Why choose injection molding in the First Part?

Injection molding:

It is the injection of molten plastic material under extreme pressure into a mold cavity. The material is then allowed to cool and finally shaped into the desired forms. Injection cycle intervals range from a few seconds to two minutes or more. It depends upon the size, design, complexity, and material of the parts.

Injection Molding in First Part:

At First Part, we produce high volume and low-quality injection molded parts professionally. Our professional, and experienced engineers make rich quality plastic molded parts for defense, medical, aerospace, and automotive.

Plastic injection process in the First Part:

We consider the following steps for plastic injection molding.

1.Material preparation






1.Material Preparation:

Dry plastic pellets mingle with color additives or fillers.


In the barrel, the pellets undergo a heating process for melting. It also warms the mold cavity.


The heated mold or die cavity is filled with molten liquid or resin through an opening called a gate. The molten material, after filling into the cavity, converts into the mold shape.


The molten material in the mold and the mold itself can be cooled to take a solid form.


The cooled and solidified material is brought out into the loading cabin through the gate of the mold cavity. Ejector removes from the mold cavity, and a new injection molding cycle can be started now.

Types of injection molding in the First Part:

Many types of injection molding are performed in the First Part. But we are going to discuss only two of them.

1) Over molding

2) Insert molding

1) Over molding:

It is also known as two-shot molding, and this process helps to wrap an injection mold over another material like metal. It increases the duration of the product. A thermoplastic elastomer is the most commonly used material for over-molding. It is used to manufacture various substances such as grip handle of the toothbrushes, grips of the hammers, and rubber grips over steel steering wheels of the vehicles. It is also used for sealing the injection mold product parts.

2) Insert molding:

This method is similar to over-molding and blends two or more components into a final product. In this process, the injection mold component is poured into the mold cavity, and molten plastic material is filled around the inserted part. Inserted material provides extra strength to the product and reduces the unnecessary mass of the product.

6 Reasons of Why to Choose Injection Molding:

The following are the reasons to choose injection molding.

1.Greater Efficiency

2.Complicated designs of the parts

3.Increased strength

4.The pliability in material and colors

5.Reduced waste material


1. Greater Efficiency:

Plastic injection molding is one of the most popular techniques for molding due to its rapid turnaround and efficient performance, unlike other conventional methods of molding. The rate of production of the parts depends on their magnitude and complexity.

This method is capable of producing a bulk quantity of the products within a minimal short period. Consequently, it causes to generate maximum revenue with exceptional profits.

2.Complicated Designs of the Parts:

Injection molding can make millions of identical parts of complicated patterns. The critical design should be kept in mind for maximum accuracy and quality of the details. It should be advanced enough to handle high-volume production with zero faults in the manufactured parts. A suitable design helps to make parts continuously. Otherwise, serious demerits can occur in the details if neglected.

According to the experts, wall thickness, rib design, boss design, weld line, and gate placement are the essential factors that lead to efficient work.

In injection molding, the above factors are considered to ensure zero demerits in the intricate designs.

3.Increased Strength:

The most important factor that ensures the maximum durability of the part is its strength. Designers know very well about the part, whether it should be elastic or stiff. They adjust various parameters to enhance the resilience of the manufactures part. Choosing the right material plays a vital role in the strength of the details.

In injection molding, professionals keep the importance of strength in their minds and manufacture the parts accordingly.

4.The Pliability in Material and Colors:

It is very important to select the right color and material for the parts that you want to manufacture. A large number of polymers help us to choose the right material and color due to the vast applications of resins and their varieties. But it is essential to consult a professional molder while selecting resins.

Impact strength, tensile strength, modulus of elasticity, heat deflection, and water absorption are the factors that ensure the right selection of resins for your project.

Various coloring systems having matchless properties, advantages, and disadvantages from each other, are used for coloring plastics. The most popular coloring methods are Masterbatches, ‘Salt and Pepper’ blends, and Liquid color.

5.Reduced Waste Material:

During injection molding, a large amount of waste plastic is produced. To recycle this excessive amount of plastic, many environment-friendly injection molding companies having green manufacturing measures use advanced machinery to eliminate the waste material ensuring economical transportation and packing.


Injection molding relatively requires low expenditures as compared to other methods. This technique is capable of producing a large volume of parts with minimal labor costs with high-efficiency. The reason is that the molding machinery is directed automatically to make the product parts. Consequently, it eliminates the necessity of specific management to oversight the ongoing operations.