CA2241889A1 - Device and method for measuring the surface hardness of rolls of paper or other material strips - Google Patents
Device and method for measuring the surface hardness of rolls of paper or other material strips Download PDFInfo
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- CA2241889A1 CA2241889A1 CA002241889A CA2241889A CA2241889A1 CA 2241889 A1 CA2241889 A1 CA 2241889A1 CA 002241889 A CA002241889 A CA 002241889A CA 2241889 A CA2241889 A CA 2241889A CA 2241889 A1 CA2241889 A1 CA 2241889A1
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- roll
- hardness
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- measuring head
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/34—Paper
- G01N33/346—Paper sheets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Treatment Of Fiber Materials (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Sanitary Thin Papers (AREA)
- Paper (AREA)
Abstract
The invention relates to a device for measuring the surface hardness of rolls (2) of paper or other material. Said device comprises at least one hardness measuring head (12) with at least one rotatably mounted contact roll to rest, under radial pressure, on the revolving roll (2) of paper or the like. The hardness measuring head (12) can be moved on a rail (11) substantially parallel to the winding axis of the roll (2) or the like and has means for evaluating the measuring signals of the hardness measuring head (12). It is proposed to provide first and second means to monitor and, optionally, influence parameters of a material strip wound to form the roll, such as roll hardness, strip tension, uniformity of roll diameter along the roll width and the like, during winding. Said means can be used to hold at least one of the contact rolls (126, 127; 126', 126'', 127'') in position on the roll (2) with a first force and to cause at least one of the contact rolls (126, 127; 127', 127'') to penetrate with a second force deeper into the surface than with the first force.
Description
The invention pertains to a device and a method for measuring the surface hardness of wound rolls of paper or similar material webs with at least one hardness measuring head having at least one contact roll seated so as to rotate for contact under radial pressure with the rotating roll of paper or the like, in which the hardness measuring head can be displaced along a beam essentially parallel to the winding axis of the roll or the like and is equipped with means for evaluating the measurement signals of the hardness measuring head.
- In manufacturing paper, cardboard, films or other web-like materials, differences (proflles) result from the cross and the machine directions in, among other things, thickness, density and basis weight. For manufacturing reasons, the profiles in the cross direction generally tend to be uniform, that is, the thick or thin points in the cross direction remaln mostly at the same spot.
When winding these webs manufactured in such a manner into rolls, differences of diameter result at the thicker places in contrast to the thinner places. As a rule, the larger a roll is wound, the greater this difference in diameter.
The winding of a roll is generally done in contact with one or more support or backing rolls. Thereby there is a greater contact force (line pressure, nip force, nip load) at the thicker points than at points with lesser thickness.
That is to say, the layers are pressed more or less strongly together corresponding to the profile. This pressure can be measured as the hardness on the generated surface of the roll.
It is customary to measure this hardness in the stationary state, i.e., for a finished wound roll. This is typically done by manually measuring-the recoil hardness at set intervals perpendicular to the web running directlon on the generated surface (so-called Schmltthammer measurement~.
Permitting these measurements during winding or unwinding, and thus displaying a transverse hardness profile contlnuously or in determined, freely selectable time, diameter, or run-length intervals, is known from DE 20 54 505 B2. For this purpose, a single contact roll with piezoelectric measuring transducers of two different sizes worked into the roll surface is used.
- In order to be able to monitor parameters of a material web wound into a roll, such as roll hardness, web tension, uniformity of the roll diameter along the roll width and the like more precisely during the winding process and optionally to be able to influence them, it is proposed to provide a first and second means, with which at least one of the contact rolls can be held against the roll with a first force and with which at least one of the contact rolls can be pressed deeper into the surface with a second force than with the first force. With a device according to the invention, the surface hardness of wound rolls of paper or the like can be measured in that the difference of the indentation depth or the recoil of at least one contact roll held on the winding surface of the rotating roll of paper or the like with a roughly radial pressure component is measured continuously or intermittently along the winding axis of the roll.
In this way a measurement of the surface hardness profile across the web during the winding process is possible in a simple manner. In the process, a variety of data is obtained which can be used for the optimization of the production or treatment process in order to increase the quality or quantity of the end product.
One possible utilization of the measurement data consists in adjusting the longitudinal cutting devices on a roll-slitting machine (slitter) as a function of the measured hardness profile such that the wound cut webs each obtain a more homogeneous hardness profile and/or the risk of web tears is reduced. The winding rate can thus be increased.
The measuring heads can be configured in various ways.
In a first and second embodiment, the hardness measuring head consists of at least two contact rolls side by side, arranged spaced apart preferably in their axial direction, which can be pressed with different forces against the roll to be measured, and a means for measuring the difference in indentation depth of the contact rolls. According to a third embodiment, the hardness measuring head is equipped with at least one impact generator for radically propelling the contact roll against the roll surfac~e and for measuring the recoil of the contact roll.
Details of the aforesaid embodiment result from the embodiments explained in conjunction with the drawing.
The above-specified method steps and components according to the invention, as well as those claimed and those illustrated in the drawings, are not subject to any special exceptional conditions regarding their process conditions, size, physical design, material selection and technical conception, so that the selection criteria known in the respective field of application can be applied without restriction.
Additional details, characteristics and advantages of the object of the invention result from the following description of the associated drawing in which, for the sake of example, preferred embodiments are illustrated. In the drawing, Figure 1 shows a roll winding machine (schematically) in a side view with a hardness measuring unit (view A according to Figure 2);
Figure 2 shows the same device in a front view (view B
according to Figure 1);
Figure 3A/B shows a first hardness measuring head for the same device in a front view (Figure 3A, corresponding to direction C in Figure 3B) and, Figure 3B, in a side view (corresponding to direction D in Figure 3A)i Figure 4A/B shows a second embodiment of a hardness measuring head in the same mode of representation as in Figure 3A/B; and Figure 5 shows a third embodiment of a hardness measuring head in the mode of representation as in Figures 3B and 4B.
In the winding machine illustrated in Figure 1, a driven backing roll 1 is provided, against which a roll 2 of a paper web or the like is held in contact by a pair of support arms, not illustrated here because they are familiar from the prior art. As is evident from the dashed line representation in Figure 1, the diameter of the roll to be wound 2 is initially very small. It subsequently increases to a defined final dimension tillustrated by a solid line~ and is then removed from the winding position (see the dotted-dashed line representation of roll 2).
A frame 10 consisting of posts and crosspieces supports a beam 11, which extends over the entire machine width (as is evident from Figure 2). The beam 11 is fastened to the frame 10 consisting of a pair of elements and seated such that the beam 11 , arranged roughly parallel to the winding axis lA, can be displaced in several directions with horizontal and vertical directional components oriented orthogonally to the winding axis lA. This is illustrated in Figure 1 by the quadruple representation of the beam 11 and the hardness measuring head 12, still to be explained, in conjunction with the motion lines 13', 13'', 13''' of the beam 11. Even if the beam 11 and the hardness measuring head 12 are shown by solid lines in the four positions (merely for the sake of clarity), this structural unit is still only in one of the positions that can be achieved with respect to the frame 10.
The hardness measuring head is guided on the beam 11 such that the hardness measuring head can be displaced along the entire machine width, i.e., along the entire winding width, so that a hardness profile across the machine direction on the roll surface can be prepared. The hardness measuring head 12 operates preferably according to on of the three modes of operation illustrated in Figures 3A-5.
According to Figures 3A and 3B, a hardness measuring head 12 has a base plate 121 which is provided on its back side (i.e., to the left in Figure 3R), in a manner not illustrated in detail, with guide means for movement along the beam 11. The base plate supports two separated guide elements 122 and 123, which guide sensor plungers 124 and 125 sliding in guidance holes. Each sensor plunger supports a ball-bearing-seated contact roll 126,127 which is held axially parallel and separated from the other contact roll , in contact against the surface of the roll 2 to be measured with respect to its hardness profile. An individual linear drive 128,129 for each sensor plunger, which is connected without tensile or compressive play, that is, in the motive sense, via a yoke 130,131 to the end face of the sensor plungers 124,125 away from the contact rolls 126,127, serves to produce this contact . In addition, two position-measuring devices 132,133, whose axially movable position pick-up plungers 134,135 are rigidly connected via clamps 136,137 to the sensor plungers 124 and 125, respectively, are fastened to the outside of the guide element 123. The mode of operation of this hardness measuring head is such that the two contact rolls 126,127 are advanced with respect to the beam 11 with differing pressures against the roll 2.
