Production process flow of ton bags

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After the raw materials are mixed in proportion, they are processed through processes such as drawing, circular weaving, cutting, sealing, and packaging to produce ton bags with a thickness of 0.025mm or more. The process flow is as follows:

（1） Wire drawing: The wire drawing production line includes a spiral feeding machine, a wire drawing machine, a cooling water tank, a traction machine, and a receiving machine

The winding machine and other parts. Firstly, the purchased raw materials polypropylene and anti-aging and anti purple agent masterbatch are proportioned and fed into a sealed mixer (with an internal temperature of about 200 ℃) through a screw elevator. After about 15 minutes of stirring, they are evenly mixed and then melted through a screw elevator into a wire drawing machine. The melted raw materials are extruded into thin films from the wire drawing machine and cooled in a cooling water tank.

The cooling method adopts direct cooling. The polypropylene film enters a cooling water tank with a volume of about 0.9m3 through a traction roller for cooling and solidification. The cooling circulating water flows into the circulating water tank on the northeast side of the factory for cooling, and then flows back to the cooling water tank for continued use.

The cooled polypropylene film is cut on a drawing machine and then stretched by multiple traction machines to meet the requirements of product thickness and width, and to enhance the toughness of the product. The end is wound into wire ingots by a winding machine for subsequent processes.

（2） Circular weaving: The silk processed by the drawing process is woven into cylindrical woven bags using four circular weaving machines in the circular weaving workshop, and then rolled before continuing production in the next process.

（3） Cutting: Cut according to customer's different size requirements.

（4） Sealing: The cut woven bag is sewn to the bottom using a specialized sewing machine, and the sealing strip is used to seal the bottom part of the seam, further improving the sealing performance of the product.

（5） Packaging: Pack and compress the manufactured ton bags to reduce the space occupied by the product, making it easier for subsequent storage and transportation.

Attention: There is no production wastewater during the bag making process. The noise mainly refers to the mechanical noise generated by production equipment during operation, which ranges from 55 to 70dB (A); Solid waste mainly refers to the scraps generated during the cutting process; The exhaust gas is mainly organic waste gas generated during the wire drawing process.

2、 Blowing film production process flow

At the request of the customer, some ton bag products need to add a waterproof layer on the inner side, that is, add a layer of waterproof film, which is produced through blowing film technology. The raw materials are heated by the feeding machine and then enter the machine to be processed into finished films through processes such as film blowing and cutting. The process flow and pollution generation process are as follows:

（1） Blowing film: Polypropylene is heated by a feeding machine (at a temperature of about 200 ℃) and melted before entering the machine. It is vertically stretched upwards into a cylindrical film by an upper traction machine. After natural cooling, it is rolled and stored.

（2） Cutting: The film is cut according to the customer's size using a cutting machine.

Attention: The blown film process does not produce production wastewater. Noise mainly refers to the mechanical noise generated by production equipment during operation, which ranges from 55 to 70dB (A); Solid waste mainly refers to the scraps generated during the cutting process.