Physical and Mechanical Properties of The Unbleached Kraft Papers Coated with Different Biopolymers

Abstract

Plastic film coatings have been used for production of packaging material for many years. It is important to ensure that the material used in food packaging does not contain chemicals that may harm human health. In this study, unbleached kraft hand sheets were coated with gelatin and sodium alginate based biopolymer solutions prepared using glycerol additive as plasticizer. The brush coating method was used to apply the prepared dispersions on the papers. Tensile, tear, burst indexes as mechanical properties and COBB, air permeability tests as physical properties were determined. All mechanical properties of the papers produced with both gelatin and sodium alginate coatings have been improved. Compared to the control papers, it was observed that the water-repellent properties of the paper coated with gelatin increased and the water-absorption properties of the papers coated with sodium alginate were increased. While air permeability of gelatin coated papers decreased compared to control samples, it was determined that there was no air permeability in sodium alginate coated papers. As a result of the study, the desired mechanical and physical properties for packaging papers were improved.

Keywords

• Coating
• kraft paper
• sodium alginate
• gelatine
• food packaging papers

Farklı Biyopolimerler ile Kaplanmış Ağartılmamış Kraft Kâğıtlarının Mekanik ve Fiziksel Özellikleri

Abstract

Plastik film kaplamalar uzun yıllardır ambalaj malzemesi üretiminde kullanılmaktadır. Gıda ambalajlarında kullanılan malzemenin insan sağlığına zarar verebilecek kimyasallar içermemesine dikkat edilmelidir. Bu çalışmada, ağartılmamış kraft test kağıtları, plastikleştirici olarak gliserol katkısı ile hazırlanan jelatin ve sodyum aljinat bazlı biyopolimerik çözeltiler ile kaplanmıştır. Hazırlanan dispersiyon çözeltilerinin kağıtlara uygulanması için sürme yöntemi kullanılmıştır. Mekanik özellikler olarak çekme, yırtılma, patlama indisleri ve fiziksel özellikler olarak COBB, hava geçirgenlik testleri belirlenmiştir. Hem jelatin hem de sodyum aljinat kaplama ile üretilen kağıtların tüm mekanik özellikleri iyileştirilmiştir. Kontrol kağıtlarına göre jelatin kaplı kâğıtların su itici özelliğinin arttığı, sodyum aljinat kaplı kağıtların ise su absorblama özelliğinin arttığı gözlenmiştir. Jelatin kaplı kağıtların kontrol örneklerine göre hava geçirgenliği azalırken, sodyum aljinat kaplı kağıtların ise hava geçirgenliğinin hiç olmadığı belirlenmiştir. Yapılan çalışma sonucunda ambalaj kağıtları için istenilen mekanik ve fiziksel özellikleri iyileştirilmiştir.

Keywords

• Yüzey kaplama
• kraft kağıdı
• sodyum aljinat
• jelatin
• gıda ambalaj kağıdı

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