To strengthen the control of loose materials in the workshop and prevent operational defects caused by loose materials during assembly and pasting, this process is applicable to the SMT workshop production line.

Let's first understand what loose materials are: Loose materials refer to components that detach from their original packaging during the production process due to machine throwing or material assembly and disassembly.

SMT workshop bulk material processing flow:

1. During the production process, scattered materials may be generated due to equipment and other factors. Therefore, operators should check the material step distance before and during the shift, check the throwing box and garbage bin every time they dump the garbage, collect the scattered materials, and report excessive abnormal situations of scattered materials to the line leader.

2. Classify the loose materials according to the shape of the components, check the back pattern of the components to determine the material code, and then package the checked loose materials in anti-static loose boxes or bags, and mark the material code with the signature of the confirmation person.

3. One hour before the end of work or when there are still 100 PCS left on the task order, the loose materials generated during the shift should be loaded and processed. When the loose materials are put online, the operator first checks the material codes and back lines one by one to confirm that the materials are used correctly, and then fills out the "SMT Bulk Material Process Information Transmission Form". After the inspection is approved, the line leader notifies the furnace front and inspection, furnace front QC, furnace back QC, and line leader.

4. When manual mounting is used, the operator should make sure to omit the material on the mounting machine and mark it with "omission red XX" to make the furnace front clear. When the furnace front QC starts mounting a piece of loose material, the prototype should be checked, with a focus on checking the back pattern and polarity (loose material must be checked one by one)

5. When using machine mounting, the operator should first check whether the back pattern of the components is consistent with normal materials, and then load them into FEEDER material strips. Each loading should not exceed 5, check the polarity of the materials, and make proper markings. The operator should conduct a post installation inspection with the QC in front of the furnace to ensure correct installation. At the same time, the QC in front of the furnace should label the PCBA with loose material labels.

6. After the furnace, QC should focus on checking whether the back pattern and polarity of the loose material are correct for PCBA labeled or written with loose material marks. At the same time, the barcode of the PCBA should be scanned in the MC system to enter a continuous and terminated board number, and "loose material XX" should be filled in the remarks.