Plastic injection molding

Plastic injection molding

Plastic injection molding


The application of plastic injection molding is widely used in the production of plastic parts – from medical equipment to toys. In the aerospace industry and particularly the automotive industry, many parts are made with plastic injection molding. Take a moment to look around you. There’s probably a plastic object nearby. Very likely made by an injection molding machine.

The injection molding industry has seen a number of changes in recent years, including faster time to market. One of the key business strategies for plastic injection molders is to work with tooling partners to decrease lead times.

HOW DOES THE PLASTIC INJECTION MOULDING PROCESS WORK?


The basic manufacturing process of injection molding: plastic is melted in the plastic injection molding machine and then injected into a mold under high pressure. There, the material is cooled, solidified and afterwards released by opening the two halves of the mold. This technique results in a plastic product with a predetermined, fixed form.

To facilitate production, the parts that play a role in the plastic injection moulding process must be carefully designed. The products made by plastic injection molding machines are first designed by an industrial engineer or a designer. Then, a moldmaker creates the mold – usually from steel or aluminum. This toolmaker takes all essential conditions into account: The material that is used for the end product, the features of the product; but also the material of the mold and the properties of the plastic injection molding machine.

IM PROCESS


The process cycle of injection molding itself consists of the following steps:

The mold is placed into the injection molding machine (IMM).

The plastic is fed into the IMM in the form of granules or pellets. The molding machine heats the plastic until it is liquid. The nozzle of the injection molding machine then injects the melted plastic into the mold (injection pressure). The cavity of the mold is now filled with the plastic liquid. This will then cool down to form a solid product. Finally, ejectors push the cooled product out of the machine as a finished part. The injection molding process is complete.

HOW TO SPEED UP PLASTIC INJECTION MOLDING


The cycle time of the plastic injection molding process can be broken down into the injection time, cooling time, and the resetting or changeover time. By reducing any of these times, production cost is lowered. Frequent mold changes allow inventory to be reduced and provide faster response to market requirements. The Quick Mold Change Systems from EAS lower manufacturing cost by reducing changeover time.

HOW TO LOWER COSTS OF INJECTION MOLDING WITH QUICK MOLD CHANGE SYSTEMS


One of the best practices requires a fully automated mold change. Not only will this decrease change over time, but it will also make the manufacturer a lot more flexible in his production quantity.