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    • 22. 发明申请
    • METHOD AND APPARATUS FOR CONTINUOUS FOAMING OF A PANEL
    • US20170157815A1
    • 2017-06-08
    • US15325598
    • 2015-07-10
    • CANNON S.P.A.
    • Marco VOLPATOAlberto BONANSEA
    • B29C44/30B29C44/60B32B5/20B29C44/32
    • B29C44/30B29C44/308B29C44/32B29C44/60B29K2075/00B29K2105/04B29K2995/0015B29L2007/002B32B5/20B32B2307/304B32B2375/00B32B2607/00
    • A method for continuous foaming of a panel of the type including outer layers of web material between which an intermediate layer of insulating foam is interposed, includes the steps of supplying first and second web materials, which are precursors of the outer layers, according to respective mutually converging directions to a dispensing station of reactive mixture intended for generating the intermediate layer of insulating foam. The first and second web materials are oriented according to planes that tilt mutually and converge downwards so as to bound a V-shaped hopper zone. Between the web materials, a calibrated slit is defined in the bottom of the hopper zone for dragging the reactive mixture with squeezing and distribution to the end edges of the web materials. The hopper zone is at least partially filled with the reactive mixture for simultaneously wetting the two web materials advancing downwards. The two web materials are continually advanced along a very steep, vertical or very tilted portion of path, dragging the reactive mixture progressively downwards. A guiding and resting action is supplied along the vertical portion to the first and second web materials to advance the first and second web materials substantially mutually parallel at a controlled mutual distance. Downstream of the portion of vertical or very tilted path, the web materials are diverted along a successive curved portion of foaming path. Downstream of the curved portion, the first web material is guided along a first resting and guiding plane, that is horizontal or almost horizontal, and the second web material is guided along a second resting and guiding plane, tilted with respect to the first resting and guiding plane, such that the first and second web materials advance in a mutually divergent manner at a growing distance from one another along a transition portion of the foaming path along which a guided expansion of the reactive mixture develops. A resting action is provided to the web materials and, with the interposed expanding foam, by two parallel belt conveying devices, along a substantially horizontal final portion of the path to enable the foam reaction to be completed and the shape of the foam to be stabilised. An apparatus for implementing the aforesaid method is also provided.