Guide No. 4
Revision I
Published on: 28/09/2020
26 mm crown capping
Scope of application
This document concerns the crowning process, using crown caps for which the seal is provided by a plastic liner, onto glass finishes adapted to either "pry-off" or "twist crown" applications. It mainly focuses on capping with crown caps designed with a 6 mm height and a 26 mm diameter, as defined in EN 17177 - GLASS PACKAGING - CROWN CAP - 26 MM DIAMETER, 6 MM HEIGHT CROWN CAP, onto glass bottles.
The main objectives of the document are:
It has been drafted concerning those standards that are either current or in preparation and to other reference documents recognised in the industry, and identified as pertinent.
The main objectives of the document are:
- to provide manufacturers and users with a reference tool that can ensure the correct procedures for crowning and also the safety of the consumer;
- to give the specifications of each of the components and their interfaces;
- to provide manufacturers and users with a reference document for drafting specification sheets and quality assurance procedures;
- to simplify troubleshooting in the event of problems.
It has been drafted concerning those standards that are either current or in preparation and to other reference documents recognised in the industry, and identified as pertinent.
Table of contents
1. Scope
2. Definitions and terms used
2.1 Crown caps
2.1.1 Pictorial representation and terms
2.1.2 6 mm height crown caps
2.2 Units used in the document
3. General considerations
3.1 The pressure developed within capped bottles
4. Specifications of components
4.1 Crown cap
2. Definitions and terms used
2.1 Crown caps
2.1.1 Pictorial representation and terms
2.1.2 6 mm height crown caps
2.2 Units used in the document
3. General considerations
3.1 The pressure developed within capped bottles
4. Specifications of components
4.1 Crown cap
4.1.1 General considerations
4.1.2 Functions
4.1.3 Crown cap shell
4.1.4 Varnish coating
4.1.5 Liner
4.2 Bottle
4.2.1 General considerations
4.2.2 Functions
5. Application
5.1 Basic capping process
5.2 Capping machine
5.2.1 General principles
5.2.2 Crown cap feed
5.2.3 Bottle Supply System
5.3 Crowner's heads
5.3.1 Function and overall structure
5.3.2 Setting the height of the crowner head
5.3.3 Ejector
5.3.4 Throat
5.4 Checking and adjusting the crowner head assembly
5.4.1 Initial checks
5.4.2 Table Equipment
5.4.3 Alignment of bottle and crowner head axes
5.4.4 Setting plunger and compensation springs
5.5 Cap rinsing and drying after application
6. Inspection
6.1 Inspection of incoming components
6.1.1 Crown cap
6.1.2 Bottle
6.2 Inspection during production
6.2.1 Bottle finish online inspection
6.2.2 The overall shape of crimped crown caps
6.2.3 Visual check of shape
6.2.4 Visual checks on positioning
6.2.5 Dimensional checks of crimping
6.3 Inspection of finished products
6.3.1 Checking bottling pressure retention
6.3.2 Other checks
7. Quality and appearance of products for the end user
7.1 Corrosion prevention
7.1.1 Corrosion factors
7.1.2 Preventive measures
7.2 Scavenger and barrier functions
7.2.1 Scavenger function
7.2.2 Passive barriers
8. Troubleshooting
9. Recommendation s for bottle openers
10. Related documents
10.1 Standards
10.2 Cetie
10.3 Others
11. Document history
Annexes
Annex contributors to the first edition (2002)
Annex B Typical volumetric thermal expansion coefficients of bottled products
Annex C Test procedure - Cap varnish dust production evaluation
Annex D Other tests
4.1.2 Functions
4.1.3 Crown cap shell
4.1.4 Varnish coating
4.1.5 Liner
4.2 Bottle
4.2.1 General considerations
4.2.2 Functions
5. Application
5.1 Basic capping process
5.2 Capping machine
5.2.1 General principles
5.2.2 Crown cap feed
5.2.3 Bottle Supply System
5.3 Crowner's heads
5.3.1 Function and overall structure
5.3.2 Setting the height of the crowner head
5.3.3 Ejector
5.3.4 Throat
5.4 Checking and adjusting the crowner head assembly
5.4.1 Initial checks
5.4.2 Table Equipment
5.4.3 Alignment of bottle and crowner head axes
5.4.4 Setting plunger and compensation springs
5.5 Cap rinsing and drying after application
6. Inspection
6.1 Inspection of incoming components
6.1.1 Crown cap
6.1.2 Bottle
6.2 Inspection during production
6.2.1 Bottle finish online inspection
6.2.2 The overall shape of crimped crown caps
6.2.3 Visual check of shape
6.2.4 Visual checks on positioning
6.2.5 Dimensional checks of crimping
6.3 Inspection of finished products
6.3.1 Checking bottling pressure retention
6.3.2 Other checks
7. Quality and appearance of products for the end user
7.1 Corrosion prevention
7.1.1 Corrosion factors
7.1.2 Preventive measures
7.2 Scavenger and barrier functions
7.2.1 Scavenger function
7.2.2 Passive barriers
8. Troubleshooting
9. Recommendation s for bottle openers
10. Related documents
10.1 Standards
10.2 Cetie
10.3 Others
11. Document history
Annexes
Annex contributors to the first edition (2002)
Annex B Typical volumetric thermal expansion coefficients of bottled products
Annex C Test procedure - Cap varnish dust production evaluation
Annex D Other tests
History
First edition: 01/2002
Revision I: 09/2020
First edition: 01/2002
Revision I: 09/2020
Contributors
AB-INBEV, ACTEGA, AME (ASOCIACION METALGRAFICA ESPANOLA), ARDAGH GERMANY, ASTIR, BACARDI, BRITISH GLASS, BRITVIC, CARLSBERG, CARLSBERG, COCA-COLA SERVICES, ENCIRC GLASS, GCP APPLIED TECHNOLOGIES, GEBO PACKAGING SOLUTIONS, HELMUT BRUENINHSHAUS, JOSE COMBALIA S.A, JSP INTERNATIONAL, KRONES, NEW BOX, ORANGINA-SCHWEPPES, PELLICONI, PEPSICO, RAUH, SACMI, TAPON, VALENTIN-THIERION, VERALLIA GERMANY, VERALLIA GERMANY, VERALLIA SPAIN, VERBAND METAL VERPACKUNGEN, VETROCONSULT (VETROPACK), WARSTEINER
Document under responsibility of working group:
Cap manufacturers wg1 and glass manufacturers wg3
WG chair: Klaus DEMBSKI - BUNDESVERBAND GLASINDUSTRIE E.V. (Federal Association of the German Glass Industry)
Vice WG chair : Mr. Giuseppe MENCACCI (Process innovation manager - GUALA CLOSURES S.P.A.)
This joint group aims to coordinate the production of documentation at the junction of glass container production and closure application. It accompanies the development of documentation for glass containers for different types of closures including, but not limited to, aluminum screw caps, crown caps, and their components (liners). This joint group also provides an opportunity for cap and liners manufacturers to open discussions on specific work items of the permanent glass groups
This joint group aims to coordinate the production of documentation at the junction of glass container production and closure application. It accompanies the development of documentation for glass containers for different types of closures including, but not limited to, aluminum screw caps, crown caps, and their components (liners). This joint group also provides an opportunity for cap and liners manufacturers to open discussions on specific work items of the permanent glass groups
