Methods for improving resitance to fumigant sorption in a...

B - Operations – Transporting – 65 – B

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B65B 29/02 (2006.01)

Patent

CA 2631717

Methods for improving the resistance of fumigant sorption in produce containers made from expandable polystyrene particles in a fumigation process, and related produce containers. An embodiment involves pre-expanding the expandable polystyrene particles to form pre-expanded particles; applying a coating comprised of a chemical selected from the group consisting of mineral oil, polyethylene wax, ethylene vinyl alcohol copolymer, and polyethylene glycol to the pre-expanded particles and in amount of 0.05 to 5.0 parts per hundred; and forming the container from the pre-expanded particles. A further embodiment involves applying the chemical coating to the expandable particles; pre-expanding the expandable polystyrene particles to form pre-expanded particles; and forming the containers from the pre-expanded particles. Other methods involve increasing the cell size of the expandable particles used to form the produce container.

L'invention concerne un procédé permettant d'améliorer la résistance des contenants pour produits primaires constitués de particules de polystyrène expansible à la sorption du fumigant lors d'un processus de fumigation, ainsi que les contenants pour produits primaires correspondants. Dans un mode de mise en oeuvre, ce procédé consiste à préexpanser les particules de polystyrène expansible, à appliquer sur les particules préexpansées un revêtement constitué d'un produit chimique choisi dans le groupe suivant: huile minérale, cire de polyéthylène, copolymère d'éthylène-alcool vinylique, et polyéthylène glycol, à une proportion de 0,05 à 5,0 parties pour cent, et à former le contenant à partir de ces particules préexpansées. Dans un autre mode de mise en oeuvre, le procédé consiste à appliquer le revêtement chimique sur les particules expansibles, à préexpanser les particules de polystyrène expansibles pour former des particules préexpansées, et à former les contenants à partir de ces particules préexpansées. Des procédés différents comprennent une augmentation de la taille des alvéoles des particules expansibles servant à former le contenant de produits primaires.

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