Effect of Basis Weight on Paper Properties of Scots Pine and European Black Pine Kraft Pulp

Abstract

The physical, optical, and mechanical characteristics of handsheets made from kraft pulps of Scots pine (Pinus sylvestris L.) and European black pine (Pinus nigra Arn.) in basis weight ranging from 50 to 125 g/m2 (15 g/m2 intervals) were assessed in this study. The thickness, bulk, apparent density, opacity, burst strength, tear strength, tensile strength, stretch and tensile energy absorption (TEA) properties of papers obtained in different grammages were evaluated. The results showed that basis weight of handsheets had a significant effect of examined properties of handsheets. In both pulp samples, when the handsheet basis weight increased, the tensile strength, burst strength, tear strength, apparent density and opacity of the handsheets increased while bulk decreased. In all basis weight values, Scots pine handsheets had higher tensile and burst strengths, opacity, and apparent density than those of European black pine handsheets. Therefore, Scots pine pulps can be more suited for packaging purposes. This study shows that kraft pulps obtained from different wood species can be optimized and desired paper properties can be achieved by appropriate basis weight selections.

Keywords

• Scots pine
• European black pine
• basis weight
• kraft pulp
• paper properties

Sarıçam ve Karaçam Kraft Kağıt Hamurunun Kağıt Özellikleri Üzerine Gramajın Etkisi

Öz

Bu çalışmada, sarıçam (Pinus sylvestris L.) ve karaçam (Pinus nigra Arn.) kraft hamurlarından 50 ile 125 g/m2 (15 g/m2 aralıklı) gramajda üretilen deneme kağıtlarının fiziksel, optik ve mekanik özellikleri değerlendirilmiştir. Farklı gramajlarda elde edilen kağıtların kalınlık, hacimlilik, yoğunluk, opaklık, patlama sağlamlığı, yırtılma sağlamlığı, kopma sağlamlığı, uzama ve kopma enerji absorpsiyonu özellikleri değerlendirilmiştir. Sonuçlar, deneme kağıtlarının gramajının incelenen kağıt özellikleri üzerinde önemli bir etkiye sahip olduğunu göstermiştir. Her iki kağıt hamuru örneğinde de, deneme kağıdı gramajı arttıkça, kağıtların kopma sağlamlığı, patlama sağlamlığı, yırtılma sağlamlığı, yoğunluk ve opaklığı artarken hacimliliği azalmıştır. Tüm gramaj değerlerinde, sarıçam deneme kağıtlarının kopma ve patlama sağlamlıkları, opaklığı ve yoğunluğu karaçam deneme kağıtlarına göre daha yüksektir. Bu yüzden, sarıçam kraft kağıtları paketleme amaçları için daha uygun olabilir. Bu çalışma, farklı ağaç türlerinden elde edilen kraft hamurlarının optimize edilebileceğini ve uygun gramaj seçimleri ile istenilen kağıt özelliklerine ulaşılabileceğini göstermektedir.

Anahtar Kelimeler

• Sarıçam
• karaçam
• gramaj
• kraft kağıt hamuru
• kağıt özellikleri

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