Mixing doctor blades of different widths on standard blade holders often leads to variations in process stability in inline gravure printing. The work aims to investigate the influence of effective cantilever length on the structural stiffness and wear behavior of doctor blades, and provide guidance for blade selection and installation. Taking a standard blade holder commonly used in inline gravure presses as the research object, three-dimensional finite element models of 40 mm and 45 mm doctor blades were established. Static analyses were carried out under contact pressures ranging from 0.2 to 0.6 MPa, and the numerical results were further verified using wear data collected from actual production. The simulations showed that, under the installation constraints of a standard blade holder, the effective cantilever length of the 45 mm doctor blade increased by approximately 5 mm. At the ultimate pressure of 0.6 MPa, the maximum deformation of the 45 mm doctor blade reached about 1.6 times that of the 40 mm doctor blade. Under the same pressure conditions, the 40 mm doctor blade exhibited lower deformation sensitivity and more stable wear response. Field observations also revealed that the wear distribution of the 45 mm doctor blade was more dispersed and was more prone to wave-shaped abnormal wear. These results suggest that the effective cantilever length is a key factor affecting the process stability of doctor blades in standard blade holder systems. Within the operating conditions considered in this study, the shorter cantilever of the 40 mm doctor blade provides higher structural stiffness and more stable process performance. For medium-to-high load conditions, a shorter cantilever installation scheme is therefore recommended, or the effective cantilever length should be controlled through adjustment of the supporting structure.
Key words
inline gravure press /
doctor blade /
finite element analysis /
process stability
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