John Bozzelli Founder

scientific molding 28 Nov 2011

What Percentage of Barrel Capacity Should Your Shot Size Be?

The answer combines both experience and science, and it may be one of those molding details that gets overlooked but could be stealing a chunk of your profits.

Injection Molding 25 Oct 2011

Plasticating Rates: Your Profits Are at Stake

To get the best cycle time you need the right machine, and few molders take the time to specify this critical component of the process.

Injection Molding 30 Sep 2011

Calculate Shot Size Vs. Barrel Capacity

It may seem like a dull topic, but it will overcome the emotional experience that follows when you put a new mold into a machine and you find out there is not enough barrel capacity to make a full shot.

processing tips 23 Aug 2011

Short Shots Redux

Deliberately making a short shot permits you to do a scientific molding viscosity curve. It will also prevent you from damaging the mold by overpacking if you set shot size incorrectly.

Injection Molding 27 Jun 2011

Mold Filling Simulation: What, When, Why, How

Mold-filling analysis is the right direction to go, but if you want to arrive at your destination—good parts and an efficient process—you’ll need to pay attention to all the details and select an experienced professional to do the analysis.

processing tips 31 May 2011

Screws and Pellets: One Size Does Not Fit All

Screw design, pellet type/size and material behavior are all critical issues to consider to deliver uniform melt to the mold.

best practices 25 Apr 2011

Feed-Throat Temperature Control

It's the 'zone zero’ for injection molding.

Injection Molding 26 Mar 2011

Why Non-Return Valves Leak

We all recognize that the non-return valve is a problem. The question is where is the research to figure out how to correct this so we have a better shot at making more consistent parts

Purging Compounds 23 Feb 2011