Recently, about 300 billion kilograms or more of grain is purchased and sold every year in China, mainly relying on large packaging (100 kg or more) and medium packaging (25 kg). Due to backward packaging (sacks, cloth bags, plastic woven bags), transportation, broken bags, moisture, pollution, deterioration and other serious losses, post-production losses accounted for 7.5% of total output, which accounted for 5% of poor packaging and transportation, annual loss of food hundreds of Billion kilograms. Rice is packed in sacks and it is difficult to distinguish grain varieties. There is no trademark, quality, or quantity identification. It is impossible to establish a corporate image and is not conducive to competition. It is not conducive to consumers' purchase. Flour is packed in sacks, requires a lot of high-quality cotton, and is expensive. Bags are used repeatedly, causing confusion to the brand and causing pollution. According to the statistics of the grain department, the grain sector alone has 880 million sacks and 3.7 billion yuan of funds. In recent years, almost all of the grain packaging that appears on the market in China is plastic, and there are no poor quality plastic woven bags. Although the plastic woven bags have the characteristics of high strength and can reduce the damage, there are problems such as leakage, infiltration of soil, insects, and water, which can easily cause food insects, mildew, and deterioration, and the shelf life is short, and the plastic itself is released. Harmful substances can contaminate food, affect human health, and are not easily recycled, causing environmental pollution.
At present, the international market has begun to restrict the plastic packaging of food. The grain sales and packaging in developed countries such as Japan, the United States, France, Italy, and Germany are mostly paper bags, among which small packages account for 80% of the food grain package.
In addition to its general requirements, food packaging bags must consider the moisture content of food, the respiration of food, the condensation of food, etc., in particular, the water-absorption mildew of flour, in proportion to the characteristics of foodstuffs and requirements for packaging materials. The variability, electrostatic adhesion, easy contamination, aging, and oxidative fading. Therefore, the state puts forward the use of high-strength, non-toxic and odorless surface-fold paper as the substrate for food packaging materials, especially flour packaging materials. This is based on the experiences of developed countries and is formulated in accordance with the specific conditions in China.
Now widely used in plastic packaging bags, will be gradually replaced by paper bag packaging, such as new reinforced paper packaging bags, its high strength, non-toxic, odorless, non-polluting, recyclable, in line with national food hygiene standards, and The cost is low and the production process is simple.
Paste multilayer paper bags. It is generally made of 3 to 4 layers of paper bag paper or stretch paper. Its structure is scientific and reasonable, high strength, non-toxic, tasteless, non-polluting, recyclable and in line with national food hygiene standards.
The bottom side of the food packaging paper bags has also shown its superiority, and gradually replacing the plastic film bag packaging food has become a trend.
At present, China's high-strength face-knitted paper and paper packaging adhesives that meet the requirements of food hygiene have been successfully tested and put into production. The special bag making equipment has been successfully developed. All this has created favorable conditions for the development of grain paper bags.
