| 摘要 |
Rigid foam or cellular synthetic resin moldings having three dimensional configuration are continuously formed by a molding machine having a movable pressure tunnel defined by two or more, preferably three, endless resilient belts and endless rigid backup conveyors. The resilient belts in their relaxed condition will conform to the three dimensional configuration of the molding to be produced and are resiliently deformable when traveling around corners between their molding runs and return runs. At least one or more of the rigid backup conveyors is constructed of a plurality of metal plates hingedly connected together along adjacent edges to form an endless chain, and a corresponding plurality of shaped blocks formed from material extruded to substantially the width of the plates and cut to substantially the length of the plates to be rigidly or integrally secured respectively to the outer surface of the plates. Each of the blocks has a generally continuous outer surface generally continuously supporting the surface of the adjacent molding belt within the molding zone, which belt surface is opposite to its molding surface. For rigidity, a plurality of ribs extend between the outer support surface of the blocks and their respective plates. The hinges connecting the plates together may have lost motion transverse to the conveying direction to provide, with guide means, shifting of the plates to clamp the belts tightly together where they overlap on their sides within the molding zone.
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