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WO1997001441A1 - Procede pour realiser un tube en carton multigrade - Google Patents

Procede pour realiser un tube en carton multigrade Download PDF

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Publication number
WO1997001441A1
WO1997001441A1 PCT/FI1996/000377 FI9600377W WO9701441A1 WO 1997001441 A1 WO1997001441 A1 WO 1997001441A1 FI 9600377 W FI9600377 W FI 9600377W WO 9701441 A1 WO9701441 A1 WO 9701441A1
Authority
WO
WIPO (PCT)
Prior art keywords
plies
strength
structural
tube
ply
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.)
Ceased
Application number
PCT/FI1996/000377
Other languages
English (en)
Inventor
Markku Järvinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ahlstrom Cores Oy
Original Assignee
Ahlstrom Cores Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ahlstrom Cores Oy filed Critical Ahlstrom Cores Oy
Priority to AU62268/96A priority Critical patent/AU6226896A/en
Publication of WO1997001441A1 publication Critical patent/WO1997001441A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C1/00—Making tubes or pipes by feeding at right angles to the winding mandrel centre line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

  • the present invention relates to a method according to the preamble of claim 1 of constructing a multi-grade paperboard tube.
  • Multi-grade paperboard tubes are manufactured, on the one hand, when it is desired to provide the innermost, outer ⁇ most, or both surfaces of the tube with certain special properties or, on the other hand, when a compromise is required between the technical properties, i.e. various strength properties, and the overall manufacturing costs. Manufacturing costs may be lowered, e.g, by using less expensive, lower-strength paperboard in some groups of paperboard plies of a tube having a certain wall thick ⁇ ness. The higher the strength of the paperboard grade, the more expensive it usually is and vice versa.
  • the surface structure of a tube comprises two layers or plies, i.e., a paperboard ply, which is called an exterior layer or an exterior ply and which is located on the surface of the tube, and a layer or ply underneath it, i.e., a so-called underneath-exterior ply.
  • a paperboard ply which is called an exterior layer or an exterior ply and which is located on the surface of the tube, and a layer or ply underneath it, i.e., a so-called underneath-exterior ply.
  • the inner sur ⁇ face or the bottom structure of the tube is comprised of an interior layer or ply or a bottom ply.
  • there is one interior ply Depending on the purpose for use, the materials of these exterior, underneath-exterior, and interior plies are so selected as to reach the desired surface property.
  • Structural plies are those plies/groups of plies which are disposed between the interior ply and the underneath-exterior ply. In special cases, the interior ply may be a structural ply. As implied by their name, the structural plies constitute the load-bearing or primary structure of a paperboard tube. In those paperboard tubes which have an exacting task, such as, e.g., tubes intended for shaftless wind ⁇ ing/unwinding of a paper web, the strength of the interior ply has to be high. In this kind of tubes, the strength of the interior ply is often of the same level as that of the structural plies.
  • the group of plies is a whole composed of at least two paperboard plies having a certain strength level and certain width. Successive groups of plies may be of the same or different strength level, but they are of a different width.
  • Multi-grade tubes have been known in the art for quite a long time.
  • a multi-grade tube of this kind is disclosed, e.g., in European patent application 0 627 306 Al.
  • a higher density material is, as known, disposed on the exterior of the tube.
  • EP 0 627 306 Al by arranging the paperboard grades of the highest density centrally within the tube wall, or slightly towards the inside wall surface, the desired compressive strength is achieved more advantageously than what is known in the art.
  • the invention disclosed in publication EP 0 627 306 Al is a multi-grade tube construction, where the highest den ⁇ sity paperboard grades are disposed centrally within the wall, or slightly inwardly therefrom, whereby the desired compressive strength is achieved more advantageously than what is known in the art.
  • An object of the present invention is to avoid drawbacks and actual misunderstandings related to tubes of prior art, e.g., those mentioned in publication EP 0 627 306 Al, as well as to provide an improved method of con ⁇ structing a multi-grade paperboard tube.
  • An object of the present invention is thereby to provide a solution by which it is possible to meet the new challenges brought by the devel ⁇ opment of, e.g., paper machines and concerning these tubes. Exacting use conditions and the ambition to pro ⁇ quiz rolls which are bigger and bigger in weight call for ever better tube properties and a higher assurance that the strength properties of tube which are critical to paper reeling meet the requirements. By utilizing the solution according to the invention, it is possible to manufacture a tube from existing paperboard materials, which meets both technical and economical requirements.
  • An improved multi-grade paperboard tube manufactured by the method of the present invention is made by construct ⁇ ing it on the basis of the stresses developed in actual use. Thereby, the data obtained from knowing or evaluat- ing the stress distribution in each actual instance of use is utilized in building up the tube structure.
  • the tube structure composed of paperboard plies is so arranged in accordance with known or evaluated stress distribution that the strength gradation of paperboard plies calcu ⁇ lated on the basis of stress distribution at each ply or group of plies is applied to each ply or group of plie in the tube wall.
  • a multi-grade structure i brought about, which enables an increase in the tub capacity or a removal of over-dimensions, in a tube whic is typically homogeneous in material, from those group of plies, in which the stresses are lower.
  • the present patent application handles those matter which are crucial in evaluating the capacity of paperboard tube.
  • the capacity in this context means tha the use conditions at each time have been counted in th design of the tube structure. Counting the use condi tions in the design of the tube structure means that w either know or are able to reliably evaluate and control the stresses developed at each actual use condition.
  • tubes can be of multi-grade type, e.g., for economical reasons. I this case, material lower in strength is applied to th surface side of the tube wall. It is not applied to the inner side as erroneously taught in publication EP 0 627 306 Al.
  • the frictio properties of the interior ply surface of the tub intended for shaftless winding/unwinding of a paper we are of a great significance when the expediency of the tube is evaluated.
  • the adhesion of the interior ply to the reeling shaft has to be good in order to prevent the entirety formed by the tube and the paper web to be wound thereon from slipping respective of the reeling shaft. Such slipping would damage the tube, whereby the reeling would fail. Consequences of this kind of disturbance are evident.
  • the maximum value of the main stresses of the delamination strength is slightly inwar ⁇ dly from the center of the tube wall cross section.
  • the inner dimension of the tube radius is 38.1 mm and the outer dimension 51.1, the wall thickness being thereby 13 mm.
  • the stress distribution within the tube wall it is essential to recognize the stress, the alteration of the strength property corresponding to which stress in the raw material (paperboard) makes it possible to influ- ence the strength of the ply forming a single layer of the tube wall.
  • the stress peak of the main stresses which are most important to the delamination strength, is slightly radially inwardly from the circumference corresponding to the center of the tube wall.
  • the tube is susceptible to various stresses in use, e.g., in a paper roll.
  • the tube serves as the only shaft, bearing the weight of the paper roll either com ⁇ pletely or partially, the weight being potentially added with the pressure caused by accelerating belts needed for automatic roll change.
  • the tube is susceptible to various stresses, which strain the tube and may lead to its breakage.
  • a paperboard tube is an orthotropic material, recognition of such stresses is an exacting task.
  • advanced modelling methods it is possible to analyze shear, compressive, and tensile stresses to find out where various stresses occur and also how deep in the tube wall they appear in actual use.
  • the results of an analysis of this kind may be experimentally certified, e.g., with a device and method in accordance with Euro ⁇ pean patent 309 123.
  • the test method in accordance with EP 309 123 enables simulating of tube stress states in use conditions. These stress states may then be modelled by means of computationally demanding finite-element methods.
  • the stress analyses of chuck loading of tubes have revealed that the greatest stresses are in about the center of the tube wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Making Paper Articles (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un tube en carton multigrade, dans lequel la solidité du tube en carton multigrade est ajustée en fonction des conditions d'utilisation ou d'essais simulant les conditions d'utilisation, c'est-à-dire en fonction de la répartition connue ou estimée des contraintes. La solidité des groupes de couches structurales de carton utilisées pour la paroi du tube augmente progressivement, en commençant par la couche la plus à l'intérieur, c'est-à-dire la couche la plus basse, et en allant vers la circonférence extérieure de la paroi du tube. Dans ces conditions, au niveau de la circonférence correspondant au centre de la paroi du tube ou au voisinage immédiat de celui-ci et, de préférence, légèrement radialement à l'intérieur par rapport au centre de la paroi du tube, est disposé un groupe de couches structurales constituées par le carton le plus solide disponible et la solidité des groupes de couches rigides devient progressivement plus basse quand on va de ladite circonférence vers la circonférence extérieure des parois du tube. Cette graduation de solidité suit sensiblement la répartition des contraintes d'utilisation connues ou évaluées à partir de conditions d'utilisation ou d'essais simulées du tube.
PCT/FI1996/000377 1995-06-29 1996-06-27 Procede pour realiser un tube en carton multigrade Ceased WO1997001441A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62268/96A AU6226896A (en) 1995-06-29 1996-06-27 Method of constructing a multi-grade paperboard tube

