How to adjust the temperature of the automatic blow molding machine

1. Temperature adjustment of automatic bottle blowing machine

When the automatic bottle blowing machine is processing, some temperature control must be paid attention to to ensure that a suitable plastic bottle is manufactured.

1. Melting temperature TM: For crystalline polymers, it refers to the temperature at which the three-dimensional remote ordered state of the macromolecular chain structure transforms into a disordered viscous fluid state, also known as the melting point. It is the lower limit of the crystalline polymer molding processing temperature.

2. Glass transition temperature TG: refers to the transition temperature of an amorphous polymer (including the non-crystalline part of a crystalline polymer) from a glass state to a high elastic state or from the latter to the former. It is the lowest temperature at which the macromolecular segment of the amorphous polymer can move freely, and it is also the upper limit of the working temperature of the product.

3. No-flow temperature: the highest 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, and apply a constant pressure of 50MPA after the constant temperature is known to be new. If the material does not flow out of the die, unload it. After pressing, it is difficult to increase the temperature of the material by 10 degrees. After holding for 10min, apply the same constant pressure, and continue until the melt flows out of the die. Decrease this temperature by 10 degrees to be the no-flow temperature of the material.

4. Flow 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.

5. Decomposition temperature TD: When the temperature of a polymer in a viscous fluid state is further increased, the degradation of the molecular chain will be aggravated, and the temperature at which the molecular chain of the polymer is significantly degraded is the decomposition temperature.

2. Adjusting the production speed of the bottle blowing machine

By increasing the exhaust time and increasing the saturation time to slow down the speed, while reducing the overall temperature of the light box, each increase of 0, 1S light box temperature needs to reduce the overall temperature by 1%, increasing the speed and reducing the speed operation is the opposite. (The minimum exhaust time is 0, 8S, below 0, 8S, there will be a phenomenon of bottle skipping due to untimely exhaust) Regardless of the speed increase or decrease, the speed should not be too fast, and the maximum change is 0, 3S after a period of time. Observe the quality of the bottle, and adjust the speed after the quality of the bottle is stable. Every time you adjust the speed, you must carefully observe the quality of the bottle and adjust the temperature of the light box at any time. Every time the blowing cycle changes 0, 1S, the bottle output will change about 50 per hour. The blowing machine should adjust the blowing speed according to the speed of the filling machine.