The internal core of DKF Solid and DKF Eco consists of multiple spiral wound plies of glued kraft paper and/or tube cardboard. Moisture and grease repellent coatings are possible as options. The core is glued or clipped to the shipping tube bottom. On request, it can also be delivered in unbonded form. All of our internal cores feature a punched hole for the end of the wire. The diameters of the internal core depend on the outer cylinders and are as follows:
Various designs
simple type
with double slots for the metal rod that the rubber pull cord connects to the bottom
with top crimping for greater stability and a smoother wire run
with top metal reinforcement in the form of a beaded top band of galvanised steel sheet
with glued-in round cardboard panel for greater stability and as a compartment for silica gel