High-temperature melt-film iron technology: A technological breakthrough in green packaging
Jan 10,2022
The high-temperature melt film lamination process is an innovative technology in the field of metal packaging in recent years. It utilizes high-temperature technology to tightly bond plastic film with metal substrates, combining the strength of metal with the barrier properties of plastic, and has become a core direction for the upgrading of the packaging industry.
The process flow is akin to precise "ingredient cooking", requiring precise control at every step. Firstly, the substrate undergoes uncoiling, cleaning, and drying. The rolled chrome-plated cold-rolled steel sheet is placed on the uncoiler and fed into the cleaning and drying system through guide rollers. It is first blown and rinsed with clean compressed air at 1.5 - 5kg/cm² to remove surface dust, then enters a sodium hydroxide solution tank at 40 - 80℃ and a concentration of 0.1% - 5% to remove oil stains. Next, it is cleaned of residual alkali solution in a pure water tank, and finally dried in an infrared oven to ensure the substrate surface is "spotless".
After cleaning, the crucial high-temperature melting process follows. By precisely controlling the temperature, the film achieves "molecular bonding" with the substrate. This strong bond prevents film detachment during packaging transportation and processing, ensuring product quality stability from the source. Compared to low-temperature adhesive laminated iron, high-temperature melted laminated iron exhibits significantly higher adhesion. Additionally, it possesses deep-drawing and wear-resistant properties, making it less prone to damage during metal can stamping and forming. This makes it particularly suitable for the production of complex shapes such as irregular cans and stretch cans.
Excellent environmental performance is a major highlight of the high-temperature fusion laminated iron process. During production, there is no use of epoxy resin coatings for painted iron, nor is there a need for adhesives for low-temperature lamination, thereby eliminating the risk of migration of harmful substances such as Bisphenol A from the source. Additionally, there is no solvent or exhaust gas emission, and lower energy consumption, fully meeting the development needs of green packaging. Currently, laminated iron has secured a certain market share in packaging materials such as DRD stamped cans, DI drawn cans, two-piece cans, shaped cans, easy-open lids, and easy-tear lids, making it a general trend to replace traditional painted iron.
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