MXPA97006274A - Dynamic grip system detector of pres - Google Patents

Abstract

The present invention relates to a system for determining the pressure profile in a press grip comprising: a first roll configured to form a press grip with at least one other roll, said first roll has a roll longitudinal axis and comprises a plurality of detectors disposed in the same axial location along and circumferentially around said roller to detect the loading pressure exhibited on said first roller while said first roller is pressing rotatably against the other roller, said detectors provide pressure signals representative of the pressure detected by each of said detectors, a computer comprising a microprocessor for measurements of the computation of the pressure detected by at least one of said detectors of said pressure signals, and a screen coupled with said computer to provide a visual representation of said pressure measurements

Description

DYNAMIC DRAINING SYSTEM PRESSURE DETECTOR FIELD OF THE INVENTION This invention refers to a roller for use in the press grip section of a papermaking machine or if it is similar, it says that it has reliable detectors for the temperature. the rodi l lo.

BACKGROUND OF THE INVENTION In the papermaking process, many steps are required to transform the paper paste into paper. The initial stage is the deposit of the paste in the entrance box on fabric or fabric of the paper machine. As it is deposited, the white water that is part of it (the paste flows to tr-birds from the interstices of the fabric, leaving on it a mixture of water and fiber.) Afterwards, the cloth holds the material by leaving it through several stages of dewatering so that only one band or fibrous mat remains on the surface One of the steps of dewatering to place- in the press grip section of the papermaking process. Two or more matching rollers press the fibrous web when moving on the fabric between the rollers.

On the fabric, they cause the band to move over it to flatten, achieving a wet fibrous mat. The humid mat is then conducted through several stages of vacuum and dewatering. It is important the amount of pressure applied to the mat during the grip pressing stage to achieve characteristics for the sheet. Variations in grip pressure can affect the moisture content of the blade and the properties of the blade. Excessive pressure may cause fracture of the fibers as well as holes in the resulting paper product. Conventional methods to solve this problem have not been successful, and as this problem in the grip pressing stage often results in quality paper having uneven surface characteristics., L roller deflection commonly due A buckling load or grip, has been a source of unequal pressure distribution. To compensate for this deflection, rollers have been developed that monitor and alter the roll camber. Usually, said rollers have a float shell surrounding a stationary core. Below the float shell there are pressure regulators that detect pressure differences and provide increased pressure to the float shell when necessary. One such roller is described in U.S. Patent No., 509, 237. This roller has detectors of position to determine an uneven arrangement of the roller shell. The sera of the detectors act on the support or pressure elements below the roller shell, thereby equalizing any uneven location that may exist due to pressure variations. The pressure elements comprise conventional hydrostatic support bearings which are provided by a pressurized oil supply line. A similar roller is described in U.S. Patent No. 4,729,153. This controlled deflection roller also has a detector to regulate the temperature of the roller surface in a narrow band across the face of the roller. Other controlled deflection rolls such as that described in US Patent No. 4, 233, 011 function on the basis of the thermal expansion properties of the roll material to achieve proper bending of the roll. These compensated deflection rollers are effective, "in the variation of the sag.This way, said rollers can operate as effectively at a load of 7 kg / cm2 as one of 35 kg / cm2, while the rollers without said Only the prior art has handled the problem of measuring roller deflection, the prior art does not mention the methods of measuring the load across the face of the roller while the roller is in operation, the load is the force applied by the roller in a press grip to a band fibrous. As indicated above, frequently the amount of pressure is applied unevenly. For example, if the roller load is set at 14 kg / cm2, it can actually be 21 kg / cm2 at the ends and 7 kg / cm2 at the center. Conventional methods to determine the presence of these discrepancies in the applied pressure require stopping the roller and placing a large piece of carbon paper, thin foil or pressure sensitive film in the grip. This procedure is known as a grip impression. Although this method is useful, it can not be used when grip pressing is in operation. In addition, these methods are not reusable since they measure only a single event, such as the highest pressure or the width of the contact. Additionally, said readings must be obtained repeatedly and averaged to be useful, a procedure that causes an increase of time outside. for unloading and reloading paper. Finally, the temperature and other related changes that could affect the uniformity of the grip pressure can not be taken into consideration. The roller described in U.S. Pat.

