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How to solve the problem of TPU hot melt adhesive film foaming during lamination?
​Factors affecting the bonding effect of cast TPU hot melt adhesive film​ mainly include selection and operation. Common bonding problems include degumming, weak adhesion, and bubbles after bonding. Debonding and weak adhesion are most likely a selection issue. Bubbles after bonding are mainly due to problems in operation.
2023-08-29
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How to solve the problem of TPU hot melt adhesive film foaming during lamination?

    Factors affecting the bonding effect of cast TPU hot melt adhesive film mainly include selection and operation. Common bonding problems include degumming, weak adhesion, and bubbles after bonding. Debonding and weak adhesion are most likely a selection issue. Bubbles after bonding are mainly due to problems in operation.

    Nylon mesh belt is a release paper TPU hot melt adhesive film belt for clothing.

    Whether it is TPU hot melt adhesive film bonding or hot-melt mesh bonding materials, the main reason for blistering is that the air cannot be vented. 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 trapped on the surface during bonding cannot escape like non-woven materials.

    Therefore, during the lamination process, if the entire surface is directly pressed, the air in the middle is likely to accumulate, which will easily cause blisters after lamination. For this kind of air bubbles caused by air accumulation, the solution is to use a roller laminating machine or an iron to slowly heat and pressurize the material from one side of the TPU hot melt adhesive film. In this way, the air in the middle can be continuously discharged through the surroundings, and there will be no air accumulation and air bubbles after bonding.

    The cause of air bubbles after bonding is not only the pressure build-up caused by the inability of air to escape, but also the foaming phenomenon caused by secondary heating. This is very common in materials and industries that require secondary compounding techniques. Usually, there will be no air bubbles when the material is bonded for the first time, but because the TPU hot melt adhesive film needs to be used for remelting during the second heating, if a certain pressure is not applied, the product may produce air bubbles.

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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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