EP1226025B1 - Damping corrugator roll - Google Patents
Damping corrugator roll Download PDFInfo
- Publication number
- EP1226025B1 EP1226025B1 EP00975985A EP00975985A EP1226025B1 EP 1226025 B1 EP1226025 B1 EP 1226025B1 EP 00975985 A EP00975985 A EP 00975985A EP 00975985 A EP00975985 A EP 00975985A EP 1226025 B1 EP1226025 B1 EP 1226025B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- jacket
- corrugator
- interposed
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/20—Corrugating; Corrugating combined with laminating to other layers
- B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
- B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
- B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
- B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
- B31F1/2863—Corrugating cylinders; Supporting or positioning means therefor; Drives therefor
Definitions
- the invention relates to a damping corrugator roll comprising a cylindrical core and a relatively thin coaxial tubular cylindrical jacket having an outer toothed surface and rotatably supported in a floatable manner on the cylindrical core by an interposed bearing material which fills a hollow space provided between the cylindrical core and the cylindrical jacket.
- the invention particularly relates to a corrugator roll of the above type, provided in combination with an upper corrugator roll, parallel and tangent to said lower roll, both rolls being part of a corrugator unit for paper sheets, in corrugated board fabrication.
- the upper corrugator roll has a greater diameter and is rotatably driven, but it also has peripheral skirt teeth, whereby it meshes with the teeth of the lower corrugator roll, which runs idle and is rotatably dragged along by the upper corrugator roll.
- Vibrations may depend on flexures transverse to the axis of rotation, or on torsional flexures, i.e. in the circumferential direction with respect to the axis of the roll. Vibrations also depend of the shape of the corrugator teeth of the two rolls which, in combination with the paper feed, cause the vibratory motion of the roll. Due to the considerable axial lengths of rolls, the vibratory and/or oscillatory effects are particularly felt in the center part of the roll, i.e. far from the support constraints at the ends thereof. Also, in this center part, the vibratory and/or oscillatory effects are relatively out of control and dependent on the features of the processed paper.
- Prior art damping means can absorb or damp at least part of the vibrations at the end constraints of the lower corrugator roll, but definitely cannot handle neither systematic nor casual oscillations or vibrations (the latter due to modified features of the paper being processed) at the center part of the corrugator roll. Therefore, a relatively poor damping effect is always obtained, whereby to date a still high level of noise is generated by corrugator units, such that it requires expensive and complex acoustical treatments on machines.
- vibrations and/or oscillations cause functional problems, such as the need to limit the production rate because the poor vibration dampening causes a loss of attachment between the layers of the corrugated board and a smaller flute width.
- a vibration-damped paper or cardboard processing roll of the kind described at the beginning and according to the pre-characterizing part of claim 1 is known from the document US-A-5 081 759.
- the hollow space between a rotating roll-shell and a stationary central axis is filled with a fluid which only transfers a supporting hydraulic force from the stationary central axis to the shell but obviously does not provide a friction coupling between the axis and the shell.
- the document GB-A-1 036 922 discloses a vibration-damped paper processing roll with a heavy rotatable core and a light shell slightly movable in relation to the core, the space between the core and the shell being filled with an elastically deformable bearing material, particularly with longitudinal rubber or metal tubes placed close together and filled with compressed air for providing a friction coupling between the cylindrical core and the cylindrical shell.
- the corrugator roll according to the invention is characterized in that
- the interposed or bearing fluids may be provided under pressure, at atmospheric pressure, or in conditions of negative pressure with respect to external atmospheric pressure. This depends on the conditions of use.
- the jacket and the cylindrical core form, e.g. by using rotary sealing heads, a sealed hollow space wherein the interposed material is introduced and replaced from time to time after a predetermined number of operating hours.
- the sealed hollow space formed by the tubular cylindrical jacket and by the cylindrical core may have inlets and outlets for automatic feeding of or filling up with the interposed material, in this case fluid, or for generating a continuous or batch circulation of said fluid, which can provide balanced dynamic conditions in the hollow space as regards pressure and quantity of fluid.
