Wood material board hot-pressing device and operation process for such a device

A wood material board hot-pressing device, comprising:

• a primary circuit, which comprises:
• a supply pipe which discharges hot heat transfer fluid from a heat generator;
• and
• a return pipe which supplies cooled heat transfer fluid to the heat generator;
• a secondary circuit, which comprises:
• a pressing device which presses wood material boards;
• a supply channel which supplies heat transfer fluid to the pressing device;
• and
• a return channel which returns the cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which comprises:
• a control valve;
• and
• is set up to regulate a flow of the heat transfer fluid from the primary circuit to the secondary circuit;
• and
• a variable output secondary circulation pump, which is set up to circulate the heat transfer fluid in the secondary circuit,
• wherein the controlling device comprises:
• a heat output recording device;
• and
• is configured to automatically regulate a level of heat output to be supplied to the pressing device, and
• wherein:
• the heat output recording device comprises:
• a volumetric flow gauge which records volumetric flow of the heat transfer fluid through the secondary circuit;
• an inlet temperature gauge which measures an inlet temperature of the heat transfer fluid which flows in the secondary circuit to the pressing device;
• and
• a return temperature gauge which measures return temperature of the heat transfer fluid, which flows from the pressing device in the secondary circuit;
• and
• the controlling device is set up to automatically regulate heat output by reference to the volumetric flow and a temperature difference between the inlet temperature and the return temperature in the secondary circuit.

A wood material board hot-pressing device, comprising:

• a primary circuit, which comprises:
• a supply pipe which discharges hot heat transfer fluid from a heat generator;
• and
• a return pipe which supplies cooled heat transfer fluid to the heat generator;
• a secondary circuit, which comprises:
• a pressing device which presses wood material boards;
• a supply channel which supplies heat transfer fluid to the pressing device;
• and
• a return channel which returns the cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which comprises:
• a control valve;
• and
• is set up to regulate a flow of the heat transfer fluid from the primary circuit to the secondary circuit;
• and
• a variable output secondary circulation pump, which is set up to circulate the heat transfer fluid in the secondary circuit,
• wherein the controlling device comprises:
• a heat output recording device;
• and
• is configured to automatically regulate a level of heat output to be supplied to the pressing device, and
• wherein the primary circuit comprises:
• a variable-output, comprising a speed-controlled, primary circulation pump;
• and
• a differential pressure sensor, by which a primary pressure difference between an initial pressure of the heat transfer fluid in the supply pipe and the return pressure of the heat transfer fluid in the return pipe is calculated,
• wherein the primary circulation pump in the primary circuit is set up to regulate the output according to a target primary pressure difference.

A wood material board hot-pressing device, comprising:

• a primary circuit, which comprises:
• a supply pipe which discharges hot heat transfer fluid from a heat generator;
• and
• a return pipe which supplies cooled heat transfer fluid to the heat generator;
• a secondary circuit, which comprises:
• a pressing device which presses wood material boards;
• a supply channel which supplies heat transfer fluid to the pressing device;
• and
• a return channel which returns the cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which comprises:
• a control valve;
• and
• is set up to regulate a flow of the heat transfer fluid from the primary circuit to the secondary circuit;
• a variable output secondary circulation pump, which is set up to circulate the heat transfer fluid in the secondary circuit;
• and
• a moisture gauge programmed to measure water content of the wood material boards which are brought into the pressing device, wherein the controlling device is connected to the moisture gauge and is set up to automatically alter heat output according to the water content,
• wherein the controlling device comprises:
• a heat output recording device;
• is configured to automatically regulate a level of heat output to be supplied to the pressing device;
• and
• is programmed to automatically increase the target primary pressure difference, if the control valve is in a maximum position and heat output is to be increased.

A wood material board hot-pressing device, comprising:

• a primary circuit, which comprises:
• a supply pipe for discharging hot heat transfer fluid from a heat generator;
• and
• a return pipe for supplying cooled heat transfer fluid to the heat generator;
• a secondary circuit, which comprises:
• a pressing device which presses wood material boards;
• a supply channel which the supplies heat transfer fluid to the pressing device;
• and
• a return channel which returns of cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which comprises:
• a control valve and is set up to regulate a flow of the heat transfer fluid from the primary circuit to the secondary circuit,
• wherein the control valve is a two-way control valve which includes a position indicator, and
• the controlling device is programmed to automatically increase a target primary pressure difference, if the control valve is in a maximum position and heat output is to be increased.

A method for operation of a wood material board hot-pressing device comprising:

• a primary circuit, which comprises:
• a supply pipe for discharging hot heat transfer fluid from a heat generator;
• and
• a return pipe for supplying cooled heat transfer fluid to the heat generator;
• and
• a primary circulation pump for circulation of the heat transfer fluid;
• a secondary circuit, which comprises:
• a pressing device for compression of wood material boards;
• a supply channel for supplying of the heat transfer fluid to the pressing device;
• and
• a return channel for returning of the cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which contains a control valve,
• the method comprising controlling heat output which is supplied to the pressing device by altering flow of the heat transfer fluid from the primary circuit to the secondary circuit through reference to volumetric flow and a temperature difference between an inlet temperature and return temperature in the secondary circuit.

A wood material board hot-pressing device, comprising:

• a primary circuit, which comprises:
• a supply pipe for discharging hot heat transfer fluid from a heat generator;
• and
• a return pipe for supplying cooled heat transfer fluid to the heat generator;
• a secondary circuit, which comprises:
• a pressing device which presses wood material boards;
• a supply channel which the supplies heat transfer fluid to the pressing device;
• and
• a return channel which returns of cooled heat transfer fluid to the primary circuit;
• and
• a controlling device, which comprises:
• a control valve and is set up to regulate a flow of the heat transfer fluid from the primary circuit to the secondary circuit,
• wherein the control valve is a two-way control valve which includes a position indicator, and
• the controlling device controls heat output by altering flow of the heat transfer fluid from the primary circuit to the secondary circuit through reference to volumetric flow and a temperature difference between an inlet temperature and return temperature in the secondary circuit.