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OPT-Line ISO 7 — Cleanroom Robotic Coating Line
For Automotive Optical Parts · Hard Coat + Anti-Fog + LED UV Curing · ISO 7 Cleanroom Enclosure
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CLEANLINESS
ISO 7
(ISO 14644-1)
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CAPACITY
60 → 300 pcs / hour
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ENCLOSURE
15 × 12 × 5 m
(configurable)
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COMPLIANCE
CE · ATEX
on request
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01 Product Overview
The OPT-Line ISO 7 is a robotic coating line built specifically for automotive optical parts — headlamp lenses, rear-lamp lenses, reflectors and lamp covers in PC or PMMA. It combines a six-axis painting robot, an overhead conveyor, a positive-pressure cleanroom enclosure with multi-stage filtration, an LED UV curing tunnel and an electric curing oven into one PLC-controlled production line.
Optical surfaces punish mistakes. A single 0.5-micron particle landing on wet coating becomes a visible defect after curing — and on a headlamp lens, that is a rejected part. The OPT-Line is engineered around that reality: clean air in, stable laminar airflow across the part, repeatable robot paths, and controlled curing, so every piece leaving the line meets the same finish standard.
Figure 1 — Cleanroom coating unit, cutaway: HEPA-filtered laminar supply air from the ceiling plenum, overhead conveyor with hanging racks, robotic spraying inside, return air at floor level.
02 What "ISO 7" Actually Means
ISO 7 is a cleanliness class defined by the international standard ISO 14644-1. In plain terms: no more than 352,000 particles of 0.5 micron or larger per cubic metre of air. In the older naming convention it is called a “Class 10,000” cleanroom. The smaller the ISO number, the cleaner the room.
Each step down in ISO number means ten times fewer particles allowed:
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ISO Class
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≥0.5 µm particles / m³
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Older name
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Typical application
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ISO 5
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3,520
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Class 100
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Semiconductors, aseptic filling
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ISO 6
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35,200
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Class 1,000
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Precision optics, medical devices
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ISO 7
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352,000
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Class 10,000
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Pharmaceutical, medical, precision coating ← this line
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ISO 8
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3,520,000
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Class 100,000
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General industrial clean areas
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ISO 9
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35,200,000
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—
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Ordinary air-conditioned room
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Why 0.5 micron matters
A human hair is about 50 microns thick — one hundred times larger than the particle size ISO 7 controls. These particles are invisible to the eye, yet on a wet optical coating each one becomes a visible bright spot after curing. That is why optical coating lines work to ISO 7 rather than to a general industrial standard.
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03 The Four Conditions That Make a Room ISO 7
Fitting a filter does not make a room ISO 7. All four conditions must be met together:
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1 · HEPA terminal filtration
Pre-filter G4 protects the downstream stages, bag filters F7/F9 remove fine particulate, and HEPA H13/H14 terminal filters in the ceiling plenum remove 99.95% or more of the remaining particles before the air reaches the part.
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2 · High air-change rate
ISO 7 typically requires 30 to 60 air changes per hour. The constant dilution is what keeps particle count down while the line is running — a 900 m³ coating unit at 40 ACH needs roughly 36,000 m³/h of supply air.
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3 · Positive pressure
The clean zone is held at a higher pressure than the surrounding area, so when a door opens, air flows outward. Dirty air can never drift in. Pressure is monitored and alarmed by the PLC.
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4 · People and material control
Operators are the largest particle source — a walking person sheds tens of thousands of skin flakes per minute. Airlocks (SAS), tacky mats, cleanroom garments and changing rooms (Vestiaires) are not optional extras; they are part of the classification.
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04 Process Stations
Stations are configured to the customer's coating system and part geometry. The reference configuration for PC lamp lenses is shown below.
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#
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Station
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Function
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1
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Loading & fixturing
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Lenses loaded onto racks at floor level; 16 pcs per rack as standard.
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2
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Pre-treatment / de-dusting
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Ionised air blow-off removes particles before coating.
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3
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Robotic hard coating
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Six-axis robot applies the UV-curable hard coat inside the filtered booth.
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4
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Flash-off
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Controlled dwell under clean, filtered airflow before curing.
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5
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LED UV curing
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LED UV tunnel cures the hard coat in seconds, at low substrate temperature.
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6
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Anti-fog coating
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Robotic or manual application of the 1K anti-fog coating.
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7
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Electric curing oven
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Electric oven with zone temperature control for thermal cure or preheating.
