US1765860A - Liner board or paper - Google Patents
Liner board or paper Download PDFInfo
- Publication number
- US1765860A US1765860A US608579A US60857922A US1765860A US 1765860 A US1765860 A US 1765860A US 608579 A US608579 A US 608579A US 60857922 A US60857922 A US 60857922A US 1765860 A US1765860 A US 1765860A
- Authority
- US
- United States
- Prior art keywords
- paper
- web
- layer
- sheet
- pulverulent
- 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
Links
- 239000000463 material Substances 0.000 description 28
- 239000010410 layer Substances 0.000 description 26
- 239000000123 paper Substances 0.000 description 18
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 12
- 239000002131 composite material Substances 0.000 description 10
- 235000013312 flour Nutrition 0.000 description 10
- 239000002023 wood Substances 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000001464 adherent effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 5
- 238000010009 beating Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229940037003 alum Drugs 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000007900 aqueous suspension Substances 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
Classifications
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/06—Sulfite or bisulfite pulp
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- 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
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
Definitions
- the object of the inventionv is to provide a I liner paper or board having a surface coating of china clay, blanc fixe or other equivalent material to impart a smooth or satinyfinish, and to produce the same at one operation in a paper machine.
- kiesel-guhr or f cellite, and wood flour either separately or m combination, havethe property or capaclty, when suspended in water, of being formed on machine and of being transferred to a makeup roll or blanket thereof, although the layer or layers thus placed or built up on the makeup roll or blanket cannot be removed as a web or sheet as they have no tensile strength.
- a beating engine I prepare a suitable pulp by vigorously beating together 50 parts, by weight, of mixed waste paper and an equal amount of bleached sulphite pulp. When this has been accomplished; I add 5 parts of rosin size, and, when this has been thoroughly brushed (it into the pulp, I add 5 parts of alum and continue the beating until reaction has been accomplished.
- a composite web consisting of a layer or web of fiber and a faeially contiguous adherent layer of kieselguhr-wood flour-clay so mixture.
- the wet web or sheet is now treated in the usual manner followed in the manufacture of paper, being dried, calendered and wound into rolls. On being dried and calendered, the sheet hasv a surfacelayer comprising about 70% of china clay and 30% of the carrier.
- the size may be omitted. Again, I should not regard it as a departure from the invention if the top layer should contain some fibers and/or a size. Thus, in the formation of the stock for the top layer, I may use:
- any equivalent pulverulent material may be used, such, for example, as blanc fixe, pulverized rosin or carbon black, or other finely powdered pigments.
- a composite sheet as herein described forms perfectly and the laminations or layers adhere or interlock most satisfactorily.
- the bottom fibrous layer of the composite web or sheet may be made of any approved fibrous or cellulosic materials (sized or unsized as oocaslon demands) which it may be desired to use in the formation of any predetermined form of board or paper, the examples which I have herem given being illustrative of composite webs embodying the invention and of the new or improved process which may be practiced in their production.
- a composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of pulverulent coating material, and kieselguhr.
- a composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of a'small proportion of kieselguhr and a dominant proportion of pulverulent coating material.
- a composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of a small proportion of kieselguhr, a precipitate, and a dominant proportion of pulverulent coating material.
- a process of producing a sheet having a surface layer of a pulverulent material which comprises forming a web of pulp, independently forming a substantially nonfibrous Web from an aqueous suspension of the pulverulent material carried by a finely divided carrier, and applying it as a contiguous adhering layer to said web of pulp, and then simultaneously removing the water from both webs.
- A. process of producing a sheet having a surface layer of a pulverulent material which comprises forming on independent cylinder molds and uniting a web of cellulose pulp and asubstantiallynon-fibrous web of pulverulent material carried by a finely divided carrier capable by itself of forming on the cylinder mold, and drying the sheet.
- a process which comprises forming into contiguous, adherent webs on a multi-. ple cylinder machine, a web of cellulose pulp and a substantially non-fibrous web of a finewood flour, which is a finely-disintegratedly divided material carrying a preponderant messed proportion of pulverulent material, and drying the sheet thus produced.
- a process which comprises forming into contiguous, adherent webs on a multiple cylinder machine, a web of cellulose pulp and a substantially non-fibrous web of a finely divided material carrying a size and a -pre ponderant proportion of pulverulent material and drying the sheet thus produced.
- a process which comprises forming into contiguous, adherent webs on a cylinder machine, a web of cellulose pulp and a web comprising onlya small portion of fibrous material, size, and a finely divided material, carrying a preponderant proportion ot a pulverulent material; and drying the sheet thus produced.
- a process of producing a paper having a surface layer of pulverulent coating material which comprises forming'a web of pulp, independently forming a substantially non-fibrous web of kieselguhr carrying a preponderant proportion of the coating material, applying said second-mentioned Web as a continuous adherent layer to thesweb of pulp, and drying the web.
