What are the temperature control and pressure parameters of the capacitive touch screen in a constant temperature hot press machine?

The temperature control and pressure parameters of the constant temperature hot press machine in the production of capacitive touch screens depend on specific production processes (such as ACF binding, FOG/COG bonding, FPC connection, etc.), and there are significant differences in parameters in different scenarios. Based on industry standards and practical application cases, specific references are as follows:

1、 Temperature control parameters (core range)

Conventional ACF binding (consumer electronics, small and medium-sized capacitive screens): The temperature is usually controlled at 190 ± 10 ℃, with COG bonding required to reach 200 ± 10 ℃, and the pre bonding temperature is relatively low, about 70 ± 10 ℃; FOG hot pressing suitable for IPS screens, with accurate temperature control between 135 ℃ -140 ℃ to avoid MURA phenomenon.

Hot press bonding (FOG, TAB process) in the field of industrial control: temperature control is more accurate, with a temperature difference accuracy of ± 5 ℃ and a conventional range of 180-220 ℃. It relies on Japanese temperature control modules to achieve stable temperature control.

Flexible capacitive screen (COF binding, FPC connection): The temperature is relatively mild, about 170-190 ℃, to avoid high temperature damage to flexible components, while accurately controlling the heating rate to ensure bonding quality.

Large scale production of full-size capacitive screens: The temperature adjustable range is wider (from room temperature to 300 ℃), and the temperature control accuracy can reach ± 1 ℃. It can be flexibly adapted according to different structures such as G+G and G+FF.

2、 Pressure parameters (core range)

Small and medium-sized ACF binding and FPC bonding: The pressure is usually 2-3MPa, and the head pressure can be refined to 5-95Kgf. The working pressure is controlled at 0.5-0.7MPa to avoid virtual soldering or component damage; The pressure during the preloading stage is relatively low, about 0.1MPa, while during the main pressing stage it is about 0.2-0.25MPa.

Pre pressing process in the field of industrial control: flexible pressure regulation, pressure control accuracy can reach ± 0.5MPa, and according to the impact resistance requirements of industrial control screens, the pressure range can be flexibly adjusted to enhance component adhesion.

Flexible capacitive screen hot pressing: The pressure should be accurate and gentle, about 1-2MPa, matched with SMC pressure regulating valve to avoid wrinkles and damage to flexible components, and achieve accurate connection of micro pitch PIN pins.

Full size capacitor screen production: adjustable pressure range of 0-50MPa, pressure can reach 10-40T, suitable for the hot pressing requirements of different sizes and structures of capacitor screens, ensuring tight adhesion.