A Wide Array of Solutions for a Wide Array of Blow Molding Processes

Blow molding is a collective term for the production of hollow bodies such as bottles and containers made ​​of thermoplastic materials. There are several distinct blow molding processes, such as;

  • Extrusion
  • Stretch
  • Injection

Each of these variations on the blow molding process presents its own set of challenges to the processor, and each requires a partner like Chem-Trend to help address those challenges.

In extrusion blow molding (EBM), the parison is captured by closing it into a cooled metal mold. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. After the plastic has cooled sufficiently, the mold is opened and the part is ejected. EBM processes may be either continuous (constant extrusion of the parison) or intermittent.

A continuous or intermittent, tube of hot, pliable plastic material is ejected from a flange tool. The material thickness in the tube is controlled according to the shape of the finished mold. A mandrel then moves from the top or bottom of the tube and the mold then closes to cover the plastic and the mandrel. Compressed air is then forced through the mandrel and into the tube, which is inflated and pressed against the contour of the blow molding tool and subsequently cooled. The plastic is thus given the desired form and becomes solid.

In the stretch blow molding (SBM) process, the plastic is first molded into a "preform" using the injection molding process. These preforms are produced with the necks of the bottles, including threads (the "finish") on one end. These preforms are packaged, and fed later (after cooling) into a reheat stretch blow molding machine.

The process of injection blow molding (IBM) is the least-used of the three blow molding processes. It is typically used to make small medical and single serve bottles in large quantities by having a polymer injection molded onto a core pin; then the core pin is rotated to a blow molding station, the polymer is inflated and cooled.

At Chem-Trend, we not only understand the challenges that blow molding presents, we also recognize the diversity of raw materials and processes utilized. Unique, robust, formulated products have been developed to serve as purging compounds (to see them in action, watch the video), release agents, lubricants, cleaners and protective materials that will meet the needs of the wide variations found within the blow molding processes.

In addition, we realize the impact that these products have both on the efficiency of the process and the quality of the end products. The history of the Lusin® brand within the thermoplastic industry started well over five decades ago, and we draw upon that experience every day as we work to solve production problems faced by our customers around the globe.

To learn more about how the products that we have developed to support thermoplastic processing operations can help you, read our main Purge Compounds, Mold Maintenance Products and Mold Release Agents pages, or contact us directly to speak with one of our experts. If you don’t see your specific application or need mentioned, contact us and we can review your process together and determine a custom solution for you.

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