Advantages and disadvantages of injection molding


One of the most popular methods for mass production of plastic parts is injection molding we will look at the advantages and disadvantages in this article. The so-called thermoplastics, besides being configured as innovative products, in relation to the production through synthetic materials, also have numerous possibilities of use. These polymers can be molded from the action of heat, which softens the material, making it possible to take the form of a mold.

What you may not know is that modeling through plastic injection molding machines has a number of advantages and benefits over plastic processing performed by other methods. Therefore, in order for you to better understand the operation of this equipment, we list the productive advantages of using a plastic injector:

Advantages of plastic injection molding

1. Accuracy:

Plastic injection molding is such a precise method that it can manufacture almost any type of plastic part. There are certain design constraints, but the molds allow the finished product to be very precise.

2. It’s fast:

Speed is perhaps the main reason plastic injection molding is one of the most widely used technologies in the manufacture of plastic products. We can say that the speed of the process depends on the complexity of the mold itself, but generally the cycles of production last between 15 and 30 seconds only.

3. Low operating cost:

Plastic injection molding machines usually work automatically, which keeps operations optimized and production in progress, requiring minimal supervision.

4. Low labor cost:

Plastic injection molding machines usually work automatically, which keeps operations optimized and production in progress, requiring minimal supervision.

5. Sustainable:

With so much attention being given to sustainability these days, it is common for manufacturers to choose processes that benefit the environment and minimize waste. Plastic injection molding is not only an efficient and effective process, but it is also sustainable. This is because only the necessary plastic is used to manufacture the part and possible excesses are ground, recycled and reused in the same manufacturing process or resold to other companies.

6. Flexibility:

In addition to being a precise production process, plastic injection molding is also flexible. This is because it is simple to modify the type of material being produced as well as its color.

7. Ideal for creating sturdy components:

One of the most interesting benefits of plastic injection molders is that we can change the density of liquid plastic during injection, thus reinforcing the final part. It is the ideal process for industries or products where parts need to be resilient.

8. Great workmanship:

In most cases, there is very little or no need to finish the parts. Yes, the surface finish is excellent! Turning to lead number 3, this is another example of how having a plastic injector in your industry generates low labor costs.

9. Performance:

Plastic Injectors are capable of producing two or more different parts at the same time, depending only on the molds manufactured.

10. Widely used process:

Plastic injection molding is one of the most popular industrial production processes in the world. Just look around you will surely see a lot of objects that were probably manufactured through this process.


Disadvantages of injection molding

  • Deformation can be a problem in injection molding because the injection materials have softer flows and more shrinkage. Forcing the material through the sprue, channel, and inlet can guide the material producing non-uniform shrinkage.
  • Filling the pieces with one of the two entrances produces pieces that have dotted lines. These dot lines are the weakest areas in the piece.
  • The amount of scrap in total produced during injection molding will usually be higher than that of compression molding because of the additional scrap created by the sprue and channel. In the past, heat-hardened scrap had to be disposed of in a garbage dump. However, some thermosetting materials are now being successfully recycled.
  • It is not cost effective if producing small quantities of a part.

Source: Sect%204%20Injection%20Molding.pdf

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