7 PRINCIP E-trolleys are brought into the kiln by feeders. The kiln is also available with equipment for automatic loading. Axial fans located on a deck above the timber load blow circulation air between the piles (in the timber’s longitudinal direction). Lamella-type heat coils give maximum heat transfer. After initial equalisation of moisture content, the heating level is adapted to how the moisture content is changing. Making use of the pressure difference, the moist air is evacuated via two ducts on either side of the load. Photo: Christina Brandin Englund, Svenskt Trä Flexibility and exact control. Batch kilns give great flexibility as regards type of wood and dimensions. Exact control of the climate throughout the drying process provides optimum conditions for satisfying all requirements in respect of high processing quality and customisation. This type of kiln delivers drying right down to the target moisture content and minimises the risk of checking. Building system and fans. The drying facility is normally built in stainless steel and air circulation is controlled by axial fans. All sensitive equipment is located in the building’s ventilated “cold attic”. Leading research and development, both Nordic and international, is the basis of all our design solutions (see Technical solutions, pages 10 – 11). Kilns can advantageously be fitted with heat recovery systems. Volume and target moisture content. Valutec’s e-trolley fed batch kilns are particularly adapted for planks, but can also be used for boards. Batch volume can vary from 50 to 450 m3 (21 – 190 MBF) and target moisture content from 5 – 20%. E-trolley feeding is a good choice if large batch volume and high productivity are a major priority. Because loading and unloading are in the kiln’s longitudinal direction, a large number of kilns can be placed side by side. Loading the timber outside the kiln minimises pulling time.
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