Blown film performance characteristics

The inflation film is a tubular film that is extruded from a circular die of an extruder and is blown with compressed air. The performance of the film is between the flow film and the orientation film, and the film is blown. The performance is not only related to the type of resin, the relative molecular mass size and distribution, and the degree of crystallinity, but also has a lot to do with the process parameters of the blown film production, especially the temperature, the blow-up ratio, the traction ratio, the dew point line height, etc. Its performance characteristics are:

(1) The inflation method is limited by the cooling effect, the production line speed is low, generally 30 ~ 60m/min, and pp in the blowing, only the use of blowing water cooling can have good transparency, or pp blowing Inflatable film poor transparency;

(2) Inflated film Because the film is subjected to the lateral expansion of the compressed air and the longitudinal pulling of the pulling roller, the molecules in both the horizontal and vertical directions are oriented. After the crystalline polymer is stretched and oriented, the strength is increased, and thus the film is blown. Mechanical and physical properties are greater than that of the mantle film, but due to the small degree of orientation, it is lower than the oriented film.

(3) The blown film can be heat-sealed, but the heat sealability is worse than that of the cast film;

(4) Inflatable membranes have internal stress, so there are various problems caused by internal stress, such as: heat shrinkage rate is relatively large, especially when cooking bag heat sealing inner material, the size of the bag after cooking, shrinking Larger;

(5) The inflation performance of the blown film has a large imbalance between the longitudinal and transverse properties. Due to the imbalance between the blow ratio and the draw ratio, longitudinal or transverse tears tend to occur, and the film strength is greatly reduced.

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