Under what circumstances is it recommended to use single/double screw and single/double die heads for blow molding machines

As a film blowing machine, due to the inherent characteristics of its product technology, plastic film blowing machinery basically operates non-stop 24 hours a day. Full load operation of the film blowing equipment causes significant damage to the body. If the film blowing machine is not maintained and serviced in a timely manner, it will have an impact on the service life of the machine, the accuracy and quality of film products.

The engineering of blowing film includes heating, traction, and winding processes, and heating is divided into 5 zones. 2、 The third zone is the heating zone (preheating), and the temperature gradually increases. It is very important to control the temperature. If it is too low, it is not easy to discharge, and if the temperature is too high, it is easy to modify and transform. Taking the 80 film blowing machine as an example, the first zone is about 170 ℃ lower, and the latter two zones are higher.

The fourth zone (three-way zone) also serves as the heating zone, mainly equipped with a filter screen that can filter and prevent impurities from entering the fifth zone. The transparency and smoothness of blown PE films are determined by the filter screen. The filter screen has a large mesh size (small mesh space) and filters more finely, resulting in smoother films. However, if the mesh size is too small, it can also cause the retention of raw materials.

Under what circumstances is it recommended to use single/double screw and single/double die heads for blow molding machines?

(1) If both industrial bags and market bags need to be made, we recommend a single die head and single screw for easy replacement of high and low pressure die heads.

(2) Twin screws are used to make larger plastic bags. A single screw cannot meet the extrusion volume. Customers have high requirements for the tensile strength of bags, such as express film, food packaging film, and medical packaging film, all of which require double screw and multi screw co extrusion.

(3) If the order volume of professional vest bags is large and stable, we can recommend the double screw ABA double mold head (advantages: high output, good tensile strength, good blown film brightness)

In order to obtain plastic bag products with controllable quality during the processing of Dalian plastic blow molding machine, it is necessary to control each processing link in place. In general, the processing of a film blowing machine is divided into feeding heating, traction, and control of compressed air edge collection. After blowing air through the air hole on the film head, the air is added to the middle of the circular film, and the film forms a straight line upwards. The size of the plastic bag is controlled by the amount of air blown, and then it is stabilized by a film stabilizer. The thickness is controlled by the host and traction speed, which can be understood. The faster the host speed, the faster the feeding speed, and the thicker the film. On the other hand, traction is the opposite. The faster the pulling, the thinner the film, which is the main link. Choose Debang Machinery for purchasing a film blowing machine, with affordable prices and reliable quality.