EP2055471A1 - Maschine und Verfahren zur Herstellung von Hulsen durch Wickeln von einem oder mehr Streifen Folienmaterial und daraus erhaltene Hulse - Google Patents

Maschine und Verfahren zur Herstellung von Hulsen durch Wickeln von einem oder mehr Streifen Folienmaterial und daraus erhaltene Hulse Download PDF

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Publication number
EP2055471A1
EP2055471A1 EP08425597A EP08425597A EP2055471A1 EP 2055471 A1 EP2055471 A1 EP 2055471A1 EP 08425597 A EP08425597 A EP 08425597A EP 08425597 A EP08425597 A EP 08425597A EP 2055471 A1 EP2055471 A1 EP 2055471A1
Authority
EP
European Patent Office
Prior art keywords
web material
strips
spindle
tube
winding
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Withdrawn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
EP08425597A
Other languages
English (en)
French (fr)
Inventor
Emi Stefani
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.)
Delicarta SpA
Original Assignee
Delicarta SpA
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 Delicarta SpA filed Critical Delicarta SpA
Publication of EP2055471A1 publication Critical patent/EP2055471A1/de
Withdrawn legal-status Critical Current

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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
    • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
    • 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
    • B26D9/00—Cutting apparatus combined with punching or perforating apparatus or with dissimilar cutting apparatus
    • 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
    • B31C11/00—Machinery for winding combined with other machinery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/26—Opening arrangements or devices incorporated in, or attached to, containers
    • B65D3/261—Opening arrangements or devices incorporated in, or attached to, containers the opening arrangement being located in the container side wall
    • B65D3/266—Opening arrangements or devices incorporated in, or attached to, containers the opening arrangement being located in the container side wall forming a helical line of weakness
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/60—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is mounted on a movable carriage
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge
    • 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
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
    • 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
    • B26D2210/00—Machines or methods used for cutting special materials
    • B26D2210/11—Machines or methods used for cutting special materials for cutting web rolls
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
    • B26F1/20—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material with tools carried by a rotating drum or similar support

