Method for preparing detergent compositions

Claim 1

IN A PROCESS FOR PREPARING AERATED DETERGENT BARS FROM A FLOWABLE DETERGENT MASS CONTAINING A COMPATIBLE GAS, BY MEANS OF A DEVICE WHICH EXTRUDES THE AERATED DETERGENT IN A CONTINUOUS SHAPE-RETAINING STRIP AND WHEREIN THE DETERGENT MASS MOVES SEQUENTIALLY IN SAID DEVICE FROM THE INLET THEREOF THROUGH A SCRAPED-WALL COOLING ZONE, A MIXING ZONE AND DISCHARGE ZONE TO AN EXTRUSION OUTLET, THE IMPROVEMENT WHICH COMPRISES IMPEDING THE FLOW OF THE DETERGENT MASS BEYOND THE AFORESAID SCRAPED-WALL COOLING ZONE AND MIXING ZONE AND PRIOR TO THE EXTRUSION OUTLET WHEREBY THE SAID DISCHARGE ZONE IS DIVIDED INTO A ZONE OF HIKER BACK PRESSURE AND A ZONE OF LOWER BACK PRESSURE, THE SIAD MASS IN THE ZONE OF HIGHER BACK PRESSURE BEING UNDER A PRESSURE SUFFICIENT TO HOLD A MAJOR PORTION OF THE COMPATIBLE GAS IN SOLUTION IN THE DETERGENT MASS, RELEASING THE MASS INTO THE AFORESAID ZONE OF LOWER BACK PRESSURE, WHEREBY A PORTION OF THE COMPATIBLE GAS IN SOLUTION IN THE DETERGENT MASS IS RELEASED FROM SOLUTION AND BECOMES DISPERESED THROUGHOUT THE DETERGENT MASS IN SMALL BUBBLE FORM, AND RELEASING THE MASS THROUGH THE EXTRUSION OUTLET TO ATMOSPHERIC PRESSURE, WHEREBY COMPATIBLE GAS STILL IN SOLUTION IN THE DETERGENT MASS IS RELEASED FROM SOLUTION, THE COMPATIBLE GAS BEING DISPERSED AS VESICULATED GAS THROUGHOUT THE EXTRUDED DETERGENT MASS.