Conveyor lubricant, passivation of a thermoplastic container...

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 23/08 (2006.01) B65G 45/00 (2006.01) C08J 7/06 (2006.01) C10M 101/00 (2006.01) C10M 173/00 (2006.01)

Patent

CA 2381733

Thermally formed thermoplastic articles can be protected from stress cracking in the presence of stress cracking promoting compounds by forming a shaped article comprising a thermoplastic and a liquid hydrocarbon oil composition. We have found that the liquid hydrocarbon oil composition prevents the stress cracking promoting materials from interacting with the polymeric structure of the stressed container to prevent or inhibit stress cracking in such materials. The methods and compositions of the invention are particularly useful in preventing stress cracking in polyethylene terephthalate beverage containers during bottling operations during which the bottle is contacted with aqueous and non-aqueous materials such as cleaners and lubricants that can interact with the polyester to cause stress cracking particularly in the container base. A process for lubricating a container, such as a beverage container, or a conveyor for containers, by applying to the container or conveyor, a thin continuous, substantially non-dripping layer of a liquid lubricant. The process provides many advantages compared to the use of a conventional dilute aqueous lubricant.

On peut protéger contre les fissurations des articles thermoformés mis en présence de composés favorisant les fissurations en façonnant un article en forme comprenant un thermoplastique et une composition d'huile hydrocarbure liquide. Nous avons découvert que cette composition d'huile hydrocarbure liquide empêche les matériaux favorisant les fissures d'interagir avec la structure polymère du contenant soumis aux contraintes de façon à empêcher ou inhiber la survenue de fissurations dans ces matériaux. Les procédés et les compositions de cette invention conviennent particulièrement pour empêcher la survenue de fissurations dans les contenants de téréphthalate de polyéthylène pour boisson, au cours des opérations d'embouteillage pendant lesquelles la bouteille est mis en contact avec des matériaux aqueux et non aqueux, tels que des nettoyants et des lubrifiants, qui peuvent interagir avec le polyester et entraîner des fissurations, en particulier au niveau de la base du contenant. Cette invention concerne un processus de lubrification d'un contenant, tel qu'un contenant pour boisson, ou d'un transporteur pour contenants, qui consiste à appliquer sur le contenant ou le transporteur une fine couche continue et sensiblement sans coulure d'un liquide lubrifiant. Ce processus offre de nombreux avantages par rapport à celui qui utilise un lubrifiant aqueux dilué conventionnel.

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