EP1598297B1 - Core for rolls of sheet material - Google Patents

Core for rolls of sheet material Download PDF

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Publication number
EP1598297B1
EP1598297B1 EP04425350A EP04425350A EP1598297B1 EP 1598297 B1 EP1598297 B1 EP 1598297B1 EP 04425350 A EP04425350 A EP 04425350A EP 04425350 A EP04425350 A EP 04425350A EP 1598297 B1 EP1598297 B1 EP 1598297B1
Authority
EP
European Patent Office
Prior art keywords
core
ribs
corrugated
side wall
comprised
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
Application number
EP04425350A
Other languages
German (de)
French (fr)
Other versions
EP1598297A1 (en
Inventor
Giovanni Scotuzzi
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.)
Promopack SpA
Original Assignee
Promopack 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 Promopack SpA filed Critical Promopack SpA
Priority to EP04425350A priority Critical patent/EP1598297B1/en
Priority to PL04425350T priority patent/PL1598297T3/en
Priority to DE602004004374T priority patent/DE602004004374T2/en
Priority to SI200430227T priority patent/SI1598297T1/en
Priority to ES04425350T priority patent/ES2279331T3/en
Publication of EP1598297A1 publication Critical patent/EP1598297A1/en
Application granted granted Critical
Publication of EP1598297B1 publication Critical patent/EP1598297B1/en
Priority to HR20070105T priority patent/HRP20070105T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/67—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material
    • B65D85/671—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material wound in flat spiral form
    • B65D85/672—Containers, packaging elements or packages, specially adapted for particular articles or materials for web or tape-like material wound in flat spiral form on cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/50—Storage means for webs, tapes, or filamentary material
    • B65H2701/51—Cores or reels characterised by the material
    • B65H2701/512—Cores or reels characterised by the material moulded
    • B65H2701/5122—Plastics

Definitions

  • the present invention refers to a core for rolls of sheet material, in particular stretch film for packaging, such as LLDPE (linear low density polyethylene) film.
  • LLDPE linear low density polyethylene
  • tubular cores made of cardboard or plastic, mainly of PVC (polyvinyl chloride).
  • PVC cores besides being very expensive, have the drawback of not being compatible with other materials making up the roll, such as, for example, polyethylene; consequently they present known recycling problems.
  • Cardboard cores also present recycling problems because of the high silicate content.
  • cardboard cores cannot be used in open environments because they suffer rapid deterioration due to damp.
  • cores according to the prior art often require additional plastic bushes, which are placed at the end of the core to allow the user to grip the core avoiding burning his/her hands because of sliding friction with the smooth surface of the core. Obviously the bushes add to the cost of the core.
  • US-A-3 856 229 and DE-U-8713881 disclose a core for rolls comprising a corrugated side wall with ribs oriented longitudinally. Such an arrangement does not provide stiffness and mechanical resistance to the radial stress exerted by a rolled film on the core.
  • the object of the present invention is to overcome the drawbacks of the prior art, providing a core for rolls of sheet material that is practical, inexpensive, simple to produce and at the same time able to ensure good stiffness and mechanical resistance to deformation.
  • Another object of the present invention is to provide such a core for rolls of sheet material that is compatible with the web of the roll and at the same time recyclable.
