Drying

Pulp and cellulose fibre
Today there is a rising demand for cellulose fibre packages adapted for recycling. Local as well as international companies have become environmentally aware, which make them favour packages made from cellulose fibre in place of plastics.

At Celtec Developments' new plant in Vaggeryd, Sweden, troughs for foodstuff are made from cellulose fibre. After the troughs have been vacuum formed, they pass through a continuous microwave drier where they are dried.
http://www.celtec-packaging.com/

Paint
For painting of wood water soluble types of paint are often used. By using microwave energy technology (continuous drier) a faster drying process and a better quality can
be achieved.

Gisip has supplied a continuous drier to Eurocoustic in France. This drier is used for drying painted  sound insulating boards. Drying by means of microwaves is fast and the paintwork acquires a smooth and good looking finish.

Assembled and bulky painted products are more readily dried in a batch drier. In this type of drier, one or a number of products are placed to be dried. Fonus, which is Sweden's largest producer of coffins uses this technology from Gisip.

Wood
In many countries with important forest industry, among them Sweden, an intense development work is going on with the aim to increase the level of processing of timber in such a way that it is given new qualities before it is sold. Today, almost all sawn wood is dried by hot air drying in chamber or travelling driers, a method which takes a long time, usually several weeks. In addition, the level of rejection is rather high.

Extensive tests of the use of microwaves have shown very good results concerning drying time in the same time as the amount of damage caused by the drying process has been reduced. In addition, the timber acquires new qualities in the drying process which give it a better value on the market.

Gisip has designed a microwave oven for laboratory work at the Luleå Institute of Technology (Luleå Tekniska Högskola) and has a close cooperation with their department for research in the field of wood drying technology.


 

Biological Material

The  view of what was formerly seen as troublesome, messy and smelly waste from restaurants, catering services, private homes and grocery stores is now dramatically changing. Fruit, vegetables, meat and fish which are no longer useful for food nevertheless contains valuable nutritive substances which are of valuable when recycling.

When drying the biological material with microwaves, the  weight is reduced by 70-80 percent and the volume is dramatically reduced, which leads to lower costs of transportation. The dried remnants are free from smell and easy to handle.
http://www.sik.se/


 

Other Drying Processes
Microwave energy technology combined with air treatment is used in many other drying processes. A few examples:

Drying of blacked moulds of sand for casting shops
Drying of cheramical materials, e.g. in basins and water closets
Drying of various fruits and vegetables
Drying of solvent solvable paints with recirculation of the solvent in a combined microwave and vacuum oven
Drying of plastic granulate before moulding.

Foodstuff
When heating foodstuff pasteurization is achieved which leads to better keeping qualities reduces the need of preservatives. When producing bread the rising process can be shortened by means of microwaves.
 

Glue
By using microwave energy technology glue sets in faster and makes a more efficient production possible, e.g. when producing cardboard packing which is to be made without interruption.
http://www.ergodesign.se/

Paint Removal
Microwave energy technology is well suited for paint removal at careful renovation, e.g. of windows and doors in old buildings of historical value. By means of microwaves the paint can be dissolved without damaging neither wood nor irreplaceable hand made window panes.

Other Heating Processes
Microwave energy technology is also suitable for heating in many other processes:

Heating and sterilization of liquids
Preparing of furniture timber for steaming
Heating of solid organic material
Vulcanisation of rubber
 

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