The working adhesion strength of TPU hot melt adhesive film refers to its adhesion to the adhesion to the object to be adhered at a specific temperature and pressure. Due to its excellent adhesion performance and durability, TPU hot melt adhesive film is widely used in the bonding and fixing of various materials, such as cloth, leather, plastic, metal, etc.
There are several ways to test the strength of the working bond, and one of the commonly used methods is the 90-degree peel test. The method is to paste the TPU hot melt adhesive film on the adhered object, and then place it on a specific peeling machine, peel it off at a certain speed and angle, and record the required force value. This force value is the working adhesion strength, which is one of the important indicators to evaluate the performance of TPU hot melt adhesive film.
There are many factors that affect the working adhesion strength of TPU hot melt adhesive film, the most important of which is the material and surface treatment of the adherent. Different materials have different adhesion to the adhesive film, so it is necessary to choose the appropriate adhesive film according to the material of the adherent object in practical applications. Surface treatment is also a key factor affecting the adhesion, and the surface of the adhesion must be clean, dry, and free of impurities such as oil stains to ensure the best adhesion.
In addition to the material and surface treatment of the adherent, the formula and production process of the TPU hot melt adhesive film are also factors that affect its working bond strength. Different formulations and processes will lead to different physical properties such as viscosity, melting point, and crystallinity of adhesive films, which will affect their adhesion properties. Therefore, in practical applications, it is necessary to choose the appropriate adhesive film formulation and production process according to the specific situation.
In practical applications, in order to improve the working adhesion strength of TPU hot melt adhesive film, the following methods can be adopted:
1.Surface treatment is carried out on the adhered object, such as grinding, sandblasting, chemical treatment, etc., to improve the surface energy and increase the adhesion.
2.Choose the right TPU hot melt adhesive film formulation and production process to obtain the best physical properties and adhesive properties.
3.A certain pressure and temperature are applied during the pasting process to ensure that the adhesive film is in close contact with the adhered object, increasing the adhesive area and adhesive force.
4.For the bonding parts that need to withstand gravity for a long time, they should be inspected and maintained regularly, and the damaged parts should be repaired in time to ensure the strength and safety of the bond.
In short, the working bonding strength of TPU hot-melt adhesive film is one of the important indicators to evaluate its performance, and it is necessary to select the appropriate adhesive film formulation, production process and surface treatment method according to the specific situation in practical application to ensure the best bonding effect. At the same time, for the bonding parts that need to withstand gravity for a long time, they should be inspected and maintained regularly, and the damaged parts should be repaired in time to ensure the bonding strength and safety.