Under what circumstances does the PET plastic bottle blowing process have an excellent product?

Information summary

Many of the previous tweets introduced PET plastic raw materials. With good raw materials, what kind of technology and environment are needed to produce better products?

Many of the previous tweets introduced PET plastic raw materials. With good raw materials, what kind of technology and environment are needed to produce better products?

, auxiliary machine and mould

Auxiliary equipment mainly refers to equipment that maintains the constant temperature of the mold. The constant temperature of the mold plays an important role in maintaining the stability of the product. Generally, the temperature of the bottle body is high and the temperature of the bottle bottom is low. For the cold bottle, because the cooling effect at the bottom determines the degree of molecular orientation, it is better to control the temperature at °C; while the temperature at the bottom of the hot bottle is much higher.

The mold is an important factor affecting the PET bottle blow molding process. The shape of the mold will reduce or increase the difficulty of process adjustment. For example, the ribs, the curvature of the transition zone and the heat dissipation at the bottom will all affect the process adjustment. .

、Environment

The quality of the production environment also has a greater impact on the process adjustment. Constant temperature conditions can maintain the stability of the process and the product. Blow molding of PET bottles is generally best at room temperature and low humidity.

, other requirements Pressurized bottles should meet the requirements of stress test and pressure test at the same time. The stress test is the internal quality control to prevent the degradation of the molecular chain during the contact between the bottom of the bottle and the lubricant (alkaline) when the PET bottle is filled with cosmetics, resulting in cracking and leakage; the pressure test is to prevent the bottle from being filled Quality control for bursting after entering a certain pressure of gas. To meet these two needs, the thickness of the center point must be controlled within a certain range. Generally, the center point is thin, the stress test is better, and the pressure resistance is poor; the center point is thick, the pressure test is better, and the stress test is poor. Of course, the results of the stress test have a lot to do with the accumulation of materials in the transition zone around the center point, which should be adjusted based on actual experience.

, conclusion

The adjustment of the PET bottle blow molding process is carried out for the corresponding material. If the material is not good, the process requirements are very strict, and it is even difficult to blow out qualified bottles.

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