Kiss off and Shut off in mold design

Two photos for understand and remember well kiss off and shut off.

kiss off & shut offkiss off & shut off

Some guys are confusion for kiss off and shut off in mold design. The key is to see core and cavity, it will be kiss off if they kiss each other(Mouth to mouth), and it will be shut off if they brush past(Side face to side face).

1. Part structure

kiss off & shut off

2. Kiss off and Shut off in mold design

kiss off & shut off

 

3. Shut-offs Help Create Part Features 

Shut off should have draft, it could solve unwanted plastic and reduce abrasion. Shut-offs in straight-pull molds will allow you to design many different features that fall in to three basic categories: Holes, hooks, and long through holes without the use of side-actions (cams).

Shut-offs require greater draft to reduce the amount of wear on the mold and form a better seal under clamping force during molding. The minimum draft of 3 degrees allows greater clearance for the sealing faces on opposite sides of the mold to pass by one another without the risk of gouging and wear.