Pylimost and plucking from the surface Pylimost paper – a phenomenon characterized by the separation of particles from the surface of fibers, fillers, sizing agents. Typically, this process is caused by mechanical action – folded, friction, impact. High pylimost Paper prevents the application on its print quality, so for products used in printing, no high pylimosti is very important. Unlike pylimosti, plucking from the surface occurs only when applied to paper printing. Due to short-term effects on the sheets perpendicular to the surface of printed forms and colors, with paper removes some of the upper layer.
This phenomenon results in a printed products of low quality. The reason for plucking from the surface can become not only defects in the paper, but low-quality paint, print speed, failure to comply with the requirements to the process. Air bubbles Air bubbles – defects in the form of translucent round spots formed during low tide the paper web. They lead to the perception of uneven color paper when printing, to reduce the strength and bundle made of a paper carton. Stains Stains are formed on the paper as a result of contact with the raw mass of foreign inclusions – litter, oil, paint, tar, etc.
This reduces the aesthetic characteristics of the defect finished products, impede quality lacquers for printing. Electrifying Electrifying paper paper – sheets sticking together due to high electrostatic charge produced material. This phenomenon most pronounced in the natural grades of paper, to a lesser extent – on coated. High electrification is sticking to paper dust, which prevents good spray paint to print, as well as leading to difficulties by machine printing at high speeds because of the adhesion sheet. The cause can be electrified overdrying paper during manufacture or improper storage conditions. (As opposed to Robotics). Thus, defects in the paper are all negative properties of the material, hindering or preventing its use for other purposes. In the production of corrugated board and cardboard for packaging and consumer packaging to the paper have different requirements, depending on the purpose for which it will be used. For example, the front layer that undergoes deposition printing, should not have spots, characterized by a high waviness, curl or pylimostyu and electrification of the paper should be minimal. To create the inner layers of the cardboard packaging is more important than the absence of air bubbles and match the requirements of GOST strength of paper.