Keywords:
Welcome!Dongguan Green TPU Co.
Ltd. TPU film
Hot melt film
TPU apron
Electroplating tpu film
Dongguan Green TPU Co.,Ltd.
15year TPU film/TPU hot melt adhesive film custom manufacturer
Service Hotline
13686006083
Welcome to us
Adhesion and bonding strength of tpu hot melt adhesive film
​tpu hot melt adhesive film is a kind of film made of thermoplastic polyurethane material, which is widely used in bonding and fixing of various materials due to its good adhesion and bonding strength. In this paper, we will introduce the relationship between the adhesion force and bonding strength of tpu hot melt adhesive film and its influencing factors in detail.
2024-01-16
Back List

Adhesion and bonding strength of tpu hot melt adhesive film

    tpu hot melt adhesive film is a kind of film made of thermoplastic polyurethane material, which is widely used in bonding and fixing of various materials due to its good adhesion and bonding strength. In this paper, we will introduce the relationship between the adhesion force and bonding strength of tpu hot melt adhesive film and its influencing factors in detail.

    First, tpu hot melt adhesive film adhesive force and bond strength of the relationship between

    Adhesion force refers to the two objects in contact, due to the interaction between the surface molecules and produce a mutual attraction. Bonding strength is the adhesive on the two bonding surfaces to form the sum of the adhesive force. tpu hot melt adhesive film adhesion and bonding strength there is a close relationship between the adhesion.

    1. Adhesion force is the premise and foundation of bond strength. Only when there is a good adhesion between two objects, can form a strong bond strength.

    2. The magnitude of bond strength depends on the level and nature of the adhesive force. Usually, tpu hot melt adhesive film with stronger adhesive force will show higher bond strength.

    Second, the factors affecting tpu hot melt adhesive film adhesion and bonding strength

    1. temperature

    Temperature is the key factor affecting the adhesion and bonding strength of tpu hot melt adhesive film. In the appropriate temperature range, the viscosity of the adhesive film will be reduced as the temperature rises, making it easier to flow and wetting the surface of the object to be adhered to, so as to improve the adhesion and bonding strength. However, too high a temperature may cause the adhesive film to soften or dissolve excessively, causing it to lose adhesion. Therefore, in practical application, it is necessary to select the appropriate heating temperature and heating time according to the nature of the bonded material and the requirements of the processing technology.

    2. Pressure

    Appropriate pressure can promote the contact and interaction between tpu hot melt adhesive film and the surface of the bonded material, thus enhancing the adhesion and bond strength. Under the condition of heating and pressurization, the adhesive film can better wet the surface of the adherend, expel air and moisture, reduce the pores and bumps, so as to improve the bonding effect. However, excessive pressure may lead to deformation or damage of the bonded material and affect its usability. Therefore, it is necessary to choose the appropriate heating temperature and heating time according to the nature and thickness of the bonded material.

    3. Thickness and uniformity of the adhesive film

    The thickness and uniformity of tpu hot melt adhesive film also has a great influence on its adhesion and bonding strength. Thinner film can be better adapted to the surface contour of the object to be adhered to, reduce gaps and bumps, improve the bonding effect. At the same time, the uniformity of the adhesive film is also very important, if the thickness of the film is not uniform, it will lead to localized areas of voids or bumps, thus affecting the adhesion and bond strength of the entire bonding surface. Therefore, the thickness and uniformity of the adhesive film need to be controlled in the production process.

    tpu热熔胶膜-裸模.gif

View Other
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.
MORE