plastic injection molding processing

Bacical mould Bacical mould structurestructure

Injection Moulding Injection Moulding

Learn some basic injection moulding

1.1.Injectio material Injectio material 6.6.Mould process(General)Mould process(General)

2.2.Mould design Mould design 7.7.Mould processMould process((Angle PinAngle Pin))

3.3.Gate materialGate material 8.8.Mould process(SlideMould process(Slide))

4.4.Ejector PinEjector Pin 9.9. Part deflect Part deflect

5.5.Injection Moulding Injection Moulding 10.10. Moulding parametre Moulding parametre

Injection Injection materialmaterial

Why we use plastic material ?

Cheap than steel

Light than steel

Insolate。

Resistance chemical reacts。

Waterproof non corroding

Easy molding

Different material popular application

Recycle and Reuse

Short production cycle time

Rich resource

PC

PAPC

PATPE

PC 280oc-320oc 60oc-80oc 120oc/4 h

POM 190oc-220oc 80oc-120oc 120oc/3 h

PA 280oc-300oc 40oc-80oc 80oc/10 h

ABS 230oc-270oc 60oc-80oc 80oc/3 h

ASA 240oc-280oc 40oc-80oc 80oc/3 h

PC/ABS 240oc-280oc 70oc-100oc 110oc/4 h

Material Melt Temp Mould Temp Dry Temp and time

Clamping Unit Mould Injection unit

Mould Mould designdesign

Plastic parts

Mould

Move Mold

Fix Mold

A B

A=　Move Mould

B =　Fix MouldWhy it should be move？？

If the mould cannot openIf the mould cannot open

the part cannot take it outthe part cannot take it out

Move MouldMove Mould

Fix MouldFix Mould

Open it in here

How to put the material inject into mould inside?

Move MouldMove Mould

Fix MouldFix Mould Guid Guid pinpin

Sprue materialFix MouldFix Mould

Move MouldMove Mould

Fix MouldFix Mould

Move MouldMove Mould

The surface is rough, the sprue material is hard to demoulding.

Sprue

Sprue

Sprue

Sprue

Sprue material

Melt material reach to the gate at Melt material reach to the gate at the same timethe same time

its important its important

What is gateWhat is gate????

Gate Gate = = Joint to the parts and spure materialJoint to the parts and spure material

Unbalance sprue material design

FlashFlashShort fillingShort filling

Balance sprue material design

Injector pinInjector pin

Injector pin use to the part eject.Injector pin use to the part eject.

make the complex part eject from the fix mouldmake the complex part eject from the fix mould

easy to take it out by operator or roboteasy to take it out by operator or robot..

Eject structure as an example

Eject structure as an example

Eject structure as an example

Eject structure as an example

Eject structure as an example

Injection Injection moldingmolding

Clamping unit Mould Injection unit

20

80

120

300220

Inject/Injection

Crystal Cooling

Heat

Clamping

开始注塑

注塑 = 把已熔化的原料注入模具内

注塑

Packing injection

Packing

Cooling

Measure

Measure

Measure 松退

Open mould

Part enject

Injector pin return

Clamping

Injection molding Injection molding processprocess((GeneralGeneral))

Injection Injection molding molding

processprocess((SlideSlide))

e.g

When mould open, the part cannot take it out.

Injection molding Injection molding processprocess((Angle pinAngle pin))

e.g

Part Part deflectdeflect

unfillingunfilling

OK

StainStain

OK

Sliver markSliver mark

BruiseBruise

Air bubbleAir bubble

OK

OK

OK

BruisedBruised

BurrBurr FlashFlash

OK ok

Injector markInjector mark Welding lineWelding line

Moulding Moulding parameterparameter

Temperature

Time

Pressure

- Temperature- Material melt temp- Melting temp.- Moulding temp (cooling temp)

- Time- Injection - Cooling - Packing (keep pressure)- Ejection - Open/close

- Pressure- Clamping- Injection - Ejection

Temperature

Advantage

Disadvantage

- Good flow- Easy crystal

- Flash- Innerstress- Shrinkage, sink。。。

Temperature

Disadvantage

- Less flash- Lower Innerstress

- Welding line- Short filling

Advantage

Time Disadvantage

- Part size stabilize

- High cost- Low output

Advantage

TimeDisadvantage

- Largest output

- Size unstablize

Advantage

Pressure

Disadvantage

- Good flow- Thinner filed can be inject

- Flash- Innerstress

Advantage

PressureDisadvantage

- Lower innerstress

- welding line- Short filling- Size unstablished

Advantage

Learn more us please visit our homepage

Welcome you any inquires.

Thanks

Daisy Dong

daisy@forwa-mould.com

86-1802 826 8854

www.forwa-mould.com

Forwa Mould Precise Plastic Mould Co.,Ltd