GB/T 25431.2-2025 English PDFUS$439.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25431.2-2025: Extruders and extrusion lines of rubber and plastics - Part 2: Safety requirements for die face pelletizers Status: Valid GB/T 25431.2: Historical versions
Basic dataStandard ID: GB/T 25431.2-2025 (GB/T25431.2-2025)Description (Translated English): Extruders and extrusion lines of rubber and plastics - Part 2: Safety requirements for die face pelletizers Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G95 Classification of International Standard: 71.120; 83.200 Word Count Estimation: 22,238 Date of Issue: 2025-08-29 Date of Implementation: 2026-08-01 Older Standard (superseded by this standard): GB 25431.2-2010 Issuing agency(ies): State Administration for Market Regulation; Standardization Administration of China GB/T 25431.2-2025: Extruders and extrusion lines of rubber and plastics - Part 2: Safety requirements for die face pelletizers---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/GBT25431.2-2025 ICS 71.120;83.200 CCSG95 National Standards of the People's Republic of China Replaces GB 25431.2-2010 Rubber and plastic extruders and extrusion production lines Part 2.Safety Requirements for Die-face Pelletizers 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 ContentsPreface III Introduction IV 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 4.Safety requirements and/or risk reduction measures 7. 4.1 General Rules 7 4.2 Mechanical Hazards 7 4.3 Dangers caused by loss of stability 8 4.4 Electrical Hazards and Electromagnetic Interference Hazards 8 4.5 Hazards arising from hydraulic and pneumatic systems 9 4.6 Hazards arising from malfunctions of safety-related components in the control system 9 4.7 Thermal Hazards 9 4.8 Noise Hazard 10 4.9 Hazards arising from the processing, use, or discharge of materials and substances 10 5.Verification of safety requirements and/or risk reduction measures 11 6.Information on usage 11 6.1 Markings and Signs 11 6.2 Instruction Manual 12 Appendix A (Informative) Major Hazards 13 Appendix B (Normative) Noise Test Procedure 15ForewordThis 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 2 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 25431.2-2010 "Rubber and Plastic Extruders and Extrusion Lines - Part 2.Safety Requirements for Die Cutting Machines". Compared with GB 25431.2-2010, the main technical changes in the "Requirements" standard, apart from structural adjustments and editorial modifications, are as follows. a) The scope has been changed (see Chapter 1, Chapter 1 of the.2010 edition); b) The definition of the term "die pelletizer" has been changed (see 3.1,.2010 edition of 3.1); c) The definitions of the terms "underwater pelletizer," "water ring pelletizer," "roller pelletizer," and "start valve" have been changed (see 3.1.1, 3.1.2, 3.1.5). 3.4 (3.2, 3.3, 3.6, and 3.9 of the.2010 edition); d) Chapter 4, Hazards and Hazardous Areas, has been removed from the.2010 edition. Major hazards are listed in tabular form in Appendix A (see.2010 edition). Chapter 4 of the edition); e) A "General Rule" has been added (see 4.1); f) The safety requirements for safety-related components of the control system have been changed, replacing "Category" with "Required Performance Level PLr" (see [link]). 4.6.1 (5.5.1 in the.2010 version); g) Detailed provisions have been added regarding safety requirements and protective measures for electrical hazards (see 4.4); h) Noise requirements have been changed (see 4.8, 5.7 in the.2010 version); i) The "Reference Standards" section has been removed (see Table 1, Chapter 6 of the.2010 edition); j) Added the necessary permanent markings to the machine (see 6.1); k) A noise testing procedure 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. Dalian Rubber & Plastics Machinery Co., Ltd., Zhejiang Baina Rubber & Plastics Equipment Co., Ltd., and Wuxi Jiangnan Rubber & Plastics Machinery Co., Ltd. Limited Liability Company, Qingdao University of Science and Technology, Nanjing Keya Chemical Complete Equipment Co., Ltd., Jiangsu Yuesheng Technology Co., Ltd., Beijing Rubber Industry Research and Design Institute Co., Ltd., Dalian Plastics Machinery Research Institute, and National Plastics Machinery Product Quality Supervision and Inspection Center. The main drafters of this document are. Yang Youren, He Guihong, Xiang Junwei, Zhang Hua, Wang Chuansheng, Liu Hongtao, Du Hui, He Cheng, Wang Gengxin, and Li Xianglan. Zheng Ji. The release history of this document and the document it replaces is as follows. ---First published in.2010 as GB 25431.2-2010; ---This is the first revision.introductionThe 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 of this document take precedence over the requirements of other standards. Rubber and plastic extruders and extrusion production lines Part 2.Safety Requirements for Die-face Pelletizers 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 referencesThe 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. Simplified method 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. 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