Method and apparatus for the continuous and discontinuous production of boards of ligneous material

An apparatus for the production of ligneous material boards comprising:

• a continuously operating hot press including two flexible endless steel bands;
• a press table;
• a press ram;
• a first water spray cooling apparatus of variously adjustable length with water spray nozzles adapted to directly spray water onto the surfaces of the boards and calendar rolls to put the board under light pressure;
• and
• a second cooling apparatus, wherein the second cooling apparatus is a double-band hold-down apparatus which can travel in a cooling range of the first water spray cooling apparatus and having a plurality of rows of coolant spray nozzles disposed on the backs of the band surfaces of the double-band hold-down apparatus which provide contact on the boards.

A method for the production of boards of ligneous material comprising:

• forming a press material mat treated with a binding agent;
• introducing the mat between the steel bands of a discontinuously operating hot press;
• applying pressure and heat to the mat in the discontinuously operating hot press;
• curing the mat into a hot board strand;
• moistening both surfaces of the hot board strand;
• shock cooling the hot board strand with sprayed water in a first cooling section with an evaporation zone variable in its length and adaptable to the thickness of the board strand wherein the board strand is held between endless blocking bands under multiple calendar rolls;
• and
• carrying the board bands to a directly adjoining second cooling section under a predetermined light pressure through a double-band hold-down apparatus wherein the backs of the hold-down bands are sprayed with a coolant.

A method for the production of boards comprising:

• forming a press material mat treated with a binding agent on a continuously moving spreading band;
• introducing the mat between steel bands of a continuously operating hot press;
• applying pressure and heat to said mat in the continuously operating hot press;
• curing the mat into a hot board strand in the continuously operating hot press;
• then
• moistening both surfaces of the hot board strand;
• shock cooling the hot board strand with sprayed water in a first cooling section with an evaporation zone variable in its length and adaptable to the thickness of the board strand wherein the board strand is held between endless blocking bands under multiple calendar rolls;
• and
• carrying the board strand to a directly adjoining second cooling section under a predetermined light pressure through a double-band hold-down apparatus wherein the backs of the hold-down bands are sprayed with a coolant;
• wherein the boards are selected from the group consisting of plastic boards and plastic boards from a combined portion of wood and plastic, and from plastic with and without reinforcing inserts.