No.4, 098, 012 has attempted to handle this problem by incorporating detectors on the roll to determine the gauge profile of a press grip. However, there are several inherent problems with this roller. The construction of this roller requires a stationary central beam, and as such, it may not adapt to all types of rollers but only to the rollers that have a roller cora, such as the controlled deflection rollers. Therefore, the approach could not be implemented on existing rolls of uncontrolled deflection. The technique would require a significant calibration since the measurements are based on the deflection of the inner diameter of the float shell and not the actual grip load. Roller systems conventional in the art (interior has failed to provide measurements of pressure variations throughout the length while the roller is rotating in a press grip.) The present invention identifies such variations and provides the operator with instant knowledge of said pressure variations, thereby allowing the operator to diagnose irregularities in the pressure applied to the band and initiate corrective measures without delay.

BRIEF DESCRIPTION OF THE INVENTION An object of the present invention is to ensure uniform quality and characteristics of the sheet over the entire width of the machine. Another object of the invention is to measure the pressure in different locations along the roller. Another object of the invention is to expose the dynamic pressure profile of the rodil or. Another object of the invention is to determine the pressure in any given location on the roller. The object of the invention is to translate the measured pressure values into sag correction data. Another object of the invention is to initiate corrective measures to provide uniformity on the loading pressure. Another object of the invention is to provide a method for determining the pressure profile along the roll. These and other objects of the invention are achieved by a system for measuring the dynamic distribution of pressure between the rollers in a grip roller press.

The system comprises a roller adapted to rotationally contact at least one other roller in at least one press grip, which has one or more detectors on it, to measure the grip pressure in different locations as required. Along the length of the roller, the measurements obtained by the detector are transmitted to a computer and a screen to provide numerical representations as well as graphs of the pressure in one or localizations on the roller. Optionally, a control system can be incorporated into the system to determine the pressure distribution along the roller or initiate corrective measures. The system of the present invention can also measure temperature variations, if desired, since thermal sensors can be used on the sensing roller, or the computed-correlation scheme can relate the detector readings to the temperature as well as the pressure. However, the following discussion will focus primarily on the ability of the system to measure pressure variations along the roll. FIG. 1 shows a plan view of the system of the present invention. FIG. 2A shows a preferred embodiment of the roller of the present invention having detectors in locations evenly spaced along the roller. Figure 2B shows an alternate embodiment of the roller of the present invention having a detector in separate locations in the middle and at the ends of the roller. Figure 2C shows an alternative embodiment of the roller of the present invention having two rows of detectors arranged in the same axial location, but at a different circular location on the roller. Figure 2T) shows a side view of an embodiment of the roller of the present invention, having multiple detectors arranged in the same axial location, but in different circumferential locations on the roller, used in the formation of more than a press grip. Figure 2E shows an alternative embodiment of the roller of the present invention having detectors at spaced and axial circumferential locations. Figure 3A shows detectors mounted on the roller surface. Figure 3B shows detectors mounted below a roller cover. Figure 4A shows one embodiment of the roller of the present invention employing fiber optic detectors. Figure 4B shows an alternative embodiment of the roller of the present invention employing optical fiber detectors. Figure 50 shows a graphical representation of the pressure detected along the roller of Figures 2A,? C and 2E, in terms of the location on the roller against the detected pressure. Figure 5B shows a graphical representation of the pressure detected along the roller of Figure 2B in terms of the local lzation on the roller against the detected pressure. Figure BA shows a graphical representation of the pressure detected at each position along the roller of Figures? A and 2B in terms of the angular position of the detector. Figure 6B shows a graphical representation of the pressure detected along the roller of Figure 2C in terms of the angular position of the detector. Figure 6C shows a graphical representation of the pressure detected along the roller of Figure 2D in terms of the position of the detectors.

