The process involves many parameters such as friction, metallurgical, extrusion tools design and selection like Die - Nipple, temperature and speed parameters…..
Solid lead in the form of ingots (via lead feeding device) are loaded into the electrically heated melting pot, where it is heated to a temperature around 380 degrees centigrade.
The melting point of lead is around 327 degree centigrade.
The lead passes through the various zones (after being melted) of the melting pot and then to the gravity feed pipe, via the melting pot outletvalve.
The electrically heated feed pipe allows the lead to pass through its omega construction to the straight inlet pipe and into the screw housing.
Liquid lead is very hygroscopic and can pass through openings that water cannot penetrate. so when the liquid material arrives at the screw housing, needs to be made plastic before it canbe transported by the rotating extrusion screwwithin the screwhousing.
To do this, regulated amounts of cooling water areappliedtothethreecoolingzonesofthescrew housing.
Once transportation starts ; the lead is forced at high pressure into the die block.
The die block forms the lead into a tube as it passes through the extrusion Nipple (Wire guide) and then die.
As the lead is applied on the cable, the lead sheath shall immediately be cooled to prevent damage to the cable core (inner layers of cable).
The concentricity and thickness of the lead sheath can be controlled within low tolerance
Fromexperiencewecanadviseourcustomerson thetypeofleadalloytousebuttheparameterswill depend upon the machines mechanical condition.
The machine is started by selecting running from the panel PC panel touch screen and pressing the auto-start button.
That’s it, stand back and watch! Other functions of the system are included on- screen diagrams and allow printouts of operating charts. The predefined menu and the control system interface will control all temperature, extrusion speed and other functions.