What is kiss off & shut off?
Some guys are confusion for kiss off & shut off in mould 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).
Two photos for understand and remember well kiss off and shut off.
1. Part structure
2. Kiss off and Shut off in mould design
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 moulds 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 mould and form a better seal under clamping force during moulding. The minimum draft of 3 degrees allows greater clearance for the sealing faces on opposite sides of the mould to pass by one another without the risk of gouging and wear.