Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PET drying 0.005% red line

A

The moisture red line for PET sheet is at the 50 ppm level rather than the percent level; hydrolytic viscosity reduction is irreversible, and drying is the first lifeline of sheet quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent r...

Material Drying PET；drying；0.005%；50ppm；hydrolysis；IV

Q

PET workshop dust contaminating preforms

A

Food-grade preforms have high cleanliness requirements; enclosure and clean workshop management are the common guarantee for hygiene and appearance quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PET；preform；dust；cleanliness；hygiene；conveying

Q

PET preform melt fracture

A

PET preform melt fracture is mostly seen in high-speed filling; coordinated adjustment of the three parameters of temperature, gate, and speed can eliminate the texture while ensuring the cycle.; after confirming effectiveness, solidify the parameters and practices into the work instruction to pr...

Molds & Tooling PET；preform；melt fracture；sharkskin；shear；gate

Q

PET bottle shoulder stretching thin and rupture

A

Shoulder stretching thin is the result of mismatch between temperature and stretch design; concentration at an orientation indicates local heating or mold factors, which should be investigated in a targeted manner.; after confirming effectiveness, solidify the parameters and practices into the wo...

Extrusion & Post PET；bottle shoulder；stretching thin；rupture；stretch ratio；heating

Q

PET bottle bottom material accumulation too thick

A

Bottle bottom material accumulation is a manifestation of material distribution imbalance; stretching depth and blowing timing are the main adjustment means, and an overly thick bottom instead becomes the starting point of brittle cracking.; after confirming effectiveness, solidify the parameters...

Extrusion & Post PET；bottle bottom；material accumulation；thickness；stretching；distribution

Q

PET preform hot runner crystallization blockage

A

Hot runner blockage is the cumulative result of long-term temperature control imbalance; standardizing shutdown and startup procedures and regular maintenance can significantly reduce the blockage frequency.; after confirming effectiveness, solidify the parameters and practices into the work inst...

Molds & Tooling PET；hot runner；blockage；crystallization；gate；maintenance

Q

Poor PET colorant dispersion

A

Coloring quality depends on the dispersibility of the color masterbatch and the stability of metering; optical appearance products should use special color masterbatch and establish color difference control standards.; after confirming effectiveness, solidify the parameters and practices into the...

Processing Machinery PET；coloring；color masterbatch；dispersion；color difference

Q

Improper PET raw material IV grade selection

A

IV grade selection is the first step in preform design; balancing application, performance, and processability, incoming material IV testing is a basic quality checkpoint.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Analysis PET；IV；grade；selection；carbonated bottle；pressure resistance

Q

PET oligomer precipitation contamination

A

Oligomer precipitation is a defect mainly of raw material factors; material selection and control of thermal history are the fundamental cure, while mold wiping can only treat the symptoms.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent...

Molds & Tooling PET；oligomer；precipitation；mold；contamination

Q

PET bottle high haze exceeding standard

A

Haze is the quantitative indicator for transparent PET products; establishing linkage between per-batch haze testing and process records can quickly locate the root cause of exceeding the standard.; after confirming effectiveness, solidify the parameters and practices into the work instruction to...

Material Drying PET；bottle；haze；transparency；crystallization；testing

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