In the United States and Japan, paper bags are the second only form of paper packaging to cartons. Paper bag is one of the oldest and most widely used packaging forms and has many advantages.
Convenience Among various packaging methods, paper bags are the simplest and most efficient ordinary packaging. In retail stores, salespersons can pack without skilled skills. The sealing operation of the bag mouth is simple, and the opening and retrieval is extremely convenient. The buyer can also do the packaging operation by himself.
Low price Among all packaging forms, except for packaging accessories such as straps, paper bags are undoubtedly the cheapest packaging containers, because paper bags have light weight and the cheapest shipping (except for heavy bag packaging).
The perimeter of the anti-pollution paper bag is completely closed, so it can effectively prevent dust and other harmful substances from polluting the contents. In addition, the harmful components in the paper are extremely small and will not pollute the contents, which is beneficial to food packaging.
The adaptability to the contents of the product is packaged in paper bags, and is not restricted by the shape of the product, and products of any shape can be packaged in bags.
Convenient to carry and transport Items packed in bags are very convenient to carry, transport, stack, store, and keep. After filling loose items, they can be placed upright, saving space.
Surface design The surface of the paper bag can be applied with various decoration designs, printing and coloring, etc., which can also increase the effect of product sales, advertising, and company promotion.
Discarded paper bags are easy to dispose. The bags can be reused after use, and can be recycled if they are not used. They are used as raw materials for paper making without causing pollution.
Of course, paper bags also have shortcomings: First, the paper bag itself is poor in self-supporting; second, it is poor in durability. If higher durability is required, paper materials with better performance can be used, and the cost will be slightly increased. In addition, convenient carton packaging is used to make up for the shortcomings of paper bags.
The paper bag material we use should preferably have the following properties: good moisture resistance, good flexibility, not easy to break, and also have renewable properties. In the past, kraft paper had better toughness; however, it had insufficient moisture resistance.
1. Types of commonly used paper bags
Envelope paper bag. The bottom does not form a plane, and it is often used to hold small and powdered goods;
Gusset bag. There are M-shaped crotch pleats on both sides, and the openings on both sides of the bag can expand the width of the crotch pleats. The bottom width of this bag is equal to the crotch width. After opening, a flat bag with the same bag length can hold more than twice as much stuff. , The most common in sales bags.
Square bottom bag and hexagonal bottom bag. Also known as self-opening bag, the bottom of the flat bag is folded and then glued into a bag with a square bottom or a hexagonal bottom seal. There is no crotch fold on both sides of the bag. This kind of bag can hold many things within the size range of the bottom surface.
The processing of the bottom of the bag is related to the position of the longitudinal seam of the bag body and the production method, and the manual and mechanism are generally different. This kind of bag is mainly used for packaging when selling goods.
Portable square bottom bag. The most common gift bags and shopping bags. It is generally made of kraft paper and white cardboard, which is relatively strong and comes with various handles.
2. The sealing of the bag mouth

All kinds of small paper bags should be sealed after filling the contents. The sealing methods include: folding and sealing, tape paper, labels, art paper labels, etc., pasted into a flat end; folding seal; metal strip sealing; rope ligation and other methods; sometimes it can double as a handle when using a rope ligation And for sealing.