Injection Mold Design Guide -

The gate is the narrow entrance where plastic enters the cavity. Choosing the right gate type prevents cosmetic blemishes and controls part packing. Parting Line Simple to machine; excellent flow control Leaves a visual vestige; requires manual trimming Sub (Tunnel) Gate Below Parting Line Automatically shears off during ejection Can cause high shear stress; limited to smaller parts Pin Gate Top/Face of Part Automatic degating; ideal for multi-cavity Leaves a small pimple on cosmetic surfaces Tab Gate Side of Part Reduces shear stress; prevents jetting Large vestige; requires secondary removal 5. Parting Lines, Shut-Offs, and Undercuts The Parting Line The parting line is where the two halves of the mold split. Whenever possible, place the parting line on a flat plane.

: Required for complex, curved geometries. These must be balanced with interlocking features to prevent side-shifting under high injection pressures. 3. Feed Systems: Runners, Gates, and Sprues injection mold design guide

Machined into only one side of the mold, these are easier to produce than full round runners while maintaining good flow efficiency. The gate is the narrow entrance where plastic

: Arrange multi-cavity molds symmetrically so that the flow path length from the sprue to every single gate is identical. This ensures all cavities fill at the exact same time and pressure. Parting Lines, Shut-Offs, and Undercuts The Parting Line

: 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.