First, the common faults and solutions for the production of stretch blow molding containers
1 The cavity or mandrel of the blank mold is not smooth
Polishing mold cavity or mandrel, chrome plating
2 injected parisons collide with each other when they are out of the mold
The blanks that have just emerged should be arranged in the toolbox in an orderly manner.
1. The parison wall has a confluence line
Large melt pressure loss when forming parison
Progressive melt temperature, improved injection pressure
2, the bottom of the parison falls off
1 parison stretching temperature is low
Progressive billet stretching temperature
2 The temperature at the bottom of the parison is too high
Adjust the temperature of each heating section of the parison, and appropriately increase the heating temperature of other parts except the bottom
3 mechanical stretching speed is too fast
Appropriately reduce the stretching speed of the stretching rod
4 the gate at the bottom of the parison is injured
Improve mold or gate trimming methods
3, the tolerance of the wall thickness is uneven
1 parison tempering time is insufficient, uneven temperature regulation
Increase the temperature adjustment time of the parison, adjust the temperature of the parison and each heating section
2 resin viscosity is too low
Selecting resin with intrinsic viscosity
3 parison wall thickness is uneven
Trimming the shape of the blank mold and the core rod to improve the forming temperature of the parison
4 parison stretching temperature is too high
Reduce the heating temperature of the parison
4, container volume reduction
1 The billet has a low inflation pressure and insufficient inflation time
Set the pressure of the compressed air to increase the blowing time
2 Stretch blow mold exhaust failure
Trimming or adding mold vents
3 parison reheating temperature is low
Properly raise the parison heating temperature
4 The cooling effect of the stretch blow mold is not good
Check and trim the mold cooling system to increase mold cooling
5, container deformation
1 parison temperature is low or temperature difference is too large
Progressive bad reheating temperature, adjusting the temperature of each heating section
2 Stretching ratio is too large
Appropriately reduce the draw ratio and reduce the thickness of the bad wall
3 insufficient inflation pressure
Improve the pressure of compressed air and increase the flow of compressed air
6. The air in the mold cavity is not discharged during blow molding.
4 Trimming the mold cavity to improve mold exhaust performance
5 blow mold temperature is low
Progressive blow mold temperature
7, the neck of the container wrinkles, deformation
1 When the parison is reheated, the neck of the parison is thermally deformed
Improved parison reheating device, adding insulation at the neck of the mold
2 When the parison is stretch blow molded, the parison is stretched prematurely
Adjust the T-Art conditions of stretch blow molding and coordinate the start time of stretching and inflation
8, the container wall has spots
1 Cavity adhesion impurities of stretch blow molding
Clean, polished stretch blow molded cavity
2 The cooling water temperature of the stretch blow mold is too low, causing "sweating" on the surface of the parison.
Properly improve the cooling water temperature of the mold
3 Exhaust gas in the stretch blow mold
Trim the mold and appropriately increase the vent hole of the mold cavity
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