Use and adjustment of shrink machine

Shrinking machine has a very important position in the field of packaging. Shrinking machine is widely used, suitable for: printing, hardware, home, electronics, food, pharmaceutical and other industries. The shrinking materials used in general shrink machines include PVC, POF, PE, and the like. At present, the POF shrink film is the most widely used, and its good advantage of good transparency, high shrinkage, high tenacity, and especially environmental protection is recognized and used by a large number of manufacturers. It can also be called an environmentally friendly shrink film. So there are many areas of use. The chemical name of the PVC shrink film is: Polyethylene belongs to toxic materials. It is not environmentally friendly. It is less precarious and is gradually replaced by POF. Generally applicable to chemical non-environmental protection industry. PE shrink film is generally the most widely used in the beverage industry, characteristics: poor transparency, good will, strong pull for the product compared to heavy shrink film packaging. Suitable for large-volume automatic shrink packaging items such as cans, glass bottles, beer, and mineral water.
There are many kinds of shrinking machines. I introduce here several common materials: PE shrink and POF, PVC shrink machine. The models are similar and the principle is the same. Manufacturers need to choose the right type of shrink machine according to the customer's packaging requirements and product characteristics. The shrinking machine is simply divided into three main mechanisms 1, a heat generating mechanism 2, a blowing mechanism 3, and a conveying mechanism. These parts have interrelated factors. The following describes the use and adjustment of the three major mechanisms:
Shrink machine temperature adjustment:
PE shrinking machine power is generally about 20-40KW, the set temperature is relatively high, generally around 180 ° -220 °, according to the thickness of the material, the speed of the conveying product, the size of the wind volume, the temperature setting is also different The product can not use high temperature, low temperature, thin shrink film. If the shrink film is thick, the temperature needs to be increased, and the power of the shrinking machine also needs to be larger. The speed of transportation of the product is accelerated and the temperature is increased correspondingly. On the contrary, the temperature is reduced, and the temperature of the wind is increased accordingly, and the temperature is increased accordingly. POF, PVC shrink machine power is generally in the 5-20KW, the temperature is generally set at about 140-160 degree adjustment and PE shrink machine is basically the same Conveyor speed adjustment:
Most manufacturers will use frequency converters and electronic governors to control speed. If the product is long, the speed must be slower. The length of the shrinking machine is longer. Generally it is adjusted to 20m/min-60m/min. If the product has a very high shrinkage effect, it is recommended to use a longer shrinking machine and use low temperature and slow delivery to meet the shrinkage. effect. Select a model with a relatively large power. The temperature setting high conveying speed needs to be accelerated, and vice versa. The transport speed of the small amount of wind is slowed down and vice versa.
Wind flow adjustment:
The air volume is generally controlled by frequency conversion to control the speed of the motor. However, many shrinking machines do not have this function, and the strong function also has the adjustment of the wind direction, which effectively blows the hot air to the position where the product needs to shrink. The amount of air volume also has a great influence on the shrinkage effect. The air volume is too large. Can easily lead to shrinkage after the impact of shrinkage effect. If the air volume is too small, the scales will appear when the film does not shrink. The amount of wind is also related to the size and angle of the wind wheel. The higher the temperature is, the smaller the air volume is, and vice versa. The faster the air volume is, the smaller the air volume is.
Therefore, the heat-generating mechanism of the shrinking machine, the air blowing mechanism, and the conveying mechanism are all adjusted to each other, and changing one parameter will affect other parameter settings. The specific details also need to be based on product characteristics, shrinking material types and thickness, and requirements for production capacity. Fine adjustment of the parameters, in order to achieve a smooth and beautiful shrinkage surface, no collapse after shrinkage, folds, and so on.