The most popular raw material of corrugated board

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Raw material of corrugated board (Part 2)

distinction between paper and paperboard

it is divided into paper and paperboard according to its thickness. It is customary to call thick paper with a weight of more than 200g on the square area as paperboard, and paper with a weight of less than 200g as paper. However, with the improvement of mechanical equipment, materials and process technology, thin paper paperboard, also known as light corrugated paper and paperboard, has emerged. Its scope has exceeded the secular provisions of 200g. In terms of production machinery, it is also divided into heavy corrugated paper production line and light corrugated paper production line. The three existing paperboard production lines of our company belong to light paperboard production line

there are about 5000 kinds of paper and paperboard in the world that need to exit the software first and then close the equipment. There are kinds of paper and paperboard produced in China. The main varieties used for commodity packaging are carton paper, corrugated base paper, white board paper, yellow board paper, kraft paper, glass paperboard, asphalt paper, copper board paper, offset paper, coated paper, special paper, adhesive coated base paper, etc. the main tensile strength, constant elongation, constant elongation force value The yield strength should be box board paper and corrugated base paper

identification of positive and negative sides of paper or paperboard

no matter what kind of paper or paperboard, there are positive and negative sides. When making paper, the wet paper and the contact surface are the negative side, and the other side is the positive side. On the reverse side, because the upper and lower jaw divergent centers are in contact with copper, there is a lot of loss of fine fibers and fillers, showing printing, so the reverse side is rough. The obverse is relatively close, and the properties of the obverse and the reverse are obviously different. Its smoothness is higher on the front than on the back, and the galling speed on the back is higher than on the front; The negative side of the white dot is better than the positive side, so paper and paperboard have two sides

the two sides have a great impact on the printing quality. Generally, the smoothness and sizing degree of the front are good, so its printing performance is also good. When making the face paper of the carton, the front side of the paper must face outward for printing and moisture-proof treatment. Therefore, the front and back sides of the paper or paperboard must be identified

for the vermicelli paperboard, the color of the surface pulp is better than that of the inner pulp, and the front and back sides are the easiest to identify. Some papers or paperboards are made by multi cylinder paper machines or polished by calenders, and the difference between the front and back sides is not so obvious. At this time, the following methods can be used for identification:

1. Direct observation method. Folding paper or paperboard can be seen as further promoting the scientific and technological innovation and industrialization development in the field of materials in China. If there is a paper machine print, the printed surface is the reverse side. When it is not clear with the naked eye, it can be measured with a magnifying glass or a smoothing instrument

2. Carbon paper pressing observation method. Press the carbon paper on the paper surface, then observe the paper surface and make a mark on the paper, so that the trace of the carbon paper is pressed on the paper, and the width can be about 13?, Long? A black trace of can be placed on a smooth surface glass for identification according to method 1

3. Mark with coin method (aluminum). Fold the paper so that both sides are placed on a plane, draw a mark on both sides with a coin, and then observe the depth of the marks on both sides. The side with a shallow mark is the opposite side. This is because the amount of filler on the surface is low, and the scratches are not easy to show

longitudinal and transverse identification of paper or paperboard

paper and paperboard have certain directionality after printing. Generally, those parallel to the running direction of paperboard are longitudinal, and those perpendicular to the running direction are transverse

vertical and horizontal directions can usually be identified by the following methods

1. Visual inspection. Some flat paper can distinguish the longitudinal and transverse directions with a little attention. It is obvious when facing the light. It is longitudinal along the fiber arrangement direction. The length direction of the web is longitudinal

2. Tear method. If it is difficult to determine the vertical and horizontal directions by visual inspection, the paperboard can be torn by hand. If the crack is straight and smooth, it is longitudinal; If the crack is oblique or serrated, or even the paper layer is torn out at the crack, it is horizontal. Or it can be distinguished by paper strip and paper. The one with high tensile strength is longitudinal

3. Tensile instrument measurement method: use a special tensile testing machine to conduct the test. The large value is the longitudinal value, and the small value is the transverse value

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