Process for making rigid polyurethane foam laminate
Abstract
Abstract PROCESS FOR CONTINUOUSLY MANUFACTURING LAMINATED ARTICLES HAVING A PLASTICS OR RESINOUS FOAM CORE SANDWICHED BETWEEN AND BONDED TO TWO OUTER SHEETS OF FACING MATERIAL IN WHICH, AFTER THE FOAM-FORMING INGREDIENTS HAVE BEEN APPLIED TO THE LOWER SHEET AND THE TWO SHEETS ARE CONVEYED IN PARALLEL DISPOSITION WITH EACH OTHER WHILST THE FOAM LAYER IS FORMED BETWEEN THEM, AND SUBSEQUENTLY TO THE OCCURRENCE OF NOT LESS THAN 75% OF THE TOTAL EXPANSION OF THE FOAM LAYER BUT BEFORE SETTING IS COMPLETE, THE COMPONENTS OF THE LAMINATE ARE SUBJECTED TO A PREDETERMINED YIELDABLE PRESSURE AND CONVEYING MOTION IS IMPARTED TO THE TWO SHEETS UNDER THE INFLUENCE OF THAT PRESSURE. ALSO APPARATUS FOR PERFORMING SUCH A PROCESS WHICH COMPRISES A FOAM DISPENSING MEANS AND MEANS FOR CONVEYING THE UPPER AND LOWER SHEETS OF FACING MATERIAL, THE CONVEYING MEANS BEING SUCH AS TO EXERT A PREDETERMINED YIELDABLE PRESSURE ON THE FOAM AT A STAGE WHEN NOT LESS THAN 75% OF THE TOTAL EXPANSION OF ITS FOAM HAS OCCURRED BUT BEFORE SETTING OF THE FOAM IS COMPLETE.
Inventors
- 👤 Alan Metcalf Wooler
Bibliographic Details
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