PP (polypropylene) is the main material for woven bags. Typically, fiber-grade PP is chosen, with small amounts of fillers and antioxidants added to enhance its performance. This material has high strength and chemical resistance, making it suitable for various types of woven bags. Besides using virgin polypropylene raw materials, some manufacturers also use recycled materials to make woven bags. Recycled materials are usually washed, crushed, melted, and then reprocessed into woven bags. This practice not only saves resources but also reduces environmental pollution.
When selecting polypropylene materials, manufacturers usually determine the proportion of fillers and antioxidants based on the intended use environment and requirements of the woven bags. For example, when making outdoor woven bags, the proportion of antioxidants may be increased to improve their aging resistance; while when making woven bags requiring chemical resistance, the proportion of fillers will be increased to enhance their chemical resistance. The ratio of fillers and antioxidants is adjusted according to the specific application scenario to meet the needs of different customers.
The proportion of recycled materials used also depends on the quality and performance requirements of the raw materials. Generally, the proportion of recycled materials is not very high, usually between 20% and 50%. If the raw material quality is good, the proportion of recycled materials can be increased appropriately, but if the raw material quality is poor, the proportion of recycled materials needs to be reduced to ensure the performance of the woven bags.
It is important to note that whether using virgin raw materials or recycled materials, manufacturers strictly control the quality of the materials to ensure the performance and safety of the final product. Furthermore, using recycled materials to make woven bags also helps promote sustainable development and reduce environmental impact.