GB/T 25434-2025Safety requirements of rubber and plastics calenders (English PDF)

1 Scope

This document specifies the safety requirements for the design and manufacture of calenders used for calendering, polishing, laminating, or embossing rubber or plastics.

This document applies to rubber and plastic calenders, two-roll or three-roll extrusion calenders, including cutting devices, feeding devices, and auxiliary components.

Integrated components such as rollers.

This document applies to the entire lifecycle of the calender (see section 5.4 of GB/T 15706-2012), during the intended use, with...

And all significant hazards, dangerous conditions, and risks related to the calender that may arise from misuse that the manufacturer could reasonably foresee.

Hazardous events (see Appendix A).

This document does not cover the following dangers.

---Hazards arising from processing explosive materials or materials that can produce explosive gases;

---Dangers caused by lasers or ionizing radiation;

---Dangers caused by the installation of calenders in potentially explosive environments.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1251.1 Ergonomic Hazard Signals in Public Places and Work Areas. Auditory Hazard Signals

GB/T 3766 General rules and safety requirements for hydraulic transmission systems and their components

GB/T 3767 Engineering method for determining the sound power level and sound energy level of a noise source using acoustic pressure method in an approximately free field above a reflecting surface.

GB/T 3768 Acoustic sound pressure method for determining the sound power level and sound energy level of a noise source using a simplified measurement method based on the envelope above the reflecting surface.

Easy Method

GB/T 5226.1-2019 Electrical Safety of Machinery - Electrical Equipment of Machinery - Part 1.General Technical Conditions

GB/T 7932 General rules and safety requirements for pneumatic systems and their components

GB/T 8196-2018 General requirements for the design and manufacture of fixed and movable protective devices for mechanical safety.

GB/T 12265-2021 Minimum Spacing for Preventing Crushing of Human Body Parts in Mechanical Safety

GB/T 14048.20-2013 Low-voltage switchgear and controlgear - Part 5-8.Control circuit devices and switching elements (three-position)

Enable switch

GB/T 14574 Marking and verification of noise emission values of acoustic machines and equipment

GB/T 15706-2012 General Principles for Safety Design of Machinery. Risk Assessment and Risk Reduction

GB/T 16404.2 Acoustic intensity method for determining the sound power level of noise sources - Part 2.Scanning measurement

GB/T 16538 Acoustic pressure method for determining the sound power level of a noise source - on-site comparison method

GB/T 16754 Design Principles for Emergency Stop Functions in Mechanical Safety

GB/T 16855.1-2018 Safety-related components of mechanical safety control systems - Part 1.General design principles

GB/T 17248.2 Approximate free noise emitted by acoustic machines and equipment with negligible environmental correction above a reflecting surface.

Field measurement of emitted sound pressure levels at the working location and other designated locations

GB/T 17248.3 Noise emitted by acoustic machines and equipment shall be determined using approximate environmental correction at the working position and other specified locations.

The emitted sound pressure level

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