- the circulation of fluid ensures a constant renewal thereof, for instance with respect to the maintenance of a predetermined temperature or of a predetermined mixture composition or condition, or of any other parameter that can be affected by the use and restored by service treatments.
- the sealing means at the heads of the tubular toothed cylindrical jacket are such that they allow, by using yielding members, the jacket to be moved at least transverse to the core.
- the cylindrical jacket has lower weight and inertia values as compared with the central core.
- the length to diameter ratio of the lower roll i.e. of the jacket of the lower roll is higher than 10.
- the jacket shall be relatively thin, but anyway have a sufficient thickness to allow paper processing.
- the diameter to thickness ratio is of 8/1 to 15/1, preferably of about 10/1.
- the thickness of the jacket may range from 10 to 100 mm, particularly from 20 to 50 mm, preferably from 25 to 35 mm.
- the hollow space or chamber, or the difference between the outside diameter of the core and the inside diameter of the jacket is of 0,1 to 5 mm, also depending on the diameter and length of the jacket as well as on the type of interposed material.
- the outer jacket can be made of any suitable material, also composite or in two, three or more layers.
- the material to be used can be steel or other metals, preferably after undergoing hardening treatments, such as quenching or coating with hard layers, e.g. made of tungsten carbide, hard chromium or titanium nitrides.
- the invention is based on the acknowledgement that, during operation, the vibrations in the floating jacket cause variations in the bearing thickness (thickness of the hollow space between the floating jacket and the cylindrical core), hence in the bearing fluid.
- Bearing thickness deformations cause variations in the relative speed of the filling or bearing material, hence variations in the friction coefficient, which have the effect of damping the motions and stresses that generate vibratory motions.
- the arrangement according to the invention leads to unexpected advantages in combination with bthe toothed corrugator rolls .
- An effectively damping lower corrugator roll is the most appetizing and required thing in the field.
- a drastic reduction of the noise generated by vibrations would allow to reduce economic and construction efforts for acoustical treatments.
- the floating suspension of the lower corrugator roll does not require to account for the specificity of shapes or profiles of the corrugator teeth, since such floating suspension allows a wide adaptability to the teeth shapes, as regards both noise generation and functional effectiveness of the corrugator unit. More particularly it has to be noted that the teeth of corrugator rolls cooperating with each other are not designed to lead to a homocinetic kind of motion.
- a cradle made of a series of several wheels or belts.
- Particular advantages results in a corrugator unit of the above mentioned kind in which one of the at least two corrugator rolls has a smaller diameter than the other roll.
- the damping effectiveness obtained by the roll according to the invention also allows to improve the functionality of the corrugator unit, e.g. with reference to the possibility of increasing the corrugated board production rate, without incurring in manufacturing defects, such as gluing defects and/or variations in flute width.
- the invention also relates to further improvements, which form the subject of the dependent claims.
- a corrugator unit comprises a pair of peripherally toothed meshed corrugator rolls 1 and 2.
- One corrugator roll, the upper one 1, has a relatively great diameter and is rotatably supported and driven at its ends.
- the second corrugator roll, the lower one 2 has a considerably smaller diameter and is supported in a pressure cradle, composed of belts, pairs of rollers, or else.
- the lower corrugator roll 2 is pushed with a predetermined force against the upper corrugator roll 1.
- Figs. 1 and 2 are very schematic views of the construction principle of the lower corrugator roll according to the present invention.
- This roll consists of a cylindrical core 102, which has rotary support extensions 202 at its ends, whereby the cylindrical core 102 is mounted for free rotation onto the support frame, for instance of the corrugator unit.
- the cylindrical core 102 is held inside a cylindrical jacket 302, whose inside diameter is greater than the outside diameter of the cylindrical core, thereby forming a cylindrical hollow space 402 between said two parts.
- the hollow space cannot be closed at the end sides.
- the jacket 302 has partial or complete heads 502 through which the extensions 202 for support of the cylindrical core 102 extend, then these heads shall be elastically coupled to the core supporting extensions 202, i.e. so that the tubular cylindrical jacket 402 can move transverse to the cylindrical core, at least within the limits of the order of magnitude of the vibrations to be damped. This is shown by the elements denoted with numeral 602.
