Effects of decreasing grammage on the handsheet properties of unbeaten and beaten kraft pulps

Öz

The aim of this study was to investigate the effects of decreasing grammage on handsheet properties of unbeaten (15 °SR) and beaten (35 °SR) kraft pulps of European aspen (Populus tremula L.) and maritime pine (Pinus pinaster Ait.). Six different basis weights from 100 g/m2 to 50 g/m2 (with 10 g/m2 intervals) were employed. Tensile index, TEA (tensile energy absorption), burst index, tear index, opacity, and apparent density of the handsheets gradually decreased with decreasing handsheet grammage. The decrease in strength properties that occurred with decreasing grammage was more evident in unbeaten pulps of both species than in beaten pulps. However, the effect of decreasing grammage on apparent density and opacity was more pronounced in beaten pulp handsheets of both species than in unbeaten pulp handsheets. Keywords: Decreasing grammage, European aspen, Maritime pine, Kraft, Paper properties

Anahtar Kelimeler

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Dövülmüş ve dövülmemiş kraft hamurlarının kağıt özellikleri üzerine azalan gramajın etkileri

Öz

Bu çalışmada, dövülmemiş (15 °SR) ve dövülmüş (35 °SR) titrek kavak (Populus tremula L.) ve sahil çamı (Pinus pinaster Ait.) kraft hamurlarından elde edilen deneme kağıtlarının özellikleri üzerine azalan kağıt gramajının etkileri belirlenmiştir. 100 g/m2’den 50 g/m2’ye kadar (10 g/m2 aralıklarla) 6 farklı gramajda kağıtların üretilmiştir. Kağıtların kopma indisi, TEA, patlama indisi, yırtılma indisi, opaklık ve yoğunluk değerleri azalan kağıt gramajı ile tedrici olarak azalmıştır. Hem titrek kavak hem de sahil çamı örneklerinde, azalan gramajla meydana gelen sağlamlık kayıplarının dövülmemiş hamurlarda dövülmüş hamurlara göre daha belirgin olduğu tespit edilmiştir. Fakat, kağıdın opaklığı ve yoğunluğu üzerine azalan gramajın etkisinin dövülmüş hamurlarda dövülmemiş hamurlara nazaran daha belirgin olduğu görülmüştür. Anahtar kelimeler: Azalan gramaj, Titrek kavak, Sahil çamı, Kraft, Kağıt özellikleri

Anahtar Kelimeler

• Azalan gramaj, Titrek kavak, Sahil çamı, Kraft, Kağıt özellikleri

Kaynakça

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