Mae taflen ddur rhychiog wedi'i gwasgu (dalen doi) yn cyfeirio at y ddalen ddur a ffurfiwyd trwy wasgu oer neu rolio oer. Mae'r ddalen ddur wedi'i gwneud o ddalen ddur lliw, dalen ddur galfanedig, dalen ddur gwrthstaen, dalen alwminiwm, dalen ddur gwrth -gorlifol neu ddalen ddur denau arall.
Mae gan y ddalen ddur wedi'i phroffilio nodweddion pwysau ysgafn, cryfder uchel, pris isel, perfformiad seismig da, adeiladu cyflym ac ymddangosiad hardd.
The corrugated metal is a good building material, mainly used for house roofing, wall building, guardrail, floor and other buildings, such as airport terminal, railway station, stadium, concert hall, grand theatre, etc. According to different application requirements, the profiled steel sheet can be pressed into a wave type, a T type, a V type, a rib type and the like.