The plastic material stretches like the gum and if it gets too thin it ruptures. If you’ve blown a bubble from bubble gum you can understand blow molding. In order to design a blow molded product, you must understand the interaction between the molten plastic parison and the mold. Please obtain the correct design information for your specific project directly from our engineering personnel. The design criteria in this guide may not apply to parts molded from some engineering resins. Most require drying before processing, specially designed extruder screws and specific processing conditions. These resins require special consideration prior to molding. Some of the acronyms include PPO, PC, PETG, ABS, TPE – you get the idea. Many engineering-grade resins can be blow molded. These materials usually form parts matching the principles discussed in this design guide.
One difference is temperature performance with PE performing better at -75 to +160 degrees F and PP performing well from -0 to +170 degrees F. These materials are resistant to most chemicals. PE is currently less expensive but PP tends to be stiffer which sometimes offsets the cost difference. Polyethylene (PE) and polypropylene (PP) are the most popular blow molding resins. Some of the least expensive materials are also the easiest to process. Experience with blow molding grade materials is essential and we have practical molding experience using every blow moldable material Commodity Materials Material selection is a critical aspect of design and should involve serious study of:Īlthough there are thousands of plastic materials available, most won’t meet the needs of your product. (Most finishing steps can be completed in-mold but some involve secondary operations.) The molded plastic part is removed from the mold, separated from excess parison material called flash, and finished.The mold is cooled to set the plastic to the new shape of the mold.Air is blown into the inside of the parison to expand the molten plastic against the mold surface.The mold has two halves that are closed around the molten parison. A mold is used to make the part shape you desire.The first step involves mixing, melting and pushing plastic (extrusion) to form it into a tube called a parison that will be used to make the part.Finishing Blow molding is a simple five-step sequence. Our design assistance is confidential and free.
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This guide focuses on the extrusion blow molding process. No two designs are alike, so the mold and process must be adjusted to optimize each design. The Custom-Pak blow molding design guide provides you with basic design tools for making engineered blow molded parts.
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