DSS-P.01.04 — Roller Pickup / “Line Ghost” (pyrolytic line pattern)

A linear appearance feature associated with pyrolytic (hard-coat) deposition on the float line, observed as faint, conveyor-parallel lines or “ghosts” that repeat across a lite. It is a factory/processing signature of the coating run, not a localized surface-relief defect. For coating product context see the VIS normative references list (ASTM C1376).

• Fine, straight, parallel lines visible in reflection/transmission-often aligned with float/conveyor direction.
• Tonal/sheen change without a perceivable edge; visibility varies with oblique sweep and raking light per VIS geometry.
• Does not respond to non-invasive reveal (cleaning); pattern is uniform over broad areas rather than localized like scoring.

Surface-catch class (MSRT):

• SC-0 (none). Perform one light, non-marring pass only; do not abrade or repeat passes.

Morphology:

• Pane-scale linear appearance without chip flanks/pits; no transition edge typical of worked regions.

Viewing:

• Use VIS distances 12/36/72 in; evaluate at normal and oblique sweep (~60°-120°) under raking/low-angle light.

• Not field damage When observation confirms SC-0 with conveyor-parallel, pane-scale lines and no local relief/morphology, record: “Processing Feature - Not Surface Damage (outside CAT-1...CAT-4).”
• If the pattern is confirmed inside an IGU cavity (fixed parallax), record CAT-5 (out of in-place scope by location) and refer per project protocol.

Not applicable as a local surface-relief quantity. Roller pickup/line ghosts are appearance signatures of coating manufacture; no micrometre-scale relief is detected by MSRT (SC-0).

• vs. Scraper/razor scoring (M.01.01): Scoring shows clear surface catch and often bright chip flanks under raking light; roller pickup is non-tactile and lacks fracture flanks.
• vs. Coating rub/patchiness (Co.01.02): Rub marks present localized sheen shift and may read with a perimeter or directionality; roller pickup is uniform/parallel to conveyance with no worked boundary. Acceptance prohibits coating anomalies on the worked surface.
• vs. Micro-abrasion swirls (M.02.01): Swirls appear curvilinear/cross-hatched and can show slight catch; roller pickup remains straight, parallel, SC-0.

• Photo set per VIS: capture at 12 / 36 / 72 in, normal + oblique; include a straight reference (mullion/string line) when practical to emphasize parallelism; note if raking used.
• MSRT result: Record SC-0 (none); one pass only; non-marring.
• Forms: Pane ID, surface numbering (#1-#4; laminate-internal), coating present on worked surface? (Y/N/Unknown), reveal status, lighting notes/time.
• Acceptance split: Remember VIS governs post-restoration acceptance; factory features are addressed by product standards/project specs; do not conflate.

Where a functional coating is on the worked surface, no coating anomaly may be introduced (VIS §6.2.e). Note presence; do not alter coatings during evaluation.

• P.01.04 Roller Pickup / Line Ghost (Processing Feature) - Conveyor-parallel, pane-scale linear appearance observed at VIS geometry; MSRT = SC-0 (no surface relief). No transition edge or chip-flank morphology. Recorded as manufacturing/coating feature; not categorized as surface damage under VIS-DA. If fixed parallax indicates cavity location, classify CAT-5 and refer per project protocol.