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What are the Uncertainties in the Production of Blow Molding Machines?

Update:14 Dec 2019


In the production of automatic blow molding 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 length of the nozzle at the bottom of the bottle varies. In severe cases, the length of the tube is not enough to make the product not blown. The reasons for the unstable weight are as follows:

1. The temperature control of the blow molding machine is inaccurate or the temperature deviation is large in the production. The installation position of the temperature measuring point  is unreasonable, causing the temperature to have a periodic deviation. As the temperature deviation increases, the weight deviation also increases. When the temperature rises, the extrusion barrel is stretched more, and in the same operation cycle, the nozzle material of the bottom of the bottle is increased, and the weight of the product is reduced. When the temperature is low, the weight of the product is increased. When the the rmocouple has poor contact, there is a similar failure. If the the mocouple is broken, the extrusion amount is reduced, and when the temperature is lower than the melting point of the plastic, the motor current increases. Can not be extruded below the melting point of plastic. Whether the installation position of the thermocouple is reasonable and the size of the temperature control of the the rmocouple measuring point will directly affect the smoothness of extrusion.

2. The running time of the two mold frames is inconsistent (the difference is too large). If the flow rate of the material pipe is downward, the time difference between the two sides of the left and right mold frames is large, and the weight of the two sides is unstable. The mold frame runs faster and the weight is heavier, and the mold frame runs slower because of the lighter weight. The solution is to adjust the two side mold bases to make the running time close.

3. The extrusion amount is unstable, and the extrusion amount is unstable due to the unstable rotation speed of the motor and the unsuitability of the lightness of the belt.