Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PET mold temperature out of control causing crystallization

A

Mold temperature is the key parameter for PET preform crystallization resistance; the maintenance of the cooling system and the stability of temperature control directly determine the batch consistency of preform transparency.; after confirming effectiveness, solidify the parameters and practices...

Molds & Tooling PET；preform；mold temperature；crystallization；cooling water channel；white haze

Q

PET melt temperature too high causing degradation

A

PET thermal degradation simultaneously produces the triple hazards of yellowing, AA increase, and IV decline; regularly measuring the actual melt temperature rather than only looking at the display is a basic requirement of temperature control management.; after confirming effectiveness, solidify...

Molds & Tooling PET；melt temperature；degradation；yellowing；shear heat

Q

Improper PET drying process

A

PET drying must use dehumidification rather than ordinary hot air; the three elements of dew point, temperature, and time are indispensable, and preventing secondary moisture absorption after drying is equally critical.; after confirming effectiveness, solidify the parameters and practices into t...

Material Drying PET；drying；dehumidification；dew point；moisture content；moisture absorption

Q

PET bottle drop pinhole leakage

A

Pinholes originate from defects inside the preform being magnified by stretching; drying and impurity removal are the fundamental prevention, and the leak detection process is indispensable for pressurized products such as carbonated beverages.; after confirming effectiveness, solidify the parame...

Extrusion & Post PET；bottle；pinhole；leakage；bubbles；stretching

Q

PET bottle stress cracking

A

Stress cracking is strongly related to molecular weight and residual stress; controlling IV retention and uniform stretching is fundamental, and special grades need to be selected and verified for applications in contact with chemicals.; after confirming effectiveness, solidify the parameters and...

Extrusion & Post PET；bottle；stress cracking；IV；residual stress；environment

Q

Poor label adhesion on PET bottles

A

Label problems mostly originate from the bottle surface condition rather than the labeling machine; keeping the bottle surface clean and dry and eliminating surface defects are the prerequisites for improving the label adhesion pass rate.; after confirming effectiveness, solidify the parameters a...

Molds & Tooling PET；bottle；label；adhesion；surface；labeling

Q

PET bottle seal leakage

A

Sealing performance is already determined in the preform injection stage; control of bottle finish dimensions and white spots is the key to leak prevention, and sampling inspection of cap-on sealing should be performed before filling.; after confirming effectiveness, solidify the parameters and p...

Injection Molding PET；bottle；leakage；sealing；bottle finish；dimensions

Q

PET bottled water taste change

A

Water taste change can almost be pinned down as the AA migration problem; mineral water is most sensitive to AA, which must be controlled from both ends of incoming-material AA and processing temperature, with sensory and headspace testing performed before leaving the factory.

Material Analysis PET；bottled water；taste change；acetaldehyde；migration；drinking water

Q

Burnt odor in PET bottles after blowing

A

Burnt odor is a signal of thermal degradation or contamination and is a flavor safety defect; control temperature, purify the air, and select good material in a three-pronged approach, and batches with odor should be isolated for evaluation.

Material Analysis PET；bottle blowing；burnt odor；odor；thermal degradation；air source

Q

PET bottles too soft with insufficient strength

A

A bottle being too soft requires distinguishing a design problem from a process problem; low-temperature molding to increase orientation is an effective means of improving rigidity, but the whitening risk must be taken into account for comprehensive balance.; after confirming effectiveness, solid...

Extrusion & Post PET；bottle blowing；too soft；rigidity；orientation；bottle design

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