Injection Mold Design Guide -

: Apply a minimum of 0.5° on all vertical faces.

: Use Sans Serif fonts (like Arial, Verdana, or Century Gothic Bold). These fonts have uniform thickness and lack "serifs" (small decorative tails), which are difficult to machine and can cause material flow issues.

As molten plastic fills the mold, it displaces trapped air and gases. Inadequate venting leads to short shots, burn marks (diesel effect), and poor weld line strength. Vent Dimensions

Once the part cools and solidifies, the mold opens, and the mechanical ejection system pushes the part off the core. injection mold design guide

Injection molding is the backbone of modern plastic manufacturing, capable of producing intricate, high-volume parts with exceptional accuracy. However, the success of a molded part is largely decided before production ever begins—in the phase. A well-designed tool minimizes defects, reduces cycle times, and lowers overall manufacturing costs.

Essential when molding corrosive resins like PVC, or when a high-gloss, mirror-like optical polish is required on the final part.

Increase draft to 3 to 5 degrees or more for textured surfaces to prevent scuffing. Radii and Fillets : Apply a minimum of 0

: Enforce uniform wall thickness throughout the part and add structural cooling lines closer to the thicker areas of the mold tool. Knit Lines (Weld Lines)

The following are the key components of an injection mold:

Ribs add structural stiffness without increasing wall thickness. Bosses create mechanical fastening points. As molten plastic fills the mold, it displaces

General-purpose tool steel that can be polished or heat-treated, offering better corrosion resistance than P20. H13 is ideal for high-volume production and abrasive resins like glass-filled nylon.

Runners are channels that route the plastic across the mold plate.