Über den Einsatz natürlicher Binder bei der Papierherstellung und -veredlung

The Use of Natural Binders in Paper Making and Surface Applications. Binders are used in paper making for improvement of web strength and in surface operations – here particularly in coating – for gluing the pigments applied to the paper surface onto the same. As „natural binders”︁ those are meant here, which are of plant or animal origin and which are used as solutions or colloidal solutions. That is a distinct boundary towards the synthetic dispersions, which dominate the field today. Starch excels in economic importance among the natural binders. In order to strengthen the web structure cationic starches are used in the furnish. By the help of a size press the surface improvement of the paper can be done within the paper machine. Here native and degraded starches are predominant. In the case of paper coating fine pigment particles are applied to the paper surface in order to obtain a smoother paper surface with improved printability. The pigments must be held to the paper by a binder. Even as the use of starch for this purpose of pure binding power is more economic in comparison to synthetic latices, they are nevertheless here dominant. The reason for this are problems, which show up in printability of coated starch containing paper surfaces. They are reduced ink reception and migration of starch during drying of the coatings. It should be possible that in cooperation between the paper and the starch industry existing problems in the use of starch can be solved or diminished in order to obtain an increased application of starch in the paper industry in the future. This, in the case of market acceptable prices, would be in the interest of both industries.