Process for the production of particle board or wood fiber board

A process for production of particle board, MDF board or HDF board,

• wherein the process comprises a step of recycling particle board material, MDF and/or HDF board material in which recycled chips and/or recycled wood fibers are produced;
• and
• wherein the process comprises a step in which the particle board material, the MDF and/or HDF board material is wetted, heated and pressurized;
• wherein this material is kept under pressure and at an elevated temperate for a certain time;
• wherein the process comprises a step of steam explosion of the wetted, heated and pressurized particle board material, MDF and/or HDF board material, in which recycled chips and/or recycled wood fibers are produced during the steam explosion;
• wherein the steam explosion is a multistage steam explosion, such that expansion of the pressure occurs in a number of steam explosion steps, wherein the pressure drop during each of the steam explosion steps is less than 10 bar;
• wherein the process comprises a step of supplying the recycled chips and/or the recycled wood fibers as a first base material in a production process for particle board, MDF board or HDF board.