Figure 6D shows a graphical representation of the pressure detected along the roller of Figure? E in terms of the position of the detectors.

DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows a plan view of the system 1 of the present invention. The roller 2, which has pressure detectors 4 thereon, rests in a press grip confiuration with another roller B. The cloth 8 carrying a band 10 of fibrous material rests between the two rollers,? and 5, causing the band to compress themselves between them. In electrical communication with the detectors 4, electronic elements 24 are associated, which help convert the output of the detector to a pressure value. There is access to a multiplier mounted on the roller 12 by means of the computer 18, to recirculate through the sensors 4 to obtain output signals indicative of the detected pressure. The multiplier-12 is also in electrical communication with a bidirectional transmitter 14 which may comprise a telemetric transmitter, slip rings or a rotary transformer. The transmitter 14 transmits the signals from the multiplier 12 to a signal conditioner 15 which in turn releases conditioned signals representing the detected pressure towards the computer 18. A preferred transmitter-telemetry is manufactured by Microstrain of Burlington, Verrnont. This telemetric transmitter has a single bridge of transmitted FM channel that can be turned on and off by remote control, to conserve energy. This characteristic is important for rollers without rope control, where it is not convenient to detect pressure distributions at all times. An alternative transmitter is manufactured by Physical Measurement Devices of Melbourne, Florida. The POM-15 model incorporates 15 channels on a radio link. The computer 18 has a microprocessor for access to the multiplied channel that originates at predetermined or requested times. The transmissions requested are achieved through the operator input through the computer keyboard. There are many ways to establish which channel is sent, for example, a two-way telemetric system or a two-way collector ring could roll the multiplier. Alternately, an activator may be used to initiate multiplication at a redetermined delay speed established by computer 18. Another alternative is to have the multiplier sent to a hopped channel or signal to denote the current state. Alternatively, a multiplier channel could have a digital print, such as an earth or open signal. A repetitive sequence may also be used so that the starting point can be easily detected, for example a signal burst. If fiber optic detectors are used, such as a Bragg grid, Fabry-Perot intrinsic detectors, Fabry-Perot extrinsic detectors, or online fiber optic detectors, the light output signals can be multiplied on the same optical fiber. The resulting output would encompass several discrete phase deviations, at different frequencies equivalent to the number of detectors. Once the computer 18 has received the signals from the detectors and has calculated a pressure value, the screen 20 can indicate the pressure numerically, graphically or in any other convenient manner depending on the needs of the operator. Transverse pressure profiles of the machine can be displayed, as well as through the gripper profiles. The computer 18 can also convert the pressure measurements into grip widths as well as data for sag correction. Can a system be connected ?? of optional control to the computer 18 and to the signal conditioner 16. The control system 22 serves to correct any i detected pressure regularities, increasing or decreasing the force applied by means of the roller. The control system 22 has an internal icr-oprocessor 26 to receive user inputs in response to the sensed pressure interpretation, or to receive direct pressure readings from the signal conditioner. The microprocessor 26 insofar as it receives said signals, initiates corrective measures to make adjustments to the stump forces applied between the rollers 2 and 6 or to the zone pressures or rope fixations when the system is used as part of a contoured sag realignment system. Figure 2 shows a preferred embodiment of the roller 2 of the present invention having detectors 4 at evenly spaced locations along the roller 2. Note that the detectors 4 are separated uniformly across the roller. This separation is in accordance with the usual practice for sag correction measurements. Although the detectors 4 are linearly shown through the roller 2, this is not essential, since the detectors could disperse non-uniformly or appear in a spiral formation around the roller. Note that the invention is not limited to the detector configurations discussed herein, since the placement of the detectors on the L lio rod may also appear in other configurations. In addition, the detector-s can be arranged as shown in Figure 2B. Said configuration is convenient if the operator wishes to emphasize the detection of pressure in certain regions of the roller. For example, frequently the force exhibited by the roller is greater at the ends of the roller than in the inner part of the roller. In light of this tendency, the detectors can advantageously be arranged in clusters in the middle part 7 of the roller 2 as well as at the ends 9 of the roller 2, as shown in Figure 2B. Additionally, the detectors can be separated in the same axial location along the roller, but at a different circumferential location on the roller, as shown in Figure 2C. By using the roller of this configuration in the system of the present invention, only one of the detectors arranged circumferentially will be in the grip at a given time. Since