The technology noting model of PA66 is analysed

One, of nylon PA66 as dry as a chip
Vacuum is as dry as a chip: Hour of 6-8 of hour of temperature ℃ 95-105

Sirocco is as dry as a chip: Hour of temperature ℃ 90-100 is controlled 4 hours.

Crystallization sex: Outside dividing brightly lit nylon, nylon is crystallization high polymer mostly, crystallization is spent tall, a function such as finished product tensile strength, wearability, hardness, lubricity rise somewhat, hot coefficient of expansion and water imbibition tend reduce, but to connecting lightness and fight concussion function somewhat unlucky. Mould temperature is bigger to crystallization influence, lukewarm tall crystallization spends the model tall, lukewarm low crystallization spends the model low

Shorten rate: Plastic and as similar as other crystallization, nylon colophony existence shortens the question with bigger rate, normally of nylon shorten contact with crystallization the biggest, when finished product crystallization is spent big when finished product shortens also can increase, in shape mould temperature \ is reduced to increase in the process give or take an injection pressure \ is reduced expect lukewarm metropolis is reduced shorten, but finished product internal stress increases changeful form.PA66 to shorten rate 1.5-2%

Shape equipment: When nylon shapes, principal and advertent avoid " of nozzle stream delay picture " , because the treatment of makings of this pair of nylon is chosen normally,lock up type nozzle oneself.

2, finished product and mould
1, of the mural thick nylon of finished product flow long than be 150-200 between, the finished product wall of nylon is large not the bottom chooses between 1-3.2mm normally at 0.8mm, and of finished product shorten the wall with finished product is large about, the wall is large thicker shorten bigger.

2, excessive edge is worth exhaust nylon resinous to be controlled for 0.03mm, so steam vent chamfer should be held accuse to be in 0.025 the following.

3, mould temperature: Finished product wall is thin difficult shape or request crystallization to spend tall mould to add Wen Cao to accuse, request to taste those who have sure flexibility to choose cold water to accuse normally lukewarm.

3, of nylon shape technology

Makings canister temperature
Because nylon is crystallization polymer, so melting point is being shown, nylon kind the appearance element of the function that colophony expects in what when noting model, choose canister temperature is the same as colophony itself, equipment, finished product is concerned. Nylon 66 for 260 ℃ . Because the thermal stability of nylon is poorer, so unfavorable high temperature grows hour to linger in makings canister, avoid to bring about stock to become angry hair is yellow, one cause is better for the mobile sex of nylon, after temperature surpasses its melting point with respect to the activity rapid.
Give or take an injection pressure
The viscosity of nylon fuse-element is low, mobile sex is good, but condensation rate is rapidder, in appearance mixed and disorderly with the wall thick on thinner finished product easy present devoid question, reason still is demand is higher give or take an injection pressure.

Pressure is normally exorbitant, finished product can present excessive edge question; Pressure is too low, finished product can produce the defect such as the moire, bleb, frit knot trace that showing or finished product lack, most nylon gives or take an injection phyleticly pressure does not surmount 120MPA, choose the request that is contented major finished product inside 60-100MPA limits normally, need finished product not to present the defect such as bleb, dent only, do not expect to choose higher dwell pressure normally, avoid to form finished product internal stress to add. Give or take an injection speed is right nylon, the speed that note model with fast advisable, because cooling rate passes,can avoid fast and those who form is moire, fill a model to lack doubt. Give or take an injection quickly career is not excellent to the functional influence of finished product.
Mould temperature
Mould temperature is spent to crystallization reach shape shorten rate have sure effect, high standard lukewarm crystallization spends quantity of tall, wearability, hardness, stretch model to add, water imbibition is reduced, of finished product shape shorten rate add; Low standard lukewarm crystallization spends low, tenacity good, percentage elongation is taller.





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