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The Manufacturing Process of PP Woven Bags
2025-03-04
Ⅰ.What is the specific production process of pp woven bag
A.Raw materials of pp woven bag
The main raw material for the manufacture of PP woven bags is polypropylene particles, which look like small white or transparent plastic particles, which are the basis of the tough quality of woven bags. In addition to PP particles, a variety of additives need to be added. The anti-aging agent can effectively prevent the bag from becoming brittle after sun exposure and prolong its service life; The masterbatch gives the bag rich colors, such as the common red, blue and so on.
B.Weave the drawn wire into pp fabric.
The flat silk is wound around the spindle like a ball of wool woven into a sweater. Then, using a circular or flat loom, the flat silk is interwoven into a "plastic sheet". The circular loom can weave a cylindrical shape of cloth, which is more economical in making bags directly. The flat loom, on the other hand, produces flat fabric, which needs to be stitched later.
C.Coating or lamination of pp woven bag
Ordinary woven bags do not have waterproof properties themselves, in order to enable them to be used in humid environments, such as packaging fertilizer, they need to be coated or laminated. The common way is lined with PE film, and pasted with a layer of polyethylene film by hot pressing, just like wrapping a layer of plastic wrap on a bag; Or the outer coating of PP coating not only enhances the water resistance, but also makes the surface of the bag more smooth.
D.pp woven bag of printing pattern
First design the pattern template that contains the brand LOGO, product information and so on. Then, using a gravure press, the ink is accurately printed on the bag, so that the bag is not only practical, but also has the function of brand promotion and product identification.
E.Cutting and sewing
According to different specifications, such as 50kg bag, 25kg bag, etc., the woven fabric is cut. Then sew the bottom and sides through a sewing machine, and some use heat seal bonding. For some bags that need to be carried or lifted, a handle or sling will also be installed, like a ton bag, which needs to be strengthened to ensure its carrying capacity.
Ⅱ.PP woven bag environmental protection and common problems？
Although PP woven bags bring us a lot of convenience, but there are also some problems. From the perspective of environmental protection, although PP is a recyclable material, it needs to be strictly classified during the recycling process to avoid mixing with other garbage and affecting the quality of recycling. At present, some factories use "recycled PP particles" to reduce production costs, which reduces resource waste to a certain extent. In the production process, there will also be some common defects. For example, uneven weaving can make bags prone to holes; Poor adhesion of the film will make the waterproof effect ineffective; Misalignment will affect the overall appearance of the bag.
Ⅲ.Conclusion
The main reason why PP woven bags are favored is that they are cost-effective. It costs less than sacks and paper bags, but has excellent durability, good tensile and moisture resistance, and can be reused. In addition, PP woven bag empty bag light weight, in the transportation process can save freight, reduce logistics costs.
The manufacturing process of PP woven bags, from the initial plastic particles, through a series of fine steps such as melting, drawing, weaving, sewing, and finally become the strong and durable bags we are familiar with. It plays an integral role in our lives and industrial production, and will continue to rely on its advantages to provide reliable packaging solutions for various fields in the future.