What can paper bags be classified by material?

According to material, it can be divided into: white cardboard paper bags, whiteboard paper bags, copperboard paper bags, kraft paper bags, and a small amount of special paper manufacturing. 

White cardboard: White cardboard is strong and thick, with high stiffness, durability, and smoothness. The paper surface is flat, and the commonly used thickness is 210-300 grams of white cardboard. The most commonly used is 230 white cardboard. The paper bag printed on white cardboard has a full color and excellent texture, making it your preferred choice for customization. 

Copperplate paper: The characteristics of copperplate paper are that the paper surface is very smooth and flat, with high whiteness, smoothness, and good glossiness. It also gives the printed graphics and images a three-dimensional sense. The commonly used thickness is 128-300g. The printing effect of copperplate paper is the same as that of white cardboard, with full and bright colors. Compared with white cardboard, the stiffness is not as good as that of white cardboard. 

White kraft paper: White kraft paper has high burst resistance, good toughness, high strength, uniform thickness, and stable color image. According to relevant national regulations, supermarkets are restricted from using plastic bags, as well as the trend of promoting the use of environmentally friendly paper bags in foreign countries, Europe and America. Plastic pollution is strictly controlled, and plastic bags will be replaced by environmentally friendly paper bags. The market prospects for white kraft paper are promising. Made of 100% pure wood pulp, environmentally friendly and non-toxic, it can be recycled and reused. White kraft paper has good toughness and does not require lamination. It is widely used to make environmentally friendly clothing handbags, high-end shopping bags, etc. The commonly used thickness is 120-200 grams of white kraft paper, which lacks brightness and gloss. White kraft paper is not suitable for printing content with too much ink. 

Kraft paper: also known as natural kraft paper. It has high tensile strength, toughness, and is usually brownish yellow in color. It has high tear resistance, rupture strength, and dynamic strength, and is widely used in shopping bags, envelopes, and other materials. The commonly used thickness is 120-300 grams of natural kraft paper. Kraft paper is generally suitable for printing single or dual color and non complex color manuscripts. Compared to white cardboard and white kraft paper box copperplate paper, yellow kraft paper has the lowest price. 

Gray background whiteboard paper: Whiteboard paper is a type of cardboard with a white and smooth front and a mostly gray back. The commonly used thickness is 250-350 grams. Whiteboard paper is white on one side and gray on the other, making it relatively cheaper than white cardboard. 

Black cardboard: A special type of paper with double-sided black. The characteristics of black cardboard are delicate paper, transparent black, firm and thick, good folding resistance, smooth surface, good stiffness, good tensile strength, and high burst resistance. The commonly used thickness is 120-350 grams of black cardboard. Because black cardboard is black both inside and outside, it cannot print colored patterns and is only suitable for processes such as hot stamping and silver stamping. The bag made is also very beautiful. 

There are four types of paper bags, including open seam bottom bags, open adhesive corner bottom bags, valve type suture bags, and valve type flat hexagonal end bottom adhesive bags, depending on the bag edge, bottom, and sealing method.