Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PA66 burnt three factors

A

Burning treatment investigates item by item according to the three factors of temperature, shear, and venting; most cases are the superposition of the three, and single-item adjustment is often not enough; after confirming effectiveness, fix the parameters and practices into the work instructions...

Injection Molding PA66；burnt；shear；venting；three factors

Q

PA66 glass fiber content selection

A

Glass fiber content is the first variable of PA66 modification; 30-35% is the balance point between rigidity and processability, special structures require case-by-case evaluation; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence

Injection Molding PA66；glass fiber content；30%；bulging；fluidity

Q

PA66 '2079851475616104452 cycle fluctuation

A

PA66 cycle='plasticizing stability': plasticizing time is a leading indicator; stabilize feeding and back pressure, and the cycle can be stable; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; cycle; plasticizing; back pressure

Q

PA66 '2079851475616104452 weld line whitening

A

PA66 white line='cold front': raise temperature, vent, overflow wells; appearance parts need weld lines hidden; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; weld line; whitening; venting

Q

PA66 '2079851475616104452 multi-cavity imbalance

A

PA66 multi-cavity='balance': hardware balance of runners and cooling is fundamental; measure filling balance first before talking about process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; multi-cavity; runner; cooling

Q

PA66 '2079851475616104452 measured melt temperature exceeding standard

A

PA66 melt temperature='setting + shear': measurement is the truth; narrow-window nylon has zero tolerance for over-temperature, actual melt temperature must be monitored; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; melt temperature; shear heat; back pressure

Q

PA66 injection molded product material shortage—venting type

A

PA66 fixed-point material shortage='venting': short shot method locates, open vents at fixed points; if the air trap is not removed, the higher the pressure the more defects; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; material shortage; venting; short shot method

Q

PA66 '2079851475616104452 metering instability

A

PA66 metering='check ring health': high temperature and high pressure accelerate check ring wear; cushion fluctuation is the most intuitive alarm; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; metering; check ring; cushion

Q

PA66 '2079851475616104452 jetting marks

A

PA66 jetting mark='hit the wall at entry': gate direction coordinates with the speed curve; letting the front spread against the wall can eliminate it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; jetting mark; gate; speed

Q

PA66 high melt viscosity and insufficient injection pressure

A

PA66 'use shear thinning characteristics to help filling': increasing speed is smarter than hard-pulling pressure; high-viscosity nylon should make good use of its rheological characteristics, and equipment pressure margin must also be sufficient.

Injection Molding PA66; viscosity; shear thinning; injection pressure; gate

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