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Why does TPU hot melt adhesive film fall off easily?
Due to its high elasticity, TPU hot melt adhesive film is recognized by a wide range of industries. It not only achieves strong bonding, but can also adapt to the bonding needs of a variety of materials.
2023-09-18
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Why does TPU hot melt adhesive film fall off easily?

    Due to its high elasticity, TPU hot melt adhesive film is recognized by a wide range of industries. It not only achieves strong bonding, but can also adapt to the bonding needs of a variety of materials.

    Polyurethane's outstanding comprehensive elastic properties are unmatched by other materials. It can be synthesized according to processing requirements and can be processed by any conventional process of most polymer materials. Therefore, its products are widely used and cover almost all fields.

    In fact, many customers have been asking this question, wondering why the TPU hot melt adhesive film is not strong. After we have comprehensively sorted out the needs of these customers, we can basically explain the reasons why the hot melt adhesive film is not strong. It is summarized in the following aspects and is shared here for your reference.

    First of all, we need to consider the quality of TPU hot melt adhesive film. If we purchase some TPU hot melt adhesive film products produced by small factories, it is very likely that the bonding effect will be poor due to substandard product quality. The technical requirements required to manufacture TPU hot melt adhesive film are not as simple as people think. It has high requirements on the production environment. Once the production environment changes significantly, the quality of TPU hot melt adhesive films produced in the same batch will vary greatly.

    It is also possible that the wrong model of TPU hot melt adhesive film was selected, causing it to be incompatible with composite materials. At present, there is no TPU hot melt adhesive film suitable for composite use of all materials. Therefore, if you choose incorrectly, you may end up with a bond that is not strong enough.

    In addition to the reasons for the quality of the TPU hot melt adhesive film and the selection of raw materials, there may also be problems with the composite equipment itself. For example, if the lamination equipment is too old and cannot meet the use needs of TPU hot melt adhesive film, it will lead to insufficient melting of the film, resulting in weak bonding strength.

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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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