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- W1984932825 abstract "The permeability to water and humidity of films of plastic materials of different natures and thicknesses was the object of much research achieved by many methods. However, these methods, while relatively simple, are very laborious, demand much time (for example, the gravimetric method), and are often imprecise. The hygrophotographic method is as simple as it is rapid. It requires a minimum of measuring instruments, or, in cases of urgency, no instruments a t all. Special attention was given to the action on the permeability of certain factors such as presence of plasticizers, radioactive rays, temperature, and aging. It was demonstrated that while the presence of plasticizer increases the permeability to water, aging lowers it, precisely because of the departure of this plasticizer during the aging process. It was confirmed that in certain cases (e.g., polyethylene deprived of plasticizers) the law of Q10, according to which in general the permeability of a good film approximately doubles for a 10°C. (18°F.) rise in temperature, is sufficiently verified and that in other cases (e.g., plasticized PVC) the experimental results deviate considerably from ths simple law: the augmentation is at times much greater, especially between 45 and 55°C., than this law indicates, whereas between 55 and 65°C. the law obtains better. On the other hand, the action of the γ-rays is manifested by an increase, sufficiently visible, of the permeability when the polyethylenic film is irradiated in vacuum, but when irradiated in air the films become too brittle for handling. A series of systematic tests determined the importance of the phenomenon of sorption for the different kinds of plastic films; the degrees of discoloration of the hygrophotographic plates enclosed in plastic bags new or previously heated in an oven at 65°C. during a specified time were compared. It was observed that the thicker the film, the more humidity absorbed. The Manolene films, 200 μ in thickness, had to be heated for 13 hr. at 65°C. for the sorbed water to be completely evaporated." @default.
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- W1984932825 date "1962-09-01" @default.
- W1984932825 modified "2023-09-27" @default.
- W1984932825 title "Hygrophotographic studies on the permeability to water and moisture of packaging materials" @default.
- W1984932825 doi "https://doi.org/10.1002/app.1962.070062311" @default.
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