Body _TPE _ PBT_Bi-Injection Mold& 2K-Injection Mold for Plastic Injection Parts_Cup Cover

Why Use Plastic Overmold Molding?

One of the main reasons that an overmolding design is used is that it improves the overall aesthetic design and functionality of a product. Numerous color options can be created through plastic overmolding. Substrate molding also allows crucial details to be added to products for a specific consumer use. For example, a screwdriver may be fitted with a colorful and comfortable handle through the overmolding design process. Other reasons to use plastic overmolding, include:
      •Provides a soft grip surface around a part of the separate material.
      •Break up color (aesthetic impacts).
      •Adds flexible areas to a rigid part.
      •Eliminates assembly line time. Instead of manufacturing a metal tool and a plastic hand grip separately and then joining the two together manually or with automation, you can just     overmold the metal tool with a plastic hand grip and eliminate the need for assembly altogether.
       •Captures one part inside of another without having to use fasteners or adhesives.
       •Improve grip and ergonomics
       •Provide electrical insulation
       •Create a waterproof seal
       •Dampen vibrations or absorb sound
Overmolding applications:
      •Electronics
      •Automotive Parts
      •Medical Devices
      •PCB (Printed Circuit Boards)
      •Flex PCB (Flexible Printed Circuit Boards)
      •RFID (Radio Frequency Identification Tags)
       •Defense/Military Components
      •Aerospace Components
In-Mold Assembly
       Overmolding is called in-mold assembly Sometimes, since the resulting part essentially assembles two materials rather than creating a layered structure. Both individual components and assemblies can be overmolded. But regardless of the application, achieving a mechanical or chemical bond between the substrate material and the overmolded component is crucial.
•Plastic overmolding can help reduce production time because the second piece is molded directly onto the original part rather than having to completely manufacture the two pieces separately and then assemble them.  Over molding is also a very difficult process, requiring adherence to the very tightest of tolerances.
•Overmolding type
•Plastic over metal
•Rubber over metal
•Plastic over plastic
•Rubber over plastic

Selecting the Material
the range of overmold materials hasexpanded to include many classes of elastomeric resins.Such resins include thermoplastic polyurethane (TPU),styrene-ethylene/butylene-styrene copolymer (SEBS),copolyesters, copolyamides, thermoplastic rubber (TPR),and thermoplastic vulcanate (TPV).
The traditional material of choice was a modified polypropylene-based resin with the ability to adhere to a polypropylene substrate.

How to guarantee the quality for plastic injection molding
   -- DFM (design for manufacture) & Mold flow analysis
   -- Skilled & professional technical English communication with our customers closely
   -- Over 10 years of experience in mold design,  Plastic injection Molding Manufacturing and Part assembly.
   -- Always quickly responds to our customers
   -- Dimension measure by CMM/OMM or ATOS (GOM)
   -- Various type of products service including Automotive injection mold & Molding, Home Appliances, Industrial Molds & molding, Medical molds & Molding and more

What we can offer you
We are a world class injection molds company with the capability to design and build inexpensive and efficient plastic molds and ship the molds to the American, Europe and the world, the mold standard we use HASCO, DEM, MISUMI, MEUSBURGE, PROGRESSIVE etc, or according to customer requirement, the hot runner systems we use YUDO, INCOE, SYNVENTIVE, HASCO, MOLD MASTER,HUSKY etc, or use hot runner base on the customer special requirement. The mold steel we normally 1.2738H, 1.2738HH, 1.2344, 1.2343, S136, NAK 80 , TOOLOX 44 bon HRC44 , UHB UNIMAX , UHB ELMAX , UHB ORVAR ,UHB MIRRAX or sue steel according the the customer needs.

Mold Construction
ChangDa overmolding TPEs are generally non-abrasive and non-corrosive. The choice of tool steel will depend on the quantity and quality of parts to be produced, the longevity of mold required, and the type of rigid substrate being used in the application. If a reinforced substrate material is used, high hardness abrasion resistant steel will be required. For high volume two-shot or insert molded component production, the initial expense of high quality injection mold tooling is a sound investment. P-20 steel is typically used for mold bases and ejector plate, while H-13 steel is used for cavity and core plates. For applications that require optimum cooling, beryllium copper cores are common.
Most Changda materials replicate the mold surface fairly well. A polished mold is required to produce a glossy surface or optimum clarity. To produce a part with the matte appearance of a thermoset rubber, a rougher mold surface is required. In general, an EDM finish will produce a good surface and good release from the mold. Vapor honing, sand or bead blasting and chemical etching may also be used to produce surfaces with varying degrees of gloss and appearance. To aid in release, the cavity or core may be coated with a release coating, such as PTFE impregnated nickel, after it has been given a sand blast or EDM finish.


About us:
CHANGDA is a ISO/TS16949 approved mold company with core competence only severing consistent uncompromising quality overmolding product to our customer. provide the best quality of overmolding parts and provides speed-to-market advantage. CHANGDA supplies the best quality overmolding Automotive (Vehicle) parts to our valuable customers (including Automotive Tier One and Tier Two customers) all over the world. Furthermore, our overmolding components are well-suited not only to the Automotive, but also the Electronic,
*3D Scane result( ATOS measurement)

*Mold Flow




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