EVA Packaging Liners from China: Leading Suppliers & Factory for High-Quality Industrial Packaging Solutions
Definition of EVA
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 significantly 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, and toys. In the new energy sector, it is also highly applied in photovoltaic materials and solar cell adhesives.
Properties of EVA
- Softness & Elasticity: EVA exhibits rubber-like elasticity and remains flexible even at temperatures as low as -50°C.
- Optical & Chemical Properties: It features high transparency, surface gloss, and excellent chemical stability, along with strong aging and ozone resistance. It is completely non-toxic.
- Processability & Shock Absorption: EVA is easily processed and molded. Its shock resistance surpasses polystyrene foam (EPS). Unlike traditional foam materials, it can be cut and shaped for protective packaging.
- Environmental Compliance: EVA meets strict eco-friendly standards, making it an ideal choice for export products.
- Density Versatility: Its wide density range allows for diverse industrial applications.
EVA Packaging Liner
1. 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).
2. Classification
(1) By Foaming Type:
(2) By Hardness (Shore A):
Available in 25°, 38°, 45°, 50°, 60°, 70°, 80°.
- Common industrial uses: 38°–45° for foot pads.
- Electronic components: 25°–38° for delicate protection.
(3) By Function:
(4) By Color:
Black, white, and colored EVA liners. (Industrial preference: Black and white; colored liners are less common).
Manufacturing Process of EVA Packaging Liners
Limitations: Thickness >3cm may cause uneven edges and depressions around cutouts. Not ideal for thick materials (e.g., 9cm requires layering).
Advantage: Can produce thick liners (e.g., 9cm) in one piece without layering.
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:
