Practical paper knowledge of printers
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Commonly used papers are gold and silver cardboard, white cardboard, coated paper, kraft paper, oil-proof, double-adhesive paper, writing paper, newspaper printing paper, corrugated cardboard and so on.
Paper is composed of a multi-layer structure, each layer consists of different wood pulp, and wood pulp can be divided into mechanical pulp and chemical pulp and mechanical plus chemical pulp (BCTMP pulp).
We take white card as an example: white cardboard can be divided into yellow core white card and white core white card. The yellow core white card is composed of 4 layers. The middle layer is mechanically ground wood pulp, the upper and lower layers are chemical pulp, and the surface is coated.
The white core white card intermediate layer is chemical pulp or) BCTMP pulp. You can tear open the cardboard and look at it. If the middle is yellow, it is a yellow core white card. If it is white, it is of course a white core white card.
White whiteboards and gray-bottomed whiteboards are often made of poor pulp or recycled pulp (ie, pulp recycled from recycled paper) and the surface is recoated.
price comparison:
White core white card > yellow core white card > white white board > gray white board
Comparison of stiffness:
Yellow core white card> white core white card> white board
Paper whiteness:
The white color of the paper can be divided into yellow white, blue white, red and white. Among them, the blue and white are the most white in human vision. So when you see why the paper is yellow, don't just think that it is time to put it too long.
Cardboard requirements for two common products:
1.Food---Good compatibility in printing and packaging production line, high stiffness, low odor and less stain, hygienic and clean, high whiteness, waterproof, oil proof
2. skin care products---high brightness, high whiteness, blue coated surface, smooth surface, no paper dust, no deformation of paper, good printing adaptability on the back. High stiffness, good folding.