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Injection Blow Molding: The More Precise Plastics Production
In the production of products in the plastics industry there are two main forms of molding: Extrusion and Injection Blow Molding. Both processes are very similar in nature, but there are subtle differences that make one just a little more desirable than the other, depending of course on what product is intended as the end result. Of the two, a more precise and cost-effective manner of producing quality plastics products such as soda bottles and detergent containers is Injection Blow Molding.
What is Injection Blow Molding?Injection Blow Molding is a pretty simple process in and of itself. First, a device called a blow stem is placed in the injection mold, which is then filled with melted thermoplastic material which surrounds the blow stem. This melted thermoplastic material is known as the “preform”. Next, both the blow stem and preform are placed in the blow molding chamber. At this point compressed air is injected through the blow stem, forcing the preform to expand and eventually take the shape of the mold. The mold is then allowed to cool until it has hardened and is then removed from the mold tray.
Why Injection vs. Extrusion?
There are a few important reasons why Injection Blow Molding is a more cost effective and efficient form of Blow Molding. First, Injection Blow Molding has a speedier production time and higher precision than Extrusion Blow Molding. Naturally this will mean lower cost in the long run due to the increased efficiency in the production process. It is also much easier to control the wall thickness of the product in Injection Blow Molding, another feature lending to its increased precision.
For the production of smaller plastic containers and parts in industries such as the automotive and beverage container industries Injection Blow Molding can provide a much more precise, efficient, and cost-effective method of producing quality plastic products. For these reasons Injection Blow Molding can be considered one of the leading manufacturing processes in many industries today.
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