According to the packaging capacity and purpose, it can be divided into large paper bags and small paper bags. Small paper bags are often used in some retail stores, and large paper bags are mostly used as stake containers for bulk powder and granular products. Different paper bags have different uses.
Food paper bags can be divided into envelope type, flat bag type, square bottom bag type, hexagonal bottom bag type, portable square bottom bag type, etc. in terms of structure and shape. The sealing methods are mainly divided into bonding, sewing, tape sealing, nail sealing and hot pressing sealing. According to the classification of bag filling methods, small bags are prefabricated bags and bag making, filling and sealing bags.
Prefabricated bags are formed by hand or bag making machine before packaging, and are supplied by bag making factories or bag making workshops. When filling materials, the bag mouth needs to be opened first, and then sealed after filling.
Bag-making, filling and sealing bags are printed and cut packaging paper provided by the packaging material factory. The bag-making process is completed continuously on one machine with filling and sealing. Paper bags are made of paper as the main raw material. In addition to having good strength, folding resistance, moisture permeability, etc., they also have excellent packaging adaptability, printability and economy.
As a paper container, paper bags are easy to process and form, with a high degree of automation and easy container opening. The waste after use is easy to handle and can be naturally degraded and disappeared in a short time under the action of light and microorganisms.
Therefore, paper bags have a wide range of uses. Bag-making, filling and sealing bags are included in the scope of food packaging paper products in the food paper packaging material unit. The scope of paper bag products included in the implementation of production license management is paper bags, coated paper bags and waxed paper bags.
