Material type |
Main application |
Materialrequirement characteristics
|
Glass fiberreinforced PP |
motorcycle trunk |
All materials areconsigned to Pusheng Testing Co., Ltd. to be tested, which meet therequirements of the automobile and home appliances.
|
PP+EPDM-T20 |
Seamless safety airbag instrument panel |
|
PP+EPDM-T20 |
Seamless safety airbag instrument panel |
|
KT8804 |
Pedal support
|
|
PB10 |
Bumper
|
|
PZ06 |
Bumper bracket
|
|
PB11 |
Bumper
|
|
PPY Series |
Car dashboard, doortrim panel, column, tool box cover, side panel, sill, steering post etc. |
|
PPB Series |
Car bumper |
|
PP+EPDM-T20 |
Mini car dashboard,column, door
|
|
PP-T20 |
Mini car column, dooretc
|
|
PB51 |
Mini car bumper
|
|
PP-LZ |
Mini car wheel casing
|
|
GPB10201 |
Mini car apronboard
|
|
FCTN |
Mini car scuff
|
|
PP-T40 |
Commercial vehicle foglamp hole cover, upper mounting plate |
|
PY5 |
Truck dashboard, door,glove box etc
|
|
PY48 |
Truck bumper,grill, fender etc
|
|
PPF Series |
Light truck dashboard, dooret |
|
PP-X Series |
Light truck bumper |
|
PP-K Series |
Automobile air filter |
|
The long glass fiberreinforced PP |
All kinds of militarypacking box and other special container products, bumper bracket, instrument panel frame and so on can meet thelarge-scale terminal users requirements. |
Plus the highhardness, light weight, anti-corrosion, low cost and excellent workability canadapt to products with various complicated structures, making it become the optimalchoice of the substitute metal.
|
Product uses: Usedin plastic part material for vehicle, such as the automotive interior andexterior parts. Application area: Apply in automotive parts. Key technology:According to the technical requirements of the auto plastic parts, we choosethe co polypropylene and add certain amount of fine talc powder with activatingtreatment. Owing to its layered structure and good nucleation property, it endowshigh hardness and strength to the products and improves the thermal deformationtemperature and dimensional stability, and also greatly improves the bendingstrength and flexural modulus. In order to improve the product performance inimpact-resistance and resistance to cracking, we choose ethylene-vinyl acetatecopolymer and thermoplastic elastomer to produce the PP modified plastics withexcellent performance indexes by high-speed kneading blend and double screwextrusion granulation. The technical parameters:
Test items |
Test results |
Tensile strength,sample size: type 1A
Test speed：50mm/min |
21 |
Izod impactstrength (notched) kJ/㎡sample size：（80×10×4）mm Pendulum size：3.46V-2.75J Notch type: TypeA
|
20.5 |
Bending strength MPa sample size：（80×10×4）mm Test speed：2mm/min |
25.9 |
Flexural modulus MPa sample size：（80×10×4）mm Test speed：2mm/min |
1610 |
Load deformationtemperature, ℃ sample size：（80×10×4）mm Load：0.45 |
102 |
Flow rate of meltquality g/10min Load：2.16kg Temperature：230℃ |
18 |
Injection molding analysis |
|||
Process and equipment |
mold |
material |
|
Weld line |
1. Injection pressure(speed) is too low or too high 2. Backpressure setting is inappropriate 3. Feed-pipe temperature is too low |
1. Mold temperature is too low 2. Gate orrunner is too small; the sprue runner is too long 3. Bad exhaust |
1.Liquidity is notgood 2. There exists foreign substance in materials |
Craze |
1. Barrel temperatureis too high 2. Screw speed is too fast 3. Nozzle is too small, too hot orobstructed 4. Glue quantity exceeds 80% of the machine volume 5. There’s gas orwater vapor in the melt adhesives 6. Pure anticipate is not thorough |
1. Gate is too small 2. Gate or runner is obstructed 3. There are minor cracks on the mold surface |
1. Material is notfully dry 2. Material contains foreign body 3. Material is decomposed underhigh temperature |
Flashing |
1.Injection pressure(speed) is too high 2. Melt adhesives stay in feed-pipe too long 3. Moldingcycle is too long 4. Lock die is insufficient 5. Material temperature is toohigh |
1. Poor contact ofthe joint face 2. Mold strength is not enough 3. Bad exhaust 4. sprue runner istoo long |
1. Fluidity is toogood 2. Too much lubricant |
Sink |
1. Barrel or moldtemperature is too high 2. The injection pressure and speed is too low, and thecycle is too short 3. Lack of holding pressure (time) 4. Bad cooling timesetting 5. Check valve is undesirable |
1. Gate or runner is too small 2. Theselection of gate position or type is not good 3. Gate condensation is tooearly 4. Rib is too thick 5. The flow is unbalanced |
1. Materialmobility and shrinkage are not desirable 2. Feed back consumption is too big
|
Insufficient filling |
1. Melt adhesivesamount is insufficient 2. Barrel temperature is too low 3. Back pressuresetting is not good 4. Injection pressure (speed) is insufficient 5. Injectiontime is too short 6. Check valve clearance is big 7. Nozzle is blocked |
1. Mold temperatureis too low 2. Inappropriate selection of the gate type or position 3. Badexhaust of the mold 4. Mold runner (gate) is too small 5. Mold cavitydistribution is unbalanced |
1. Material fluidityitself is not good 2. Poor material drying |
Flow mark |
1. Barrel temperatureis too low 2. Injection pressure is too low 3. Lack of holding pressure (time) 4. Cycle time is inappropriate 5. Melt adhesives stay in feed-pipe too long |
1. Mold temperatureis too low 2. Gate or runner is too small 3. Bad exhaust |
1. Material mobilityis not desirable 2. Lubricant is inappropriate 3. The volatile matter is toomuch |
Bubbles |
4. The injectionspeed is too high 5. Molding filling is not enough 6. Temperature in everysection of the feeding-pipe setting is not good |
1. Mold temperaturein places of thick wall (stiffening rib) is too high 2. Gate or runner is notgood 3. The selection of gate type or position is not good 4. Gate condensationis too early 5. Mold temperature is too low 6. Bad exhaust |
1. Materialmobility and shrinkage are not desirable 2. Feed back consumption is too much 3. Raw material is not fully dried
|
Surface gloss |
1. Barrel temperatureis too low 2. The injection pressure is not enough 3. Temperature of injectionnozzle is low 4. Melt adhesives in feed-pipe is too long 5. Molding cycle is inappropriate |
1. Mold polish is poor 2. Gate or runner istoo small 3. Gate type or position is inappropriate 4. Bad exhaust 5. There’sforeign body on the mold surface |
1. Material isnot fully dried 2. Fluidity function is inappropriate 3. The polish of materialitself is poor
|
Bubbles Size difference
|
1. Material supply isunstable 2. The screw rotation speed is unstable 3. Temperature is out ofcontrol, the back pressure is unstable 4. Screw reset is unstable 5. Themolding cycle is unstable |
1. Mold strength andrigidity are not enough 2. A multi-cavity is used which is not good 3. The topout system, feed system and cooling system setting are not reasonable |
1. Materialdryness is not good with uneven particles 2. The contraction percentage of rawmaterial is too big 3. There exists batch difference in material viscosity
|
