Abstract
Polymer-coated steel (PCS) is a new type of metal packaging material under development, which has better performance in saving resources, energy, and environmental protection. The lamination process has an important influence on the bonding quality of the PCS interface. PCS samples under different lamination temperatures and lamination speeds were prepared through experiments. A binding rate is defined to represent the real bonding area of the PCS interface. The micro-scratch tester and scanner are used to study the influence of the lamination process on the bonding rate and bonding strength of the PCS interface. It is proposed that the bonding rate and bonding strength of the PCS interface increases with the increase of lamination temperature and increases with the decrease of lamination speed. The PCS interface bonding rate and bonding strength are positively correlated. SEM and DSC experiments revealed the cause of bubbles on the PCS surface. It is proposed that controlling the uniformity of the TFS surface temperature can reduce the quality defects of PCS surface bubbles. Relevant research results bring guiding significance for the formation of enterprises.
Highlights
With the gradual development of the metal packaging industry in the direction of green, energy saving, and environmental protection, more and more attention has been paid to the surface-coating technology of metal products
From the perspective of the bonding quality of the Polymer-coated steel (PCS) interface, this paper proposes an index that characterizes the true bonding area of the PCS interface—the bonding rate
The non-wetting behavior of the steel by molten polyethylene terephthalate (PET) is the cause of the bubble formation
Summary
With the gradual development of the metal packaging industry in the direction of green, energy saving, and environmental protection, more and more attention has been paid to the surface-coating technology of metal products. The cause of bubbles on the surface of the coated sample may be the low melting thickness of the polymer film, and the faster coating speed reduces the heat transfer time at the film/iron interface and increases the instability of the surface temperature of the chrome-plated steel strip. On the contrary, when the coating speed is low, the increase of heat transfer time at the film/iron interface makes PET easier to melt, the number of bubbles on the surface of PCS decreases and the binding rate increases. It can be concluded that the critical load of this coated sample is about 2.5 N
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