By Shrink wrapper | 16 April 2022 | 0 Comments
How to make the best shrink package by adjusting the shrinking time and temperature?
The influence of temperature on the effect of heat shrinkage:
If there are wrinkles appeared on the package after shrinking, the shrinking temperature may be too low. You can adjust the temperature through the temperature controller to increase it. In order to see if the wrinkles are serious or not, set it to +5°C to +10°C, and then wait 2-3 minutes to try again. If the temperature is still not enough, then you should continue to try to increase the shrinking temperature.
If there is crack occured after shrinking, that is because the temperature might too high, you ought to reduce the temperature through temperature controller according to the serious situation of the break, and try again every 2-3 minutes. Please note that it should be small changes each time for both increase and decrease the setting temperature.
Conveying speed of shrink wrapping machine:
In terms of the furnace temperature is slightly low, we can turn the motor speed adjustment knob of the conveyor counterclockwise to slow down the transmission speed, which is equivalent to appropriately lengthening the heating time of the shrink film in the furnace, to prevent the contractable film from insufficient shrinking due to too short heat shrinkage and causing incomplete shrinkage wrinkles;
In the contrary, the speed adjustment knob of the conveyor can also be used for making the product fast to pass through the furnace when the furnace temperature is too high, shorten the time of the contractable film in the furnace, and prevent the contractable film from cracking due to excessive shrinkage. Achieve a more satisfactory shrink packaging effect. (If you use PE shrink film packaging, for the judgment of the effect, you also need to consider the air volume and blowing angle of the cooling fan group which located at the end of the machine)
The air volume and speed of the fan:
The fan of the heat shrink wrapping machine has the function of balancing the temperature of the hot air in the shrink furnace, and forms a rotating air flow (hot air) after the machine running, this will make the shrink film on the surface of the packaged product can achieve the effect of tightening. In terms of the wind speed is too high or too small, excessive shrinkage of the contractable film or loose wrinkles will occur on the final package. Therefore, for the adjustment of the shrinkage effect, when it comes to the furnace temperature and conveying speed, we should also consider the wind speed of the fan. It is necessary to select fans with power meet the required standard, or the diameter of the fan blade and the installation position are appropriate.
When the product is relatively small and light, you can appropriately slow down the wind speed, and install the smaller fan blades or even replace a fan with a lower power capacity. For large individual products, or metal products with fast heat conduction, it is appropriate to use fans and blades with higher wind speed and air volume.
If there are wrinkles appeared on the package after shrinking, the shrinking temperature may be too low. You can adjust the temperature through the temperature controller to increase it. In order to see if the wrinkles are serious or not, set it to +5°C to +10°C, and then wait 2-3 minutes to try again. If the temperature is still not enough, then you should continue to try to increase the shrinking temperature.
If there is crack occured after shrinking, that is because the temperature might too high, you ought to reduce the temperature through temperature controller according to the serious situation of the break, and try again every 2-3 minutes. Please note that it should be small changes each time for both increase and decrease the setting temperature.
Conveying speed of shrink wrapping machine:
In terms of the furnace temperature is slightly low, we can turn the motor speed adjustment knob of the conveyor counterclockwise to slow down the transmission speed, which is equivalent to appropriately lengthening the heating time of the shrink film in the furnace, to prevent the contractable film from insufficient shrinking due to too short heat shrinkage and causing incomplete shrinkage wrinkles;
In the contrary, the speed adjustment knob of the conveyor can also be used for making the product fast to pass through the furnace when the furnace temperature is too high, shorten the time of the contractable film in the furnace, and prevent the contractable film from cracking due to excessive shrinkage. Achieve a more satisfactory shrink packaging effect. (If you use PE shrink film packaging, for the judgment of the effect, you also need to consider the air volume and blowing angle of the cooling fan group which located at the end of the machine)
The air volume and speed of the fan:
The fan of the heat shrink wrapping machine has the function of balancing the temperature of the hot air in the shrink furnace, and forms a rotating air flow (hot air) after the machine running, this will make the shrink film on the surface of the packaged product can achieve the effect of tightening. In terms of the wind speed is too high or too small, excessive shrinkage of the contractable film or loose wrinkles will occur on the final package. Therefore, for the adjustment of the shrinkage effect, when it comes to the furnace temperature and conveying speed, we should also consider the wind speed of the fan. It is necessary to select fans with power meet the required standard, or the diameter of the fan blade and the installation position are appropriate.
When the product is relatively small and light, you can appropriately slow down the wind speed, and install the smaller fan blades or even replace a fan with a lower power capacity. For large individual products, or metal products with fast heat conduction, it is appropriate to use fans and blades with higher wind speed and air volume.
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