GB/T 25431.1-2025Extruders and extrusion lines of rubber and plastics — Part 1: Safety requirements for extruders (English PDF)

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 is Part 1 of GB/T 25431 "Rubber and Plastics Extruders and Extrusion Lines". GB/T 25431 has been published as follows. Part 2.

— Part 1: Safety Requirements for Extruders;

— Part 2: Safety Requirements for Die-face Pelletizers;

— Part 3: Safety requirements for traction devices.

This document replaces GB 25431.1-2010 "Rubber and Plastics Extruders and Extrusion Lines - Part 1: Safety Requirements for Extruders".

Compared with GB 25431.1-2010, the main technical changes in the "Requirements" standard, apart from structural adjustments and editorial modifications, are as follows.

— The scope of application of this document has been changed to include rubber and plastic screw extruders (see Chapter 1, 2010 edition). Chapter 1);

— The term "shear head assembly" and its definition have been removed (see 3.17 of the 2010 edition);

— The term "hopper" and its definition have been added (see 3.4);

— The term "extruder" has been changed to "(screw) extruder," and the definition has been revised (see 3.1, 2010 edition). The terminology has also been changed.

Definitions of "extruder", "main feed port", "auxiliary feed port", "barrel", "venting device", "pin", "static mixer" and "screen changing device" (See 3.8, 3.9, 3.10, 3.11, 3.12, 3.16 and 3.17, and 3.7, 3.8, 3.9, 3.10, 3.11, 3.15 and 3.16 of the 2010 edition);

— The term "single-roller feeder" has been changed to "single-roller feeder system," and the definition has been revised (see 3.5, 3.6 of the 2010 edition);

— The term "twin-roller feeder" has been changed to "twin-roller feeder system," and the definition has been revised (see 3.6, 3.5 of the 2010 edition);

— The term "accessory to the feed port on the extruder barrel" has been changed to "accessory at the opening of the extruder barrel," and the definition has been changed (see [link]).

3.13 (3.12 in the 2010 edition)

— The term "melt/gear pump" has been changed to "melt gear pump," and the definition has been revised (see 3.14, 3.13 of the 2010 edition);

— The term "melt connector" has been changed to "melt piping and melt connector," and the definition has been revised (see 3.15, 2010 edition). 3.14);

— The term "die head" has been changed to "extrusion die head," and the definition has been revised (see 3.18, 2010 edition of 3.18);

— Chapter 4, "Dangers and Dangerous Areas," has been deleted. Dangerous areas and major hazards are listed in Appendix A (see Appendix A, 2010 edition). Chapter 4);

— A "General Rule" has been added (see 4.1);

— The safety requirements for safety-related components of the control system have been changed, replacing "Category" with "Required Performance Level PLr" (see [link]). 4.2 (5.1 in the 2010 edition)

— The requirements for the fixed and interlocking protective devices used have been changed to "comply with the relevant clauses in GB/T 15706".

The phrase "specifies" has been changed to "complies with the provisions of GB/T 8196" (see 4.2, 5.1 of the 2010 edition).

— The requirements for "accessory openings for auxiliary components" and "vents" have been removed, and the requirement for "openings for mounting auxiliary components" has been added, and more...

The requirements for "exhaust devices" have been revised (see 4.2.3.3 and 4.2.10, and 5.1.3.3, 5.1.3.4 and 5.1.10 in the 2010 edition);

— The term "bucket feeding system" has been changed to "bucket," and the corresponding technical details have been modified (see 4.2.4.1, 5.1.4.1 in the 2010 version);

— The requirements for "stuffing feeding systems" have been changed (see 4.2.4.4, 5.1.4.4 in the 2010 version);

— The requirements for "overvoltage protection" have been changed (see 4.2.5, 5.1.5 in the 2010 version);

— The requirements for "network switching devices" have been changed (see 4.2.6, 5.1.6 in the 2010 version);

— The requirement for "shear head assembly" has been removed (see 5.1.11 in the 2010 version);

— The requirements for "extruder head" have been changed (see 4.2.11, 5.1.12 in the 2010 version);

— Changed "High-altitude work location" to "High-level work platform" and modified the corresponding technical details (see 4.8, 2010 version). 5.1.13);

— Change "power-controlled horizontal movement of the whole machine and its components" to "power-controlled horizontal movement of the whole machine and its components", and further...

The corresponding technical requirements have been revised (see 4.2.12, 5.1.14 in the 2010 version);

— Changed "Electrical Hazard" to "Electrical Hazard and Electromagnetic Interference Hazard" and modified the corresponding technical content (see 4.3, 2010). Version 5.2);

— The phrase "hot machine parts and thermoplastic materials" has been changed to "thermal hazards," and the corresponding technical details have been revised (see 4.4, 2010 edition). (5.3)

— The requirements for "noise" have been changed (see 4.5, 5.4 in the 2010 edition);

— Change "materials and substances that are machined, used, or discharged" to "materials and substances that are processed, used, or discharged", and change the following.

The relevant technical details are shown in section 4.6, section 5.5 of the 2010 edition.

