The most important factor in the operation of the film blowing machine is three factors
A temperature (machine temperature, room temperature)
Three cooling systems:Blown film production is a film suitable for a variety of high-grade film packaging. This kind of film is widely used in light and heavy packaging because of its good barrier property, fresh-keeping, moisture-proof, frost-proof, oxygen-proof and oil-resistant. Such as all kinds of fresh fruit, meat food, pickles, fresh milk, liquid beverages, medical supplies and so on.
Plastic machinery medium calenders are usually used for pilot devices such as material handling, sieve analysis, metering, kneading, and plastication, follow-up devices such as lead-off, drawing, embossing, cooling, thickness measurement, take-up, cut-off, and transmission, monitoring, and heating. Equipment, etc. constitute a complete calendering line.
Production of soft and hard films, sheets, artificial leather, wallpapers, and floor coverings.
There are many types of calenders in plastic machinery, and the number of press rolls can be divided into two, three, four, and five rolls. Press roller arrangement can be divided into F, Z, S and L and other types.
Different from other plastic machinery, the calender is composed of a frame, a press roller and its adjusting device, a transmission system, and a heating system and the like (Fig. 10 Plastic calender). The frame is usually made of cast iron and mounted directly on both sides of a cast iron or cast steel frame to support the roller bearing, cross-axis or pre-bending mechanism of the press roll, press roll adjustment device, lubrication device and other auxiliary devices. The pressure roller is made of chilled cast iron, cast steel, and its length-diameter ratio is selected according to the bending strength of the pressure roller material, and is about 2.6 to 3.5. In order to compensate for the defects caused by the uneven thickness of the product caused by the bending deformation caused by the force of the pressure roller, the pressure roller is made into a waist drum shape, and the roll crossover device and the roller pre-bending device can also be used to eliminate the uneven thickness of the product. Each roller uses a separate motor drive. Pressure roller heating generally uses steam or hot water, and the temperature difference between the two ends does not exceed 1°C. Each press roll has a separate automatic heating system. Modern calenders use roller bearings instead of traditional plain bearings to save energy, improve bearing life and accuracy of product thickness.