Maintenance of common faults of blow molding machine 1-6.

September 23, 2021

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 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 is offset from the center line of the bottle axis; 4. The embryo tube wall thickness is uneven or the injection density is uneven; 5. Heating 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 or check the embryo tube Is there a problem with rotation?

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 holes are asymmetrical and the hole diameter is different; 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. , Uneven embryonic tube wall thickness or uneven injection density;

Elimination methods: 1. Adjust the position of the stretch rod; 2. Adjust the position and diameter 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 temperature of the upper part 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 inflation ratio of the upper part of the bottle is too low; 5. The stretching rod speed is too slow;

Remedy: 1. Heat the upper part; 2. Adjust the position of the vent; 3. Increase the stretching ratio; 4. Change the shape of the bottle; 5. Adjust the speed of the stretching rod.

Fault 6: The bottom of the bottle is too thin

Reasons: 1. The blowing time is 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. Decrease the bottom temperature; 3. Increase the bottom thickness of the embryo tube.

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