many detectors are sensitive to effects, measurements often reflect changes in temperature and other effects. This problem is solved if two detectors arranged circumferentially in different locations are used, as shown in Fig. 2C; the outputs of the detectors may be configured in a bridge circuit so that external conditions can be subtracted from it, since the detectors measure the effect of the grip pressure in and out of the grip. The subtraction could also be done digitally. In addition, in a single-detector system, the signal from the detector outside the grip can be subtracted from the signal inside the grip. The detector settings could also work for multiple grip conditions. Each detector passes through each grip during each rotation, as shown in Figure 2B. Multiple detectors can also be used in multiple grip configurations. The detectors can be positioned so that only one grip pressure is read at a time. If multiple simultaneous readings are desired, the detectors can be placed at angles corresponding to the angles of the different grips. The calibrators of l? compensation can also be compensated. In a similar manner, as shown in FIG. 1, the detectors 4 may be arranged spaced apart by 30 ° on the roller. Said roller 2, having detectors 4 arranged in this manner, is useful when the roller 2 ost is configured with other rollers 6, 16 to form two pressing grips, since multiple pressure readings can be obtained simultaneously at different angular locations. This is also discussed with respect to Figure 60. Figure 2E represents an alternate embodiment of the roller 2 of the present invention, having detectors 4 at scattered circumferential and axial locations. the detectors may be electrically connected by means of the connector 25 and spatially configured so that only one detector enters a grip at a time. In this way, during a single revolution, the grip pressure at each axial location would be detected individually and there would be no need for a multiplier. Said provision would provide cross-directional load per-files to the machine in addition to gripping profiles in the machine direction at each axial location. Multiple groups of scattered and connected detectors can also be used. With respect to the detector configurations-shown in Figures 2A-2B, the mounting of said detectors is shown in Figures 3A and 3B. The detectors 4 can be mounted on the surface of the roller 3 as shown in Figure 3A. In addition, given the fact that the rollers are often multi-layered, the detectors 4 can be embedded within a roller cover 5 as shown in FIG. 3B. Observe that depending on the number of layers, the detectors can be embedded in any radial position between the multiple inner layers of a roller. The detectors 4, in one of the leading figures 2A, 2B, 20, can be piezoelectric, piezoresi sti, strain gauges or optical fiber detectors, to mention a few. Further specific detector configurations for native fibers are discussed below with respect to Figures 4A and 4B. With r-spectro to the detector-is described above, the electronic elements 24 on the roller 2, to help convert the output of the detector to a pressure value, depend on the type of detector used. In this way, if piezoelectric or piezoresistive detectors are used, the electronic elements 24 would comprise charge coupled amplifiers. If strain gauge detector is used, the electronic elements 24 would comprise Uheatstone bridges. If fiber optic detectors are used, the electronic elements 24 could comprise an optical phase modulator. In the case of piezoelectric or piezoresistive detectors, these detectors are preferably constructed of thin films and placed on or in the roller. so that the radial pressure is measured. Frequently, the temperature limitations of said detectors prevent the recessed application of Figure 2C. Alternatively, detectors comprising strain gauges can be used to detect pressure along the roll. When strain detectors are used, an indirect measurement of radial pressure is obtained, which is interpreted in computer 18. Alternatively, fiber optic detectors may be used, since such detectors are useful for measuring deformation in any direction. With respect to the measurement of tangential deformation, Bragg grating, Fabry-Perot intrinsic detectors, Fabry-Perot extrinsic detectors and in-line etalon fiber detectors can be used. This *: detectors are able to solve temperature effects, are absolute and are not sensitive to advance. In addition, these detectors can be hermetically sealed to withstand degradation by moisture, thus prolonging the life of the detector. Additionally, these detectors are usually small in size, and as such do not appreciably change the deformation field, since small size prevents the creation of large damage initiation sites. In FIGS. 4A and 4B other detector configurations are shown, the detectors in said figures particularly employ optical fibers. Although fiber optic detectors could be arranged in different orientations (that is, spirals, waves, scattered, straight lines, etc.), the preferred embodiment of Figure 4A shows an optical fiber mounted along the entire length of the roller, parallel to the roller axis. This configuration allows the measurement of the axial deformation of the fiber in response to the pressure. The light waves that travel through the optical fiber undergo deflection and reflection, which can provide an indication of pressure in the computer 18 through the use of refiect ornet ría t íernpo-dominio. Figure 4B shows another fiber optic uration on the roller. In this figure, the optical fiber cable 4 is wound around the roller, with rubber