PET Mold Solutions

When I arrived, the hot runner was on the bench and open. After vacuuming out the white dust I found a lot of liquid resin had run down the manifolds from the weepage system. There was a large build up at the bottom of the pocket. I chipped out the degraded plastic and found fresh green plastic at the main/cross manifold interface. The cross manifold was removed from the hot runner and the leak was confirmed.

Using an M20 tap I threaded the four BeCu bushings and then used a puller to remove them. The manifolds and the bores were cleaned. After placing the new bushings in dry ice they were installed into the manifold, the height was checked and found to be within spec. With the center insulator removed, the cross manifold was “Blued” onto the four main manifolds and all were hitting well. The height of the manifold was checked and found to be within spec.

The cross manifold was removed. New thermocouples were installed onto the cross manifold and it was installed complete with a new center insulator. The heater wires were connected and the four new back up insulators were installed along with the backing plate. Final electrical checks were completed and recorded, the water circuit was pressure tested and passed. The hot runner was installed into the machine, aligned and all services were connected. The zones #9 and #10 (cross manifold) were turned on and reacted as expected.

After running for several hours, the hot runner was removed and checked. The internal leak has been resolved.