One of the two contact rolls 126 and 127, respectively, serves for reference measurement. The contact force between this contact roll and the roll to be measured is small and should be only just large enough to press the paper plies tightly together, that is, without air inclusions and without compressing them elastically or plastically. The position thus achieved is measured by means of the associated position pick-up 132 or 133.
The other of the two contact rolls 126 or 127 is subjected to higher contact force for the actual measurement of the indentation depth. In order to avoid damage to the paper, however, the contact force of this roll should at most exhaust the latter's elasticity.
From the measured positions, a difference value, which is defined and scaled as a function of hardness, is formed by an electronic unit not illustrated here.
Due to the reference measurement, errors, such as nonparallelism between roll 2 and traverse 11, bending of the traverse 11 or conicity of the roll 2, are also eliminated.
In the embodiment of Figures 4A and 4B, only one single sensor plunger 125 is seated so as to be able to slide with low resistance in the guide elements 122 and 123 on the base plate 121. With the single linear drive 129, the sensor plunger 125 is moved via the yoke 131 axially up to the roll of paper 2 or the like which is to be measured and a defined contact force is exerted. In this embodiment, three contact rolls 126', 126'' and 127' for the roll 2 are seated so as to be able to rotate in ball bearings in a roughly axially parallel arrangement. The middle of the three laterally spaced contact rolls can be displaced with respect to the sensor plunger 125 against the force of a helical compression spring 138. In the relaxed state, the running surface of contact roll 127' projects in comparison to the running surface of the contact rolls 126'and 126''. If the sensor plunger 125 is advanced under axial pressure against the roll 2 (perpendicular to the latter as a rule) until the contact rolls 126',126'' lie against the surface of the roll with contact pressure, the spring 138 is compressed in the direction of the yoke 131 to a greater or lesser extent, depending on the difference in surface hardness in the area of the three contact rolls. A force-measuring cell 139 detects the spring force of the spring 138, which corresponds to the surface hardness profile at the measurement point.
In the third embodiment taccording to Figure 5) a base plate 121 supports, via a tube 140 rigidly connected to it, a fork-shaped mount 141 for a contact roll 127'' seated so as to be able to rotate in ball bearings. An oscillation generator 142 drives a ram or hammer 143 inside the tube 140 against an anvil 144. The contact roll 127'' is thereby advanced momentarily towards the surface of the roll 2. Depending on the surface hardness, the contact roll 127'' recoils more or less strongly. The strength of this recoil can be measured, for example, by an accelerometer cell 145 as a function of the surface hardness of the roll 2.
Moreover, as is evident from Figure 1, larger changes of roll diameter, which exceed the stroke length of the hardness measuring heads, can be measured by radial movement of the entire traverse together with the hardness measuring head. Additional traverse movement possibilities of serve the purpose of being able to move the finished roll out of the winding machine.
In all embodiments, it is possible, with the aid of a position measuring unit for detecting the position of the hardness measuring head along the traverse or the roll to be measured, for a possible thickness variation of the roll in the cross direction of the web, such as a conicity of the roll, to be detected and evaluated.
List of reference numerals 1 Backing roll lA Winding axis 2 Paper roll 10 Frame 11 Traverse 12 Hardness measuring head 13' Line of movement 13'' Line of movement 13'''Line of movement 121 Base plate 122 Guide element 123 Guide element 124 Sensor plunger 125 Sensor plunger 126 Contact roll 126' Contact roll 126''Contact roll 127 Contact roll 127' Contact roll 127''Contact roll 128 Linear drive 129 Linear drive 130 Yoke 131 Yoke 132 Position measuring apparatus 140 Tube 133 Position measuring apparatus 141 Mount 134 Position pick-up plunger 142 Oscillation generator 135 Position pick-up plunger 143 Hammer 136 Clamp 144 Anvil 137 Clamp 145 Accelerometer cell 138 Helical compression spring 139 Force measuring cell
- In manufacturing paper, cardboard, films or other web-like materials, differences (proflles) result from the cross and the machine directions in, among other things, thickness, density and basis weight. For manufacturing reasons, the profiles in the cross direction generally tend to be uniform, that is, the thick or thin points in the cross direction remaln mostly at the same spot.
When winding these webs manufactured in such a manner into rolls, differences of diameter result at the thicker places in contrast to the thinner places. As a rule, the larger a roll is wound, the greater this difference in diameter.