covers 5 wound in alignment therewith. Figure 4C is a view in greater detail of the configuration of Figure 4B and shows a region of the optical fiber gauge aligned with the winding angle for the rubber covers 5. The angular deformation can be measured with this confi ruration , in opposition to the radial pressure, with the deformation readings confi rmed later in the computer 18 it is necessary to determine the pressure variations transverse to the machine. Figure 4D shows an alternative mounting of optical sensors. The detectors 4 can be mounted on suction rollers 29 at positions removed from the openings 28 in the cover 5, and the optical fibers 4 having measurement regions 27 can be directed between the holes. Figure 5A shows a graphical representation of the pressure detected along the roll in terms of the location on the roller, established on the x-axis "against pressure and / or temperature detected, established on the Y axis. This graph represents an output obtained from the roller of figures 2A, 20 and 2E, while the pressure is detected uniformly along the entire roller, Similarly, Figure 5B represents the pressure detected along the length of the roller, however, this graph represents an output obtained from the roller of Figure 2B, as measured in FIG. that the pressure is detected in the middle part at the ends of the roller Figure 6A shows a graphical representation of the pressure detected along the length of the roller in terms of the position of the detector with respect to the configuration of the roller of the figures 2A and 2B Note that to the extent that the detectors are each linearly positioned along the roller, readings are obtained at an angular position of the roll rotation, shown n osta figure at 90. Figure 6B shows a graphical representation of the pressure detected along the same location? z <The axial ion of the roller, but at a different circumferential location on the roller, as shown in the roller of FIG. 2C. In this way, pressure readings are obtained at 90 ° and 270 °. With respect to Figure 6C, when the roller 2 of Figure 2D, which is the roller configured with two detectors separated by angular 30 °, is configured with other rollers 6, 16, to form two press grips, they can Multiple grip pressure readings are obtained during one revolution of the instrumented roller. Of course, different separation angles can be used, including angles that allow both grips to be detected simultaneously. In this manner, a pressure reading of the press grip 1 as well as a pressure reading of the press grip 2 are displayed at different angular locations so that the operator can either grip or both grips at the same time. With respect to Figure 6D, when the roller of Figure 2E, which is the roller configured with a connected group of scattered detectors, is configured with another roller to form a press grip, multiple pressure readings are obtained during a revolution. In this way, a pressure reading results as shown in Figure 6D. The spatial location of the scattered detectors would be known by the software of the computer and would result in pressure profiles transverse to the machine such as that shown in Figure 5A. Returning again to Figure 1, the general operation of the invention is as follows. The rollers 2 and 6, arranged in a press grip confiuration, rotatably compress the web 10 of fibrous material therebetween. At a predetermined time or at a time sliced by an operator, the computer 18 communicates with the bidi transmitter 14, which communicates with the multiplier 12. Then, the multiplier 12 is recirculated through the detector-is 4, obeyed signals through the associated electronic elements 24; these signals are indicative of the pressure detected by the detectors 4. Multiplicator 12 then communicates with the transmitter-14 to send the signals to the signal conditioner 16 to release back to the computer 18 where the determination takes place. of the pressure values. Then, computer 18 originates a numerical or graphic output to appear on screen 20, alerting the operator of the pressure distribution in the dynamic grip press. Optionally, the computer 18 and / or the transmitter 14 can communicate signals related to the pressure to the control system 22. Then, in response to these signals, the control system 22 can initiate the sag correction to remedy any irregularities in the control system. the pressure detected. The system of the present invention provides the operator with the ability to determine the pressure profile of a roller in one or more grips in order to diagnose the presence of unevenly applied roller forces. The different graphic representations allow the operator to immediately stop the applied pressure, the location on the roller, and whether or not it is abnormal. In addition, the system of the present invention provides corrective measures to be initiated in response to said unequally applied forces. Although the invention has been described and described parculularly with reference to the modalities mentioned above, the experts in the field will understand that different changes can be made in form and tJetalle to the same without departing from the spirit and scope of the invention. In this way, any modification of the shape, confi ruration and composition of the elements comprising the invention is within the scope of the present invention. It is also to be understood that the present invention is not by any means limited to the pariular constructions or procedures described and / or shown in the drawings herein, but also comprises any modification or equivalent within the scope of the reivifications. ,.

