Injection molding

How should this "small angle" of draft be determined? There's a great deal of knowledge behind it. Take the most common ABS plastic shell of a remote control as an example: if the angle is too small, demolding becomes difficult; if it's too large, it may affect the product's dimensions, potentially requiring a larger mold and increasing costs.

Determining the value of this angle requires a careful balance of multiple factors. The material's "shrinkage rate" is a key factor—the greater the shrinkage, the tighter the plastic grips the mold, and the larger the required draft angle. The product's structure also plays a significant role. For thin-walled shells like remote controls with deep cavities and snap-fit buttons, the industry often relies on simulation software for precise analysis to find the optimal angle.

A recent study on a thin-walled TV remote control shell provides a typical case. The designer comprehensively considered requirements such as the material (ABS), precision (MT5 grade), and a scratch-free surface, ultimately determining a draft angle of 0.5° for the shell's side walls. This represents a fine balance between theory and practice.

If you have the design drawings of your product, you can contact us at Haina Mold to have them analyzed for you. We welcome you to ask us any questions.

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Email: ciky@hainamould.com