EP1136199A1 - Méthode pour former des rouleaux de produit - Google Patents

Méthode pour former des rouleaux de produit Download PDF

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Publication number
EP1136199A1
EP1136199A1 EP00124891A EP00124891A EP1136199A1 EP 1136199 A1 EP1136199 A1 EP 1136199A1 EP 00124891 A EP00124891 A EP 00124891A EP 00124891 A EP00124891 A EP 00124891A EP 1136199 A1 EP1136199 A1 EP 1136199A1
Authority
EP
European Patent Office
Prior art keywords
roll
web
cutting
elongated
product rolls
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.)
Withdrawn
Application number
EP00124891A
Other languages
German (de)
English (en)
Inventor
Anders Andersson
Christer Kaaling
Rolf Augustsson
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.)
Essity Hygiene and Health AB
Original Assignee
SCA Hygiene Products AB
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
Priority claimed from EP99123556A external-priority patent/EP1103355A1/fr
Application filed by SCA Hygiene Products AB filed Critical SCA Hygiene Products AB
Priority to EP00124891A priority Critical patent/EP1136199A1/fr
Publication of EP1136199A1 publication Critical patent/EP1136199A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/16—Cutting rods or tubes transversely
    • B26D3/164—Cutting rods or tubes transversely characterised by means for supporting the tube from the inside

