In our purchase of PE film heat shrinking machine, we need to pay attention to some problems. One is that customers need to choose the corresponding PE film heat shrinking machine according to the shrink film. In the market, there is a special PE film heat shrinking machine, as the name suggests is used to shrink the PE film. Customers who have used this machine know that the shrinkage temperature of the PE film is about 180 degrees, so the temperature of the shrink film exiting the furnace is relatively high, and the shrink film is not completely cooled when it exits the furnace. Therefore, the PE film shrinks behind the furnace. The cooling frame is used to cool the shrunk film to ensure good shrinkage and shape after packaging. For most products, if you use PE film, you must choose PE film heat shrink machine to shrink the package, just according to the different furnace size selected by the product. However, there are two cases where the PE film can be shrunk with a POF shrinking machine.
1. One of them is the shrinkage of the pipe. For such long objects, the POF film can be chosen because the object will always go in the shrinking machine. When one end of the object comes out of the shrinking furnace, it takes a long time for the object to completely shrink. This time allows the shrinking furnace to cool naturally. It is also possible to use without a cooling device.
2, PE film is relatively thin: the amount of product required to package is not large and the PE film used is relatively thin, in this case can also use POF film shrinking machine instead of PE film shrinking machine.
We also have two cases in which the POF shrinking machine is used to shrink the PE film on the market. When purchasing a PE film heat shrinking machine, you can also choose according to your own requirements. There are occasional misunderstandings when purchasing PE film heat shrinking machines. Many times, PE film heat shrinking machines are common faults, which is also caused by this. For example, the shrinking machine seals the problem.
In actual production, each manufacturer controls the heat seal strength as one of the most important quality indicators for both the bag-making products and the coil products used in the automatic packaging production line. In the following, combined with the experience of the actual use of PE film heat shrinking machine, a simple analysis of the factors affecting the heat seal strength of the heat shrinkable film is made:
1. Heat sealing temperature: The heat sealing temperature directly affects the heat sealing strength of plastic composite packaging products.
2, heat sealing time: the heat sealing time of the automatic packaging machine or the old bag making machine is determined by the machine speed. In the case where the heat sealing temperature and the heat sealing pressure are constant, the longer the heat sealing time, the stronger the bonding between the heat sealing layers. However, if the heat sealing time is too long, wrinkles and unevenness may occur in the heat-sealed portion of the composite film, which seriously affects the appearance quality of the product.
3, heat sealing pressure: In order to ensure the heat sealing strength of plastic composite flexible packaging, a certain heat sealing pressure is essential. Therefore, the heat sealing pressure is required to be moderate and uniform during the heat sealing process. If the heat sealing pressure is insufficient or uneven, bubbles will be generated in the heat-sealed portion and the welding will be performed, resulting in poor heat sealing.