| 摘要 |
<p>The production of structural sheathings or facings having an underlayer affixed thereto, to serve as an acoustical insulating structural member, said underlayer being formed by the combination of mineral fibers, particularly glass fibers of relatively long length in interlaced condition, which is permeated with thermoplastic compositions comprising mixtures of one or more elastomers such as natural or artificial latex, and one or more adjuvants for promoting a chemical bond between the mineral fibers and elastomer component. This underlayer is prepared by forming a mat by the deposition of the mineral fibers in successive layers, which is followed by the thorough impregnation of the fibers with an aqueous dispersion of said thermoplastic composition, the withdrawal of the excess of the latter from the impregnated mat, and the drying of the mat and the final heating thereof to attain an effective reticulation of plastic composition amongst the glass fibers before the mat is accumulated on a storage roller. The final production step of gluing of the underlayers to a sheathing or other support is rendered more secure and satisfactory by partially or completely clogging the pores at one or both faces of the underlayer with a special filling layer before the glue is applied thereto. Furthermore, the appearance of the underlayer on its support is improved, especially when the latter is a vinyl plastic, by removing the folds therefrom which are caused by the rolling up of the former on a reel in the course of its preparation. The elimination of these folds is attained by heating the mat immediately prior to its fixing on its support to relieve slightly the binding of the layers of fibers by the thermoplastic material, which gives rise to a re-arrangement of the stratification of fibers adjacent to the surfaces of the underlayer.</p> |
