GB2186235A - Corrugated board - Google Patents
Corrugated board Download PDFInfo
- Publication number
- GB2186235A GB2186235A GB08703013A GB8703013A GB2186235A GB 2186235 A GB2186235 A GB 2186235A GB 08703013 A GB08703013 A GB 08703013A GB 8703013 A GB8703013 A GB 8703013A GB 2186235 A GB2186235 A GB 2186235A
- Authority
- GB
- United Kingdom
- Prior art keywords
- web
- fluting
- liner
- webs
- laminated
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003475 lamination Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 20
- 239000000123 paper Substances 0.000 claims description 18
- 239000002655 kraft paper Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 239000011087 paperboard Substances 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 1
- 238000010030 laminating Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 238000004078 waterproofing Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
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
- 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
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
Landscapes
- Laminated Bodies (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
Abstract
Corrugated board material is made from at least one laminated web (2, 15), the laminated web including a moisture-resistant layer which serves to bond the laminations of the laminated web together and has been formed from a water-based adhesive applied on the corrugator prior to the laminations (2, 15) being brought together with the fluting web (3). <IMAGE>
Description
SPECIFICATION
Improvements in and relating to corrugated board
This invention relates to an improved method of making corrugated board, to an improved corrugated board made by the method and to an improved corrugator.
Corrugated board is produced on a corrugator by laminating a corrugated fluting web of paper material to one or more lining webs of paper material. Various grades of corrugated board are known in the trade depending on the nature of the webs used, the pitch of the corrugations formed in the fluting material, the number of webs used and the treatment to which those webs are subjected on the corrugator. The webs are normally made from virgin wood fibre (known as "Kraft" paper) or from recycled fibre (known as "Test" paper) and for convenience in the following description only Kraft and Test paper will be referred to although it should be realised that for certain specialised applications other fibre-based products can be used for one or more of the webs and the invention should not be seen to be limited to these two types of paper web.
Both Kraft and Test papers are available in a range of different thicknesses or weights, these being classified by their gsm (grams per square metre). The thinnest weight of paper normally used for the fluting material is 112 gsm but other commonly used fluting material is 127 gsm and 150 gsm. The thinnest weight of paper normally used for the liner is a Test or Kraft paper of 125 gsm but Test and Kraft papers of 150 gsm are known and
Kraft papers of 200, 300, 336 and 400 gsm are available and are also commonly used.
The simplest corrugated board is a single faced single wall material having just one liner and one web of corrugated fluting material.
Using three webs, produces double faced single wall material, the corrugated fluting material being sandwiched between two liners.
Double faced double wall material is a laminate of five webs, two corrugated layers sandwiching a central web and two liners sandwiching the two corrugated layers. The pitch of the corrugations in the second and fourth layers can be the same or different.
Generally three pitches of corrugations are used, these being known-in increasing pitch-as "B", "C" or "A" flute material. It is also known to make double-faced triple wall material which consists of seven webs, three being of corrugated material (with two intermediate layers between them) and two outer liners.
The corrugator is a machine with reel stands for each of the webs used, preconditioners for web drawn from the reel stands (to heat and/or steam the web to give the required moisture content), two or more facer units (where the fluting web is corrugated, the tips of its flutes glued and the fluting and lining webs brought into contact) each producing a single faced single wall material, a conveyor for transporting the output from each facer unit to a combining stand where the component layers of the desired final board are brought and glued together, an oven in which the board is dried and an output section in which the board is optionally slit and scored and cut off into discrete board pieces of the required size for subsequent use.
The adhesive normally used to adhere the webs together on the corrugator is a waterbased starch adhesive which is a cheap, fastacting adhesive that can be made to form a strong bond if the webs have an appropriate moisture content as they leave the preconditioner and sufficient moisture content is driven off during travel through the oven.
Starch-based adhesive-bonded corrugated board suffers from a disadvantage of being very susceptible to moisture and unless action is taken to prevent it, such board will delaminate easily after only a few minutes soaking in water. Waterproofing of such starch-bonded board can be achieved by applying proprietary water-resistant material to one or more of the webs and one such proprietary material is an acrylic aqueous emulsion available from St.
Regis Packaging Ltd. under the Trade Name "Sealcote".
