No shot full (lack of material)
1. Injection pressure is insufficient; 2.
insufficient-pressure protection; 3. inadequate injection time; 4. feed
(accumulator) is inadequate; 5. radio material staging location is too small;
6. exit end position is too small; 7 injection speed not fast enough; 8 ﹑ tube nozzle
temperature is not enough; 9 mold temperature is not enough; insufficient raw
material drying temperature, time 10; 11 injection molding cycle is too fast,
inadequate warm-up; 12 uneven mixing of raw materials; (backpressure lack of speed
is not enough) 13. lack of liquidity of raw materials; (product too thin wall)
14. Mold venting is inadequate; 15. Die feed uneven; 16. cold well poorly
designed; 17. cold discharge port is too small, direction is unreasonable; 18
mold cavity plastic flow is unreasonable; 19 mold cooling uneven; 20 injection
oil road inaccurate ﹑ not fast enough; 21 electric system instability, imprecise; 22
nozzle leakage of material, there are foreign body stuck; 23. ﹑ screw feed
tube wall wear, poor cooperation;
2. flash (flash)
1. Injection pressure and too much
pressure; 2. insufficient clamping at high pressure; 3. backpressure too; 4.
injection and dwell time is too long; 5 accumulator and cooling time delay is
too long; 6 down too long. Not fired thermal material; 7 injection pressure
dwell too fast; 8 screw speed is too fast, the plastic shear, friction
overheating; 9. casting tube temperature is too high;.. 10 ﹑ cavity mold
temperature is too high uneven cooling; 11 injection stroke debugging
unreasonable; 12 hold pressure switching point, injection end too; 13 mold
assembly combination imprecise; 14 clamping a foreign body, inadequate transfer
mode position; 15. Clamping not ﹑ precise parallel; 16 inadequate lubrication thimble ﹑
maintenance; 17. Slider ﹑ angle pin press-fitted in place; 18 cavity inserts not press into
place, stays out of the mold surface; 19 inlet design reasonable uneven
distribution ; 20 product design lead to somewhere at the end of the inner wall
is too thin and too far; 21 unreasonably small inserts combinations,
deformation prone; 22 inserts for wear due to production ﹑ ﹑ deformation fillet;
23 inserts No design stability ﹑ not hold together, reinforcement; 24. exhaust groove deep cavity;
3. bubbles (gas sores)
1. Paul insufficient pressure injection ﹑ pressure;
2. ﹑ raw material solid enough back pressure is too small; 3. injection
speed too fast; 4. Storing too fast; 5. tube temperature is too high, mold
temperature is too low; 6. material drying temperature, time shortage; 7 shot
back too much; 8. The injection cycle is too long; (warm-up time increases) is
less than 9. feeding position, injection end is too small; 10. Front ﹑ retracted
position after the song is too long; 11. The machine hydraulic instability; 12.
tube ﹑ screw compression ratio is not enough; 13 under ﹑ uneven
mixing raw materials; 14. tube reflux, are dead; 15 die inlet is too small ﹑ mold cavity
flow not fast enough; 16. cold material improper well design, cold material
into the mold cavity; 17 improper cooling mold, mold core temperature is too high;
the inner wall 18. The design is too thick, uneven internal stress; improper
feed additives 19, easy. Decomposition precipitation;
The crazing (rhyolitic)
1. Injection pressure is too small; 2.
dwell too much pressure; 3 back pressure too; 4. injection speed is too slow,
too fast packing; 5 ﹑ mold temperature material temperature is not high enough; 6
injection ﹑ dwell too long; 7 injection stroke debugging improper ﹑ hold
pressure switching points too; 8 ﹑ drying materials is not too much water; 9. poor material flow, the
viscosity is too high; 10 injection molding machine is not fast enough ﹑ precision;
11 die inlet is too big or too small; 12 ﹑ secondary runner
sprue size is not big enough; 13 the flow direction of the mold cavity is
unreasonable; 14. ﹑ mold surface irregularities with oil;
5. Pack the wind (burns. Coke)
1. Injection pressure ﹑ too fast;
2. backpressure too; 3. screw feeder too fast; 4 cylinder temperature is too
high; 5 cycle time is too long or too fast; 6. Front ﹑ song
retracted position too; 7 materials is not drying; 8. feedstock good liquidity,
too much time feeding than or dust; 9. additive unstable, decompose
precipitation; 10 mold venting groove deep enough ﹑ wide
follow-up row gas shortage; 11 runner ﹑ feed uneven; 12 die
with tight clamping force is too large; 13 die dirty vents blocked by oil ﹑ halogen
scale; 14 mold design and processing methods are not reasonable overall cavity
too; 15 injection molding machine ﹑ precision
temperature control is not stable; 16. tube countercurrent or dead inside; 17
nozzle leakage of material and filling the mouth with insufficient; 18. screw
head (split spindle) is not Reasonable or broken; 19 inlet is too small, the
flow of complex mold cavity;
6. brittle plastic body
1. Paul insufficient injection pressure; 2.
﹑ raw material solid enough back pressure is too small; 3. the back
pressure is too large, cut ﹑ friction heat rises; 4. firing rate is too slow, not fully
crystallized; 5. mold temperature is too high, Decomposition ﹑ ﹑ raw excesses
deterioration; 6. The mold temperature is too low, not fully crystallized; 7.
Paul insufficient pressure injection ﹑ time; 8. downtime
and cycle time is too long; 9 material storage time is too long; 10. The second
charge was added too much or too much dust; 11. ﹑ raw strength and
toughness is not enough, not enough viscosity; 12. additives unreasonable, or
add too much; 13 materials is not fully dried; uneven mold cavity 14. The
structure of the junction too far ; 15 Die feed uneven, cold material well enough;
16. The inner wall is too thin product design, no radiation help strengthen; 17
injection molding machine ﹑ precision temperature instability; 18. tube countercurrent or dead
inside; 19 The top of the unreasonable, plastic body stress increases, resulting
in rupture; 20 improper handling post-cooling plastic body, easy to crack
more information www.cnmoulding.com www.chinamoldmaker.org
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