THREAD CORE MOUNTING

Simply install core in core nut and secure with two set screws. The thread core mounts in the core holder via a common 16 mm dia. shank system. Moldmakers need to fabricate their own thread core defining the geometry of the mold-in thread. Pitch should include shrinkage.

POSITIONING - A Brief Review

To guarantee a precise thread start position, the core holder must run against a fixed stop with its entire front surface area at a pressure not exceeding 40 bar. The flow of hydraulic fluid must be shut off by use of a proximity switch slightly before the core holder touches the fixed stop. For the core holder retraction movement, the unscrewing pressure must be higher than the screw-in pressure. However, the unscrewing pressure should not be higher than 100 bar. The retraction of the core holder must again be stopped by a proximity switch. This will involve some after running. Care should be taken to ensure that the core holder does not run up against a fixed stop at this point. In case this has happened, the core holder must be released manually. With through-thread, note that the core holder must not touch but should have up to 0,02 mm clearance upon reaching the thread start position. This amount of play will not result in melt film formation.

RIGHT ANGLE-
THRU-HOLE CORE DESIGN

A hole in the CORE SHAFT allows diverse molding options like - upstanding cores, core cooling tubes or blowing needles for making bottles or containers.

RIGHT ANGLE-
APPLICATIONS and INSTALLATIONS

"NTGA" type compact unscrewing device shows its merits in two molding applications. The upstanding cores (marked red) are passed through the telescopic sleeve and secured against turning behind the unscrewing device. Unique thru-hole is ideal for threaded core cooling. (marked blue). Right Angle units can be ejector or edge mounted.