What is Injection Molding?
Injection molding is a method of forming a product by injecting molten plastic into a mold and then cooling and solidifying it,which is suitable for mass production and complex shape products.
Shanghai Jinxi Injection Molding Services
Except CNC Machining, we also make plastic molds and injection parts both for prototyping and mass production.
Early involvement in customer products analysis
Design Software: UNI-GRAPHIC, Pro-E, CATIA,Auto CAD
Tolerence: CNC- 0.01mm,EDM-
0.01mm, Grinding- 0.005mm
Provide DFM & Mould Flow analysis report
Mould design and machining
Mould design and modification
Mass production for continious orders running
Custom Molding Service
Single-cavity, multi-cavity, and family mold options
Double color Molding
Press availability from 50 to 1,100+ tons
Injection Molding Materials
ABS: High impact resistance with low density,”Tough, hard, rigid, cheap”.The comprehensive performance is good and used widely in machinery, electrical, textile, automobile, aircraft, ships and other manufacturing industries and chemicals.
PA: High mechanical strength, good toughness, high tensile strength which is higher than metal and the compressive strength is close to metal. The impact strength is much higher than ordinary plastic.
PC: PC has good mechanical properties, but poor fluidity.The drying before injection is very important and the recommended drying conditions are 100C to 200C for 3 ~ 4 hours. The humidity before processing must be less than 0.02% .
PP: PP is a crystalline polymer. The density of PP is only 0.91 g/cm3(smaller than water) . In general purpose plastics, PP has the best heat resistance. and also good resistance to stress cracking and high bending fatigue life. The comprehensive properties of PP are better than those of PE.
PE: Polyethylene (PE) is the most widely used synthetic resin due to its excellent processability and serviceability
PC-ABS: The alloys of PC and ABS, PC has strong impact resistance, high heat resistance while ABS has very good toughness, so this material is better performance than a single PC or ABS and, more expensive.
POM: High crystalline polymer with high elastic modulus, high hardness and high stiffness. Can be used in-40-100 °C for a long time. It’s the most superior type among the thermoplastic material on fatigue resistance.
Injection Molds Surface Finish
We generally polish it a little with 800#sandpaper if no special requirement.
General use of stone, wool wheel or sandpaper, mainly done by manual. We can make it mirror polishing if requsted.
This texture is done by EDM Machining on the mold.
There are many types of the different texturing. and the often used here including MT11010, MT11020.
Electroplating is the process of depositing metal or alloy on the surface of a work piece by electrolysis to form a uniform, dense and well-bonded metal layer.
Sand blasting is a surface treatment of the workpiece process, using Compressed air as the power to form a high-speed jet to the surface of the mold.
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Advantages of Injection Molding
Mold Design Ability
the Design and programming software we use here including UG, Solidworks, Pro/E, Mold Flow
Insert Molding and OverMolding
Insert molding is to have the metal insert pre-positioned in the mold and then injected into the plastic for molding, so that you can get a final product with an insert tightly embedded like a threaded ring,a brass nut or an electrode.
This type of molding will help to make parts all at once instead of post-assembly, especially when the inserts very small and quite a few ones on one part,it’ll save the assembly trouble a lot. also it’ll improve the product strength, since one-shot process will make the embedding very tight and easy to use.
Overmolding is actually one type of secondary injection molding which includes 2 parts,one is the main body (the hard plastic), and the other coating part (the soft one). When making molds we need to make the hard one first,and then put it into the coating mold.
The often used overmolding plastics as below
main body: ABS, GPPS, HIPS (475) , PA (PA6, PA66) , PC, PE, POM, PP, etc.
coating part: TPE, TPR, TPU, TPV, TPEE, PVC, etc.