BS EN ISO 20430:2020 pdf download.Plastics and rubber machines — Injection
moulding machines — Safety requirements.
4.3 Clamping mechanism area or area behind the movable platen 4.3.1 Basic safety requirements Access to hazardous movements in the clamping mechanism area or to the area behind the movable platen shall be prevented by one of the following devices: a) interlocking guards. Opening the interlocking guards shall: — interrupt all movements of the platen and the clamping mechanism in accordance with Protective Type II or PL r = d; and — interrupt the opening movement of the power-operated guard for the mould area in accordance with Protective Type I or PL r = c, if there is a hazard for any person accessing from the guard for the clamping mechanism area; b) light curtains for the mould area, appropriately extended in a way to cover the clamping mechanism area. An interruption of the light curtain shall stop these movements in accordance with PL r = d; c) fixed guards, if access is required only for machine repair or maintenance. Access to the area of hazardous movements of the core and ejector drive mechanisms shall be prevented by interlocking guards in accordance with Protective Type I or PL r = c or by fixed guards. NOTE Access to the area of hazardous movements of the core and ejector drive mechanisms can be prevented by the guards for the clamping mechanism area described above. When the guards for the mould area are open, or the light curtains are interrupted, or a manual actuator of any two-hand control devices are released, an opening movement of the platen shall only be possible if access to crushing and/or shearing points behind the movable platen is prevented.
4.3.2 Additional safety requirements for machines with an upstroking platen On upstroking injection moulding machines, shearing or crushing hazards below the movable platen shall be prevented by a restraint device (e.g. non-return valve/check valve, brake): — when they are due to unintentional gravity descent of that platen during setting the strokes for the cores and ejectors; or — when it is possible to gain access under the movable platen during production. The restraint device shall be: — activated when the guards for the clamping mechanism area have been opened or the light curtains have been interrupted or a manual actuator of any two-hand control devices have been released; and — effective over the complete hazardous stroke of the platen; and — able to hold the maximum total weight of the mould fixed on the upstroking platen as specified by the manufacturer (see 6.2.9). For repair or maintenance operations on machines where a mechanical restraint device is not installed, the machine shall be designed so that: — the movable platen can be blocked by a mechanical device; or — it is possible to move the platen to a position where further unintentional movement by gravity is impossible. See also 6.2.11.BS EN ISO 20430 pdf download.