The most common method is clipper and spiral seam. It can connect the filter fabrics and filter screens effectively into ring, long life time, no wrinkles.
最常用的是钢扣连接，螺旋连接，能有效将滤布、滤网连成环形，并且使用寿命长，滤布不打皱。
Because of the much thick wall of large capacity boiler drum, the pressed and weld longitudinal seam is used to manufacture the drum shell ring.
由于大容量电站锅炉汽包的壁较厚，所以在汽包筒节制造时常采用压制成两个半圆瓦片再焊接而成的方法。
NM covers have no creases, ring wear or seam splits of any kind. Covers with cutout markings can never be considered NM.
唱片封套没有任何折痕、圈印或是裂缝。封套有剪裁过的缺角也不能当NM。
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