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- W2047731249 abstract "Des tuyaux flexibles de PVC pour le transport du lait réagissent avec les composantes du lait et, au cours du nettoyage, avec l'eau et les solutions de nettoyage. Les procès de diffusion qui ont lieu duns cette connection ont été étudiés d l'aide de méthodes de simulation (rotation d'un tube annulaire rempli de lait, dispositif d'essai pour reproduire le travail et le nettoyage de trayeuses). Après les essais on a déterminé surtout le passage du plastifiant dans le liquide et le passage de matière grasse dans la matière plastique, tandis que dans le cas des solutions de nettoyage on a tenu compte de l'absorption d'eau par 1a matièe plastique. Les pertes de plastifiant ainsi que l'absorption de matiètre grasse dépendent en premier lieu de l'état de gonflage du PVC, plus gonflé 1e PVC, plus facile la diffusion du plastifiant. Au cours du contact avec le lait, le film gras formé empeêche l'absorption d'eau, mais cet effet est annulé après par le nettoyage. C'est pourquoi il se manifeste, après un certain temps, une fragilisation avec fissuration. Investigations into and considerations concerning the use of plastics in contact with foodstuffs. XVIth Communication: Diffusion processes in PVC hoses for food products Milk hoses of PVC react with the constituents of milk and – during the subsequent cleaning operations – also with water and cleaning solutions. The diffusion processes taking place in this connection are studied with the aid of specially designed simulating methods (rotating, milk- filled annular hose, testing apparatus reproducing the operation and cleaning of milking machines). After the tests one has determined in particular the transition of plasticiser into the liquid and the transition of fat into the plastic material, while in the case of cleaning solutions the water absorption by the plastic has been determined. The loss of plasticiser and the absorption of fatty materials depend primarily from the swelling condition of the PVC: the higher the swelling of the plastic, the easier the loss of plasticiser. During the contact with milk the then existing fatty film on the plastic inhibits water absorption, but this effect is eliminated by the cleaning operations. With increasing time embrittlement connected with cracking is observed." @default.
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- W2047731249 date "1971-09-01" @default.
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- W2047731249 title "Untersuchungen und Betrachtungen zur Anwendung von Kunststoffen für Lebensmittel XVI. Mitteilung: Diffusionsvorgänge an PVC-Schläuchen für Lebensmittel" @default.
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- W2047731249 doi "https://doi.org/10.1002/maco.19710220902" @default.
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