Small Precision Insert Molding

No MOQ (Minimum Order Quantity)

Fast Delivery Time

Consistent Product Quality

Competitive Price

Professional Services (Before & After Sales)

References from our existing customers can be provided upon request.

Competitive Price + Excellent Quality + Outstanding Services = Happy Customers

Starting from product design validation, prototyping, injection mold fabrication, mass production to secondary or finished product assembly, we offer turn-key contract manufacturing services to our customers.

Whether your program requires a simple single cavity, open and shut mold, or a complex, multi-cavity, multiple action mold, Shenghua has the experience to confidently handle your job.

We have 12 injection machines, ranging from 50 ton up to 450 ton, and can mold single part up to 1.5 kilograms in weight. Our injection shop runs on 2 shifts, 7 days a week.

What's Insert Molding

Insert Molding is an injection molding process that utilizes an insert placed in the molding cavity.
A molecular bond is established when using materials that are similar to the surrounding resin. A mechanical bond is established when using materials that are dissimilar to the surrounding resin. When comparing the two, for obvious reasons the molecular bond is stronger than the mechanical. For best results in using the mechanical bond process, it is important to use an insert that is capable of handling the surrounding plastic.

Insert molding can be used for molding fasteners, pins and terminals, and is widely used for molding parts needed in constructing medical equipment.

A variety of materials are used in insert molded plastics. These include:

ABS
Hi-Impact Styrene
Nylon
Acetal
Polycarbonate
Rigid PVC
Flexible PVC
Many various types of filled materials:
Glass Filled Nylon
Valox
Norel
Flex PVC - Thermo Plastic Rubbers
Rigid PVC - Injection Large, Small
Many various types of exotic materials

Plastic Injection Molded Parts Quality Control Procedures We Follow:

1. Machine Inspection (On-The-Spot Inspection)

Parts are initially inspected directly out of our molding machine. Our machine operators are trained to identify and rectify the following defects:

1.1.Sink marks that form when the outer plastic shell hardens before the internal plastic has had an opportunity to cool.

1.2.Short shots caused when there is an inadequate amount of plastic material to fill the mold.

1.3.Burn marks caused by trapped compressed air during the molding process.

1.4.Flash marks, which is the excess plastic that extends from the end of the molded part

2. Finishing Station Inspection

Parts at the finishing station are inspected for consistent finishes and textures prior to silkscreen or pad printing.

3. Quality Control Department Inspection

Finished parts undergo one final inspection to ensure tolerances are met for every part. Optical projector and digital calipers measure for part accuracy to within =/-.005mm.

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Why You Should Also Consider Importing Injection Molds to Your Own Country for Mass Production?

Not ALL plastic injection molds are necessarily cheaper to stay in China for mass part production, otherwise China would not have become the world’s largest mold exporter.

The following conditions will justify your bringing the molds to your own country for mass production:

1. High production volume and the plastic product is bulky, which translates to high transportation cost, even by ocean shipment.
    
2. Plastic products that do not require lots of labor for assembly, or assembly with many other non-plastic components.
    
3. Plastic product that calls for very short delivery time.
    
4. Plastic products that do not require silkscreen printing, pad printing, heat transfer printing or any other secondary treatments.

If the plastic part or product you intend to develop and produce falls under none of the above conditions, the chances are that it’s better to leave the injection molds in China for production.