A. Heating mode: There are two heating modes: constant temperature heating and pulse heating. Constant temperature heating mode is simple in structure and easy to control. It is used in the occasion of low temperature control and no special temperature control curve is required. The structure of pulse heating mode is complex, and the temperature control curve of temperature and time can be realized according to the user's requirements.
B. Power factor: Pulse heating generally belongs to inductive load. It uses transformer to output large current and heat its surface through resistive load (hot pressing head). The larger the current needed, the lower the effective power, the greater the interference to the power grid and the unstable factors. The theoretical value of ACF hot pressing can not exceed 1000W.
C. Temperature characteristics: The temperature rise curve must be adjustable, and the peak temperature drift should not be greater than 0.5 degrees. There are two main factors affecting the curing of ACF adhesive: the initial temperature rise rate and the peak temperature. The heating rate determines the surface quality after curing, while the peak temperature determines the bonding strength and hot pressing quality after curing. Most of the pulsed hot pressing heads are made of titanium alloy, which is heated by high current through titanium alloy. Because of the complex purity and processing of metals, it is difficult to guarantee the cross-sectional area and internal resistance of the heating surface. All in all, the same hot-pressing surface will produce many different temperatures when the temperature drifts repeatedly, and the phenomenon of empty welding will occur. Surface welding is uneven, which seriously affects the quality of products. Therefore, it is necessary to ensure that the peak temperature is as constant as possible at the predetermined temperature, and make use of the thermal conductivity of the metal itself to make the temperature of the heating surface close to constant. Fixed.
D. Bias ratio of hot pressing: The accuracy of biasing between FPC and ITO electrodes is usually smaller with fewer screen drives and smaller electrode width and spacing at a certain resolution. The resolution of liquid crystal screen is higher and higher with the width of electrode reaching 10um or smaller, requiring that the maximum precision of repeated pressing should not be greater +/-5um. The above factors include balance smoothness and temperature stability of the hot-press head, as well as the stability of the output components, including cylinder, guide rail and machine structure.
E. Output stability: ACF conductive particles burst and solidify at a certain temperature, pressure and time. Cylinder output is particularly important at a given temperature and time. Air welding and many other unstable factors are bound to occur when the quality of cylinder is unstable. The repairing rate also increased.
F. alignment system: The pins of FPC and LCD are aligned accurately by digital microscope-assisted image system. Because of the variety of screen types and the different width of ITO electrodes, the microscope is required to meet different electrode widths, adjustable magnification, clear alignment image, adjustable lens position, stable structure, no jitter, and position. Precision does not deviate.
The production and acceptance of equipment have a set of strict plans, but in fact, when considering all the above factors, the cost of equipment will also rise. Users should choose according to the actual needs of use. For example, when it is used in batch processing, the first thing to consider is quality and efficiency, which requires high repetition accuracy and performance of equipment; when the number of household electrical appliances is not very large, we can consider relatively low-end equipment, so as to reduce the purchase cost of equipment; advantages and disadvantages; According to the actual situation, avoid secondary investment, resulting in waste of resources!!
B. Power factor: Pulse heating generally belongs to inductive load. It uses transformer to output large current and heat its surface through resistive load (hot pressing head). The larger the current needed, the lower the effective power, the greater the interference to the power grid and the unstable factors. The theoretical value of ACF hot pressing can not exceed 1000W.
C. Temperature characteristics: The temperature rise curve must be adjustable, and the peak temperature drift should not be greater than 0.5 degrees. There are two main factors affecting the curing of ACF adhesive: the initial temperature rise rate and the peak temperature. The heating rate determines the surface quality after curing, while the peak temperature determines the bonding strength and hot pressing quality after curing. Most of the pulsed hot pressing heads are made of titanium alloy, which is heated by high current through titanium alloy. Because of the complex purity and processing of metals, it is difficult to guarantee the cross-sectional area and internal resistance of the heating surface. All in all, the same hot-pressing surface will produce many different temperatures when the temperature drifts repeatedly, and the phenomenon of empty welding will occur. Surface welding is uneven, which seriously affects the quality of products. Therefore, it is necessary to ensure that the peak temperature is as constant as possible at the predetermined temperature, and make use of the thermal conductivity of the metal itself to make the temperature of the heating surface close to constant. Fixed.
D. Bias ratio of hot pressing: The accuracy of biasing between FPC and ITO electrodes is usually smaller with fewer screen drives and smaller electrode width and spacing at a certain resolution. The resolution of liquid crystal screen is higher and higher with the width of electrode reaching 10um or smaller, requiring that the maximum precision of repeated pressing should not be greater +/-5um. The above factors include balance smoothness and temperature stability of the hot-press head, as well as the stability of the output components, including cylinder, guide rail and machine structure.
E. Output stability: ACF conductive particles burst and solidify at a certain temperature, pressure and time. Cylinder output is particularly important at a given temperature and time. Air welding and many other unstable factors are bound to occur when the quality of cylinder is unstable. The repairing rate also increased.
F. alignment system: The pins of FPC and LCD are aligned accurately by digital microscope-assisted image system. Because of the variety of screen types and the different width of ITO electrodes, the microscope is required to meet different electrode widths, adjustable magnification, clear alignment image, adjustable lens position, stable structure, no jitter, and position. Precision does not deviate.
The production and acceptance of equipment have a set of strict plans, but in fact, when considering all the above factors, the cost of equipment will also rise. Users should choose according to the actual needs of use. For example, when it is used in batch processing, the first thing to consider is quality and efficiency, which requires high repetition accuracy and performance of equipment; when the number of household electrical appliances is not very large, we can consider relatively low-end equipment, so as to reduce the purchase cost of equipment; advantages and disadvantages; According to the actual situation, avoid secondary investment, resulting in waste of resources!!
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