| 摘要 |
A BUILDING BOARD COMPRISES A CORE 20'' OF GYPSUM WHICH HAS PENETRATED A GLASS FIBRE SHEET 24 EMBEDDED IN ONE FACE AND A COATING OF GYPSUM INTEGRAL WITH THE CORE MATERIAL WHICH HAS PASSED THROUGH THE SHEET. APPARATUS FOR MAKING SUCH A BOARD COMPRISES: A LOWER FORMING SURFACE 18 AND AN UPPER FORMING SURFACE DEFINING A FORMING ZONE BETWEEN THEM IN WHICH THE PLASTERBOARD IS FORMED; A SUPPLY 10 OF A FIRST SLURRY TO THE LOWER FORMING SURFACE; A SUPPLY 28 OF A SECOND SLURRY TO A GLASS FIBRE SHEET 24 TO COAT THE UPPER SURFACE OF THE SHEET WITH THE SECOND SLURRY; MEANS FOR PASSING THE COATED SHEET INTO THE FORMING SPACE, WHEREBY THE LOWER SURFACE OF THE SHEET CONTACTS THE UPPER SURFACE OF THE FIRST SLURRY; AND A VIBRATOR ROLLER 42 FOR VIBRATING THE UPPER FORMING SURFACE SO THAT THE FIRST SLURRY PASSES THROUGH THE SHEET INTO THE SECOND SLURRY. A METHOD OF MAKING THE BOARD IS ALSO DISCLOSED.FIGURE 1
|
