Cosmetics packaging production process and the analysis of common problems

Forming process is a process of two-way stretch, in the process, PET chains are arranged two-way stretch, orientation, and, thus increasing the cosmetics packaging production wall mechanical properties, improved tensile, tensile, impact strength, and has good air tightness. While stretching helps to improve the strength, but not excessively stretching, to control the tensile expansion ratio, radial not more than 3. Five to four. 2, the axial not more than 2. 8 ~ 3. 1. Cosmetics packaging production of billet thickness not more than 4. 5mm。 Cosmetics packaging production is between the glass transition temperature and crystallization temperature, general control between 90 ~ 120 degrees. PET show is within the range of the high elastic state, rapid molding, cooling after setting become transparent cosmetics packaging production. In step method, the temperature is determined by the cooling time length in molding process ( Such as aoki cosmetics packaging production machine) , so to join good note - The relationship between the two stations. In the process of plastic are: tensile - At a time - Second, three action time is very short, but be sure to cooperate well, especially the former two step determines the overall distribution of the material, cosmetics packaging production quality. So to adjust good: stretch the starting time, stretching rate, start and end time, gas pressure, gas flow rate, etc, if possible, it is best to control the billet temperature distribution of the overall cosmetics packaging production, cosmetics packaging production base, both inside and outside wall temperature gradient. In the process of rapid molding, cooling, cosmetics packaging production wall has induced stress. For fizzy drink cosmetics packaging production, it can be resistant to internal pressure, is good, but for hot filling cosmetics packaging production have to make sure it fully above the glass transition temperature for release. Common problems and the solution 1. On thick thin, delay the time, or reducing pre - pressure, reduce the gas flow rate. 2. Under the thick thin: contrary to the above. 3. Cosmetics packaging production there are buckling under the neck: too late or pressure is too low, or the billet cooling. 4. At the end of white: cosmetics packaging production base too cold; Too much tension; Too early or preloading is too high. 5. Cosmetics packaging production base with a magnifying glass phenomenon: cosmetics packaging production base too much; It's too late, preloading is too low. 6. Cosmetics packaging production base with buckling inside: the bottom temperature is too high, Gate in cooling bad) ； Too late pre pressure is too low, traffic is too small. 7. The cosmetics packaging production ( Opaque) : cool enough. 8. Local white: overstretch, where the temperature is too low, or too early, or touched the tensile bar. 9. Eccentric cosmetics packaging production base, the billet temperature, tensile, and cosmetics packaging production forecast, such as high pressure may have a relationship. Lower the temperature in the cosmetics packaging production base; Speed up the drawing; Check the lever of the gap between head and bottom die; Delay in advance, reduce the pressure of advance; Delay the high pressure; Check eccentric cosmetics packaging production base.