Definitions

  • the present invention relates to a machine for the production of tubes through winding of one or more strips of web material around a forming spindle, for example and in particular (but not exclusively) strips of cardboard.
  • the invention relates also to a method for the production of tubes of wound web material, as well as to a tube or tubular core for winding rolls and rolls of web material wound around tubes of the above mentioned type.
  • tubular winding cores are produced in machines for continuous production of tubes or of tubular elements, which are subsequently divided into single tubes, which are in turn used in the rewinding machines for the production of logs, rolls or reels of web material. In some applications, the logs are subsequently cut into single small rolls of smaller axial length to be packaged and sold.
  • a machine of this type, also called core winder, is described for example in US-A-5873806 .
  • the tubular winding core is designed in such a way so that it can be removed from the center of the roll, this latter thus can be unwound from the central axis rather than peripherally, as usually occurs with the rolls for domestic use, which normally have a smaller diameter. These latter are necessarily unwound by the user, starting from the outermost turn whilst the tubular core remains inside the roll, until the roll is expired, and it cannot be axially extracted from the roll.
  • the tubular elements from which the tube are obtained for forming the winding cores of the web rolls, tissue paper, but also further articles in sheet form in the form of continuous web, such as non-woven, plastic or the like are generally obtained through helical winding of one or more strips of web material, typically cardboard. When a single strip is used, this is helically wound so that its longitudinal edges overlap between one turn and the other in order to form a continuous element. When tubes of greater consistency are required, two or more strips are helically wound one over the other, duly staggered.
  • the invention provides a machine, or a so-called core winder, for the production of tubes, which can have additional functional features with respect to the features of the tubes generally used for winding rolls for domestic use.
  • the invention discloses a machine for the production of tubes through winding of one or more strips of web material around a forming spindle, comprising: a winding group which winds the strip or the strips around the spindle in order to form a tubular element; and a cutting group, which cuts the tubular element into single tubes; and a member for generating a tearing line, i.e. a weakening line along the tubular element.
  • the tearing or weakening line is a line of preferential tearing along which the tensile resistance of the web material forming the tube is reduced with respect to the resistance of the basic material.
  • a tearing line or weakening line can be a scoring or perforation line formed by a scoring or perforating member.
  • a scoring line can be formed by a superficial cut or notch, or preferably by an intermittent or discontinuous cut or a series of notches in the wall of the tubular element.
  • a perforation line is a line of small cuts, apertures, notches or other discontinuities in the material forming the tube.
  • the tearing line or weakening line can be formed by any kind of means which locally reduces the tensile strength of the material forming the tube, so that the latter tears along the tearing or weakening line by applying a relatively small traction force, such that the user can remove the winding core from the center of a roll and unwind the roll from the hole which has been left free by the removal of the winding core.
  • Amachine according to the invention can produce tubes formed by strips of web material wound, preferably according to a helical development, which can be torn along the perforation line also when around the tube a roll of web material has been formed, as for example tissue paper, plastic film or other.
  • the tubes so produced are particularly suitable for packaging rolls of web material for domestic use, as toilet paper, kitchen towel wound in rolls of limited diameter, typically between 10 and 20 cm.
  • the scoring or perforation, or in general the tearing or weakening line can be a single line or more perforation lines can be provided, preferably with substantially helical development.
  • the inclination of the perforation line or lines can be equal to the inclination along which the strips of web material are helically wound. However, it would also be possible that the perforation lines have a different development, for example a greater or smaller inclination with respect to the inclination of the wound strip or strips, which form the tube.
  • the user can choose between using the roll in a traditional manner, i.e. unwinding it starting from the outmost turn, and using it unwinding it starting from the innermost turn after having removed the tubular winding core, in the same way as it usually occurs with the rolls of great diameter for industrial use.
  • the tubular winding core is extracted simply by pulling it axially, so that it breaks along the scoring line obtained by the core winder during winding the strip or strips, which form the tube.
  • the winding core is produced by winding cardboard strips in such a way that their edges do not overlap, but rather they produce a continuous helical channel. Inside the cardboard strips so helically wound an inner strip is arranged, which is wound without leaving free spaces.
  • the inner strip is of such a grammage that it can be torn easily by pulling the winding core from an end of the roll.
  • the invention relates to a method for producing tubes in wound strips of web material, comprising the steps of:
  • An object of the invention is a tube or tubular core for winding rolls of web material, formed by at least one wound strip of web material, characterized in that it has at least one scoring and tearing line extending along the development of the tube.
  • a further object of the present invention is also a roll of web or sheet material, for example paper, such as tissue paper or the like, wound around a tubular core or tube of the type defined above.
  • Figure 1 shows a core winder or machine for the production of tubes obtained through winding of one or more strips of web material, for example cardboard.
  • the machine illustrated in figure 1 corresponds to the machine described in US-A-5873806 , whose content is integrally incorporated in the present description and which can be referred to for greater construction details on the machine as a whole. It should be understood that, as it will be more apparent from the description below, the invention can be implemented also on core winder having a different configuration, for example as regards the winding group and/or the cutting group.
  • the machine indicated as a whole with the number 2, has a bearing structure 3, which supports a forming spindle 1. This latter is supported through a support 4 in a fixed or rotatable manner. In this later case, the spindle 1 is idle around its longitudinal axis. In some embodiments the spindle 1 can consist of an idle portion and a fixed portion, or can be designed in any other suitable manner.
  • Number 5 indicates as a whole a winding group through which strips S of web material N fed by reels (not shown) are helically wound around the spindle 1.
  • the number of strips of which a tube is formed can vary also in accordance with the mechanical resistance that the tube must have. In some cases it is possible to use a single strip, or rather two or more mutually staggered wound strips.
