PET Yizheng Chemical Fiber BG‑80
PET Yizheng Chemical Fiber BG‑80
PET Yizheng Chemical Fiber BG‑80 is a typical blow‑molding bottle‑grade polyester chip. It features high transparency, outstanding tensile strength, excellent impact toughness and food‑contact safety.
Main Applications
Mineral‑water bottles, edible‑oil bottles, cosmetic bottles, pesticide bottles.
Physical Properties
| Property Category | Item | Typical Data | Unit |
|---|---|---|---|
| Basic Physical Properties | Intrinsic Viscosity | 0.791 | dl/g |
| Melting Point | 249 | ℃ | |
| Ash content | 0.03 | % | |
| Chemical Composition | Carboxyl end‑group content | 22 | mol/t |
| Diethylene glycol content | 1.0 | % | |
| IPA content | 1.7 | % | |
| Color & Appearance | Color L value | 89.1 | — |
| Color b value | ‑1.8 | — | |
| Powder content | 35 | mg/kg | |
| Others | Acetaldehyde content | 1 | mg/kg |
| Moisture content | ＜0.1 | % | |
| Crystallinity | 53 | % |
Processing Parameters
| Parameter Group | Recommended Range | Detailed Description |
|---|---|---|
| Pre‑drying | Dehumidification is critical for PET, directly affecting transparency and mechanical performance | |
| Drying temperature | 160‑180℃ | Use dehumidifying dryer, dew point ≤‑40℃ |
| Drying time | ≥4 h | Ensure moisture ≤50 ppm, target ≤30 ppm |
| Hot‑air flow | Medium‑high wind speed | Uniform heating, avoid local overheating & agglomeration |
| Extruder Temperature | Typical 3‑stage screw, L/D≥25:1 | |
| Feed zone(C1) | 250‑265℃ | Prevent premature melting and blockage |
| Compression zone(C2‑C3) | 265‑280℃ | Core plasticizing zone, stable temperature required |
| Metering zone(C4) | 275‑285℃ | Uniform melt fluidity |
| Die head temperature | 275‑285℃ | High temperature will trigger degradation & higher acetaldehyde |
| Mold Temperature | For bottle blow‑molding & injection molding | |
| Hot runner system | 275‑290℃ | Precise control to avoid cold material or decomposition |
| Mold cavity cooling‑water temp. | 10‑15℃ | Fast cooling & shaping, shorten cycle time |
| Screw Parameters | ||
| Screw speed | Adjust by output | Avoid excessive shear heat; torque ≤80% |
| Back pressure | 3‑8 MPa | Improve melt compactness; excessive back‑pressure causes obvious temperature rise |
| Cycle Parameters(Injection‑stretch‑blow) | ||
| Injection time | 2‑5 s | Adjust according to preform weight |
| Blow pressure | 25‑40 bar | Uniform wall‑thickness distribution |
| Cooling time | 8‑15 s | Anti‑deformation upon demolding |
Note: All information above is for reference only!
