Distinguish the loading arrangement
Some machines use individual sheets, while others receive material from a roll or an extruder. This changes access routes and operator tasks. A guarding solution should not be copied without checking that it addresses the actual process.
Rolls and moulds may require mechanical handling aids. Assessment covers their stability, lifting accessory capacity and trapping points during positioning. Sheet threading needs a planned method that does not depend on bringing hands close to moving rollers or chains.
Forming and trimming: movement and gravity
Platens, tables, frames and heads can create crushing hazards. Interlocking devices must respond consistently with the movements they protect, including discharge and stacking access. Hands must not be inserted between cycles to recover a part.
Raised components may descend when pressure or power is lost. Electrical stopping does not eliminate this hazard. Intervention requires designed means of preventing descent and releasing or controlling stored energy, without improvised supports. These precautions must match the component’s actual movement and load.
Heat, sheet and scrap
Heaters, moulds and newly formed material can cause burns. Heater response to a stop, and the possibility of sheet remaining in a heated zone, must be addressed by machine design and the operating procedure.
Trimming adds blades and sharp edges, while scrap handling may involve winders or granulators. Those units need their own safeguards and coordination with the installation. Thermal processing emissions also require assessment to determine necessary Ventilation and local exhaust ventilation and other controls.
Format changes and process faults
A new geometry can change access to parts, gaps around guards or stacking behaviour. Review the installation and verify safeguarding for the intended format before production starts. Mould changes require a specific procedure, using Lockout/Tagout (LOTO) where appropriate to the intervention.
Recording distorted parts, jams and collection failures helps resolve their causes. Training should distinguish faults an operator can address from outside the enclosure from those needing authorised intervention. A process incident must not turn opening guards into routine work. Supervisors should ensure that recurring failures are corrected rather than managed through repeated unsafe access.
