Islatma-Kurutmanın Kraft Kağıt Özellikleri Üzerine Etkileri

Bu çalışmanın amacı ıslatma-kurutma işlemlerinin ağartılmış kraft kağıtlarının özellikleri üzerine etkilerini araştırmaktır. Elde edilen sonuçlara göre; üç farklı firmadan (A, B ve C tipi) temin edilen kağıt numunelerinin sürekli ıslatılmasının ve kurutulmasının hem fiziksel hem de mukavemet özellikleri üzerinde etkili olduğu anlaşılmıştır. Bununla birlikte, başlangıç aşamaları (5. ıslatma-kurutma aşamasına kadar) yüksek derecede modifikasyon ile sonuçlanan dramatik etkilere sahipken sonraki her aşamanın fiziksel özellikler üzerinde ılımlı bir eğilim olduğu gözlemlenmiştir.Islatma-kurutma işlemi devam ederken azalan kopma uzunluğu ve patlama indeksinin aksine, yırtılma indeksi her iki yönde de değişmiştir (artar veya azalır). Bununla birlikte, numunelerin ıslatma-kurutma işlemleriyle kopma uzunluğunun %11.4 ile %67.8 aralığında azaldığı bulunmuştur. En düşük kopma uzunluğu 8. döngü aşamasında 1.79 km olan B tipi kağıtlarda gözlenmiştir. En düşük yırtılma indeksinin C tipi kağıtların 5. ıslatma-kurutma aşamasından sonra 2.64 mN.m2/gr değerinde olduğu, en yüksek yırtılma indeksinin ise B tipi kağıtların 6. ıslatma-kurutma aşamasında 5.62 mN.m2/gr değerinde olduğu tespit edilmiştir. Islatma-kurutma işlemi sırasında kağıt yapısının hasar gördüğü ve bağlanma potansiyellerinin azaldığı açıkça anlaşılmaktadır.

A Study on Effects of Wetting-Drying on Bleached Kraft Paper Properties

The aim of the study is to investigate effects of wetting-drying processes on bleached kraft paper properties. According to results; it has been realized that continuously wetting-drying of paper samples supplied from three different brand (A, B, and C types) effect on both physical and strength properties. However, initial stages (up to 5th cycling stages) have dramatic effects resulting in a high degree of modification, considering the fact that each following stage is moderate trend on physical properties. Contrary to breaking length and burst index that have a reducing trend as wetting-drying in progress, the tear index changed in both directions (increases or decreases). However, breaking length of samples were found to be reduced range of 11.4% to 67.8%. Nevertheless, the lowest breaking length was observed B type of papers with 1.79 km at 8th cycling stage. The lowest tear index of 2.64 mN.m2/gr was found at 5th cycling stage for C type papers while the highest tear index of 5.62 mN.m2/gr was found at 6th cycling stage for B type papers. It is clearly realized that the paper network structure are damaged and bonding potentials reduced during the wetting-drying process.

Keywords:

Paper, wetting, drying physical, strength,

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