Process and apparatus for applying coatings to insulating panels and laminated insulating panels

Claim 1

A PROCESS FOR THE PRODUCTION OF HARD BUT RESILIENT LOAD-BEARING INSULATING PLATES, WHICH COMPRISES COATING A FOAMED PLASTIC CORE PLATE, IN HORIZONTAL MOTION AT A STEADY SPEED, BY DIRECTLY DROPPING THEREON, AT ONE POINT OF ITS TRAVEL, SMALL PARTICLES OF A PLASTICIZED WATER-BASED COATING SELECTED FROM THE GROUP CONSISTING OF CONCRETE, ROMAN LIME, ROMAN CEMENT, MAGNESITE MIXED WITH MAGNESIUM CHLORIDE LIQUOR, AND FOAMED POLYSTYRENE IN THE ABSENCE OF ANY EXTRANEOUS ADHESIVE INTERLAYER; SMOOTHING THE DROPPED COATING INTO A CONTINUOUS COVERING LAYER; COMPRESSING THE SAME; COVERING SAID COMPRESSED LAYER WITH GLASS FIBER FABRIC; DROPPING A SECOND COAT ONTO SAID FABRIC; SMOOTHING INTO A CONTINUOUS SECOND COVERING LAYER; COMPRESSING AND SHAPING INTO A DESIRED SURFACE PATTERN; BOTH SMOOTHING AND COMPRESSING OPERATIONS BEING CARRIED OUT WHILE APPLYING A SAWTOOTH OSCILLATION OF APPROXIMATELY 20 TO 50 MM. AMPLITUDE AND A FREQUENCY OF APPROXIMATELY 280 TO 360 OSCILLATIONS PER MINUTE.