  • the core for rolls of sheet material according to the invention comprises a corrugated side wall. In this manner it is possible to save on the thickness of the material, which forms the core, at the same time ensuring an adequate stiffness and resistance to deformation of the core.
  • Figure 1 illustrates a core 1, substantially tubular, hollow on the inside and comprising a corrugated side wall 2.
  • the corrugated side wall 2 has a plurality of annular ribs 3 which protrude radially outward alternating with a plurality of annular ribs 4 which protrude radially inward.
  • the outer ribs 3 define annular spaces 30 inside the core 1 and the inner ribs 4 define annular spaces 40 outside the core 1.
  • the outer ribs 3 and the inner ribs 4 have a substantially rectangular profile in axial section and the longitudinal dimension a of the outer ribs 3 is substantially equal to the longitudinal dimension a of the inner ribs 4.
  • the corrugated wall 2 seen in axial section, takes on a substantially square wave pattern.
  • the longitudinal size a of each rib 3, 4 of the corrugated wall 2 can vary in the range from 3.4 mm to 3.8 mm. It is clear that the greater the density of ribs (3, 4) distributed over the length of the core 1, the smaller the longitudinal size a of the ribs and the greater the resistance to deformation of the core 1.
  • the length of the core 1 can be variable, according to requirements.
  • the thickness s of the corrugated side wall 2 of the core is fairly small.
  • the thickness s of the corrugated side wall 2 can range from 5 mm to 7 mm, depending upon some parameters, such as the material used, the core stiffness required and the density of the ribs (3, 4).
  • bush portions 5 are formed at the ends of the core 1. Each bush portion is defined by a substantially curved profile 6 on the outer side surface of the core 1.
  • the bush portions 5 are of such a shape as to facilitate gripping of the core manually by the user.
  • the core 1 has an inside diameter ⁇ i defined by the inner ends of the inward protruding ribs 4 and an outside diameter ⁇ e defined by the outer ends of the outward protruding ribs 3.
  • the inside diameter ⁇ i is chosen according to the type of winding mandrel on which the core 1 is mounted.
  • the outside diameter ⁇ e is chosen according to the stiffness, to the hardness and to the resistance of the material used to produce the core 1 and according to the overall weight of the roll which is wound on the core 1. Obviously, a great difference between the outside diameter ⁇ e and the inside diameter ⁇ i causes a weakening of the ribs 3 and 4 of the corrugated wall; on the other hand, a small difference between the outside diameter ⁇ e and the inside diameter ⁇ i causes a strengthening of the ribs 3 and 4 of the corrugated wall.
  • the inside diameter ⁇ i can vary from 20 mm to 80 mm.
  • four intermediate values for the diameter ⁇ i are preferably chosen, namely 25 mm, 38 mm, 50 mm and 76 mm.
  • the outside diameter ⁇ e can vary according to the values set out in the table below: ⁇ i (mm) ⁇ e (mm) 25 34 - 37 38 47 - 50 50 59 - 63 76 85 - 95
  • the core 1 according to the invention thanks to the corrugated part 2, ensures a resistance to deformation and stiffness comparable with those of a conventional core having a considerably larger thickness, with a considerable saving in material for production of the core 1.
  • the core 1 according to the invention is preferably produced by extrusion of plastic materials.
  • PE polyethylene
  • LLDPE linear low density polyethylene
  • Said PE core 1 presents the further advantage of also being able to be used outdoors and in damp environments since it does not suffer damp.
  • the corrugated core 1 according to the invention weighs about 90 g compared with the 300 g of a conventional cardboard core and with the 480 g of a conventional PVC core.
  • the corrugated core 1 according to the invention costs about one-third with respect to the conventional cardboard core and about one-ninth with respect to the conventional PVC core.

