...

How do you calculate injection capacity ?

Table of Contents

Injection molding is an essential step in creating precision molded parts, and calculating the necessary injection capacity helps save time and money by ensuring you use only what’s needed.

Through careful calculation of size, shape, machine types and more – coupled with tips to optimize the process along the way – this article will provide readers a foolproof plan for successful injection molding projects.

Determine the volume of the part to be molded

Before calculating injection capacity, the crucial starting point is to use CAD software or manual measurements to pinpoint both volume and melt densities of the part being molded.

It’s critical for accuracy here – any difference in these values can drastically change the results! As an example, we see from Picture that a total volume of 49018.2193 cubic centimeters was determined.

Determine the material density

To ensure accuracy in the injection molding process, it is essential to determine the density of a material before introducing it into the machine.

The specific volume or weight-to-volume ratio can be found on the accompanying data sheet for each material; however if needed, this information may also be obtained through consultation with vendors.

For example when choosing ABS plastic as our selected product (as shown in Picture 2), we knew that its room temperature density was equal to 1.06g/cm³ – an important detail necessary for successful production!

MaterialsNominalDensity
Polystyrene PS1.05
Medium high impact of polystyrene HI-PS1.05
Polystyrene acrylic crystal S1.08
Acrylobutadiene styrene ABS1.06
Styrene-acrylic acid ASA1.07
Low-Density Polyethylene LDPE0.954
High Density Polyethylene HDPE0.92
Polypropylene PP0.915

Calculate the injection capacity

Once the details of a part’s size and material are determined, it is possible to calculate how much must be injected into an injection barrel.

By using a simple formula – volume divided by density – you can accurately determine this capacity in grams.

For example, given that a specific component measures out to 49018 cm³ with 1.06g/cm^3 as its material density would require 384g for sufficient injection molding through an injector barrel.

Choose the right injection molding machine

Theoretical injection capacity = (injection molding machine) barrel cross-sectional area × screw stroke.

Injection weight = injection capacity × melt density of raw materials × injection efficiency.

coefficient, a theoretical injection shot weight≤80% of ABS theoretical injection capacity.

So, the right injection capacity of the injection molding machine=384/80%≥480g.

Determine the injection pressure and speed

During injection molding, the pressure and speed used to inject liquid material into a die have an immense influence on the quality of the final product.

To determine these values it is essential to consult with experienced professionals who can provide guidance or conduct tests in a controlled environment.

By taking this extra step during production you can ensure that your finished parts will be accurate and consistent every time!

Consider the cooling time

Another important conversion factor to consider when calculating injection capacity is the cooling cycle time of the material. 

Different materials have different cooling times, and it is important to ensure that the material has enough time to cool and solidify before the mold is opened. 

If the material is not given sufficient cooling residence time, it can result in defects or other issues with the injection molded parts.

Optimize the injection molding process

For a smoother, more efficient injection molding process with less waste and lower costs, look no further than smaller machines paired with higher-quality materials.

By taking these steps to reduce shrink rate and defects in the output parts during manufacturing, you’ll have greater accuracy across products while still saving on resources used.

Conclusion

Calculating injection capacity is an essential element of successful injection molding. By carefully optimizing the process and considering a variety of factors such as shot size, machine type, pressure levels and cooling time you can ensure that your parts have superior quality while remaining cost-effective in production. In short – getting it right first time means better results!

Latest Posts
Share on facebook
Facebook
Share on twitter
Twitter
Share on linkedin
LinkedIn
Share on pinterest
Pinterest
Tell us your request right now and contact us today about getting started on your next project together!

Email: info@zetarmold.com

Or Fill Out The Contact Form Below:

Спросите быструю цитату

Мы свяжемся с вами в течение одного рабочего дня, обратите внимание на письмо с суффиксом «xx@zetarmold.com».

Ask For A Quick Quote

Send drawings and detailed requirements via 

Emial:inquiry@zetarmold.com

Or Fill Out The Contact Form Below:

Ask For A Quick Quote

Send drawings and detailed requirements via 

Emial:inquiry@zetarmold.com

Or Fill Out The Contact Form Below:

Ask For A Quick Quote

Send drawings and detailed requirements via 

Emial:inquiry@zetarmold.com

Or Fill Out The Contact Form Below: