During operation, the air volume can be adjusted to control the cooling rate of the membrane tube. When blowing polyethylene film, the film tube near the machine head is transparent, but at a height of 20 centimeters above the machine head, the film tube is turbid. The internal cooling air ring is placed inside the membrane bubble and uses the principle of hot air rising to cool the inner surface. It needs to be used in conjunction with the internal cooling die. The upper air ring is fixed by three lifting support columns, and the height of the air ring can be adjusted arbitrarily within a certain range.
The deformation of the wind ring has an impact on the thickness of the film. When the wind is strong, the film will become thicker, and when the wind is low, the film will become thinner. Due to the flow of air between the inner and outer rings during the bubble forming process, the air flow inside the ring is generated by a fan, resulting in high air pressure and fast flow velocity. The outer ring is the natural airflow field of the environment, with low air pressure and slow flow velocity, resulting in the jet effect of the inner ring airflow. The natural air outside the ring is forced into the ring through the air inlet of the jet ring, thereby increasing the air flow inside the ring, improving the cooling capacity of the air ring, and achieving a certain energy-saving effect. Nowadays, blown film machines have developed high-end technology. Blown film can also be used as an application technology for food preservation, taking the path of manufacturing new blown film machines.
A special type of cling film blown out by a blown film machine, using advanced technology to make fruits and vegetables durable. In order to meet the needs of social products and environmental protection, plastic blown film machines will continuously introduce advanced technology, adjust industrial models, and promote the plastic industry to move towards the high-end. However, for the innovative development of plastic film blowing machines, it is not only an innovation in production technology, but also a reform in various aspects such as technology, indicators, and corporate culture. This reform is also a historic choice for energy conservation and emission reduction based on the requirements of sustainable development. Due to the difficulty of casting and the high strength of cast aluminum parts, large wind rings are welded with inner cast aluminum parts and shell steel plates.
Structurally, the wind circle is divided into: air inlet, ventilation body, rotating body, and upper and lower lips (air outlet). The number of air inlets is even, evenly distributed at the lower or side of the air ring, and connected to the fan's air distribution package through air ducts. The main body of air exchange is a hollow shell with a labyrinth cross-section. The built-in guide vanes play a role in uniform airflow and establishing air pressure. The internal cooling air ring is placed inside the membrane bubble and uses the principle of hot air floating to cool the inner surface. It needs to be used in conjunction with the internal cooling die. The upper air ring is fixed by three lifting support columns, and the height of the air ring can be adjusted arbitrarily within a certain range.
If the ambient temperature air in the air ring is cooled to 15-18 ℃ by forced cooling, and the cooling air at 15-18 ℃ is combined with the cooling system inside the IBC membrane bubble to continuously cool the inner wall of the membrane bubble, the membrane yield can be increased by more than 30%.