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Working time of TPU hot melt adhesive film
TPU hot melt adhesive film is an efficient and environmentally friendly adhesive widely used for bonding various materials, such as plastics, metals, glass, etc. It is made from thermoplastic polyurethane as the substrate, with the addition of other additives and fillers. So, how long does the working time of TPU hot melt adhesive film last? This article will provide a detailed introduction.
2023-12-11
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Working time of TPU hot melt adhesive film

    TPU hot melt adhesive film is an efficient and environmentally friendly adhesive widely used for bonding various materials, such as plastics, metals, glass, etc. It is made from thermoplastic polyurethane as the substrate, with the addition of other additives and fillers. So, how long does the working time of TPU hot melt adhesive film last? This article will provide a detailed introduction.

    Firstly, let's understand the working principle of TPU hot melt adhesive film. When the TPU hot melt adhesive film is heated at high temperatures, it becomes fluid and sticky. During the bonding process, it tightly connects two bonded materials together and forms covalent bonds through chemical reactions, achieving a permanent bonding effect.

    So, how long does the working time of TPU hot melt adhesive film last? In fact, the working time of TPU hot melt adhesive film depends on multiple factors, including the material of the bonded material, thickness, surface treatment, working environment temperature and humidity, etc. Therefore, it is not possible to provide an exact time range.

    Generally speaking, the curing speed of TPU hot melt adhesive film is relatively fast, and it can be bonded within a few minutes. However, to ensure adhesion and durability, it is usually necessary to allow the TPU hot melt adhesive film to cool naturally at room temperature and cure for a period of time. This period usually lasts from a few hours to a day, depending on factors such as the material and thickness of the bonded material.

    In addition, it should be noted that when using TPU hot melt adhesive film for bonding, the following points should be noted:

    The surface of the bonded material should be clean and free of oil, moisture, and other impurities. Otherwise, it will affect the bonding effect and durability.

    During the bonding process, the hot melt adhesive film should be evenly applied to the surface of the bonded material and the two materials should be quickly bonded together. Otherwise, it may lead to weak adhesion or defects such as bubbles.

    After bonding, the hot melt adhesive film should be allowed to cool naturally at room temperature and cure for a period of time. This period usually lasts from a few hours to a day, depending on factors such as the material and thickness of the bonded material.

    During use, attention should be paid to safety. The hot melt adhesive film has high temperature and viscosity after heating, and should avoid scalding or contaminating the surrounding environment.

    In summary, TPU hot melt adhesive film is an efficient and environmentally friendly adhesive widely used for bonding various materials. During use, it is necessary to pay attention to factors such as the material, thickness, surface treatment, working environment temperature and humidity of the bonded material, and follow the correct operating procedures. Only in this way can the bonding effect and durability be guaranteed.

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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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