Definitions

  • This invention relates to a method of forming a web roll product, for example, a roll of tissue paper. More particularly, the method of the invention is concerned with the cutting of individual roll products from a web log roll that is coreless or has a weak core without damaging or destroying the central opening of the roll.
  • Another way is to produce elongated web log rolls of a suitable web length as an intermediate product, with the help of a revolving turret head roll change system or a surface winder system, and then to cut these elongated web log rolls into web product rolls of suitable width using a rotating knife blade.
  • thin-walled cores of different types have come into use. They alleviate the above-mentioned problems, but give rise to new ones, of strength and roll stability, as they are weaker than the thick-walled ones.
  • US. Pat. 4,487,378 discloses the forming of an elongated coreless log of web (such as tissue paper) on a mandrel having a polygonal cross section. The elongated log is pulled off the mandrel after forming. A rotating knife blade then cuts the web log into individual web rolls.
  • web such as tissue paper
  • a problem arising when using rolls with thin or no cores is when the rotating knife blade reaches the center of the log roll, the core of a web log roll or the innermost web layers of a coreless web log roll will initially be deflected a slight distance into the open area in the log roll center, and when the rotating knife blade cuts through into the open area a distortion in the form of a beak will arise.
  • This can give the roll product a bad appearance and also makes it difficult to be able to fit the roll product into a roll dispenser, or for a coreless roll product also makes it difficult to be able to withdraw the web from the center hole.
  • This distortion can also force the rotating knife blade out of its intended straight line, perpendicular to the length of the elongated log roll, making the cut oblique from the center and out to the other side.
  • the edge of the roll can be warped.
  • US Pat 5,271,137 discloses a method for forming a coreless paper roll product, where the cutting into roll segments is done with the mandrel having a polygonal cross-section still partly inside the elongated paper roll to be cut, so that the location of the cut is just outwards from the end of the mandrel.
  • the inner part of the paper roll, making up a pseudocore retains its form during the cutting, and after the cutting can reshape according to the inner stresses.
  • a first aim of the invention is to form a product roll with little or no damage to the core or first windings of the product roll when cutting individual product rolls from an elongated web roll.
  • a second aim of the invention is to alleviate the wobbling of the rotating knife blade caused by uneven heating of the knife blade when cutting individual product rolls from an elongated web roll.
  • Fig 1 is an end view of a cored product roll according to prior art being cut without support from the interior space of the roll at the moment just before the knife blade breaks through into the interior space.
  • Fig 2 is an end view of a cored product roll according to prior art with a typical beak.
  • Fig 3 is a side view of a cored product roll according to prior art with a typical beak and also showing the oblique part of the edge.
  • Fig 4 is an end view of a coreless product roll according to prior art with a typical distortion from the beak effect.
  • Fig 5 is a schematic view of an elongated log roll being cut into product rolls according to the invention.
  • Figure 1 can be seen how a cored roll 1 is being cut without support from an interior space 2 of the roll 1 at the moment just before a rotating knife blade 5 breaks through into the interior space 2.
  • the core 3 is under compression and the core 3 is showing a displacement 4 from the pressure of the rotating knife blade 5 at a contact point with the rotating knife blade 5 edge.
  • Figure 3 shows a sidewise view of the roll from Figure 2 with a beak 6 and the resulting warping 7 of the edge of the roll 1.
  • a web is wound onto an elongated core 112 on a mandrel or directly onto an elongated mandrel either directly from the web production line or when rewinding from a mother roll.
  • the web can be a sheet made up from cellulosic or synthetic fibres, with some additives like fillers or chemicals that will be designed to render certain desired properties or functions to the web.
  • Webs of this type are papers, tissues and nonwovens.
  • the web can also be a more or less homogenous web, where fillers or armouring fibres can be added.
  • Webs of this type are films. Also laminates, integrated structures of at least one base web and addition of at least one other web or any other type of surface-covering addition, can be webs that are well suited for treatment by the method of the invention.
  • the winding is normally done using a well known revolving roll change system where four reciprocally parallel equidistantly mandrels revolve around a common axle parallel with their longitudinal direction.
  • the mandrels each in sequence, pass four stations; adding a core (if the roll is to be cored), waiting/starting a new roll, finishing the roll, and roll take-off.
  • the waiting station the web is led partly around the waiting core on its way to be wound around the roll being finished.
  • the roll being finished has reached its predetermined size, the web is cut off between the waiting station and the finishing station, the trailing end is wound up and fixed onto the finished roll, and the first end part of the severed web is blown around the waiting core to start a new roll.
  • the new roll will during filling continue to revolve until it reaches the finishing station.
  • any other type of rewinding or surface rewinding with a mandrel can also be used. As each elongated roll reaches its predetermined diameter or web length, the web will be cut off, and the next first end part of web will be blown or led around the next core or mandrel to start a new elongated log roll 101.
  • a pseudocore 112 is made up from the few first windings from the first end part of the web.
  • the elongated log roll 101 is then pulled from the mandrel and placed in a cutting location, resting in a tray bed.
  • a first end plate 102 connected to a first transporting chain link 113, is used to hold the elongated log roll 101 during the cutting operation and by the action of the first transporting chain link 113 on the first end plate 102 the elongated log roll 101 is pushed stepwise to each new cutting location.
  • This end plate 102 covering the back end of the elongated log roll 101, is furnished with a gasket 103 to make a gas-tight connection to the end of the elongated roll 101, and can also be equipped with a protruding knob 104 to fit into an interior space 111 of the elongated roll 101 to hold it securely.
  • first transporting chain link 113 For pushing the first end plate 102 and the elongated log roll 101 forward to each new cutting location can instead of the first transporting chain link 113 also be used a hydraulic cylinder, or a pusher arm driven by a stepping motor, or any other suitable pushing means.
  • the gasket 103 can be manufactured from several materials, most preferred is rubber, or be of the grooved metal disk type.
  • the height and form of the knob 104 can vary, but preferred is about 5 mm height with a slight conicity. The diameter of the knob 104 should fit into the interior space 111 of the elongated log roll 101 to be cut. It is also possible to use the method of the invention without any knob 104 at all.