— The terms "fire" and "temperature control of the heating zone" have been merged and changed to "fire hazard," and the corresponding technical details have been modified (see 4.7, 2010).

(5.6 and 5.7 of the 2016 edition);

— The requirement of "ergonomics" has been added (see 4.9);

— The term "emergency stop device" was changed to "emergency stop," and the corresponding technical details were modified (see 4.10, 5.8 of the 2010 version);

— The phrase "mechanical control system" has been removed (see section 5.9 of the 2010 edition);

— Change "Conformity verification of safety requirements and measures" to "Conformity verification of safety requirements and/or protection/risk reduction measures" (See Chapter 5, Chapter 6 in the 2010 edition);

— Changed "minimum markings required on the machine" to "markings and signs," and modified the corresponding technical content (see 6.1, 2010). Version 7.1);

— Added content on keeping the machine clean and ergonomics to the instruction manual [see 6.2m) and 6.2n];

— Appendix A, which provides a comparison of relevant standards cited, has been deleted (see Appendix A in the 2010 edition).

— Appendix B, "Noise Testing Procedures," has been added (see Appendix B).

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: National Plastics Machinery Product Quality Supervision and Inspection Center, Guilin Rubber Design Institute Co., Ltd., and Dalian Rubber & Plastics.

Machinery Co., Ltd., Tianhua Chemical Machinery & Automation Research and Design Institute Co., Ltd., Guangdong Shicheng Plastic Machinery Co., Ltd., Jiangsu Beier Machinery Machinery Co., Ltd., Yiyang Rubber & Plastics Machinery Group Co., Ltd., Soft Control Co., Ltd., Ningbo Fangli Technology Co., Ltd., Shaoxing Precision Machinery Co., Ltd.

Xiang Machinery Manufacturing Co., Ltd., Wuxi Jiangnan Rubber & Plastic Machinery Co., Ltd., Kingway Machinery (Haining) Co., Ltd., Tianjin Saixiang Technology Co., Ltd.

Limited Liability Company, Shandong Tongjia Machinery Co., Ltd., Zhangjiagang Huaming Machinery Co., Ltd., Qingdao University of Science and Technology, Nanjing Keya Chemical Complete Equipment Co., Ltd.

The company, Hefei Lihong Plastic Materials Co., Ltd., Jiangsu Yuesheng Technology Co., Ltd., Shenzhen Suengneng Energy-Saving Equipment Co., Ltd., Wuyi Da Xue, Xinle Huabao Plastic Machinery Co., Ltd., Shaoxing Naite Plastics Co., Ltd., Beijing Rubber Industry Research and Design Institute Co., Ltd., Guangdong Hanjiang Light Industry Machinery Co., Ltd.

The main drafters of this document are: Zheng Ji, Ma Xiaogang, Chen Yilin, Yang Hong, Yu Changgeng, Zhang Chunhua, Jiang Wei, Peng Zhishen, Yang Huili, and Wang Shangfeng.

Xu Yongfeng, Zhang Hua, Lou Yijian, Zhang Xiaochen, Li Yong, Chen Gang, Wang Chuansheng, Liu Hongtao, Zhang Wendong, Du Hui, Xun Shanglun, Xu Baiping, Bai Yunliang, Teng Guomin He Cheng, Wang Gengxin, Bai Rujia, Ou Anlin, Huang Hong.

The release history of this document and the document it replaces is as follows.

— First published in 2010 as GB 25431.1-2010;

— This is the first revision.

Introduction

The safety standard system in the mechanical field consists of the following categories of standards.

— Class A standards (basic safety standards) provide basic concepts, design principles, and general characteristics applicable to all machinery.

— Class B standards (general safety standards) refer to a type of safety device that relates to a specific safety feature of machinery or has a wide range of applications.

- Category B1, safety characteristic standards (such as safety distance, surface temperature, noise);

- Class B2, safety device (such as two-hand operating device, interlocking device, pressure-sensitive device, protective device) standard.

— Class C standards (machinery product safety standards) are standards that specify detailed safety requirements for a particular machine or a group of machines.

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...

For this instrument, the requirements in this document take precedence over the requirements in other standards.

Rubber and plastic extruders and extrusion production lines Part 1: Safety Requirements for Extruders

1 Scope

This document specifies the safety requirements for the design and manufacture of all types of rubber and plastic screw extruders.

This document applies to the entire lifecycle of the extruder (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 extruder that may arise from misuse that the manufacturer could reasonably foresee.

Hazardous events (see Appendix A).

This document also covers the following feeding systems.

— hopper;

— Single roller feeding system;

— Double roller feeding system;

— Package feeding system.

And the following auxiliary equipment.

— Network switching device;

— Mel gear pump;

— Melt piping and melt connectors;

— Static mixer;

— Exhaust system;

— Extruder head.

This document does not include.

— The material processing process may pose a risk of explosion;

— Requirements for equipment and protective systems used in potentially explosive atmospheres;

— Design requirements for exhaust ventilation systems.

2 Normative references

GB/T 3766

GB/T 3767-2016

GB/T 3768-2017

GB/T 4208-2017

GB/T 5226.1-2019

GB/T 8196

GB/T 12265