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Manufacture of Pressure-Sensitive Products
Published in István Benedek, Mikhail M. Feldstein, Technology of Pressure-Sensitive Adhesives and Products, 2008
Conversion of labels is the production of narrow rolls (or sheets) of finished labels, postprinted, die-cut, slit-cut, perforated, and rewound. A revarnishing may be necessary, requiring a separate drying unit (e.g., a UV dryer). Machine-direction cutting (slitting) or cross-direction cutting of the web are common operations for labels, tapes, and protective films. Die-cutting is generally the operation that transforms a pressure-sensitive web into a label (or business form) laminate, but it is used for special tapes also. In-line sheeter, nonimpact variable information printer, or web tinter can be attached. Electronic web-tension devices, web-guide sensors, and reinserters of preprinted web are used as auxiliary equipment. In-line sheeters allow form producers to compete by extending the cut-sheet laser and ink-jet market. Certain form-printing machines offer custom-built commercial jaw folders to produce complete printed parts. Certain security labels have a complex construction (see Applications of Pressure-Sensitive Products, Chapter 4). Their conversion includes a range of operations and requires special equipment.
Strip Shape: Its Measurement and Control
Published in William L. Roberts, Cold Rolling of Steel, 2017
Shape defects may be enhanced by subsequent shearing or slitting of a workpiece. A rolled product that may appear to be of acceptable shape but possessing a slight fullness just within an edge may develop an unacceptable wavy edge when sidetrimmed. Strip, that may appear satisfactory in long lengths uncoiled on a flat surface, may sometimes be sheared into sheets which have a tendency to curl. This effect is decidedly disadvantageous where sheet or strip is to be sheared and stacked for further processing, as in can manufacture. Under these circumstances, shape defects, such as coil set, twist and crossbow, make it difficult for the sheared pieces to be successfully fed to punch presses and other machines in a sequential manner without jamming the machines.
Use of Conventional Manufacturing Techniques for Materials
Published in T. S. Srivatsan, T. S. Sudarshan, K. Manigandan, Manufacturing Techniques for Materials, 2018
T. S. Srivatsan, K. Manigandan, T. S. Sudarshan
Cracks span both fine microscopic and macroscopic, and can be either zipper cracks at the center of the structure (Figure 14.36b) or edge cracks (Figure 14.36c). This is due to the low ductility of the material at the rolling temperature. The quality of edges of the rolled sheet is important should additional forming operations be required. This then has necessitated the need for removal of the edge defects in rolled sheets using shearing and even slitting operations. Alligatoring (shown in Figure 14.36d) is caused because of non-uniform bulk deformation experienced by the billet during rolling or by the presence of a sizeable number of defects in the original cast structure.
Fault diagnosis method for disc slitting machine based on wavelet packet transform and support vector machine
Published in International Journal of Computer Integrated Manufacturing, 2020
Yiwei Zhu, Qiusheng Yan, Jiabin Lu
The shearing of sheet metal mainly includes two modes, i.e. disc slitting and transverse slant shearing. During disc slitting, the sheet metal is under the action of two-disc blades with up-and-down staggered configuration. In this way, a roll of sheet metal can be cut into metal strips with specific widths or undergo a trimming process. Disc slitting is currently the most cost-effective method for sheet metal shearing (Dasgupta 1989). Disc slitting machines are widely used in many fields, such as the manufacture of substation equipment, IC connectors, home appliances, and automobiles.