, medium carbon steel with high
strength and excellent shock resistance
- Apex Plus – a cold-rolled, low carbon steel with superior
edge conditioning and coating
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Strap
characteristics |
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- Break strength – the tensional force, in pounds, required
to break a strap
- Working range tension – a range of applied tension whose
minimum may be zero on a fragile package to a maximum of the
highest tension level at which strapping is applied in actual
situations
- Retained tension – the ability of strap to retain its
tension levels despite the shifting and settling that occurs
during transit
- Elongation recovery – ability of a strap to contract
and remain tight when the package shrinks
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Plastic
vs. steel strap |
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Polypropylene |
Polyester |
High-Strength
Polyester |
Steel |
Break
strength |
Moderate |
Moderate |
High |
Highest |
Working
range |
Lowest |
Moderate |
High |
Highest |
Retained
tension |
Fair |
Good |
Good |
Highest |
Elongation
recovery |
High |
Fair |
Fair |
Negligible |
Heat
resistance |
Fair |
Good |
Good |
Excellent |
Humidity
resistance |
High |
High |
High |
High* |
Ease
of
disposal |
Excellent |
Excellent |
Excellent |
Fair |
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*except
for rusting |
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Application
methods |
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- Power strapping machines – the most efficient method
for strap application. Available in either automatic or semiautomatic
models.
- Hand tools – the most basic form of strap application
equipment. Suited to operations that don’t have readily
available electrical power sources.
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