UBC Theses and Dissertations
Study of corrugated board cutting by high velocity liquid jet Szymani, Richard
The application of high velocity liquid jets for corrugated board cutting was investigated as a possible new method of slitting operations. Eleven types of corrugated board ranging from 91 pounds per 1,000 square feet board weight (125 psi - nominal burst test) to 297 pounds per 1,000 square feet (350 psi - burst test) were selected for the study. Plain water or water with polymer additive were used as the cutting fluids. The conditions under which cutting of corrugated boards was carried out were as follows: nozzle diameters 0.0082 and 0.0102 in., pressure levels 20,000, 30,000 and 40,000 psi; feed rates 300, 500 and 700 fpm. The obtained results indicate that slitting speeds with high velocity liquid jets are well above those achievable by the existing conventional methods. It has also been shown that the use of a low concentration of polyethylene oxide (Polyox WSR - 301) resulted in a marked increase in cutting efficiency as compared with plain water. Measurements of liquid retention after cutting.-have shown that wetting of corrugated boards during the cutting operation is insignificant and as such can be neglected. It has been demonstrated that the edgewise compression strength of corrugated board, cut with the liquid jet, is almost twice that cut with the typical conventional slitter. Based on the analysis of scanning electron micrographs it has been observed that the principal failure mechanism during cutting with high velocity liquid jet involves breaking of the interfibre bond with resulting separation of fibres. Corrugated board cutting with high velocity liquid jets has been found to eliminate crushing and tearing of the board as well as dust generation. The concept provides a means to reduce trim waste and particle contamination. Jet cutting is ideally suited for numerically controlled systems and appears to lend itself for adaptation to commercial application.
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