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What should I do if the TPU hot melt adhesive film does not melt?
TPU hot melt adhesive film​ has been used in many industries, such as footwear and clothing industries. In fact, different industries have different requirements for TPU hot melt adhesive films, and the specific processes are also different. How to make the TPU hot melt adhesive film obtain a strong bonding effect is a problem that many users care about.
2021-12-08
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What should I do if the TPU hot melt adhesive film does not melt?

TPU hot melt adhesive film has been used in many industries, such as footwear and clothing industries. In fact, different industries have different requirements for TPU hot melt adhesive films, and the specific processes are also different. How to make the TPU hot melt adhesive film obtain a strong bonding effect is a problem that many users care about.

This is because every material has a temperature range that it can withstand. Some materials can withstand high temperatures, and some materials can withstand low temperatures. When the temperature resistance of our material itself is not high, it is easy to be deformed by heat. When we choose TPU hot melt adhesive film to bond this material, we must consider this temperature condition. If the melting temperature of the selected TPU hot melt adhesive film is close to the temperature resistance temperature of the material to be adhered, the material will become soft even if the TPU hot melt adhesive film melts. Compression deformation, so it is not bonding, and the material is directly scrapped.

The melting temperature of different specifications of hot melt adhesive film is different, that is, there are high temperature and low temperature. If the heating temperature is higher than the temperature required for the hot-melt adhesive film, the TPU hot-melt adhesive film will melt too fast or too much, so that the glue will easily penetrate into the material to be glued. Especially in some textile fields, if the temperature is too high, the glue will penetrate a little and affect the bonding effect.

The processing of TPU hot melt adhesive film generally needs to be heated to a suitable temperature. Usually the softening temperature of TPU hot melt adhesive film is above 80 degrees. When we heated to this temperature, the TPU hot melt adhesive film began to soften without fusion.

Temperature and pressure are the two basic factors for TPU hot melt adhesive film to obtain good adhesion, and another important factor is the hot pressing time. Because it takes time to heat the TPU hot melt adhesive film, it also takes time to spread the TPU hot-melt adhesive film on the surface of the adherend after melting. The hot pressing time is too long, the adhesive penetrates too much, the hot pressing time is too short, the TPU hot melt adhesive film is not spread well, and the time is too long or too short to be effective.

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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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