Mechanical Properties of Free Standing Pigmented Coating Layers With Latex and Starch as binder: Bending ,Tensile and Picking Properties, PaperCon2017

The mechanical properties of coating layers influence the printing and converting of paper and paperboard.  Mechanical testing of coating layers have been limited to tensile tests.  The influence of these properties on picking during printing is not clear.

The mechanical properties of free standing coatings layers were characterized. Free standing films with two types of binder formulations, pure latex and latex-starch, with different content were prepared through an innovative film forming method. Tensile and flexural samples were cut out of these films. Tensile and bending tests were carried out on samples and compared. Tensile and flexural moduli were similar but substantial differences were observed in stress at failure and strain at failure between the flexural and tensile tests. One sample had different flexural properties depending on the direction of bending; this may be linked to some non-uniformity of the film that is generated in the method to prepare the film. Three different types of paper coated with these formulations and their picking properties were evaluated with picking test. Different types of papers have different picking properties but in general they showed a similar trend of picking in all the coating and formulations content, which was not affected by the coating layer mechanical properties.   

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