From my observation of juicers that friends have is the problem of frothing of the juice. Does any juicer deliver a juice that does not have this problem?

Most juicers produce a froth. Some produce less froth than others. I can suggest using a strainer to strain the juice as it comes out of the juicer before it goes into the collection bowl to reduce the froth. It has also been reccomended to use a gravy seperator to remove the froth.