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    MOLDING DEVICES AND METHODS FOR MAKING ELASTOMERIC PADS FOR USE AS RAIL TIES
    1.
    发明公开
    MOLDING DEVICES AND METHODS FOR MAKING ELASTOMERIC PADS FOR USE AS RAIL TIES 审中-公开

    公开(公告)号：US20230228040A1

    公开(公告)日：2023-07-20

    申请号：US18002212

    申请日：2021-08-30

    申请人： Dow Global Technologies LLC

    发明人： Yinglong Chen ,  Larry Dotson ,  Huang Wu ,  Jason A. Reese ,  Kevin W. Light ,  Larry W. Mobley ,  Maria Jose Cotanda Santapau

    IPC分类号： E01B3/46 ,  B29C44/34 ,  B29C44/12

    CPC分类号： E01B3/46 ,  B29C44/351 ,  B29C44/1271 ,  B29K2105/041

    摘要： The present invention provides multi-layer articles for use as a rail tie footings comprising, as the tie, an elongate rigid body having a substantially planar surface, and on the substantially planar surface comprising a a microcellular foam elastomeric pad, for example, of a substantially organic solvent free polyurethane, wherein the substantially planar surface has a peripheral landing on which there is no elastomeric pad and the elastomeric pad has a bulk density (ASTM D3676) of from 600 to 2000 Kg/m3 (0.6 to 2.0 g/cm3). In addition, the present invention provides molding methods wherein the microcellular foam elastomeric pad is molded directly on the rail tie to form a durable footing, wherein the rail tie forms the bottom boundary of a molding chamber during molding and molding comprises forming the top and side boundaries of the molding chamber by inflating an annular pneumatic seal, positioning the seal on the substantially planar surface of the elongate rigid body and keeping the microcellular foam forming materials under pressure during molding.