defect
the reason
Method of exclusion
Blast white at the bottom of the preform
1. Hot runner temperature is less than 2. Insufficient material temperature
1. Strengthen insulation measures 2. Increase the temperature of the hot nozzle. Appropriately increase material temperature 4. Accelerate injection speed. Reduce the pressure 6. Slow down the cooling water flow rate
1. Insufficient drying of raw materials 2. Insufficient plastic raw materials 3. The preform wall thickness is too large or the cooling is insufficient. Mix in other plastics. Material temperature is too low
1 Guaranteed to dry for more than four hours 2. Increase material temperature 3. Increase the screw speed 4. Check whether the temperature of the drying material is too small or the injection volume does not match. The raw material must be dried at 165 degrees until the moisture content is less than 0.02%. Strengthen cooling and change wall thickness
Bottle blanks become opaque by transparency
Stripping temperature is too high
1. Strengthen the cooling water 2. Extended cooling time Change the injection time
Foam on the side of the preform
1. The pressure is too high. Base film gate eccentricity
1. Reduce pressure 2. Fix the mold
Preforms have silver lines or yellow
Plastic decomposition
1. Reduce the drying temperature and extend the drying time. Adjust the injection speed 3. Reduce the material temperature 4. Reduce heat nozzle temperature
Bottles have bubbles
Insufficient drying
1. Strengthen drying Increase the material temperature 3. Reduce screw speed
There are irregular ring grooves in the preform
Moisture condensation in the core cavity
1. Strengthen workshop drying 2. Increase cooling water temperature 3. Dry the mold
The preform is pulled at the gate
1. Hot runner mouth and gate are not the same. Gate down buckle 3. Gate area too hot
1. Fix the mold 2. Fix the gate 3. Extend the cooling time 4, increase the injection speed or injection time. Enhanced gate insulation
Bottle mouth is not full or there is no dissolution pattern
1. Bad exhaust 2. Injection eccentricity
1. Increase the exhaust slot 2. Clean lip mold 3. Reduce the injection speed. Correct mold bottom mold hole
Preformed edge thick edge
1. Poor mold manufacturing 2. Gate hole deviation 3. Injection pressure is too high. Core shift
1. Fix the mold 2. Increase material temperature 3. Reduce the pressure 4. High-strength, high-precision and core-adjustable molds
Defective preform surface
1. The material temperature is too high. The injection speed is too short. The pressure is too short 4. Injection time is too short. Insufficient cooling
1. Reduce material temperature 2. Reduce the injection speed. Increase the pressure 4. Increase the injection time 5. Increase water pressure
Bottle preform gate drawing
1. Bad insulation 2. Insufficient cooling. There is pressure in the heat flow. Bad screw check reverse 5. Pressure is too low
1. Ensure that the gate section is insulated. Increase cooling. Strengthen the reverse cable. Clean up the screw nozzle 5. Increase pressure
After the preform is stripped
1. Gate hole eccentricity 2. Uneven cooling
1. Fix the mold 2. Reduce pressure 3. Increase the injection speed. Extended cooling Clean waterways 6. Increase cooling water pressure
After the preform is heated and bent, 1. The preform is eccentric 2. The temperature adjustment hole or the temperature adjustment base is eccentric 3. The density of the preform is different. Fix the mold 2. Correct temperature adjustment positioning part 3. Reduce the temperature adjustment, especially the bending part of the thermostat temperature Blowing the bottle Partial white bottle Embryo Insufficient temperature increase Preform temperature and internal and external homogeneity After preform tempering Whitening In the whitish segment Preform temperature is too high to ensure that the preform is in 80 degrees to 110 degrees blown bottle blown without inflation 1. Insufficient gas pressure 2. Bottle preform temperature adjustment insufficient 3. Bottle preform injection defect 1. Increase pressure gas volume 2. Increase embryo temperature 2. Check the preform for softening with 100 degrees boiling water Evenly pull through the embryo base 1. Embryo temperature is too high 2. Embryo temperature is too low 3. Plastic degradation is severe 1. Adjust embryo temperature 2. Racha to replace preforms and raw materials to enhance drying preform eccentricity 1. Blow too soon 2. Wind pressure is too high 3. Stretch rod and bottom misalignment. Bottleneck eccentricity serious 5. Stretch rod speed is too slow Stretch rod is greater than 1.5mm from the bottom mold
7. The temperature of the preform is too high. Slow down delay blow time 2. Reduce wind pressure 3. Correct the installation status 4. Check the correct preform condition 5. Adjust the tension cylinder pressure 6. Adjust the end of the stretch rod to the bottom mold 1-1.5mm
7. Decrease the temperature at the lower end of the bottle. The bottle is not blowing in the vertical direction. Dissatisfaction with some thermostats is too high. Dissatisfaction with part of the bottle has a cold block 3. Wind pressure less than 4. Bad blowing mold exhaust 5. Blow mold temperature too high The preform wall is too thin. The longitudinal stretch ratio of the bottle is less than 1. Adjust the preform temperature 2. Do not touch the heated body, check if the cold block touched 3. Increase the air pressure of the stored gas. 4. Increase the exhaust 5. Add cooling water to the blow mold. Correct the mold 7. Increase the stretch ratio (longitudinal). Bottle preform eccentric 2. Uneven temperature adjustment 3. Bad exhaust Improved preform mold 2. Improve temperature control equipment 3. Reduce the temperature of the defective part of the preform. Increase the exhaust bottle at the bottom of the "crater"-like raised the bottom of the bottle is too cold or other parts of the preform temperature is too high earlier blowing time, adjust the temperature adjustment after blowing the bottle partially white. Local thermoregulation is less than 2. The local stretch ratio is too large. There is moisture in the compressed air. Increase preform temperature 2. Check the preform design 3. Strengthen the poor vertical bearing capacity of the filter oil filter jar. Uneven wall thickness 2. The temperature of the preform is too high 3. Bottle shape is bad 1. Improve the wall thickness of the bottle As far as possible low temperature high pressure molding 3. Improve the bottle design bottle easily fall below 1. The bottom wall thickness is not properly stretched. Degradation of plastics Improve the bottom draw ratio. Strengthen raw materials before injection Reducing the production temperature There are pits and white fog in the bottle. Blowing in dirty air Humidity in the air Set air filter device 2. Reduce the humidity of the blown air. The bottle is too soft. Bad design 2. Processing temperature is too high Improve design 2. As far as possible at the low temperature injection and blow molding bottle blow molding after the foul odor 1. Warming too high 2. Bad compressed air 3. Use inferior materials 1. Lower blowing temperature Finishing air compressor and filter 3. After using the regular bottle of water for a period of time, the water will taste bad. The acetaldehyde content of the bottle is too high. Inappropriate raw materials Low temperature injection and blowing Check the content of acetaldehyde before raw materials processing, eliminate inferior materials
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