Here’s How Melt and Mold Temperatures Affect Plastic Injection Molding Development

a plastic injection molding shop

During injection molding development, the right melt and mold temperature should ensure your part complies with the requirements. It’s important to learn more about melt and mold temperatures as they’ll help you identify how these two works together. This way, you’ll not just create a better part each time but will also save a lot of money. Of course, you should use the right injection machine too – this will help you reduce your energy usage while getting the right amount.

Here’s how melt and mold temperatures affect plastic injection molding development.

Mold temperature

During injection molding, inappropriate molding temperature can cause defects like jetting, sink marks, and mold warpage.

Based on the type of resin used, mold temperature may end up impacting properties like dimensional stability, molecular weight, wear resistance, fatigue resistance, creep resistance, and molded-in stress.

There are two issues with mold temperature:

§     Mold temperature non-uniform to part cavity proximity

§     Mold temperature isn’t consistent

How mold temperature affects a part?

Parts molded in polycarbonate have a higher molded temperature, and therefore, lower levels of molded-in stress. This results in better resistance to fatigue, impact, and stress cracking.

Melt temperature

Melt temperature should be monitored carefully during the process of molding because resin properties (and temperature) can change during the process.

Based on the kind of resin used, melt temperature can impact properties in a variety of ways like:

§  Resin’s final molecular weight in the molded part

§   

custom plastic injection molding

Resin viscosity

During the determination of melt temperature, you should consider the final property requirements, mechanical work imparted to the material, screw and barrel design, residence time, and engineered resin chosen.

There are two issues with melt temperature:

§    Melt temperature isn’t homogenous

§    Melt temperature isn’t consistent

How melt temperature affects a part?

When parts molded in polypropylene have a melt temperature of 400F instead of 480F, they’ll consume less energy, have a lesser mold cycle time, and have better impact resistance during the injection molding process.

Get top-quality custom plastic injection molding through PTMS

As the best plastic injection mold maker in China, PTMS has been offering top-quality plastic parts to its customers since 2002. With experienced employees and advanced injection machines, PTMS knows how to control the cost in a reasonable range.

Give them a call for more information on their plastic injection parts!

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