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Why is the bonding effect of TPU hot melt adhesive film poor?
​TPU hot melt adhesive film belongs to a special type of adhesive. There are many TPU hot melt adhesive film manufacturers on the market. The types of adhesive films produced by different manufacturers are quite different, and they are applied to the compounding of different materials. There will be a big difference in the strength of its viscosity. So how long can the stickiness of TPU hot melt adhesive film last, and can it always exist? Let's take a look together.
2023-07-03
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Why is the bonding effect of TPU hot melt adhesive film poor?

    TPU hot melt adhesive film belongs to a special type of adhesive. There are many TPU hot melt adhesive film manufacturers on the market. The types of adhesive films produced by different manufacturers are quite different, and they are applied to the compounding of different materials. There will be a big difference in the strength of its viscosity. So how long can the stickiness of TPU hot melt adhesive film last, and can it always exist? Let's take a look together.

    During the application of TPU hot melt adhesive film for material compounding, it is necessary to heat the adhesive film to a certain temperature in order to make its adhesiveness better. If the temperature during compounding is not up to standard, it will easily affect the entire bonding effect. Under normal circumstances, the old-fashioned drum compound machine has a relatively large contact area on the entire drum surface and a relatively fast heat dissipation rate, and the compound temperature is prone to fail to meet the standard during subsequent compounding. For this kind of problem, it is often required that the temperature of the equipment is higher than the melting point of the general film.

    The temperature, time and pressure required to melt the TPU hot melt adhesive film are not enough

    TPU hot melt adhesive film is in a solid state at room temperature. In the follow-up composite treatment with the help of it, if the adhesive film cannot be fully melted and the adhesive effect can be effectively exerted, it may be related to factors such as low temperature and insufficient operating pressure during the processing of the adhesive film. The technical staff of the TPU hot melt adhesive film manufacturer said that different types of TPU hot melt adhesive films have different melting points when they are melted. Therefore, if the film cannot be fully melted, the melting conditions can be adjusted appropriately to see if the film can be fully melted.

    It can be seen that, for those who need to purchase TPU hot melt adhesive film, when choosing a partner among many TPU hot melt adhesive film manufacturers, when choosing the appropriate type of adhesive film, it is necessary to consider many aspects, not simply It is better to judge whether it is worth buying according to the index of its adhesive film adhesion, so that it is easier to buy satisfactory adhesive film products.

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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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