In a plastic injection moulding machine (1) with a mould closing unit, the backing plate and the movable closure plate (6, 9) are arranged in an in particular C-shaped frame (3). In order to improve the parallelism between the plates, so that the deformation caused when the closure force is applied may be eliminated as an influencing variable, the machine frame (3) is provided with an overhanging active compensation element (4) with the guide (5) for the closure plate (6).
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