- the hollow space 402 can simply contain air at atmospheric pressure, or at different over- or underpressures, or mixtures of gases, liquid fluids or mixtures of liquid fluids, having different, preferably high viscosity values, or highly viscous, or pasty materials, such as fat, or the like.
- Liquid fluids may include water, oil, mixtures of water and oil, plastic polymers in liquid form, and any type of liquid having the physical characteristics fit for the purpose.
- the space 402 can be filled with a solid plastic material of the elastic type, particularly having a highly hysteretic elasticity.
- the fluid materials held in the hollow space 402 preferably have such characteristics as to generate friction coupling between the jacket 302 and the core 102, the friction coefficient being such that it increases as the rotation speed difference between the core and the jacket increases.
- the tubular jacket 302 rotates freely around the core, substantially floating on an intermediate bearing layer.
- the jacket is rotatably driven by the upper corrugator roll 1 against which it is pushed, for instance by the belts 8.
- the core is also rotatably dragged along by the jacket, by being coupled thereto through the fluid or solid bearing substance.
- the rotation of the core is necessary for the storage of a sufficient inertia, which would not be possessed by the jacket alone. Inertia is required to ensure that the motion conditions of the jacket are as independent as possible from small variables of the product or operating conditions.
- the fluid or other mass provides the translation of the jacket vibrations into local variations of width of the hollow space and hence into local variations of speed or local gradients of speed, which locally generate an increase of friction, hence the absorption of the energy caused by vibrations, whereupon the latter are at least partially damped.
- the cylindrical core 102 is generally made of solid steel.
- the jacket may be made of steel or of any other metal, preferably after undergoing surface hardening treatments, such as quenching or coating with layers of a hard material, e.g. tungsten carbide, hard chromium, etc. and/or titanium nitrides.
- a hard material e.g. tungsten carbide, hard chromium, etc. and/or titanium nitrides.
- the thickness of the jacket varies with its diameter, the latter being subject to restrictions based on the length. Generally, with length to diameter ratios higher than 10, the diameter to thickness ratio of the jacket is of 8:1 to 15:1, particularly of 10:1. For usual roll lengths, thickness may range from 10 to 100 mm, particularly from 20 to 50, especially from 25 to 35 mm.
- the hollow space must not be excessively thick. It can have a thickness of 0.1 to 5 mm.
- the cylindrical core 1, with the extensions 202 thereof, is slipped into a jacket element 302, which has an inner layer 3 made of a highly hysteretic elastic plastic material. Said material is preshaped to hold the heads 4 for rotatably sealing the jacket, while allowing transverse staggering movements.
- the layer 3 at the heads of the jacket 302 may have a recess for housing the sealing heads 4, which are properly positioned and locked therein with the desired sealing effect.
- These heads have no support function on the jacket 302 but are only used to contain substances, fluids or liquids held in the hollow space.
- the inner plastic layer 3 can have the function of directly damping vibrations.
- a hollow space may be provided which is filled with air or another fluid, particularly with a viscous liquid.
- the elastic or viscous vibration absorption behavior may be calibrated by combining two or more layers for bearing the jacket 302.
- the layer 3 may also be made of metal while the hollow space alone may be filled with the bearing fluid.
- the heads 4 may have in this case inlets and/or outlets 104 for the bearing and/or interposed fluid. These can be simply used for occasionally filling and/or topping up the hollow space 402 with the bearing fluid.
- the fluid may be made to permanently circulate between a storage tank and the hollow space, thereby allowing adjustment of the physical and/or composition parameters of the fluid, e.g. by adjusting temperature when the roll is in use.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Vibration Prevention Devices (AREA)
- Pulleys (AREA)
Abstract
Description
As a rule, the diameter to thickness ratio is of 8/1 to 15/1, preferably of about 10/1.