Claims (9)

") NOVELTY OF THE INVENTION CLAIMS

1. - A system for determining the pressure profile in a press grip comprising: a first roll configured to form a press grip with at least one other roll, said first roll has a roll longitudinal axis and comprises a plurality of detectors arranged on the axial localization along and circumferentially around said roller to detect the loading pressure exhibited on said first roller while said roller is pressing rotationally against the other roller, said sensors are providing pressure signals. representative of the pressure detected by each of said detectors; a computer comprising a microprocessor for measurements of the pressure detected by means of monkeys one of said detectors of said pressure signals; and a screen, coupled with said computer to provide a visual representation of said pressure measurements.

2. The system for determining the pressure profile in a press grip according to claim 1, characterized in that said detector-es are piezo detectors 1 ect ri eos.

3. The system for determining the pressure profile in a press grip according to claim 1, Characterized also because these detectors are piezoresi tívos detectors. 4 - The system for determining the pressure profile in a press grip in accordance with claim 1, further characterized in that said detectors are detectors for deforming operation. 5. The system for determining the pressure profile in a press grip according to claim 1, characterized by the fact that said detectors are residual detectors. 6. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that it comprises a control system in communication with said detectors, said control system is adapted to initiate mail of pressure in said first roller. 7. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that it comprises a multiplier to provide said pressure signals to said computer. 8. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that it comprises a transmitter for providing said pressure signals to said computer. 9. The system to determine the pressure profile in a press grip according to claim 8, further characterized in that said transmitter is a wireless transmitter-inal. 10. The system to determine the pressure profile in a grip "Je press according to claim 0, further characterized in that said transmitter includes slip rings. 11. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that said system comprises a signal conditioner for providing said pressure signals to said computer. 12. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that said screen provides a tabular display of the detected pressure. 13.- The system for determining the pressure profile on a press grip according to claim 1, further characterized because said screen provides a numerical display of the detected pressure, 14.- The system to determine the pressure profile in a press grip according to claim 1, further characterized in that said screen provides a graphic display of the detected pressure. 15. The system for determining the pressure profile in a press grip according to claim 1, further characterized in that said computer comprises a user input to request pressure measurements. 16.- The terminal to determine e1 | > A press grip in accordance with claim 1, further characterized in that said computer comprises an input for pressure measurements automatically requested at predetermined times. 17. The system to determine the pressure profile in a press grip according to claim 1, characterized by the fact that at least one of said detectors is embedded under an external surface of said first roller. . 18. A system for determining the temperature profile in a press grip comprising: a prpner r-odi 1 configured to form a press grip with at least one other roller, said first roller has a longitudinal axis of roller and comprises a plurality of temperature detectors disposed in the same axial location along and circumferentially around said roller to detect the temperature exhibited on said first roller while said first roller is rotatingly pressing against the other roller, said temperature detectors provide temperature signals representative of the temperature detected by each of said temperature detectors; a computer comprising a microprocessor for measurements of the temperature detected by means of at least one of said temperature detectors temperature signs; a screen, coupled with said computer to provide a visual representation of said temperature measurements. 