A blow molding machine is standard with pre-blowing pressure between 5-8 kg/cm² or 6-12 bar. The goal of the pre-blow pressure is to inflate the bottle to the desired size, shape, and parameters for high-pressure forming molding. It is based on the shape and size of the bottle to set the specific pre-blow pressure value. Excessive pressure may cause the bottle to burst or have a distorted shape; insufficient pressure may result in inadequate stretching, resulting in a thicker bottom or center. The pre-blow pressure should be adjusted according to the actual operating conditions based on the bottle samples or bottle designs.
The Function of Pre-Blow Pressure
The primary function of pre-blow pressure is to inflate the bottle to the desired size and shape for subsequent molding. Pre-blow pressure varies depending on the shape and size of the bottle. The typical pre-blow pressure range for a blow molding machine is 5-8 kg/cm² or 6-12 bar. This range is suitable for bottles of standard sizes and shapes. Controlling Pre-Blow Pressure.
1. The pressure and air source quality of the compressed air system directly affect the pre-blow pressure control of the blow molding machine. When selecting a compressed air system, the air source size, quality, and pressure should be determined based on the desired pre-blow pressure.
2. Installing a pressure regulator helps the blow molding machine control the pre-blow pressure. Select a regulator with excellent pressure stability and precise adjustment accuracy.
3. Pre-blow pressure depends on the shape and size of the bottle. Before using the blow molding machine to pre-blow bottles, set different pre-blow pressures for various bottle shapes and sizes, and continuously adjust and optimize the pre-blow pressure according to actual conditions.
Notes
1. Avoid blow molding machine setting the pre-blow pressure high, as it prevents bottle bursting or material accumulation.
2. Adjust the pre-blow pressure based on the shape and sizes of the different bottles. It can ensure the quality of the bottles.
3. Check the working air supply quality regularly to keep it dry, free of oil, and water vapor.
4. Check the blow molding machine stability and the accuracy of the pressure regulator regularly. If damage happens, please replace or maintain it promptly.
