Milk, concentrated emulsifier solution, brine and margarine oils are prepared and stored in individual raw material tanks. Separate scale tanks for the oil and aqueous phases allow proper blending to ensure the correct margarine emulsion is produced. The prepared emulsion is then transferred to an emulsion feed tank. The entire emulsion is pasteurized using a WCB plate heat exchanger. The pasteurizer includes heating and cooling sections as well as a regeneration section to reclaim part of the energy input. A high pressure pump feeds the pasteurized emulsion to Votator® scraped surface heat exchangers equipped with controls to maintain product temperature and power sensing components to prevent freezing due to overcooling. The flow of cooled emulsion from the heat exchanger is then crystallized, plasticized and conditioned. Votator® agitated holding units are used for tub or bulk filling while Votator® quiescent holding tubes are used for stick molding or sheet printing. WCB multitube heat exchangers continuously remelt filler overfeed and return it to the pasteurization system. The remelt system is designed to handle the entire production rate during start-up or shutdown of the packaging machine.