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2 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2 2012

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Degradation of paper products from waste pulp type C with the addition of different colour pigments under the influence of UV radiation

Modzelewska I., Patelski E., Jaszczur A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 79

42--46

Degradation of paper products from waste pulp type C with the addition of different colour pigments under the influence of UV radiation. In this paper the ageing process of paper products made of waste pulp type C was examined with different content of fillers and colourful pigments under the influence of the UV radiation. For this purpose, examinations sheets of paper were produced with addition of 3, 5 and 10% of titanic white and synthetic ferric pigments (combination of Fe2O3 and FeO (OH)) Bayferrox 610 and 960, as well as with the addition of resin adhesive of 2, 3 and 5% concentration, based on dry pulp. For comparison results were also carried out control sheets without any additions. Samples of paper were examined taking into account color change and breaking length after artificial ageing process of the light. Studies have shown that with the increase in the share of paper pigments the colour changes are much less noticeable. It has also indicated that the decrease of paper strength with the addition of titanium white and resin adhesive was very sharp only in the initial stages of ageing.

Aspects of thermal ageing of paper products from waste pulp type C with the addition of different colour pigments

Modzelewska I., Patelski E., Kujaszewska A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 79

47--51

Aspects of thermal ageing of paper products from waste pulp type C with the addition of different colour pigments. This work constitutes the fragment of the research on broad issue concerning aspects of the ageing process of paper products obtained from waste pulps, examining the income of the allowance of colourful pigments of the thermal decline of papers from waste pulp type C (office waste paper). The paper sheets were produced from the 3%, the 5% and the 10% with addition of titanic white and synthetic ferric pigments (combination Fe2O3 and FeO(OH)) Bayferrox 610 and 960. Test samples were formed without pulp additions. The paper sheets, in laboratory conditions, were examined taking into account the colour and breaking length. Next, paper was subjected artificial ageing, under the influence of the temperature and the change of its colour and breaking length were indicated. Examinations showed that along with the growth of the participation of pigments the change of the colour of paper was falling, and fall breaking length of paper with pulp additions is not so violent like in the case of control samples. After analysing research findings they stated, that addition of colouring centres i.e. as synthetic ferric pigments to paper products from waste pulp type C is beneficial since their presence is delaying the ageing process, and does not affect much breaking length.