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Qihe New Materials and High end Equipment
Manufacturing industrial Park
Views: 0 Author: Site Editor Publish Time: 2025-11-24 Origin: Site
PET cosmetic packaging demands strict control over appearance, structural stability, and compatibility with beauty formulations. To ensure clarity, uniformity, and durability, blow molding must be executed with precision across material handling, heating, stretching, and cooling stages.
| Specification | Requirement |
|---|---|
| Resin Type | Food-grade or cosmetic-grade PET |
| Moisture Content | ≤ 0.003% after drying |
| IV Range | 0.76–0.84 dl/g (based on bottle structure) |
| Optional Additives | UV resistance, anti-static agent, alcohol resistance, color masterbatch |
Note: Many cosmetic formulas contain alcohol, essential oils, or actives — resin compatibility is critical.
No crystal points, bubbles, haze, flow lines, or black specks
Smooth but well-defined parting lines
Accurate wall thickness and gate geometry to ensure proper blowing
Preform quality directly determines transparency, molding uniformity, and cosmetic-grade aesthetics.
PET cosmetic bottles often feature thicker walls and heavier bases, requiring precise temperature zoning.
| Zone | Temperature |
|---|---|
| Main Heating Zone | 95–120°C |
| Neck Protection Zone | No heating / low holding temperature |
Objective: Stable internal–external temperature gradient to avoid whitening, stress marks, or deformation.
Axial stretch ratio: 2.8–3.6
Radial stretch ratio: 3.5–4.2
| Stage | Pressure |
|---|---|
| Pre-blow | 5–12 bar |
| Final blow | 25–35 bar |
Ensures precise forming, sharp line definition, and consistent bottle geometry.
High-grade mold steel (S136 / 2316 or chrome-plated steel)
Polishing level: Mirror finish (#12000) or plating-treated surface
Uniform cooling channels to prevent haze or crystallization
| Inspection Item | Standard |
|---|---|
| Transparency & Gloss | High clarity, no whitening or haze |
| Wall Thickness Tolerance | ±0.05–0.15 mm depending on design |
| Parting Line | Smooth, minimal visibility |
| Neck & Thread Accuracy | Full compatibility with pumps, sprayers, or closures |
Drop Resistance: 1–1.5m without cracking
Alcohol Resistance Test: 48–72 hours exposure with no stress cracking
Leakproof Test: Vacuum or compression, no leakage
ESCR（Environmental Stress Crack Resistance）: Verified with final formula
PET cosmetic bottle production requires elevated precision compared to standard beverage packaging. The process emphasizes:
High clarity, dimensional accuracy, chemical resistance, and premium appearance.
Only with precise control of raw materials, preform quality, blow molding parameters, and mold performance can manufacturers meet luxury cosmetic packaging standards.
We pursue the same price, high-quality products, so that users have a better experience after receiving them. This is our responsibility and obligation
