Causes and solutions of injection molding defects

Incorrect operating conditions damage the machine and mold will produce a lot of molding shortcomings, in order to reduce the downtime, and to find out the reason for the operation of the problem as soon as possible, the operator should put all the best injection molding machine conditions recorded in the “injection molding conditions record table” for future reference when solving the problem.

(1) the finished product is not complete, the plastic temperature is too low, the temperature of the melt cartridge is too low, the injection pressure is too low, the injection pressure is too low, the amount of injection is not enough, and the amount of injection is not enough. Plastic spill to readjust its shot before the time is too short to increase shot shot rubber adhesive time too slow speed shoot rubber low-pressure improper adjustment to adjust the mold temperature is too low to improve mold temperature reset the mold temperature unevenness of mold pipe mold venting is not good proper location and moderate vent nozzle temperature is not low average increasing nozzle temperature into the glue not reopen mold runner or overflow mouth overflow mouth position is too small increase runner or overflow mouth plastic lubricant is not enough to increase slightly increasing back pressure lubricant back pressure is insufficient Over the rubber ring, melt plastic screw wear removal inspection repair injection amount is insufficient replacement of large size injection molding machine products too thin use nitrogen injection

(2) the products shrink, the amount of glue in the mold is insufficient, the amount of glue is insufficient, the amount of glue is insufficient, the injection pressure is too low, the back pressure is not high enough, the injection time is too short, the injection speed is too slow, the injection speed is too fast, the overflow of the mold is too small or the position of the injection nozzle is too fine, the plastics solidify in the runner bushing, reducing the effect of back pressure. If the injection nozzle temperature is too high or the mold temperature is too low, the mold temperature should not be adjusted properly. If the cooling time is not enough, the cooling time is not enough

If the amount of injection is too large, replace the thin injection molding machine with the rubber ring; if the melting screw is worn, remove and repair the gate is too small; if the plastic solidifies and loses support, the back pressure will increase the gate size

(3) finished product sticky mold, packing shot too full to reduce pressure, time, speed and resin shoot shoot rubber pressure is too high to reduce shoot rubber resin pressure shot too much of glue quantity decreased shoot shoot rubber too long decrease shoot rubber between the temperature when the temperature is too high to reduce material uneven feed of the part too full overflow mouth size or location change mold temperature too high or too low to adjust mould temperature and relative humidity on both sides mould with demoulding chamfer mould removed chamfer mould repaired surface is not smooth polished mould stripping vacuum mould or a slow, Or mold and air intake equipment injection cycle is too short to strengthen the cooling demulsifier slightly increase the amount of demulsifier

(4) the sprue (nozzle) sticky mold, shoot rubber pressure is too high to reduce shoot rubber plastic temperature is too high to reduce plastic sprue is too large to modify mold runner not prolong cooling or decrease the temperature of cooling sprue ejection Angle is not modify mould increase point of sprue bushing with nozzle is not straight to readjust its inner surface not only cooperate with the sprue or ejection chamfer repair mold sprue hole is damage repair mold not grasp adding pin sprue pin packing too full reduce resin content, insufficient time and speed tuomoji slightly increase the stripping agent

(5) feather, flash, plastic temperature is too high to reduce plastic temperature, the lower mold temperature shoot shoot high speed slows the shoot rubber adhesive pressure is too high to reduce shoot rubber packing is too full to reduce adhesive time, speed and dose moulding line or anastomosis face bad repair mold clamping pressure increase enough clamping pressure or replace die large injection molding machine

youngstrong
Dongguan Taiwang Machinery Co.,LTD
Add:NO.127,longyan road,Chongkou Industrial district,Dongguan city,China.
Wedsite:www.twmachines.com
Mobile:86-13829239482
Tel:86-769-81701081
Email:[email protected]