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TPU hot melt adhesive film has many different performance requirements
​TPU hot melt adhesive film has many different performance requirements, one of which is water resistance, and among these requirements, water resistance may be the most mentioned. For the garment industry, the washing resistance of TPU hot melt adhesive film​ is particularly important, because this performance will affect the durability of clothing when using TPU hot melt adhesive film for seamless bonding.
2023-05-10
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TPU hot melt adhesive film has many different performance requirements

    TPU hot melt adhesive film has many different performance requirements, one of which is water resistance, and among these requirements, water resistance may be the most mentioned. For the garment industry, the washing resistance of TPU hot melt adhesive film is particularly important, because this performance will affect the durability of clothing when using TPU hot melt adhesive film for seamless bonding.

    In layman's terms, the washability refers to the performance of materials (usually fabrics) that can maintain high bonding strength after being bonded by TPU hot melt adhesive film, soaked in water at a certain temperature and rubbed repeatedly.

    The hot-melt adhesive films with better washing resistance are TPU hot melt adhesive films and PO hot-melt adhesive films. Since they are often used in the field of clothing, there are usually certain requirements for the softness of hot-melt adhesive films. Films are more commonly used. In addition, EVA hot-melt adhesive film with a wide range of applications also has a certain degree of water resistance, but the effect is not as good as TPU hot melt adhesive film.

    There are different grades of washing resistance, including washing at room temperature, washing at 60°C, washing at 90°C, etc. As the temperature increases, the requirements for the washing resistance of the hot melt adhesive film are also higher. Taking TPU hot melt adhesive film as an example, most TPU hot melt adhesive films can withstand washing at room temperature, but not all TPU hot melt adhesive films can withstand washing at 60°C.

    A key problem with hot melt adhesive films is that they have a melting point. The initial melting point of many types of hot melt adhesive films may be lower than 60°C, and TPU hot melt adhesive films are no exception. Therefore, when the water temperature reaches 60°C, the adhesive film of the bonding material has actually begun to melt, and they cannot withstand the erosion of water.

    Therefore, when carrying out the test under the condition of washing at 90°C, the requirements are more stringent. Most TPU hot melt adhesive films may not meet this requirement, so a special formula with high temperature resistance is required to meet the demand

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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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