In our injection molding processing molding plastic products in order to enhance the PA6 and PA66 injection molded products of manufactured goods superior quality and high efficiency, the following side to share with you about PA6 and PA66 injection molding processed products of manufactured goods product qualification rate molding of the twelve common problems.
1, injection temperature and dry temperature need to be high; injection pressure and test pressure does not have to be too high and too long, should be used to quickly injected into the male mold, there should be an exhaust pipe safety channel, in order to prevent the plastic particles burnt paste; back pressure 50 ~ 150kg/cm2 pressure 150KG per cubic centimeter should be equivalent to the back pressure of 15MPA.
2, when the plastic is not done in the dry level certainly can not be put into the molten plastic barrel, because of the water content and more cases to facilitate the jamming in the feeding section of the screw groove, where we usually talk about is to lead to the agglomeration, resulting in difficult feeding conditions.
3, in the injection molding process, in the injection nozzle at the most very easy refrigeration, if in the cooling down to expand the actual operation of the injection pressure, easy to lead to the check valve cracking, so the injection nozzle at the temperature manipulation must be moderate. In order to avoid plastic overflow into the mold due to feeding, it is advisable to use the temperature of the injection nozzle with partition planning.
4, in exchange for other plastics to carry out injection, should pay attention to the original PA plastic raw material heating temperature is 270 ℃ or more, here is the temperature of PA66, and PA6 general material heating temperature is only 240 ℃ or less can be run, and thus the need to heat wear-resistant material tube to the heating temperature and then run again, or else prone to make the screw check valve and the rocket head fracture.
5, pay special attention to the molding method can cause significant achievements.
6, in order to avoid molding burrs, must apply high precision mold.
7, the application of industrial products mold, temperature rise, pay special attention to the crystallization of raw materials molding.
8,Plastic design products need to avoid dents, taking into account the reliability of the specifications.
9, molding shrinkage rate of about 1.5 ~ 2.5% up and down.
10, polyester 6 (PA6) heating temperature of 220 ~ 280 ° C; mold temperature 100 ~ 160 ° C; material pipe temperature 200 ~ 260 ° C; spray out material temperature 220 ~ 300 ° C is also the temperature of the injection nozzle; injection pressure 700 ~ 1700kg / cm2 pressure 1700KG per cubic centimeter should be equivalent to 170MPA; the minimum actual operating temperature of 225 ° C; melting point Temperature 215℃; Drying temperature is 85~100℃, it takes 2~6 hours; Apply dehumidifying dryer; Injection pressure 750~2000kg/cm2; Material tube temperature is 240℃ for the first section, 250℃ for the second section, 250℃ for the third section, 230℃ for the fourth section; Mold surface temperature 25~70℃; Thermal expansion coefficient 0.000083/℃; Molding shrinkage rate 0.6~2.1%; ratio 1.1~1.4; thermal deformation temperature 67~70℃.
Polyester 66 (PA66) heating temperature of 250 ~ 330 ℃, mold temperature of 60 ~ 100 ℃, the material pipe temperature 240 ~ 300 ℃, sprayed out of the material temperature of 250 ~ 310 ℃, which is the temperature of the injection nozzle, injection pressure of 600 ~ 1800kg / cm2 pressure of 1800 KG per cubic centimeter should be equivalent to 180 MPA; the minimum actual operating temperature of 260 ℃; melting point temperature 225 ℃; molding temperature 260 ~ 320 ℃; dry agitation temperature of 80 ~ 110 ℃, it takes 3 ~ 6 bells; the application of dehumidification dryer; coefficient of thermal expansion of 0.000083 ~ 0.00013 / ℃; molding shrinkage rate of 1.3 ~ 2.4%; ratio of 1.1 ~ 1.4; thermal deformation temperature of 66 ~ 86 ℃.
11,Temperature setting: nozzle 235~285℃; one section 235~275℃; two sections 230~270℃; three sections 220~250℃; screw speed ratio 60~80rpm; mold temperature 55~70℃; back pressure type 5~10kg.
12, relative density 0.94~1.14g/cc, deformation temperature 35~121℃, molding shrinkage 0.7~2.5%.
