Surface dryer

Surface dryer

For drying after flocking, the flocked workpieces can be dried with the help of a cabinet or continuous dryer. A distinction is made between dryers that are suitable for water-based adhesives or dispersion adhesives.

Drying oven for water-based adhesives

• horizontal airflow for an operating temperature up to 160°C,
• adjustable louvre blades on the air inlet side for optimum air distribution
• Double-leaf door at the front for loading and unloading, secured with limit switch, dryer function, lockable with external customer-side exhaust air ventilation via potential-free contact
• Inner and outer casing made of galvanised sheet steel, glass wool insulation of 100 mm thickness on all sides
• 2 rails are provided in the bottom of the dryer for the insertion of trolleys.
• Control box
• Temperature control by controller with digital actual value display and analog setpoint adjustment, load switching by solid-state relay, with separate overtemperature protection
• Rear wall with separate bursting flap, locked via spring element
• Internal dimensions: 1600 mm high, 1100 mm wide, 850 mm deep
• External dimensions: 1990 mm high (with blower motor 2320 mm), 1640 mm wide (with control box 1860 mm), 1150 mm deep
• Voltage: 3 x 400 V 3 Ph/PE, 50 Hz, control voltage: 230 V, 50 Hz, with transformer
• Total heat output: 22.5 kW, of which base load: 15 kW, of which additional load: 7.5 kW
• Blower motor power: 1.1 kW
• Total connected load: 23.6 kW
• Exhaust air volume free-blowing 60 - 200 m3/h , depending on the position of the air flap
• Exhaust air pipe connection: 130 mm
• Painting: Exterior RAL 7035 light grey textured paint

Continuous dryer for dispersion adhesives

The basic structure is assembled from plate elements, which are manufactured as double-walled sheet steel cassettes. The individual elements are made of electrolytically galvanised sheet steel. They are smooth on both sides and insulated with rock wool solid mats according to DIN 4102, 100 mm thick. For access to the dryer, 6 panels each can be removed on both long sides by loosening quick-release fasteners. The height of the entry and exit openings of the conveyor belt can be adjusted by a cover plate each.

The dryer is heated by electric finned tube heaters and is divided into three heating circuits.

• Heating load: 6 heating elements at 2.0 kW each = 12.0 kW
• Base load: 12 heating elements at 2.0 kW each = 24.0 kW
• Control load: 6 heating elements at 2.0 kW each = 12.0 kW
• Air flow max. 14 000 m³/h.

The dryer is designed for a maximum circulating air temperature of 100 °C. The hot air is blown into the drying chamber via the ceiling through air ducts with supply air grilles with adjustable fins from the centre of the dryer. Extraction is via a return air duct with intake grilles above the floor in the centre of the dryer. Thus, the workpieces are exposed to air from all sides, so that a uniform drying is guaranteed. The unit box is mounted on the side of the dryer housing and contains the complete heating zone with built-in heating coil. The temperature is controlled by a Pt 100 resistance thermometer and the electronic three-point step controller with digital display installed in the control cabinet. In addition, the dryer is equipped with a safety thermostat for overtemperature limitation.

A pressure sensor for monitoring the recirculation system is installed in the recirculation air duct (fan), which automatically switches off the heating device if the recirculation fan fails. After the dryer has been switched off, the circulating air fan has a fixed follow-up time of 5 minutes. This serves to protect and cool down the heating elements and to ventilate the dryer compartment. The speed of the circulating air fan is frequency-controlled and can be adjusted to the technical production requirements by means of a potentiometer in the control cabinet.

In front of the heating chamber, an exhaust air connection, Ø 150 mm, is installed on the pressure side with a built-in, lockable regulating flap for connection to on-site piping above the roof.

Technical data:

• Heating medium: Electric
• Heating capacity: 48 kW
• Recirculation fan: 4.0 kW
• Recirculation air volume: approx. 14,000 m³/h
• Exhaust air dryer: approx. 200 m³/h
• Electr. total connected load: 75 A
• Total dryer length: 10.0 m
• Belt width: 1100 mm
• Clear passage height: 400 mm