The winding of a roll is generally done in contact with one or more support or backing rolls. Thereby there is a greater contact force (line pressure, nip force, nip load) at the thicker points than at points with lesser thickness.
That is to say, the layers are pressed more or less strongly together corresponding to the profile. This pressure can be measured as the hardness on the generated surface of the roll.
It is customary to measure this hardness in the stationary state, i.e., for a finished wound roll. This is typically done by manually measuring-the recoil hardness at set intervals perpendicular to the web running directlon on the generated surface (so-called Schmltthammer measurement~.
Permitting these measurements during winding or unwinding, and thus displaying a transverse hardness profile contlnuously or in determined, freely selectable time, diameter, or run-length intervals, is known from DE 20 54 505 B2. For this purpose, a single contact roll with piezoelectric measuring transducers of two different sizes worked into the roll surface is used.
- In order to be able to monitor parameters of a material web wound into a roll, such as roll hardness, web tension, uniformity of the roll diameter along the roll width and the like more precisely during the winding process and optionally to be able to influence them, it is proposed to provide a first and second means, with which at least one of the contact rolls can be held against the roll with a first force and with which at least one of the contact rolls can be pressed deeper into the surface with a second force than with the first force. With a device according to the invention, the surface hardness of wound rolls of paper or the like can be measured in that the difference of the indentation depth or the recoil of at least one contact roll held on the winding surface of the rotating roll of paper or the like with a roughly radial pressure component is measured continuously or intermittently along the winding axis of the roll.
In this way a measurement of the surface hardness profile across the web during the winding process is possible in a simple manner. In the process, a variety of data is obtained which can be used for the optimization of the production or treatment process in order to increase the quality or quantity of the end product.
One possible utilization of the measurement data consists in adjusting the longitudinal cutting devices on a roll-slitting machine (slitter) as a function of the measured hardness profile such that the wound cut webs each obtain a more homogeneous hardness profile and/or the risk of web tears is reduced. The winding rate can thus be increased.
The measuring heads can be configured in various ways.
In a first and second embodiment, the hardness measuring head consists of at least two contact rolls side by side, arranged spaced apart preferably in their axial direction, which can be pressed with different forces against the roll to be measured, and a means for measuring the difference in indentation depth of the contact rolls. According to a third embodiment, the hardness measuring head is equipped with at least one impact generator for radically propelling the contact roll against the roll surfac~e and for measuring the recoil of the contact roll.
Details of the aforesaid embodiment result from the embodiments explained in conjunction with the drawing.
The above-specified method steps and components according to the invention, as well as those claimed and those illustrated in the drawings, are not subject to any special exceptional conditions regarding their process conditions, size, physical design, material selection and technical conception, so that the selection criteria known in the respective field of application can be applied without restriction.
Additional details, characteristics and advantages of the object of the invention result from the following description of the associated drawing in which, for the sake of example, preferred embodiments are illustrated. In the drawing, Figure 1 shows a roll winding machine (schematically) in a side view with a hardness measuring unit (view A according to Figure 2);
Figure 2 shows the same device in a front view (view B
according to Figure 1);
Figure 3A/B shows a first hardness measuring head for the same device in a front view (Figure 3A, corresponding to direction C in Figure 3B) and, Figure 3B, in a side view (corresponding to direction D in Figure 3A)i Figure 4A/B shows a second embodiment of a hardness measuring head in the same mode of representation as in Figure 3A/B; and Figure 5 shows a third embodiment of a hardness measuring head in the mode of representation as in Figures 3B and 4B.
In the winding machine illustrated in Figure 1, a driven backing roll 1 is provided, against which a roll 2 of a paper web or the like is held in contact by a pair of support arms, not illustrated here because they are familiar from the prior art. As is evident from the dashed line representation in Figure 1, the diameter of the roll to be wound 2 is initially very small. It subsequently increases to a defined final dimension tillustrated by a solid line~ and is then removed from the winding position (see the dotted-dashed line representation of roll 2).
A frame 10 consisting of posts and crosspieces supports a beam 11, which extends over the entire machine width (as is evident from Figure 2). The beam 11 is fastened to the frame 10 consisting of a pair of elements and seated such that the beam 11 , arranged roughly parallel to the winding axis lA, can be displaced in several directions with horizontal and vertical directional components oriented orthogonally to the winding axis lA. This is illustrated in Figure 1 by the quadruple representation of the beam 11 and the hardness measuring head 12, still to be explained, in conjunction with the motion lines 13', 13'', 13''' of the beam 11. Even if the beam 11 and the hardness measuring head 12 are shown by solid lines in the four positions (merely for the sake of clarity), this structural unit is still only in one of the positions that can be achieved with respect to the frame 10.
