Dry lamination is a well-established composite technology and remains the dominant process in China's flexible packaging industry. Solvent-free lamination, on the other hand, is an environmentally friendly technique that represents the future of composite manufacturing. It has already gained widespread adoption in many developed countries and regions. For companies in the flexible packaging sector to successfully implement both methods, it is essential for managers and technicians to fully understand the key differences between them.
Differences in Technical Principles
The main distinction lies in the coating method, the mechanism of film formation, the adhesion strength during lamination, the drying and cooling processes, and the curing procedure. In dry lamination, solvents are used to dissolve the adhesive, which are then evaporated during drying. In contrast, solvent-free lamination uses adhesives that do not require evaporation, making the process more energy-efficient and eco-friendly.
Differences in Process Parameters
The process parameters vary significantly between the two techniques. These include the amount of adhesive applied, the curing temperature, the lamination pressure, belt tension, drying temperature, coating roll temperature, lamination roll temperature, cooling roll settings, winding uniformity, and ambient humidity. Each parameter plays a critical role in determining the quality and performance of the final product.
Differences in Appearance Quality
When it comes to appearance, there are visible differences between solvent-free and dry lamination products. These differences are largely due to the nature of the composite process itself. For instance, solvent-free laminates often have a smoother surface and better clarity, while dry laminates may exhibit slight texture or unevenness depending on the adhesive application and drying conditions.
Application Scope
Although solvent-free lamination cannot fully replicate the performance of dry lamination in certain complex structures, specific internal materials, or special applications, it is suitable for most general-purpose packaging needs. As environmental regulations become stricter, the use of solvent-free technology is expected to grow even further.
This content is sourced from Keyin Media. Printing Technology ·Packaging and Decoration 》2012, Issue 16, for more journal content, please visit the journal channel .
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