How do cosmetic packaging companies produce plastic packaging bottles?

Information summary

Plastic packaging bottles for cosmetic packaging materials are blown out by blow molding machines and hollow blow molding machines. The blow molding process is a two-way stretch process. In this process, the PET chains are extended, oriented and arranged in two directions, thereby increasing the mechanical properties of the bottle wall...

Plastic packaging bottles for cosmetic packaging materials are blown out by blow molding machines and hollow blow molding machines. The blow molding process is a two-way stretching process. In this process, the PET chains are extended, oriented, and arranged in two directions, thereby increasing the mechanical properties of the bottle wall, improving the tensile, tensile, and impact strength. Good air tightness. Although stretching helps to increase the strength, it should not be overstretched. It is necessary to control the stretch-inflation ratio not to exceed .~. in the radial direction, and not to exceed .~. in the axial direction. The wall thickness of the preform should not exceed .mm.

Blowing is carried out between the glass transition temperature and the crystallization temperature, generally controlled between ~ degrees. In this interval, the PET exhibits a highly elastic state and becomes a transparent bottle after rapid blow molding and cooling and setting. In the one-step method, this temperature is determined by the length of the cooling time during the injection molding process (such as the Aoki bottle blowing machine), so it is necessary to connect the injection-blowing two stations.

During the blow molding process, there is stretching—one blow—second blow. The three actions take a very short time, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the blown bottle. . Therefore, it is necessary to adjust the stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc. If possible, it is best to control the overall temperature distribution of the preform. The temperature gradient of the inner and outer walls.

In the process of rapid blow molding and cooling, induced stress is generated in the bottle wall. For inflatable cosmetic bottles, it can resist internal pressure, which is good, but for hot-filled bottles, it is necessary to ensure that it is fully released above the glass transition temperature.

Mainly engaged in plastic plastic cans and paper packaging products. After nearly five years of construction and development, we already have process equipment for the entire process of plastic plastic cans, PET plastic bottles, and paper packaging, and have an annual output of 8,000 plastic products. Comprehensive production capacity of more than 10,000 pieces.