How to understand the “dog house” in plastic molding as following. All sharp corners are to be broken on dog houses, ribs etc.

Anyone can help?

Maybe it means "Bulge" here.
More context would be helpful to better understanding of this sentence.

Dear Zhou:
Thanks for your responds!
That originates from "Sharp Corners – All sharp corners are to be broken on dog houses, ribs etc." in IAC mould design rules.

Dear Tom:
Thanks for your clear explanation!
I have questioned many mold technical engineers about it ,but nobody knows it.So I am still comfused to it.Can you attach some links included illustrations as the best?
Many thanks!

Hi Zou,

No straight or "flat" walls should be designed flat or straight. They will always end up with an inward curvature. Walls of a box should always be designed with a sleight outward curvature and radii on all corners. The molded part will then be more close to intended design due to shrinkage and internal stresses at the corners.

Dog house is a 4 sided box attached to a flat surface which usually requires a riser/slide to mold. In other words, it has 3 sides and a "roof", where the roof usually has a hole for attachment purposes.

Hi,Phililip:
Thanks for your responds!
But I still feel confused at "dog house".
Do you have a PDF document of Mold Design and Manufacturing or about the mold field to sent me? I want to learn more.
I will be very thankfulness to you.
Many thanks!

Phillip, if you correctly cool the mold, you do not have to play the windage to achieve straight walls.