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Explaining Cooling Rates in Plastic Injection Molding

by Nice Rapid | Feb 11,2021 | Plastic Injection Molding

Plastic Injection Molding is a manufacturing procedure that is heavily involved in the measurement of temperature. As you can imagine, working with plastic resins that are molten and handled in a liquid state call for cooling at some point. This is to speed up the manufacturing process and to get the injected part done right without losing its properties or its shape.

Managing cooling rates is the last part of a molding cycle. The plastic resins' cooling begins the minute it's pumped into the mold. While it's true that it's still white-hot for enough time to reach all the crevices of the mold, the plastic doesn't cool off on its own fast enough to allow time to do its thing. It's also counterproductive since a naturally cooled mold will a product plagued with issues.

The cooling of the mold is finished when the mold temperature reaches the lowest point. If you leave the product inside the mold for more time than that, it will create problems for the finished product. It would be best if you made sure the mold is promptly emptied, and then you can start over again. The process so far sounds simple, even straightforward, so why it needs precision?

The Problems of Unregulated Temperatures in Plastic Injection Molding Projects

Timing is everything. This is especially true when it comes to plastic injection molding. A poorly calibrated mold temperature will blemish the product you are creating with issues such as warpage, sin marks, stress arks, jetting, creep resistance, increased molecular weight, instability in dimensions, pressure marks, and more. Fatigue resistance is probably the worst of all, meaning your products won't last as long as they are supposed to.

Solving the issues Related to Temperature

A suitable workshop is prepared to deal with these problems. Their hardware can be programmed to monitor, measure, and display the mold's temperature and the material at all times. The machine will also account for the shrinkage when the cooling process takes effect to avoid creating uneven parts. As you can guess, this can only be managed if the machine is calibrated correctly.

The calibration is part of the troubleshooting process that should be carried out before starting a production cycle. For a lot of workshops, the cooling is handled automatically. Even so, the water temperature is the cause of concern since ice-cold water will break the mold. This is just one of the many issues that need to be considered before getting started.

Post cooling inspection is always necessary; the first few pieces will speak volumes for the rest of the production cycle. All resins call for different cooling channels. A workshop with in-depth knowledge of cooling rates will always have a significant success rate with plastic injection molding projects. Mastering this stage leads to optimized production rates and increased business.

If you are on the user end of the spectrum, as a developer, make sure to ask all the questions to your manufacturer of choice. There is a lot to gain with plastic injection molding!

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