Claims (21)
- A damping corrugator roll, comprising a cylindrical core (102) and a relatively thin coaxial tubular cylindrical jacket (302) having an outer toothed surface and rotatably supported in a floatable manner on the cylindrical core (102) by an interposed bearing material (3) which fills a hollow space (402) provided between the cylindrical core (102) and the cylindrical jacket (302),
characterized in thata) the cylindrical core (102) is rotatably supported at its ends (202),b) the interposed bearing material is a liquid fluid material with a high viscosity value or a solid material with a highly hysteretic elastic behaviour,c) the friction coefficient of the interposed bearing material with respect to the outer skin of the cylindrical core (102) and with respect to the inner skirt of the cylindrical jacket (302) increases as the relative speed between the jacket (302) and the core (102) increases. - A roll as claimed in claim 1, characterized in that the bearing or interposed material consists of a liquid, or, for instance in the form of paste, or of a solid material.
- A roll as claimed in one or more of the preceding claims, characterized in that the interposed or bearing fluids may be provided, at atmospheric pressure, under pressure or in conditions of negative pressure with respect to external atmospheric pressure.
- A roll as claimed in one or more of the preceding claims, characterized in that it may be provided that the jacket (302) and the cylindrical core (102) form, e.g. by using rotary sealing heads (4), a sealed hollow space (402) wherein the interposed material is introduced and may be replaced after a predetermined number of operating hours.
- A roll as claimed in one or more of the preceding claims, characterized in that, alternatively, the sealed hollow space (402) formed by the tubular cylindrical jacket (202) and by the cylindrical core (302) may have inlets and outlets (105) for automatic feeding of or filling up with the interposed material, in this case fluid, or for generating a continuous or batch circulation of said fluid, which circulation is controlled so that it can generate balanced dynamic conditions in the hollow space (402) as regards pressure and quantity of fluid.
- A roll as claimed in one or more of the preceding claims, characterized in that, in combination, it comprises means for circulation of the bearing or interposed fluid and means for constant or batch renewal and/or conditioning of said fluid. e.g. with respect to the maintenance of a predetermined temperature or of a predetermined composition or condition of the fluid components.
- A roll as claimed in one or more of the preceding claims, characterized in that the means (5) for sealing the heads of the tubular toothed cylindrical jacket (302) are such that they allow, by using yielding members (602), the jacket (302) to be moved at least transverse to the core (102).
- A roll as claimed in one or more of the preceding claims, characterized in that the cylindrical jacket (302) has lower weight and/or inertia values as compared with the central core (102).
- A roll as claimed in one or more of the preceding claims, characterized in that depending on the length, the length to diameter ratio of the lower roll (2), i.e. of the jacket (302) of the lower roll (2) is higher than 10.
- A roll as claimed in one or more of the preceding claims, characterized in that the jacket (302) is relatively thin, but anyway has a sufficient thickness to allow paper processing.
- A roll as claimed in one or more of the preceding claims, characterized in that the ratio of the diameter of the roll (2) to the thickness of the jacket (302) is of 8/1 to 15/1, preferably of about 10/1.
- A roll as claimed in one or more of the preceding claims, characterized in that the hollow space or chamber (402), or the difference between the outside diameter (1) of the core and the inside diameter of the jacket is of 0,1 to 5 mm, also depending on the diameter and length of the jacket as well as on the type of interposed material.
- A roll as claimed in one or more of the preceding claims, characterized in that it can be made of any suitable material, even composite or composed on one, two, three or more layers.
- A roll as claimed in claim 13, characterized in that the material to be used can be steel or other metals, preferably after undergoing hardening treatments, such as quenching or coating with hard layers, e.g. made of tungsten carbide, hard chromium or titanium nitrides.
- A roll as claimed in one or more of the preceding claims, characterized in that the hollow space (402) may be filled with one, two or more layers of interposed or bearing material, which form a combined filling.
- A roll as claimed in one or more of the preceding claims, characterized in that both the jacket (302) and the material for filling the hollow space (402) are double-, triple-, or multilayer.
- A roll as claimed in one or more of the preceding claims, characterized in that it is provided in combination with another corrugator roll (1), whereto it is tangent, while said other roll (1) meshes by its peripheral teeth with the peripheral teeth of the roll (2), said two rolls (1, 2) being part of a corrugator unit for fabricating corrugated board.
- A roll as claimed in claim 1 and in one or more of the succeeding claims 2 to 17, characterized in that it has no outer toothing and/or it is not part of the corrugator unit.
