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Causes and Solutions of SMT Component Billboarding & Flipping
Component billboarding and flipping are common placement defects in SMT production, mostly appearing on small chip parts. They slow down inspection progress and bring troubles to later maintenance, even leading to product failure.

1. Component Billboarding

Phenomenon: Components fall sideways and contact pads only by their sides.
Main Causes

  1. Loose component carrier tape causes messy material arrangement.

  2. Improper nozzle type and unstable suction force.

  3. Wrong placement height and downward pressure parameters.

  4. Vibration and friction on conveyor track during transmission.

  5. Offset solder paste leads to unbalanced stress.

Solutions

  1. Check incoming material packaging strictly and reject loose goods.

  2. Use matched nozzles and clean them regularly.

  3. Adjust placement height and pressure accurately.

  4. Keep conveyor track smooth to reduce vibration and friction.

  5. Correct printing position to ensure centered solder paste.

2. Component Flipping

Phenomenon: Components are mounted upside down with marking side facing down.
Main Causes

  1. Mixed materials and disordered arrangement in carrier tape.

  2. Abnormal vision recognition and wrong polarity judgment.

  3. Component jumping and flipping during high-speed placement.

  4. Strong hot air flow impact inside reflow oven.

Solutions

  1. Check component direction carefully before feeding.

  2. Calibrate machine vision system and optimize identification program.

  3. Adjust placement speed properly to avoid component flipping.

  4. Optimize air flow inside reflow oven to reduce disturbance.

These defects are mainly related to material management, placement parameters and visual recognition. Regular equipment inspection and fixed parameter setting can greatly reduce defect rate.
Globalwell standardizes material checking procedures and calibrates placement equipment regularly. We fully control the whole production process to avoid placement errors and improve first-pass production yield.


 

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