| 摘要 |
<p>PROCESS FOR MAKING A PARTICLE BOARD RAILROAD TIE A process for making a particle board railroad tie utilizing any of a wide assortment of comminuted lignocellulosic materials. The particle board railroad tie is prepared by mixing dried lignocellulosic particles with one or more thermosetting or thermoplastic adhesive binders in predetermined proportions, and placing a measured amount of the resultant mixture in an elongate mold where it is bonded together under the influence of pressure. The mold includes a movable pressure plate forming the top of an enclosure within which the material is compressed to a predetermined thickness by pressure applied to the exterior of the plate. The thickness of the compressed mixture is substantial, to enable the production of particle board pieces having sufficient continuous solid thickness that they may be used for railroad ties. After the mixture in the mold has been compressed to the predetermined thickness, fasteners are attached for retaining the pressure plate in its compressed position. Thereafter the mold is taken from the press and its contents are hardened while still under pressure from the retained pressure plate, after which the pressure plate is removed from the mold permitting the removal of the resultant bonded particle board railroad tie.</p> |
