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CETIE Guide 4
CETIE Guide 4
CETIE Guide 4 is a voluntary bottling guide published by CETIE — the International Technical Centre for Bottling and Related Packaging — that provides comprehensive good practice recommendations for the application of 26 mm crown caps onto glass bottle finishes. The guide specifically addresses crown caps equipped with plastic liners, used on glass finishes designed for both pry-off and twist-crown applications. It focuses primarily on crown caps with a 6 mm height, covering the critical interrelationship between cap design, liner performance, glass finish geometry, and capping machine parameters. Presto Stantest, a leading manufacturer of precision testing and quality control instruments, supports beverage manufacturers and bottlers in validating crown cap application quality in alignment with this guide's technical requirements.
Significance One of the most popular closure types worldwide—used for beer, carbonated soft drinks, mineral water, and other bottled products. A good crown cap seal is directly related to the ability of the product to hold its pressure, product freshness, tamper proofing, and consumer safety. CETIE Guide 4 enables bottlers, crown cap manufacturers, and capping machine suppliers to work from a shared technical reference, minimizing capping defects, reducing product losses, and ensuring that closure performance consistently meets both contractual specifications and end-user expectations across diverse production environments. CETIE Guide 4 applies to the 26 mm crown capping process using plastic-lined crown caps on glass finishes adapted for both pry-off and twist-crown closure systems. The guide defines the functional requirements of the crown cap and liner, specifies component interrelationships between the cap, liner, and glass finish, and outlines capping machine parameters including roller geometry, capping head pressure, and application settings. It includes control methods for evaluating finished closure quality, covering checks such as vertical capping load verification and removal force assessment, along with recommended acceptance criteria to support production quality control and supplier qualification activities.Scope