| 摘要 |
A method of making office supplies such as document folders assembled by ultrasonic welding of polymer sheets, uses, during the ultrasonic welding stage, a sheet of screening material (4) placed between the third sheet of polymer (3), placed opposite the weld part of the two main sheets (1,2) forming the folder; and the second sheet (2) so that the third and second sheet are not welded together during the welding of the first and second sheet. Also claimed is the production equipment consisting of:- a mechanism for cutting out the second polymer sheet (2'), a mechanism for bending, grooving and folding back the sheet to define the spine and front and back of the folder; the screen (4) being cut from a band in the form of a label (12) to the partly visible on the folder spine, a mechanism for cutting out the third sheet (3) to form the label carrier; a means of bringing all the parts together in their correct relative position and an ultrasonic welder. |
