Category Archives

An frequent e-mailer recently asked this question… JM What is the downside to a worn screw?  Why should I measure it, and why should I replace it if it is worn beyond tolerance? My Response Each process and company has a different tolerance for wear. A company molding medical devices needs much more control over melting and […]

I received a question which relates to an issue that many injection molders face… MJ Is there a technique for optimizing recovery speed? My Response Basically, there is a way to optimize recovery speed… but it is a two step process: 1) First, determine the optimal feed zone temperature for your process by performing a feed zone temperature […]

I got a multi-part question the other day regarding a couple aspects of mold clamping… Rob Do you have a suggested torque specification for 5/8-11 and 3/4-10 bolts? I know you are suppose to refer to the manufacturers torque specification, but does that apply to a clamp bolt and clamp? The clamp is a lever […]

Yesterday, I received this question from a frequent blog contributor… Milan What is the difference between molded-in compressive stresses and molded-in orientation stresses? My Response I will first define the two concepts in practical terms, and then address the differences between the two… Molded-In Compressive Stress – As the polymer fills the mold and cools, the polymer begins […]

I just got this quick question from one of our blog readers… Larry We have a small nozzle mold (0.2oz of Lexan PC) that traps air, but we can’t seem to find a way to vent it. The only success we have had is to reduce the clamp tonnage. Can you briefly state a procedure for […]