- a composite sheet comprising a bottom layer of cellulose fiber, and a top layer comprising a mixture of china clay and kieselguhr.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Description
Patented June 24, 1930 mas-6e I ALBERT L, CLAPP, OF"DAN VE BS, MASSACHUSETTS LINER mean on PAPER,
Zlt'o Drawing.
In the manufacture of paper or card-board of the kind known commercially as patent coated, such as used in the manufacture of cartons, boxes, containersand for other uses,
. it is customary by a suitable coating machine to apply to a sheet of formed and dried paper or board, a surface coating of china clay, blanc fixe or other surfacing material, and casein or other like adhesive.
The object of the inventionv is to provide a I liner paper or board having a surface coating of china clay, blanc fixe or other equivalent material to impart a smooth or satinyfinish, and to produce the same at one operation in a paper machine. I
I have made the discovery that kiesel-guhr or f cellite, and wood flour, either separately or m combination, havethe property or capaclty, when suspended in water, of being formed on machine and of being transferred to a makeup roll or blanket thereof, although the layer or layers thus placed or built up on the makeup roll or blanket cannot be removed as a web or sheet as they have no tensile strength.
I have also discovered that these two substances also have the property of carrying with them a large or dominant quantity of china clay, blanc fixe or other pulverulent 3o coating materials. As a result of these two discoveries, I have found from prolongedexperlmentation that it is possible to apply to a layer of paper or board, while it is being formed and 1s still in a wet state, a lay of cellite or wood flour or both, and the prev1ously-ment1oned coating materials, so that, when the composite sheet is dried, it possesses the deslrable characteristics of the pat,- ent coated paper or board.
In carrying out my invention, Iuse a 'mul tlple-cyhnder paper machine having the proper vats associated withthe several cylinders and transfer rolls. In one of the vats I placeany suitable paper stock such as may 46 be required for producing the desired paper the cylinder mold of a paper Application filed December 22, 1922: Serial No. 608,579.
or board, and in another vat I place an aqueous suspension of cellite and/or wood flour and a dominantproportion of the desired filler or coating substance. {Ihen to the wet web of the paper stock, tramsferred to the 50 blanket or belt of the machine, I apply a layer of the stock in the second vat, or vice versa, so that a composite Web or sheet is formed which is dried in the usual manner, with the result that the finished producthas an adherent topsurface or layer of the coating substance.
In carrying out my invention, one may proceed as follows: In a beating engine, I prepare a suitable pulp by vigorously beating together 50 parts, by weight, of mixed waste paper and an equal amount of bleached sulphite pulp. When this has been accomplished; I add 5 parts of rosin size, and, when this has been thoroughly brushed (it into the pulp, I add 5 parts of alum and continue the beating until reaction has been accomplished. In another beating engine I place 10 parts, by weight, of cellite or kieselguhr, 20 parts of wood flour, and parts of 70 china clay, together with water to form a suspension. These are beaten or agitated until a suspension is produced which will form on thecylinder mold of a paper machine. Then into two separate vats of a multiplecylinder paper machine are placed the stocks produced asv hereinbefore, provided, and a composite web is formed consisting of a layer or web of fiber and a faeially contiguous adherent layer of kieselguhr-wood flour-clay so mixture. The wet web or sheet is now treated in the usual manner followed in the manufacture of paper, being dried, calendered and wound into rolls. On being dried and calendered, the sheet hasv a surfacelayer comprising about 70% of china clay and 30% of the carrier.
Obviously it is unnecessary that the fibrous lamination or bottom layer of the fibrous sheet should be sized, and consequently, in
the formation of the pulp, the size may be omitted. Again, I should not regard it as a departure from the invention if the top layer should contain some fibers and/or a size. Thus, in the formation of the stock for the top layer, I may use:
5 to 20 parts bleached sulphite pulp,
10 to 20 parts wood flour,
10 to 20 parts cellite,
50 to 70 parts china clay,
10 parts silicate of soda (or rosin size),
5 parts alum.
In such case, one may vigorously beat together in a beating engine the sulphite pulp and the wood flour with water for about an hour, after which the cellite and the china clay are added and. the'stock beaten for a further period of about 30 minutes. Then the sillicate of soda is thoroughly incorporated in the stock, and finally the alum is added, after which the stock is brushed out for about anhour. The sodium silicate 01' sodium resinate is precipitated as alumi-' num silicate or aluminum resinate by the alum, and constitutes a gelatinous size which coagulates and asslsts m retammg the china clay.
Of course I do not limit myself to the use of china clay in the formation of the top layer, as any equivalent pulverulent material may be used, such, for example, as blanc fixe, pulverized rosin or carbon black, or other finely powdered pigments.
A composite sheet as herein described forms perfectly and the laminations or layers adhere or interlock most satisfactorily.
