The grid texture design of grid release film is one of the core elements of its functionality. Its raised grid structure directly acts on the contact interface between the tape and the release film, thus influencing the release effect in multiple dimensions. This design not only changes the physical properties of traditional plain release films but also demonstrates significant advantages in process applications.
From the perspective of contact area, the raised structure of the grid texture changes the contact between the tape and the release film from surface contact to point or line contact. This change in contact mode directly reduces the actual contact area between the adhesive and the release film surface, thereby reducing the adhesion force during peeling. For example, in the die-cutting of electronic tapes, the release force stability of grid release film is significantly better than that of plain release film, with its peel force fluctuation range controllable within ±5%, while the fluctuation range of plain release film typically exceeds ±15%. This stability stems from the uniform barrier effect of the grid structure on the adhesive molecular chains, avoiding peeling difficulties caused by excessive local adhesion.
In terms of venting performance, the channel effect of the grid texture plays a crucial role. When the tape adheres to the product surface, air can be quickly expelled through the grid gaps, creating a bubble-free bonding interface. This characteristic is particularly important in LCD light guide plate production—traditional plain-textured release films are prone to light spots on the light guide plate surface due to poor air venting, while grid release film can improve venting efficiency by more than 30%, significantly improving product yield. Furthermore, the regular arrangement of the grid can guide the directional flow of air, further optimizing the venting path.
The geometric parameters of the grid texture exhibit varying effects on the release effect. Grid density (the number of grids per unit area) is negatively correlated with release force: higher density results in lower release force, but excessively high density may cause burrs during die-cutting. Grid height (protrusion height) adjusts the release force by affecting the contact area; typically, a height within the range of 5-20μm balances release effect and die-cutting accuracy. The choice of grid shape (e.g., square, rhombus, hexagon) needs to be considered in conjunction with the specific application scenario—square grids are suitable for scenarios requiring high directional stability, while rhombus grids are more conducive to multi-angle venting.
In the die-cutting field, the stiffness advantage of grid release film is particularly prominent. Its regular geometric structure allows the release film to maintain high resistance to deformation during die-cutting, reducing dimensional deviations caused by material deformation. Simultaneously, the clear boundaries of the grid provide a defined cutting path for the die-cutting blade, making waste removal easier. Taking graphite sheet die-cutting as an example, using grid release film can improve waste removal efficiency by 40%, and the cut edges are smooth and burr-free, significantly reducing rework rates in subsequent processes.
The texture design of grid release film also has a positive impact on the durability of release force. Traditional plain release films are prone to release force decay during long-term storage or under high-temperature environments, while the grid structure reduces the contact area between the adhesive and the release film, lowering the possibility of chemical migration. Experiments show that after 6 months of storage at 60℃ and 85%RH, the release force retention rate of grid release film can still reach over 90%, while the retention rate of plain release film is usually below 70%.
From the perspective of application adaptability, the texture design of grid release film demonstrates high flexibility. In the field of electronic adhesive tapes, low-density, low-height meshes meet the release requirements of ultra-thin tapes; in shoe material bonding, high-density, high-stiffness meshes can withstand the mechanical stress during processing; and in the field of optical film protection, transparent grid release films achieve a balance between release effect and light transmittance by optimizing the mesh shape.
The grid texture design of grid release films significantly improves the overall performance of release effects through multiple dimensions, including contact area control, optimized venting channels, geometric parameter matching, improved die-cutting performance, enhanced release force durability, and application scenario adaptation. This design not only solves the pain points of traditional release films in terms of venting, die-cutting, and stability, but also provides a superior solution for high-end manufacturing through structural innovation. With the advancement of materials science and processing technology, grid texture design will develop towards more refined and functional directions, further expanding the application boundaries of grid release films.