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8
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Cooling
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Filtered cooling section brings parts to handling temperature.
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9
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Unloading & inspection
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Parts exit the enclosure for unload and in-line quality check.
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Robotic spraying — six-axis robot applying coating to hanging lens racks.
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Inline curing — LED UV tunnel followed by electric curing oven.
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Overhead conveyor rack — 16 lenses per rack under laminar clean air.
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05 Reference Technical Specification
Every parameter below is engineered to order.
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Parameter
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Specification
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Workpiece
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Automotive headlamp / rear-lamp lenses, reflectors, lamp covers
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Substrate
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PC, PMMA — jigging designed to part geometry
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Rack loading
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16 pcs per rack (modifiable)
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Capacity
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60 pcs/hour baseline, scalable to 300 pcs/hour
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Cleanroom class
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ISO 7 (ISO 14644-1) in the coating zone
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Cleanroom enclosure
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15,000 × 12,000 × 5,000 mm (L × W × H) — configurable
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Filtration
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G4 pre-filter + F7/F9 bag filter + HEPA H13/H14 terminal filtration
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Air changes
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30–60 ACH, engineered to the agreed class and room volume
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Airflow pattern
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Vertical laminar down-draft, positive pressure, floor-level return air
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Painting robot
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1–2 × six-axis robot, 120–200 kg payload class, spray package and paint supply
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Conveyor
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Overhead conveyor or floor-rail conveyor, VFD driven
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UV curing
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LED UV tunnel, sized to coating TDS and line speed
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Thermal curing
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Electric oven with zone control, ambient to 220 °C
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Energy saving
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Smart VFD control system; EcoSmart cross-flow plate heat recovery
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Control
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PLC + HMI, recipe management, pressure monitoring, alarm log
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Power supply
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380 V / 50 Hz / 3-phase (other local standards available)
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Compliance
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CE; ATEX-compliant configuration available on request (Zone 1 / Zone 2)
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06 Why CoatTech for an ISO 7 Coating Line
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Air handling is our core product
The air-handling unit that serves a spray booth — filtration, laminar supply, temperature and humidity control, exhaust and heat recovery — is standard equipment we manufacture, not a subcontracted extra. For a 900 m³ coating unit this is a well-proven scale for us.
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Honest about scope
Our strength is the coating line and the air system that serves it. A plant-wide central HVAC system is a different discipline, and we will say so rather than overpromise. Where we are not the right supplier, we say it clearly.
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Proven heavy-industry projects
Fully enclosed spray booths for 50-ton, 9.8 m transformer tanks in Jubail, Saudi Arabia; a 15 × 7 × 6 m retractable booth for a European steel-structure manufacturer; a four-unit custom programme in Russia.
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Energy efficiency built in
Smart VFD energy-saving control and EcoSmart cross-flow plate heat recovery cut the fresh-air load — which is the single largest operating cost on a 100% fresh-air coating line.
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07 Frequently Asked Questions
Q Is ISO 7 really necessary for lamp lenses?
A For optical parts, yes — it is the industry norm. A particle invisible to the eye becomes a visible defect once the coating cures, and on a lens that means a rejected part.
Q Can you supply the whole cleanroom, or only the coating unit?
A We supply the coating line and the cleanroom enclosure and air-handling system that serves it. A plant-wide central cleanroom HVAC system — central AHU battery, chiller plant and building-wide BMS — is normally handled by a specialized cleanroom HVAC contractor.
Q How much air does the 15 × 12 × 5 m unit need?
A The unit is about 900 m³. At 40 air changes per hour that is roughly 36,000 m³/h of supply air.
Q Can the line grow from 60 to 300 pcs/hour?
A Yes, but the layout must be decided up front — rack pitch, conveyor speed and curing lengths all scale with capacity, and they are expensive to change afterwards.
Q Is the line ATEX certified?
A Standard machines are CE. An ATEX-compliant configuration — Ex motors, Ex lighting, gas detection, purging and full documentation — is engineered on request for Zone 1 / Zone 2 areas.
Q Do you supply the coating material?
A No. Coating TDS is provided by you or your paint supplier, and we size the UV tunnel and oven to it.
08 Request a Proposal
Send us your part drawing or sketch, target capacity, coating system and available floor space. Our engineering team will return a process layout, a specification sheet and a budget quotation — normally within a few working days.
Product Tags:
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OPT-Line ISO 7 — Cleanroom Robotic Coating Line Images
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