Carrier tape jamming is a common and serious defect in the automated SMT process, directly causing production line stoppages and efficiency loss. The causes of jamming are complex, mainly categorized into two types: issues with the component itself, and issues with carrier tape manufacturing or usage.

1. Analysis of Jamming Causes

1.1 Component Issues

• Oversized Dimensions: Component dimensions are outside the design tolerance range, causing interference with the carrier tape pocket, preventing smooth insertion or extraction.
• Deformation or Burrs: Components have deformations or burrs invisible to the naked eye. Interference between these irregularities and the pocket walls is a primary cause of jamming.

1.2 Carrier Tape Issues

• Mold Wear: Long-term use without maintenance leads to reduced mold dimensions. For example, mold corners wear into R-angles, causing rounded corners at the pocket bottom, which interfere with component pins.
• Abnormal Feeding/Winding: If the inner ring tape sticks to the shaft preventing smooth feeding, or if there is backward tension during winding, uneven tape pulling occurs. This causes heating position misalignment, resulting in undersized pockets or undercuts (backdrafts).
• Improper Parameter Settings: Improper heat forming settings can lead to overly thin pocket walls, causing deformation during winding or transport.
• External Compression: Tape pockets deform due to external pressure during transportation (courier).
• Design Flaws: Insufficient consideration of tolerances during engineering design, where the gap between the pocket's lower limit and component's upper limit is too small, creating a jamming risk.

2. Improvement Countermeasures

2.1 Component Countermeasures

• Dimension Control: Ensure all component dimensions are strictly controlled within design tolerances.
• Pre-packaging Inspection: Require full or sampling inspection before packaging to avoid introducing deformed or burred components into the automated taping process.

2.2 Carrier Tape Countermeasures

• Mold Life & Maintenance: Engineering must strictly follow "Mold Management Procedures" for lifespan control and regular maintenance to prevent corner wear.
• Stable Feeding/Winding: Ensure smooth operation of feeding and winding reels to eliminate heating mold misalignment caused by tape tension issues.
• Standardized Process Parameters: Technicians must set parameters strictly according to the Mold SOP (Standard Operating Procedure) to avoid thin pocket walls and enhance mechanical stability.
• Transport Protection: Improve packaging protection to minimize compression during courier transport and prevent pocket deformation.
• Design Optimization: Engineering must fully understand client upper/lower limits when designing pockets, leaving sufficient safety gaps to prevent jamming at the source.