Amazing Process Of Making PP Woven Bags in Factory | How To Manufacturing Woven Bags
Polypropylene woven bag production process polypropylene woven bag complete production line includes: drying mixer, drawing unit, winding machine, circular loom, printing machine, bag cutting machine, sewing machine.
1. Raw material proportioning process
According to customers' quality requirements, different raw material ratios can be selected. However, if it is used for food, it is not allowed to use recycled materials, and the filling masterbatch should not exceed 8%. In general, the recycled materials should be added at most 30-40%[1]. 10-15% of the filler masterbatch is appropriate, more than 20-25% will cause the relative tensile strength of the flat wire to be lower than the national standard GB/T8946. As the filling amount of the filler masterbatch increases, the tensile strength of the flat yarn will gradually decrease; this is because the main component of the filler masterbatch is calcium carbonate. After a small amount of the filler masterbatch is added, it will be dispersed in the gaps of the polyolefin polymer chain. Among them, it has little effect on the tensile strength of the flat yarn, and the rigidity of the flat yarn is improved. When the addition amount exceeds 20-25%, the filler masterbatch will be excessive and occupy the position of the polymer chain, thereby hindering the elastic deformation of the polymer, making the polymer chain unable to be fully stretched under the action of the longitudinal external force, which affects the stretching of the polymer chain. Stretching orientation results in a significant decrease in the strength and rigidity of the flat wire, and the relative breaking force of the flat wire is lower than the national standard GB/T8946.
1.2 Mixing process
When mixing new and old raw materials, pay special attention to the uniformity of mixing, and at the same time, try to select raw materials with similar melt indexes for mixing. If the melt index of the raw materials differs too much, the melting temperature will differ greatly. During the plasticizing and extrusion process, the plasticization can not be uniform at the same time, which will seriously affect the stretching and cause the quality of the flat yarn to decrease. At the same time, the broken wire rate and the reject rate are high. Production [3]. During the mixing process, pay attention to the drying time and temperature of the raw materials. The mixing situation of Guangxi Huasu Group Co., Ltd.: mixing power 37.5KW, feeding 125kg, drying time about 20min, and drying temperature about 100℃.
1.3 Wire drawing process
The drawing process is the most critical link in the production of Polypropylene woven bag, and it has a huge impact on the quality of Polypropylene woven bag.
1.4 Wire drawing process
The wire drawing process route is: after the raw material enters the extruder, it is heated by the barrel and the mutual shearing action of the screw and the barrel, and becomes a molten state in an almost completely plasticized state, and is extruded into a film through a die. After cooling, it is cut into embryo silk with a blade, and stretched in an oven to form a flat yarn; the flat yarn is heat-set, shrinks at a low traction speed, and processed at low temperature, and finally reeled into a winding system. The film forming methods of the wire drawing process include tube film method and flat film method. At present, the flat film method is mostly used; the cooling methods after film formation include air cooling, water cooling and indirect cooling, and the water cooling method is more commonly used. ; Draft heating methods include hot plate, hot roller, and hot air. At present, the hot plate method is more commonly used; winding forming includes concentrated cycloid winding, single-spindle torque motor winding, magnetic torque winding and cam combined energy saving Winding machine, currently used more is the cam combined energy-saving winding machine.
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