  • the cutting of the elongated log roll 101 is made with a rotating knife blade 109.
  • the rotating knife blade 109 can be either a rotating circular saw or a rotating band saw.
  • a rotating circular knife or a rotating band knife with a preferably symmetrically sharpened edge can also be used.
  • Most preferred is a circular rotating saw.
  • the diameter of a circular saw or knife must exceed double the outer diameter of the elongated log roll 101 to be cut by at least about 100 mm since when using a circular saw or knife only the part of the blade from the edge thereof to the axle can be used for radial movement during the cutting.
  • the front end of the elongated log roll 101 is held during the cutting operation by a second end plate 105, similar to the first end plate 102 at the back end, with a gasket 103 to make a gas-tight connection to the end of the elongated roll 101, and can also be equipped with a protruding knob 104 to fit into the interior space 111 of the elongated log roll 101 to hold it securely.
  • the second end plate 105 is connected to a second transporting chain link 114, and by the action of the second transporting chain link 114 the elongated log roll 101 is retained in its stepwise movement caused by the first transporting chain 113 to each new cutting location.
  • the retaining pressure on the second end plate 105 and therewith also the elongated log roll 101 by the second transporting chain 114 can alternatively be exerted by a hydraulic cylinder, a braker arm driven by a stepping motor or any other suitable retaining force applying means.
  • the two end plates 102,105 can together exert a retaining pressure by the action of the first transporting chain 113 and the second transporting chain 114 to hold the elongated log roll 101 securely and to effect gas-tightening, with the aid of the gaskets 103 at the front and back ends of the elongated log roll 101.
  • the two end plates 102,105 together with the core or pseudocore 112 define an interior space 111 of the elongated log roll 101 with an inner diameter.
  • At least one of the end plates 102,105 is equipped with a threaded nipple 106 for connecting a source of compressed gas.
  • a threaded nipple 106 for connecting a source of compressed gas.
  • the threaded nipple 106 can also be used a fast attachment device of the snap-on type or any other suitable connecting means.
  • pressurized gas pipe, hose or tube 107 from a common factory/plant source.
  • pressurized air gases such as nitrogen or carbon dioxide can also be used.
  • the gas should be dried so as not to bring any water droplets into the product rolls.
  • the gas could be heated, especially when cutting coreless rolls where water can be used for getting better cohesion in the first end part of the web to make a few first windings of the web into a pseudocore and/or as a lubricant to make it easier to pull the elongated log roll 101 off the mandrel. Then the heated gas will assist in drying away this water.
  • pressurized gas that is humidity controlled, with a certain amount of water to adjust humidity in the core or pseudocore 112 or render the cooling effect on the rotating knife blade 109 more effective.
  • the pressurized gas pipe 107 is furnished with gas controller 108 for regulating the gas flow to the elongated log roll 101.
  • the gas controller 108 may include one or more of a flow rate controller, a pressure controller and an on-off controller.
  • the elongated log roll 101 is held tightly between the end plates 102,105, pressurized gas is let into the interior space 111 to a predetermined internal gas pressure of 100 - 1200 kPa, preferably 200 - 800 kPa, and more preferably 200 - 600 kPa.
  • the gas controller means 108 is kept open during the complete cutting of one elongated log roll 101.
  • the gas escaping between the rotating knife blade 109 and the wound web will flow along both sides of the rotating knife blade 109 and carry off some of the heat generated by the cutting action and friction between web or core and the rotating knife blade 109.
  • the gas flow will also act as a lubricating medium between the web or core and the rotating knife blade 109. Thus the heat generated will be less.
  • the pressurized gas can even be cooled to be more effective in its cooling action on the rotating knife blade 109.
  • the pressure from the first transporting chain 113 together with the pressure from the second transporting chain 114 on the end plates 102,105 will force the freshly cut edges together, making the cut gas-tight. If any pressure loss in the interior space 111 has occurred, the gas pressure will now rise again to its predetermined value. The next cut is started and the process is repeated.
  • the pressurized gas is shut off with the gas controller means 108, the front end plate 105 retracted, and the product rolls are removed to free the tray bed for the next elongated log roll 101.
  • the product rolls are then transferred to further processing and/or packaging.
  • the inner diameter of the elongated log roll 101 (and also the resulting roll product) is 10 - 100 mm, preferably 20 - 80 mm.
  • the outer diameter of the elongated log roll 101 is 80 - 800 mm, preferably 90 - 500 mm.
  • One sequence of making the cutting operation is to after placing the elongated log roll 101 in the cutting location: 1) tighten the end plates 102,105; 2) fill the interior space 111 with gas; 3) cut off one product roll; 4) repeat steps 1 to 3; 5) stop the gas feed; 6) move away one end plate 102,105; 7) remove all the product rolls.
  • Another sequence of making the cutting operation is to after placing the elongated log roll 101 in the cutting location: 1) tighten the end plates 102,105; 2) fill the interior space with gas; 3) cut off one product roll; 4) stop the gas feed; 5) move one end plate 102,105; 6) remove the product roll; 7) repeat steps 1 to 6.
  • the invention can of course also be used directly on mother rolls without any intermediate production steps, when they are of a suitable size to fit directly cutting into product rolls.
  • Tests were made in one of the tissue mills of SCA Hygiene Products in Sweden, the Lilla Edet mill.
  • the paper used in the tests was a 1-ply normal tissue paper with the basis weight 25 g/m 2 sold under the trade name MiniTork.
  • the elongated log rolls used were about 2 m long, with an outer diameter of 120 mm and an inner diameter of 71 mm. These were cut into product rolls with a length of 240 mm. The rolls were coreless and had the first windings wetted to create a pseudocore.
  • the cutting was done using a standard rotating circular saw, of the type 'Big Blade', that can be bought from several suppliers.
  • Pressurized air from the normal plant supply was let into the elongated log roll from both end plates.
  • a pressure controller was used to adjust the pressure of the interior space of the roll.
  • the air consumption for cutting these rolls at 400 kPa was about 0,006 kg/sec.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Replacement Of Web Rolls (AREA)
EP00124891A 1999-11-26 2000-11-15 Méthode pour former des rouleaux de produit Withdrawn EP1136199A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00124891A EP1136199A1 (fr) 1999-11-26 2000-11-15 Méthode pour former des rouleaux de produit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99123556A EP1103355A1 (fr) 1999-11-26 1999-11-26 Méthode pour former des rouleaux d'un produit
EP99123556 1999-11-26
EP00124891A EP1136199A1 (fr) 1999-11-26 2000-11-15 Méthode pour former des rouleaux de produit

