WO1999020839A1 - Corrugated cardboard formed by dry laying - Google Patents

Corrugated cardboard formed by dry laying Download PDF

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Publication number
WO1999020839A1
WO1999020839A1 PCT/FI1998/000809 FI9800809W WO9920839A1 WO 1999020839 A1 WO1999020839 A1 WO 1999020839A1 FI 9800809 W FI9800809 W FI 9800809W WO 9920839 A1 WO9920839 A1 WO 9920839A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
corrugated
corrugated cardboard
dry laying
dry
Prior art date
Application number
PCT/FI1998/000809
Other languages
Finnish (fi)
French (fr)
Inventor
Arto Kovalainen
Original Assignee
Walkisoft Finland 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 Walkisoft Finland Oy filed Critical Walkisoft Finland Oy
Publication of WO1999020839A1 publication Critical patent/WO1999020839A1/en

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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • 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
    • B32B29/08—Corrugated paper or 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/42—Multi-ply comprising dry-laid paper
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/758—Odour absorbent
    • 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
    • B32B2317/127—Corrugated cardboard
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped

Definitions

  • This invention relates to a corrugated cardboard, which contains at least one smooth
  • corrugated cardboard is as material for various packaging containers.
  • corrugated cardboard is used as a packaging material, its primary purpose is to
  • the intention of the present invention is to provide a corrugated cardboard in which
  • This layer formed by dry laying can be either the corrugated layer or equally the smooth
  • a layer formed by dry laying can contain
  • fibres or particles absorbing liquid or odours The fibres of a layer formed by dry
  • laying can also be dyed to give a desired tone of colour to the layer in question.
  • layer formed by dry laying can also contain fibres or particles emitting odours.
  • a layer formed by dry laying can be made to contain fibres or particles
  • a corrugated cardboard according to the invention can further contain at least one
  • barrier layer on at least one surface of at least one cardboard layer.
  • thermoplastic layer is typically a gas- and/or liquid tight thermoplastic layer attached to the cardboard
  • FIG. 1 shows a first example embodiment of a corrugated cardboard according to the
  • Fig. 2 shows a second example embodiment of a corrugated cardboard according to
  • cardboard according to the invention is shown. It contains a smooth cardboard layer
  • corrugated layer 2 This corrugated
  • layer 2 is produced by dry laying, i.e., by so-called dry-forming technique. This
  • desired layer thickness requires, when one layer after another is formed on the same
  • the layer formed by dry laying can be composed of primarily wood fibres which are preferably relatively long-fibre
  • thermobonding mechanical pulp and of plastic fibres which can be of any suitable thermobonding
  • the web is bonded with heat in, for instance, a flow-
  • dry laying must, as a rule, be relatively rigid. This is achieved by appropriately
  • agents absorbing odours can be added to the web either in
  • properties of a packaging material can be varied according to the requirements of die
  • Figure 2 of the attached drawing shows another example embodiment of a
  • corrugated cardboard according to the invention.
  • layer 20 of cardboard is
  • corrugated and the smooth layer 10 attached to it is a layer formed by dry laying.
  • the layer formed by dry laying can be given the desired properties
  • a corrugated cardboard according to die invention can also be made to contain
  • barrier layers are attached to a cardboard
  • thermoplastic gas and/or liquid tightness and typically made of thermoplastic can be located on
  • the barrier layer can naturally be located between these cardboard layers.
  • a corrugated cardboard can contain
  • cardboard resembles, for example, conventional so-called two-sided corrugated
  • layer when made of cardboard, can be made of one or several webs, in which case a
  • barrier layer or several barrier layers, if such exist, can be located on any surface of
  • any of the cardboard layers There can also be several layers formed by dry laying so
  • corrugated layer is added a corrugated layer. More than one corrugated layers can, if

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

The invention relates to a corrugated cardboard which contains at least one smooth layer (1) and at least one corrugated layer (2), at least one of the layers being a cardboard layer (1). According to the invention at least one of the layers is a layer (2) formed by dry laying.

