Importance

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Abstract

For fulling, the mineral fiber sheets (11) are moved in the direction of the arrow by means of two endless studded belts, only the lower one (15) of which is visible in the drawing. By means of the first fulling tool (29), pre-fulling to a depth of about 8 cm is effected. With the second fulling tool (30), fulling to a depth of about 11 cm is effected. During the fulling process, the region of the mineral fiber sheet (11) not belonging to the fulling zone is supported on the bottom and top, so that a change in the fibrous structure of the material takes place only in the peripheral region that subsequently forms a compressible zone (23). The fulling is done from the side, or in other words in the same direction as the later compression upon installation of the mineral fiber sheet between two rafters. To prevent sagging of the mineral fiber sheet (11) during the fulling process, guides, only the lower guide (27) of which is visible, are disposed in the region of the fulling zone above and below the mineral fiber sheet. Each fulling tool (29, 30) comprises a plunger (32) with a cylindrically curved surface (31), over which an endless belt (37) is guided. The belt travels at practically twice the speed of the mineral fiber sheet (11). During the passage of the mineral fiber sheet (11), the plunger (32), driven by the crank drive mechanism (43), executes a number of pivoting motions about the pivot shaft (41).

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First Claim