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Blowing Machine

Problems and causes of blow molding machine products

by:Yosion Machinery     2022-08-21
As a plastic product producer, the bottle blowing machine sprays liquid plastic, and uses the wind generated by the machine to blow the sprayed plastic onto the mold cavity of a specific shape, and cools it to form the product to be produced. This method Greatly improved production efficiency. In the daily production process, there will be some problems with bottle blowing machine products. Let's take you to understand these problems and the reasons. 1. The transparency of the product is not good. The reasons may be: the preform is opaque, the secondary heating temperature is too high, the secondary heating time is too long, the blowing air contains moisture, and the surface of the blowing mold is rough. Solutions: 1. Dry raw materials, use high-transparency parisons 2. Lower the oven temperature 3. Shorten the heating time 4. Use a freeze dryer to remove moisture 5. Polish the mold surface. 2. The position of the gate at the bottom of the product appears pearly white and white. The reasons are: the blowing temperature of the preform is too low, the blowing time is too advanced, the temperature of the preform is uneven, and the drawing line speed is too low. Solution: 1. Increase the secondary heating temperature and prolong the secondary heating time 2. Slow down the blowing time 3. Change the temperature distribution of the oven 4. Increase the drawing line speed. 3. The product cannot be formed due to the following reasons: insufficient blowing air pressure, insufficient blowing air flow, too slow blowing air pressure rise, excessive stretching force, and unequal secondary heating speed. Solutions: 1. Increase the air pressure 2. Increase the air flow 3. Improve the pressure regulating structure and increase the air pressure rising speed 4. Select a reasonable tensile force during design 5. Adjust the temperature of the baking oven. Fourth, the wall thickness of the product is uneven, the reasons are: uneven wall thickness of the parison, uneven temperature of the parison, too low stretch separation rate, stretch rod offset, etc. Solutions: 1. Adjust the preform 2. Adjust the temperature distribution of the oven 3. Increase the stretching ratio 4. Adjust the stretching rod. 5. The middle of the product is thin, the reasons are: the temperature of drawing and blowing is too high, the temperature of the middle of the parison is too high, etc. Solution: lower the blowing temperature and lower the heating temperature in the middle of the oven. 6. The upper part of the product is thin and the bottom part is thick. Reasons: the line speed of the drawing and blowing is too high, the blowing time is improperly selected, and the drawing and blowing temperature is not appropriate. Solution: 1. Lower the temperature of the stretch blowing. 2. Advance the blowing time slightly. 3. Adjust the heating temperature of the oven, reduce the temperature of the bottleneck part, and increase the temperature of the bottom part. 7. The bottom of the product is thin and the upper part is thick. Reasons: the speed of the drawing and blowing line is too low, the blowing time is improperly selected, and the drawing and blowing temperature is not appropriate. Solutions: 1. Increase the drawing and blowing speed 2. Delay the blowing time 3. Increase the temperature of the upper part of the oven , lowering the bottom temperature blowing personnel should always pay attention to check the quality of the bottle. Zhangjiagang Co., Ltd. is a manufacturer engaged in the research and development of automatic blow molding machines. Over the years, the company has acquired a set of relatively mature production technology and manufacturing process on the basis of learning from foreign advanced technology and combining with the company's many years of experience in producing hollow blow molding machines. The company provides a complete set of pre-sales and after-sales services such as installation and commissioning, maintenance, training, technical consultation, etc. With advanced technology, reliable quality, reasonable price and perfect after-sales service, the company strives to make you obtain the best products and services.
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