Coefficient of Friction
| Sample Type | Required Quantity | Equipment Used |
| Bottles | 10 |
Instron COF Fixture |
Purpose
This procedure determines the coefficient of friction between two PET
film samples using an adapted version of ASTM D1894-90.
Description
Bottle samples are prepared and handled with gloves during both
injection and blow molding to prevent contamination that might affect
the COF results. The bottle sidewalls are cut from the bottle and one
sidewall is mounted to a metal sled while the other sidewall is mounted
to a flat plane. The COF assembly is then attached to the Instron
machine and the force required to move the sled across the plane is
measured using the 10lb load cell. The data is plotted as force (lbs)
vs. the sled travel (in.) and is typically reported graphically. Our
typical test usually results in a series of static COF values rather
than an initial static value followed by a kinetic value; this is
because our samples usually "jump" across the sidewalls rather than pull
uniformly. The COF value is calculated by dividing the measured force
by the weight of the sled.
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