Plastic Compression Moulding for Complex Holed Objects

The mould is divided into two separate half-moulds that can move independently relative to each other. The first half-mould remains stationary while the second half-mould moves along the longitudinal axis. This segmentation allows the mould to accommodate complex geometries including holes and multiple cavities while maintaining the simplicity of compression moulding, as each half-mould can be designed to form specific portions of the complex object.

The second half-mould moves towards the first half-mould along the longitudinal axis before the plunger fully occupies the recess. This preliminary movement creates the moulding space in advance, allowing the plastic material to be forced into the holes and cavities first. Only after the material has properly filled these features does the plunger complete its occupation of the recess, preventing unwanted material films from forming.

The second half-mould is made movable along the longitudinal axis relative to the stationary first half-mould. This dynamic configuration allows the mould to adapt its volume during the moulding process - the half-moulds can move closer together to reduce moulding space volume as the plunger occupies the recess. This dynamic adjustment ensures reliable mould closing and proper material containment without requiring complex synchronised movement mechanisms, as the movement is achieved through the inherent mobility of the second half-mould.