At present, high-end bottles on the market are generally blown by two-step method. The two-step method is also called injection-stretch-blow, which means that the preform is first injected and then blown into a bottle. Because the preform is used to process the blown bottle, the quality of the preform is very important. “A good cook cannot cook without rice.” Without good rice, it is certainly not easy to make good rice. Similarly, it is difficult to blow a good bottle with a bad preform. Usually, several problems are prone to occur during the bottle blowing process. The bottle is blown, the bottom is aggregated, the bottom is not straight, the bottle body is thin, the bottle is white, etc. How to distinguish whether it is a problem with the blowing or the preform?
- Reasons for bottle blow-out:
- The embryo tube is not heated enough and is not baked thoroughly;
- The stretching rod is not pulled in place (to the bottom);
- The stretching rod speed is too slow;
- The temperature protection is turned on but the upper and lower temperature limits are set too high.
Solution:
- Increase the voltage when the output remains unchanged. Reduce the output when the voltage remains unchanged, that is, extend the time of the second blow.
- Exhaust after mold closing, push the stretching rod to the bottom of the mold and contact the bottom of the mold by hand, and tighten the limit nut. (Only limited to mechanical limit cylinder adjustment).
- Adjust the throttle valve on the stretching cylinder to the maximum.
- Lower the lower limit temperature. Generally, the PET embryo is set to 85~95 degrees, and the upper limit can be set to 125~130 degrees.
- Bottom aggregation, that is, there is a thick material gathered at the bottom:
- Generally, the delayed blowing time is too long, or the one-time blowing time is too long;
- The bottom of the embryo is not baked soft, and the temperature difference with other positions is large.
Solution:
- Reduce the time of delayed blowing, generally about 0.3 seconds, which can be increased or decreased according to the bottle situation.
- Pinch the embryo tube with your hand to see if the bottom is still hard. If so, increase the voltage of the corresponding bottom lamp.
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Taizhou Hualong Imp&Export Co.,Ltd. which is cooperation with us for many years, it is a Global freight import and export agent company which profoessional service on different factories in China, the mainly business is receiving payment and doing the custom clearance, sometime assist for us import some parts from other countries.
Why we choose Taizhou Hualong Imp&Export Co.,Ltd.?
1, Opertional simply
2, Charge much lower, because they can service many factories and do it at the same time.