In the process of continuous extrusion blow molding, the use of compressed air on products is a common practice. In this way, the heat is removed from the outer part of the mold, although the inner side keeps a higher temperature during the cooling phase.
The need for a fast cooling system in blow molding machines is determined by the fact that the degree gap between outside and inside causes stress to the material; this can lead to significant damage in containers integrity, making them more likely to fail quality tests because of leaks or other issues.
What happens in that case, is that the manufacturer has to thicken the products’ surface and redo the tests; as a consequence, costs become remarkably higher and cycle times extend.
Also, it is important to know that the mold cooling water system on its own is not enough to level the heat in a balanced way from the overall blow mold. When the temperature of the cooling water is raised to prevent drops on the mold surface, this also results in a longer cycle time and less efficient production.
To reduce cycle time, another step is to usually concentrate on assuring that the molds have a good heat dissipation on the extruded parison, which has a temperature of about 200°C or 392 degrees Fahrenheit when it comes out from the plasticizing head.
Also, this solution has some disadvantage, as during the blowing stage the only part of the container which is in contact with the mold surface is the outer side.
To overcome the limitations highlighted, securing adequate heat dissipation, Techne has developed and patented a system that ensures recirculation of the compressed air used during forming of blow-molded bottles and containers.
In this way, heat can be efficiently transferred from the inside to the outside, improving output quality and process performance.
Shorten production times and make cycle time more economically sustainable for your business.
In order to deepen the topic and find out the main advantages to use the fast cooling system in the EBM process, download the brochure below.
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