Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PET moisture absorption storage management

A

PET raw material management must account for moisture absorption; exposure time recording plus graded drying brings the storage variable into process control; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PET；storage；moisture absorption；re-moistening；graded management

Q

PET vented extrusion drying-free

A

PET vented extrusion is a double-insurance mode of drying plus venting; skipping drying and relying only on venting, the deep-layer moisture will inevitably collect its debt in the form of bubbles; after confirming effectiveness, solidify the parameters and practices into the work instruction to ...

Material Drying PET；vented extrusion；drying-free；50ppm；double insurance

Q

PET mold temperature 70-80℃

A

PET mold temperature is managed in stages; high temperature in injection ensures crystallization and low temperature in cooling ensures the cycle, and the two-stage combination is the standard practice for engineering parts; after confirming effectiveness, solidify the parameters and practices in...

Injection Molding PET；mold temperature；70-80℃；crystallization；staged

Q

PET melt temperature 280℃ upper limit

A

280℃ is the thermal decomposition red line of PET melt; dual management of temperature and residence time is the basic skill for preventing discoloration and degradation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Analysis PET；melt temperature；280℃；thermal decomposition；discoloration

Q

PET crystallization for anti-sticking

A

Crystallization is the pre-process of PET drying; drying amorphous material without crystallization will inevitably cause lumping and tower blockage, which is an introductory lesson in recycled PET processing; after confirming effectiveness, solidify the parameters and practices into the work ins...

Material Drying PET；crystallization；anti-sticking；amorphous；149℃

Q

PET moisture deep inside the pellets

A

PET's deep-layer moisture determines the high threshold of the drying process; dew point and time are two hard indicators that cannot be compressed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PET；deep-layer moisture；molecular bonding；dew point；-40℃

Q

PET injection-grade drying 0.02%

A

PET injection-grade drying can be quickly checked on site with the air-shot method; the 0.02% red line plus air-shot verification is a practical standard executable in the workshop; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PET；injection drying；0.02%；air-shot method；discoloration

Q

PET over-drying oxidation

A

PET drying is range control, not the longer the better; both hydrolytic degradation and oxidative degradation must be guarded against, and yellowing is the alarm of over-drying; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PET；over-drying；oxidative degradation；yellowing；AA

Q

PET bottle-grade drying 165-175℃

A

Bottle-grade PET drying parameters are a precise combination: the four elements of temperature, time, dew point, and air volume are all indispensable, and AA and IV are the verification indicators; after confirming effectiveness, solidify the parameters and practices into the work instruction to ...

Material Drying PET；bottle-grade drying；165-175℃；AA；acetaldehyde

Q

PET drying 100 ppm and IV loss

A

PET drying quality is quantified by IV loss; the dual indicators of 100 ppm plus 0.04 dL/g are the industry benchmark for recycled PET quality control; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PET；100ppm；IV loss；0.04dL/g；recycling

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