  • the strip or strips wound around the forming spindle 1 are stabilized through one of the traditional systems, for example by gluing, by means of a glue applied upstream of the winding group in a manner known and therefore not shown.
  • the winding group 5 comprises a belt entrained around an idle pulley 9 and around a motorized pulley 11, the rotation of which is controlled by a motor 13.
  • the belt 7 has a first branch 7A, which forms a helical loop around the spindle 1 and the strip or strips S of web material N which wind around the spindle itself, as well as a straight branch 7B which extends between the two pulleys 9 and 11.
  • the winding group 5 can be adjusted in inclination through a handwheel 17 and a threaded bar 19 so as to adjust the angle of winding of the branch 7A of the belt 7 and thus the inclination of the turns formed by the strips of web material N wound around the forming spindle 1.
  • the strips of web material N are wound and pushed by the belt 7 around and along the spindle 1, thus forming a continuous tubular element T formed by one or more helically wound strips.
  • the winding can be obtained also with a different machine, in which the strips are wound longitudinally, surrounding the forming spindle and arranged with the edges parallel to the axis of the tube being forming and of the forming spindle.
  • the machine 2 Downstream of the winding area, in which the winding group 5 is arranged, the machine 2 has a cutting group indicated as a whole with 31 and which can assume different configurations.
  • the cutting group 31 is provided with an alternating motion according to the double arrow f31 in order to follow the feed movement of the tube being formed around the spindle 1 during a cutting phase and to return to a starting position in the inactive return phase of the cutting device or cutting group 31.
  • the cutting group 31 includes a carriage 33 movable through an actuator. On this carriage cutting wheels or cutting discoidal blades are arranged, which engage and alternatively disengage with respect to the tubular element T being formed around the spindle 1 in order to divide said continuous tubular element T into single tubes or sections of tube.
  • a scoring member 51 which has the function of producing a score or perforation, or tearing line, along the continuous tubular element T formed on the spindle 1.
  • scoring member will be used to designate the unit 51, but it shall be understood that in more general terms the member 51 can be a cutting, perforating or aperturing member, or in general any device suitable to generate a tearing or weakening line, i.e. a line of preferential tearing and/or reduced tensile strength of the basic material forming the tubular element T.
  • the scoring member 51 generates a helical scoring line with an inclination substantially equal to that of the strips of web material N wound around the spindle 1 for forming the tubular element T.
  • this scoring or perforation line can be produced by surrounding the spindle 1 with strips of web material N, which develop longitudinally along the axis of the spindle, i.e. parallel to the axis itself.
  • the scoring line produced by the scoring member 51 will be still helical, whilst the strips will be oriented with an angle equal to 0° with respect to the axis of the tubular element T formed on the spindle 1.
  • the winding angle can be adjusted and modified for example according to the mechanical features, which the tube so produced must have.
  • the inclination of the perforation or scoring angle defined by the orientation of the axis of the tool or engraving member 51, can remain constant, for example equal to an average value comprised between the maximum and the minimum winding angle of the strips S.
  • the scoring member 51 has the shape of a wheel comprising one and preferably two rings 53 of elastically yielding material, for example natural or synthetic rubber. Between the two rings 53 a toothed blade 55 is arranged, constituting the actual scoring or perforating tool.
  • the toothed blade 55 has individual teeth 55A, which penetrate preferably through the entire thickness of the tubular element T, which can be formed from one or more strips of web material N wound around the spindle 1.
  • this latter has preferably a groove 1A inclined with respect to the longitudinal axis of the spindle 1.
  • the groove 1A has an inclination substantially corresponding to the inclination of the helical perforation or scoring line produced by the scoring tool or member 51. It would also be possible to provide on the forming spindle 1 more grooves 1A with adjustable width and/or depth and/or inclination so as to choose the form and/or the dimension and/or the inclination of the perforation line helically formed around the longitudinal development of the tubular element T.
  • Figure 3 schematically shows a portion of a tubular element T formed by one or more strips S of web material N helically wound around the geometrical axis A-A of the tubular element T.
  • B indicates the helical line defined by the longitudinal edges of the strip S of wound web material forming the outer surface of the tubular element T.
  • P indicates a perforation or score line, with helical development, formed by the teeth of the engraving member 51.
  • Figure 4 shows a section according to the line IV-IV of a tubular element T produced through the staggered and overlapping turns of two strips of web material indicated in this figure respectively with S and S1.
  • B indicates the helical line visible on the outer surface of the tubular element T formed by the longitudinal edges of the strip S, whilst inside the tubular element T a helical line B1 will be visible, formed by the longitudinal edges of the inner strip S1.
  • P indicates the scoring or perforation line which, as it is apparent in this enlarged figure, crosses the entire thickness of the tubular element T, i.e. the thickness of both the mutually staggered and overlapping wound strips S, S1.
  • Figure 5 shows a section similar to that of figure 4 , where however the tubular element T is formed by winding only one strip S.
  • the line B is again indicated, formed by the helical wound edge and visible from the outside of the strip S, whilst P indicates the continuous helical perforation line, which in this case crosses the thickness of the single strip S forming the tubular element.
  • Figure 6 shows a roll R of sheet material F wound around a tubular core AT formed by a section of the tubular element T manufactured by the machine 1 and having the structure described above, i.e. constituted by longitudinal or helical winding of one or more strips of web material, with a scoring or tearing or perforation line P preferably with helical development.
  • the end user can easily extract the tubular winding core AT from the roll R by simply grasping an end thereof and tearing by traction according to the arrow f ( figure 6 ).
  • the scoring or perforation line P obtained during the manufacturing phase by the scoring member 51 will break under the effect of the tensile stress exerted, thus allowing extraction of the tubular core T in the form of a helical strip having edges defined by the perforation line P.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Making Paper Articles (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Moulding By Coating Moulds (AREA)
EP08425597A 2007-09-14 2008-09-11 Maschine und Verfahren zur Herstellung von Hulsen durch Wickeln von einem oder mehr Streifen Folienmaterial und daraus erhaltene Hulse Withdrawn EP2055471A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITFI20070205 ITFI20070205A1 (it) 2007-09-14 2007-09-14 "macchina e metodo per la produzione di tubi tramite avvolgimento di una o piu' strisce di materiale nastriforme e tubo cosi' ottenuto"

