The customer required trolleys capable of handling heavy loads as part
of its manufacturing process for semiconductor lithography lenses. The
lenses are produced in a cleanroom environment, i.e. a room with a very
low level of particulates. As a result, all of the equipment and
materials used in a clean room environment have to meet special
criteria: special surfaces, antistatic, low abrasion, low maintenance,
easy to clean.
A series of airlocks removes particulates from the air all the way up
to the entrance to the cleanroom and through to the so-called
“ultra-cleanroom”, where the level of particulates in the air is
particularly low. The special cleanroom castors for the transport
trolleys can only be fitted in one of these cleanroom air locks.
As part of the production process, the trolley is guided by guide
rollers and has to pass through a U-shaped corridor. A high level of
manoeuvrability is required due to the limited space. The lens
manufacturer also requires a low mounting height, a high load capacity
and a foot guard.