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GB/T 25434-2025: Safety requirements of rubber and plastics calenders
Status: Valid GB/T 25434: Evolution and historical versions
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| GB/T 25434-2025 | English | 999 |
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Safety requirements of rubber and plastics calenders
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GB/T 25434-2025
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| GB 25434-2010 | English | 739 |
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Safety requirements of rubber calender and plastics calender
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GB 25434-2010
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Basic data | Standard ID | GB/T 25434-2025 (GB/T25434-2025) | | Description (Translated English) | Safety requirements of rubber and plastics calenders | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G95 | | Classification of International Standard | 71.120; 83.200 | | Word Count Estimation | 50,590 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-08-01 | | Older Standard (superseded by this standard) | GB 25434-2010 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 25434-2025: Safety requirements of rubber and plastics calenders---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25434-2025
ICS 71.120;83.200
CCSG95
National Standards of the People's Republic of China
Replaces GB 25434-2010
Safety requirements for rubber and plastic calenders
Published on 2025-08-29
Implemented on August 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of Contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and definitions, symbols and abbreviations 2
3.1 Terms and Definitions 2
3.2 Symbol 7
3.3 Abbreviations 7
4.Safety requirements and/or protective measures 7.
4.1 General Requirements 7
4.2 Control System 7
4.2.1 General Requirements 7
4.2.2 Startup 7
4.2.3 Normal Stop 7
4.2.4 Emergency Stop 8
4.2.5 Energy supply failure 8
4.2.6 Braking System 8
4.2.7 Reversal Rescue 9
4.3 Mechanical Hazard Protection 9
4.3.1 Prevent entry into the compaction zone 9
4.3.2 Additional Cleaning Requirements 16
4.3.3 Hazards arising from the transmission system 17
4.3.4 Hazards at the Auxiliary Roller 17
4.3.5 Hazards caused by auxiliary equipment 17
4.3.6 Dynamic motion of the joining/separating calender 19
4.4 Stability 20
4.4.1 Danger caused by gravity falling after roller separation 20
4.4.2 Stability of the calender 20
4.5 Electrical Hazards 20
4.5.1 Electric shock or burns caused by direct or indirect contact with live parts 20
4.5.2 Electric shock or fire caused by static electricity 20
4.6 Thermal Hazard 20
4.6.1 Burns caused by contact with hot parts or materials of the calender 20
4.6.2 Burns caused by hot fluid ejection 20
4.6.3 Infrared radiation 21
4.7 Fire protection 21
4.8 Noise Hazard 21
4.8.1 Main Noise Sources 21
4.8.2 Noise Reduction at the Source Through Design 21
4.8.3 Equipment Noise Reduction 21
4.8.4 Information related to noise hazards 21
4.9 Dangers arising from neglecting ergonomic principles 21
4.10 Dangers caused by accidental start-up 22
4.11 Hazards of slipping, tripping and falling 22
4.12 Hazards arising from the processing of materials 22
4.13 Electromagnetic Interference Hazard 22
5.Verification of safety requirements and measures 22
6.Information 25
6.1 General Requirements 25
6.2 User Manual 25
6.2.1 General Requirements 25
6.2.2 Notes related to machine design 25
6.2.3 Guidance 26
6.2.4 Noise Emissions 26
6.3 Mark 26
Appendix A (Informative) Major Hazards 28
Appendix B (Informative) Examples of Different Types of Calenders 30
Appendix C (Informative) Example 32 of Calendering Process
Appendix D (Informative) Calculation of Compaction Zone Dimension L (for rollers of equal diameter) 34
Appendix E (Informative) Fixed Protective Devices for Compacted Zones 36
Appendix F (Normative) Noise Test Procedure 37
F.1 General Rule 37
F.2 Measurement of A-weighted emitted sound pressure level at working position 37
F.2.1 Measurement Standards and Procedures 37
F.2.2 Measurement uncertainty 37
F.3 Measurement of A-weighted sound power level 37
F.3.1 Measurement Standards and Procedures 37
F.3.2 Measurement uncertainty 38
F.4 Installation and Operating Conditions 38
F.5 Information to be Recorded and Reported 38
F.5.1 General Requirements 38
F.5.2 General Data 38
F.5.3 Installation and Operating Conditions 38
F.5.4 Standard 39
F.5.5 Noise data 39
F.6 Declaration and Verification of Noise Emission Values 39
Appendix G (Informative) Approach/Entry Methods to the Machine 41
References 42
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB 25434-2010 "Safety Requirements for Rubber and Plastic Calendering Machines". Compared with GB 25434-2010, the main differences are in structural adjustments and...
Aside from editorial changes, the main technical changes are as follows.
a) The scope has been expanded to include “two-roll or three-roll extrusion calenders” (see Chapter 1);
b) Removed the hazards "fire hazard caused by flammable materials coming into contact with hot parts of the calender" and "fire hazard caused by the processed materials" from the list of hazards.
The dangers caused (see Chapter 1 and Appendix C of the.2010 edition);
c) Some terms and their definitions have been deleted (see 3.2 and 3.8 of the.2010 edition);
d) Some terms and their definitions have been added (see 3.1.11 and 3.1.12);
e) Design requirements for hydraulic equipment and its components, and pneumatic equipment and its components have been added (see 4.1);
f) The performance levels of safety-related components in the control system have been increased to comply with GB/T 16855.1-2018 (see 4.2.1);
g) The requirements for separating the braking system and the rollers have been changed (see 4.2.5, 4.2.6, 4.3.1.3~4.3.1.6, and 5.1.1.3.2 in the.2010 version);
h) The installation height requirement for the "trip arm" in the safety requirements and/or protective measures has been changed (see 4.3.1.4, 5.1.1.4.2 of the.2010 version);
i) Added requirements for "pressure-sensitive pads or pressure-sensitive flooring" as a safeguard (see 4.3.1.5);
j) Usage information has been changed (see Chapter 6, Chapter 7 in the.2010 edition).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Rubber and Plastics Machinery (SAC/TC71).
This document was drafted by. Dalian Rubber & Plastics Machinery Co., Ltd., Soft Control Co., Ltd., Tianjin Saixiang Technology Co., Ltd., and Qingdao...
Island Hailang Special Equipment Technology Co., Ltd., Suzhou Tongda Machinery Co., Ltd., Beijing Rubber Industry Research and Design Institute Co., Ltd., Dalian Plastics
Mechanical Research Institute, National Plastics Machinery Product Quality Supervision and Inspection Center.
The main drafters of this document are. Zhang Zhaoqing, Yang Youren, Guan Bingzheng, Zhang Xiaochen, Hu Linlin, Xu Wenliang, He Cheng, Wang Gengxin, Sun Ning, and Zheng Ji.
The release history of this document and the document it replaces is as follows.
---First published in.2010 as GB 25434-2010;
---This is the first revision.
introduction
According to the classification of GB/T 15706, this document belongs to Class C standards.
This document is particularly relevant to the following stakeholders related to machinery safety.
---Machine manufacturer,
---Health and Safety Agency.
Other stakeholders affected by the level of mechanical safety include.
---Machine users,
---Machine owner,
---Service provider,
---Consumer (when the machine is scheduled to be used by the consumer).
All of the aforementioned stakeholders may participate in the drafting of this document.
The scope of the machinery involved, as well as the hazards, hazardous conditions, and hazardous events covered, is given in the scope of this document.
When the requirements of this document differ from those in Category A or Category B standards, for machines designed and manufactured in accordance with this document,
The requirements in this document take precedence over those in other standards.
Safety requirements for rubber and plastic calenders
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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