Effect of Tinplate Surface Morphology on Wear Resistance of Milk Powder Can Forming

FANG Yuan; QI Wei; WAN Yiqun; SHEN Pengjie; CHEN Yimin; ZHANG Mei

doi:10.19554/j.cnki.1001-3563.2026.17.016

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (17) : 145-154. DOI: 10.19554/j.cnki.1001-3563.2026.17.016

Advanced Materials

Effect of Tinplate Surface Morphology on Wear Resistance of Milk Powder Can Forming

FANG Yuan^1,2, QI Wei^3,*, WAN Yiqun², SHEN Pengjie², CHEN Yimin², ZHANG Mei⁴

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Abstract

During the flanging process of tinplate for milk powder cans, tin residues remain on the mold surface and transfer reciprocally between the mold and can bodies. To address the issue of frequent cleaning of molds by staff and to prevent contamination of contents by tin residues, the work aims to investigate the effect of the surface morphology of tinplate on wear resistance of milk powder can forming. The worn morphology at the flanging position of the milk powder can was observed with a scanning electron microscope. The tin residues on the mold surface were tested with an X-ray diffractometer. The damage caused by the force acting on the tin layer was simulated with the Ansys software. The friction and wear effect during the flanging process was simulated with a friction tester. The tin shedding rate of the tinplate with different surface morphologies was tested with an electrochemical method. The wear of the flange mold on the tin layer with a tin coating weight of 2.8 g/m² caused the tin layer to break, fall off and expose the alloy layer. The poor wear resistance of the tinplate essentially resulted from the adhesive wear and abrasive wear of the tin layer between the substrate and the flange mold. By adjusting the R_sk value on the surface morphology of the tinplate to make it positive, the actual contact area between the flanging ball and the tinplate could be reduced, thereby minimizing the friction and wear of the tin layer. By modifying the electrical discharge texturing and rolling process of the tinplate, the R_sk value in the surface morphology of the tinplate increased from -1 to 0.5. This results in a 30% reduction in the tin shedding rate of the tinplate with a tin coating weight of 2.8 g/m², which is beneficial for reducing the probability of tin residue during the can flanging process with the tinplate, reducing the frequency of mold wiping, and ensuring food safety.

Key words

tinplate / can flanging process / tin residue / wear resistance / surface morphology

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FANG Yuan, QI Wei, WAN Yiqun, SHEN Pengjie, CHEN Yimin, ZHANG Mei. Effect of Tinplate Surface Morphology on Wear Resistance of Milk Powder Can Forming[J]. Packaging Engineering. 2026, 47(17): 145-154 https://doi.org/10.19554/j.cnki.1001-3563.2026.17.016

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