Plastic injection molding parts from 2fprototypes

How the molded part is produced?

The whole process to produce a part is short. For large parts as shown in the video, there are additional mechanical devices to help pour the plastic pellets and take the molded part out to the transport tape. The first quality inspection will be performed at the end of the transport tape.

Material

Color

Advantage

Disadvantage

Polystyrene/PS and modified polystyrene/HIPS

Transparency

Good fluidity for easier processing;
Good dimensional stability; Easier coloring;

High brittleness for poor shock resistance;
Can be scratched on the surface easily;
Poor acid resistance for crazing;

Propylene - butadiene - styrene polymers/ABS

Light yellow

The best electroplate ability among plastics;
The ingredient of butadiene improve the shock resistance greatly;
Good surface gloss;
Low shrinkage for reliable dimension;

Organic solvent intolerance, can be dissolved into emulsion when combining with ketone, ester, aldehyde, and chlorinated hydrocarbon

Polyformaldehyde/POM - Crystalline plastics

Milk white

Comprehensive mechanical performance;
High rigidity and hardness; Excellent worn resistance and self-lubrication;
Organic solvent tolerance;
Low moisture that can maintain stable dimension;

Low acid resistance;
Low adhesiveness;

Polyethylene/PE - Crystalline plastics

Translucent particles. It shows milk white in whole piece condition; The transparency falls with density growing, as known as HDPE(high density) and LDPE(low density)

Usually used for blow molding products;
Its chemical properties are reliable that can’t be dissolved into any solvent under room temperature;
Good toughness and extensibility even at low temperature;

Poor mechanical strength;
Low adhesiveness;
Scratch on the surface easily;

Polypropylene/PP - Crystalline plastics

Translucent

Lightweight;
High tensile strength;
Good formability;
Good wear resistance;
Shock resistance under room temperature;

High forming shrinkage(1.6%) that plastic part can be deformed and shrink easily;
Low adhesiveness;

Polyvinyl chloride/PVC

Translucent

It is soluble in cyclohexanone and dichloroethane;
The softness of range can be extended after plasticizer is added;
Good fire resistance;

High shrinkage of soft PVC(1-2.5%);
The PVC molecule absorbs water easily so that it needs to be dry before forming;

Polycarbonate/PC - Crystalline plastics

Transparency

The best plastic of shock resistance; Low forming shrinkage(0.05-0.7%) that the end-part is precise and the dimension is stable;
Burning slowly;

Can be dissolved in organic solvent such as alkali, ketone, aromatic hydrocarbon, etc.
Poor fatigue resistance;
Significant ESCR;

Polyamide/PA/Nylon - Crystalline plastics

Black, white

Good toughness;
Good wear resistance;
Good fatigue resistance;
Good self-lubrication;
Good self-extinguishment;
Good strength of extension;

High water absorption

polymethyl methacrylate/PMMA/Acrylic

Transparency

Burning slowly;
High transparency;
Forming easily;

Scratching easily

EDM machines from 2fprototypes

Tooling machine from 2fprototypes

Injection molding machines from 2fprototypes