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How to solve the foaming problem of TPU hot melt adhesive film during lamination?
​The main factors that affect the bonding effect of cast TPU hot melt adhesive film are selection and operation. Common bonding problems include degumming, weak bonding force, bubbles after bonding, etc. Debonding and weak bonds can be a matter of choice. Bubbles after bonding are mainly caused by problems during the operation.
2023-09-15
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How to solve the foaming problem of TPU hot melt adhesive film during lamination?

    The main factors that affect the bonding effect of cast TPU hot melt adhesive film are selection and operation. Common bonding problems include degumming, weak bonding force, bubbles after bonding, etc. Debonding and weak bonds can be a matter of choice. Bubbles after bonding are mainly caused by problems during the operation.

    Regardless of TPU hot melt adhesive film or hot melt mesh adhesive material, the main reason for bubbling is that the air cannot be discharged. This situation is very common in the application of non-breathable product materials such as films. Due to non-breathable product materials such as films, the air accumulated on the surface during the bonding process cannot be discharged like non-woven materials.

    Therefore, during the lamination process of the TPU hot melt adhesive film, if the entire surface is directly pressed, the air in the middle will easily accumulate, and the TPU hot melt adhesive film will easily bubble after lamination. The solution to this type of foam caused by air buildup is to slowly heat and compress the material from one side with a roller compressor or iron. In this way, the air in the middle can be continuously discharged through the surroundings, and there will be no air accumulation and foaming after bonding.

    The reason for foaming after bonding is not only the accumulation of air that cannot be discharged, but also the foaming caused by secondary heating. This situation is very common in materials and industries that require secondary composite technology. This material usually does not bubble when bonded for the first time, but because the TPU hot melt adhesive film will be melted again by the second heating, if there is no certain pressure, it will cause the product to bubble.

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TPU hot melt adhesive film vs anaerobic adhesive: "Scene flexibility" difference in automotive interior bonding
2025-09-11
​From the perspective of curing conditions, TPU hot melt adhesive film does not need to rely on special environments, while anaerobic adhesives are severely restricted by "auerobicity". The curing principle of anaerobic glue is to undergo polymerization under conditions of lack of oxygen and catalyzed by metal ions (such as iron and copper). If it is in an environment where air circulation or metal substrates are not available, the curing speed will be greatly slowed down or even unable to cure. In automotive interiors, most bonding scenarios are "open" (such as bonding the door panel skin to PP substrate, and the ceiling fabric to the sponge), the air can freely contact the bonding surface, and the substrate is mostly non-metallic (PP, ABS, fabric, etc.), lacking metal ion catalysis, and additional catalyst is required when using anaerobic glue, and the curing time is as long as several hours, which is difficult to meet the needs of industrial production. The TPU hot melt adhesive film only needs to be melted by heating (120-160℃) and can be cured after pressurization and cooling. It does not need to rely on the ambient oxygen concentration or the base material. It can be cured stably in open or closed bonding scenarios, and the curing time only takes a few dozen seconds to a few minutes, adapting to the fast-paced needs of the interior production line.
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