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EVA Packaging Liner - Quality Ethylene Vinyl Acetate from China Suppliers & Factory for Industrial Use
Definition
EVA (Ethylene Vinyl Acetate Copolymer) is a copolymer of ethylene and vinyl acetate. Its Chinese chemical name is ethylene-vinyl acetate copolymer (or ethylene-acetic acid vinyl ester copolymer). Typically, the vinyl acetate (VA) content ranges from 5% to 40%. Compared to polyethylene (PE), EVA has reduced crystallinity due to the introduction of vinyl acetate monomers, which enhances its toughness, impact resistance, filler compatibility, and heat-sealing properties. It is widely used in foam shoe materials, functional greenhouse films, packaging films, hot-melt adhesives, wires and cables, toys, and more. In the new energy sector, it is also applied in photovoltaic materials and solar cell adhesives.
Properties
Softness & Elasticity
EVA exhibits rubber-like elasticity and remains flexible even at temperatures as low as -50°C.
Optical & Chemical Properties
It has high transparency, surface gloss, and excellent chemical stability, with strong aging and ozone resistance. It is non-toxic.
Processability & Shock Absorption
EVA is easily processed and molded, and its shock resistance surpasses polystyrene foam (EPS). Unlike traditional foam materials, it can be cut and shaped for protective packaging.
Environmental Compliance & Density
EVA meets eco-friendly standards, making it an ideal choice for export products. Its wide density range allows for diverse applications.
Definition of EVA Packaging Liner
Definition: EVA packaging liners are inserts used inside metal boxes, paper gift boxes, whiteboard boxes, and plastic boxes to protect products (e.g., USB drives, jewelry, knives, precision instruments, and tools).
Classification
By Foaming Type
- Eco-friendly coarse-celled EVA
- Standard EVA
- Food-grade odorless EVA
- Flame-retardant EVA
- Anti-static EVA
By Hardness (Shore A)
- Available in: 25°, 38°, 45°, 50°, 60°, 70°, 80°
- Common industrial uses: 38°–45° for foot pads
- Delicate protection: 25°–38° for electronic components
By Function
- Standard EVA liner
- Flame-retardant EVA liner
- Anti-static EVA liner
By Color
- Black, white, and colored EVA liners
- Industrial preference: Black and white (colored liners are less common)
Manufacturing Process of EVA Packaging Liners
1. Die-Cutting (Punching)
Uses a die and small press to cut EVA sheets.
Limitations: Thickness >3cm may cause uneven edges and depressions around cutouts. Not ideal for thick materials (e.g., 9cm requires layering).
2. CNC Carving
Uses a CNC machine for precise, straight-edged cuts.
Advantage: Can produce thick liners (e.g., 9cm) in one piece (no layering needed).
Advantages of EVA Packaging Liners
Water Resistance
Closed-cell structure prevents water absorption.
Chemical Resistance
Resists seawater, oils, acids, alkalis, and bacteria.
Ease of Processing
No seams, high toughness, and easy to heat-press, cut, glue, or laminate.
Shock Absorption
High elasticity and tensile strength provide superior cushioning for impact protection.
Thermal Insulation
Excellent heat/cold resistance (suitable for extreme temperatures).
Eco-Friendly
Non-toxic, odorless, recyclable, and compliant with EU packaging regulations.
Applications of EVA Packaging Liners
EVA liners are widely used in a variety of industries:
- Jewelry, ceramics, toolboxes, electronics, instruments
- Gift boxes, toys, handicrafts, cosmetics, medical supplies
- Hardware, wine, furniture, lighting, and other foam packaging fields
Frequently Asked Questions (FAQ)
Q: What is EVA and what makes it different from PE?
EVA (Ethylene Vinyl Acetate Copolymer) is a copolymer of ethylene and vinyl acetate. The addition of vinyl acetate reduces crystallinity compared to standard polyethylene (PE), resulting in improved toughness, flexibility, impact resistance, and better compatibility with fillers.
Q: What are the main applications of EVA packaging liners?
They are used as protective inserts inside metal, paper, whiteboard, or plastic boxes. Common items protected include USB drives, jewelry, knives, precision instruments, electronics, cosmetics, and medical supplies.
Q: What is the difference between Die-Cutting and CNC Carving for EVA?
Die-Cutting is best for thinner sheets but can cause uneven edges on materials thicker than 3cm. CNC Carving provides precise, straight-edged cuts and can process thick liners (up to 9cm) in a single piece without needing to layer the material.
Q: Is EVA foam environmentally friendly?
Yes, EVA packaging liners are non-toxic, odorless, recyclable, and fully compliant with EU packaging regulations, making them ideal for export products.
Q: What options are available for EVA liner hardness and color?
EVA hardness typically ranges from 25° to 80° Shore A (with 38°–45° being common for foot pads and 25°–38° for electronics). While colors can be customized, black and white are the standard preferences for industrial applications.