Publications (1)

Publication Number Publication Date
EP2055471A1 true EP2055471A1 (de) 2009-05-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425597A Withdrawn EP2055471A1 (de) 2007-09-14 2008-09-11 Maschine und Verfahren zur Herstellung von Hulsen durch Wickeln von einem oder mehr Streifen Folienmaterial und daraus erhaltene Hulse

Country Status (2)

Country Link
EP (1) EP2055471A1 (de)
IT (1) ITFI20070205A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102582130A (zh) * 2012-03-29 2012-07-18 天津万华股份有限公司 一种带有划线装置的纸管热挤出机
KR101466347B1 (ko) * 2013-11-06 2014-11-27 도레이첨단소재 주식회사 제거 용이한 지관, 이를 이용한 물품 및 물품의 연속 사용방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397834A (en) * 1967-03-01 1968-08-20 Container Corp Rupturable container
FR2560585A1 (fr) * 1984-03-05 1985-09-06 Sofratube Procede de fabrication d'un tube spirale dechirable, dispositif pour la mise en oeuvre de ce procede et tube spirale ainsi obtenu
DE4336807A1 (de) * 1993-10-28 1995-05-04 Buck Chem Tech Werke Verfahren zum Herstellen von zerlegbaren Behältern aus einer Spiralwickelhülse
US5873806A (en) 1993-10-08 1999-02-23 Fabio Perini, S.P.A. Machine for producing cardboard or similar tubes, with means for cutting the tube into sections of predetermined lengths
WO2004101265A1 (en) * 2003-05-15 2004-11-25 Fabio Perini S.P.A. Machine and method for forming helically wound paper tubes having improved mechanical resistance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397834A (en) * 1967-03-01 1968-08-20 Container Corp Rupturable container
FR2560585A1 (fr) * 1984-03-05 1985-09-06 Sofratube Procede de fabrication d'un tube spirale dechirable, dispositif pour la mise en oeuvre de ce procede et tube spirale ainsi obtenu
US5873806A (en) 1993-10-08 1999-02-23 Fabio Perini, S.P.A. Machine for producing cardboard or similar tubes, with means for cutting the tube into sections of predetermined lengths
DE4336807A1 (de) * 1993-10-28 1995-05-04 Buck Chem Tech Werke Verfahren zum Herstellen von zerlegbaren Behältern aus einer Spiralwickelhülse
WO2004101265A1 (en) * 2003-05-15 2004-11-25 Fabio Perini S.P.A. Machine and method for forming helically wound paper tubes having improved mechanical resistance

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102582130A (zh) * 2012-03-29 2012-07-18 天津万华股份有限公司 一种带有划线装置的纸管热挤出机
KR101466347B1 (ko) * 2013-11-06 2014-11-27 도레이첨단소재 주식회사 제거 용이한 지관, 이를 이용한 물품 및 물품의 연속 사용방법
WO2015068972A1 (ko) * 2013-11-06 2015-05-14 도레이첨단소재 주식회사 제거 용이한 지관, 이를 이용한 물품 및 물품의 연속 사용방법
CN104837755A (zh) * 2013-11-06 2015-08-12 东丽先端素材株式会社 易移除纸管、使用该纸管的制品和连续使用该制品的方法
TWI552943B (zh) * 2013-11-06 2016-10-11 東麗先端素材股份有限公司 可容易移開的紙管、使用該紙管的物品、及連續使用該物品的方法
EP2907782A4 (de) * 2013-11-06 2017-01-25 Toray Advanced Materials Korea Inc. Leicht entfernbare papierhülse, artikel damit und verfahren zur kontinuierlichen verwendung des artikels
RU2612435C2 (ru) * 2013-11-06 2017-03-09 Торэй Эдванст Матириалз Корея Инк. Легко удаляемая бумажная втулка, изделие, использующее бумажную втулку, и способ последовательного использования изделий
US9708153B2 (en) 2013-11-06 2017-07-18 Toray Advanced Materials Korea Inc. Easily removable paper tube, article using the paper tube, and method for successively using the articles

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Publication number Publication date
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