How to Choose the Right Plastic Injection Molding Machine ‍

The plastics manufacturing industry is one of the most capital-intensive industries around. That’s because it requires a large amount of machinery, as well as a lot of space and utilities to keep it operating. Additionally, the high cost of raw materials makes it cost-prohibitive for most small companies and startups to get started.

However, with the right know-how, a small business can start manufacturing plastic goods without breaking the bank or hogging resources. Though investing in an industrial grade machine can be pricey, they’re worth every cent if you plan to remain in operation for years to come and grow your company at the same time. So what do you need to know before choosing a plastic injection molding machine (เครื่องฉีดพลาสติกขึ้นรูป, this is the term in Thai)?

What to look for in a plastic injection molding machine

Know the specific features you’re looking for in a new machine. Knowing what you want in a machine will help you narrow down the options to find the best one for you. You can also use this guide to help you decide if plastic injection molding is the right choice for your business. The most important features to look for in a machine are the following:

– Capability – The best way to determine how much a machine can produce is to measure it. So, be sure to get a machine with the capacity you need to run at peak production.

– Ease of Operation – Injection molding machines can be complex, so it’s important that they are not too complicated to operate. Your production personnel should be able to get the machine running quickly.

– Reliability – Is your due date and a good amount of time before you have to come back and repair the machine. If there are issues, you want to be able to get them fixed quickly.

What is rotational molding?

Rotational molding is the process of spinning a polymer around a rotating spindle to shear, or break up, the polymer molecules and make a three-dimensional object, or part. There are many different ways to rotate a machine to make this happen, but all of them are capable of producing the same end result, which is a shaped piece of plastic.

What is hot injection molding?

Hot injection molding is a form of rotational molding that starts with a batch of molten polymer. Then, a die, or mold, is placed over the spindle, and the mold is pressed down so that the polymer goes into the mold and cools. The next step is to open up the mold and remove the part. Then, a heated injection nozzle forces the polymer through a heated nozzle into a cavity and onto a rotating die, creating the final product.

While some plastics are ready to be injection molded right out of a polymer reactor, most plastics are run through a process known as extrusion. These machines use two spindle speeds. One set of spindles moves the workpiece around while the other moves the die to cut the workpiece. The polymer then goes through a cooling process before it is ejected from the machine and collected for recycling.


Plastic injection molding machines are expensive, but they can produce high-quality, long-lasting parts. Plastics can be produced in a series of one or more parts, and injection molding machines are the best method for making these types of parts.