Manufacturing Process and Technical Principles of "Vacuum Bottle" Packaging Materials
Time: Jan 08,2026
The vacuum flask is a multi-component system, with different materials used in various parts:
| Component | Common Materials | Properties & Functions |
| Bottle Body | AS (Acrylonitrile-Styrene) | High transparency, good hardness, good chemical resistance (prevent content permeation) |
| Bottle Body | ABS (Acrylonitrile-Butadiene-Styrene) | Stronger toughness, impact resistance, but lower transparency than AS |
| Bottle Body | PP (Polypropylene) | Semi-transparent to opaque, excellent chemical resistance, low cost, mostly used in mid-range products |
| Bottle Body | Glass (Coated) | Ultra-high texture + barrier property, inner wall needs to be coated with SiO₂ and other barrier layers to prevent permeation, high cost |
| Piston/Liner | HDPE (High-Density Polyethylene) | Good flexibility, extrusion resistance, forming a sealed airtight layer |
| Piston/Liner | PP (Polypropylene) | Higher rigidity, used in structures requiring stronger support |
| Pump Head System | PP (Shell, Spring) | Fatigue resistance, high chemical stability |
| Pump Head System | POM (Polyoxymethylene, Valve Stem) | High hardness, low friction coefficient, ensuring smooth valve operation |
| Pump Head System | Silicone/EPDM (Sealing Ring) | Long-lasting elasticity, aging resistance, ensuring airtightness |
| Straw | LDPE (Low-Density Polyethylene) | Flexible and easy to bend, with a counterweight ball (PP/Stainless Steel) at the bottom to ensure thorough material suction |
| Outer Cap | ABS/PP | Decorative and protective, can be electroplated or spray-coated to enhance texture |
Classification of Airless bottles：
Airless bottles are classified according to their structural principles and appearance:
1. According to the working principle
| Type | Principle | Advantages | Limitations |
| Piston Type (Mainstream) | Press the bottom piston to move up → negative pressure forms in the bottle → contents rise | Reliable structure, good sealing, residual rate < 5% | High precision requirements for the piston |
| Bag-in-Bottle Type | Flexible inner bag contracts → contents are squeezed out; outer bottle remains undeformed | Fully isolates air, ultra-high freshness preservation | Extremely high cost, low production capacity |
2. Classified by the material of the bottle shape
——All-plastic vacuum bottle (AS/ABS + PP inner liner, accounting for 80% of the market)
——Glass vacuum bottle (glass body + plastic inner liner, exclusive for high-end lines)
——Metal vacuum bottle (stainless steel outer shell, niche high-end product)
3. Classified by pump head type
| Type | Features | Applicable Products |
| Round Head | Basic press type, dosage 0.1ml-0.5ml | Essence, eye products |
| Flat Head | Wide-mouth dispensing, dosage 0.3ml-1.5ml | Face cream, sunscreen |
| Spray | Atomized spray, particle size 50-100μm | Spray essence, setting spray |
| Tube-Free Pump | Directly contacts the product body, suitable for high-viscosity products | Foundation, concealer |
Detailed Explanation of Technical Principles
1.Vacuum formation mechanism:
- First press: Push the piston upwards → Air in the bottle is expelled through the exhaust valve → A negative pressure area is formed
Release pressurization: Spring returns to original position → Negative pressure is generated at the lower end of the tube → The contents are drawn into the pump chamber
- Press again: The paste in the pump chamber is pushed out, and the piston moves upward simultaneously to fill the space → Air 0 comes into contact
2. "Zero Residue" Secret:
The gap between the piston and the bottle body is ≤ 0.05mm, ensuring that the paste cannot flow back.
The gravity ball at the bottom of the straw moves down along with the liquid level and always comes into contact with the paste.
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