(1) In general, the ejection distance of the plastic mold slant top will not be very long, and it is easy to break. Plastic molds that can realize fully automatic production, the ejection distance of the slant top can be farther than the semi-automatic pickup slant top ejection distance, in order to prevent uneven force when the robot picks up the parts, resulting in uneven force when picking up the parts. Fully automatic eject distance = product height (H) + safety value (K) 5.00 ~ 10.00mm; semi-automatic production eject distance = product height (H) X (2/3) (2) The angle range of the slanting top is 3°~15°, and the z-optimal range is 3°~8°. When the angle of the slanting top is more than 12°, in addition to considering the strength, it is also necessary to increase the auxiliary rod to prevent the plastic mold slanting top from deforming and breaking due to excessive torque during the production process. (3) the most likely to appear in the production of the product sticky slant top phenomenon, the common method is to make the product release angle increase, the design should avoid the plastic mold slant top appear too much tendon position. (4) slanting top bar should not be too thin, small workpiece slanting top z small for thickness 3.00mm, greater than 500.00mm workpiece, slanting top z small thickness shall not be less than 25.00mm, in order to prevent the production of plastic mold slanting top due to excessive torque and deformation fracture. (5) plastic mold slant top belongs to one of the ejector mechanism, used as an ejector product, in the same position with slant top area does not need to put the top, to avoid the slant top and ejector interference, slant top and ejector interference, need to do simulation verification. (6) in the injection production, very afraid of encountering the problem is the slant top twist deformation, root fracture, in the design, plastic mold slant top tilt angle and tilt distance, slant top material, slant top size, slant top design will have an impact on the slant top. Because of its own structure is relatively easy to damage, so in the injection production, it should be carefully repaired and replaced to avoid hidden problems such as the front mold slanting top does not retreat, slanting top running burrs.