一个MSA案例 - 纸载带包装槽尺寸的测量方法改善

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9 Y# }3 U: B; N4 J5 sA GRR MSA Study - Improving the Measurement Method of pocket dimension of chip carrier tape

Abstract
The chip pocket size of the paper carrier tape is one of the most import quality characteristics. The size of the chip pocket may greatly affect the pick & place performance in the SMT process. If the pocket size is too big, the residing chip may flip to the corner, meanwhile if the pocket size is too small, the residing chip may get stuck. Both scenarios are proven to be problematic for the pick & place vacuum suction nozzle. The quality check of the chip pocket size becomes a crucial inspection item to ensure that the width and length of the pockets are conforming to the specified specifications. However, not all inspection methods are
- i3 n* z/ w9 F! F- `' A8 zequal as we shall see from this technical report.
& c7 ^8 e0 e. n3 S/ N2 Q- @A new approach to measure the pocket size of the paper carrier tape is examined. The new approach involves the light source coming from the top with bottom-up placement of the tape sample. The old method involves the light source originates from the bottom with bottom-down placement of the tape sample. After analyzing the physical characteristics of the tape samples and the measurement principle of the precision light projection measurement apparatus, we can see that in theory the new method enables the inspector to make more precise observations. The Gage R&R analysis of the new method versus the old method also confirms that the new method yield less variations from the inspectors and more variations from part-to-part, meaning that the new measurement system is able to detect differences among the measurement samples much better than the old method.

Keywords:
( O+ z9 F' b, c6 N8 M2 P/ d, JPaper Carrier Tape; Chip Pocket Size; Gage R&R