Common problems in the process of making plastic blow molding bottles

Plastic products occupy a relatively large proportion in our lives, especially those large and small plastic packaging containers, which are closely related to our daily life. Although this kind of container looks simple, its production The craftsmanship is very particular, especially in the process of making pet plastic blow-molded bottles, various problems may arise, the following editor will analyze the problems that will occur when making pet plastic packaging containers:

First of all, an obvious problem is local whitening: the cause of the cover problem is: the temperature here is too low, or the pre-blowing is too early, or it touches the stretch rod.

The second problem that may arise is that the whole bottle looks cloudy and less transparent, the reason is: insufficient cooling.

The third problem is that there are wrinkles in the bottom of the bottle. The reasons are: the temperature at the bottom is too high, the cooling at the gate is not good, the pre-blowing is too late, the pre-blowing pressure is too low, and the flow rate is too small.

The fourth problem is that the center of the bottle bottom of the pet plastic packaging ring is skewed. This is related to the temperature of the preform, stretching, pre-blowing, high-pressure blowing, etc. The solution is to lower the bottle first. At the same time, it is necessary to speed up the stretching speed, check the gap between the tie rod head and the bottom film, delay the pre-blowing, and take effect of the pre-blowing pressure, and then check whether the center of the preform will still appear after the high-pressure blowing process is completed. Skewed case.

The fifth problem is the magnifying glass phenomenon at the bottom of the bottle. The reasons are: too much material at the bottom of the bottle, too late pre-blowing, and too low pre-blowing pressure.

The sixth problem is the white bottom of the bottle. The reason is that the preform is too cold and stretched too much, the pre-blowing time is too early or the pre-blowing pressure is too high.

The seventh problem is that there will be wrinkles under the bottleneck, the pre-blowing is too late or the pre-blowing pressure is too low, or the embryo cooling here is not good.