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VOLATILE LIQUID SUPPLY EQUIPMENT AND PROCESSES AND APPARATUS FOR INTRODUCING VOLATILE CROSS-LINKING AGENTS INTO POLYOLEFIN COMPOUNDS AND FOR THE EXTRUSION OF CROSS-LINKABLE POLYOLEFIN COMPOUNDS
VOLATILE LIQUID SUPPLY EQUIPMENT AND PROCESSES AND APPARATUS FOR INTRODUCING VOLATILE CROSS-LINKING AGENTS INTO POLYOLEFIN COMPOUNDS AND FOR THE EXTRUSION OF CROSS-LINKABLE POLYOLEFIN COMPOUNDS
VOLATILE LIQUID SUPPLY EQUIPMENT ANDPROCESSES AND APPARATUS FOR INTRODUCINGVOLATILE CROSS-LINKING AGENTS INTOPOLYOLEFIN COMPOUNDS AND FOR THEEXTRUSION OF CROSS-LINKING POLYOLEFINCOMPOUNDSAbstract of the DisclosureIn accordance with an exemplary embodiment of the instantinvention, a volatile cross-linking agent such as liquid peroxide isintroduced, at ambient temperature and under atmospheric pressuredirectly into the input of an extruder at the same pressure as a poly-olefin compound to be cross-linked. The resulting compounds are putunder pressure within the extruder as the temperature increases so thatthe mixture reaches its definitive shape at the extruder output and maybe fed directly into a hot cross-linking enclosure which is maintainedunder pressure. The peroxide is thus incorporated in a singleoperation permitting complete control of the ingredients mixed andallowing perfect homogenization of the mixture while defusion and con-sequent loss of the highly volatile peroxide are avoided. The system forintroducing the highly volatile cross-linking agent includes a peroxidestorage tank, a filling pump, a feed vessel, an incremental feed pumpwith a pressure meter, a flow meter and numerous safety features.These elements control the flow, temperature and ambientconditions of the cross-linking agent feed system within a controlledenvironment to ensure the same and precise handling of a highlyvolatile liquid while at the same time controlling the feeding ofthe liquid as a function of the material processed by the extruder so thatthe percentage of the cross-linking agent inserted at the input to the-i-extruder remains at a constant, predetermined percentage, regardlessof extruder speed variations. Additionally, various additives whichare soluble in the volatile cross-linking agent may be introduced withinthe feed system therefor in sufficient amounts for effecting protectionof the resulting polymer without altering the efficiency of the feed systemor that of the additive so that the entire process may be carried out atthe processing site without initial preparation of various mixtures to befurther processed.-ii-
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