公开(公告)号：WO2021142103A1

公开(公告)日：2021-07-15

申请号：PCT/US2021/012476

申请日：2021-01-07

申请人： DOW GLOBAL TECHNOLOGIES LLC

发明人： CHEN, Yinglong ,  DOTSON, Larry D. ,  WU, Huang ,  REESE, Jason A. ,  LIGHT, Kevin W. ,  BAKER, Annette ,  CLINTON, J. Cody

IPC分类号： B05B13/00 ,  B05B12/00 ,  B05B12/126 ,  B05B12/1418 ,  B05B13/005 ,  B05B13/0278 ,  B05B13/041 ,  B05B7/0018 ,  B05B7/0093 ,  E01B2204/01 ,  E01B3/46

摘要： The present disclosure provides for an automated spray system (100) to produce an elastomeric pad on a railroad tie. The automated spray system (100) includes a two-component spray system (102) for spraying a two-component reaction mixture to produce the elastomeric pad on the railroad tie. The automated spray system further includes a gantry system (140) having girder (146) that supports the spray applicator.

公开(公告)号：WO2022051208A1

公开(公告)日：2022-03-10

申请号：PCT/US2021/048170

申请日：2021-08-30

申请人： DOW GLOBAL TECHNOLOGIES LLC

发明人： CHEN, Yinglong ,  DOTSON, Larry ,  WU, Huang ,  REESE, Jason A. ,  LIGHT, Kevin W. ,  MOBLEY, Larry W. ,  COTANDA, Maria-Jose

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

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 direcly 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.