CA2060746A1 - Manufacture of calcium hydrosilicate bound fiberboard - Google Patents
Manufacture of calcium hydrosilicate bound fiberboardInfo
- Publication number
- CA2060746A1 CA2060746A1 CA002060746A CA2060746A CA2060746A1 CA 2060746 A1 CA2060746 A1 CA 2060746A1 CA 002060746 A CA002060746 A CA 002060746A CA 2060746 A CA2060746 A CA 2060746A CA 2060746 A1 CA2060746 A1 CA 2060746A1
- Authority
- CA
- Canada
- Prior art keywords
- weight
- binder
- solids content
- fiber
- cement
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K9/00—Peptides having up to 20 amino acids, containing saccharide radicals and having a fully defined sequence; Derivatives thereof
- C07K9/001—Peptides having up to 20 amino acids, containing saccharide radicals and having a fully defined sequence; Derivatives thereof the peptide sequence having less than 12 amino acids and not being part of a ring structure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Veterinary Medicine (AREA)
- Genetics & Genomics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Animal Behavior & Ethology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Public Health (AREA)
- General Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Biophysics (AREA)
- Pharmacology & Pharmacy (AREA)
- Molecular Biology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Peptides Or Proteins (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Saccharide Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Calcium hydrosilicate bound fiberboard, in particular double-deck board, is manufac-tured in a process wherein a fiber-binder-filler mixture having a water content of 40 to 45 % by weight and a solids content of 55 to 60 % by weight is prepared by digesting cellulose fibers in an amount of from 2 to 12 %
by weight of the solids content with water and mixing them with the binder comprising cement and/or lime hydrate and substances containing reactive calcium silicates and also the fillers to form a thick pasty mixture, whereupon the thick pasty mixture is introduced in a predetermined amount into the frame of a bottom mold of a single-shot press which further includes a top mold, essentially leveled out, formed by closing top and bottom mold, and, via dewatering fabrics and channels in the top and bottom molds, dewatered, compacted and vented, whereupon the raw board thus formed is demolded and autoclaved.
by weight of the solids content with water and mixing them with the binder comprising cement and/or lime hydrate and substances containing reactive calcium silicates and also the fillers to form a thick pasty mixture, whereupon the thick pasty mixture is introduced in a predetermined amount into the frame of a bottom mold of a single-shot press which further includes a top mold, essentially leveled out, formed by closing top and bottom mold, and, via dewatering fabrics and channels in the top and bottom molds, dewatered, compacted and vented, whereupon the raw board thus formed is demolded and autoclaved.
Description
`r , a~o 7Ll ~o Manufacture of calclum hydrosilicate bound fiberboard The present invention relates to a process for manufacturing calcium hydroslllcate bound flberboard.
In relatlon to cement bound fiberboard it ls known to apply a slurry contalning a mlxture of cellulose flber and cement to a wlre-cloth wlth a large excess of water to produce thln layers whlch are superposed on one another ln the moist state and then pressed together, to be finally cut to size and autoclaved. The use of the wire-cloth of a papermaker's machine limits the thickness of the indlvidual layers accordingly, and the consequently necessary layering has the effect that, in certain clrcumstances, layers having dlfferent moisture contents are arranged on top of one another. It ls true that this layering, given an appropriate offset arrangement, can to a certain extent eliminate the anisotropy in the mechanlcal propertles of the flberboard, produced ln any one layer by the use of water as transport medlum, but lt ls also costly. The layerlng, moreover, ls responslble for the fact that, when the raw board thus produced ls autoclaved, lt ls prone to dlshlng, l.e. dlsh-llke warpage at the edges, whlch impairs product quality and makes working over necessary.
It ls an ob~ect of the present lnvention to provlde a process of the kind mentloned at the beglnnlng whereby flberboard of unlform and conslstent quallty ls produclble ln a slmpllfled manner.
