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How to deal with the poor adhesion of TPU hot melt adhesive film?
​TPU hot melt adhesive film is a kind of colloidal substance that is widely used at present. It can play a very good bonding effect whether it is for some similar materials or composites of different materials. Although compared with general glue products, the adhesive film has a much better bonding effect when compounding objects, but the final bonding effect will still be different due to different materials and different types of the adhesive film itself. . When the adhesion of the TPU hot melt adhesive film is not good, how to deal with it? Let's take a look at it together. The problem of poor adhesion of TPU hot melt adhesive film may be related to the following reasons.
2023-07-13
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How to deal with the poor adhesion of TPU hot melt adhesive film?

    TPU hot melt adhesive film is a kind of colloidal substance that is widely used at present. It can play a very good bonding effect whether it is for some similar materials or composites of different materials. Although compared with general glue products, the adhesive film has a much better bonding effect when compounding objects, but the final bonding effect will still be different due to different materials and different types of the adhesive film itself. . When the adhesion of the TPU hot melt adhesive film is not good, how to deal with it? Let's take a look at it together. The problem of poor adhesion of  TPU hot melt adhesive film may be related to the following reasons.

    First of all, the quality of the TPU hot melt adhesive film itself may be abnormal. There are many manufacturers of TPU hot melt adhesive films on the market. If the quality of the purchased adhesive film is not up to standard, or the production environment changes, even the same batch of products will have quality differences.

    Secondly, the selected TPU hot melt adhesive film model may not meet the requirements. In the composite bonding process, if the selected TPU hot melt adhesive film model is not suitable, it may not be compatible with the composite material, resulting in weak bonding effect. Therefore, when choosing TPU hot melt adhesive film, be sure to pay attention to the choice of model.

    Third, the abnormality of the composite equipment may also lead to poor bonding effect. Some obsolete composite equipment may lead to problems such as material composite conditions not up to standard, TPU hot melt adhesive film cannot be fully melted, etc., which will affect the bonding effect.

    It should be noted that the high temperature resistance of TPU hot melt adhesive film is not the same as its melting point, and these two concepts need to be distinguished. In addition, the composite bonding temperature of different materials is quite different, so it is necessary to pay attention to temperature regulation. In order to obtain a good bonding effect, it is recommended to pay more attention to the selection of TPU hot melt adhesive film, temperature control and maintenance of equipment.

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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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