Paper Coating
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Özet Kuşeleme işlemi genel olarak kağıt ve kartonların optik ve yüzey özelliklerini geliştirmek için yapılmaktadır. Kağıdın optik özelliklerindeki yükselişler baskı kalitesinde iyileşmeleri sağlamaktadır. Bu çalışmada, kuşe karton üretimi... more
Özet Kuşeleme işlemi genel olarak kağıt ve kartonların optik ve yüzey özelliklerini geliştirmek için yapılmaktadır. Kağıdın optik özelliklerindeki yükselişler baskı kalitesinde iyileşmeleri sağlamaktadır. Bu çalışmada, kuşe karton üretimi için uzun ve kısa lif harmanları kullanılarak 160-170 gramajlarında kartonlar üretilmiştir. Kuşeleme işleminde kuşe pigmenti olarak PCC ve GCC kullanılmış olup nişasta ve karboksimetil selüloz kullanılarak kuşe harçları hazırlanmıştır. Kuşe harçları karton yüzeyine 2 numaralı rod yardımı ile uygulanmıştır. Belirli oranlarda PCC ve GCC kullanılarak üretilen kuşe kartonlar fiziksel ve optik testlere tabi tutulmuştur. Elde edilen sonuçlara göre, kuşe karton üretiminde kuşe pigmenti olarak PCC ve GCC kullanıldığında beyazlık ve parlaklık değerleri sırasıyla %3.91 ve %4.70 oranına kadar artış göstermiştir. Fiziksel özelliklerde ise belirgin azalmalar meydana gelmiştir. PCC ve GCC kendi aralarında karşılaştırıldığında PCC ile kuşelenen kartonların yüzey pürüzlülüğü GCC'ye göre daha iyi çıkmıştır. Aynı zamanda kuşe harcındaki PCC oranındaki artışa paralel olarak kuşe kartonların optik özelliklerinde artışların olduğu tespit edilmiştir. Kuşe kartonların kuşelenme işleminde kuşe pigmenti olarak PCC'nin kullanılması hem yüzey düzgünlüğü hem de baskı kalitesi açısında GCC'ye göre daha iyi sonuçlar vermiştir. Anahtar Kelimeler: Kuşe karton, PCC, GCC
The aim of the coating process is to improve whiteness, brightness, opacity, surface smoothness and water resistance of paper and board. In this study, the effects of PCC and GCC on the physical and optical properties of coated papers... more
The aim of the coating process is to improve whiteness, brightness, opacity, surface smoothness and water resistance of paper and board. In this study, the effects of PCC and GCC on the physical and optical properties of coated papers were investigated. Writing and printing papers were produced with using bleached short (70%) and long (30%) fiber mixtures. Calcium carbonate (86.7%), starch (15%) and carboxymethyl cellulose (0.3) were used as coating materials. Precipitated (PCC) and ground (GCC) calcium carbonates were adjusted to 50% concentration with tap water. Coating suspensions were prepared with PCC and GCC mixtures and applied to paper surfaces with coating rod (no:2). The coated papers were dried at room condition and calendered under 15 bar pressure at 100˚C. The physical and optical properties of the coated papers were investigated and compared with each other. The results show that using PCC as coating material increased the optical properties of the papers and gave better results than GCC. The breaking length was found to be higher with using GCC. In terms of surface roughness, there were differences between of GCC and PCC coated papers. As a result, the use of PCC instead of GCC as a coating material has been found to improve the optical properties and the surface roughness of paper. The improvement of optical properties is costly for papermakers and this problem can be solved with using PCC as a coating materials.
- by Mustafa Çiçekler and +1
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- GCC, PCC, Coated Paper, Paper Coating
Wallpaper is pasted in vertical strips over the walls of rooms, offices, restaurants, hospitals, hotels etc. to provide a decorative surface. In this study, the radiation reduction effect of waste egg shells was investigated in order to... more
Wallpaper is pasted in vertical strips over the walls of rooms, offices, restaurants, hospitals, hotels etc. to provide a decorative surface. In this study, the radiation reduction effect of waste egg shells was investigated in order to reduce the radiation, especially in offices and hospitals. Writing and printing papers were used as balance (base) paper in wallpaper production and its physical and optical properties were determined. Base papers have been coated with mixtures of precipitated calcium carbonate (PCC) and egg shell calcium carbonate (ECC) at certain rates. In order to improve water resistance of wallpaper, PVA (polyvinyl acetate) was applied on the surface of the dried wallpapers in the conditioning room. The physical and optical of the papers were investigated to compare with each other. The results show that the whiteness values of the wallpaper increased with using PCC while decreased with using ECC. The brightness and yellowness values decreased not significantly and the physical properties of the wallpapers have decreased with coating process. As a result, waste egg shells were evaluated as a new raw material and water resistant wallpapers were produced.
Clay or other minerals are coated onto fibrous paper to improve print and optical properties. The minerals are fixed to the fibrous substrate with a binder, either latex or starch. The coated paper is dried during manufacture, and if the... more
Clay or other minerals are coated onto fibrous paper to improve print and optical properties. The minerals are fixed to the fibrous substrate with a binder, either latex or starch. The coated paper is dried during manufacture, and if the binder migrates during this drying, there can be a deterioration in properties. Not only are there manufacturing considerations as to the choice of binder, but also environmental ones with regard to factors such as the energy used in drying. This work reveals new perspectives on binder migration which have been gained by a variety of approaches. Firstly, a critique is presented of the experimental methods which have been used by other workers. Then a comprehensive series of experiments is described. For ease of study, and because any effects are likely to be exaggerated, most of the experiments were carried out on samples which were 1.4 mm thick, some two orders of magnitude thicker than commercial coatings. However, the results were also replicated in less extensive tests on samples of
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