Publications (1)

Publication Number Publication Date
EP1136199A1 true EP1136199A1 (fr) 2001-09-26

Family

ID=26071595

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00124891A Withdrawn EP1136199A1 (fr) 1999-11-26 2000-11-15 Méthode pour former des rouleaux de produit

Country Status (1)

Country Link
EP (1) EP1136199A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6758923B2 (en) 1999-12-13 2004-07-06 C.G. Bretting Manufacturing Company, Inc. Apparatus and method for applying adhesive in a web converting machine
WO2007004925A1 (fr) * 2005-06-30 2007-01-11 Sca Hygiene Products Ab Procédé et dispositif pour débiter une bûche en papier ou un matériau similaire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1778323A1 (de) * 1968-04-19 1971-09-09 Dynamit Nobel Ag Vorrichtung zum Halten der Stuetzluft bei der Fertigung von verstrecktem Kunststoffrohr
US4487378A (en) * 1982-05-19 1984-12-11 Masashi Kobayashi Coreless toilet paper roll and method for manufacture thereof
US5271137A (en) * 1993-01-22 1993-12-21 James River Paper Company, Inc. Method of forming a coreless paper roll product
US5453070A (en) * 1994-07-12 1995-09-26 James River Paper Company, Inc. System for manufacturing coreless roll paper products

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1778323A1 (de) * 1968-04-19 1971-09-09 Dynamit Nobel Ag Vorrichtung zum Halten der Stuetzluft bei der Fertigung von verstrecktem Kunststoffrohr
US4487378A (en) * 1982-05-19 1984-12-11 Masashi Kobayashi Coreless toilet paper roll and method for manufacture thereof
US5271137A (en) * 1993-01-22 1993-12-21 James River Paper Company, Inc. Method of forming a coreless paper roll product
US5453070A (en) * 1994-07-12 1995-09-26 James River Paper Company, Inc. System for manufacturing coreless roll paper products

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6758923B2 (en) 1999-12-13 2004-07-06 C.G. Bretting Manufacturing Company, Inc. Apparatus and method for applying adhesive in a web converting machine
WO2007004925A1 (fr) * 2005-06-30 2007-01-11 Sca Hygiene Products Ab Procédé et dispositif pour débiter une bûche en papier ou un matériau similaire

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