LLDPE Daqing Petrochemical DFDA‑7042
LLDPE Daqing Petrochemical DFDA‑7042 Resin
Material Introduction: LLDPE Daqing Petrochemical DFDA‑7042 is widely‑applied linear low‑density polyethylene. The pellets are non‑toxic, tasteless and odorless. It gains high popularity in film manufacturing field for favorable mechanical properties, excellent environmental‑stress‑crack‑resistance and relatively high transparency.
Main Applications
Packaging films: industrial packaging film, heavy‑duty packaging bags, frozen‑food packaging bags, shrink packaging film, liner film, general‑purpose industrial and food packaging bags.
Agricultural films: agricultural mulch films, vegetable greenhouse films.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Value & Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | GB/T 1033 | 0.917‑0.923 g/cm³ | Typical density range for LLDPE. |
| Melt Flow Rate (MFR) | GB/T 3682 (190°C/2.16kg) | 1.5‑2.5 g/10min | Good melt flowability, suitable for film processing. | |
| Mechanical Properties | Tensile Yield Strength | GB/T 1040 | ≥8.3 MPa | Indicator of tensile‑deformation resistance. |
| Tensile Strength at Break | GB/T 1040 | ≥12.0 MPa | Maximum stress the material can withstand before fracture. | |
| Elongation at Break | GB/T 1040 | ≥500 % | Good toughness and ductility, resistant to fracture under large deformation. | |
| Optical Properties | Haze | GB/T 2410 | 14 % (typical value) | Low haze delivers good transparency to meet packaging display requirements. |
| Film Appearance | Fish‑eye (0.8 mm) | GB/T 15182 | 8 pcs/1520cm² | Film quality indicator; lower value means better uniformity and fewer impurities. |
| Fish‑eye (0.4 mm) | GB/T 15182 | 40 pcs/1520cm² | Same as above. | |
| Cleanliness | Contaminated Pellets | SH/T 1541 | 40 pcs/kg | Purity indicator; fewer particles represent higher material cleanliness. |
Extrusion & Blown‑Film Process
| Process Stage | Parameter Suggestion & Range | Description |
|---|---|---|
| Processing Temperature | 160‑230 °C | Comprehensive operating range. Pelletizing temperature for similar formulations:180‑215 ℃; extrusion blow‑molding for PE heat‑seal film:215‑230 ℃. |
| Blow‑up Ratio | 2‑4 | Reference for PE greenhouse film formula, balances machine‑direction and transverse‑direction film performance. Ratio of bubble diameter vs die annular diameter. |
| Draw Ratio | Matched with blow‑up ratio | Ratio of film take‑off speed vs tube extruding speed. Typical LDPE draw ratio:4‑6. Cooperate with blow‑up ratio to achieve uniform film thickness. |
| Screw Speed | 30‑50 r/min | Based on φ65 mm extruder for greenhouse film production. Adjust according to actual extruder specification and output demand. |
Disclaimer: All above data is for reference only.
