GB/T 13521-2016 in English

《GB/T 13521-2016冠形瓶盖》由TC49（全国包装标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

ICS
A
National Standard of the People’s Republic of China
GB/T 13521-
Replaces GB/T 13521-
Crown cap
冠形瓶盖
(English Translation)
Issue date: 2016-02-24 Implementation date: 2016
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China
the Standardization Administration of the People’s Republic of China
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product structure
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transport and storage
Foreword
ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 13521-1992 Crown cap. The following technical changes have been made with respect to GB/T 13521-1992:
——The definition of cap is modified (see Clause 3);
——The requirements for basic dimensions and deviations of caps are revised (see 5.2);
——The test methods for tightness and instantaneous pressure resistance are modified (see 5.5.3);
——Cap gasket materials such as polyethylene are added (see 5.4.2 and 6.3);
——The classification of the premium grade and qualified grade for caps are deleted.
This standard was proposed by and is under the jurisdiction of the National Technical Committee 49 on Packaging of Standardization Administration of China (SAC/TC 49).
The previous edition of this standard is as follows:
——GB/T 13521-1992.
Crown cap
1 Scope
This standard specifies the dimensions, requirements, test methods, inspection rules, and marking, packaging, transport and storage of crown caps made of electrolytic tinplate (or electrolytic chromium/chromium oxide coated steel sheet) for food packaging such as beer and beverage (hereinafter referred to as "caps").
This standard is applicable to the caps for sealing finishes which meet the requirements of QB/T 3729. This standard may also serve as a reference for the caps for sealing finishes for containers made of other materials.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2520 Cold-reduced electrolytic tinplate
GB/T 24180 Cold-reduced electrolytic chromium/chromium oxide coated steel sheet and strip
QB/T 3729 Glass containers - Crown finishes dimensions
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
crown cap
bottle cap composed of a crown-shaped metal matrix with teeth on the periphery and an embedded sealing gasket, which is used for sealing the finish meets the requirements of QB/T 3729 to meet the packaging requirements of beer, beverage and other products with air tightness requirements
4 Product structure
See Figure 1 for the schematic diagram of cap structures.
Key:
S——the thickness of the matrix;
D——the outside diameter;
d——the inner diameter;
H——the cap height.
Figure 1 Schematic diagram for cap structures