Description

Corrugated cardboard formed by dry laying
Field of the technology
This invention relates to a corrugated cardboard, which contains at least one smooth
layer and at least one corrugated layer, at least one the layers being a cardboard
layer.
Corrugated cardboard is known to have numerous applications. By altering the
number and thickness of layers as well as the shape of corrugation of the corrugated
layer, it is possible to achieve corrugated cardboard with very varying properties and
therefore suitable for very varying applications, although particularly well suited
corrugated cardboard is as material for various packaging containers. When
corrugated cardboard is used as a packaging material, its primary purpose is to
protect the packaged products against external impact and thus provide mechanical
protection to the product to be packaged.
Summary of the invention
The intention of the present invention is to provide a corrugated cardboard in which
the properties of corrugated cardboard have been successfully expanded in a simple
and effective manner. This is achieved in a corrugated cardboard according to the
invention by having a layer formed by dry laying as at least one of its layers. This layer formed by dry laying can be either the corrugated layer or equally the smooth
layer of corrugated cardboard. Because of its manufacturing technique, a layer
formed by dry laying can be given various properties different from the properties of
conventional corrugated cardboard. Thus, a layer formed by dry laying can contain
fibres or particles absorbing liquid or odours. The fibres of a layer formed by dry
laying can also be dyed to give a desired tone of colour to the layer in question. A
layer formed by dry laying can also contain fibres or particles emitting odours.
Furthermore, a layer formed by dry laying can be made to contain fibres or particles
conducting electricity or insulating from electricity. Thus the properties of a layer
formed by dry laying can be very widely varied accord ng to the desired application
in each case.
A corrugated cardboard according to the invention can further contain at least one
barrier layer on at least one surface of at least one cardboard layer. The barrier layer
is typically a gas- and/or liquid tight thermoplastic layer attached to the cardboard
layer either by extrusion or lamination.
List of figures
In the following, a corrugated cardboard according to the invention is described in
more detail with reference to the attached drawing in which Fig. 1 shows a first example embodiment of a corrugated cardboard according to the
invention, and
Fig. 2 shows a second example embodiment of a corrugated cardboard according to
the invention.
Detailed description of the invention
In Fig. 1 of the attached drawing, a first example embodiment of a corrugated
cardboard according to the invention is shown. It contains a smooth cardboard layer
1 and, attached to it conventionally by glueing, a corrugated layer 2. This corrugated
layer 2 is produced by dry laying, i.e., by so-called dry-forming technique. This
means that a web is formed on the wire of a dry laying machine with the help of one
or several forming boxes, i.e. formers. Into the formers reaching transversely across
the entire width of the wire, a mixture of air and fibre is blown which is mixed and
screened to form an even material layer on the wire moving underneath according to
the known technique. There can be as many formers placed above the wire as the
desired layer thickness requires, when one layer after another is formed on the same
production line until the desired thickness is achieved. From different formers
different fibre mixtures can be blown to the web to provide the web with the desired
properties.
In a corrugated cardboard according to the invention, the layer formed by dry laying can be composed of primarily wood fibres which are preferably relatively long-fibre
mechanical pulp and of plastic fibres which can be of any suitable thermobonding
quality. After the forming step, the web is bonded with heat in, for instance, a flow-
through oven.
The properties of a layer achieved by dry laying used in a corrugated cardboard
according to the invention can vary significantly according to the intended
application of the corrugated cardboard in each case. In the embodiment according
to Fig. 1 in which the layer formed by dry laying is corrugated, the layer formed by
dry laying must, as a rule, be relatively rigid. This is achieved by appropriately
selecting the web fibres and the fibre composition as well as the bonding agent,
which can be either fibrous or liquid. A relatively rigid web is required to allow the
web to be corrugated into a corrugated web 2 shown in Fig. 1 so that it maintains
this corrugated shape after the corrugation. In corrugation, the originally relatively
rigid web softens preferably in other respects as well making it very suitable for use
in various packaging and softening purposes.
As an example, a layer formed by dry laying suitable for forming the corrugated
layer of a corrugated cardboard according to the invention can be shown to have the
following properties: basis weight 70 g/m^, thickness when four layers 2.6 mm, dry
tensile strength in machine direction 0.40 kN/m and in cross direction 0.32 kN/m, dry elongation in machine direction 10 % and in cross direction 8 %, wet tensile
strength in machine direction 0.20 kN/m and in cross direction 0.18 kN/m, and
absorption 520 g/m^. The rigidity of this type of a layer defined as bending length is
on average 61 mm when defined with the method EDANA 50.3-93 with which the
bending of a rectangular material strip (25 ± 1 mm x 250 ± 1 mm) caused by its own
weight to a certain angle (7.1°) is defined.
When using organic fibres, such as wood fibres, as material for a dry laid layer, the
web will naturally absorb liquids efficiently and liquids are also spread in it
efficiently. This property can obviously be encouraged by adding to the dry laid
product other absorbent materials, such as superabsorbents either in fibrous or
particle form. Similarly agents absorbing odours can be added to the web either in
fibrous or particle form. Furthermore, it is possible to modify the electrical
properties of the web by adding to it either fibres or particles conducting electricity
or alternatively fibres or particles insulating from electricity. This way the electrical
properties of a packaging material can be varied according to the requirements of die
intended application in each case.
In addition to that a layer formed by dry laying can be given the different properties
described above, it can also be dyed as desired by forming it from dyed fibres.
Consequently the web becomes dyed throughout and the dyeing will not affect the web properties in other ways. Similarly the heat insulating properties of a web can
be varied according to the above methods.
Figure 2 of the attached drawing shows another example embodiment of a
corrugated cardboard according to the invention. Here, layer 20 of cardboard is
corrugated and the smooth layer 10 attached to it is a layer formed by dry laying. In
this embodiment, the layer formed by dry laying can be given the desired properties
exactly in ways described above. In this embodiment, however, the dry laid layer
does not need to be particularly rigid since no corrugation is required.
A corrugated cardboard according to die invention can also be made to contain
various barrier layers. Preferably tiiese barrier layers are attached to a cardboard
layer which in the embodiment of Fig. 1 is marked with a reference number 1 and in
the embodiment of Fig. 2 with a reference number 20. Such a barrier layer creating
gas and/or liquid tightness and typically made of thermoplastic can be located on
either of the surfaces of the cardboard layer or also on both of its surfaces. If there
are several cardboard layers, the barrier layer can naturally be located between these
layers, as well.
Above, a corrugated cardboard according to the invention is described with the help
of merely two example embodiments. It should be realized that to these embodiments various changes can be made without deviating from the scope of
protection defined by the attached claims. Thus, a corrugated cardboard can contain
several corrugated layers as well as several smooth layers so that the corrugated
cardboard resembles, for example, conventional so-called two-sided corrugated
cardboard in which the corrugated layer is located between two smooth layers.
Furthermore, as already mentioned above, either the corrugated layer or the smooth
layer, when made of cardboard, can be made of one or several webs, in which case a
barrier layer or several barrier layers, if such exist, can be located on any surface of
any of the cardboard layers. There can also be several layers formed by dry laying so
that such a layer formed by dry laying and corrugated is located on both sides of one
smooth layer, or also so that on one or both free surfaces of two-sided corrugated
cardboard is added a corrugated layer. More than one corrugated layers can, if
desired, be added as various combinations into a corrugated cardboard according to
the invention with a method known from conventional corrugated cardboard
technique. Naturally, the shape of corrugation used can also be varied using the
known method.

Claims

Claims
1. A corrugated cardboard, which contains at least one smooth layer (1; 10) and at
least one corrugated layer (2; 20), at least one of the layers being a cardboard layer
(1; 20), characterized in that at least one of said layers is a layer (2; 10) formed by
dry laying.
2. A corrugated cardboard according to claim 1, characterized in that the layer (2)
formed by dry laying is a corrugated layer.
3. A corrugated layer according to claim 1, characterized in that the layer (10)
formed by dry laying is a smooth layer.
4. A corrugated layer according to one of the claims 1 - 3, characterized in that the
layer (2; 10) formed by dry laying contains fibres or particles absorbing liquid.
5. A corrugated cardboard according to one of the claims 1- 4, characterized in that
the layer (2; 10) formed by dry laying contains dyed fibres to give a desired tone of
colour to the layer in question.
6. A corrugated cardboard according to one of the claims 1 - 5, characterized in
that the layer (2; 10) formed by dry laying contains fibres or particles absorbing odours.
7. A corrugated cardboard according to one of the claims 1 - 5, characterized in
that the layer (2; 10) formed by dry laying contains fibres or particles emitting
odours.
8. A corrugated cardboard according to one of the claims 1 - 7, characterized in
that the layer (2; 10) formed by dry laying contains fibres or particles insulating
from electricity.
9. A corrugated cardboard according to one of the claims 1 - 7, characterized in
that the layer (2; 10) formed by dry laying contains fibres or particles conducting
electricity.
10. A corrugated cardboard according to one of the above claims 1 - 9,
characterized in that it further contains at least one barrier layer on at least one of
the surfaces of at least one cardboard layer (2; 10).
PCT/FI1998/000809 1997-10-22 1998-10-19 Corrugated cardboard formed by dry laying WO1999020839A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI974025 1997-10-22
FI974025A FI974025A (en) 1997-10-22 1997-10-22 corrugated

Publications (1)

Publication Number Publication Date
WO1999020839A1 true WO1999020839A1 (en) 1999-04-29

Family

ID=8549777

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000809 WO1999020839A1 (en) 1997-10-22 1998-10-19 Corrugated cardboard formed by dry laying

Country Status (2)

Country Link
FI (1) FI974025A (en)
WO (1) WO1999020839A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000035674A1 (en) * 1998-12-14 2000-06-22 Stora Enso Oyj Paperboard-based material
WO2003004258A1 (en) * 2001-07-05 2003-01-16 M-Real Oyj Method for producing cardboard and cardboard product

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773587A (en) * 1971-07-01 1973-11-20 Domtar Ltd Manufacture of corrugated board
GB1595905A (en) * 1977-04-29 1981-08-19 Kroyer St Annes S Ltd Karl Process for making a cellulosic product
EP0255654A1 (en) * 1986-08-06 1988-02-10 MIRA LANZA S.p.a. Method of dry-forming sheet products containing super-absorbent polymers mixed with cellulosic fibres, and absorbent products thus obtained
US5310593A (en) * 1990-10-31 1994-05-10 Osaka Gas Company Limited Adsorbent
US5637377A (en) * 1995-05-31 1997-06-10 Sunclipse, Inc. Protective containerboard for electrostatic discharge sensitive devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773587A (en) * 1971-07-01 1973-11-20 Domtar Ltd Manufacture of corrugated board
GB1595905A (en) * 1977-04-29 1981-08-19 Kroyer St Annes S Ltd Karl Process for making a cellulosic product
EP0255654A1 (en) * 1986-08-06 1988-02-10 MIRA LANZA S.p.a. Method of dry-forming sheet products containing super-absorbent polymers mixed with cellulosic fibres, and absorbent products thus obtained
US5310593A (en) * 1990-10-31 1994-05-10 Osaka Gas Company Limited Adsorbent
US5637377A (en) * 1995-05-31 1997-06-10 Sunclipse, Inc. Protective containerboard for electrostatic discharge sensitive devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000035674A1 (en) * 1998-12-14 2000-06-22 Stora Enso Oyj Paperboard-based material
WO2003004258A1 (en) * 2001-07-05 2003-01-16 M-Real Oyj Method for producing cardboard and cardboard product

Also Published As

Publication number Publication date
FI974025A (en) 1999-04-23
FI974025A0 (en) 1997-10-22

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