For plastic products with threads, most of them use automatic rotating demolding mechanisms, which not only have high production efficiency but also short injection cycles, enabling automated injection molding production. This mechanism rotates the threaded core of the mold and moves it axially, or rotates the threaded core and moves the plastic part axially accordingly. The rotating mechanism is usually located on the side of the moving mold ejection mechanism. In order to prevent the plastic part from rotating simultaneously with the threaded core, a rotation stop must be provided on the plastic part.
The anti rotation forms of plastic parts can be roughly divided into outer anti rotation, inner anti rotation, and end face anti rotation.
The outer anti rotation adopts the form of straight patterned flowers; It is to process the sidewall of the cavity into longitudinal convex or concave patterns; Internal rotation stop is set on the inner side of the plastic part, usually with external threads; end rotation stop is set with grooves on the end face of the plastic part, commonly used for thick walled plastic parts; Text, markings, and other protrusions can be set on the inner end face of the plastic part to prevent rotation. The mold structure may vary slightly for different anti rotation structures. The convex pattern is used for stopping rotation, and the mold structure adopts a threaded core for rotation while the plastic part moves axially accordingly.