DSS-M.01.04 — Conveyor/Belt Line Scoring (handling line)

Long, transport-direction linear lines/bands produced when a lite slides or oscillates on a conveyor/belt/handling rail during fabrication, glazing, or site handling. Presents as directional linear scoring that is often bay-to-bay continuous, sometimes in parallel sets at consistent spacing; in raking light, edges can show bright “chip-flanks”/micro-chipping when depth increases. Terminology for micro-chipping / chip flank and use of surface-catch (MSRT) and VIS viewing conditions follow the VIS (classification is appearance-based).

• Long, straight to gently meandering linear bands that may run the width or length of the lite; often multiple parallels that align with conveyor/rail contact zones.
• Consistency across adjacent lites (same elevation/line) is common.
• Persists after Non-Invasive Reveal (clean & dry); unlike residue, does not wipe off. Inspect at VIS geometry (12 / 36 / 72 in; normal + oblique; raking).

Surface-catch class (MSRT):

• SC-1 (slight) for shallow transport marks; SC-2 (clear) when scoring with chip-flanks is present. MSRT = one light, non-marring pass to support classification (not acceptance).

Reveal / lighting / geometry:

• Complete Non-Invasive Reveal; then evaluate at 12 / 36 / 72 in with normal incidence + oblique sweep (~60°-120°) under raking light, per VIS. Record distances/angles in the photo frames.

Location / access:

• Confirm the cue is on the exposed face (not between panes). Use parallax when IGUs are present (between-pane features show fixed parallax) and record surface numbering #1-#4 / laminate-internal on Forms: If between panes/inaccessible → CAT-5 by location.

Assign CAT by visibility convention + MSRT and edge/morphology (three-part cueing in VIS):

• CAT-2 - Light: Fine, clean-edged lines with SC-1; no pronounced chip-flanks; limited impact at standard view.
• CAT-3 - Moderate: SC-2 with minor chip-flanks; noticeable at standard distance.
• CAT-4 - Severe: SC-2 (clear-to-strong) with rough chip-flanks, occasional pits/craters; distinctly visible at standard and wide-field views.

(Classification is appearance-based; acceptance governed separately by VIS §6.)

• CAT-2: ~0.2-1 μm (fine transport lineation; minimal flank breakout).
• CAT-3: ~1-5 μm (incipient micro-chipping along flanks).
• CAT-4: ≥5 μm (rough chip-flank breakout; local pits/craters possible). (Depths are illustrative for cueing only; VIS classification/acceptance remains appearance-based.)

• vs. Straightedge/metal-guide scoring (M.01.02): Guide scoring is ruler-straight with consistent depth; conveyor lines may wander slightly and often appear as multiple bands at handling-zone spacing.
• vs. Glass-on-glass tracks (M.01.03): Tracks are frequently paired arcs/lines reflecting sweep/pivot; conveyor lines are transport-direction runs and may repeat across lites.
• vs. Residue films/overspray (R-family): Residues change with Non-Invasive Reveal; scoring persists. (Apply VIS reveal + geometry.)

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique, include raking. Capture at least one context frame showing band continuity and any parallel sets; include a straight reference where practical. Record distance/angle in-frame.
• MSRT result: Record SC class (SC-1 or SC-2 as observed); one pass, non-marring.
• Forms: Pane ID; surface numbering (#1-#4 / laminate-internal); worked surface Y/N; geometry checklist; reveal status; lighting/time; attach photos-per VIS Appendix X3.

• Attempting to “feather” or “blend” a transport line during inspection can create a worked region/transition edge, which VIS disallows at acceptance for CAT-0...CAT-4. Keep evaluation non-marring and appearance-only.

• M.01.04 Conveyor/Belt Line Scoring (handling line) - Long transport-direction line(s)/band(s) at #__ confirmed after Non-Invasive Reveal; MSRT = SC-1/SC-2 with/without chip-flanks. Classified CAT-2/3/4 by visibility and flank severity per VIS. Photo set at 12/36/72 in (normal + oblique + raking), with context showing band continuity/parallel sets; surface numbering and form fields recorded. Acceptance per VIS §6 (appearance-based).