GB/T 25431.2-2025Extruders and extrusion lines of rubber and plastics - Part 2: Safety requirements for die face pelletizers (English PDF)

1 Scope

This document specifies the following safety requirements for the design and manufacture of die-face pelletizers.

---Underwater pelletizer;

---Water ring pelletizer;

---Dry pelletizer;

---Centrifugal pelletizer;

---Roller pelletizer.

This document applies to the entire lifecycle of the die-cutting pelletizer (see section 5.4 of GB/T 15706-2012), during the intended usage process.

In addition, all significant hazards and dangers related to the die-cutting pelletizer that may arise from misuse that the manufacturer could reasonably foresee.

Hazardous conditions and dangerous events (see Appendix A).

This document does not apply to strip pelletizers.

This document does not include design requirements for exhaust ventilation systems.

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 3766-2015 General rules and safety requirements for hydraulic transmission systems and their components

GB/T 3767-2016 Acoustic pressure method for determining the sound power level and sound energy level of a noise source in an approximately free field above a reflecting surface.

Cheng Fa

GB/T 3768-2017 Acoustic sound pressure method for determining the sound power level and sound energy level of a noise source using the envelope measurement surface above the reflecting surface.

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GB/T 4208-2017 Degrees of protection provided by enclosures (IP code)

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

GB/T 7932-2017 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 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 16754-2021 Design Principles for Emergency Stop Functions in Mechanical Safety

GB/T 16855.1-2025 Mechanical Safety - Safety Control Systems - Part 1.General Design Principles

GB/T 17248.2-2018 Noise emitted by acoustic machines and equipment with negligible environmental correction above a reflecting surface

The emitted sound pressure level at the working position and other specified positions in the pseudo-free field measurement

GB/T 17248.3-2018 Noise emitted by acoustic machines and equipment - Determination of noise using approximate environmental corrections for working position and other factors.

Emitted sound pressure level at a specified location

GB/T 45132 | GB/T 25156 | GB/T 32662 | GB/T 25431.3 | GB/T 25431.1 | GB 25431.3 | […]