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PET bottle transparency is not good
Reasons: 1、Heating temperature is too high; 2、Heating time is too long; 3、Compressed air contains water; 4、Injection molding blanks themselves are not transparent; 5、Blanket design is not suitable; 6、Blowing and expansion ratio is too small.
Elimination methods: 1, lower the temperature; 2, shorten the heating time; 3, use the dryer to remove water; 4, improve the quality of the embryo tube, select the material and improve the dryness of raw materials; 5, improve the size of the embryo tube design; 6, reduce the diameter of the embryo tube.
PET bottles appear pearl luster white
Reason: 1、heating temperature is too low; 2、uneven wall thickness of embryo tube; 3、thickness of embryo tube is too thick, insufficient heating penetration.
Exclusion method: 1, raise the temperature or slow down the rotation speed; 2, improve the quality of the embryo tube; 3, reduce the thickness of the embryo tube, or try to raise the outer cover of the heating device to increase the temperature of the surface layer of the embryo tube emitted.
PET bottle bottom water spout position deviation
Reason: 1、Blowing time is too early; 2、Stretching rod is not down to the bottom; 3、Stretching rod is offset from the center line of bottle axis; 4、Uneven wall thickness of embryo tube or uneven injection density; 5、Uneven heating.
Elimination methods: 1, delay the blowing time or increase the speed of stretching rod down; 2, adjust the position of the magnetic pole switch; 3, adjust the position of the stretching rod; 4, improve the quality of the embryo tube; 5, improve the heating conditions, or check whether there is a problem with the self-rotation of the embryo tube.
Uneven wall thickness of PET bottle
Causes: 1、Stretching rod position is not in the center of the embryo tube; 2、Blowing hole is not symmetrical and the aperture is not the same; 3、Stretching multiplier is too low or the blowing ratio is too small; 4、The embryo tube does not rotate in the heating furnace; 5、Uneven wall thickness of the embryo tube or uneven injection density.
Elimination methods: 1、Adjust the position of the stretching rod; 2、Adjust the position and aperture of the blowing hole; 3、Increase the stretching multiplier or blowing ratio; 4、Check the self-rotating device; 5、Improve the quality of the embryo tube.
The upper part of the bottle is too thick
Causes: 1, the upper temperature is too low; 2, the location of the mold exhaust hole is too far from the upper; 3, the stretching ratio is too low; 4, the blowing ratio of the upper part of the bottle is too low; 5, the speed of the stretching rod is too slow.
Elimination methods: 1, the upper part of the temperature; 2, adjust the location of the exhaust hole; 3, increase the stretching rate; 4, change the shape of the bottle; 5, adjust the speed of the stretching rod.
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