© Rolf Diederichs
Strict safety regulations demand extensive wall thickness measurement
on plastic containers for dangerous goods and automotive gasoline
tanks. At the same time increasing costs pressures are calling
for rationalization efforts. Automated ultrasonic wall thickness
measurement within the blow mould (IMM) is opening up new possibilities
for meeting both requirements. In addition, it offers ideal preconditions
for improved control of the blow moulding progress, and the possibility
of optimizing the wall thickness. Details of the ultrasonic method
with regard to coupling and transmission of ultrasonic signals
temperatures and the digital evaluation of the measurement signal,
are here described. A multi channel system , PC-based and thus
with many features, makes the method user friendly and efficient.
Initially the IMM blow mould application was applied . Later it was also applied to the thermoforming
process, and gas-assist injection process method.
This article revues already published articles [References] and allows new readers access to this, in my opinion it is excellent method. The method was investigated 1979 by the institute of plastic IKV Aachen [Bergweiler E.] investigated, and a first commercialization started in 1988. This was improved in 1991[Diederichs R.] with a new PC-based multi channel system, thus the method spread. Despit this it's still not widely used but perhaps through the Internet readers it will become more popular.
Herford, 13. Dec.1995 © Rolf Diederichs, Email: dieder@echo.teuto.de
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