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Parts Packaging

Logas aims at reducing setup and in-process times, and completely eliminating materials handling to assure the reliability of assembled PCB’s. ESD requirements are strictly observed. However, good practice needs to be adopted when parts meant for assembly are sent to Logas.

Logas recommends the use of appropriate ESD bags, containers, reels and sticks for handling parts to assure the reliability of electronics products. The products not handled properly may not fail at our customers' test rooms only to fail later in field. There are costs associated with these failures and Logas is committed to eliminating these costs by preventing the failures.

When parts are sent to Logas, the following requirements need to be observed:

a.    Extra leaders and tapes: For parts on reels, it is recommended that at least 16” of tape and 6” of leads be left unused. This is required for feeder attachment.
Damaged Parts
Fig. 6: Reels with extra tape and leads

b.   Matching ESD trays:
Use ESD trays with partitioning that matches the shape of the parts. This prevents the parts from getting damaged on slight impact. It is also recommended that parts in trays follow uniform orientation. The robots may not check for orientation hence good practice should be adopted in this regard. See figure 7.

When two trays with different partitioning are used to hold parts together, the probability of parts leads or even entire parts getting damaged is very high. This results from movements of parts inside the package which is exactly what the package is meant to prevent. The damaged leads will not pass component recognition test by the placement robots bottom vision cameras. See figure 8.
Damaged Parts

Fig 7: ESD trays with partitioning to hold parts in transit and parts placed with orientation.

Damaged Parts
Fig 8: Damaged leads created by use of non-matching ESD trays.

c. Proper alignment of parts inside tapes:
Logas suggests that parts arrive at production plant in their original packaging from parts suppliers. However, clients may decide to repackage parts for cost or availability reasons. In such situations, Logas suggests that those parts be clearly marked or the information indicated on the kit summary documentation which usually accompanies the assembly kit to Logas production facility. Inspection of repackaged parts revealed occurrence of wrong polarities and multiple part types in a single reel. This will normally require additional inspection be carried out on the reels before they are programmed for placement. In other cases it was observed that parts are reeled with tapes that are meant for a different sized component. This causes pickup and placement problems. See figure 9.

Fig 9: Repackaged parts with poor orientations and wrong tape sizes.

d. Parts labeling
Logas quality management system requires the identification of customer supplied equipment and materials for traceability. The basic information expected for each part package include the following: - Part number - Assembly No. (including revision if necessary) - Quantity - Work order/Purchase order number See figure 10.

Fig 10: Recommended Part label.
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