RDS_Lacktrockner_en.pdf - 第7页

7 When drying using the convection process, the process atmosphere is heated up using a hot-air fan and then flows onto the components. The heating elements are attached above and below the transport system. The flow spe…

Optimum heat management

with IR radiation and convection

Thanks to our many years of experience, we

know precisely which actuators are needed to

set up a system that can be adapted simply and

individually to the various process requirements

and product landscapes of our customers.

The RDS systems are modularly structured.

The efcient upper and lower heaters work with

infrared radiation (IR) and/or convection to dry the

various materials reliably. By implementing these

two heat transfer processes, the systems are

optimally designed for the processing of lacquers

and castings containing solvents. The RDS drying

oven thus consists of several separately adjusta-

ble heating zones. In the warming-up phase, the

component and the protective lacquer are heated

up. Both the upper and lower IR radiators can be

controlled with different set-point temperatures.

Thus in the inlet area of the dryer, an increased

amount of IR radiation and a reduced convective

heat transfer is applied to the component. This

means that lacquers in particular are heated up

evenly and, thanks to the low convection, are not

dispersed onto the component.

In the drying phase, the temperature is main-

tained until the material has hardened completely.

A stronger convection is needed for this, as the

evaporating solvents need to be discharged. In the

subsequent cooling phase, the components are

cooled down gently.

When drying using the convection process, the process

atmosphere is heated up using a hot-air fan and then flows

onto the components. The heating elements are attached

above and below the transport system. The flow speeds of

the upper and lower heating zones are individually adjus-

table so that the component is heated through evenly. This

prevents tension in the material.

Convective drying

In the combination heating process, the heat transfer is car-

ried out with infrared radiation, which is supported by central

convection heating. All heating chambers are equipped with

high-performance IR radiators. The IR radiation penetrates

the circuit board and drives out the solvents from the interior.

This enables a faster and more efcient drying process. For

the additional convection, the volume flow can be pre-set.

The heating base of all IR radiators can also be equipped

with glass covers to protect against contamination and for

easier cleaning.

Combination heating process with IR

First-class heating performance and top heat management

Upper and underside heating using convection and/or IR heating elements

Variable heating chamber length and optimum process adjustment

Flexible transport systems based on customer request

The RDS drying systems can be designed as single lane or

dual lane transport, with a pin chain conveyor and variable

width adjustment or as heavy load transport for goods

carriers based on the customer’s requirements. The optional

underfloor return transport that can be integrated offers a

space-saving solution for circuit board/goods carrier return.

The following transport variants are available:

› Single lane transport: 80 – 460 mm

› Dual lane transport: 2 x 90 – 250 mm

› Heavy load transport: based on customer requirements

Transport system

Transport

Internal temperature monitoring

For optimum hardening of the components, the RDS dryers

feature internal temperature monitoring. Thermal elements

have been installed in every heating zone, which precisely

measure the temperature in the system. The values are

displayed on the monitor. As soon as the tolerance values

are exceeded, an acoustic alarm signals and the heating is

switched off.

The exceptional thermal insulation of heating

zones and the individually adjustable tempera-

tures allow for optimum proling of your drying

processes – which are perfectly adapted to the

requirements of the products.

The exhaust system ensures safe removal of solvents

among other things. Appropriate mechanisms are attached

to the input and output of the process chamber, as well

as between the heating zones. The process exhaust air is

supplied directly to the extraction through the fan. The sub-

stances to be hardened and the exhaust products released

determine the extraction volume. The extraction function

is monitored by a pressure sensor. If there is a problem, the

heating switches off automatically and the inflow of new

components is stopped. This prevents any flammable gas

mixtures from forming in the system.

Optimum proling capability

Exhaust system and integrated extraction

Temperature curve

Process stability

thanks to clever features