GB/T 25434-2025Safety requirements of rubber and plastics calenders (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 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.

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

GB/T 1251.1

GB/T 3766

GB/T 3767

GB/T 3768

GB/T 5226.1-2019

GB/T 7932

GB/T 8196-2018

GB/T 12265-2021

GB/T 14048.20-2013

GB/T 14574

GB/T 15706-2012

GB/T 16404.2

GB/T 16538

GB/T 16754

GB/T 16855.1-2018

GB/T 17248.2

GB/T 17248.3