Cosmetic packaging consists of bottle caps, tanks, pumps, transparency masks and decorations, often using PP, ABS, PET, PMMA, SAN or specially designed commingled materials. The product looks high, with colours, glitters, black dots and water shrunk having a direct impact on brand perception, followed by spraying, vacuum plating, wiring or scalding. The modulation should be preceded by recognition of the compatibility of the resin and the colored mother, the requirements for exposure to food or cosmetics, the post-processing method and the proportion of the allowed retort. The transparency of the different batches and the background colour are also to be compared by standard light sources.

The front line for the movement of appearances must be stabilized. The location of the melting line and the congested gas is determined by short-shot, and the melting body is smoothed through the main exterior at a fractional speed, avoiding high-speed ejection near the watering mouth, and avoiding plume burning at the end. Modular temperatures are to be even and matched with their polishing or texture, and too low temperatures can lead to flue marks and light differentials, while too high may prolong cooling and increase viscosm. Transparent or light-coloured products, in particular, control drums, nozzles and hot-flow channels, should be clean and replaced with a sufficient number of products.

The snails, caps and seal surfaces of the bottle need to be stable in size and hand. The pressure time is determined by means of a weight platform, which is then used to control the constriction and the response of the top. Excessive pressure can overwhelm the screws, pretenses white or create stress break; and lack of cooling can alter the circle and seal surfaces after the model. Multi-cavette molds should be compared with each cavity weight, opening power and assembly twirl, and cannot be judged by total production alone. Pump-head flowways and sub-columns will also focus on the cleaning of vents and the prevention of burning and lack of glue.

Poor post-processing sometimes results from the plating phase. Residual stress may break after exposure to plating, spraying or solvents, surface demulators and volatilizers may influence investment, and excessive temperatures may cause colour drift. Post-processing tests should be included in the process validation. The screw structure ensures that the colored mother is evenly dispersed, while avoiding overcuting and dead ends. The weight, colour difference, light, twist, seal and fall performance of the product at the time of mass production allows for the satisfaction of a beautiful appearance with the reliability of the actual use.