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Extrusion International 1/2017
MEASUREMENT
Technologies
for the measurement
Manufacturer of hoses and
tubes have been investing
intensively in measuring and
control technology as well as
line control over the last years,
aiming for an online quality
control, process stability and
cost
reduction.
Nowadays,
online
measuring
devices
with a connected control are
a standard for extrusion lines.
Used test devices include,
amongst others, gauge heads
that measure the inner and
outer diameter, the ovality,
eccentricity as well as ideally the
sagging (“sagging” of the melt
during the solidification at a too
high viscosity) of the product
during the extrusion process.
The used measuring systems are
based on varied technologies
for different application areas.
The following article provides
an overview of conventional as
well as innovative measuring
technologies and discusses the
advantages and limits of their
usage in extrusion lines.
of the diameter, wall thickness, eccentricity and sagging
during the hose and tube extrusion