Alteco_EN - 第3页

Saves space through vertical transport principle  T argetedairfeedintheheatingzonesforreproducibletemperatureproles  Pre-heatedsupplyair;thevolumeowcanbesetforeachheatingzone Minimal heat emiss…

Hardening of coated printed circuit boards

vertically with minimal space required

Air bags in cars can save lives, headlights ensure a safe trip day and night, the on-board

computer and the sensor system in a plane determine reliable measurement gures for

ight guidance even at an altitude of 10,000 metres and a simple trac light switching

system regulates trac in all weathers. Behind each of these functions lie highly complex

electronic sub-assemblies and connections.

In order to ensure the reliability of these sensitive electronic sub-assemblies even in difcult

environmental conditions, a coat of paint is applied to the printed circuit board and then dried

in a special drying system. The coating protects the electronics from damage due to corro-

sion or other environmental influences such as moisture, chemicals and dust. It increases

the lifetime and quality of the product many times over. Alternatively, complete sub-assem-

blies are cast and encapsulated.

For this area of application, Rehm Thermal Systems provides innovative drying and harden-

ing procedures that meet every requirement. The latest development is a vertical drying sys-

tem which offers maximum performance with minimal space required. All industries which

implement painting processes and process sensitive sub-assemblies with a protective paint

coating can benet from this system.

Drying |

Hardening

High quality and reliable

function of electronics

Saves space through vertical transport principle

 Targetedairfeedintheheatingzonesforreproducibletemperatureproles

 Pre-heatedsupplyair;thevolumeowcanbesetforeachheatingzone

Minimal heat emission due to outstanding insulation

 Thewasteairvolumecanbeadjusteddependingontheheatingzone

 Downstream,segmentedcoolingtract

No thermal stress on the system mechanics due to external drive technology

Optimum accessibility of the system technology and easy maintenance

Uncompromising modern process

with the new Alteco from Rehm

The Rehm Vertical Drying System Alteco not only offers ideal drying and hardening processes, it is also extremely compact

and space-saving thanks to its design. As a result of the vertical transport, the Alteco replaces, with a system length of only

around 4 m, a comparable 40 m long horizontal furnace. With the innovative system design, you can save valuable space in

your production hall.

Two transport variants are available for the vertical dryer:

1. xed transport width, where the circulating goods carriers

are set to a xed measurement

2. flexible transport width, where the transport by means of

circulating goods carriers is automatically set to the

respective circuit board size

Several painting lines can thus feed different products with

different circuit board transport widths in the mix to the Alte-

co. With the Alteco, printed circuit boards with a maximum

height of 50 mm can be dried.

Technical details

An overview of the Alteco

The vertical drying system Alteco allows flexible, high-perfor-

mance drying and hardening processes of all protective paints

and casting compounds that can be hardened with convec-

tion heat. The system consists of two process towers, which

are each divided into four heating zones, and a downstream,

segmented cooling tract. The circuit boards are loaded into

goods carriers at the furnace infeed. These run through the

drying process in the system in a vertical direction and are

stacked on top of each other during the hardening process.

minimal

space required

1. Infeed/loading

In the infeed area, the painted sub-assembly

is handed over to the transport system via the

supply belt. Sensors record the width for each

circuit board. A grabber pushes the circuit

board onto the goods carrier, which is previous-

ly adjusted to the width of the printed circuit

board to be loaded and measured. During the

loading process, each goods carrier is precisely

xed, positioned and centred. A multiple load-

ing of the goods carrier is possible.

4. Air feed

The heating system in the process towers

works according to the convection principle

in circulating air operation. The tempera-

ture can be separately regulated in all eight

heating zones. A specially developed air feed

guarantees even warming of all construction

elements. The supply air can be pre-heated

and pre-set individually in the volume flow

depending on the heating zone. The waste air

volume is also separately regulated per zone.

The system can thus be ideally coordinated to

the volume of paint and the solvent throughput.

2. Circulating transport system

The sub-assembly in the goods carrier is

transported through the system on a circulat-

ing goods carrier mechanism. The cycle time

is adjustable. Via a cross-beam, the goods

carriers are moved under the ascending tower,

where they are taken over by a stroke mech-

anism. After running through the towers, the

goods carriers are transported to the unloading

station by means of a second cross-beam.

The empty goods carriers are clocked into the

loading station again.

5. Cooling tract

The downstream cooling tract consists of three

transport segments that adapt automatically

to the respective transport width. Cooled air is

blown from above and below onto the sub-as-

sembly per segment. Via a heat exchanger, the

waste air is handed over from the internal to

the external water cycle and thus transported

away from the production room in an energy-

efcient manner.

3. Clever stacking principle

The mechanics during the drying process in

the process towers work according to a vertical

stacking principle. The stroke mechanism

stacks the goods carriers over one another.

They are equipped with spacer pins so that they

are securely positioned. No running chains, oils

or lubricants are necessary for the entire trans-

port. A transfer transport mechanism hands

over the goods carriers at the highest point

into the descending tower. The de-stacking is

done in reverse order. All drives and mechanical

guideways are in the cold process area, for

reliable and long-lasting transport.

6. Software

The system is controlled by software via a touch

interface. All relevant process parameters are

documented. The width setting and the precise

positioning of the goods carriers thus run fully

automatically. In addition, the loading status of

the goods carriers and the internal temperature

of the heating zones (among other things) can

be monitored. SMEMA interfaces ensure the in-

tegration of the system in each production line.