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In book production, high-speed inkjet printing (HSI printing) is the most important digital printing process and perfect binding the most common binding process. HSI printing brings new types of uncoated paper into the bookbinding industry. These papers must be reliably evaluated for their perfect binding capability in order to make technically and economically optimal decisions for processing.
Solution steps
In the first step, the test papers are characterized by means of selected paper tests. From these data, a mathematical prediction model is developed, which is compared with the results of the laboratory methods as well as craft and industrial perfect binding tests in an iterative process.
The laboratory methods deal with sheet edge roughening and sheet edge binding. It is investigated whether a statement on the achievable binding strength can already be made without sheet edge roughening (percentage binding strength). In the case of sheet edge roughening, the efficiency and the susceptibility to faults (e.g. sealing effect at the sheet edge) are to be evaluated. The laboratory method for sheet edge binding should provide a procedure that can be produced and tested as reproducibly as possible.
Another research approach addresses the specific process-related influences in HSI printing on the achievable perfect binding quality. The main factors to be investigated are moisture penetration into the paper, waiting times between printing and binding, and HSI-specific block formation.
Targeted results
In the research project, a prediction model for the perfect binding quality of a paper is to be developed, which is based on material parameters and verified by laboratory and industrial tests. The aim is to contribute to a more databased production in order to replace the trial-and-error principle that is still frequently encountered.