Controlling the temperature is very important for proce […]
Controlling the temperature is very important for processing plastic bottles. Let's learn how to control the temperature.
Non-flowing temperature: High temperature at which no flow occurs under a certain pressure. A certain amount of plastic is added to the barrel at the upper end of the capillary rheometer die and heated to a certain temperature. After the constant temperature is known to be 10MIN, a constant pressure of 50MPA is applied. If the material does not flow out of the die, it is difficult to increase the temperature of the material by 10 degrees after depressurizing, and then apply a constant pressure of the same size after holding 10MIN. This continues until the melt flows out of the die, and this temperature is reduced. 10 degrees is the non-flowing temperature of the material. Flowing temperature TF: refers to the temperature at which the amorphous polymer changes from a highly elastic state to a viscous flow state. It is the lower limit of the processing temperature of amorphous plastics.
Decomposition temperature TD: refers to a polymer in a viscous flow state. When the temperature is further increased, the degradation of the molecular chain will be intensified, and the temperature reached when the polymer molecular chain is significantly degraded is the decomposition temperature. Melting temperature TM: For crystallization Type polymer refers to the temperature at which the three-dimensional remote ordered state of the macromolecular chain structure changes to disordered viscous fluid state, also known as the melting point. It is the lower limit of the processing temperature of the crystalline polymer. Glass transition temperature TG: refers to the amorphous polymer The transition temperature from the glass state to the high elastic state or from the former to the former. It is the low temperature of the free movement of the macromolecular segment of the amorphous polymer, and it is also the upper limit of the working temperature of the product.