Why does the bottle blowing machine have bottle mouth deformation? Pay attention to these reasons!

　　Why does the bottle blowing machine have bottle mouth deformation?

In bottle blowing production, although the bottle mouth is only a part of the product, it directly affects the appearance, capping, sealing, and usage effect.

In actual production, some bottles may appear normal just after being removed from the machine, but upon careful inspection, it can be found that the bottle mouth is not round, skewed, has dimensional deviations, uneven wall thickness, and even partially collapsed.

So, why does the bottle mouth deform? Usually related to the following aspects.

　　PART01

　　Inappropriate temperature control

Bottle mouth molding is sensitive to temperature. When the temperature of the billet is too high, the viscosity of the melt decreases, the rigidity and melt strength may be insufficient, and the bottle mouth is more likely to deform during the forming and cooling process; If the temperature is too low, it may affect the flow and forming effect of the billet. Therefore, it is necessary to control the temperature reasonably according to the material, product structure, and production process.

　　PART02

　　Unstable positioning of the pen insertion

Inserting the pen requires accurate coordination with actions such as closing the mold and blowing air. If there is a deviation in the positioning of the pen, or if the accuracy of repeated positioning is insufficient, it may affect the concentricity and molding stability of the bottle mouth, and in severe cases, problems such as bottle mouth eccentricity and skewness may occur.

　　PART03

　　moldThere is a deviation in alignment with the molded parts

A reasonable alignment relationship needs to be maintained between the billet, mold, and plug. If there is a deviation between the center of the mold, the position of the billet, and the center of the insertion pen, it may cause the bottle mouth to be offset or skewed, and may also lead to abnormal distribution of local wall thickness.

　　PART04

　　Uneven cooling of bottle mouth

After the bottle mouth is formed, it needs to be cooled thoroughly and evenly. If the cooling is insufficient or uneven locally, and the bottle mouth is not fully shaped before demolding, deformation may occur due to thermal shrinkage and internal stress release in the future.

　　PART05

　　Product structure and material factors

After discovering the problem, you can first determine the direction based on the deformation performance,Recheck the temperature, pen positioning, mold alignment, and cooling status,Finally, a comprehensive analysis is conducted based on the equipment operation, product structure, and material status.

Therefore, stable bottle mouth molding requires not only reasonable process parameters,Stable equipment operation, precise action coordination, and reliable control accuracy are also required.