eTheses Repository

Automated visual inspection for the quality control of pad printing

Freear, Nicholas David (2002)
Ph.D. thesis, University of Birmingham.

PDF (30Mb)


Pad printing is used to decorate consumer goods largely because of its unique ability to apply graphics to doubly curved surfaces. The Intelpadrint project was conceived to develop a better understanding of the process and new printing pads, inks and printers. The thesis deals primarily with the research of a printer control system including machine vision. At present printing is manually controlled. Operator knowledge was gathered for use by an expert system to control the process. A novel local corner- matching algorithm was conceived to effect image segmentation, and neuro-fuzzy techniques were used to recognise patterns in printing errors. Non-linear Finite Element Analysis of the rubber printing-pad led to a method for pre-distorting artwork so that it would print undistorted on a curved product. A flexible, more automated printer was developed that achieves a higher printing rate. Ultraviolet-cured inks with improved printability were developed. The image normalisation/ error-signalling stage in inspection was proven in isolation, as was the pattern recognition system.

Type of Work:Ph.D. thesis.
Supervisor(s):Shippen, James M.
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Department of Manufacturing and Mechanical Engineering
Keywords:machine vision, visual inspection, quality control, pad printing, tampo-graphic, OCAP, cliché, Tampondruckmaschinen, Tampondruck
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:890
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
Export Reference As : ASCII + BibTeX + Dublin Core + EndNote + HTML + METS + MODS + OpenURL Object + Reference Manager + Refer + RefWorks
Share this item :
QR Code for this page

Repository Staff Only: item control page