Shrink packaging and transport packaging (below)

This method is to use a single roll of flat film, the first longitudinal seam to form a tube, the equipment wrapped in it, and then sealed transverse joints and cut into a pillow-type packaging. 
After the four-side sealing method is pre-sealed, the internal residual air expands during heat shrinkage, making the film shrink difficult and affecting the quality of packaging. Therefore, the puncture needle is often installed near the sealing device, and the puncture needle punctures the bleed hole on the film during heat sealing. After the heat shrinkage, the pores at the sealing seam can often be closed by themselves. 
3 Open at one end: use a film to make a big bag on the bottom, and then put the bag on the tray of the stacking equipment from top to bottom, and then bring the tray to heat shrink. 
Pallet shrink packaging is a fast growing method in transport packaging. The main features are: Products can be packed in a certain number of units firmly, not loose in the transport, can be stacked in the open air. 
2. Heat shrinking operation. The equipment used for heat shrinking is called a heat shrink tunnel (also called heat shrink tunnel) and consists of a conveyor belt and a heating chamber. The heat shrinking process is: placing the prepackage on the conveyor belt, the conveyor belt running at the specified speed, sending it to the heating chamber, blowing hot air to the package for heating; leaving the heating chamber after the heat shrinking, cooling naturally, from the conveyor belt Remove it.
When the volume is large and the heat-shrinkage temperature is high, the cooling fan is often accelerated after leaving the heating chamber. 
After comparing the above methods, our selected process is:
With a thick 0.25mm PE film or PVC plate (sheet) plastic containers - → loading - → into the heat shrink machine heating - → shrinkage - → sealing - → cooling - → inspection - → labeling. 
Fourth, machine selection
There are many kinds of shrink packaging machines at home and abroad. Small shrink packaging machines are mainly used to pack small parts and components, and are mostly used for pillow-shaped bag packaging. L-type sealing packaging machines and plate heat sealing packaging machines are suitable for various sizes of packaging; Shrink packaging machines are mainly used for corrugated cartons and large bags of product packaging. After repeated investigation and research and repeated trials, we chose the RS600/400 dual-use heat shrink packaging machine.
The machine is used for the sealed packaging of large parts and packages. It is suitable for shrink packaging of polyethylene (PE) and polyvinyl chloride (PVC) materials. The machine is composed of furnace body, cold box, heat and power supply. With the characteristics of long tunnel, sufficient heat, large power and fast cooling, it is an ideal packaging equipment for shrinking various large and heavy equipment.
The machine uses a quartz tube attack as a source of heat. Adjust the pressure from top to bottom, constant temperature from room temperature to 250°C, suitable for shrinkage of films with different thicknesses. Transmission using electromagnetic frequency variable speed motor, great power, smooth operation. The upper box adopts a flip type, and the lower box bottom plate can be pulled out to one side for maintenance and cleaning. A vortex fan is installed in the drying tunnel to ensure uniform heat in the drying tunnel. The outlet cooling box is designed with the characteristics of thin film that is hot and cold, ensuring the quality of the packaging. Now, the machine is mainly used for packing ordnance maintenance equipment of polyethylene (PE) material with a thickness of 0.12mm, 0.18mm and a width of 1000mm.