How much do you know about PI film hot melt adhesive film?

PI Film and Hot Melt Adhesive Films: Key Insights

In the past decade, PI film has emerged as a high-performance polymer film material, quickly establishing its position in the field of organic thin films due to its exceptional properties. This has led to its widespread use across various industries. But how much do you know about the hot melt adhesive films used with PI film? Let's dive into this topic for a closer look.

Understanding PI Film
PI film, also known as polyimide film, is composed primarily of polyimide, making it one of the most heat-resistant and stable films available. It is widely used in electronic applications and typically comes in two colors: amber and black. When bonding PI film, the most commonly used hot melt adhesive films are PA (polyamide) and PES (copolyester) films.

PA Hot Melt Adhesive Films

The main component of PA hot melt adhesive films is copolyamide, which shares some similarities in composition with PI film. This ensures excellent adhesion between the two materials. PA adhesive films also feature a high melting point, typically between 115°C and 130°C, classifying them as high-temperature adhesive films. The recommended working temperature for PA films is 140°C to 160°C, where they maintain good adhesion and stability under high heat-perfectly aligning with the needs of PI film applications.

PA adhesive films are transparent, non-elastic, and available in models like XJA110.

PES Hot Melt Adhesive Films

PES hot melt adhesive films are made from copolyester and also exhibit good adhesion to PI film. Their standout feature is their excellent water-wash resistance, meaning they maintain adhesion even when exposed to water. PES adhesive films are relatively more cost-effective, although their bonding strength is slightly lower than that of PA films.

PES films have a melting point between 105°C and 115°C, making them medium-temperature adhesive films. They are best used at working temperatures between 130°C and 160°C, with a maximum heat tolerance of 80°C. PES films are typically semi-transparent, white with a matte finish, non-elastic, and commonly found in models such as TJS125 and XJS130.

How to Apply Hot Melt Adhesive Films to PI Film

For those unfamiliar with the process of applying hot melt adhesive films to PI film, here's a step-by-step explanation:

Using Backed Hot Melt Adhesive Films
To apply a backed hot melt adhesive film, tools like an industrial iron or a laminating machine are required. For example, with an industrial iron:

Align the adhesive film with its release paper side facing outward to the inner surface of the PI film.

Apply heat to the release paper side using the iron, allowing heat to transfer to the adhesive layer in the middle, causing it to melt and bond with the PI film.

The release paper prevents the adhesive film from sticking to the iron. Once cooled, remove the release paper to complete the adhesive backing process.

Using Non-Backed Hot Melt Adhesive Films
For non-backed adhesive films (e.g., TJS125), a flatbed or roller laminating machine is needed for application.

How to Use PI Film with Adhesive Backing

When using PI film with adhesive backing, similar pressing tools (such as an iron or heat press) are employed. Heat is applied to one side of the PI film, bonding the adhesive-backed film to another material to complete the final assembly.

Thanks to its outstanding properties, PI film has become a widely-used material for die-cutting applications in industries relying on circular blade die-cutting machines.