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How does the TPU hot melt adhesive film work
​TPU hot melt adhesive film is a kind of TPU film and also a kind of adhesive. When it comes to glue, everyone must know that glue is used to bond things. However, people's impression of glue is often liquid, and it must be sticky to the touch. Is this kind of plastic film slippery to the touch really glue? How can TPU hot melt adhesive film​ stick things? Many people may have such doubts. Here Tepuyou explains how the TPU hot melt adhesive film plays a bonding role
2022-11-17
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How does the TPU hot melt adhesive film work

    TPU hot melt adhesive film is a kind of TPU film and also a kind of adhesive. When it comes to glue, everyone must know that glue is used to bond things. However, people's impression of glue is often liquid, and it must be sticky to the touch. Is this kind of plastic film slippery to the touch really glue? How can TPU hot melt adhesive film stick things? Many people may have such doubts. Here Tepuyou explains how the TPU hot melt adhesive film plays a bonding role

    Mechanical combination

    The adhesion between TPU hot melt adhesive film and the adherend is mechanical adhesion. After the adhesive is applied on the bonding surface, because the TPU hot melt adhesive film penetrates into the pores of the adherent, and then it is dried, so that the sliding friction between the TPU hot melt adhesive film and the adherent can be generated to increase the mutual adhesion.

    Interdiffusion

    The adhesion between polymer materials and chemicals is due to the diffusion of biopolymer itself or its chain segments through thermal movement. In essence, the interface is mutually dissolved, and then the TPU hot melt adhesive film is generated to interweave with the adherent molecules to form a firm bond. The diffusion rate is related to temperature and pressure.

    Chemical reaction

    The chemical crosslinking of TPU hot melt adhesive film reflects the interface between the film and the adherent, and the combination of hydrogen bond, coordination bond and chemical bond.

    The main component of TPU hot melt adhesive film is polyurethane. This material has different properties according to its high melting point and low melting point. The color of TPU hot melt adhesive film with medium temperature and high temperature melting point is transparent and elastic. The higher the melting point, the better the elasticity and transparency of TPU hot melt adhesive film; The low temperature TPU hot melt adhesive film is white and translucent, and has no elasticity. The above explains how the TPU hot melt adhesive film plays a bonding role. If you want to know more, you can browse our other articles or call us directly.

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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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