Know-How
Tracing the History of Polymeric Materials: The Commercialization of Acrylic
We covered the invention of acrylic in our last installment. Here, we discuss its commercial development.
Read More
What to Do About Weak Weld Lines
Weld or knit lines are perhaps the most common and difficult injection molding defect to eliminate.
Read More
Smaller Screws Impose Bigger Challenges
Very small extruder screws work just about like their larger cousins, but some critical differences make them harder to design and machine.
Read More
Are Your Sprue or Parts Sticking? Here Are Some Solutions
When a sprue or part sticks, the result of trying to unstick it is often more scratches or undercuts, making the problem worse and the fix more costly. Here’s how to set up a proper procedure for this sticky wicket.
Read More
How to Estimate and Control Head Pressure
You rightfully worry about melt temperature, but don’t overlook head pressure, because the two are closely linked and will influence line performance.
Read More
Melt Flow Rate Testing–Part 1
Though often criticized, MFR is a very good gauge of the relative average molecular weight of the polymer. Since molecular weight (MW) is the driving force behind performance in polymers, it turns out to be a very useful number.
Read More
The Scoop on Screws
The kind used as fasteners in molds, that is. Here are some design considerations to help you choose and use the right ones.
Read More
Tunnel Gates for Mold Designers, Part 1
Of all the gate types, tunnel gates are the most misunderstood. Here’s what you need to know to choose the best design for your application.
Read More
