A calender includes a rotatable roller, and a belt co-acting with the roller with a determined belt pressure. At least one material for feeding through the calender is situated between the roller and the belt for a determined contact time during throughfeed through the calender. The calender also includes means for heating the fluid and/or the roller, control means for controlling the heating means and/or the belt pressure and/or the contact time, and at least one first temperature sensor for measuring the temperature of an outer periphery of the roller and at least one second temperature sensor for measuring the temperature of the fluid. The control means are configured to control the heating means and/or the belt pressure and/or the contact time on the basis of the measured outer periphery temperature and the measured fluid temperature. A set with a plurality of such calenders and a method for controlling such a calender.

A calender includes a rotatable roller, and a belt co-acting with the roller with a determined belt pressure. At least one material for feeding through the calender is situated between the roller and the belt for a determined contact time during throughfeed through the calender. The calender also includes heating means for heating the fluid and/or the roller, control means for controlling the heating means and/or the belt pressure and/or the contact time, and a database for storing data. The control means are configured to control the heating means and/or the belt pressure and/or the contact time on the basis of at least one of the data contained in the database, before and/or during throughfeed of the material. A set with a plurality of such calenders and a method for controlling such a calender.

A calender includes a rotatable roller, and a belt, co-acting with the roller with a determined belt pressure. At least one material for feeding through the calender is situated between the roller and the belt for a determined contact time during throughfeed through the calender. The calender also includes heating means for heating the fluid and/or the roller, control means for controlling the heating means and/or the belt pressure and/or the contact time, and flow influencing means for initiating and/or influencing a flow of the fluid in the internal space. The control means are configured to control the flow influencing means and thereby the flow of the fluid in the internal space in freely settable manner. A set with a plurality of such calenders and a method for controlling such a calender.

A sheet manufacturing apparatus has a heating/compressing unit configured to form a sheet by heating and compressing material including fiber and resin, and the heating/compressing unit includes a first rotating body that rotates, and a second rotating body that rotates in contact with the first rotating body. The sheet manufacturing apparatus holds, heats, and compresses material by the first rotating body and the second rotating body. The sheet manufacturing apparatus includes a heating unit that heats the outside surface of at least one of the first rotating body and second rotating body.

A method for the monitoring and control of the operating conditions of a fiber web machine or paper finishing machine, where the monitoring and control are performed on a rotatable machine element (41) equipped with a sensor assembly (24) that measures temperature, and generates a measurement signal (25), and a cross-directional temperature profile (21) of the machine element is generated from the measurement signal. One or more reference profiles (35) are generated for the cross-directional temperature profile of the machine element. The cross-directional temperature profile of the machine element generated from the measurement signal and at least one reference profile generated for it are compared to find a change concerning the operating conditions of the fiber web machine or paper finishing machine, and actions are performed on the basis of said change. The invention also relates to a corresponding system, a rotating machine element and a computer program product.

A sheet manufacturing apparatus having a compactly configurable heating/compressing unit that heats and compresses material efficiently.

A sheet manufacturing apparatus having a heating/compressing unit configured to form a sheet by heating and compressing material including fiber and resin, the heating/compressing unit including a first rotating body that rotates, and a second rotating body that rotates in contact with the first rotating body, and holding, heating, and compressing material by the first rotating body and the second rotating body; and the sheet manufacturing apparatus including a heating unit that heats the outside surface of at least one of the first rotating body and second rotating body.