In the process of extrusion
blow molding, there are always many technical problems. The following is the reason why the Zhizhi Plastics Network shares the problems and the corresponding solutions. I hope to provide suggestions for solving the problems.
First, the longitudinal wall thickness of the blow molded product is uneven:
cause:
1 parison sag is serious
2 blow molding products longitudinal two cross-sectional diameters differ too much
solution:
1Reducing the melt temperature of the parison, increasing the extrusion speed of the parison, replacing the resin with a lower melt flow rate, and adjusting the parison control device
2 Appropriate change of product design, using bottom blowing method
Second, the lateral thickness of the blow molded product is uneven:
cause:
1 parison extrusion skew
2 The mold sleeve has a large temperature difference between the inside and the outside of the core
3 product shape is asymmetrical
4 parison blow ratio is too large
solution:
1Adjust the deviation of the gap width of the die to make the wall thickness of the parison uniform; before the mold is closed, the straightening type is bad.
2 Raise or reduce the heating temperature of the mold sleeve to improve the temperature deviation inside and outside the mold
3 Pre-clamping and pre-expansion of the parison before closing the mold, so that the parison is appropriately deflected toward the thin wall
4 reduce the billet blow ratio
Third, the appearance of blow molding products appears orange peel pattern or pitting:
cause:
1 mold exhaust failure
2 mold leaks or condensation in the mold cavity
Poor plasticization of the 3 parison, melt fracture of the parison 4 Insufficient inflation pressure
5 inflation speed is slow
6 inflation ratio is too small
solution:
1 mold parison is sandblasted, additional vent hole
2 repair the mold, adjust the mold cooling temperature to above the "dew point"
3 reduce the screw speed and increase the heating temperature of the extruder
4 lift inflation pressure
5 Clean the compressed air passage and check if the blower is leaking
6 Replace the mold sleeve and core to increase the blow ratio of the parison
Fourth, the volume of blow molding products is reduced:
cause:
1 parison wall thickness increases, resulting in thickening of the product wall
2 product shrinkage rate increases, resulting in shrinking product size
3The inflation pressure is small, and the product is not inflated to the cavity design size.
solution:
1 adjust the program control device to reduce the parison wall thickness; increase the parison melt temperature and reduce the parison die expansion ratio
2Replace the resin with small shrinkage, prolong the blowing time and reduce the mold cooling temperature.
3 properly raise the pressure of compressed air
5. The outline or graphic of the blow molded product is not clear:
cause:
1 cavity exhaust failure
2 low inflation pressure
3 parison melt temperature is low, material plasticization is poor
4 mold cooling temperature is low, the mold has "condensation" phenomenon
solution:
1 repair mold, cavity blasting or add exhaust vent
2 increase the inflation pressure
3 Appropriately increase the heating temperature of the extruder and the head, and if necessary, add an appropriate amount of filler masterbatch.
4 adjust the mold temperature to above the dew point temperature
6. Blowing products are too much and too thick:
cause:
1 mold expansion mold, insufficient clamping pressure
2 mold edge wear, guide column offset
3 when the inflation is inflated, the parison is skewed
4 The escape groove at the edge of the blank is too shallow or the depth of the blade is too shallow.
5 parison inflation started too early
solution:
1 Lifting mold clamping pressure, suitable for reducing inflation pressure
2 repair the mold edge, correct or replace the mold guide column
3 Correct the center position of the parison and the blowing rod
3 trim the mold to deepen the depth of the escape trough or knife
4 adjust the parison inflation time
Seven, there are too deep vertical stripes:
cause:
1 die dirty
2 mold sleeve, burr or notch on the edge of the core
3 color masterbatch or resin decomposition produces dark stripes
4 filter mesh hole, material mixed with impurities deposited in the die
solution:
1 use a copper knife to clean the die
2 trimming the die
3 Properly lower the temperature and replace the disperse color masterbatch
4 Replace the filter plate and use the scraped scrap
Eight, the embryo is blown during molding:
cause:
1 mold blade is too sharp
2 parisons have impurities or bubbles
3 inflation ratio is too large
4 parison melt strength is low
5 parison length is insufficient
5 type blank wall is too thin or the parison wall thickness is uneven
6The container bursts when the mold is opened (the deflation time is insufficient)
7 mold clamping force is insufficient
solution:
1 Appropriately increase the width and angle of the knife edge
2 use dry raw materials, use dry materials after drying, use clean materials; clean the die
3 Replace the mold sleeve, the core, reduce the bad blow ratio
4 Replace the appropriate raw materials, properly reduce the melt temperature
5 Check the control device of the extruder or storage cylinder head, reduce the variation of process parameters, increase the length of the parison 6 replace the mold sleeve or core, thicken the parison wall; check the parison control device; adjust the die gap
7 adjust the deflation time or delay the mold start time
8 Lifting the clamping pressure or reducing the inflation pressure
Nine, blow molding products are difficult to demould:
cause:
1 product inflation cooling time is too long, mold cooling temperature is low
2 poor mold design, burr on the cavity surface
3 When the mold is opened, the moving speed of the front and rear templates is not balanced.
4 mold installation error
solution:
1 Properly shorten the billet inflation time and raise the mold temperature
2 trimming the mold; reduce the groove depth, the slope of the rib is 1:50 or 1:100; use the release agent
3 Repair the clamping device so that the front and rear templates move at the same speed
4Re-install the mold to correct the installation position of the two mold halves
Ten, the quality of blow molding products fluctuates greatly:
cause:
1 parison wall thickness suddenly changes
2 mixed corner blending material is unevenly mixed
3 The feed section is clogged, causing the extruder to fluctuate
4 heating temperature is not balanced
solution:
1 repairing parison control device
2 Use a good mixing device to extend the mixing time; if necessary, reduce the amount of corner return
3 remove the agglomerates at the mouth
4 material or foreign matter. Reduce the temperature at the mouth
5 replacement electric heating cabinet
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