The hardness measuring head is guided on the beam 11 such that the hardness measuring head can be displaced along the entire machine width, i.e., along the entire winding width, so that a hardness profile across the machine direction on the roll surface can be prepared. The hardness measuring head 12 operates preferably according to on of the three modes of operation illustrated in Figures 3A-5.
According to Figures 3A and 3B, a hardness measuring head 12 has a base plate 121 which is provided on its back side (i.e., to the left in Figure 3R), in a manner not illustrated in detail, with guide means for movement along the beam 11. The base plate supports two separated guide elements 122 and 123, which guide sensor plungers 124 and 125 sliding in guidance holes. Each sensor plunger supports a ball-bearing-seated contact roll 126,127 which is held axially parallel and separated from the other contact roll , in contact against the surface of the roll 2 to be measured with respect to its hardness profile. An individual linear drive 128,129 for each sensor plunger, which is connected without tensile or compressive play, that is, in the motive sense, via a yoke 130,131 to the end face of the sensor plungers 124,125 away from the contact rolls 126,127, serves to produce this contact . In addition, two position-measuring devices 132,133, whose axially movable position pick-up plungers 134,135 are rigidly connected via clamps 136,137 to the sensor plungers 124 and 125, respectively, are fastened to the outside of the guide element 123. The mode of operation of this hardness measuring head is such that the two contact rolls 126,127 are advanced with respect to the beam 11 with differing pressures against the roll 2.
One of the two contact rolls 126 and 127, respectively, serves for reference measurement. The contact force between this contact roll and the roll to be measured is small and should be only just large enough to press the paper plies tightly together, that is, without air inclusions and without compressing them elastically or plastically. The position thus achieved is measured by means of the associated position pick-up 132 or 133.
The other of the two contact rolls 126 or 127 is subjected to higher contact force for the actual measurement of the indentation depth. In order to avoid damage to the paper, however, the contact force of this roll should at most exhaust the latter's elasticity.
From the measured positions, a difference value, which is defined and scaled as a function of hardness, is formed by an electronic unit not illustrated here.
Due to the reference measurement, errors, such as nonparallelism between roll 2 and traverse 11, bending of the traverse 11 or conicity of the roll 2, are also eliminated.
In the embodiment of Figures 4A and 4B, only one single sensor plunger 125 is seated so as to be able to slide with low resistance in the guide elements 122 and 123 on the base plate 121. With the single linear drive 129, the sensor plunger 125 is moved via the yoke 131 axially up to the roll of paper 2 or the like which is to be measured and a defined contact force is exerted. In this embodiment, three contact rolls 126', 126'' and 127' for the roll 2 are seated so as to be able to rotate in ball bearings in a roughly axially parallel arrangement. The middle of the three laterally spaced contact rolls can be displaced with respect to the sensor plunger 125 against the force of a helical compression spring 138. In the relaxed state, the running surface of contact roll 127' projects in comparison to the running surface of the contact rolls 126'and 126''. If the sensor plunger 125 is advanced under axial pressure against the roll 2 (perpendicular to the latter as a rule) until the contact rolls 126',126'' lie against the surface of the roll with contact pressure, the spring 138 is compressed in the direction of the yoke 131 to a greater or lesser extent, depending on the difference in surface hardness in the area of the three contact rolls. A force-measuring cell 139 detects the spring force of the spring 138, which corresponds to the surface hardness profile at the measurement point.
In the third embodiment taccording to Figure 5) a base plate 121 supports, via a tube 140 rigidly connected to it, a fork-shaped mount 141 for a contact roll 127'' seated so as to be able to rotate in ball bearings. An oscillation generator 142 drives a ram or hammer 143 inside the tube 140 against an anvil 144. The contact roll 127'' is thereby advanced momentarily towards the surface of the roll 2. Depending on the surface hardness, the contact roll 127'' recoils more or less strongly. The strength of this recoil can be measured, for example, by an accelerometer cell 145 as a function of the surface hardness of the roll 2.
