Tag Archives: plastic

Prototype? Cast Urethane is Ideal

Injection molding is great for high volumes, but when it comes to small runs, what you really need is a cast urethane process. That's what makes it ideal for prototypes. Cast urethane processes are fast and cost-effective so whether it's the medical equipment industry or robotics, a durable plastic component can be made quickly at a...
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Altering Cast Polyurethane

  While casting provides the products you need, sometimes secondary machining activities are required in order to get the polyurethane elements into just the right place and in the right working order. Hard urethanes (90 Shore A and up) are fairly easy to machine.   The key is to rely on a plastics expert who understands the machinability...
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What is Profile Extrusion?

  Harkness Industries produces several resins suitable for profile extrusion. The extrusion process for profiles is similar to sheet extrusion. The resin is fed into an extruder which melts the material and forces it through a die that gives it the desired shape. Additional processing is necessary to give the extruded profile its final contours. Profiles may...
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Harkness February News Update

We hope your February is off to a great start. We have a few exciting updates to bring you this month, so let's get to it! First, we would like to welcome Tim Emerson to the team as our Controller. Tim brings with him experience in strategic planning, operations management, as well as financial analysis and...
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Three Advancements That Have Driven Injection Molding Technology

Injection molding technology has made major advances in the last 25 years, from largely a world of shoot-and-ship to doing as much as possible at the press — using automation to remove parts and assemble them, two-shot molding, even assembling parts inside the mold. Now instead of a big inspection department, constantly pulling parts off the...
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The Pros and Cons of Cold vs. Hot Runner Molds

Every plastic part starts in a mold.   Molds are classified into two main types, cold runner and hot runner.  Each has its advantages and disadvantages.   Your plastic injection molder will be able to give you the costs and benefits of using these different systems.  However, by understanding the key differences of these technologies, you...
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The Harkness Standard For Urethane Shapes

Harkness Industries’ cast urethane shapes (sheet, tube, rod and bar) are well known for their extraordinary toughness, durability, and consistent quality. Our MP Series product line will improve service life by 10 to 20 times versus that of conventional rubbers and plastics. In the toughest abrasion environments, urethanes will outlast hardened steel by...
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The Advantages of Custom Injection Molding

The injection molding process has several advantages over other molding processes. It allows for the fast production of plastic parts with reduced waste and at low cost. The following is a short list of what you can expect from utilizing Injection Molding as your form of production.
  • Injection molding allows for high production output...
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Rethinking Mass Production: How 3D Printing Is Changing Manufacturing

How can 3D printing help change the way we think about mass production and injection molding? How is helping change the way we think about prototyping and creating new ideas? Here we look at the basic tenets of mass production and how technology is changing the marketplace. It’s a basic tenet of mass production: Making things...
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Why Does Colour Vary in Natural Polyurethanes?

Natural polyurethanes vary from a light tan (almost yellow) to a medium-dark amber (almost greenish). This variation is noticed from supplier to supplier, and even within a given supplier’s production. Black or other colored (pigmented) polyurethanes do not typically exhibit this variability in color. It is important to note that these color variations...

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