subject: Corrugated Knowledge: Corrugated Board Raw Material (below) - Corrugated, Corrugated Board, [print this page] The distinction between paper and cardboard
Divided according to their thickness of paper and cardboard, the square area will be used on the weight of more than 200g of thick as cardboard, less than 200g weight as paper. However, with the mechanical equipment, materials and technology improvements to improve, there is also known as light corrugated cardboard tissue paper and cardboard, the scope of more than 200g of the secular provisions of the production machinery is also divided into heavy and light corrugated corrugated board production line cardboard production line, the company's three existing production lines belong to the light cardboard cardboard production line.
Paper and cardboard are now about 5,000 in the world, China's production of paper and cardboard existing 500-600 species, the main species used for packaging are cardboard, corrugated paper, white paper, yellow paperboard, kraft paper , glass cardboard, tar paper, copperplate paper, plastic sheet of paper, coated paper, specialty paper, plastic coated base paper, etc., while the major manufacturing corrugated cardboard and corrugated paper are two.
Paper or cardboard identification of positive and negative
Either paper or cardboard are divided into positive and negative, in papermaking, the wet paper web contact surface to increase and negative, the other side is positive. Negative due to copper network access, fine fiber and filler loss of more, showing the screen printing, so the opposite is more rough. Face more closely to the nature of positive and negative significant differences. Its smoothness, more positive than negative high picking speed has more negative than positive; white spots better negative than positive, so paper and board has two sides.
Two sides of the print quality greatly. Typically, the smoothness positive, both good degree of sizing, so the printing performance . Cartons of tissue paper making, paper must face outwards to be moisture-proof printing and processing, this paper or paperboard must identify positive and negative.
For linerboard, the color of the batter slurry than in the color well and is easy to identify the most negative, and some paper or cardboard is a multi-cylinder paper machine forming, or through the press-ray machine calendering, the surface anyway, the difference between less obvious, at this time can use the following methods that can identify:
1, direct observation method. Folding of paper or cardboard to observe the surface shape of the structure on both sides. If screen printing machine, a screen printing surface is negative, when naked eye is not clear, it can take a magnifying glass, or smooth instrument measurement.
2, press the paper with carbon paper, observation method. The pressure of carbon paper on paper, and then observe the situation on paper to make a mark on paper, so that pressure traces of carbon paper on paper, can be drawn about wide 13?, Long 51-76?'s A black mark observed, it can be placed on a smooth glass surface by a method identification.
3, with the coin method (aluminum) marking. The paper folded so that both sides placed on a flat surface, flat on both sides of a coin in the traces, and then observe the signs of the depth on both sides, traces of light as the negative side, this is because the net surface of the packing is low, scratches easily show .
Paper or cardboard vertical and horizontal differentiation
Paper and cardboard, there may be formed by screen printing direction, generally running parallel to the direction and cardboard for the vertical, and running perpendicular to the horizontal.
Aspect to the usually several ways you can identify with.
1, visual method. Some flat-panel monitor will be able to tell a little paper of vertical and horizontal, facing the light look more obvious, along the fiber orientation is vertical. Intersect at the longitudinal web direction of its length.
2, tearing method. If by visual assessment is difficult to determine vertical and horizontal direction, the cardboard can be torn by hand, if the rip straight, smooth, compared to vertical; if the gap was jagged oblique or even tear the paper rip Department level to, compared to horizontal. Or by paper, paper to distinguish, namely tensile strength of the vertical.
3, tension measurement instruments: using a dedicated testing machine to test a large numerical value for the small vertical to horizontal.
