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Roll Crushing:

This process is used in material recovery operations to grind brittle materials such as glass and flatten malleable materials such as metal cans and plastic bottles. This allows for subsequent separation by screening. Roll crushers were first employed for the reclamation of materials from incinerator residue and more recently are being used to process source separated recyclables, mainly glass containers and aluminum and steel cans. Once crushed this mixture can be sorted using screens and magnets, the material remaining being aluminum cans.

(McDougall F.R., White P.R., Integrated Solid Waste Management: A Life Cycle Inventory, p.232)

Hydraulic Interlock:

Hydraulic interlock devices should prevent the mold from closing when the door is open. These devices often consist of a hydraulic switch and an actuating arm. Only when the door is closed can hydraulic oil enter the mold closing cylinder.

(Richardson T. L., Lokensgard E., Industrial Plastics: Theory and Applications, p. 158)