UV curing system

dryingwith belt conveyor

Overview
BELTROTHERM thermal curing conveyor for production processes such as PCBs, membrane switches, scales and panels produced by phototechnique or screen printing. Designed for predrying and final curing of photosensitive inks and soldermasks (single- or double-sided) on flat or V-belt transport systems. Also suitable for curing conductive carbon, silver and copper inks, two-component systems and other thermally cured coatings.

Applications

• Predrying and final curing of photoimageable soldermask
• Curing of carbon, silver, copper and heatsink pastes
• Curing of two-component inks, resins and insulating materials
• Used across printing, electronics, plastics, textiles, packaging, automotive and glass industries

Technology
Curing is achieved by combining long-wave IR radiation with circulating hot air. A conveyorised flat-belt (or V-belt) carries each substrate through a selectable temperature profile. Double-sided curing is possible. The IR plus circulating air combination reduces curing time significantly compared with batch ovens (typical reductions down to about 1/6).

Typical process times (examples)

• Final curing of photoimageable soldermask: about 8–10 minutes
• Tack drying of photoimageable soldermask: about 4–5 minutes
• Curing of carbon, silver, copper and heatsink pastes: about 1–3 minutes

Control
PLC control with touch-screen panel monitors and manages all functions. Up to 10 programs can be saved and a print/export function supports process control and documentation.

Advantages

• Short curing cycles compared with batch processes
• Uniform, complete thermal curing
• Option for integrated UV curing
• Energy-efficient, modular design
• Immediate downstream processing possible
• Improved surface hardness, gloss and chemical resistance

Available modules

• Stabilization (calming) module
• Evaporation / exhaust module
• Heating module
• Cooling module
• Various inlet / outlet modules
• Mobile console with PLC touch-screen

Technical specifications (summary)

• Working widths: 610 mm (24 in) or 760 mm (30 in)
• Belt speed: adjustable
• Tack drying soldermask speed range: 0.5 - 50.0 m/min
• Curing soldermask speed range: 0.2 - 2.0 m/min
• Curing paste speed range: 0.5 - 5.0 m/min
• Temperature range: RT - 250 °C
• Electrical connection: 400 V 3/N/PE 50 Hz
• Connecting power per module: 9.3 kW / 18.6 kW
• Working power per module: 4.6 kW / 9.3 kW
• Supply air / exhaust air per module: 100 - 300 m³/h
• Module dimensions (per module): length 1000 mm, width 1000 mm, height 1200 mm