1 - Chips and shavings from typically spruce and fir are retrieved as waste from the manufacture of other timber products.
2 - The chips are ground down into wood fibre pulp
3 - The pulp is mixed with water and paraffin or latex added as binder
4 - The mix is pumped into a forming box as a continuous fibre mat.
5 - Around half the water is removed through pressing and vacuum pumping.
6 - The board material is dried in an air drier.
7 - The boards are cut to size and the edges milled.
• Maximum sheet thicknesses are around 25mm. Thicker sections are built-up though the gluing together of sheets with white glue.
The 'Dry' process
( Image courtesy: GUTEX )
1 - Chips and shavings are retrieved as waste from other timber manufacturing processes.
2 - The fibres are sprayed with paraffin
3 - The sprayed fibres are dried using warm air
4 - The fibres are sprayed with polyurethane resin as a binder
5 - The fibre mats are placed in a unit where the resin is cured and hardened through exposure to a mixture of air and water vapour.
• The dry process produces single-ply boards up to around 240 mm in thickness.
Images from a 'wet' production cycle
Wood chips and shavings are mixed with water (image courtesy: Gutex)
The wood-water mix is delivered into a mould (image courtesy: Gutex)
The mix is prepared for pressing (image courtesy: Gutex)
The mix after pressing (image courtesy: Gutex)
The material is dried in a warm air unit (image courtesy: Gutex)
The boards are sawn milled and packed ready for dispatch (image courtesy: Gutex)
The manufacture of Hofatex wood fibre insulation
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