| Abstract: |
In this work, two types of papers were used namely, photocopy paper and paperboard which written with two types of inks namely, blue roller ink and black ink jet, and then covered with hot molt adhesive plastic sheet namely, ethylene vinyl acetate copolymThe effect of accelerated thermal and photo-oxidative aging for different time intervals on the stability of the color of inks on uncovered and covered papers with plastic sheet was examined in day light and under ultraviolet lamp.We concluded that the black ink jet was more resistance to fading or change its color during time intervals of aging comparing with blue roller ballpoint ink, either on uncovered or covered papers with plastic sheet. Moreover, the color of two types of inThe additives are incorporated in the plastic sheet which resist the oxidation to some extent and capable of capturing and dissipating a large amount of harmful radiation. The two types of inks showed more stability to fading on paperboard than on photocoThis work also included adhesived of a plastic sheet by normal coating machine on the two types of paper samples used in this work, photocopy paper and paperboard. The sampels were exposed to thermal treatment at 50?C in order to separate the plastic fromthe cover plastic strip or sheet, which showed a difference between the spectra of the initial sample of the plastic and plastic with spots of gum.The adhesived plastic sheets on the two types of papers were exposed to omit different at 100?C for the periods from 20 to 50 hours, and then each sample was exposed to ultraviolet radiation (254nm) for 72 hours, in order to study the forgery and durabiliThe properties of the aged adhesived plastic sheets on the paper were examined, i.e. homogeneity, wrinkles, whiteness, opacity, transmittance through light, tensile strength and adhesive strength. Peel strength of the aged samples was measured during sepaThe shape of fracture surface of SEM micrographs of the samples depended upon interfacial adhesion between plastic sheet and papers during accelerated aging.We concluded that hydrogen bonds between the paper fiber and plastic copolymer in untreated and treated samples for 20 hours were formed leading to good and complete dispersion of the fibers of the cellulosic papers on all the surface of the copolymer, anwas obtained. On the contrary, in the case of the samples treated for 50 hours, degradation of the plastic occurred and consequently higher lack in the interfacial interaction took place. So, the adhesion nearly did not occurred in the most part of sample
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