The IV of Wankai materials are stable
Fast reheat
Nice in Color value
For Cola bottle and Carbonated soft drink bottle
“WANKAI” Brand 'WK851" PET resin bottle grade is TPA-based polyethylene terephthalic copolymer. It is a high molecular weight polymer giving enhanced properties for reheat blow stage of bottle production.
Keeping the similiar properties of WK881, it is characterized by lower energy consumption but higher production rate duiring bottle production. Because of the additive,it looks darker, but the final bottle keeps the clarity as WK881's.
The following table provides the parameters that characterize the grade.
| Intrinsic Viscosity (IV) | dL/g | 0.85 | ±0.02 | |
| Acetaldehyde Content | ppm | 1 | max | |
| Color (L-value) | -- | 70 | min | |
| Color (b-value) | -- | 1 | max | |
| Melting point | °C | 243 | ±2 | |
| Moisture Content | %wt | 0.4 | max | |
| Weight of 100 chips | g | 1.55 | ±0.1 |
Drying
Drying is necessary prior to the melt processing to prevent the resin from hydrolysis.Typical drying conditions are an air temperature of 160-175°C, 4-6 hours residence time.