A corrugator can readily be modified to permit a waterproofing emulsion to be applied to one of the liners. All that is required is to pass the liner web (e.g. between the reel stand and preconditioner) below a reservoir of the emulsion prior to bonding it to the fluting material, and to use the passage through the oven of the corrugator to convert the emulsion layer thus applied into a water-proof coat. However, the presence of such a coat imposes restraints on the subsequent processing of the corrugated board since it is not so easy to print on as uncoated paper, nor will it so readily bond to the preferred glues used when subsequently making cartons from the board.
Specification GB-A-1296040 (Owens-lllinois
Inc.) discloses the laminating of two webs on the corrugator to form a moisture-barrier corrugated paperboard, but one of these webs has to be a specially prepared bag stock material precoated with a thermoplastic layer (e.g. polyethylene or polypropylene).
Specification GB-A-1481050 (Mitsubishi Petrochemical Co. Ltd.) discloses the production of a speciality corrugated paper product which does involve laminating webs on the corrugator but the web lamination involves the extrusion of a film of molten thermoplastics polymer and thus the incorporation in the corrugator of an extruder and its associated equipment.
Specification GB-A-2096052 (Lin Pac Con tainers Ltd.) also discloses a moisture-resistant corrugated paperboard and in this case a waterproof coating (which can be applied in aqueous emulsion form) provides the outer surface of a specially prepared laminated liner web which incorporates a second plastics layer (e.g. of polyethylene) that in the completed board is disposed between the liner web and the corrugated fluting material.
This invention relates to the production of moisture resistant corrugated paperboard in which a laminating step on at least one of the webs is undertaken on the corrugator so that an improved product can be produced using conventional web stock and without the need to provide plastics extrusion equipment on the corrugator.
What constitutes the invention in its method aspect can be taken from the following claim 1, in its board aspect from claim 9 and in its corrugator aspect from claim 13.
Of particular interest in the carrying out of this invention is a corrugated board material having a laminated liner web with a Test paper closest to the fluting web and an outerfacing Kraft paper.
The webs used to form the laminated web need not be of equai width since the invention can have particular benefits where reinforcement is provided only over part of the area of the board produced.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which
Figures 1a and 1b are a schematic side elevation of a prior art corrugator,
Figure 2 is a schematic side view of one part of the corrugator of Figure la showing the addition of further equipment required to produce a corrugator according to the invention, and
Figure 3 shows schematically how webs are combined in accordance with the method of the invention.
The corrugator shown in Figures la and ib comprises reel stands la, 1b, ic, id and 1e, respectively, for a first outer liner web 2, a first fluted medium web 3, an intermediate web 4, a second fluted medium web 5 and a second outer liner web 6. Each reel stand has an associated web conditioner unit 7a-7e, where the web is heated and/or steamed to prepare it for a subsequent bonding operation in a facer unit 8ab, 8cd or a double glue unit 8e.
Conveyors 9 and 10 bring the single faced corrugated material leaving the respective facer units 8ab and 8cd to the double glue unit 8e. An oven 11 receives the fully laminated material, a slitter/scorer 12 trims the edges off each side and slits and creases the board when and as required in the travelling direction. A cutoff unit 13 severs the board into sheets of the desired size.
Each reel stand is shown as supporting two reels of web, the second being a stand-by reel to permit splicing between the end of a finishing reel and the start of a new reel and thus allow continuous operation of the corrugator.
Figure 2 shows how an additional reel stand 14 can be interposed between the reel stand la and the preconditioner 7a. Web 15 from a reel on the reel stand 14 can be led through a trough 16 so that its upper face is contacted by an adhesive emulsion 17. A downstream doctor blade 18 controls the thickness of the layer applied. The webs 2 and 15 come together on the preconditioner 7a and form a two-ply laminate which is linked to the fluted medium web 3 in the facer unit 8ab. If Test paper (e.g. 125 gsm) is held on the reel stand 14 and Kraft paper (e.g. 186 gsm) is held on the reel stand 1a it is Kraft paper which forms the outermost layer of the corrugated board with an effective weight of 311 gsm.
If the trough 16 is filled with "Sealcote" the waterproofing properties of this material are imparted to the two-ply laminate 2/15 while still leaving pure Kraft paper on the exposed outer surface of the board, thus permitting normal printing and/or gluing operations to be carried out on the board during subsequent processing to form cartons.
