The mold has 24 cavities, each one has only 1 gate. I checked preforms made in the older mold and they didnt have this problem, also, we produce other type of preforms and they don´t have this problem. The mold design is supposed to be the same as the old one, but new modl preforms are slightly...
It could certainly be a poor designed core or mechanical failures. This strip is not a parting line, it´s difficult to explain and see, you could imagine it as if 2 flows of material encounter and unite, interrupting the "flowing" aspect of the preform walls when observed under polarized light.
Yes, it is injection molding. Could this kind of problem be related to a defective mold? We started using a new mold and this problem appeared and then progressively became worse. We checked temperatures and pressures, trying new parameters but nothing seems to work. I recently saw that there is...
Greetings, my company produces PET preforms and also blow them, but we have been having some problems related to preform thickness, there is a difference as high as 0.2mm from one side to the other. And, because we use these preforms to make carbonated beverages bottles, once blown and applied...
