ZHONGDECustomizing | Manufacturing
Zhongde, a reputable plastic and rubber injection molding company in China, provides insert and overmolding services and produces unique multi-material parts.
Both over-molding and insert molding injection processes by Zhongde, a reliable injection molding supplier, involve putting two types of materials together to make one part. And the inserts can be threaded metal inserts. Overmolding is a two steps process that one to create the substrate and one for the oversold that goes on top of it. China insert molding is a slightly faster process as it takes only one step that the two materials are molded at the same time.
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In addition to the general materials listed below, Zhongde, a reliable custom rubber injection molding company, can also modify the materials according to the special needs of customers. Our professional engineers will adjust the raw material formula to meet the unique conditions of use. Our production materials of custom over-molding and insert molding range from thermoplastic to elastomer-rubber, as well as metal and silicone. We've broken down the differences and similarities between the two processes. Let us help you decide which process is right for your project.
Overmolding is a process where a single part is created using two or more different materials in combination. Traditonally, overmolding starts with injection molding a hard plastic resin that has a higher melting point. Once that part is cooled, another material is injection molded over the first part, resulting in a single, finished product.
Insert molding combines metal and plastic injection molding service into one single part. It allows plastic to bond to insert pieces, mostly brass or stainless steel metal component, which go inside a mold cavity. There are many options for insert that can be placed into the mold. A few of examples are warming labels, threaded bushings, wires, batteries, etc.
ABS | Acrylonitrile Butadiene Styrene
PA 6 | Polyamide 6, Nylon 6
PA 6/6 | Polyamide 6/6, Nylon 6/6
POM | Acetal Polyoxymethylene, Delrin
PP | Polypropylene
PE | Polyethylene
LDPE | Low-Density Polyethylene
HDPE | High-Density Polyethylene
UHMWPE |Ultrahigh Molecular Weight Polyethylene
PTFE | Polytetrafluoroethylene
PEEK | Polyether Ether Ketone
PC | Polycarbonate
PMMA | Polymethyl Methacrylate, Acrylic
PS | Polystyrene
PVC | Polyvinyl Chloride (Shore D)
PU | Polyurethane
NR | Natural Rubber
NBR | Nitrile Rubber
SBR | Styrene-butadiene Rubber
HNBR | Hydrogenated Nitrile
CR | Neoprene Rubber
VMQ | Silicone
LSR | Liquid Silicone Rubber
FVMQ | Fluorosilicone
FKM | Fluorocarbon
FFKM | Perfluorocarbon Rubber
EPDM | Ethylene-Propylene Diene Monomer Rubber
IR | Polyisoprene Rubber
IIR | Butyl Rubber
|Machining Types||Case Display|
|Bonding the resin to the metal|
|Metal insert into the resin|
|Rubber onto plastic|
Below table shows the size of Overmolding & Insert Molding parts we usually make. If you need a larger size, we can also help you achieve it.
Absorb UV radiation, slowing down the degradation of the material when used outdoors.
Prevent ignition and inhibits spread of fire.
Increase flexibility and promotes plasticity, reducing brittleness of the material.
Used to color plastics.
Increase strength, toughness, and rigidity of the material at the expense of making the material more brittle.
Increase strength, toughness, and rigidity of the material at the expense of making the material more brittle. It is more flexible than carbon fibers.
For product designers and engineers, surface finish on molded parts is an important design consideraton. Most polish and texture is appled directly to the mold itself and trasferred to the parts during the injection molding process. Following are serveral surface finish options for molded parts.
The mold is smoothed and then polished with a diamond buff, resulting in parts with a mirror-like finish.
The mold is smoothed with fine grit sandpaper, resulting in parts with a fine surface finish.
The mold is smoothed using fine stone powder, removing all machining marks.
The mold is first smoothed with fine stone powder and then sandblasted, resulting in a textured surface.
The mold is finished to the machinist's discretion. Tool marks may be visible.
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