DE3429745A1 - Process for increasing the output of cable-sheathing installations - Google Patents

Abstract

Process for increasing the output of cable-sheathing installations for the production of plastics-insulated electrical conductors. At high production rates during the sheathing of electrical conductors, the phenomenon occurs that the pulverulent lubricant or release agent used is knocked off the cores by vibrations and shaking, in turn greatly reducing the flexibility and sheath-stripping capability of the line on account of the sheath plastic on the core insulation. Electrostatic charging of the plastics-insulated cores produces an adhesive effect between the pulverulent lubricant or release agent and the plastics insulation of the cores which ensures a good and uniform application of lubricant or release agent even at very high production rates and thus ensures the flexibility and sheath-stripping capability.

Description

DESCRIPTION

The invention relates to a method for increasing the performance of cable sheathing systems for the production of plastic-insulated electrical conductors.

It is known to stick between multi-core electrical conductors to avoid the cable sheath and the core insulation by using a powdery Lubricant or release agent, e.g. talc, is applied. The procedures known today work in such a way that before the entry of the veins into the extruder head To apply the jacket insulation, pass the cores through a lubricant-filled one The container is running or pneumatically dusted with the lubricant. The known However, processes of this type have the disadvantage that the powdery sliding or Release agent due to vibrations and vibrations in the vein in front of the jacketed extruder or is partially knocked off again in the inlet of the spray head. This appearance leads at high production speeds to the fact that the jacket plastic on glued to the core insulation. As a result, the cable can no longer be stripped possible and the flexibility of flexible electrical conductors is not guaranteed.

The invention is therefore based on the object of finding a method with which the adhesion of the sliding or. Release agent is ensured and the performance of the cable sheathing system increased the pull-off speed to over 50. ° Ó will.

According to the invention this object is achieved in that an electrostatic Adhesive effect between a powdered lubricant or release agent and the plastic-insulated Cores of the cable to be sheathed by electrostatic charging of the core insulation is brought about.

A possibly undefined negative or positive charging of the wire avoiding isolation due to previous manufacturing processes is recommended after a further embodiment of the invention before the electrostatic charge, a discharge the core insulation. Depending on the cable structure, it can be useful be the application of the lubricant or release agent via the electrostatic charge the core insulation during the stranding process in the case of a multi-layer cable structure to undertake.

The advantages achieved with the invention are in particular: that even at the highest production speeds due to the sticking of the sliding or Release agent the flexibility and the ability to strip the cable is guaranteed. In particular, the flexibility of the cable is improved if the application of the sliding and release agent is already made when stranding the core, since in this Manufacturing stage the wire on its entire circumference with the sliding or. Release agent can be coated. Furthermore, the regularity of the lubricant or release agent application significantly improved, so that an irregular accumulation of the lubricant or release agent is excluded.

An embodiment and the mode of operation of the present invention is below with reference to the accompanying drawing, Figure 1, the inventive Process reproduces only schematically, explained in more detail.

The association of the insulated wires 1 is made by means of the input trigger 2 and the exit vent 3 withdrawn from the drain 4, through the extruder die head 6 promoted and wound up on the winder 5. Right behind the entrance fume cupboard A device for electrostatic charging 7 is attached in the withdrawal direction. With this high voltage generator, a high voltage field of approx. 10 KV The core insulation is electrostatically charged via an electrode arrangement. In the subsequent device for applying the lubricant or release agent 8 e.g. talcum powder is applied pneumatically to the veins.

As a result of the electrostatic charge, the lubricant or release agent adheres on the core insulation so strong that even at the highest production speeds (Withdrawal speeds) the lubricant or release agent is not in front of or in the subsequent injection head of the extruder 6 is knocked off. After applying of the outer jacket in the spray head, the finished cable 9 is cooled in the cooling section 10 and, as already mentioned, wound up over the exit trigger and the rewinder 5.

Claims (3)

CLAIMS 1. Process for increasing the performance of cable sheathing systems for the production of plastic-insulated, electrical conductors, characterized in, that an electrostatic adhesive effect between a powdery (conductive resp. Separating agent and the plastic-insulated wires of the cable to be sheathed an electrostatic charge of the core insulation is brought about. 2. The method according to claim 1, characterized in that before the electrostatic charge, the core insulation is discharged. 3. The method according to any one of claims 1 to 2, characterized in that that the application of the lubricant or release agent via the electrostatic charge the core insulation during the stranding process in the case of a multi-layer cable structure happens.