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The Guiding Significance of Melt Index Parameters of TPU Hot Melt Adhesive Film to Process
TPU hot melt adhesive film is an environmentally friendly product manufactured by coating process, which has very strong adhesion, high elasticity and washability. TPU hot melt adhesive film has a wide bonding range and a wide range of hardness, which is very suitable for various temperature resistance requirements and can perfectly keep clothes from deforming. TPU hot melt adhesive film also has a wide rebound range, strong anti-yellowing performance and excellent bonding effect.
2023-04-28
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The Guiding Significance of Melt Index Parameters of TPU Hot Melt Adhesive Film to Process

    TPU hot melt adhesive film is an environmentally friendly product manufactured by coating process, which has very strong adhesion, high elasticity and washability. TPU hot melt adhesive film has a wide bonding range and a wide range of hardness, which is very suitable for various temperature resistance requirements and can perfectly keep clothes from deforming. TPU hot melt adhesive film also has a wide rebound range, strong anti-yellowing performance and excellent bonding effect.

    Melt index is also called melt index (MI, meltindex), also called melt flow rate (Meltmass-flowrate, referred to as MFR, melt mass flow rate). It is measured by a standardized melt index meter. When measuring, under a certain temperature and a certain pressure, the resin melt passes through a standard capillary tube, and the number of grams of the melt that flows out within 10 minutes is generally recorded, and the unit is g/10min.

    Through the understanding of the definition and measurement method of melting point, we can know that the function of melting point is to evaluate the flow ability of TPU hot melt adhesive film after melting. The higher the melting point of the TPU hot melt adhesive film, the better the fluidity of the melted glue; on the contrary, the lower the melting point of the TPU hot melt adhesive film, the worse the fluidity after melting into the glue.

    After understanding the meaning of the melt finger, you can understand its influence on the use process of TPU hot melt adhesive film. We know that the TPU hot melt adhesive film with better fluidity after melting is more like a liquid, the glue is easy to be pushed away, and the permeability is stronger. When using a hot-melt adhesive film with a high melting index, a smaller hot-pressing pressure and a shorter hot-pressing time are required. On the contrary, when using a TPU hot melt adhesive film with a low melt index, due to its poor fluidity, the glue cannot be easily pushed away, so a higher hot pressing pressure and a longer hot pressing time are required.

    TPU hot melt adhesive film has an important parameter called melt index, which is as important as melting range, and has a great guiding effect on the use process of TPU hot melt adhesive film. I believe everyone now realizes the importance of melting index parameters, right? If you encounter any problems when using TPU hot melt adhesive film, welcome to consult us.

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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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