A self-compensating tube assembly is disclosed for use in a doctor blade holder. The self-compensating tube assembly includes a tube including a membrane that encloses a liquid with a substantially invariable bulk modulus of elasticity, density and viscosity; and chatter responsive for providing any of monitoring means of blade chatter through pressure, damping of blade chatter, and minimizing blade chatter.

Vibration sensors can be used in paper making systems and methods to determine various aspects of the paper making operation. Vibration sensors, for example, positioned on cleaning blades configured to clean various deposits off of rollers in a paper making system can output vibration data that can be indicative of the vibration of the blade. The vibration data can be analyzed in order to characterize the cause of the vibration and/or the location of the vibration within a paper making system. If the vibration data satisfies a predetermined condition, a corrective action can be initiated. Different corrective actions can be initiated based on the characterized cause and/or location of the vibration in order to effectively improve the operation of the system while minimizing costly system shut downs and major maintenance.

Vibration sensors can be used in paper making systems and methods to determine various aspects of the paper making operation. Vibration sensors, for example, positioned on cleaning blades configured to clean various deposits off of rollers in a paper making system can output vibration data that can be indicative of the vibration of the blade. The vibration data can be analyzed in order to characterize the cause of the vibration and/or the location of the vibration within a paper making system. If the vibration data satisfies a predetermined condition, a corrective action can be initiated. Different corrective actions can be initiated based on the characterized cause and/or location of the vibration in order to effectively improve the operation of the system while minimizing costly system shut downs and major maintenance.

A creping blade and a preparation method thereof are provided. The creping blade comprises a base, wherein a wear-resistant coating is provided on the top of the base, and a protective layer is arranged below the wear-resistant coating at the contact point between the creping blade and a dryer, and the hardness of the protective layer is lower than that of the surface of the dryer of a paper machine. The creping blade of the invention is advantageous in that the friction portion of working surface has an unlimited area and has a high wear-resistant coating, and the paper impact portion has high wear resistance and high impact resistance, so that the creping blade has a long service life, which can be several times or even tens of times that of the common steel creping blade.

The doctor blade holder (7) comprises: a plurality of fingers (35) mounted on a beam (9), hinged around a rotation axis (37A) and configured to cumulatively form a housing seat (41) for the doctor blade (43); wherein the fingers (35) are pivotable independently from one another around said rotation axis (37A); at least one actuator (51) comprising at least one chamber (53) that can be inflated with pressurized fluid, configured and arranged so as to generate a thrust (f53) on the fingers (35) to make them pivot around said rotation axis (37A). Each finger (35) can be mounted and removed independently from the others on said beam (9).

The doctor blade holder (7) comprises: a plurality of fingers (35) mounted on a beam (9), hinged around a rotation axis (37A) and configured to cumulatively form a housing seat (41) for the doctor blade (43); wherein the fingers (35) are pivotable independently from one another around said rotation axis (37A); at least one actuator (51) comprising at least one chamber (53) that can be inflated with pressurized fluid, configured and arranged so as to generate a thrust (f53) on the fingers (35) to make them pivot around said rotation axis (37A). Each finger (35) can be mounted and removed independently from the others on said beam (9).

A doctor blade holder (7) for a doctor blade (43) adapted to coact with a cylindrical surface (1S) of a rotating cylinder (1). A plurality of fingers (35) are mounted on a beam (9), hinged around a rotation axis (37A) and configured to cumulatively form a housing seat (41) for the doctor blade (43). The fingers (35) are pivotable independently from one another around the rotation axis (37A). At least one elastic thrust member (51) is configured and arranged to generate a thrust on the fingers (35) to make them pivot around the rotation axis (37A). Each finger (35) has a locking element (67), to rigidly lock the finger to the beam (9).

A doctor blade holder (7) for a doctor blade (43) adapted to coact with a cylindrical surface (1S) of a rotating cylinder (1). A plurality of fingers (35) are mounted on a beam (9), hinged around a rotation axis (37A) and configured to cumulatively form a housing seat (41) for the doctor blade (43). The fingers (35) are pivotable independently from one another around the rotation axis (37A). At least one elastic thrust member (51) is configured and arranged to generate a thrust on the fingers (35) to make them pivot around the rotation axis (37A). Each finger (35) has a locking element (67), to rigidly lock the finger to the beam (9).

The invention embodies the application of different combinations of the monitoring and data processing aspects as a means to develop an early warning chatter alarming system. Configuring an early warning chatter alarming system can be as simple as using n alarm settings to develop an alarming strategy from different trend conditions such as overall RMS, selected vibration frequencies, slope analysis, and wavelet analysis. A higher level of alarming is provided by using a time integrated approach to account for both intensity of the alarm variable and duration. Combining these different aspects with a predictive model incorporates process-operating conditions to enhance the alarming sensitivity for earlier detection and reduce false positives. Finally, combining the different alarming aspects with a rule-based decision making approach such as fuzzy logic allows alarming based on qualitative analysis of different data streams.

The invention embodies the application of different combinations of the monitoring and data processing aspects as a means to develop an early warning chatter alarming system. Configuring an early warning chatter alarming system can be as simple as using n alarm settings to develop an alarming strategy from different trend conditions such as overall RMS, selected vibration frequencies, slope analysis, and wavelet analysis. A higher level of alarming is provided by using a time integrated approach to account for both intensity of the alarm variable and duration. Combining these different aspects with a predictive model incorporates process-operating conditions to enhance the alarming sensitivity for earlier detection and reduce false positives. Finally, combining the different alarming aspects with a rule-based decision making approach such as fuzzy logic allows alarming based on qualitative analysis of different data streams.