How to adjust the temperature of automatic bottle blowing machine

September 28, 2021

In the process of Automatic Bottle Blowing Machine, we must pay attention to some temperature control to ensure the proper plastic bottle.

1. Melting temperature (TM): for crystalline polymers, it refers to the temperature at which the three-dimensional long-range ordered state of macromolecular chain structure changes into disordered viscous flow state, also known as melting point. It is the lower limit of processing temperature of crystalline polymer.

2. Glass temperature(TG): refers to the transition temperature of amorphous polymer (including the amorphous part of crystalline polymer) from glassy state to high elastic state or from the latter to the former. It is the lowest temperature for the free movement of the macromolecular segment of the amorphous polymer and the upper limit for the working temperature of the product.

3. No flow temperature: the highest temperature at which no flow occurs under a certain pressure. The full-automatic Bottle Blowing Machine is to add a certain amount of plastic into the barrel at the upper end of the mouth mold of the capillary rheometer, heat it to a certain temperature, keep the constant temperature for 10min, apply 50MPa constant pressure, if the material does not flow out of the mouth mold, increase the material temperature by 10 degrees after pressure relief, keep the temperature for 10min, and then apply constant pressure of the same size, so as to continue until the melt flows out of the mouth mold, reduce the temperature 10 ℃ is the non flowing temperature of the material.

4. Flow temperature (TF): refers to the temperature at which the amorphous polymer changes from high elastic state to viscous flow state. It is the lower limit of processing temperature of amorphous plastics.

5. Decomposition temperature (TD): when the temperature of polymer in viscous flow state increases further, it will aggravate the degradation of molecular chain. When the temperature rises to make the polymer molecular chain degrade obviously, it is the decomposition temperature.

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