Elastic and plastic factors of printed paper

Elastic and plastic factors of printed paper

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Elasticity and plasticity of printed paper: Paper changes in various processes such as raking and printing, depending on the surrounding environment. If it is under the action of external force, it will change its shape and size instantaneously. When the external force stops, the paper will return to its original shape and size. The process of deformation is called elastic deformation; when the paper is subjected to external force Changed its shape and size within a certain period of time. When the external force stops, it slowly returns to its original shape and size. The process of deformation is called hysteretic deformation. When the external force is canceled, the paper remains in the subject. When the shape and size are deformed by an external force, it is called plastic deformation. Sensitive elastic deformation and hysteretic deformation are reversible deformations, and plastic deformation is irreversible deformation.

Surface strength of the paper: The surface strength of the paper determines the decisive influence of the surface on the surface of the paper during printing, such as abrasion resistance, anti-powdering, and anti-pilling. In order to get a clearer dot during printing, some inks with higher viscosity will be used. If the surface strength of the paper is insufficient, it will easily fall off the powder and lint, and adhere to the surface of the plate; if a lower viscosity ink is used In lithography, the ink and the fountain solution are emulsified, which causes the printing plate to be dirty.