Qian Feng Plastic Products Factory specializes in processing and production of plastic products, vest bags, bags on roll, and so are more popular, and in the process of making plastic bags, there is a process called blown film, this process there are several points to note, Together we look at. First, when the extruder temperature blow LDPE extrusion temperature control between 160 ℃ -170 ℃, must ensure that the head temperature uniformity. Extrusion temperature: resin is easily decomposed and brittle film, in particular of the longitudinal tensile strength decreased significantly. Extrusion temperature is too low: resin plastics bad, the tensile strength of the film is low, and the surface gloss and transparency is poor, even as the timber ring-like pattern as well as the melting of the two nuclei, vest bag blowing swelling than blow-up ratio is the comparison of the blown film process links it with the base amount, compared with the traction control the width and thickness of the film. At the same time blow-up ratio of the size, but also affect the thickness of the film is uniform transverse tensile strength and the film. Blow-up ratio can be improved to increase the lateral strength of the film, but not too much, or likely to cause bubble unstable and prone to wrinkles the film, while the film will be the situation of uneven thickness. Generally, LDPE film blow up ratio is preferably controlled at 2.5-3.0 Third, draw ratio draw ratio is the ratio of the film take-up speed and the extrusion rate between the pipe ring. Draw ratio increases, the longitudinal strength will increase, and the thickness of the thin film, but if too large draw ratio, the film thickness is difficult to control and may even cause the film to pull off, resulting in the phenomenon of the film segment, traction LDPE Films than the general control between 4-6 is appropriate. This is regarded as professional knowledge, can be considered as an understanding, I believe this is good for you, welcome to the need to contact us, look forward to cooperation: http: //www.qianfengsuliao.com/