1. Packaging for agricultural and industrial products
At present, due to the issue of product resources and prices, China has 6 billion woven bags used for cement packaging every year, accounting for more than 85% of bulk cement packaging. With the development and application of flexible container bags, plastic woven container bags are widely used for marine, transportation and packaging of industrial and agricultural products. In agricultural product packaging, plastic woven bags have been widely used for aquatic product packaging, poultry feed packaging, covering materials for farms, shading, windproof, hail proof sheds and other materials for crop planting Common products: feed woven bags, chemical woven bags, putty powder woven bags, urea woven bags, vegetable mesh bags, fruit mesh bags, etc.

The main foreign production is polyethylene (PE), while the main domestic production is polypropylene (PP), which is a thermoplastic resin made by polymerizing ethylene. In industry, it also includes copolymers of ethylene with small amounts of alpha olefins. Polyethylene is odorless, non-toxic, and feels like wax. It has excellent low temperature resistance (up to -70~-100 ℃ for low use), good chemical stability, and can withstand most acid and alkali corrosion (not resistant to oxidizing acids). It is insoluble in general solvents at room temperature, has low water absorption, and excellent electrical insulation performance; But polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and has poor heat aging resistance. The properties of polyethylene vary depending on the variety, mainly determined by its molecular structure and density. By using different production methods, products with different densities (0.91-0.96g/cm3) can be obtained.

In the relevant woven bag industry standards, the effective width deviation of woven bags has not been revised for bag widths of 700MM or less, and the original standard deviation of+15MM-10MM is retained; For sizes above 700mm, the allowable deviation will be relaxed to+20MM-10mm.
In the face of the trend of reducing the effective width and length deviations of relevant woven bag standards at home and abroad, the effective width and length deviations of the standards we have formulated have not decreased, but have increased for wide woven bags and long bags. This has been determined through repeated and careful discussions by the indicator group, based on the principle of seeking truth from facts.