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Safety requirements of mill for rubber and plastics
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Basic data | Standard ID | GB/T 20055-2025 (GB/T20055-2025) | | Description (Translated English) | Safety requirements of mill for rubber and plastics | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G95 | | Classification of International Standard | 71.120; 83.200 | | Word Count Estimation | 34,379 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-08-01 | | Older Standard (superseded by this standard) | GB 20055-2006 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 20055-2025: Safety requirements of mill for rubber and plastics---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/GBT20055-2025
ICS 71.120;83.200
CCSG95
National Standards of the People's Republic of China
Replaces GB.20055-2006
Safety requirements for open-type rubber mixing mills and plasticizing mills
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 2
4.Safety Requirements and/or Protective Measures
4.1 General Requirements 4
4.2 Mechanical Hazards 5
4.3 Electrical Hazards and Electromagnetic Interference Hazards 13
4.4 Thermal Hazard 13
4.5 Hazards posed by gases, dust, or vapors harmful to health 14
4.6 Dangers arising from neglecting ergonomic principles 14
4.7 Noise Hazard 14
5.Verification of safety requirements and/or measures 14
6.Usage Information 16
6.1 General Requirements 16
6.2 Instruction Manual 16
6.3 Markings and Signs 17
Appendix A (Informative) Major Hazards 18
The positioning of the parking device as specified in Appendix B (Normative) 4.2.3.3.2 and 4.2.4 21
B.1 Schematic diagram of parking device 21
B.2 Parameter Description 22
B.3 Parking device installation location requirements 22
B.4 Calculate 22
B.5 Calculation Result 23
Appendix C (Normative) Noise Test Procedure 25
C.1 General Rule 25
C.2 Measure the A-weighted emitted sound pressure level at the working position.
C.3 Measurement of A-weighted sound power level 26
C.4 Installation and Operating Conditions 26
C.5 Information that needs to be recorded and reported 26
C.6 Declaration and Verification of Noise Emission Values 27
References 28
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.20055-2006 "Safety Requirements for Open-Type Rubber Mixing Mills and Plasticizing Mills". Compared with GB.20055-2006, the only differences are in the structural design.
Aside from integration and editorial changes, the main technical changes are as follows.
a) The description of "scope" has been changed (see Chapter 1, Chapter 1 of the.2006 edition);
b) The terms "large open mill," "small open mill," and "medium open mill" and their definitions have been added (see 3.2-3.4);
c) The terms and definitions for “parking angle,” “safety limit,” and “baffle” have been changed (see 3.6–3.8, 3.3–3.5 in the.2006 edition);
d) Performance level specifications for relevant safety components of the control system have been added (see 4.1.1 and 4.2);
e) Added general requirements regarding emergency stops (see 4.1.2);
f) The requirement for detecting the working position of the baffle plate has been added (see 4.2.1.4);
g) Additional safety requirements for emergency personnel release have been added (see 4.2.1.5);
h) Safety requirements and protective measures have been changed for large (D≥400mm), small (D≤200mm), and medium (200mm< D) vehicles.
The 400mm open mill was differentiated (see 4.2.2~4.2.4, Chapter 5 of the.2006 edition);
i) The distance between safety bar A and the ground where the operator is standing has been changed; the requirement that the force required to drive the safety bar should be no less than 25N has been removed.
Requirements (see 4.2.2.1.3, 5.1.1.1.7 of the.2006 edition);
j) A separate manual reset button for the safety bar has been added (see 4.2.2.1.4);
k) The actions and automatic reversal angle of the emergency stop device after activation have been changed, and an automatic disengagement requirement has been added (see 4.2.2.1.5,.2006 edition).
(5.1.1.1.8)
l) The requirement for open mill noise levels has been removed (see section 5.7 of the.2006 edition);
m) The safety requirements and measures checklist has been revised (see Chapter 5, Chapter 6 of the.2006 edition);
n) Usage information has been changed (see Chapter 6, Chapter 7 in the.2006 edition);
o) A normative appendix, “Location of parking devices specified in 4.2.3.3.2 and 4.2.4”, has been added (see Appendix B);
p) A normative appendix, “Noise Testing Procedures”, has been added (see Appendix C).
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., Yiyang Rubber & Plastics Machinery Group Co., Ltd., and Shaoxing Jingxiang Machinery Manufacturing Co., Ltd.
Manufacturing Co., Ltd., Wanxiang Xinyuan Technology Co., Ltd., Fujian Jianyang Longxiang Technology Development Co., Ltd., Shenzhen Sueng Energy Saving Equipment Co., Ltd.
Company, Suzhou Tongda Machinery Co., Ltd., Yiyang Xinhua Mei Electromechanical Technology Co., Ltd., Beijing Rubber Industry Research and Design Institute Co., Ltd., Dalian Plastics
Materials Machinery Research Institute, National Plastics Machinery Product Quality Supervision and Inspection Center.
The main drafters of this document are. Li Yuankai, Wang Jinxia, Peng Zhishen, Xu Yongfeng, Zhu Yesheng, Chen Yuquan, Xun Shanglun, Xu Wenliang, and Xu Xiuli.
He Cheng, Wang Gengxin, Li Xianglan, Zheng Ji.
The release history of this document and the document it replaces is as follows.
---First published in.2006 as GB.20055-2006;
---This is the first revision.
introduction
According to the classification of GB/T 15706-2012, 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 in 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.
Safety requirements for open-type rubber mixing mills and plasticizing mills
1.Scope
This document specifies the safety requirements for the design and manufacture of open mixing mills (hereinafter referred to as "open mills").
This document applies to the entire lifecycle of the open mill (see section 5.4 of GB/T 15706-2012), during its intended use.
And all significant hazards and dangerous conditions related to the open mill that may arise from misuse that the manufacturer could reasonably foresee.
And hazardous events (see Appendix A).
This document does not cover the design of local exhaust ventilation systems that may be required in machine-specific applications that are unknown to the manufacturer.
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 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 approximate free field above a reflecting surface.
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 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 14574-2000 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 16754 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 was measured using a pseudo-free field method.
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 17248.5-2018 Noise emitted by acoustic machines and equipment—Measurement of noise from working position and other factors with accurate environmental correction.
Emitted sound pressure level at a specified location
GB/T 17799.2 General standards for electromagnetic compatibility – Part 2.Immunity standards in industrial environments
GB 17799.4 General Standard for Electromagnetic Compatibility - Part 4.Emissions in Industrial Environments
GB/T 18153-2024 Safety data for determining the temperature limits of accessible hot surfaces in machinery.
GB/T 18831-2017 Design and selection principles for interlocking devices related to mechanical safety and protective devices
GB/T 19436.1-2013 Mechanical and electrical safety - Electrically sensitive protective devices - Part 1.General requirements and tests
GB/T 19436.2-2013 Electrical Safety Equipment for Machinery - Part 2.Use of Active Photoelectric Protective Devices
Special requirements for (AOPDs) equipment
GB/T 19671-2022 Design and Selection Principles for Two-Handed Control Devices for Mechanical Safety
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GB/T 20055-2025: Safety requirements of mill for rubber and plastics
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