07 Oct 2020

A Guide to Plastic Molding – Manufacturing and Process.   Plastic molding generally refers to plastic injection molding. This process is used to create plastic parts by injecting molten plastic into a metallic mold. After the plastic cools, the mold is opened, and the newly formed plastic part is released.    Common uses of plastic […]

  Get the custom injection mold you need   Rex Plastics can create custom, high-quality injection molds for nearly any application. These molds allow clients to create custom plastic parts at scale, for the lowest possible cost per unit. For more information about the cost of injection molded parts, check out our blog. From toys […]

05 Apr 2021
Woman operating an injection molding machine

What is a sprue? A sprue is a channel through which molten plastic flows into the mold. Specifically, the sprue is the entry point of the molten plastic, the vertical passage which plastic then flows through into runners and gates. In general, the entire assembly is commonly known as the sprue. The whole system is […]

When creating a product or part using injection molding, it’s easy to get caught up in that piece’s actual production. Things like material, size, and complexity are all important factors to consider and have a huge impact on production. But what about the look and feel of your product? If your product or part is […]

07 Aug 2020
colorful samples of plastic materials

Plastic injection molding can use many different types of plastic. The most common are polypropylene, polyethylene, PVC, and acrylonitrile butadiene styrene (ABS). These materials are durable and affordable, making them well suited for a number of different applications.    Materials Used for Injection Molding   When choosing a material for your project, it’s important to […]

06 Jul 2020

What is Insert Molding?   Insert molding is the process of injecting plastic around an object, usually metal. This creates a single piece using two or more materials. Common inserts include things like metal pins and threaded rods.   Why use insert molding?   Insert molding is widely used in manufacturing today because it allows […]

13 Feb 2020
The metal plates of a plastic injection mold

The plastic injection molding process The basics of the plastic injection molding process: melted plastic injects into a metal mold. The plastic material cools inside the mold and hardens into the finished product. The product releases when the two halves of the mold separate and the plastic ejects.  How does injection molding work? Put simply, […]

10 Dec 2019

What is an Overmold?   Overmolding uses two or more different materials to create a single product. For example, overmolding can create a plastic toothbrush with a soft, comfortable handle. The central, usually harder piece, is called the substrate, while the outer material is known as the overmold material.   When creating an overmolded piece, […]

25 Nov 2019

Is 3D printing cheaper than injection molding?   Injection molding is cheaper than 3D printing if you produce more than 100 parts. While the cost per unit using 3D printing stays relatively unchanged, the price for injection molding becomes dramatically better the more pieces you manufacture with your mold. There are, however, many factors that […]