What does it mean to have pitting

Is it pearl white or not transparent. I have found some common problems for you to deal with. You see if there is a needed answer.
Fault 1: PET bottle transparency is not good
Reasons: 1. The heating temperature is too high. 2. The heating time is too long. 3. The compressed air contains water. 4. The injection embryo tube itself is opaque. 5. The embryo tube design is not suitable. 6. The expansion ratio is too small.
Elimination methods: 1. Cool down 2. Shorten heating time 3. Use a dryer to remove water 4. Improve embryo tube quality, select materials and increase raw material dryness 5. Improve embryo tube size design 6. Reduce embryo tube diameter
Trouble 2: The PET bottle appears pearly luster and white
Reasons: 1. The heating temperature is too low 2. The wall thickness of the embryo tube is uneven 3. The thickness of the embryo tube is too thick, and the heating and penetration are insufficient
Remedy: 1. Increase the temperature or slow down the revolution speed 2. Improve the quality of the embryo tube 3. Reduce the thickness of the embryo tube, or try to increase the outer cover of the heating device to increase the surface temperature of the embryo tube
Fault 3: The position of the bottom nozzle of the PET bottle is offset
Reasons: 1. The blowing time is too early 2. The stretching rod is not down to the end 3. The stretching rod and the center line of the bottle axis are offset 4. The embryo tube wall thickness or injection density is uneven 5. The heating is uneven
Remedy: 1. Delay the blowing time or increase the descending speed of the stretch rod. 2. Adjust the position of the magnetic pole switch. 3. Adjust the position of the stretch rod. 4. Improve the quality of the embryo tube. 5. Improve the heating conditions.
Fault 4: uneven wall thickness of PET bottles
Reasons: 1. The position of the stretch rod is not in the center of the embryo tube 2. The blow hole is asymmetrical and the aperture is not uniform 3. The stretching ratio is too low or the inflation ratio is too small 4. The embryo tube does not rotate in the heating furnace 5. The embryo tube wall Uneven thickness or uneven injection density
Remedy: 1. Adjust the position of the stretch rod 2. Adjust the position and aperture of the blowing hole 3. Increase the stretching ratio or inflation ratio 4. Check the rotation device 5. Improve the quality of the embryo tube
Fault 5: The upper part of the bottle is too thick
Reasons: 1. The upper part temperature is too low 2. The position of the mold vent hole is too far from the upper part 3. The stretching ratio is too low 4. The upper part of the bottle expansion ratio is too low 5. The stretching rod speed is too slow
Remedy: 1. Heat the upper part 2. Adjust the position of the exhaust hole 3. Increase the stretching ratio 4. Change the shape of the bottle 5. Adjust the speed of the stretch rod
Fault 6: The bottom of the bottle is too thin
Reasons: 1. Start blowing too early 2. The bottom temperature is too high 3. The bottom of the embryo tube is too thin
Remedy: 1. Delay the start of blowing time 2. Reduce the bottom temperature 3. Increase the bottom thickness of the embryo tube