Multiple groups of sensors are circumferentially spaced apart at each cross-directional position along a sensing roll of a nip press to measure and cancel or nearly cancel the effects of rotational variability which may be acting on the sensing roll. The strategically-placed sensors are designed to measure the pressure being placed against the web that is being advanced through the nip press. The average of the measurements of multiple sensors spaced circumferential apart provides a good cancellation of any rotational variability that might be found at a cross-directional position on the sensing roll. In this manner, a more true measurement of the nip pressure profile can be obtained and better adjustments made to reduce nip pressure profile variability. In addition, the nip variability profile may be used as a predictor of cover or bearing failures, resonant frequencies and other roll anomalies.

The invention relates to a method and system for improving the application of a coating on a Yankee cylinder (CR) in tissue paper machines. The invention implements a moisture-controlled environment (12) in an area of the exposed Yankee cylinder between the take-off position (TO) and ahead of the transfer position (TP) of the web, i.e. before and/or after the application of a coating with Performance Enhancing Material (PEM), wherein the cooling effect on the Yankee surface is increased by increased evaporation rate of water in the coating or water additionally applied onto the coating.

A visual inspection system is integrated within a pulp molding process to identify holes, tears, and discoloration of molded products based upon front- and/or back-lit images captured by one or more cameras that have been calibrated to distinguish, on a pixel-by-pixel basis, the aforementioned defects. The system is configured to simultaneously move and process information about the entire batch of products produced by the press and, optionally, to provide feedback to the original molding process in order to address quality issues.

An arrangement and method for monitoring a Yankee cylinder (3). The arrangement comprises a Yankee cylinder (3) arranged in a tissue machine (1) for manufacturing a tissue web (2), a measuring device (10) being a permanent part of the tissue machine (1) and providing a main measuring device for a process control of the tissue machine (1), and at least one data processing unit (15) configured to process measurement data describing the at least one measured property of the moving web (2). The data processing unit (15) is configured to form at least one graphical representation describing a treatment effect performance provided by a heated outer surface (4) of the Yankee cylinder (3) to the web (2) to be manufactured.

Processes of determining features of a paper-making fabric. The processes utilize a representation of a portion of a surface of the fabric, with the representation showing at least one of (i) locations and (ii) sizes of knuckles and pockets in the surface of the fabric. An image of the portion of the fabric is generated based on the representation. Using the displayed image, an outline is drawn around at least one of the knuckles, and guidelines are drawn such that the guidelines at least one of (i) pass through the center of the outlined knuckle, (ii) pass through the other knuckles, and (iii) form a shape that surrounds areas of the image that correspond to where the pockets are formed between the knuckles. With the outlined knuckle and guidelines, properties that affect the paper-making functionality of the fabric may be calculated.

The invention relates to a support plate of a doctor in a fiber web machine. The support plate (10) is designed to be removably fitted to a blade holder (16) and to support a doctor (15) in the blade holder (16). The support plate (10) includes sensor devices (18) for detecting that a drop through has accrued either upstream from the doctor or at the doctor. The invention also relates to a doctor assembly of a fiber web machine and a method in a doctor of a fiber web machine.

A system for forming a print of a surface of a fabric. The system includes a first plate, a second plate, a pressure measurement film, and a fabric that can be used in a papermaking process. The fabric includes a plurality of knuckles on at least one of its surfaces. A print of the knuckles of the fabric is formed on the pressure measurement film by pressing the fabric against the pressure measurement film between the first plate and the second plate.

A process of forming a papermaking fabric includes determining a value of a characteristic of a first papermaking fabric related to one of (i) knuckles in the first papermaking fabric, (ii) pockets in the first papermaking fabric, and (iii) both knuckles and pockets formed in the first papermaking fabric. A first paper product having domes is formed using the first papermaking fabric. A property of the domes is determined in the first paper product and correlated to the determined value of the characteristic of the first papermaking fabric. A second papermaking fabric is formed such that a value of the characteristic in the second papermaking fabric is altered from the determined value of the characteristic in the first papermaking fabric. A second paper product having domes is formed. The property of the domes in the second paper product is different than the determined property of the domes in the first.

A method for creping paper includes applying an adhesive composition to an outer surface of a creping cylinder (Yankee cylinder) to form an adhesive coating, contacting paper with the adhesive coating, removing the paper and adhesive coating from the creping cylinder, and determining a quality of the adhesive coating. Determining the quality of the adhesive coating may include measuring a degree of cross-linking of the adhesive polymer, a concentration of the adhesive polymer in the adhesive coating, a water content of the adhesive coating, an ash content of the adhesive coating, or combinations thereof. Determining the quality of the adhesive coating may also include determining a thickness of the adhesive coating by measuring light absorbed by the coating and calculating the thickness using Beer's Law. Systems and apparatuses for determining the quality of the adhesive coating and for creping paper are also disclosed.

A process of determining features of a fabric. A representation of a portion of a surface of the fabric is formed showing at least one of (i) locations and (ii) sizes of knuckles and pockets in the surface of the fabric. An image is generated of the portion of the surface of the fabric based on the representation. A portion of the image is displayed on a computer screen. An outline is drawn around at least one of the knuckles in the image. Guidelines are drawn such that the guidelines (i) pass through the center of the at least one outlined knuckle, (ii) pass through the other knuckles, or (iii) form shapes that surround areas of the image that correspond to where the pockets are formed between the knuckles. The outline and the guidelines are drawn using an image analysis program.