With suitable modification of the corrugator shown in Figures 1 a and 1 b further reel stands and troughs can be located at one or more of the locations indicated by the arrows
A and B,or even the arrows C and D if twoply fluting material is required in the construction of the board.
FEFCO Compression (Test 50) and Burst (Test 4) tests on board made in accordance with the invention have indicated that although there is no dramatic improvement in board strength in the burst test when compared with a conventional board of comparable overall gsm rating, the use of a laminated facer web does give rise to a higher figure for the compression test indicating that a stronger board is produced. A flatcrush test (FEFCO Test 6) on board made in accordance with the invention indicated an acceptable performance at least as good as that obtained with grade equivalent conventional corrugated board material. A water absorption test (30 minute Cobb-FEFCO Test 7) indicated that the "Sealcote" layer was an effective barrier to moisture penetration.
Among the advantages of the invention may be mentioned the possibility afforded of reducing the number of different grades of web that need to be stocked, since a few different web grades held in stock will produce many different web grades when laminated in mixed pair combinations.
Claims (15)
1. A method of making, on a corrugator, a corrugated paper board material comprising adhesively attaching a liner web to a corrugated fluting web, characterised in that at least one of said webs is a laminated web formed from two webs held together on the corrugator upstream of the point of adhesive attachment of the liner web to the fluting web by a layer of water-based adhesive which, on drying, produces a moisture-resistant layer in the laminated web.
2. A method as claimed in claim 1, in which the two webs forming the laminated web are a Test paper web and a Kraft paper web.
3. A method as claimed in claim 2, in which the laminated web is the liner web and the
Test paper is attached to the fluting web.
4. A method as claimed in claim 1, in which the fluting web is sandwiched between two liner webs, each liner web being of laminated construction.
5. A method as claimed in claim 4, in which at least one liner web comprises a Test paper web adhered to the fluting web and a Kraft paper web bonded by the moisture-resistant layer to the Test paper web.
6. A method as claimed in any preceding claim, in which the water-based adhesive is an acrylic aqueous emulsion.
7. A method as claimed in any preceding claim, in which the two webs forming the or each laminated web are of substantially the same width.
8. A method of making a corrugated paper board material substantially as hereinbefore described with reference to the accompanying drawings.
9. A corrugated paper board comprising a corrugated fluting web adhesively attached to at least one liner web, one or more said webs being of laminated construction and including a moisture-resistant layer between the laminations, characterised in that the moistureresistant layer is formed from a dried water-based adhesive.
10. A corrugated paper board as claimed in claim 9, in which the liner web is laminated and the moisture-resistant layer divides a Test paper web adhered to the fluting web and a
Kraft paper web forming an outer surface of the board.
11. A corrugated paper board as claimed in claim 9 or claim 10, in which the moistureresistant layer is formed from a dried acrylic aqueous emulsion.
12. A corrugated paper board substantially as hereinbefore described with reference to
Figure 3 of the accompanying drawings.
13. A corrugator for making corrugated board material from a fluting web adhered to a liner web which comprises a respective reel stand for a roll of each of the liner web and the fluting web, a facer unit where the liner web is adhered to corrugations of the fluting web and an oven where the board material is heated to improve the adhesive bond between the webs, characterised by the provision of a) an additional reel stand for an additional web to make a laminated web with one of said fluting or liner webs, b) means to apply a layer of water-based adhesive between said fluting or liner web and said additional web, and c) means to bring said fluting or liner web and said additional web together, upstream of the facer unit, so that it is a laminated web that passes through the facer unit with the other of said liner or fluting webs, said adhesive used in the laminated web being chosen to form a moisture-resistant coating when the board has passed through the oven.
14. A corrugator as claimed in claim 13, in which the means to apply the layer of adhesive between the two webs which form the laminated web is a trough through which one of the said two webs passes.
