Uncertain factors in the use of bottle blowing machine

Uncertain factors in the use of bottle blowing machine

　　In the production of bottle blowing machines, the weight of the product is often unstable, and the weight of the product exceeds the specified deviation. The characteristic of unstable weight is that the nozzle material at the bottom of the bottle has different lengths. In severe cases, the length of the material tube is not enough to make the product not blown. The main reasons for the unstable weight are as follows:

　　 1. Inaccurate temperature control or large temperature deviations during production, and unreasonable installation positions of temperature measurement points (thermocouples) will cause periodic deviations in temperature. As temperature deviations increase, the deviations that affect weight also increase. When the temperature rises, the extrusion barrel stretches more. In the same operating cycle, the nozzle material at the bottom of the bottle increases and the product weight is reduced. When the temperature is low, the weight of the product increases. When the thermocouple has poor contact, there will be similar failures. If the thermocouple is broken, the extrusion volume will decrease. When the temperature is lower than the melting point of the plastic, the motor current will increase. It cannot be extruded below the melting point of the plastic. Whether the installation position of the thermocouple is reasonable and the temperature control area of ​​the thermocouple measuring point will directly affect the smoothness of extrusion.

　　2. The running time of the two mold bases is inconsistent (the difference is too large). If the material pipe flows downward at a constant speed, when the running time of the left and right mold bases differ greatly, the weight on both sides will be unstable. The quicker the mold base has a heavier weight, and the slower mold base has a lighter weight due to stretching. The solution is to adjust the mold bases on both sides to make the running time close.

　　3. The extrusion volume is unstable, and the extrusion volume is unstable due to the unstable rotation speed of the motor and the improper belt tightness.

　　4. The reason for the plastic raw materials is that the output is different due to the change of different plastic raw materials or the mixing ratio. The amount of nozzle material added (percentage) often changes when it affects the extrusion volume.