Landscapes

  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Description

  • The present invention refers to a core for rolls of sheet material, in particular stretch film for packaging, such as LLDPE (linear low density polyethylene) film.
  • At present rolls of sheet material are generally wound on tubular cores made of cardboard or plastic, mainly of PVC (polyvinyl chloride).
  • The cores of the prior art have some drawbacks.
  • In fact, in order to be able to support the roll adequately, such cores are of great thickness with the result of an excessive waste of material, of a high core weight and of consequent transport problems.
  • PVC cores, besides being very expensive, have the drawback of not being compatible with other materials making up the roll, such as, for example, polyethylene; consequently they present known recycling problems.
  • Cardboard cores also present recycling problems because of the high silicate content. In addition, cardboard cores cannot be used in open environments because they suffer rapid deterioration due to damp.
  • Furthermore, cores according to the prior art often require additional plastic bushes, which are placed at the end of the core to allow the user to grip the core avoiding burning his/her hands because of sliding friction with the smooth surface of the core. Obviously the bushes add to the cost of the core.
  • US-A-3 856 229 and DE-U-8713881 disclose a core for rolls comprising a corrugated side wall with ribs oriented longitudinally. Such an arrangement does not provide stiffness and mechanical resistance to the radial stress exerted by a rolled film on the core.
  • The object of the present invention is to overcome the drawbacks of the prior art, providing a core for rolls of sheet material that is practical, inexpensive, simple to produce and at the same time able to ensure good stiffness and mechanical resistance to deformation.
  • Another object of the present invention is to provide such a core for rolls of sheet material that is compatible with the web of the roll and at the same time recyclable.
  • These objects are achieved in accordance with the invention with the characteristics listed in appended independent claim 1.
  • Advantageous embodiments of the invention are apparent from the dependent claims.
  • The core for rolls of sheet material according to the invention comprises a corrugated side wall. In this manner it is possible to save on the thickness of the material, which forms the core, at the same time ensuring an adequate stiffness and resistance to deformation of the core.
  • Further characteristics of the invention will be made clearer by the detailed description that follows, referring to a purely exemplary and therefore non limiting embodiment thereof, illustrated in the appended drawings, in which:
    • Figure 1 illustrates a partially broken off perspective view of a core for rolls of sheet material according to the invention, and
    • Figure 1A is an enlarged view of the detail enclosed in the circle A of Figure 1.
  • Figure 1 illustrates a core 1, substantially tubular, hollow on the inside and comprising a corrugated side wall 2. The corrugated side wall 2 has a plurality of annular ribs 3 which protrude radially outward alternating with a plurality of annular ribs 4 which protrude radially inward. The outer ribs 3 define annular spaces 30 inside the core 1 and the inner ribs 4 define annular spaces 40 outside the core 1.
  • With reference to Figure 1A, the outer ribs 3 and the inner ribs 4 have a substantially rectangular profile in axial section and the longitudinal dimension a of the outer ribs 3 is substantially equal to the longitudinal dimension a of the inner ribs 4. In this manner, the corrugated wall 2, seen in axial section, takes on a substantially square wave pattern. Purely by way of non limiting example, the longitudinal size a of each rib 3, 4 of the corrugated wall 2 can vary in the range from 3.4 mm to 3.8 mm. It is clear that the greater the density of ribs (3, 4) distributed over the length of the core 1, the smaller the longitudinal size a of the ribs and the greater the resistance to deformation of the core 1.
  • The length of the core 1 can be variable, according to requirements.
  • The thickness s of the corrugated side wall 2 of the core is fairly small. By way of example, the thickness s of the corrugated side wall 2 can range from 5 mm to 7 mm, depending upon some parameters, such as the material used, the core stiffness required and the density of the ribs (3, 4).
  • Two bush portions 5 are formed at the ends of the core 1. Each bush portion is defined by a substantially curved profile 6 on the outer side surface of the core 1. The bush portions 5 are of such a shape as to facilitate gripping of the core manually by the user.
  • The core 1 has an inside diameter φi defined by the inner ends of the inward protruding ribs 4 and an outside diameter φe defined by the outer ends of the outward protruding ribs 3.
  • The inside diameter φi is chosen according to the type of winding mandrel on which the core 1 is mounted. The outside diameter φe, on the other hand, is chosen according to the stiffness, to the hardness and to the resistance of the material used to produce the core 1 and according to the overall weight of the roll which is wound on the core 1. Obviously, a great difference between the outside diameter φe and the inside diameter φi causes a weakening of the ribs 3 and 4 of the corrugated wall; on the other hand, a small difference between the outside diameter φe and the inside diameter φi causes a strengthening of the ribs 3 and 4 of the corrugated wall.
  • Purely by way of non-limiting example, the inside diameter φi can vary from 20 mm to 80 mm. In the present invention four intermediate values for the diameter φi, are preferably chosen, namely 25 mm, 38 mm, 50 mm and 76 mm.
  • In accordance with the inside diameter φi, the outside diameter φe, on the other hand, can vary according to the values set out in the table below:
    φi (mm) φe (mm)
    25 34 - 37
    38 47 - 50
    50 59 - 63
    76 85 - 95
  • In any case it should be noted that the core 1 according to the invention, thanks to the corrugated part 2, ensures a resistance to deformation and stiffness comparable with those of a conventional core having a considerably larger thickness, with a considerable saving in material for production of the core 1.
  • The core 1 according to the invention is preferably produced by extrusion of plastic materials. PE (polyethylene)-based materials and particularly LLDPE (linear low density polyethylene) are advantageously used. In this manner the core 1 is compatible with LLDPE films, thus even if it is in contact with some coils of the LLDPE film it is completely recyclable without any need to separate the two products.
  • Said PE core 1 presents the further advantage of also being able to be used outdoors and in damp environments since it does not suffer damp.
  • By way of example, the corrugated core 1 according to the invention weighs about 90 g compared with the 300 g of a conventional cardboard core and with the 480 g of a conventional PVC core. As a result, the corrugated core 1 according to the invention costs about one-third with respect to the conventional cardboard core and about one-ninth with respect to the conventional PVC core.
  • Numerous variations and modifications of detail within the reach of a person skilled in the art can be made to the present invention without thereby departing from the scope of the invention as set forth in the appended claims.

