The Temperature Problem of the Blowing Moulding Machine

Update:03 Sep 2018

When operating a hollow blowing molding machine, you mu […]

When operating a hollow blowing molding machine, you must pay attention to some temperature control to ensure the production of a suitable plastic bottle.


Melting temperature TM: For a crystalline polymer, the temperature at which a three-dimensional remote ordered state of a macromolecular chain structure is transformed into a disordered viscous state, also called a melting point. It is the lower limit of the processing temperature of the crystalline polymer molding.


Glass transition temperature TG: refers to the transition temperature of an amorphous polymer (including an amorphous portion in a crystalline polymer) from a glassy state to a high elastic state or by the latter. It is the lowest temperature for the free movement of the macromolecular segment of the amorphous polymer, and is also the upper limit of the working temperature of the product.


Third, no flow temperature: the highest temperature that does not flow under a certain pressure. The automatic blow molding machine adds a certain amount of plastic to the barrel at the upper end of the capillary rheometer die, and heats it to a certain temperature. After the temperature is known, the new 10MIN is applied, and 50MPA constant pressure is applied. If the material does not flow out of the die, unloading After the pressure, the temperature of the material is raised by 10 degrees, and after the temperature is kept for 10 minutes, a constant pressure of the same magnitude is applied, and this is continued until the melt flows out of the die, and the temperature is reduced by 10 degrees, which is the non-flowing temperature of the material.


Fourth, the flow temperature TF: refers to the temperature of the amorphous polymer from a high elastic state to a viscous flow state. It is the lower limit of the processing temperature of amorphous plastic. Decomposition temperature TD: refers to the polymer in the viscous flow state, when the temperature is further increased, the degradation of the molecular chain is intensified, and the temperature at which the polymer molecular chain is significantly degraded is the decomposition temperature.


The above five points are our summary of how to pay attention to the temperature of the hollow blow molding machine in production, but in general it is not just these five points, which requires us to constantly sum up experience in daily work, in order to discover its problems exist.

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