Overview
EN ISO 23771:2015 - Textile machinery: Guide to the design of textile machinery for reduction of the noise emissions (ISO 23771:2015) provides technical guidance for designing low-noise textile machines. It supports designers and manufacturers in identifying significant noise sources, applying effective noise control measures and verifying results. The standard targets textile machines that may present a significant noise hazard (see ISO 11111); a noise hazard is defined in ISO 23771 as an A-weighted emission sound pressure level at an operating position higher than 70 dB(A) (with probable real-world values ≥ 80 dB(A)).
Key Topics
- Noise measurement and detection
- Measurement per ISO 9902 (all parts) to detect emission levels and determine if further action is required.
- Identification of significant noise sources
- Recommended methods: analysis of rotating speeds and dominant frequencies, comparative measurements under varying parameters, sound intensity mapping, and structure-borne noise calculation/simulation.
- Noise control strategy and hierarchy
- Preferred order of measures:
- Reduce sound generation at the source
- Reduce sound propagation (enclosures, barriers, damping)
- Design for reliable installation, maintenance and spare parts to ensure sustained low-noise operation
- Use of hearing protection where necessary
- Verification of effectiveness
- Re-measurement and verification (ISO 9902) and documentation for machine handbooks.
- Machine categories covered
- Spinning and spinning preparatory machines, non-woven machinery, yarn processing, cordage/rope manufacture, weaving and knitting preparatory machinery, fabric manufacturing, dyeing and finishing machines - sources and specific control measures are described by machine type.
- Scope limits
- Elements not part of the textile machine itself (e.g., material transport systems, external media supplies) are excluded.
Applications
Who uses ISO 23771:2015:
- Machine designers and OEMs developing low-noise textile equipment
- Acoustic engineers and consultants performing noise audits and mitigation design
- Safety and compliance officers ensuring conformity with machinery safety and noise limits
- Procurement and plant managers specifying low-noise equipment for production lines
Practical benefits include reduced worker exposure, improved compliance with occupational noise requirements, and better marketability of quieter textile machinery.
Related Standards
- ISO 9902 (all parts) - Textile machinery - Noise test code
- ISO/TR 11688-1 / ISO/TR 11688-2 - Recommended practice for low-noise machinery design
- ISO 11689 - Procedure for comparing noise-emission data
- ISO 12100 - Safety of machinery - Risk assessment and risk reduction
- ISO 11111 (all parts) - Definition of textile machines with significant noise hazard
Keywords: ISO 23771:2015, textile machinery, noise emissions, low-noise design, noise control measures, significant noise hazard, ISO 9902, acoustic design.
