DSS-R.03.03 — Roller / Handling Rail Transfer

Roller/handling rail transfer is an appearance change on glass from contact with conveyor rollers, storage/handling rails, truck/rack rails, or in-plant guides during fabrication, transport, or staging. It presents as linear bands (often horizontal), repeating pitch marks matching roller spacing, or soiled streaks at consistent heights. Transfer may include rubber/plasticizer films, dust/oxide, or shop grime, sometimes with pressure marks from dwell or vibration. Classification is appearance-only per VIS (method-agnostic). Inspect after Non-Invasive Reveal under VIS lighting/geometry; record surface numbering and worked-surface status.

• Straight, level bands at recurrent elevations (e.g., 200-400 mm above sill) corresponding to rack rails; may appear on multiple adjacent lites at the same height.
• Repeating “tick” pattern at roller pitch (factory conveyor lines) or broad smudged rails from storage cradles.
• In specular: dirty/grey streaks; in raking: drag direction with fine particulate embed along the band.

Surface-catch class (MSRT)

• Typically SC-0 (film/pressure-only).
• SC-1 can appear where aged plasticizer/oxidized rubbers or abrasive dust produced very shallow micro-texture during movement; SC-2 uncommon-recheck classification if present.
• Perform one light, non-marring pass on a small revealed test patch (substrate), not over gummy accumulations. Use polymer stylus if a functional coating is suspected on the worked face. MSRT supports classification only.

Visual signature

• Linear, level bands (often parallel to sill) that continue across multiple panes; may include periodic darker ticks at roller spacing.
• Soil-laden streaks with drag direction (in/out of opening); no chip-flank sparkle (not mechanical scoring); no fused pits/nodules (not hot-particle).

Viewing / lighting

• Evaluate clean & dry at 12 / 36 / 72 in, normal incidence and oblique sweep (~60°-120°); raking resolves band edges, pitch marks, particulate embed. Record distances/angles in-frame.

Location / access

• Record pane ID and surface numbering (#1-#4; laminate-internal). If fixed parallax places the band on #2/#3 (IGU cavity), classify CAT-5 by location (out of in-place scope) and refer.

Mechanism cue (context)

• Evidence of factory conveyors, storage racks/cradles, A-frames, truck transport photos, site staging rails; common elevation across many lites is a strong cue.

Assign CAT by visibility at acceptance geometry and MSRT after a controlled reveal test. Depth values are indicative-field measurement not required.

• CAT-1 (Benign / non-relief): Faint linear band(s); SC-0 after reveal; mostly angle/raking visible. Indicative relief: 0-10 μm (optical film).
• CAT-2 (Light): Persistent rail bands with soil loading or slight SC-1 (aged plasticizer/oxidation); limited impact at standard view. Indicative relief: ~10-40 μm.
• CAT-3 (Moderate): Wide/contrasty bands or repeating roller pitch legible at standard distance; localized SC-1→SC-2 where abrasion with dust occurred. Indicative relief: ~40-120 μm.
• Reclassify when: If, after true residue removal, modeled micro-texture or linear scoring remains → evaluate under M.01 (linear scoring) or M.02 (abrasion fields) as applicable.
• CAT-5 (by condition/location): Between-pane/inaccessible by parallax, integrity indicators, or confirmed functional-coating loss on the surface to be worked → CAT-5.

CAT is appearance-based; acceptance is separate under VIS-A at 12/36/72 in. Do not abrade to “force” removal during classification.

• vs. Conveyor/belt line scoring (M.01.04): True scoring shows chip-flank sparkle and SC-2; rail transfer is film/soil with SC-0/SC-1 and lacks sharp line incision.
• vs. Straightedge/metal guide scoring (M.01.02): Guide scoring is single/few sharp lines; rail transfer is broad banding often repeating across multiple panes.
• vs. Paint overspray (R.02.01): Overspray is speckled/mist without strict level bands or roller pitch.
• vs. Silicone/PIB smears (R.01.xx): Sealant smears hug joints and show corduroy/stringers; rail transfer aligns with handling heights and transport geometry.
• vs. Mineral run/stain (Ch.03.02): Mineral runs follow gravity/drip paths (vertical); rail transfer is horizontal/level and repeatable across bays.

• Photo set (VIS): 12 / 36 / 72 in, normal + oblique; raking macros of band edges, pitch marks, particulate embed; context frames capturing repeating elevation across bays and any racks/rails on site. Record distance/angle in-frame.
• MSRT result (substrate): After a small reveal test patch, perform one light, non-marring pass; record SC-class (SC-0/SC-1/SC-2).
• Forms: Pane ID; product family & surface numbering; worked surface Y/N; functional coating present on worked surface? (Y/N/Unknown); reveal status; lighting/time; geometry checklist; photos attached.
• Acceptance split: Post-restoration acceptance per VIS-A §6; classification ≠ acceptance. Coated-face appearance rules apply per VIS §6.2.e when the worked surface is a factory functional coating.

• R.03.03 Roller / Handling Rail Transfer - Linear, level band(s) with repeating pitch marks/soil streaks on surface #___; post-reveal test patch shows [SC-0/SC-1]; visible at [12/36/72 in] under VIS geometry. Morphology: rail-height streaks, roller pitch ticks, drag direction; no chip-flank sparkle, no discrete pits. Classification: CAT-[1/2/3] by visibility and SC-class; reclassify to M.01/M.02 if scoring/abrasion persists after true residue lift; CAT-5 if between-pane or coating-side loss on the surface to be worked. Forms + photo set attached; acceptance per VIS-A §6.