Cov teb chaws uas tau tsim kho tau hloov daim PA66 rau kev kho tsheb nrawm rau xyoo 1970s. Tom qab ntau tshaj 40 xyoo ntawm kev siv thiab kev loj hlob, PA66 tau siv dav hlau raileners xws li casings, gauge blocks thiab baffle seats. PA66 muaj cov khoom ua vaj tse zoo tshaj plaws thiab ib qho me me tshwj xeeb. Muab piv nrog cov khoom hlau, nws yog lub teeb nyob hauv qhov hnyav, xeb-puavpheej, kev kho-resistant thiab poob siab-resistant. Nws muaj kev ua tau zoo heev thiab tsim tau yooj yim. Nws tuaj yeem siv rau hauv kev tsheb ciav hlau los mus daws cov locomotives. Cov teeb meem muaj suab nrov thiab lub suab nrov thaum lub lag luam, thiab kev ruaj ntseg ntawm lub logbase tuaj yeem tswj tau, cov xov tooj ntawm cov nqi kho yuav raug txo, thiab qhov kev ua haujlwm zoo yog qhov tseem ceeb heev rau kev ruaj ntseg ntawm kev khiav tsheb ceev. Tus neeg tsav tsheb tus neeg tsav tsheb yuav tsum kom muaj li 2.2 mus rau 3.0 tuj ntawm cov khoom siv hluav taws xob ntawm ib lub voj voog. Britain, Lub teb chaws Yelemees thiab lwm lub teb chaws yeej ib txwm muaj monopolized cov tshuab kev siv tshuab nylon rau cov neeg caij tsheb npav loj. Nyob rau hauv xyoo tsis ntev los no, suav engineering plastics cov tuam txhab muaj peev xwm tau ntse tsim cov khoom tshwj xeeb rau engineering uas yog PA66 rau cov neeg siv high-speed rail fasteners.
![_%7F$]4(GSJNZQX_93AT{W9.png](/Content/upload/2018279890/201807072102077474841.png "_% 7F $] 4 (GSJNZQX_93AT {W9.png")
High-speed rail fastener system schematic
