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Plastic Molding Manufacturer: A Guide to Cooling Rate Process

Plastic Molding Manufacturer: A Guide to Cooling Rate Process

Dec 09, 2020
By hqt

Effectiveness of Cooling Rate Process of Plastic Molding Manufacturer

For a plastic molding manufacturer, lack of proper knowledge about the cooling rate process, makes discussion and problem solving an inefficient and confusing phenomenon.

You probably have no idea about the process if you are still wondering what the cooling rate is. The cooling rate process is the final and pertinent to injection molding. A plastic molding manufacturer, using plastic injection molding manufactures hundreds of products daily. The product remains unfinished unless it comes out of the moldings. Often it happens that molding is very hot.

You May Also Read: 10 Plastic Injection Molding Defects and Their Prevention

 This is because usually the for-plastic production, manufacturers use molten risen. Therefore, the final product needs a temperature cool down before it releases out of the molds. The cooling process finishes when the final product cools down to the lowest possible temperature. Therefore, in technical terms, the cooling rate process is called the decreasing time.

The decreasing time a molten risen take in entering the mold till it fills the whole cavity. However, if you disregard any protocol, the final product will be faulty and of low quality.

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The colling rate process is the speed duration in which the temperature of the molding drops down. It is the final most step in the plastic injection molding manufacturing cycle. The cooling rate in the injection molding process is the middle stage of temperature.

It reaches between the injecting temperature and ejecting temperature. Therefore, it is a stage when a plastic molding manufacturer opens and ejects a final product.

Cooling Rate Systems Used in Plastic Injection Molding Process:

In any given situation, condition, and system of plastic molding, there are two standard systems of cooling. The two systems are thus internationally the only standard system of cooling in plastic manufacturing.

 However, some manufacturers follow their own created systems. Even though, plastic molding manufacturer, take a maximum cue and help from the two standard systems of cooling. The two standard systems are generally successful and time-tested methods of cooling. The systems are:

Air-Cooling Systems:

The air-cooling system is the least common method in the plastic injection molding industry. As the name straightaway suggests that the process uses the air-cooling system. plastic molding manufacturers use cold air to lower down the rising temperature of the molten risen.

 However, this process is expensive as it consumes a large amount of energy in running cold air compressors. Furthermore, the air-cooling system is the slowest of the two-cooling process. It takes more time in cooling the heating mold than the other process.

But this is the most effective method of cooling in the cooling rate process. This is because a slow cool down makes the molding parts more rigid and tuff. Also, this process of cooling is common for manufacturing the most delicate, fragile, and expensive products.

Chemical Cooling Systems:

There is a second system of cooling that plastic molding manufacturers use in the cooling rate process. The name chemical suggests that it is not something basic. Rather it should be something complex and formulated.

However, the chemical cooling system is far from complex. There are two integral ingredients in the chemical cooling system: Water and Ethylene Glycol. The mixture of these two chemicals forms the basis of the chemical cooling material. The manufacturer applies/use the mixture through the multiple hoses in the manufacturing unit.

The hoses strategically cover manufacturing machines. This thus covers most sections of machines and helps it in cooling it. This is the most rapid, popular, and effective method of cooling.

The cooling process in plastic molding injection completes when temperature stops reducing. Also, any additional time, material, and energy after this range seem useless and uneconomical. Some factors may affect the cooling rate process of the final molding parts.

Mold Cavity Pressure:

The plastic molding manufacturer measures the cooling rate of the molding part constantly in a regular manner. They monitor the cooling rate of the molding and measure the changes by reading the pressure curve. The pressure curve displays on the monitor that indicates the temperature changes of the mold.

 When the molding cools to a considerable temperature, it also starts contracting by natural law. The shrink mold thus vacates enough room in the molding cavity. This thus reduces the molding cavity pressure. The reduction in molding cavity pressure thus affects the cooling rate and the final molding product.

Mold Temperature:

The temperature of the molding resin can itself be a pertinent factor that may affect the cooling rate. Either low or high molding temperature can affect the final molding product in many ways. Mold temperature can affect the cooling lines as well as the final product. The effects can be:

  • Mold Warpage
  • Sink Marks on the final product
  • Jetting imprints/ leftovers

Furthermore, the improper temperature of the mold can affect the overall properties of the final product.

  • Sink Marks
  • The stress of the mold
  • The fatigue resistance in molding
  • Wear resistance
  • Creep Resistance in molding
  • The overall molecular weight
  • Stability in terms of dimensions

Other Factors That Affect the Cooling Rate Process:

The logistics also play an important role in the cooling rate process. The logistics that plastic molding manufacturer manages are the greatest ally in the manufacturing unit. One of the logistics is heat. It’s the greatest asset in any project.

Also, it becomes the greatest enemy if you don’t manage it properly. The amateur heating may cause the final product to be imperfect. Furthermore, sometimes the final product may liable to get cracks that reduce the overall worth.

Wear Resistance:

Wear resistance of any molding is surface damage or slow but gradual removal of the surface material. The higher the wear resistance is the more defective and low quality the molding is. one of the most common reasons for high wear resistance is temperature.

 Proper and heating and cooling in amalgamation with proper handling of the mold avoids wearing resistance. After the product cools off, the handler must handle it with great care. With proper handling in proper time, the plastic molding manufacturer avoids wearing resistance.

Non-Heat Metal Conductors:

Even after the product cools down following all the protocols, it needs to be set in. If the molding machine succeeds in making the complex model, it requires time to settle after the cooling rate process.

This becomes a complex phenomenon when manufacturers use non-metal molds. But thanks to the innovation. Metal molds however make the setting-in and cooling process easy and smooth.

You May Also Read: How to Ensure the Quality of Molds for Plastic Injection Molding? 

Final Thoughts on Plastic Molding Manufacturer

After the detailed discussion, we can recommend that manufacturer must select the best cooling channels. The manufacturer can ensure the best possible cooling selection in the design phase of the molds. For a molten plastic risen, in-depth knowledge of the cooling rate process will help in control the temperature.

Better control over the mold temperature will ultimately help in the cooling rate process. The best cooling rate ensures the best production cycle reducing the stress and yielding a better outcome.

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