Falling film type evaporators and method

Claim 1

A FALLING FILM TYPE EVAPORATOR, COMPRISING A HEAT EXCHANGE WALL MEMBER, SAID WALL MEMBER COMPRISING A PLURALITY OF SUBSTANTIALLY SIMILAR OPPOSED SHEET SECTIONS OF LIGHT GAUGE HEAT TRANSMISSIVE MATERIAL POSITIONED IN SPACED SUBSTANTIALLY VERTICAL SIDE BY SIDE RELATIONSHIP TO FORM AN ELONGATED ROW, MEANS FOR JOINING ONE OF THE SUBSTANTIALLY VERTICAL END EDGES OF EACH OF SAID SECTIONS TO THE OPPOSED EDGE OF THE NEXT ADJACENT SECTION TO FORM A PLEATED STRUCTURE PROVIDING A PLURALITY OF SUBSTANTIALLY SIMILAR INTERSPACES BETWEEN SAID SECTIONS, SAID INTERSPACES ALTERNATELY OPENING TO ONE VERTICAL SIDE AND THEN THE OTHER OF SAID STRUCTURE, VAPOR BODIES POSITIONED ALONG THE OPPOSITE SIDES OF SAID STRUCTURE THROUGHOUT SAID ROW, SAID VAPOR BODIES COMPRISING VAPOR CHAMBERS EACH FORMED WITH AN OPENING IN THE WALL THEREOF, THE FIRST VAPOR BODY, ON ONE SIDE OF SAID ROW, COMMUNICATING THROUGH THE OPENING IN THE WALL THEREOF WITH ONE SET OF SAID INTERSPACES, AND THE SECOND VAPOR BODY, ON THE OTHER SIDE OF THE ROW, COMMUNICATING THROUGH THE OPENING IN THE WALL THEREOF WITH THE ALTERNATELY OPENING SET OF SAID INTERSPACES, MEANS IN FIRST, ALTERNATE ONES OF SAID INTERSPACES ALONG SAID PLEATED STRUCTURE COMMUNICATING WITH THE FIRST VAPOR BODY FOR DISTRIBUTING LIQUOR TO BE VAPORIZED IN THE FORM OF A FALLING FILM ON THE HEATING SURFACES PROVIDED BY THE SHEET SECTIONS OF SAID PLEATED STRUCTURE, SAID DISTRIBUTING MEANS DISTRIBUTING SAID LIQUOR ADJACENT THE TOP OF SAID HEATING SURFACES, AND MEANS TO PREVENT THE ENTRAPMENT OF NON-CONDENSABLE GASES IN SAID FIRST AND SECOND INTERSPACES COMPRISING SMALL PASSAGES THROUGH THE SHEET SECTIONS ADJACENT THE CLOSED VERTICAL EDGES OF THE INTERSPACES.