15. A corrugator substantially as hereinbefore described with reference to Figure 1 substantially as modified by Figure 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868603301A GB8603301D0 (en) | 1986-02-11 | 1986-02-11 | Corrugated board |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8703013D0 GB8703013D0 (en) | 1987-03-18 |
| GB2186235A true GB2186235A (en) | 1987-08-12 |
| GB2186235B GB2186235B (en) | 1989-11-01 |
Family
ID=10592841
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868603301A Pending GB8603301D0 (en) | 1986-02-11 | 1986-02-11 | Corrugated board |
| GB8703013A Expired GB2186235B (en) | 1986-02-11 | 1987-02-10 | Improvements in and relating to corrugated board |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868603301A Pending GB8603301D0 (en) | 1986-02-11 | 1986-02-11 | Corrugated board |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8603301D0 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995009083A1 (en) * | 1993-09-30 | 1995-04-06 | The University Of British Columbia | Corrugated paperboard package systems with gas-permeable plastic membranes for modified atmosphere packaging of fresh fruits and vegetables and cut flowers |
| CN1121535C (en) * | 1997-10-30 | 2003-09-17 | 刘小晶 | Method for prodn. of kraft liner board |
| EP2121477A1 (en) * | 2006-12-19 | 2009-11-25 | Loong Keng Lim | Packaging systems for the control of relative humidity of fresh fruits, vegetables and flowers with simultaneous regulation of carbon dioxide and oxygen |
| US7635157B2 (en) * | 2007-09-11 | 2009-12-22 | GM Global Technology Operation, INC | Vehicle hood assembly with rippled cushion support |
| US7690720B2 (en) * | 2008-01-31 | 2010-04-06 | Gm Global Technology Operations, Inc. | Energy absorbing vehicle hood assembly with asymmetric sandwich inner structure |
| US7735908B2 (en) * | 2007-07-24 | 2010-06-15 | Gm Global Technology Operations, Inc. | Vehicle hood with sandwich inner structure |
| CN104999819A (en) * | 2015-07-13 | 2015-10-28 | 浙江万峰包装有限公司 | High-efficiency gravure printing film laminating technology |
| WO2018205883A1 (en) * | 2017-05-10 | 2018-11-15 | 青岛美达智能科技有限公司 | Facial tissue and corrugated paper automatic aligning device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1296040A (en) * | 1968-12-31 | 1972-11-15 |
-
1986
- 1986-02-11 GB GB868603301A patent/GB8603301D0/en active Pending
-
1987
- 1987-02-10 GB GB8703013A patent/GB2186235B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1296040A (en) * | 1968-12-31 | 1972-11-15 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995009083A1 (en) * | 1993-09-30 | 1995-04-06 | The University Of British Columbia | Corrugated paperboard package systems with gas-permeable plastic membranes for modified atmosphere packaging of fresh fruits and vegetables and cut flowers |
| CN1121535C (en) * | 1997-10-30 | 2003-09-17 | 刘小晶 | Method for prodn. of kraft liner board |
| EP2121477A1 (en) * | 2006-12-19 | 2009-11-25 | Loong Keng Lim | Packaging systems for the control of relative humidity of fresh fruits, vegetables and flowers with simultaneous regulation of carbon dioxide and oxygen |
| EP2121477A4 (en) * | 2006-12-19 | 2010-09-08 | Loong Keng Lim | Packaging systems for the control of relative humidity of fresh fruits, vegetables and flowers with simultaneous regulation of carbon dioxide and oxygen |
| US7735908B2 (en) * | 2007-07-24 | 2010-06-15 | Gm Global Technology Operations, Inc. | Vehicle hood with sandwich inner structure |
| US7635157B2 (en) * | 2007-09-11 | 2009-12-22 | GM Global Technology Operation, INC | Vehicle hood assembly with rippled cushion support |
| US7690720B2 (en) * | 2008-01-31 | 2010-04-06 | Gm Global Technology Operations, Inc. | Energy absorbing vehicle hood assembly with asymmetric sandwich inner structure |
| CN104999819A (en) * | 2015-07-13 | 2015-10-28 | 浙江万峰包装有限公司 | High-efficiency gravure printing film laminating technology |
| WO2018205883A1 (en) * | 2017-05-10 | 2018-11-15 | 青岛美达智能科技有限公司 | Facial tissue and corrugated paper automatic aligning device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8703013D0 (en) | 1987-03-18 |
| GB2186235B (en) | 1989-11-01 |
| GB8603301D0 (en) | 1986-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |