Plastic film packaging is a thin layer film flexible material—usually polyethylene, polyester, or polypropylene—used to wrap, seal, and protect products. It serves as a durable, waterproof, and air-tight barrier for food, industrial, and consumer goods. Common examples include shrink wrap, bubble wrap, plastic bags, food wraps, greenhouse film, mulch film for agriculture.
| Property | Typical Specification Range | Importance for Film |
|---|---|---|
| Carrier Resin | Matched to base polymer (e.g., PE carrier for PE film) | Ensures complete compatibility and dispersion in the final product |
| Dosage (Let-down Ratio) | Typically 1%, depending on required biodegradable rate | Dictates cost-effectiveness and processing parameters |
| Physical Form | Free-flowing pellets, dust-free | Ensures ease of handling and consistent automated dosing |
| Melt Flow Index (MFI) | Compatible with base resin MFI | Guarantees proper dispersion without processing issues |
| Moisture Content | Very low (typically <0.2%) | Prevents defects such as fish-eyes or voids during extrusion |
| Particle Size Distribution | Typically 50–60 microns | Maintains film clarity and avoids surface defects |
| Thermal Stability | Withstands high processing temperatures | Prevents additive degradation or burning |