5454封(feng)(feng)(feng)頭(tou)是(shi)(shi)指用(yong)以封(feng)(feng)(feng)閉容器端部使其內外介質隔離的元件，又稱端蓋(gai)。圓筒形(xing)(xing)(xing)(xing)容器的封(feng)(feng)(feng)頭(tou)一般都是(shi)(shi)迥轉殼體。按封(feng)(feng)(feng)頭(tou)表面的形(xing)(xing)(xing)(xing)狀可分為凸形(xing)(xing)(xing)(xing)、錐形(xing)(xing)(xing)(xing)、平板形(xing)(xing)(xing)(xing)和組(zu)合形(xing)(xing)(xing)(xing)。凸形(xing)(xing)(xing)(xing)封(feng)(feng)(feng)頭(tou)是(shi)(shi)指外表面形(xing)(xing)(xing)(xing)狀為凸面的封(feng)(feng)(feng)頭(tou)，如半球(qiu)形(xing)(xing)(xing)(xing)、橢圓形(xing)(xing)(xing)(xing)、碟(die)形(xing)(xing)(xing)(xing)和無折(zhe)邊球(qiu)形(xing)(xing)(xing)(xing)封(feng)(feng)(feng)頭(tou)等。有的氣瓶采用(yong)凸面向內的組(zu)合形(xing)(xing)(xing)(xing)底(di)封(feng)(feng)(feng)頭(tou)，既可保證強(qiang)度，又能滿足安(an)全使用(yong)的需求(qiu)。