I am not familiar with any generic name,
otherthan the term carrier or words of similar import, which can be applied to wood flour and kieselguhr or cellite. Either of these materials or both in combination have the properties hereinbefore described of forming on the cylinder mold and of being transferred as a continuous layer to the blanket or felt of a paper machine and act as earners in carryin or absorbing many times their weight of pu @rulent material in their Due to the lack of a better' formation.
term, I desire to havejt understood that in the claims, whenever I refer to carrier I I mean either kieselguhr or wood flour alone or in admixture.
I also desire to be understod that the bottom fibrous layer of the composite web or sheet may be made of any approved fibrous or cellulosic materials (sized or unsized as oocaslon demands) which it may be desired to use in the formation of any predetermined form of board or paper, the examples which I have herem given being illustrative of composite webs embodying the invention and of the new or improved process which may be practiced in their production.
1le I have herein referred to the use of character has the property of forming on a cylinder mold, although in my opinion the results are not quite as satisfactory when finely-divided sawdust is used as when wood flour is used.
It is further obvious that, while I have referred to an exterior layer of china clay or blanc fixe, carbon black, or finely-divided pigments, the process as herein described includes the use-of any finely-divided or pulverized material of the character of resins, pigments, gums or the like; so that, in referring to a pulverulent material such as china clay or the like, I mean to include pulverulent substances of the character of all of those herein referred to which it-may be desired to employ in the formation of the top layer of the sheet.
What I claim is I 1. A composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of pulverulent coating material, and kieselguhr.
2. A composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of a'small proportion of kieselguhr and a dominant proportion of pulverulent coating material.
3. A composite sheet comprising a bottom layer of cellulosic material, and a top layer comprising a mixture of a small proportion of kieselguhr, a precipitate, and a dominant proportion of pulverulent coating material.
4. A process of producing a sheet having a surface layer of a pulverulent material, which comprises forming a web of pulp, independently forming a substantially nonfibrous Web from an aqueous suspension of the pulverulent material carried by a finely divided carrier, and applying it as a contiguous adhering layer to said web of pulp, and then simultaneously removing the water from both webs.
5. A. process of producing a sheet having a surface layer of a pulverulent material, which comprises forming on independent cylinder molds and uniting a web of cellulose pulp and asubstantiallynon-fibrous web of pulverulent material carried by a finely divided carrier capable by itself of forming on the cylinder mold, and drying the sheet.
6. A process which comprises forming into contiguous, adherent webs on a multi-. ple cylinder machine, a web of cellulose pulp and a substantially non-fibrous web of a finewood flour, which is a finely-disintegratedly divided material carrying a preponderant messed proportion of pulverulent material, and drying the sheet thus produced. I 1
7 A process which comprises forming into contiguous, adherent webs on a multiple cylinder machine, a web of cellulose pulp and a substantially non-fibrous web of a finely divided material carrying a size and a -pre ponderant proportion of pulverulent material and drying the sheet thus produced.
8. A process which comprises forming into contiguous, adherent webs on a cylinder machine, a web of cellulose pulp and a web comprising onlya small portion of fibrous material, size, and a finely divided material, carrying a preponderant proportion ot a pulverulent material; and drying the sheet thus produced. I
9. A process of producing a paper having a surface layer of pulverulent coating material, which comprises forming'a web of pulp, independently forming a substantially non-fibrous web of kieselguhr carrying a preponderant proportion of the coating material, applying said second-mentioned Web as a continuous adherent layer to thesweb of pulp, and drying the web.
10. A composite sheet comprising a bottom layer of cellulose fiber, and a top layer comprising a mixture of china clay and kieselguhr.
In testimony whereof I have afixed my signature.
ALBERT L. QLAPR
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US608579A US1765860A (en) | 1922-12-22 | 1922-12-22 | Liner board or paper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US608579A US1765860A (en) | 1922-12-22 | 1922-12-22 | Liner board or paper |
Publications (1)
Publication Number | Publication Date |
---|---|
US1765860A true US1765860A (en) | 1930-06-24 |
Family
ID=24437115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US608579A Expired - Lifetime US1765860A (en) | 1922-12-22 | 1922-12-22 | Liner board or paper |
Country Status (1)
Country | Link |
---|---|
US (1) | US1765860A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047457A (en) * | 1957-02-14 | 1962-07-31 | Nikolaus Wilhelm Knauf | Process for producing construction elements of any shape |
US20050051290A1 (en) * | 2003-09-05 | 2005-03-10 | Beasley Billy Franklin | Low density paperboard sheet and tube incorporating the same |
-
1922
- 1922-12-22 US US608579A patent/US1765860A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047457A (en) * | 1957-02-14 | 1962-07-31 | Nikolaus Wilhelm Knauf | Process for producing construction elements of any shape |
US20050051290A1 (en) * | 2003-09-05 | 2005-03-10 | Beasley Billy Franklin | Low density paperboard sheet and tube incorporating the same |
WO2005026438A1 (en) * | 2003-09-05 | 2005-03-24 | Sonoco Development, Inc. | Low density paperboard sheet and tube incorporating the same |
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