The production of the strapping is firstly the temperature control of the extruder, generally between 250 ° C and 280 ° C. The next step is cooling. After the material is taken out of the machine head, the temperature is very high. It should be immediately cooled into the water, because the isotactic polypropylene is easy to form a twin structure in the case of rapid cooling, and the twin crystal structure is loose. Easy to stretch orientation for high quality products. It is then stretched and the purpose of stretching is to increase the longitudinal strength of the strap and reduce the elongation. Stretching must be carried out in boiling water, usually in one stretch. Finally, the embossing, the stretched packing belt passes through two patterned pressure rollers, and is pressed on the pattern. The function is to increase friction during use, not to slip, and look beautiful from the outside. The quality of the packing belt is good or bad. It depends on the high purity of the polypropylene in the packing belt. At present, there are many kinds of packing belts on the market: pure polypropylene, polypropylene packing belt and masterbatch, polypropylene plus recycled material, polypropylene plus Recycled materials and masterbatch. The packing belt made of pure polypropylene is fully transparent, the packaging of polypropylene and masterbatch is translucent, the packing belt produced by polypropylene plus recycled material is basically opaque, and the packing belt of polypropylene plus masterbatch and recycled material is produced. Completely opaque. There is also a packing belt produced by fully reclaimed material and calcium carbonate powder sandwich material. The packaging belt produced by the completely recycled material is relatively soft, and the belt of the sandwich material only has the surface as the raw material, and the rest are calcium carbonate powder (lime powder). The quality of the strap is completely dependent on the purity of the polypropylene. The higher the purity of the polypropylene, the better the tension of the strap. More packing information, please pay attention to China packing belt trading network WUJIANG HUATIAN TEXTILE TRADING CO.,LTD , https://www.huatiantextile.com