Process for the production of recycled lignocellulose fragments

A process for the production of recycled wood fibers, wherein the process comprises a first step in which refined material from recycled lignocellulose based boards or panels is introduced into a receptacle, and wetted, heated and pressurized using steam;

• wherein the process comprises a second step in which this material is kept under pressure and temperature for a certain amount of time in said receptacle,
• wherein the process comprises a third step of steam explosion of the wetted, heated and pressurized material, in which the pressure in the receptacle is reduced by at least 3 bar;
• and in which recycled wood fibers are produced during said steam explosion;
• wherein the steam explosion is a multistage steam explosion, meaning that the reduction of the pressure takes place in at least two partial steps, wherein the multistage steam explosion comprises at least a first partial step,
• wherein the pressure in the receptacle is reduced, and a subsequent second partial step
• wherein the pressure in the receptacle is further reduced,
• wherein a first ratio of the pressure drop in the first partial step to the duration of the reduction of the pressure in the first partial step, is lower than a second ratio of the pressure drop in the second partial step to the duration of reduction of pressure in the second partial step.

A process, for the production of recycled wood fibers, wherein the process comprises a group of sequential steps, and the process makes use of at least a first receptacle and a second receptacle,

• wherein said group of sequential step take place in the first receptacle and
• wherein said group of sequential steps also takes place in the second receptable, wherein said group of sequential steps at least comprise
• a first step in which refined material from recycled lignocellulose based boards or panels is introduced into the first receptacle or respectively the second receptacle, and is wetted, heated and pressurized using steam;
• a second step in which this material is kept under pressure and temperature for a certain amount of time in the first receptacle or respectively the second receptacle,
• a third step of steam explosion of the wetted, heated and pressurized material, in which the pressure in the first receptacle or respectively the second receptacle is reduced by at least 3 bar;
• and in which recycled wood fibers are produced during said steam explosion;
• wherein to reduce the pressure in the first receptacle or respectively the second receptacle in the third step, steam is released from the first receptacle or respectively the second receptacle and at least partially reused for pressurizing the second receptacle or respectively the first receptacle, and this at the time the first step takes place in the second receptacle or respectively the first receptacle, such that the steam is partially reused.

A process for the production of recycled wood fibers, wherein the process comprises a first step in which refined material from recycled lignocellulose based boards or panels is introduced into a receptacle, and wetted, heated and pressurized using steam;

• wherein the process comprises a second step in which this material is kept under pressure and temperature for a certain amount of time in said receptacle,
• wherein the process comprises a third step of steam explosion of the wetted, heated and pressurized material, in which the pressure in the receptacle is reduced by at least 3 bar;
• and in which recycled wood fibers are produced during said steam explosion
• wherein the receptacle comprises a pressure vessel in which refined material from recycled lignocellulose based boards or panels is introduced,
• wherein the receptacle comprises a stirring mechanism,
• wherein this stirring mechanism comprises one or more agitators located in said pressure vessel to mix the refined material in the receptacle at least for a portion of the time period of the first step and/or the second step.