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI953239A FI953239L (fi) 1995-06-29 1995-06-29 Sekarakenteinen kartonkilevy
FI953239 1995-06-29

Publications (1)

Publication Number Publication Date
WO1997001441A1 true WO1997001441A1 (fr) 1997-01-16

Family

ID=8543703

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000377 Ceased WO1997001441A1 (fr) 1995-06-29 1996-06-27 Procede pour realiser un tube en carton multigrade

Country Status (3)

Country Link
AU (1) AU6226896A (fr)
FI (1) FI953239L (fr)
WO (1) WO1997001441A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309123A2 (fr) * 1987-09-21 1989-03-29 A. Ahlstrom Corporation Méthode pour tester un noyau
EP0627306A1 (fr) * 1993-06-04 1994-12-07 Sonoco Products Company Tubes en carton multigrade ayant une résistance à pression améliorée
WO1995019930A1 (fr) * 1994-01-21 1995-07-27 Sonoco Products Company Axes d'enroulement pour bobines de fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309123A2 (fr) * 1987-09-21 1989-03-29 A. Ahlstrom Corporation Méthode pour tester un noyau
EP0627306A1 (fr) * 1993-06-04 1994-12-07 Sonoco Products Company Tubes en carton multigrade ayant une résistance à pression améliorée
WO1995019930A1 (fr) * 1994-01-21 1995-07-27 Sonoco Products Company Axes d'enroulement pour bobines de fil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY, Vol. 112, 1990, T.D. GERHARDT, "External Pressure Loading of Spiral Paper Tubes: Theory and Experiment", pp. 144-150. *

Also Published As

Publication number Publication date
FI953239A7 (fi) 1996-12-30
FI953239L (fi) 1996-12-30
AU6226896A (en) 1997-01-30
FI953239A0 (fi) 1995-06-29

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