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Production of large high-tension insulators made of liquid silicone
Solutions from the process technology
Depending on the voltage level, high-tension insulators are often several
metres long. They are typically produced through injection moulding in a
step-by-step procedure. The larger the number of steps, the higher the total
cycle time. When transferring the insulators manually, the risk of more reject
is given as a result of an operating error.
On the basis of a D 968.560 ZO BENCHMARK 750, DESMA therefore developed a
special machine which, with mould carrier platens lengthened to 1,700 mm,
allows the injection of up to 1,500 mm-long articles in one piece. This way,
the number of steps could be more than halved.
In addition, the machine was equipped with a special injection unit which enables a
maximum injection volume of 11,000 cm³ and which is with 1,000 bar sufficiently
dimensioned for the liquid silicone application.
Compared to standard injection units for customary elastomers, considerable
cost advantages can be realized. The injection mould with quickly
exchangeable inserts was developed and manufactured in the DESMA mould shop.
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