EVA Packaging Liner from China Factory - Quality Suppliers for 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 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 of EVA
EVA exhibits rubber-like elasticity and remains flexible even at temperatures as low as -50°C.
It features high transparency, surface gloss, and excellent chemical stability, along with strong aging and ozone resistance. It is completely non-toxic.
EVA is easily processed and molded. Its shock resistance surpasses polystyrene foam (EPS). Unlike traditional foam materials, it can be easily cut and shaped for protective packaging.
It meets strict eco-friendly standards, making it an ideal choice for export products. Its wide density range allows for highly diverse applications.
EVA Packaging Liners
Definition: EVA packaging liners are protective inserts used inside metal boxes, paper gift boxes, whiteboard boxes, and plastic boxes to protect products such as USB drives, jewelry, knives, precision instruments, and tools.
- Eco-friendly coarse-celled EVA
- Standard / Flame-retardant EVA
- Food-grade odorless EVA
- Anti-static EVA liner
- Available Shore A Hardness: 25°, 38°, 45°, 50°, 60°, 70°, 80°
- 38°–45° commonly used for foot pads
- 25°–38° ideal for electronic components
- Colors: Black and white (industrial preference), and colored options
Manufacturing Process
Uses a die and small press to cut EVA sheets. Note that thicknesses exceeding 3cm may cause uneven edges and depressions around cutouts. It is not ideal for very thick materials (e.g., 9cm requires layering).
Uses a CNC machine for precise, straight-edged cuts. The main advantage is the ability to produce thick liners (e.g., 9cm) in a single piece without needing any layering.
Advantages & Applications
- Water & Chemical Resistance: Closed-cell structure resists water, oils, acids, alkalis, and bacteria.
- Easy Processing: Seamless design with high toughness; easy to heat-press, cut, glue, or laminate.
- Cushioning & Insulation: High elasticity and tensile strength provide superior shock absorption and thermal insulation.
- Eco-Friendly: Non-toxic, odorless, recyclable, and compliant with EU packaging regulations.
EVA packaging liners are widely utilized across various industries, including:
- Jewelry, ceramics, cosmetics, and medical supplies
- Electronics, precision instruments, and toolboxes
- Gift boxes, toys, handicrafts, and hardware
- Wine packaging, furniture, lighting, and other protective foam applications
Frequently Asked Questions
What is EVA and what are its primary uses?
EVA (Ethylene Vinyl Acetate Copolymer) is a flexible copolymer commonly used in foam shoe materials, packaging films, hot-melt adhesives, solar cell adhesives, and protective packaging liners due to its excellent impact resistance and toughness.
What are the key advantages of using EVA packaging liners?
EVA packaging liners offer superior water resistance, chemical resistance, ease of processing, exceptional shock absorption, thermal insulation, and eco-friendly compliance with EU packaging standards.
How do I choose between Die-Cutting and CNC Carving for EVA liners?
Die-cutting is cost-effective but limited to materials under 3cm in thickness to prevent edge depressions. CNC carving is highly precise, produces straight edges, and can cut thick liners up to 9cm in a single piece without layering.
What Shore A hardness levels are available for EVA packaging?
EVA is available in various Shore A hardness levels, including 25°, 38°, 45°, 50°, 60°, 70°, and 80°. Typically, 38°–45° is preferred for industrial foot pads, while 25°–38° is ideal for cushioning delicate electronic components.
Is EVA material environmentally friendly?
Yes, EVA packaging liners are non-toxic, odorless, completely recyclable, and compliant with international environmental and EU packaging regulations, making them ideal for export goods.