Moreover, as is evident from Figure 1, larger changes of roll diameter, which exceed the stroke length of the hardness measuring heads, can be measured by radial movement of the entire traverse together with the hardness measuring head. Additional traverse movement possibilities of serve the purpose of being able to move the finished roll out of the winding machine.
In all embodiments, it is possible, with the aid of a position measuring unit for detecting the position of the hardness measuring head along the traverse or the roll to be measured, for a possible thickness variation of the roll in the cross direction of the web, such as a conicity of the roll, to be detected and evaluated.
List of reference numerals 1 Backing roll lA Winding axis 2 Paper roll 10 Frame 11 Traverse 12 Hardness measuring head 13' Line of movement 13'' Line of movement 13'''Line of movement 121 Base plate 122 Guide element 123 Guide element 124 Sensor plunger 125 Sensor plunger 126 Contact roll 126' Contact roll 126''Contact roll 127 Contact roll 127' Contact roll 127''Contact roll 128 Linear drive 129 Linear drive 130 Yoke 131 Yoke 132 Position measuring apparatus 140 Tube 133 Position measuring apparatus 141 Mount 134 Position pick-up plunger 142 Oscillation generator 135 Position pick-up plunger 143 Hammer 136 Clamp 144 Anvil 137 Clamp 145 Accelerometer cell 138 Helical compression spring 139 Force measuring cell
Claims (7)
1. Device for measuring the surface hardness of wound rolls (2) of paper of other material webs, which is equipped with at least one hardness measuring head (12) with at least one contact roll seated so as to be able to rotate for contact under radial pressure on the rotating roll (2) of paper or the like, in which the hardness measuring head (12) can be displaced on a beam (11) or the like, parallel to the winding axis of the roll (2) or the like and which is equipped with means for evaluating the measurement signals of the hardness measuring head (12), characterized in that first and second means are provided, with which at least one of the contact rolls (126,127;126', 126'', 127'') can be held with a first force against the roll (2) and with which at least one of the contact rolls (126,127;127',127'') can push into the surface more deeply with a second force.
2. Device according to Claim 1, characterized in that the beam (11) is fastened on a frame (10) roughly at a right angle to the winding axis, in particular corresponding to the change of the winding diameter of the roll (2) of paper or the like, so as to be moved as a whole with the one or more hardness measuring heads (12).
3. Device according to Claim 1 or 2, characterized in that the hardness measuring head (12) is equipped with at least two contact rolls (126,127,126',127',126'') arranged laterally spaced apart and with means (132,133) for measuring the indentation difference of the contact rolls.
4. Device according to Claim 1 or 2, characterized in that the hardness measuring head (12) is equipped with at least one impact generator (142,143,144) for the radial advancement of the contact roll (127'') against the roll surface and with means (145) for measuring the recoil.
5. Device according to one of Claims 1-4, characterized by means for detecting the position of the hardness measuring head along the width of the roll.
6. Method for measuring the surface hardness of wound rolls of paper or the like, with a device according to one of Claims 1-5, characterized in that the difference of the indentation depth or the recoil of at least one contact roll, held in contact by a roughly radial pressure component on the winding surface of the rotating roll (2) of paper or the like, is continuously or intermittently measured along the winding axis of the roll.
