Explain the definition of gray-backed white cardboard rolls

oll gray-backed cardboard is a kind of white linerboard with 2-3 layers of structure. It is a relatively high packaging cardboard. It is mainly used for sales packaging and is made into various types of cartons after color printing. The box plays the role of protecting products, decorating and promoting products, and may also be used to produce clothing hangtags, linings and the base plate of blister packaging plants. Rolled gray-backed white cardboard is also known as San Francisco paper. Rolled gray-backed white cardboard is used to print educational photos of children and logos of daily necessities, skin care products, and medicines. The basis weight is 200g/m2 to 400g/m2. The thickness is consistent, it does not pill or powder, it is malleable, and it is not easy to break when it expands and contracts.

1. Functions of gray-backed white cardboard rolls:
The gray-backed white cardboard roll has printing, processing and packaging functions. Rolls of gray-backed white cardboard are divided into double-sided rolls of gray-backed white cardboard and single-layer rolls of gray-backed white cardboard. The low-layer material of double-sided rolls of gray-backed white cardboard is the same as the top layer. Double-sided rolls of gray-backed white cardboard are only used for It is only used for high-end product packaging. Some cartons are mostly made of single-layer gray-backed white cardboard, such as outer packaging boxes for tobacco, skin care products, medicines, food, stationery and other products.

2. The structure of the gray-backed white cardboard roll:
The gray-backed white cardboard roll is composed of surface layer, blockboard and layer. When producing roll gray-bottom white paperboard, bleach pulp, fiber tube mechanical pulp, secondary fiber pulp or other unbleached and semi-bleached pulp are used for the surface and layer. Products are produced from 3 to 6 layers or even double layers. The bleach pulp of some surface layers requires a certain degree of glue adjustment and packaging and printing adaptability.

Roll gray-backed white cardboard is a kind of linerboard produced by a rotary screen paper machine. Filling material is added to the slurry, and the basis weight is 150g/㎡ or higher. Different grades of gray-backed white paperboard have different intrinsic qualities such as color, smoothness, tensile strength, and bursting resistance.