Have you ever noticed a thin line on a skincare bottle, cream jar, or cosmetic cap?

It may become more visible under certain lighting, and sometimes you can even feel a slight ridge when running your finger across the surface.

Is it a manufacturing defect? Not necessarily.

This line is commonly known as a parting line. It is a feature that may appear on molded packaging, depending on the mold design, manufacturing process, and product structure.

Understanding parting lines can help beauty brands evaluate packaging samples more accurately and make better decisions about product design and decoration.

Learn what happens after a cosmetic packaging prototype is approved, including functional testing, mold correction, T1/T2/T3 trials, TE validation, and mass production preparation.

Learn what to check before mass producing cosmetic packaging, including appearance, dimensions, wall thickness, stability, cap fit, opening experience, and prototype testing.

When you pick up a beautifully designed lipstick tube or a crystal-clear serum bottle, you may never think about what happens before filling.

But behind every high-quality cosmetic container lies a critical process:

 Bottle cleaning (container washing & sterilization)

At BEYAQI, this step is treated as a precision-level operation, ensuring every bottle is safe, clean, and ready for filling.