Basic knowledge of blown film machine
Release date：2025/6/25 1:54:00 Number of clicks：174 次 news source：
There are many types of blown film machines, such as PE, POF, PVC, etc. The new material, new color, clean, and stretchable cloth bag is produced by blowing the film with new particles.
1、 Process principle
Add dry polyethylene particles into the hopper, and the particles enter the screw according to their own weight from the hopper. When the particles come into contact with the inclined edge of the thread, the rotating inclined edge generates a thrust perpendicular to the inclined edge of the plastic, pushing the plastic particles forward. During the pushing process, due to the friction between the plastic and the screw, the plastic and the cylinder, as well as the collision and friction between particles, and also due to the external heating of the cylinder, it gradually dissolves. Molten plastic is filtered by the machine head to remove impurities from the mold mouth, cooled by a fan coil, and inflated by a zigzag plate, traction roller, and coiler to roll the finished film into a cylindrical shape.
2、 Main structure
It is mainly composed of extruder, die, mold, cooling device, foam stabilizer, herringbone plate, traction roller, coiler, etc.
The driving motor is an electromagnetic speed regulating motor (or a variable frequency ordinary motor), and the reducer adopts a belt drive to make the screw work during the rotation of the cylinder. Under external heating conditions, the melted plastic particles in the hopper are squeezed out of the mold mouth through three filters, and the mold head adopts an advanced spiral mold head structure. Based on the special characteristics of high pressure, low pressure, mixed materials, and recycled polyethylene materials, the main technical parameters such as helix angle, inclination angle, set angle length, and mold opening were designed. After multiple comparative experiments, the cooling device was optimized and determined to be composed of cooling air rings, air ducts, air ducts, fans, etc.
Traction is composed of main components such as traction frame, herringbone plate, traction roller, winding mechanism, traction motor, etc
Electrical control generally has the main body and fan controlled by separate button switches, three-way buttons, and mold buttons for electric heating. The two sets of coils in critical areas are automatically measured and controlled by thermocouples. During normal production, temperature can be automatically controlled to ensure the stability and reliability of the production process. There are many types of blown film machines, such as PE, POF, etc.
The new particles blown out with new materials have a balanced color, are clean, and have good bag elasticity.
Some people also use recycled plastic bags to make pellets, which are often referred to as old materials. When they turn into particles, they are usually gray. When they are made into bags, it is usually necessary to add pigments. When making bags, the colors are uneven, fragile and easy to break, and the price is low.
Although it is a recyclable plastic bag, it is generally a waste bag during the bag making process, which is very different from the general meaning of garbage plastic.
The blown film machine is suitable for various high-end film packaging. This film has good barrier properties, freshness, moisture resistance, antifreeze, oxygen resistance, and oil resistance, and is mainly used for light and heavy packaging. Such as various fresh fruits, meat products, pickled vegetables, fresh milk, liquid beverages, medical supplies, etc.
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