19. A method for determining the pressure profile in a press grip comprising: providing a first roller configured to form a press grip with at least one or both rollers, said first roller having a longitudinal axis of a roller that it has a plurality of pressure detectors disposed in the same axial location along and circumferentially around said roller; using said pressure detectors to detect the pressure exhibited against said first roller while the first roller and the other mentioned roller are rotatingly pressing material therebetween; transmit signals from said pressure detectors representing the detected pressure, to a computer-a, and display visual representations of the detected pressure. 20. A method for determining the pressure profile in a press grip according to claim 19, further characterized in that it comprises exhibiting the linear locations along said first roller where the pressure is detected. 21. A method for determining the pressure profile in a press grip according to claim 19, further characterized in that it comprises exhibiting the angular locations along said first roller wherein detects the pressure. 22. A system for determining the pressure profile in a press grip comprising: a first roller configured to form a press grip with at least one other roller, said first roller comprises a plurality of detectors arranged around said roller at unequal radial, axial and circumferential positions to detect the loading pressure exhibited on said first roller when said first roller is rotatingly pressing against at least one other roller, said detectors provide pressure signals representative of the pressure detected by each of them. said detector-is; a computer comprising a microprocessor for measurements of the pressure detected by means of at least one of said detectors of said pressure signals; and a screen, coupled to said computer, to provide a visual representation of said pressure measurements. 23. A system for determining the pressure profile in a press grip comprising: a first roller configured to form a press grip with at least one other roller, said first roller comprises a plurality of fiber optic detectors for detecting the loading pressure exhibited on said first roller when said first roller is pressing rotatably against the other roller, said sensors provide pressure signals representative of the pressure detected by each of said detectors; a computer comprising a microprocessor for measurements of the pressure detected by means of at least one of said detectors of said pressure signals; and a screen, coupled with said computer, to provide a visual representation of said pressure measurements. 2

4. The system for determining the pressure profile in a press grip according to claim 23, further characterized in that said fiber optic detector comprises an optical fiber mounted along said first roller, and parallel to the axis of said roller. 2

5. The system for determining the pressure profile in a press grip according to claim 23, further characterized in that said fiber optic detector comprises an optical fiber wound around said roller. 2

6. The subject to determine the pressure profile in a press grip according to claim 23, further characterized in that said first roller is a suction roller. 2

7. A system for determining the temperature profile in a press grip comprising: a first roller configured to form a press grip with at least one other roller, said first roller comprises a plurality of temperature sensors arranged around said roller in unequal radial, axial and cunferential positions to detect the temperature displayed on said first roller when this first roller is pressing rotatably against the other roller, said temperature sensors provide temperature signals representative of the temperature detected by each of the temperature detectors, a computer-comprising, a rn croprocessor for measurements of the temperature detected by means of at least one of said temperature detectors of said temperature signals, a screen, coupled with said computer, to provide a visual representation of said temperature measurements.