| 摘要 |
Method for simultaneous and continuous foaming of two or more panels (2), of the type each comprising a pair of external layers (3) of web material (7) between which an intermediate layer (4) is interposed made of polyurethane or phenolic material comprises the steps of: - i. moving through a foaming station (6) pairs of continuous web material(7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f ) arranged mutually alongside, each pair comprising two web material spaced apart from one another, which are the precursors of respective external layers (3); - ii. simultaneously dispensing a plurality of distinct jets of polyurethane or phenolic mixture into a lower zone (I) of a respective pair of web material (7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f), and containing below the polyurethane or phenolic mixture, enabling the upward expansion thereof; - iii. wherein during the movement in the foaming station (6) the web material (7; 7a, 7b, 7c, 7d; 7e, 7m, 7n; 7f) of each pair lie on respective vertical planes (V1, V2, V3, V4) and move along a horizontal advance direction (A), and - iv. contrasting the thrusts exerted by the expanding polyurethane or phenolic mixture transversely to the advance direction (A) by means of guiding and resting surfaces (10, 14, 29, 30) extending along the horizontal advance direction (A). A respective apparatus for implementing the above method is provided. |
