How to determine the clean coverage boundary of FFU at advanced packaging stations
Coverage boundary is not equal to table area
Advanced packaging workstations usually have a defined work surface or equipment area. When configuring FFU in some projects, the air supply coverage will be determined directly based on the countertop area, assuming that the coverage area is the same as the countertop.
However, in advanced packaging processes, product exposure locations, key operating actions, and material movement paths may not completely coincide with the table area. For example, the product may be loaded on one side of the table, the operator reaches out from the side, and the material enters and exits from above or behind. These actions may extend beyond coverage simply calculated by countertop area.
If the FFU coverage boundary is determined only based on the mesa area, actual process risk points may be missed. Therefore, the FFU coverage boundary of advanced packaging stations should be determined around product exposure, critical actions, and material paths. Aili Industrial has complete production capabilities in semiconductor FFU matching and can provide air supply solutions based on packaging process conditions. For the basic structure of the FFU machine, please refer toAili Industrial FFU fan filter unit。
How to dismantle craft actions
Before determining the coverage boundary, you can first disassemble the process actions of the station. Where does the product enter the work station, where is it exposed, what operating steps does it go through, and where does it leave. Where does the operator stand and what is the range of movement of the arm. From which direction materials and tools enter and whether they need to be temporarily placed.
After disassembling the actions, the spatial location corresponding to each action can be marked. The location of product exposure is the focus of coverage. Operator arm range of motion may need to be covered. Material and tool entry and exit paths may require air flow protection. Together, these locations and paths form the actual coverage requirements.
Process action dismantling can be completed through on-site observation, video recording or communication with operators. The actions of different products and different processes may be different, and the coverage boundaries may also be different.
How to identify product exposure and contamination sensitive points
In advanced packaging processes, products may be exposed at multiple points. For example, chip mounting, wire bonding, underfill, packaging molding and other processes. Each link has different exposure times and contamination sensitivities.
Contamination sensitive points may be product surfaces, solder joints, leads, substrates or packaging materials. Particulate contamination at these locations may affect electrical performance or reliability. After identifying pollution-sensitive points, it is possible to determine which locations require priority protection.
Coverage boundaries should prioritize ensuring airflow coverage of pollution-sensitive points. If the coverage is limited, you can cover key sensitive points first and then consider auxiliary areas.
How obstructions affect coverage
There may be equipment, jigs, tools, displays, lighting or pipelines at the workstation. These obstacles will prevent the FFU air supply from reaching the product surface. If an obstruction is located between the FFU and the product, airflow may be blocked or redirected.
When confirming the coverage boundary, the location and height of obstacles should be marked to evaluate their impact on airflow. If there are many obstacles, it may be necessary to adjust the FFU position, increase local air supply, or change the air supply direction.
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How to do dynamic verification
After the coverage boundary is determined, it should be verified under actual production conditions. The verification includes: wind speed and airflow direction at the exposed position of the product; changes in airflow when the operator moves; changes in particles when materials enter and exit; and cleanliness of key sensitive points.
Anemometers, particle counters and smoke generating devices may be used for verification. If insufficient coverage is found, the FFU position, air supply direction, or local protection can be adjusted.
Dynamic verification can better reflect the actual protection effect than static measurement. Advanced packaging stations usually have personnel operations and material flow, and the air flow in the dynamic state is different from that in the empty state.
How to record coverage boundaries
After the coverage boundary is determined, it is recommended to record it in drawings or documents. The content includes: workstation layout and product exposure location; FFU layout and air supply range; key sensitive points and protection requirements; location of obstacles; location of measurement points and verification results.
Records can assist in subsequent maintenance, modification and replication to other workstations. Coverage boundaries also need to be re-evaluated if the process or equipment changes.
Issues that should be confirmed in advance during project communication
In the advanced packaging station FFU coverage design stage, it is recommended to confirm the following with the FFU manufacturer and process party: process flow and product exposure location; operator actions and material paths; pollution sensitive points and protection requirements; location of station equipment and obstacles; target wind speed and coverage; verification methods and judgment standards; whether local air supply or enclosure is required; maintenance and adjustment methods.
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in conclusion
The FFU coverage boundary of advanced packaging stations should be determined around product exposure, key process actions and material movement paths. The air supply area is the same as the countertop area, which does not mean that all process risk points are protected. Obstacles, dynamic operations and pollution-sensitive points will all affect the actual coverage. After the coverage boundary is determined, it should be confirmed through dynamic verification.
Aili Industrial has complete production capabilities in semiconductor FFU matching and can provide air supply solutions based on packaging process conditions. If you need to know more about advanced packaging FFU configuration, you can visitAili Industrial FFU fan filter unit , you are also welcome to contact Aili Industrial for project support.
