Polymers are compressible, so there are many ways to increase density of your molded part. This is especially true for semi-crystalline polymers. Question: Our customer is complaining our product density is lower than other suppliers based on a 3D CT SCAN inspection of our product. How do we increase the density of the PA66+30%GF product. My […]
Category Archives
Plastics Technology
Fixing Mold Sweat…
In a non-climate controlled environment, cold molds will often ‘sweat’ on humid days due to the mold surface temperature being lower than the dewpoint of the surrounding air. Question: We have to warm up our molds during the summer to keep the molds from sweating. This results in much longer cooling times. Management will not […]
Molding PVC With a Cushion…
The basics of scientific molding is the same whether you are molding CPVC or PP as it is with large parts vs. small parts. Essentially, the difference between is in the range and scale of parameters and not the scientific approach. Question: Isn’t it dangerous to mold PVC with a cushion since the extra material […]
Using Standardized Ejector Rods…
With the right mold preparation, you can use one set of ejector rods in every machine. One this is done, you can keep the rods in the machine and use the same ejection retract position for all your molds. Issue: Most of your molds use ejector rods to push the ejection system and you always […]
Temp, Time, & Part Dimensions…
A cooler mold tends to provide larger part dimensions, but this can often be offset by a reduction in cooling time. It is generally worth the effort to perform a quick DOE to verify. Concern: During an on-site training session, we were discussing how a cooler mold typically provides the best potential for a lower […]