Friction Testing
Surface slip is a key factor when printing or filling packaging materials on an automated line. If the friction of a material is too high then the film may too ‘tacky’ for the process, too low and the film may be too ‘slippy’ for the process. Optimising friction parameters can help understand how the finish of a blown film can influence the feeding and running speed.
There are 2 types of coefficient of friction measured in plastic films.• Static Friction
The initial force required to make two surfaces slip against each other
• Dynamic or kinetic friction
The ongoing force required to maintain movement between two surfaces
It is therefore essential that both static and dynamic friction be accurately controlled.
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Test System:
When using a dedicated friction testing instrument,this will typically be a horizontal plane device with a sled driven by a linear drive system and a precision load cell.
A sample of film 63.5mm2 is wrapped around a metal block with a uniform weight of 200g acting over the surface area and run over another sample of the same material. Typical test speed is 150 mm/min and test distance of 120mm+
An automated sled placement system with configurable dwell time may provide more repeatable static friction results.
User Type
QC testing of production batches
R & D of new materials
Incoming material inspection
Applications – all types of films including:
- Lamination films
- Barrier films
- PE films
- Self-adhesive labels
- HDPE films
- LLDPE films
- Shrink Film
- PP Films
Applicable Standards
ASTM D1894
ISO 8295
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