Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Molded parts can shrink after they come out of the mold as the polymer cools. The best gates, or openings, for molten plastic to enter the mold are hot runner molds, full-round runners, or modified trapezoid runners. Proper positioning of the gate, or mold opening, and proper mold design can minimize flaws.

Orientation of reinforcing fibers within injection molded components also significantly influences composite strength.   Fiber length attrition can occur from shear in the injection molding press or from tight runner radii and improper gating in the mold. As reinforcements align in the direction of polymer flow as molds fill, this can lead to anisotropic properties.

Antimicrobial additives work to resist, inhibit and prevent the growth of microbes including bacteria and mold. Because the toothbrushes were molded in both clear and opaque resins, the team had to explore two different avenues—one that preserved clarity and one that retained opacity. Coupled with their ability to be used across a variety of different resins, These antimicrobial additives provided significant value while protecting against microbial degradation, mold and mildew.

HVAC doors are typically produced by injection molding two parts that provide structural strength and air sealing performance. In addition to the lighter weight requirement, the material needed to resist warpage after molding, a common issue for thin walled plastic parts. This formulation provided both the processability required for extremely short cycle injection-compression molding, as well as including an additive to stabilize the material when in contact with copper.