In industrial packaging, the choice of inner liner material plays a key role in product protection, sealing, and durability. Among the most commonly used materials are LDPE (Low-Density Polyethylene) and HDPE (High-Density Polyethylene) inner liners. This article explains the key differences between high-pressure (LDPE) and low-pressure (HDPE) inner liners to help you choose the right material for your packaging needs.
1. What Are High-Pressure and Low-Pressure Inner Liners?
High-Pressure Inner Liner (LDPE): Produced under high-pressure conditions, this film is soft, flexible, and highly transparent.
Low-Pressure Inner Liner (HDPE): Manufactured under low-pressure processing, this film is tougher, less transparent, and has stronger tensile strength.
2. Key Differences Between LDPE and HDPE Inner Liners
| Feature | High-Pressure Inner Liner (LDPE) | Low-Pressure Inner Liner (HDPE) |
|---|---|---|
| Transparency | High, glossy surface | Low, slightly hazy appearance |
| Flexibility | Soft and smooth | Rigid and slightly brittle |
| Tensile Strength | Moderate | High, tear-resistant |
| Sealing Performance | Excellent heat-sealing | Fair heat-sealing |
| Low Temperature Resistance | Good | Excellent |
| Typical Applications | Light-duty packaging (e.g., food, daily use) | Heavy-duty packaging (e.g., chemicals, fertilizer) |
3. How to Choose the Right Inner Liner?
For high transparency and softness, such as in display packaging, LDPE liners are ideal.
For strength, moisture resistance, and heavy-duty needs, HDPE liners offer better performance.
For customized applications, we also provide co-extruded or composite liners that combine the benefits of both materials.
4. Our Inner Liner Solutions
As a professional packaging bag manufacturer, Zhixin Packaging offer a full range of LDPE and HDPE inner liners to suit different types of bags, including laminated paper bags, woven bags with liners, and flexible plastic packaging. All liners are available in customizable thickness and width, tailored to your specific application needs.
Need help selecting the right inner liner?
📧 Email: rain.xu@smartpackbags.com
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