LDPE Yanshan Petrochemical 1C7A
LDPE Yanshan Petrochemical 1C7A Resin
Material Introduction: LDPE Yanshan Petrochemical 1C7A is low‑density polyethylene specially designed for extrusion coating process. It features excellent processability, outstanding bonding strength for lamination and favorable heat‑sealing performance, widely used in packaging industry.
Main Applications
Yanshan Petrochemical 1C7A is general‑purpose dedicated resin for extrusion coating. It acts as coating layer for composite packaging on various substrates.
Substrate coating: extrusion coating for paper, paperboard, aluminum foil, BOPP, BOPET, BOPA and other plastic films.
Packaging contents: applicable for food, liquid (milk, fruit juice), powder, pharmaceuticals, agricultural supplies and chemical products.
End‑products: laminated paper for paper cups & paper bowls, woven bag coating, transfer label film, photo paper film, flexible composite packaging for food & medicine, aseptic liquid packaging such as Tetra Pak and other mid‑to‑high‑end packaging products.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Test Data / Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D1505 / GB/T 1033.2 | 0.917‑0.919 g/cm³ | Typical LDPE density range. |
| Melt Flow Rate (MFR) | ASTM D1238 (190°C/2.16kg) | 7.0 g/10min | High melt index provides good flowability, suitable for high‑speed extrusion coating. | |
| Rheological Properties | Die Swell Ratio | ‑ | 1.7‑1.8 | Indicates melt expansion after exiting die, affects coating stability and quality. |
| Hygiene & Safety | Food‑contact Compliance | ‑ | Qualified | Non‑toxic, odorless natural pellets. Compliant with FDA regulations and China GB 9691 hygiene standard for food‑contact resin. |
Extrusion Coating Processing
For mainstream extrusion‑coating process, recommended processing temperature: 270‑335 ℃. Actual conditions shall be adjusted according to raw material, equipment and product dimension.
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks |
|---|---|---|
| Barrel Temperature | 160‑210 °C | Temperature rises from rear zone to front zone. LDPE melt is prone to thermo‑oxidative degradation when exposed to oxygen. |
| Nozzle Temperature | 180‑200 °C | ‑ |
| Mold Temperature | 20‑60 °C | ‑ |
| Injection Pressure | Medium‑high pressure | Adjust according to product structure and dimension. |
| Injection Speed | Medium speed | ‑ |
| Back Pressure | 0.5‑1.0 MPa | Excessive back pressure is unnecessary. |
| Screw Speed | 50‑100 rpm | Avoid excessive shear heat accumulation. |
Disclaimer: All above data is for reference only.
