Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

Improper winding tension / poor winding

A

This problem is a typical manifestation of improper winding tension / poor winding in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to star...

Extrusion & Post winding tensiontaper controlroll diameter compensationtension PIDpoor winding

Q

Film skewing / deviation

A

This problem is a typical manifestation of film skewing / deviation in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to start troubleshooti...

Extrusion & Post winding tensiontaper controlroll diameter compensationspeed synchronizationtension setting

Q

Excessive plastication / scorch

A

The essence of excessive plastication (scorch) is thermo-oxidative degradation of material at high temperature. The core of the solution is similar to extrusion degradation — "three controls": control banburying and roll temperature not to exceed limits, shorten material residence time in high-te...

Extrusion & Post excessive plastication scorchbanburying temperatureroll temperature too highheat stabilizerresidence time

Q

Poor plastication

A

The essence of poor plastication is insufficient temperature or inadequate mixing time preventing the resin from fully melting. The core of the solution is "heat up + extend time + adjust formulation": increase feed temperature and banburying time, select resin powder with smaller particle size t...

Extrusion & Post poor plasticationfeed temperaturemixing timeplasticizer dosageresin particle size

Q

Color difference / discoloration

A

This problem is a typical manifestation of color difference / discoloration in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to start troub...

Extrusion & Post spinning color differencemasterbatch meteringtemperature fluctuationchip batchcolorant stability

Q

Uneven shrinkage rate

A

This problem is a typical manifestation of uneven shrinkage rate in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to start troubleshooting ...

Extrusion & Post uneven shrinkage ratespeed ratio orientationcooling uniformityheat setting temperatureincoming material shrinkage rate

Q

Poor cooling and setting

A

This problem is a typical manifestation of poor cooling and setting in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to start troubleshooti...

Extrusion & Post poor cooling and settingcooling roll temperaturecalendering speedcooling medium flowscale cleaning

Q

Calendering wrinkles

A

The essence of wrinkles is inconsistent speeds of various parts of the film surface passing through the roll nip or asymmetric tension distribution. The core of the solution is to ensure uniform roll gap and stable tension control — adjust the roll gap to eliminate local speed differences and opt...

Extrusion & Post winding tensiontaper controlroll diameter compensationspeed synchronizationtension setting

Q

Roll surface wear / damage

A

This problem is a typical manifestation of roll surface wear / damage in calender molding. The core of the solution lies in precise adjustment of roll gap compensation, uniform control of roll temperature distribution, and assurance of feed system stability. It is recommended to start troubleshoo...

Extrusion & Post roll surface wearhard impuritiesnatural wearroll surface protectionmetal detection

Q

Roll sticking / roll wrapping

A

The essence of roll sticking is that the adhesion force between melt and roll surface exceeds the separation force required for normal stripping. The solution approach is "cool down + adjust angle + add additives": reduce that roll's temperature to reduce adhesion force, adjust the stripping angl...

Extrusion & Post roll sticking and wrappingroll temperature too highstripping anglelubricantroll surface coating

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