LLDPE SECCO LL0220KJ
LLDPE SECCO LL0220KJ Resin
Material Introduction: LLDPE SECCO LL0220KJ is a well‑balanced linear low‑density polyethylene, especially suitable for manufacturing various film products.
Main Applications
Blown films: inner liner bags, various packaging bags, small arch greenhouse films; also used as blending component.
Other film products: applied for industrial packaging films requiring high toughness, benefited from good mechanical properties especially high transverse tear resistance.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Value & Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ISO 1872/1 | 0.921 g/cm³ | Typical density range for LLDPE. |
| Melt Flow Rate (MFR) | ISO 1133 (190°C/2.16 kg) | 2.4 g/10min | Good melt flowability, suitable for film processing. | |
| Comonomer Type | ‑ | Butene | Determines fundamental material characteristics. | |
| Mechanical Properties | Tear Strength (MD) | ASTM D‑1922 | 110 g/25μm | Machine‑direction tear resistance of film. |
| Tear Strength (TD) | ASTM D‑1922 | 300 g/25μm | Transverse‑direction tear resistance, much higher than MD direction. | |
| Elongation at Break (MD) | ISO 1184 | 600 % | Machine‑direction ductility of film. | |
| Elongation at Break (TD) | ISO 1184 | 800 % | Transverse‑direction ductility, superior to MD direction. | |
| Tensile Strength at Break (MD) | ISO 1184 | 36 MPa | Machine‑direction tensile capacity. | |
| Tensile Strength at Break (TD) | ISO 1184 | 28 MPa | Transverse‑direction tensile capacity. | |
| Tensile Yield Strength (MD) | ISO 1184 | 10 MPa | ‑ | |
| Tensile Yield Strength (TD) | ISO 1184 | 11 MPa | ‑ | |
| Dart Drop Impact Strength | ASTM D‑1709 | 110 g | Puncture‑resistance and impact‑resistance; higher value means better performance; note unit discrepancy in partial data sources. | |
| Optical Properties | Haze | ISO 306 | 14 % | Transparency indicator; lower value represents higher transparency. |
| Processing Method | Processing Mode | ‑ | Blown film | Main processing technology. |
Blown‑Film Processing
For mainstream blown‑film extrusion, temperature, pressure and other parameters shall be optimized according to equipment, film thickness and performance requirements.
‑ Processing Temperature: Typical LLDPE blown‑film temperature range 150‑210 ℃; fine‑tune for specific equipment, die and product requirements. ‑ Screw Design: LLDPE features low shear sensitivity and maintains higher viscosity under shear, slightly harder to process than LDPE with identical MFR. ‑ Bubble Stability: LLDPE bubble stability is inferior to LDPE. Dual‑lip air ring is recommended to improve cooling and bubble stability. ‑ Blending for better processability: Many film producers blend LLDPE with LDPE (e.g. 50 % each) to optimize processability and raise output capacity.
General LLDPE Blown‑Film Precautions
‑ Extrusion Temperature: Select proper extrusion temperature and ensure uniform die‑head temperature. Excessively high temperature causes resin degradation and brittle film; insufficient temperature results in poor plasticization, poor gloss & transparency and unmelted crystal nuclei (fish‑eyes). ‑ Blow‑up Ratio: Key control parameter, ratio of bubble diameter to annular die diameter. Higher blow‑up ratio improves transverse strength, yet excessive value leads to bubble instability and film wrinkles. ‑ Draw Ratio: Ratio of take‑up speed to annular extrudate speed. Higher draw ratio enhances longitudinal tensile strength, yet excessive value brings difficulty for thickness control. ‑ Cooling: Sufficient cooling is required; well‑performed die cooling system is necessary.
Disclaimer: All above data is for reference only.
