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Let ’s get to know the paper briefly:
Commonly used papers include gold and silver cardboard, white cardboard, coated paper, kraft paper, oil-proof, double-coated paper, writing paper, newspaper printing paper, corrugated cardboard, etc.
The Shanghai brand cigarettes use gold cardboard. There is gold tin foil on the surface, and silver tin foil on the surface similar to gold.
KFC McDonald's box for burgers is white cardboard. The small paper bag with chicken wings inside is oil-proof paper, which can be oil-proof. Of course, the oil-proof performance is good or bad. The paper for burgers is PE paper. The color brochure is usually printed with 128g coated paper. of.
Of course, there are single copper. Generally, the pizza boxes are E corrugated paper, and the big cardboard boxes are corrugated. The corrugation is different from single tile and double tile.
Briefly talk about the structure of the paper:
Paper is composed of multiple layers, each layer is composed of different wood pulp, and wood pulp can be divided into mechanical pulp and chemical pulp and mechanical plus chemical pulp (BCTMP pulp).
Let's take white card as an example: white card paper can be divided into yellow core white card and white core white card. Yellow core white card consists of 4 layers, the middle layer is mechanically ground wood pulp, the upper and lower layers are chemical pulp, and then the surface is coated.
The middle layer of white core white card is chemical pulp or BCTMP pulp. You can tear open the jammed paper to see if it is yellow in the middle, it is yellow core and white card. If it is white, it is of course white core and white card.
Whiteboards with white background and whiteboards with gray background are mostly made of poor pulp or recycled pulp (that is, pulp made from recycled paper) and then coated on the surface.
Comparing different types of paper
Compare the price of the same raw material in the same factory with the same process:
White core white card> Yellow core white card> White board on white background> White board on gray background
Comparison in stiffness:
Yellow Core White Card> White Core White Card> Whiteboard on White
other
Another talk about the whiteness of paper:
The white color of the paper can be divided into yellow-white, blue-white and red-white. Among them, blue and white are the whitest in human vision. So when you see why the paper is yellowing, do not blindly think it is caused by too long time.
Two common products require cardboard:
â‘ Foods --- have good adaptability in printing and packaging production lines, high stiffness, low odor and less stain, hygiene and cleanliness, high whiteness, waterproof and oil-proof
â‘¡Skin care products --- high brightness, high whiteness, coated blue tones on the surface, smooth surface, no paper dust, no deformation of paper, good printing adaptability on the back, high stiffness, good foldability.
So you can choose paper according to your product requirements.