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copolymer polypropylene
Mobility and Rehabilitation Service, Woodend Hospital, Aberdeen,
Scotland.
This paper compares the bending stiffness of 5 different colours
of copolymer polypropylene (CCP) with that of natural copolymer
polypropylene (NCP). Flesh coloured and natural sheets are supplied
thicker than other pigmented sheet. The bending stiffness of a
specimen may be defined as EI, i.e. the product of E, Young's
modulus of elasticity and I, the 2nd moment of area. Strips of
"as supplied" (AS) and "post-draped" (PD)
specimen were clamped and subjected to bending to assess the effect
of pigmentation on bending characteristics. The gradient of the
graph of bending deflection delta versus bending moment enables
EI to be estimated. The process of thermoforming polypropylene
reduces EI, the bending stiffness. However, the manual draping
and vacuum procedure introduces so many variables that it is difficult
to quantify the effect of pigmentation. The E of a bent specimen
may be estimated from the gradient of the graph of deltaI versus
bending moment. In the case of AS sheet, the effect of pigmentation
on E is inconclusive. PD specimens indicate a significant reduction
in E due to thermoforming. This was verified by an electron-microscope
study of AS and PD specimens. Draping an ankle-foot orthosis (AFO)
results in a non-uniform wall thickness. The results of this study
with respect to the effects of pigmentation on the bending stiffness
of AFOs are inconclusive. More detailed studies require to be
completed in order to confirm which factors are responsible for
this non-uniformity in wall thickness and consequent variation
in bending stiffness.
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