When the fully automatic bottle blowing machine is processing, it is necessary to pay attention to some temperature control to ensure the production of suitable plastic bottles.
- Melting temperature TM
For crystalline polymers, it refers to the temperature at which the three-dimensional long-range ordered state of the macromolecular chain structure transforms into a disordered viscous flow state, also known as the melting point. It is the lower limit of the molding processing temperature of crystalline polymers.
- Glass transition temperature TG
It refers to the transition temperature of amorphous polymers (including the non-crystalline part of crystalline polymers) from glassy state to highly elastic state or from the latter to the former. It is the low temperature for the free movement of amorphous polymer macromolecular segments and the upper limit of the working temperature of the product.
- Non-flowing temperature
The high temperature at which no flow occurs under a certain pressure. The automatic bottle blowing machine is to add a certain amount of plastic into the barrel at the upper end of the capillary rheometer die, heat it to a certain temperature, keep the temperature constant for 10 minutes, and apply a constant pressure of 50MPA. If the material does not flow out of the die, the material temperature will be increased by 10 degrees after the pressure is released, and the same constant pressure will be applied again after keeping the temperature for 10 minutes. This will continue until the melt flows out of the die. Subtracting this temperature by 10 degrees is the non-flow temperature of the material.
- Flow temperature TF
Refers to the temperature at which amorphous polymers change from a high elastic state to a viscous flow state. It is the lower limit of the processing temperature of amorphous plastics.
- Decomposition temperature TD
Refers to the polymer in a viscous flow state. When the temperature is further increased, the degradation of the molecular chain will be aggravated. The temperature at which the polymer molecular chain is significantly degraded is the decomposition temperature.