7. Method according to Claim 6, characterized in that the hardness profile detected by the hardness measuring head is passed on to the production machine, and to a longitudinal separating machine or the like for quality and/or quantity improvement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29520709U DE29520709U1 (en) | 1995-12-29 | 1995-12-29 | Device for measuring the surface hardness of wound rolls of paper or the like |
| DE29520709.4 | 1995-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2241889A1 true CA2241889A1 (en) | 1997-07-10 |
Family
ID=8017355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002241889A Abandoned CA2241889A1 (en) | 1995-12-29 | 1996-12-27 | Device and method for measuring the surface hardness of rolls of paper or other material strips |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0870183B1 (en) |
| JP (1) | JP2001507442A (en) |
| AT (1) | ATE189839T1 (en) |
| AU (1) | AU1306497A (en) |
| BR (1) | BR9612391A (en) |
| CA (1) | CA2241889A1 (en) |
| DE (2) | DE29520709U1 (en) |
| ES (1) | ES2145514T3 (en) |
| WO (1) | WO1997024595A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI116582B (en) | 2002-10-24 | 2005-12-30 | Metso Paper Inc | A method for determining a paper elastic modulus |
| US7127951B2 (en) | 2003-11-07 | 2006-10-31 | Kimberly-Clark Worldwide, Inc. | Roll firmness measuring system and process |
| CA2570391A1 (en) * | 2004-07-01 | 2006-01-12 | Metso Paper, Inc. | A reeling method and system as well as an measuring apparatus |
| US7104031B2 (en) | 2004-12-20 | 2006-09-12 | Kimberly-Clark Worldwide, Inc. | Variable position constant force packaging system and process for using same |
| AT505557B1 (en) * | 2008-02-21 | 2009-02-15 | Emco Test Pruefmaschinen Gmbh | DEVICE FOR TESTING HARDNESS OF WORKPIECES |
| WO2010022772A1 (en) * | 2008-08-27 | 2010-03-04 | Metso Paper, Inc. | Device and method of determining an air trapping profile of a fiber web roll in a paper or cardboard machine and use of the device in a reel-up |
| JP2020176015A (en) * | 2019-04-22 | 2020-10-29 | 住友化学株式会社 | Inspection method, resin film roll manufacturing method and resin film roll |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7140841U (en) * | 1972-02-03 | Stoeferle T | Device for continuous hardness measurement | |
| US3194061A (en) * | 1961-07-20 | 1965-07-13 | Beloit Corp | Instrument for measuring hardness of the surface of a resilient roll |
| US3540270A (en) * | 1969-01-16 | 1970-11-17 | Westvaco Corp | Reel hardness tester |
| CA938125A (en) * | 1969-11-05 | 1973-12-11 | L. C. Knight Richard | Roll hardness device |
| DE3204342C2 (en) * | 1982-02-09 | 1985-05-09 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Device for determining the compressibility of a stream of cut tobacco materials |
| IT1163487B (en) * | 1982-07-31 | 1987-04-08 | Hauni Werke Koerber & Co Kg | PROCEDURE AND DEVICE FOR MEASURING THE TOBACCO FILLING FORCE |
| JPS6190038A (en) * | 1984-10-11 | 1986-05-08 | Sanmitsuku Tsusho Kk | Instrument for measuring hardness of winding roll |
| US4991432A (en) * | 1985-05-02 | 1991-02-12 | Measurex | Sensor and system for continuous determination of sheet characteristics |
| CH679889A5 (en) * | 1990-03-12 | 1992-04-30 | Textest Ag | |
| US5282382A (en) * | 1991-09-16 | 1994-02-01 | Champion International Corporation | Roll hardness observation testing apparatus and process |
| DE4139697C2 (en) * | 1991-12-02 | 1994-08-25 | Horst K Veith | Device for testing and measuring mattresses, upholstery or similar flat-elastic objects |
-
1995
- 1995-12-29 DE DE29520709U patent/DE29520709U1/en not_active Expired - Lifetime
-
1996
- 1996-12-27 BR BR9612391A patent/BR9612391A/en not_active Application Discontinuation
- 1996-12-27 EP EP96944659A patent/EP0870183B1/en not_active Expired - Lifetime
- 1996-12-27 AU AU13064/97A patent/AU1306497A/en not_active Abandoned
- 1996-12-27 WO PCT/EP1996/005842 patent/WO1997024595A1/en active IP Right Grant
- 1996-12-27 AT AT96944659T patent/ATE189839T1/en not_active IP Right Cessation
- 1996-12-27 DE DE59604470T patent/DE59604470D1/en not_active Expired - Fee Related
- 1996-12-27 JP JP52402197A patent/JP2001507442A/en active Pending
- 1996-12-27 ES ES96944659T patent/ES2145514T3/en not_active Expired - Lifetime
- 1996-12-27 CA CA002241889A patent/CA2241889A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE29520709U1 (en) | 1997-05-15 |
| BR9612391A (en) | 1999-07-13 |
| DE59604470D1 (en) | 2000-03-23 |
| JP2001507442A (en) | 2001-06-05 |
| EP0870183A1 (en) | 1998-10-14 |
| ES2145514T3 (en) | 2000-07-01 |
| WO1997024595A1 (en) | 1997-07-10 |
| AU1306497A (en) | 1997-07-28 |
| ATE189839T1 (en) | 2000-03-15 |
| EP0870183B1 (en) | 2000-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |