EP0476040B1 - Embossed wrapping paper - Google Patents

Embossed wrapping paper Download PDF

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Publication number
EP0476040B1
EP0476040B1 EP90909795A EP90909795A EP0476040B1 EP 0476040 B1 EP0476040 B1 EP 0476040B1 EP 90909795 A EP90909795 A EP 90909795A EP 90909795 A EP90909795 A EP 90909795A EP 0476040 B1 EP0476040 B1 EP 0476040B1
Authority
EP
European Patent Office
Prior art keywords
paper
figures
embossed
distance
lines
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
EP90909795A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0476040A1 (en
Inventor
Roland Evert Lilja
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.)
ASSIDOMAEN KRAFT PRODUCTS AB
Original Assignee
Mo och Domsjo 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
Application filed by Mo och Domsjo AB filed Critical Mo och Domsjo AB
Publication of EP0476040A1 publication Critical patent/EP0476040A1/en
Application granted granted Critical
Publication of EP0476040B1 publication Critical patent/EP0476040B1/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
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/005—Anti-slip or anti-skid bags, e.g. bags provided with anti-slip coating, ribs, strips

Definitions

  • embossing patterns that hitherto have been used on sacks, have meant that the sack material has shown bosses and, possibly, even recesses, relative to the original plane of the material. The thought has been that, by the piling of filled sacks, the bosses will be locked by the parts not embossed (alt. recesses) in the sack lying closest underneath.
  • the pattern, according to the above, will even obtain a friction increasing effect on wrapping paper when goods, that have been wrapped in the paper, are piled one above the other.
  • wrapping paper is meant a paper, where the main part of the fibre material (e.g. ⁇ 70%, w/w) usually originates from a long-fibred wood, such as spruce or pine.
  • the fibre material is usually sulphate pulp and may be bleached or unbleached. Recycled fibres may be present in a greater or lesser extent.
  • Several of the kinds of paper that are referred to, e.g. sack paper may well be clopacked (creped). Normally, fillers are not present in the paper, and if they to some degree do, the amount usually is ⁇ 10% (w/w), such as ⁇ 5% (w/w).
  • tensile energy absorption index may be mentioned, which, in the longitudinal direction of the paper ought to be ⁇ 0.4 kJ/kg, and in its cross direction ⁇ 0.3 kJ/kg.
  • the elongation in the longitudinal direction usually is ⁇ 1% (in case of wrapping paper of a somewhat better quality ⁇ 2%) and in the cross direction ⁇ 2.0% (appreciably ⁇ 3.5%).
  • 7 kJ/kg, 6 kJ/kg, 20% respecively 15% are valid.
  • High values of tensile energy absorption index and elongation indicate high-qualitative products.
  • longitudinal direction the machine direction of the paper is current, which, in most cases, also is the main direction of the fibres.
  • Cross direction is perpendicular to longitudinal direction.
  • the figures of the embossing patterns may be straight-lined triangles (triangles), quadrangles, pentagons etc., whereby quadrangles are preferred, and especially of the kind in which there are sides parallel in pairs, like in parallelograms, for example of the kind equilateral.
  • the pattern figures according to the invention show an even-numbered symmetry axis, which, at the most, is four-numbered. In one and the same embossing pattern it is preferred, that all the figures of the pattern are identical, even if, for some patterns, may occur, that an improved friction paper to paper is achieved if 2, 3, 4 or more different kinds of figures exist.
  • the paper according to the invention may, along one or both of its longitudinal sides, have an outer zone lacking the evenly distributed embossing figures.
  • the figures in these zones may be less distinct because they are not raised as much out of the original paper plane as the more central parts, or because the angle between figure plane and the connection surface to the original paper plane is greater than 90°. Outer zones of this kind are 1-2 dm, if they exist in the wrapping paper.
  • Normal pattern frequency usually is below 500, such as below 200 identical figures/dm2 As an example, 10-100 may be mentioned, such as 20-60 identical figures/dm2.
  • the total pattern area is ⁇ 40% and usually ⁇ 0.5% (preferably above 1%) of the total pattern area. It has been shown, that very good improvements in the friction paper to paper may be achieved, if the total figure area is below 30%, such as below 20% or below 10% of the total pattern area.
  • improved friction properties is meant, that the improvement is ⁇ 1%, such as ⁇ 5%, relative to corresponding unembossed paper (the friction coefficient for paper to paper measured in any direction). The way of measuring is given in the experimental part.
  • the orientation of the pattern figures shall preferably be of that kind, that the machine direction of the paper divides an angle in the figures in substantially two (+/- 10°) equally large angles. If an acute angle exists in the figures it is preferably such a one that is divided.
  • the figures consist of parallelogram. These are shown in figure A and can be defined by the help of a checked pattern, which arises if a first number of parallel, straight lines l1, l2, l3....l n are intersected by a second number of parallel, straight lines l'1, l'2, l'3...l' n at an angle ⁇ .
  • the lines extend over the width of the paper.
  • n and n are integers which may be even or uneven and are always greater than 10. The exact number of lines is determined by the distance between them, their slope in relation to the width and the width of the sack paper.
  • the perpendicular distance between the lines in one group are alternating, and is
  • the distances a, b, c and d ⁇ 5 cm, preferably ⁇ 3 cm, and that a ⁇ b, and c ⁇ d.
  • the figures of the pattern are defined as the whole checked pattern minus the area between lines present at the distances b and d from each other.
  • the angle ⁇ fulfills the condition 10° ⁇ ⁇ ⁇ 170°, such as 10° ⁇ ⁇ ⁇ 90° or 90° ⁇ ⁇ ⁇ 170°.
  • the lines l1, l2, l3 together have a positive slope and that the lines l'1, l'2, l'3 ...l n have a negative slope compared with the machine direction of the paper.
  • the angle ⁇ is readily divided in half by the machine direction.
  • FIGS 1-6 show examples of patterns in question seen from above.
  • the machine direction of the papers is indicated with a double-arrow [ ⁇ -->].
  • the angle ⁇ is 30° and is divided in half by the machine direction.
  • the symmetry axis of the pattern is two-numbered.
  • the figure frequency is 48 pieces/dm2.
  • the angle ⁇ is 90° and is divided by the machine direction in one angle which is 0° and one which is 90°.
  • the symmetry axis is four-numbered.
  • the figure frequency is 49 pieces/dm2.
  • Figure 5 shows a paper whose pattern is rather like the one in the preceding figure, but whith smaller squares and greater figure frequency.
  • Figure 6 shows a paper according to the invention where a ⁇ c ⁇ d ⁇ b.
  • the angle ⁇ is 90° and is divided in half by the machine direction.
  • the symmetry axis of the figures is two-numbered.
  • the figure frequency is 32 pieces/dm2.
  • One aspect of the invention is a method for manufacturing a wrapping paper, preferably sack paper, containing the pattern defined above, by way of embossing a web of sack paper.
  • the paper web as such is manufactured in a way for wrapping paper known per se , and means in the preferred embodiments of the invention a clopacking stage.
  • the embossing is carried out by allowing the paper web, after a possibly clopacking, pass through a roll nip, where one of the rolls is softer than the other (pressing- respectively embossing roll).
  • the harder of the rolls has an envelope surface which suitably is made of metal (e.g. steel or cast iron) or another hard material.
  • Its envelope surface shows for the wrapping paper of the invention said pattern provided with evenly distributed, raised and identical figures with differences which are due to that the envelope surface not is made of paper.
  • the interval which usually is suitable for the roll, therefore is 0.06-0.45 mm instead of 0.05-0.40 mm that is applied for the paper.
  • the roll may well be constructed so it can be heated, in order that the paper will dry as fast as possible after the embossing. The paper will partly then more easily lift from the roll and the embossing pattern will partly be freezed more effectively, which, at the same time, makes it more stable. The best, therefore, is if the roll is constructed in a usual way as a drying cylinder in a paper machine, i.e. hollow with an inlet for hot steam (approx.
  • the roll is suitably made from a roll provided with a smooth envelope surface by brooching out recesses corresponding to the surface between lines with the distances b and d between each other (see the above). The depth of the recesses lies in the above mentioned interval.
  • the pressing roll is made of elastic material which permits that the figures of the embossing roll can be completely impacted in the material when the rolls are pressed against each other.
  • An excellent material is rubber, e.g. hard rubber.
  • the pressing roll is suitably cambered to permit an even line pressure along itself during the embossing.
  • a suitable embossing pressure (kp/cm2 depends on factors such as the raise of the figures out of the envelope surface, the hardness of the pressing roll, the thickness of the paper, choice of fibre material, speed in the head box etc.
  • the embossing pressure is 1-10 kp/cm2.
  • the embossing most suitably should be carried out at a dry solids content of 60-80%, preferably 65-70% (w/w). After the embossing the paper is dried to a dry solids content of above 90% (w/w).
  • One aspect of the invention is a sack, which surface wholly or partially shows the embossing pattern mentioned above.
  • the sack material may wholly or partially be made of plastic or paper.
  • the pattern consists of a plurality of out of the surface of the sack raised, delimited patterns which are identical. Characterizing features are;
  • the same is valid for the sack as for the embossing pattern of the paper with regard to that the embossed surface does not need to be made of paper.
  • the embossed surface does not have any machine direction
  • with the machine direction of the paper is meant the height direction of the sack. If only parts of the sack surface are covered with the embossing pattern, it is suitably on the upper or lower side of the sack, i.e. those sides of the sack that by piling lies against other sacks.
  • the sack according to the invention is constructed in a manner known for sacks per se , in which the sack material may consist of one to six different layers, so called sheets, in which the outermost sheet, according to the invention, preferably is made of paper.
  • the embossing pattern is situated on the outer layer or, as an alternative, is glued on in the form of embossed sheet of plastic or paper.
  • sacks By the manufacturing of sacks, one is starting from one or more rolls of web formed sack material, which are just as broad as the circumference of the sack including that part (for example paste joints) which shall be used to form the web material into a longitudinal tube.
  • a roll For each sheet a roll is used, by which that web material which shall be in the outside of the sack (outer web) shall be embossed with any of the patterns given above, or if it is not, it is moistened, embossed and dried in connection to the unwinding.
  • the different webs of material are stored, by the unwinding, continuously one upon the other, whereafter the in that way obtained, possibly multiple sheeted web material, continuously is formed and joined together (pasted together) into a tube.
  • Sack paper taken from the paper machine at a dry solids content of approx. 65%, has been embossed in a laboratory press under conditions intended, as far as possible, to be equal to embossing in the paper machine.
  • the tensile strength is scarcely affected by the embossing while the extension seems to decrease somewhat, which results in a tensile energy absorption decrease of up to 20% in the longitudinal, and up to 16% in the cross direction.
  • the air resistance increases up to 12 units, from 29 to 41 s.
  • the friction increases up to 0.11 units from 0.63 to 0.74.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Wrappers (AREA)
  • Paper (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Medicinal Preparation (AREA)
  • Sanitary Thin Papers (AREA)
  • Materials For Medical Uses (AREA)
  • Buffer Packaging (AREA)
EP90909795A 1989-06-09 1990-05-31 Embossed wrapping paper Expired - Lifetime EP0476040B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902083A SE502689C2 (sv) 1989-06-09 1989-06-09 Präglat förpackningspapper vars präglingsmönster uppvisar en mångfald upphöjda, avgränsade, identiska, figurer
SE8902083 1989-06-09

Publications (2)

Publication Number Publication Date
EP0476040A1 EP0476040A1 (en) 1992-03-25
EP0476040B1 true EP0476040B1 (en) 1994-03-02

Family

ID=20376227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909795A Expired - Lifetime EP0476040B1 (en) 1989-06-09 1990-05-31 Embossed wrapping paper

Country Status (10)

Country Link
EP (1) EP0476040B1 (no)
AT (1) ATE102152T1 (no)
DE (1) DE69007105T2 (no)
DK (1) DK0476040T3 (no)
ES (1) ES2049980T3 (no)
FI (1) FI98142C (no)
IE (1) IE63811B1 (no)
NO (1) NO178145C (no)
SE (1) SE502689C2 (no)
WO (1) WO1990014998A1 (no)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6347480B1 (en) * 1997-07-07 2002-02-19 Southpac Trust International, Inc. Method for wrapping a floral grouping with a sheet of material constructed of paper and having printed and embossed patterns thereon
CA2164120A1 (en) * 1993-06-28 1995-01-05 Jose Porchia Flexible thermoplastic containers having a visual pattern thereon
SE9904298D0 (sv) * 1999-11-26 1999-11-26 Assidomaen Ab Embossment Pattern
SE523870C2 (sv) * 2001-02-12 2004-05-25 Korsnaes Ab Präglat högflexibelt papper och ett förfarande för framställning därav
DE102014006815A1 (de) * 2014-05-08 2015-11-12 Mondi Ag Papiersack und Verfahren zur Herstellung eines Papiersacks
US11440305B2 (en) 2017-06-26 2022-09-13 David Paul Goodrich Embossed paper in combination with paper cushioning for shipping envelopes
USD983047S1 (en) 2021-05-19 2023-04-11 S. C. Johnson & Son, Inc. Storage bag

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2917223A (en) * 1955-10-19 1959-12-15 Cromwell Paper Co Non-slip bag
US3495761A (en) * 1968-04-16 1970-02-17 Hudson Pulp & Paper Corp Embossed kraft paper and paper bags made therefrom
US3904465A (en) * 1970-02-20 1975-09-09 Mobil Oil Corp Process and apparatus for the manufacture of embossed film laminations
DE3437414C2 (de) * 1984-10-12 1994-08-04 Nordenia Verpackung Gmbh Vorrichtung zur Bearbeitung von als Folienbahn vorliegenden Kunststoffolien sowie bearbeitete Kunststoffolie

Also Published As

Publication number Publication date
NO914614D0 (no) 1991-11-25
NO178145B (no) 1995-10-23
SE8902083D0 (sv) 1989-06-09
FI915767A0 (fi) 1991-12-05
FI98142C (fi) 1997-04-25
FI98142B (fi) 1997-01-15
SE8902083L (sv) 1990-12-10
ES2049980T3 (es) 1994-05-01
IE902068L (en) 1990-12-09
SE502689C2 (sv) 1995-12-11
EP0476040A1 (en) 1992-03-25
DE69007105T2 (de) 1994-09-08
ATE102152T1 (de) 1994-03-15
DK0476040T3 (da) 1994-03-28
NO178145C (no) 1996-01-31
WO1990014998A1 (en) 1990-12-13
DE69007105D1 (de) 1994-04-07
NO914614L (no) 1991-11-25
IE63811B1 (en) 1995-06-14

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