Claims (14)

  1. A core (1) for rolls of sheet material with a corrugated side wall (2), characterised in that said corrugated side wall (2) comprises a plurality of annular ribs (3) protruding radially outward, alternating with a plurality of annular ribs (4) protruding radially inward.
  2. A core (1) according to claim 1, characterised in that said outward protruding ribs (3) define respective annular spaces (30) inside said core (1) and said inward protruding ribs (4) define annular spaces (40) outside said core (1).
  3. A core (1) according to claim 1 or 2, characterised in that said outer ribs (3) and said inner ribs (4) have a substantially rectangular profile in axial section, so that said corrugated wall (2) has a substantially square wave shape in axial section.
  4. A core (1) according to any one of the preceding claims, characterised in that the thickness (s) of said corrugated side wall (2) is comprised in the range from 5 mm to 7 mm.
  5. A core (1) according to claim 3 or 4, characterised in that the longitudinal size (a) of said outer ribs (3) is substantially equal to the longitudinal size (a) of said inner ribs (4).
  6. A core (1) according to claim 5, characterised in that the longitudinal size (a) of said outer ribs (3) and of said inner ribs (4) is comprised in the range from 3.4 mm to 3.8 mm.
  7. A core (1) according to any one of the preceding claims, characterised in that said corrugated wall (2) has an inside diameter (φi) comprised between 20 mm and 80 mm.
  8. A core (1) according to claim 7, characterised in that said inside diameter (φi) is chosen between the following values: 25 mm, 38 mm, 50 mm and 76 mm.
  9. A core (1) ccording to any one of the preceding claims, characterised in that said corrugated wall (2) has an outside diameter (φe) comprised between 34 mm and 95 mm.
  10. A core (1) according to any one of the preceding claims, characterised in that it comprises, at least at one of its ends, a bush (5) defined by a substantially arched profile (6) to allow manual gripping by the user.
  11. A core (1) according to claim 10, characterised in that said bush (5) is made integral and in a single piece with said corrugated side wall (2).
  12. A core (1) according to any one of the preceding claims, characterised in that it is produced by extrusion of plastic material.
  13. A core (1) according to claim 12, characterised in that it is made of PE (polyethylene)-based material.
  14. A core (1) according to any one of the preceding claims, characterised in that it is used for winding sheets of stretch packaging material, such as LLDPE (linear low density polyethylene).
EP04425350A 2004-05-17 2004-05-17 Core for rolls of sheet material Expired - Lifetime EP1598297B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP04425350A EP1598297B1 (en) 2004-05-17 2004-05-17 Core for rolls of sheet material
PL04425350T PL1598297T3 (en) 2004-05-17 2004-05-17 Core for rolls of sheet material
DE602004004374T DE602004004374T2 (en) 2004-05-17 2004-05-17 Core for rolls of foil material
SI200430227T SI1598297T1 (en) 2004-05-17 2004-05-17 Core for rolls of sheet material
ES04425350T ES2279331T3 (en) 2004-05-17 2004-05-17 SOUL FOR ROLLS OF LAMINARY MATERIAL.
HR20070105T HRP20070105T3 (en) 2004-05-17 2007-03-16 Core for rolls of sheet material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425350A EP1598297B1 (en) 2004-05-17 2004-05-17 Core for rolls of sheet material

Publications (2)

Publication Number Publication Date
EP1598297A1 EP1598297A1 (en) 2005-11-23
EP1598297B1 true EP1598297B1 (en) 2007-01-17

Family

ID=34932499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425350A Expired - Lifetime EP1598297B1 (en) 2004-05-17 2004-05-17 Core for rolls of sheet material

Country Status (6)

Country Link
EP (1) EP1598297B1 (en)
DE (1) DE602004004374T2 (en)
ES (1) ES2279331T3 (en)
HR (1) HRP20070105T3 (en)
PL (1) PL1598297T3 (en)
SI (1) SI1598297T1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7712700B2 (en) 2007-10-02 2010-05-11 Sonoco Development, Inc. Clean-release tape core
IT1400701B1 (en) * 2010-06-23 2013-06-28 Colines Spa TUBULAR SUPPORT FOR THE WINDING OF MATERIAL IN THE SHEET
DE102011075142A1 (en) * 2011-05-03 2012-11-08 Polycine Gmbh rewinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1258421A (en) * 1960-03-04 1961-04-14 Teco Cylinder for textile, paper and similar industries
US3856229A (en) * 1973-12-06 1974-12-24 Ibm Web winding spool
DE8713881U1 (en) * 1987-10-15 1989-02-09 Kunststoff-Spritzgußwerk Ing. Klaus Burk KG, 5063 Overath Winding body
DE19507514C2 (en) * 1995-03-03 1997-09-25 Alcan Gmbh Metal winding tube
DE19823402C1 (en) * 1998-05-26 2000-02-17 Signode Bernpak Gmbh Material wraps, in particular wrapping material for strapping material for packages, and method for its production

Also Published As

Publication number Publication date
DE602004004374T2 (en) 2007-11-08
ES2279331T3 (en) 2007-08-16
SI1598297T1 (en) 2007-06-30
PL1598297T3 (en) 2007-06-29
EP1598297A1 (en) 2005-11-23
DE602004004374D1 (en) 2007-03-08
HRP20070105T3 (en) 2007-07-31

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