What is overmolding

Overmolding is a procedure where you making one singular thing by using two or even more matters- in different variants.

Usually, the main matter is used to call as “substrate”, is semi or fully amplified by the overmold material across this process

The list of a substrate could be very long and in some way – you can use almost anything for it. For example, you may use a button or metal part of your machine and many more. The overmold materialsshow up in pellet shape and in most cases, it is by plastic. The shape of overmold materials has to go through a phase of merging with colorants, foam fillings, and others. The next step is to heat them until they reach their point of melting so they become a liquid and injectable to mold tool. All materials are not suitable for overmolding- it depends on the compatibility of the material.


The overmolding as a specific process may be used for many things. It has advantages and disadvantages.

It may help you to improve and remodel your design, in aesthetic and functionality ways. This option is absolutely endless- you can add colors in different ways with overmolding. Overmolding lets you choose between thousands of colors that fit with plastics. Also, the great part of overmolding is you can add a wide specter of details on the product according to your needs. Overmolding is brilliant because it can offer you safety- sharp corners and edges can be very dangerous so we can smooth them by overmolding. It is an amazing way to protect workers and people who live in your house.

In modern ages, overmolding is increasingly represented- there is no person that becomes aware of the need for remodeling.

Besides all the good benefits of overmolding, there are some troubleshooting and limits related to it.

Problems that appear in most of the cases are a bad merger, not enough of filling into substrate and differences between materials even of the same class that are not compatible. For example, if you want to pair up a metal part with the plastic you can do it by picking any plastic but if you want to

connect plastic to plastic you may find the issue of compatibility. A problem that builds on this one is that sometimes we are conditioned to do overmolding with more than two materials and we can only imagine how difficult it could be to combinate them.

In the end, the most common usage of overmolding is improving the performance of the product. It leads us to the best variety (safety, appearance) of a product but at the same time, it may be very difficult to achieve that- depending on class and number of material.

Always weight few factors before the conclusion of overmolding and if it is the best solution. The conclusion is simple- overmolding presents the best way to combine two or more different parts into one, which is improved and presents the best features of both items

China Plastic Storage Box Mould

Recently fast cycle time Plastic Food Storage Containers mould is very popular among clients as it could increase product ability. HYX MOULD is just the one which is specialized in making storage box mold and devoted to offer best mould to satisfied customers need.

We are the professional storage box mold manufacturer with rich experience. The main characteristic of our storage box mold is fast cycle time and that reach high reputation among clients.

We made effort to achieve fast cycle time by doing below points.

  1. The application of Copper Beryllium lead the optimal cooling system and the stroke switch control make ejection demolding precisely.
  2. Hot runner system with 4tips or 1tip in reasonable position.
  3. Servo motor injection molding machine plays important role as its high performance.

If you are still looking for Chinese storage box molds, please give us a chance to establishing relationship with you.

Automatic Flip Closure Mold
HYX MOULD is well known as China closure mould manufacturer which is producing shampoo cap mould and toothpaste cap mold.

The most characteristic is that we are specializing in producing flip top cap mould with inside clothing. Use of this technology, the flip top cap is automatic demoulding. It saved cost and time. To some special requirements, plastic injection flip cap mould will adopt unscrewing system with motor or hydraulic cylinder rack ejection.

What is Plastic Injection Molding

Injection molding is a molding procedure whereby a heat-softened plastic material is forced from a cylinder into a relatively cool cavity giving the article the desired shape. Injection molding is a manufacturing technique for making parts from the plastic material. Molten plastic is injected at high pressure into a mold, which is the inverse of the desired shape. The mold is made by a Mold Manufacturer China Company from metal, usually either steel or aluminum, and precision-machined to form the features of the desired part. Injection molding is very widely used for manufacturing a variety of parts, from the smallest component to entire body panels of cars.

The process of plastic injection molding

An injection molding machine consists of three basic parts, the mold plus the clamping and injection units. The clamping unit is what holds the mold under pressure during the injection and cooling. Basically, it holds the two halves of the injection mold together.

During the injection phase, plastic material, usually in the form of pellets, are loaded into a hopper on top of the injection unit. The pellets feed into the cylinder where they are heated until they reach molten form (think of how a hot glue gun works here). Within the heating cylinder there is a motorized screw that mixes the molten pellets and forces them to end of the cylinder. Once enough material has accumulated in front of the screw, the injection process begins. The molten plastic is inserted into the mold through a sprue, while the screw controls the pressure and speed.

The dwelling phase consists of a pause in the injection process. The molten plastic has been injected into the mold and the pressure is applied to make sure all of the mold cavities are filled.

Then the plastic is allowed to cool to its solid form within the mold. The clamping unit is then opened, which separates the two halves of the mold. An ejecting rod and plate eject the finished piece from the mold.


A machine used to extrude materials is very similar to the injection-moulding machine explained above. A motor turns a thread, which feeds granules of plastic through a heater. The granules melt into a liquid, which is forced through a die, forming a long ‘tube-like’ shape. The extrusion is then cooled and forms a solid shape. The shape of the die determines the shape of the tube.

Advantages of Injection Molding 

– High tolerances are repeatable 

– Wide range of materials can be used 

– Low labour costs

– Minimal scrap losses 

– Little need to finish parts after molding

Plastic Injection molding
Plastic Injection molding

Disadvantages of Injection Molding

– Expensive equipment investment 

– Running costs may be high 

– Parts must be designed with specific molding consideration.


Injection molding is a relatively new way to manufacture parts. It is a fast process and is used to produce large numbers of identical items from high precision engineering components to disposable consumer goods. Injection molding is often used in mass-production and prototyping. It produces such small products as bottle tops, sinks plugs, children’s toys, containers, model kits, disposable razors and parts of cameras. The process can even mould such large items as dingy hulls and kit car body shell parts.

What to know more about injection molding? Please go to
https://en.wikipedia.org/wiki/Injection_molding to take a look.