Plastic Injection Molding Parts

Valiant Electronics is a Plastic Injection Molding Parts Manufacturer.  We have the capability and experience to make high precision plastic injection molding parts.   To truly make high-quality injection parts you will need good injection molding machines, well-designed molds and good operators and technicians.   We use a combination of injection molding machines ranging from Haitian to Sumitomo/Demag injection molding machine to achieve best results.   We judge injection machine by consistency in repeat-ability in producing parts over a long period of time, meaning if the machine is running for 24 hours there should be no change in the quality of parts or the way how the machines behave.  This is where the term ‘workhorse’ machine came in.  Now that you have the proper injection machines, the next step is to get a good mold.
Plastic injection molding parts quality is highly dependent on the design and material used to build the mold.   You have to start with the proper steel material.   There are several reasons why you would want to use high-quality steel material because this could make the difference in a mold that breaks all the time or a mold that can make thousands or millions of parts consistent with little or minimal maintenance, which is what the objective is.   High-quality steel material will mean that the mold will not bend easily and break or bend out of tolerance when the mold is put under pressure by the injection molding machine.  Also from our experience, high-quality steel material has better heat expansion and contraction predictions that lower quality steel material.   So with the correct calculation, you can know how the material will behave and make the parts with the more precision.   Now that we have the right steel material we can now design the mold.
Designing plastic injection mold requires a deep understanding of heating, cooling, of steel and all plastic material.   Sometimes the mold has to be heated to a certain temperature before the parts can inject and the mold has to be cooled to remove the parts from the mold.   Without a deep understanding of heat, cooling, material expansion, and contraction can be the difference in make a part that is within tolerance or out tolerance.   You can have parts that are too brittle or parts that contract too much.
Valiant Electronics has the experience and knowledge to manufacture plastic injection molding parts to the highest quality required by the highest quality.
Plastic Injection Molding Parts
Some Material Used or material our customers specify. ABS
ABS(30% glass)
ABS – Medium Impact
ABS – High Impact
Acetal Homopolymer
Acetal Copolymer
Acrylic / PMMA
ASA(Acrylonitrile Styrene Acrylate)
EVA(Ethylene Vinyl Acetate)
EVA(Wide-Spec)
Nylon 6
Nylon 6(15% glass)
Nylon 6(25% glass)
Nylon 6(30% glass)
Nylon 6/6
Nylon 6/6(10% glass)
Nylon 6/6(25% glass)
Nylon 6/6(30% glass)
Nylon 4/6
Nylon 4/6(30% glass)
Nylon 11
Nylon 12
Polycarbonate
Polycarbonate High Impact
Polycarbonate(30% glass)
Polcarbonate + ABS
Polycarbonate + PET(Imp. Mod)
ICIS Polyethylene Reports
HDPE
HDPE(widespec, virgin)
HDPE(co-pp)
LDPE
LLDPE
PBT
PEEK(30% glass)
PET
Polyester
Polyether Block Amide(PEBA)
ICIS Polypropylene Reports
Polypropylene
Polypropylene Copolymer
Polypropylene Copoly(10% glass)
Polypropylene Copoly(20% glass)
Polypropylene Copoly(30% glass)
Polypropylene Impact Copoly
Polypropylene Homopolymer
PP Homopoly(30% glass)
PPA
PPE+PS(PPO)
Polystyrene(GPPS)
Polystyrene(HIPS)
Polystyrene(MIPS)
PVC – Flexible
PVC – Rigid
Silicone Rubber
Thermoplastic Elastomer(TPE)
Plastic Parts Tolerance +/-0.004″(+/-0.1mm)
Injection Machine Size 50-500 tons
Application Security, industrial, consumer electronics, health, Automotive
Software Used Pro E, Solid Works, AutoCAD etc
Certification UL, ISO9002, ISO/TS16949
Plastic Design Guideline Injection Molding Design Guidelines Guidelines for designing plastic parts:
1) Use uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times.
2) Use generous radius at all corners. The inside corner radius should be a minimum of one material thickness.
3) Use the least thickness compliant with the process, material, or product design requirements. Using the least wall thickness for the process ensures rapid cooling, short cycle times, and minimum shot weight. All these result in the least possible part cost.
4) Design parts to facilitate easy withdrawal from the mold by providing draft (taper) in the direction of mold opening or closing.
5) Use ribs or gussets to improve part stiffness in bending. This avoids the use of thick section to achieve the same, thereby saving on part weight, material costs, and cycle time costs.
Plastic Injection Process
Mold Making Process