OEM Injection Over-Molding Supplier China 2022

March 12, 2022

OEM injection over-molding supplier is widely common in the industry. To transform and shape this material, there are a variety of techniques common.

OEM Injection Over-Molding Supplier

Thermoplastic injection and rotational molding

Both methods have their specific advantages and characteristics. In today’s text, we differentiate between the two techniques.

Thermoplastic injection x rotational molding

The thermoplastic injection consists of molding polymer granules in order to generate a plastic part. The objects created in this technique can have the most diverse shapes and dimensions. They also tend to have a constant thickness, facilitating the production of fitting pieces.

The process takes place in an OEM injection over-molding supplier with two phases, one for closing and one for injection.

  • In the first phase, the solid-state material melts until it becomes a unit.
  • In the second phase, the melted plastic injects into a mold in the desired shape to create the part.

It then undergoes cooling, which causes it to solidify. Thus, it gives rise to the fixed format of the final object.

Rotational molding

Rotational molding, also called rotational molding or rotational casting, is a process of molding plastic parts and transforming thermoplastics. Simple and low cost, it generates hollow or open pieces of greater or lesser dimension.

There are four stages that constitute the operation of OEM injection over-molding supplier.

The first is the dosage of the resin, which places in the mold. Then heating and rotation take place. It then passes through the cooling of the obtained part, followed by the demolding, in order to originate the final object.

Advantages and disadvantages of each process

Both thermoplastic injection and rotational molding allow a wide range of modeling. It is possible to produce parts of different shapes, colors, and dimensions with low residual stress.

On the other hand, rotational molding production time can be a disadvantage, since the molding and demolding processes are manual. Parts are exposed to high temperatures for a long time, which increases the risk of thermal degradation.

The possibility of creating parts aimed at meeting a specific need

The OEM injection over-molding supplier allows the creation of parts with great precision, while those produced by rotational molding have less exact dimensions.

As for large-scale production, injection is the most suitable for the process. After all, it is possible to produce a large number of parts in a short time. Therefore, compared to rotational molding, it is more economically advantageous.

The differences between the rotational molding and thermoplastic injection

The differences between the rotational molding and thermoplastic injection are subtle, but each of these processes is best suited to a situation. When choosing, it is important to analyze which one is most suitable for each need.

Keep following our blog for more information and tips about OEM injection over-molding suppliers.

In the plastics industry, one of the most common transformation methods is thermoplastic injection. But it is not the only one. There is also the use of vacuum forming, or vacuum thermoforming.

Below we explain what this process is and its differences from injection molding machines.

What is vacuum forming?

Vacuum forming is a polymer transformation process that has been gaining ground due to its versatility and low cost.

The process consists of the controlled heating of the polymers until they reach the appropriate temperature for the shape of the mold common.

This mold can be either positive (concave) or negative (convex)

OEM injection over-molding supplier use is for the production of parts, packaging, and wrappings and stands out for its quality and good productivity. Vacuum thermoforming does not require large industrial facilities and is easy to create molds.

Vacuum thermoforming x thermoplastic injection

Although it is a process with good advantages, thermoforming cannot be considered a substitute for injection molding machines. This is because there are some parts that can only be achieved through the use of an OEM injection over-molding supplier. Such as those that have small details or those that have a high degree of complexity.

In these cases, vacuum forming proves to be insufficient and unable to produce the same results. On the other hand, the method is excellent for prototyping and small-scale immediate production.

There is another way of deciding on which process to use is also the purpose of producing the part.

OEM injection over-molding supplier is excellent for producing parts

When looking for a supplier for your plastic parts, research your goal and the ideal method for your production. Thus, your demands will be met with assertiveness, considering your needs and choosing the process that best suits you.

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Today the injection of thermoplastics is one of the most common production processes in the manufacture of goods from different sectors. Just look around us and we can quickly realize that polymers are present in almost everything.

To make this possible, OEM injection over-molding supplier relies on different techniques that allow materials to meet different needs.

What are thermoplastic additives?

Additives for thermoplastics are chemical substances added to polymers at the time of transformation. Each of these additives will react in a different way, causing the material to gain new characteristics.

As such, they are vitally important to the enormous diversity of needs that the plastics industry is able to meet. To better understand how they work, below we separate, as an example, some widely common additives for thermoplastics.

Expanding agent

The blowing agent is common to OEM injection over-molding suppliers in expanded form, such as foam or Styrofoam. The expansion is possible thanks to the formation of gas that occurs when the incorporated additive decomposes during the heating phase.

Usually, the additive appears in powder form, and a good distribution of it is essential for good results.

Flow agent

When softened, polymers have a high viscosity that makes it difficult to fill channels and matrices. Without the application of flow agents, damage to the molding process can occur, in addition to stressing the machine to the maximum, which can cause a failure or breakage.


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