British Standards Institution

Source:: ISO
Committee:: PKW/0 - Packaging
Categories:: Information management | Standardization. General rules | Measurement and Science | Metrology and measurement | Measuring instruments | Manufacturing | Packaging and distribution | Packaging and distribution. General | Packaging materials and accessories | Containers. General purpose

Scope

This document specifies terms and definitions, classifications and types, specifications and dimensions of twist-off caps.

This document is applicable to twist-off caps made from tinplate and fit vacuum tight glass containers for food and beverage packaging.

Purpose

Metal caps are essential components for sealing glass jars and bottles in packaging. It is a traditional packaging form for food and beverage. At present twist-off caps or lug caps are the most commonly used vacuum-type closures for glass containers. The vacuum in headspace keeps the hermetic seal and maintain long shelf life for food and beverage products. The primary advantage of twist-off caps is they meet the need of ease opening and closing with 1/4 to 1/2 twist. Twist-off caps are made from tinplate with a thickness of 0.145 ~ 0.24mm, within the scope of ISO/TC 52.

Glass containers have different neck finishes and only the appropriate metal caps are able to match. In the case of twist-off caps, they only fit unique thread on lug finishes. The lug finish is particular design for glass containers. CEN/TC 261 Packaging and ISO/TC 63 Glass containers have developed ISO 9100:2005 Part 1-14 for vacuum lug finishes, with commonly used diameters and heights. However, so far there is no international standard for corresponding metal caps.

Airtight determines interior vacuum and it requires precise dimensions of all parts of glass containers. This document will provide consensual measuring method for dimensions of metal twist-off caps. It will not only match ISO 9100 series, but also facilitate container, cap suppliers and end-users. This project will hopefully followed by continued thread caps, crown caps and pilfer-proof caps for glass bottles, to develop international standards or deliverables for various glass containers.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

18/12/2019

Proposal end date:

23/01/2020

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

Learn more about the standards development process

Standards Development

ISO/TC 52 N 59, ISO/NP 4544 Light gauge metal containers--Twist-off caps--Measuring method for dimensions

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