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Overview: How Injection molding works?

Injection Moldling

CNP’s rapid injection molding process results in an identical set of durable parts for testing and multiple backups. This process has a longer lead time, but it is usually worth it for a product with strict material and mechanical requirements.

The Basics Of Injection Molding Service

Injection molding is one of the most often-used manufacturing processes for creating plastic parts. Thanks to its high-precision, repeatability, and cost efficiency at scale, injection molding is used to make a variety of products and parts from the smallest medical insert up to large automotive & aerospace and defense parts. The injection molding process requires an injection molding machine, raw plastic material, and a machined mold. The raw plastic material is first melted in the injection unit and is then injected into the mold — most often machined from steel or aluminum — where it cools and solidifies into the final plastic part. The key steps in the injection molding process are clamping, injection, cooling, and ejection.

How Injection molding Works

The sequence of events during the injection mould of a plastic part is called the injection molding cycle. The key steps in the injection molding cycle are:
Clamping: The two sides of the mold are closed and clamped shut.
Injection: The material is fed into the machine and pushed towards the mold. While this is happening, the material is melted by heat and pressure. The plastic is then injected into the mold — this is called the “shot.”
Cooling: The plastic in the mold cools and solidifies into the shape of the part.
Ejection: After the part cools, it is ejected from the mold.

Features of Injection Molding Service


100+ materials
We offer many available injection molding material, also customizable
Accuracy & Efficiency
All sheet metal parts are built on-demand and with lower setup costs compared to CNC Machining. Depending on your needs, order as little as a single prototype up to 10,000 production parts.
Molding can be the ideal process for custom production runs of 1-500,000+ parts.
Stable & Durable
Injeciont mold produces real end products that has awesome durability.
Rapid Turnaround
With rapid molding, molds ready in 15 days, parts shipped in 1 to 15 days
Surface Quality
Injection molds are precisely CNC milled and polished, which gives the parts terrific surface, customizable treatments are also available.


Structure Limits
Interlocking and hollowed structure is difficult to be produces in one pieces with Injection Molding.
Startup Cost
For small batch production, the starting cost is not as affordable as CNC milling or 3D Printing.

Injection Molding Materials

Rigid And Flexible Plastic Varieties,Rubber-Like Varieties
Hard Plastics Flexible Plastics
ABS | Acrylonitrile Butadiene Styrene Polyethylene (PE)
ASA | Acrylonitrile Styrene Acrylate Polystyrene (PS)
CA | Cellulose Acetate PET
COPO | Copolyester EVA Foam
PCT | Polycyclohexylenedimethylene Terephthalate EPS Foam
PPA | Polyphthalamide PU Foam
HDPE | High-Density Polyethylene
PEEK Rubber-Like Varieties
TPE | Thermoplastic Elastomer, Santoprene
Polypropylene (PP) TPU | Thermoplastic Polyurethane (Shore A)
Polycarbonate (PC) LSR | Liquid Silicone Rubber
PMMA | Polymethyl Methacrylate, Acrylic LSR | Liquid Silicone Rubber
Nylon 12(PA12) PVC | Polyvinyl Chloride (Shore A)
Nylon 6/66(PA6/66) POE | Polyolefin Elastomer
Derlin (POM) MPR | Melt Processable Rubber
Teflon (PTFE) EPDM | Ethylene Propylene Diene Monomer Rubber, Viton
PBT Mixed plastic
PC-ABS | Polycarbonate-Acrylonitrile Butadiene Styrene
PLA | Polylactic Acid PC-PBT | Polycarbonate-Polybutylene Terephthalate
High-Density Polyethylene (HDPE) PC-PET | Polycarbonate-Polyethylene Terephthalate
PVC PS-PPE | Polystyrene-Polyphenyl Ethers
PPS | Polyphenylene Sulfide, Ryton PE-PS | Polyethylene-Polystyrene
Vespel (PI) PE-PP | Polyethylene-Polypropylene
Torlon 4203 (PAI) PBT-PET | Polybutylene Terephthalate-Polyethylene Terephthalate
UPE/UHMW PBT-PET | Polybutylene Terephthalate-Polyethylene Terephthalate

We offer a free consultation to discuss your prototyping, casting, or machining challenges.

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