What are the cooling methods for the production of Dalian plastic blow molding machines

The size of the plastic bag is controlled by the amount of air blown, and then 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. To achieve good transverse and longitudinal tensile strength of the blown membrane, it is necessary to achieve a certain ratio of blowing expansion ratio (BUR) and traction ratio (DDR). If the proportion is imbalanced, it will lead to a decrease in transverse tension. If the membrane bubble of the fully biodegradable bag is stable under the existing mold head and bending diameter, then the BUR is not a problem. If the membrane bubble is unstable, then the BUR is too large; DDR=die gap/(film thickness) × To reduce DDR, it is necessary to reduce the gap between the mold opening. Reducing BUR will only make DDR larger. This may be due to unstable film oscillation during blowing, indicating that the film head is too small. A fixed bracket can be used to stabilize the film.

Blow out ratio is one of the key control points in the production process of blow molded films, which refers to the ratio of the diameter of the blown film bubble to the diameter of the pipe ring that has not been blown out. The blowing ratio of a film blowing machine is the lateral expansion ratio of the film, which is actually a transverse stretching of the film. Stretching will have a certain degree of orientation effect on plastic molecules, and the blowing ratio will increase, thereby improving the lateral strength of the film.

What are the cooling methods for the production of Dalian plastic blow molding machines

The products produced by the film blowing machine can be air-cooled or water-cooled.

Half of the air cooling method is blowing upwards, while the water cooling method is generally blowing downwards. The cooling water temperature of the fully automatic continuous rolling bag making machine is only room temperature. Unless the temperature in your area is very special and requires special control of the water temperature, it is better to have the water temperature between 5 and 30 degrees.

Due to the mechanical force acting on the continuous rolling bag making machine when blow molded polyethylene film is used for printing or composite processing, it is required that the physical and mechanical properties of polyethylene film should be excellent, mainly including tensile strength, elongation at break, tear strength, and other indicators that meet the standards.

The mold head of the film blowing machine can heat and melt plastic particles during operation, and then make them into thin films. Due to the wide variety of plastics and the wide range of plastic film applications, there are also many different types of second-hand film blowing machines. For relevant practitioners, It is very necessary to select the appropriate type of machine according to one's own application needs. In addition to selecting the appropriate machine according to occupational needs, operators should also regularly carry out equipment maintenance work to ensure better machine performance. Before starting the blowing film machine head, operators need to inspect the lubrication of the circuit, power supply, and transmission components.