Klear Can passes food safety tests

US-based Milacron Holdings Corp. says its Klear Can technology has undergone and passed an important food safety test and is undergoing additional testing with a number of select prospects.

The Klear Can is an ideal alternative to metal cans for fruits, vegetables, soups, meats, and other products. It uses the same filling, seaming and retorting machinery as metal cans so minimal downstream investment is required. It also enables manufacturers to produce/mould cans at the filling site (through the wall operations), be cost competitive to the metal can, and allow brand owners to demonstrate quality of the product to consumers.


Before a new food or beverage container can be used commercially, the container has to pass a universally accepted series of testing for potential leakage of the double seam or the container structure. The normal test is a Biotest, which is a comparative method of examining leakage rates of a container or its seals.

Double seaming is a metal forming process, which utilises a seaming chuck, which fits the end being sealed onto the container. There are two steps to this process:

  1. A first operation seaming roll, which rolls the end curl material which is lined with a flexible compound onto the flange material of the container and
  2. A second operation roll that irons out the resultant double seam formed between the end material and compound and the body material producing a hermetically sound seal.

Although the double seaming principle appears simple, it encompasses a wide range of parameters that can influence the double seam performance and integrity. The double seam is the most complex and critical factor in ensuring that the seal between the can end, the can end compound and the body material will withstand processing temperatures up to 121 degrees C. The seal must also withstand external factors related to the retorting process and handling without allowing a leakage path to form which could allow micro-organisms to enter or in the case of a beverage container, internal pressures to vent.

After conducting rigorous Biotests on the functionality of the Klear Can’s easy open double seamed lid process, it has been concluded this container is suitably and safely sealed.

Klear Can field testing continues in Belgium where they have been filled with vegetables in an isolated environment and are ready for market trials. Consumer sampling tests have also been conducted with the cans being filled with fruit and were presented within market surveys and to focus groups. To date consumers are giving the “thumbs-up” to Klear Can’s appeal and attractiveness.

Milacron Vice President/General Manager Co-injection Systems, Steve Morris says that Milacron is the world’s largest supplier of turnkey co-injection systems to the plastics and packaging industries, adding that the multi-layer packaging technology is designed to meet the plastics industry’s need for a successful high barrier technology “in a robust multi-layer plastic preform or closure, delivered with the same high-volume production efficiencies and cycle times as monolayer plastic preforms or containers without barriers.”

Milacron co-injection technology can be applied to production of PET/PP blow moulded containers, thin wall containers, closures and medical parts.


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