John Bozzelli Founder

scientific molding 22 Feb 2015

INJECTION MOLDING: The Trouble with Mismatched Nozzle Tips & Sprue Bushings

It happens more than most molders realize and can cause a host of molding problems. Here’s what to look for and how to fix it.

scientific molding 27 Jan 2015

INJECTION: First to Second Stage Transfer: Should There Be ‘Bounce-Back’?

How much screw ‘jumping’ or bounce-back can your process tolerate? The answer is no surprise: It depends

Injection Molding 29 Dec 2014

INJECTION MOLDING: Another Way to Deal with Regrind

You can run into a lot of problems molding parts from a blend of regrind and virgin material. Might you be better off using 100% regrind?

scientific molding 24 Nov 2014

High-Pressure Water: A New Concept for Screw Cleaning

Everyone in a molding plant is on the same page for screw cleaning: Avoid pulling it until there is no alternative. Here are ways for dealing with the inevitable, including an altogether new technique.

Injection Know How 23 Oct 2014

INJECTION MOLDING: How to Tell If Your Non-Return Valve Is Leaking

Check valves are potentially troublesome devices. Here’s how to find out if yours is behaving properly.

Injection Molding 22 Sep 2014

INJECTION MOLDING: How Does Your Machine Control Pack Velocity?

You’ll need to find out in order to develop a molding process that you can repeat from machine to machine and mold to mold.

scientific molding 18 Jul 2022

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.

best practices 19 Jun 2014

INJECTION MOLDING: Setting Mold Protection Takes Time But Saves More

Mold protection is often neglected, but it more than pays for the time and attention required.

Injection Molding 21 May 2014

INJECTION MOLDING: Troubleshooting Bridging

Bridging is an aggravating problem that can shut you down. Here's how to find it and fix it.

Drying 24 Apr 2014

Bozzelli’s Dozen Drying Tips

There’s a lot to know about drying—enough to fill a book, at least. But for now, here are a dozen details you need to know, from seasoned injection molding consultant and Scientific Molding trainer John Bozzelli. Scroll down and take his quiz.