Common problems in the process of making PET plastic blow molded bottles

Plastic products occupy a 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 seems to be very simple, in fact, its production process is very exquisite, especially in the process of making PET plastic blow molded bottles, there may be various problems. The following Xiaobian will give you an analysis of the common problems in the production of PET plastic packaging containers:

 

The first obvious problem is local whitening: the cause of the problem is: overstretch, the temperature is too low, or the preblow too early, or the stretch rod is hit.

 

The second problem that can occur is that the whole bottle looks cloudy and less transparent. The reason is: not enough cooling.

 

The third problem is that the bottom of the bottle has wrinkles inside. 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 is too small.

 

The fourth problem is the center deflection under the bottle of PET plastic packaging container, which is related to the billet temperature, stretching, preblowing, high pressure blowing and so on. The solution is to first reduce the temperature of the billet, but also to speed up the tensile speed, check the gap between the rod head and the bottom die, delay the preblowing, reduce the preblowing pressure, After the high pressure blowing treatment is delayed, check whether the center deflection of the bottle blank will still occur.

 

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

 

The sixth problem is that the bottom of the bottle is white, because the billet is too cold, but also overstretched, pre-blown too early or pre-blown too high pressure.

 

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

 

The eighth problem is thick at the top and thin at the bottom. Need to delay the pre-blowing time, or reduce the pre-blowing pressure to reduce gas flow.

 

The ninth problem is thin at the top and thick at the bottom, which is the opposite of the solution to the problem.

 

The above is a small series of common problems in the process of making PET plastic blow bottle analysis, plastic packaging container types, shapes and other sexual characteristics are relatively rich, so in the production of different plastic containers, people will take different types to carry out, in the process of production is also very careful, careful.