- A damping corrugator roll according to one or more of the preceding claims, characterized in that it is provided in combination with a corrugator unit, particularly for sheets or webs of paper, or similar, of the type comprising at least two rolls having a toothed or corrugated surface and being mutually engaged and pushed against each other by a predetermined pressure or force, the mutual compression between rolls being exerted over the whole axial length of the rolls through mechanical or magnetic means and in which one of the corrugated rolls is a corrugator roll according to one or more of claims 1 to 18.
- A corrugator roll according to claim 19 characterised in that it is supported by a cradle made of a series of several wheels or belts, the wheels or the belts beign provided in combination with means for regulating the force exerted on the corrugator roll against the cooperating corrugator roll.
- A corrugator roll according to claims 19 or 20, characterized inn that it has a smaller diameter than the other corrugator roll with which it cooperates.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1999SV000036A IT1309926B1 (en) | 1999-11-05 | 1999-11-05 | DAMPING CORRUGATOR CYLINDER. |
ITSV990036 | 1999-11-05 | ||
PCT/EP2000/010795 WO2001032410A1 (en) | 1999-11-05 | 2000-11-02 | Damping corrugator roll |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1226025A1 EP1226025A1 (en) | 2002-07-31 |
EP1226025B1 true EP1226025B1 (en) | 2004-09-15 |
Family
ID=11408364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00975985A Expired - Lifetime EP1226025B1 (en) | 1999-11-05 | 2000-11-02 | Damping corrugator roll |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1226025B1 (en) |
AT (1) | ATE276099T1 (en) |
AU (1) | AU1391001A (en) |
DE (1) | DE60013877T2 (en) |
ES (1) | ES2223609T3 (en) |
IT (1) | IT1309926B1 (en) |
WO (1) | WO2001032410A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6623416B2 (en) * | 1999-06-18 | 2003-09-23 | Marquip, Llc | Single facer with resilient small diameter corrugating roll |
DE10358292B3 (en) † | 2003-12-12 | 2005-01-13 | Shw Casting Technologies Gmbh | Temperature-controlled calender drum to smooth surface of paper web has a slurry-filled void |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1354656A (en) * | 1962-05-30 | 1964-03-06 | Karlstad Mekaniska Ab | Paper calender |
DE3527398A1 (en) * | 1985-07-31 | 1987-02-12 | Kuesters Eduard | ROLLER |
DE3638070A1 (en) * | 1986-11-07 | 1988-05-19 | Voith Gmbh J M | ROLLER |
DE3642090C1 (en) | 1986-12-10 | 1988-07-14 | Peters W Maschf | Single sided corrugated cardboard machine |
DE4318035C2 (en) * | 1993-05-29 | 1997-02-20 | Voith Gmbh J M | Roller with vibration damper |
IT1298011B1 (en) * | 1997-07-11 | 1999-12-20 | Agnati Spa | CORRUGATED GROUP, IN PARTICULAR FOR PAPER SHEETS OR TAPES, OR SIMILAR. |
-
1999
- 1999-11-05 IT IT1999SV000036A patent/IT1309926B1/en active
-
2000
- 2000-11-02 WO PCT/EP2000/010795 patent/WO2001032410A1/en active IP Right Grant
- 2000-11-02 EP EP00975985A patent/EP1226025B1/en not_active Expired - Lifetime
- 2000-11-02 AT AT00975985T patent/ATE276099T1/en not_active IP Right Cessation
- 2000-11-02 DE DE60013877T patent/DE60013877T2/en not_active Expired - Fee Related
- 2000-11-02 AU AU13910/01A patent/AU1391001A/en not_active Abandoned
- 2000-11-02 ES ES00975985T patent/ES2223609T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITSV990036A1 (en) | 2001-05-05 |
WO2001032410A1 (en) | 2001-05-10 |
AU1391001A (en) | 2001-05-14 |
ES2223609T3 (en) | 2005-03-01 |
DE60013877T2 (en) | 2005-09-29 |
DE60013877D1 (en) | 2004-10-21 |
EP1226025A1 (en) | 2002-07-31 |
ATE276099T1 (en) | 2004-10-15 |
IT1309926B1 (en) | 2002-02-05 |
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