THE handling of moulded plastic parts is becoming more and more an application where vacuum technology and robots are dominating the safe handling of parts from injection moulding machines.
In most cases vacuum grippers made from silicone materials are preferred for the handling of high-quality injection-moulded or thermoformed parts and liners made of plastic or with plastic surfaces.
Silicone materials are in such cases better than the more robust NBR or Perbunan suction pads, because they are softer and thus adapt themselves better to the shape of the workpiece surface. They can also withstand higher temperatures.
Since sensitive parts, such as displays, or parts which are to be painted for a better finish must be completely free of marks and of substances which interfere with wetting (LABS), very special suction pads are necessary in these cases.
For this reason, the vacuum specialists at J. Schmalz GmbH and Millsom Hoists , have extended their range of suction pads with a group of special plastic suction pads which leave practically no marks on the parts being handled.
These suction pads are made from the special material HT1, which can withstand temperatures of up to 160°C, leave almost no marks, and are free of LABS and silicone.
The particular suitability of these HT1 suction pads for the handling of plastic parts has been proved in practically oriented experiments, in which the new suction pads easily achieved the classifications 0 and 1.
Class 0 means "absolutely no marking", in other words, that no marks are visible even when steam condenses on a mirror-finish surface which has been handled with the suction pads.
Class 1 stands for "no marking" and means that no marks are visible on the surfaces of mirrors or Ceran surfaces which have been handled, but without the application of steam.
This make the HT1 the best choice material for handling moulded plastic parts, especially when parts are to be painted after being moulded.