How to use a heat shrink machine? What are the common faults? What can be packaged?

The application probability of the fully automatic shrinking machine is ideal, and its application effect is also satisfactory to customer feedback. However, relatively speaking, the safety operation of the equipment also requires the user's attention. Below, the editor of Xianji.com will share with you the usage tips, common troubleshooting, and application cases of heat shrink packaging machinery.

Tips for using heat shrink packaging machinery: Selection of conveyor belt

Mesh conveyor belt

The stainless steel mesh belt conveyor structure is mainly designed for heat shrink packaging of small products. One of the universal structural configurations of heat shrink packaging machines. For paper boxes, stationery, daily necessities, small accessories, lighting fixtures, etc., they can all be packaged with very good results. Products with irregular shapes and arbitrary placement generally do not affect the shrink packaging effect. This structure is generally not suitable for products that are too heavy; Stainless steel mesh has fast thermal conductivity and is prone to leaving some mesh patterns on the contact surface. Therefore, for high-quality products and handicrafts that require high performance, it is recommended to use high-temperature resistant PTFE mesh belt structure.

Chain conveyor belt

Chain conveyor belt structure is mainly used for heat shrink packaging of heavy and large items. For some cylindrical items, using the distance between two rolling needles to support them can allow the product to roll as the needles run, and the shrink film is heated more evenly, resulting in a particularly good shrinkage effect; The contracted product placed flat on top can also be pushed forward with the rolling operation of the rolling needle, reducing the phenomenon of leaving marks on the contact surface of the rolling needle. The overall shrinkage effect achieves flatness and smoothness. (Note: For general heat shrink packaging machines, it is difficult to achieve the effect of needle rolling and translation for products that are too heavy.).

Teflon mesh conveyor belt

The high-temperature resistant PTFE mesh belt conveyor structure is mainly designed for shrink packaging of products that require high shrinkage effect and do not allow contact surfaces to leave patterns or marks. It can be suitable for very small products without burning the film

Tip 2 for using heat shrink packaging machinery: temperature control

The influence of temperature on the thermal shrinkage effect

If there are wrinkles after shrinkage, it is possible that the temperature is too low. You can adjust the temperature by using a temperature controller to increase the temperature and check whether the wrinkles are severe. Generally, you can set the temperature to+5 ℃ to+10 ℃, and then wait for 2-3 minutes to try again. If the temperature is still not high enough, continue to try increasing and shrinking. If there is excessive shrinkage such as rupture after contraction, that is, if the temperature is too high, depending on the severity of the rupture, lower the temperature in the temperature control meter and try again every 2-3 minutes.

Tips for using heat shrink packaging machinery three: speed control

The conveying speed of the shrinking machine

When the furnace temperature is slightly low, rotate the motor speed adjustment knob counterclockwise to slow down the transmission speed, which is equivalent to appropriately prolonging the heating time of the shrink film in the furnace, preventing wrinkles caused by incomplete shrinkage due to too short a heating shrinkage time of the shrink film; The speed adjustment knob can also be used to quickly pass the product through the furnace when the furnace temperature is too high, shorten the time for the shrink film to stay in the furnace, and prevent the shrink film from cracking due to excessive shrinkage. Achieve satisfactory shrink wrap effect. (When using PE shrink wrap for packaging, the judgment of the effect also needs to consider the air volume and blowing angle of the cooling fan unit at the end of the machine.)

The air volume and speed of the fan

The fan of the shrink machine has the function of balancing the temperature of the hot air inside the furnace, and when turned on, it forms a rotating airflow (hot air), which tightens the shrink film on the surface of the packaged product. Excessive or insufficient wind speed can cause excessive contraction or relaxation of the shrink film, resulting in wrinkles. Therefore, when debugging the shrinkage effect, we should also consider the factor of fan speed when considering the furnace temperature and conveying speed. It is necessary to select whether the fan power meets the standard, and whether the fan blade diameter and installation position are appropriate. If the product is relatively small and light, you can slow down the wind speed appropriately, install smaller blades, or even replace the fan with a smaller power. For large individual products or metal products with fast thermal conductivity, it is appropriate to use fans and blades with higher wind speed and volume.

Common troubleshooting of heat shrink packaging machine

1. The conveyor network is not rotating: the conveyor switch is malfunctioning, please replace it; The speed control board is damaged, please replace it; The potentiometer is broken, replace it; The conveyor motor is damaged and needs to be replaced; The conveying mechanism is stuck, check and eliminate the fault;

2. The hot air motor of the heat shrink machine does not rotate: the hot air switch is damaged, replace it; Motor damage, replace;

3. The reason why the heat shrink packaging machine is prone to material accumulation in the center column is due to poor shrinkage packaging, the size of the heat shrink packaging machine does not match the design size of the center column, and the labeling machine is not adjusted properly. Choose a labeling machine that is stable, easy to adjust, and has a high tolerance for errors in the size of the heat shrink packaging machine. The quality of the shrinking machine is controlled by the factory;

4. The labeling of the heat shrink packaging machine is not accurate and cannot be carried out at the designated position. The reason is that the labeling machine has not been adjusted properly or there is static electricity in the heat shrink packaging machine. The solution is to choose a labeling machine with high stability, easy adjustment, and low static interference to the shrinking machine. Strengthen the technical training of operators and use static elimination equipment.

Application case of heat shrink packaging machine

We usually eat bagged black sesame paste, but now there is a more convenient cup packaged black sesame paste. Like cup milk tea, the packaging of cup black sesame paste requires the use of a shrink wrap machine.

Feeding, bagging, sealing, and shrinking are automatically completed. The black sesame paste for cup packaging is a layer of film on the bread of the cup, tightly attached to the cup body, which looks quite exquisite. Many companies also print batch numbers on the envelope. Using a shrink wrap machine to wrap, it can pack 40 pieces per minute.

The packing, sealing, and packaging of shrink wrap machines can also be completed using automated packaging equipment. When used in conjunction with packaging assembly lines, work efficiency is higher, truly unleashing productivity and making work easier.

The above is an introduction to the usage skills, common troubleshooting, and application cases of heat shrink packaging machinery. To achieve better shrinkage effects, please remember five key points: adjusting temperature, adjusting speed, wind speed, shrink film quality, and furnace length. In addition, punching holes in the shrink film is mainly aimed at the situation where the shrink film is fully wrapped. When the user's product needs to be fully wrapped, some small holes must be punched on the surface of the shrink film, so that the gas inside the film can be released through the small holes during shrinkage. Otherwise, the gas will be trapped inside the film, and the film will bulge.