High-Density Polyethylene can be molded into a variety of different shapes and sizes. With its linear structure and optimal strength, HDPE can withstand environmental stresses such as high-temperature treatment and physical impact.

Deciding between plastic extrusion vs. injection molding can be a challenging choice for product designers. It’s up to the manufacturer to understand the intricacies of each process to help their clients make informed decisions. It’s important to note that both methods have their advantages and are valuable in the world of plastic manufacturing.

The extrusion process is ideal for end products that need a smooth finish, like industrial piping. It can also be used to create complex cross-sections such as tubing found in many medical devices and food processing applications. Products commonly formed using the plastic extrusion method include:

HDPE molded parts are a staple in many industrial applications – from idler pulleys to roller chain sprockets, the professionals at Retlaw have the skills to produce thermoplastic HDPE components for your company at the most affordable prices. We have a wide range of plastic types and products to choose from in our Wisconsin facility, and we can accommodate all your HDPE plastic part needs whatever they may be.

The professionals at Retlaw Industries use HDPE for a variety of parts, and we can manufacture any component you need for strength and durability at a low cost. Our plastic injection design, tooling, molding, and assembly services are key contributors to dozens of industries, making us one of the most trusted plastic manufacturing companies in the nation. Make Retlaw Industries your top source for all OEM parts.

The injection molding method begins by feeding plastic pellets into a hopper. The granules are then compressed, and the frictional heat melts the plastic. Next, the meld goes into the injector, which directs the liquid into die cavities. From here, the molten material fills the mold, taking the shape of the mold. Once the material is cooled and solidified, the die is opened, and the specific object is obtained.

The injection molding process is reasonably quick and produces a detailed plastic piece that often does not require additional assembly or processing. Because of this quality, injection molding carries a higher cost than plastic extrusion. The injection molding process is often used to make the following plastic items:

Both extrusion and injection molding are methods of plastic molding. However, they differ in execution. With extrusion, melted plastic is pushed through a die to create a specific shape. The extrusion method is used for two-dimensional objects.

Unlike plastic extrusion, injection molding can be used to form three-dimensional shapes. With this method, manufacturers inject plastic resin into a mold where it settles and cools into the desired shape.

First, plastic granules are placed into the feeder, where they are melted into a thick liquid. From the feeder, the meld will be pushed through the die opening and extruded from the end. Once it is cooled, the product will be in the desired shape. From here, manufacturers can cut the plastic piece into different lengths.

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HDPE is a versatile plastic with notable strength, flexibility, and resistance to chemicals and abrasion, making it an ideal choice for a wide range of applications. HDPE is used by people every single day, and you might not even realize it. Its ideal properties, specifically for packaging and assembly, make it one of the most widely used plastics in the world. It is also extremely versatile and can be used for manufacturing plastic milk jugs, auto parts, pipes, and much more.

HDPE is a plastic in high demand nowadays. Retlaw Industries has the resources and expertise to deliver exceptional HDPE molds, parts, and components nationwide. Nationwide shipping is always available including to Wisconsin, Washington, Pennsylvania, Ohio, New York, Minnesota, Michigan, Indiana, Illinois, and Colorado.

Injection molding is based on the molten die casting method, which means a thick liquid called melt is injected into a mold to form the desired object.

HDPE is a thermoplastic polymer made from petroleum commonly used for plastic injection molding, HDPE was first created in the 1930s in the UK and used in radar cables during WWII. After it was commercially introduced in the U.S., its popularity took off and continues to be used today for a wide variety of industrial and commercial applications.

Now that we’ve clarified the key difference between extrusion and injection molding, we can take a more in-depth look at the extrusion process.

Choose Retlaw Industries for custom HDPE parts manufacturing and benefit from our transparent pricing, extensive shop capabilities, and commitment to customer satisfaction. With over 40 years of experience and a long track record of success, trust Retlaw Industries for the manufacturing of high-quality HDPE parts and components your business needs to succeed.

Also known as polyethylene high-density (PEHD), HDPE is a polyethylene thermoplastic made from petroleum. Its high strength-to-density composition and versatility make HDPE a very popular type of plastic, serving a wide array of industries. From food storage containers to piping systems, HDPE does it all.

Within the realm of plastic processing, there are several methods of manufacturing. Two of the most popular processes include extrusion and injection molding. While they produce similar results, they use different equipment and techniques. Whether you are forming plastic pieces for commercial, industrial, or medical use, the manufacturing method you use will vary. Here are the important differences between plastic extrusion and injection molding.