John Bozzelli

John Bozzelli Founder

How to Solve Uneven Clamping

Of the hundreds of variables involved in injection molding, clamping mechanisms and platens often get less attention than they deserve.

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Find the Source of Visual Defects

The appearance of visual defects on parts such as cracking, crazing, grooves, ripples, wave marks, and flaky brittleness often indicates more than an aesthetic problem.

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What to Do About Weak Weld Lines

Weld or knit lines are perhaps the most common and difficult injection molding defect to eliminate.

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Sticking Sprues or Parts? Lots of Possible Causes and Solutions

Material sticking in the mold can be a production killer, whether it is the sprue or the formed part in the cavity.

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Eliminate Blemishes on Cosmetic Parts

Black specks, streaks, or poor color mixing are the most common problems that mar the appearance of cosmetic injection molded parts.

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best practices

How to Stop Flash

Flashing of a part can occur for several reasons—from variations in the process or material to tooling trouble.

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