In 2004 I visited one that used to make refrigerators. Its workers had stripped it of everything valuable, then torched it so thoroughly that the warehouse was a sculpture of buckledsheet metal.
Buckle folding: Method of folding sheets of paper where the sheet is bent or Buckled by a metal plate.
栅栏式折页(梳式折页)：用金属栅栏把纸张弯曲屈折的方法。
3
The sliding block is further provided with a metal buckling sheet of which the hook part can be buckled with a groove on the butting connector in order to fix the butting connector.