Thls ob~ect is achieved by a process for q4(D
manufacturlng calclum hydrosllicate bound flberboard ln a double-deck board, comprlslng the followlng steps: pulplng cellulose flbers; mlxlng sald cellulose flbers wlth a blnder lncludlng cement and/or llme hydrate and reactlve calclum slllcate and a filler to form a pasty flber-blnder-flller mlxture havlng a water content of about 40 to about 45% by welght and sollds content of about 55 to about 60% by welght, sald sollds content lncludlng about 2 to about 12% cellulose flbers by welght; lntroduclng sald pasty flber-blnder-flller mlxture ln a predetermlned amount lnto a frame of a bottom mold of a slngle-shot press, sald press lncludlng a top mold;
substantlally levellng sald pasty flber-blnder-flller mlxture;
closlng sald top and bottom molds; compresslng sald top and bottom mold to form a raw board by compactlon under dewaterlng and ventlng sald pasty flber-blnder-flller mlxture vla dewaterlng fabrlcs and channels ln sald top and bottom molds;
demoldlng sald raw board; and autoclavlng sald raw board.
In the course of the process, the blnder cement, for example Portland, lron Portland or blast furnace cement, or rather lts llme content, or the free llme used as llme hydrate, reacts wlth reactlve calclum slllcate durlng autoclavlng to form strength-produclng CsH phases. Sultable reactlve calclum silicates are microslllcate (in particular if cement is used), finely ground quartz powder, latently hydraulic substances such as pozzuolanas, for example fly ash or SiO2-rich slags, which in part react with the free or freed lime and in part can also act as filler or addltlonal filler.
Inter alia, fly ash, which can be added in a proportion of up ~0(~0 7~
to 25 % by welght of the sollds content, has a favorable effect on the flber-blnder-flller mlxture ln that lt reduces the water requlred and makes the mixture more malleable.
The cellulose flbers are preferably used ln an amount of from 4 to 7 % by welght of the sollds content of the mlxture and preferably as sulfate cellulose and optlonally together wlth other relnforclng flbers.
Advantageously, the sollds content of the mlxture ls prepared as a whole or ln part from 2-12 % by welght, ln partlcular 4-7 % by welght, of cellulose flber, 2-12 % by welght, ln partlcular 6-10 % by welght, of mlcroslllca and up to 25 % by welght, ln partlcular 10-20 % by welght, of latently hydraullc substances, ln partlcular fly ash.
The lnventlon wlll now be more partlcularly descrlbed wlth reference to the accompanylng process flow dlagram.
The cellulose flbers, whlch may be paper and/or pulp flbers wlth or wlthout a proportlon of commlnuted - 2a -20607q6 waste paper, are digested in a pulper 1 while at the same time the other solid components are mixed in a dry mixer 2. The pulp from pulper 1 and the dry mixture from dry mixer 2 are mixed in a wet mixer 3 to form a thick pasty mixture, to which may additionally be added a liquid solidification accelerant for the cement, if the mixture contains cement.
The thick pasty mixture is introduced in the necesæary amount, which can be measured gravimetrically or volumetrically, into a bottom frame 4 surrounding a bottom mold 5 of a single-shot press 6. The mixture, which initially forms a heap with a low tendency to flatten, is essentially leveled out in the bottom frame 4. This can be effected for example by riddling, raking or spr~A~ing apart by means of a plunger. Since the mixture has the consistency of a thick paste, it would otherwise not be sufficiently distributed over the area bounded by the bottom frame 4 within the single-shot press 6, which would result in quality-reducing thickness fluctuations which might also make costly working over necessary. The leveling, by contrast, produces fiberboard of uniform, consistent quality.
After leveling, the mixture is formed within the single-shot press 6 into board of appropriate dimensions, determined by bottom frame 4, by closing top mold 7 and bottom moid 5. At the same time the mixture is dewatered, the fibers forming a fleece. For this purpose, the top and bottom molds 7, 5 have each been provided with a dewatering fabric and channels, and a wire mesh is advantageously arranged between dewatering fabric and upper and lower mold 7, 5, respectively, in order to prevent the dewatering fabric being pressed into the openings of the dewatering channels. The top mold 7 is advantageously movable up and down within a top frame 8, which is itself movable up and down and which, on pressing, closely engages the bottom frame 4 and, after the raw fiherhoArd has been formed, holds it back in order to deposit it on a transfer means for transferring raw board into an autoclave 9. The raw board thus produced in one operation - 2 ~ ~a74~
is then autoclaved to initiate the strength-producing reactions, i.e. especially to form CsH phases.
Subsequently, a small amount of grinding may be necessary as working over.
S The thickness of the fiberboard is determined by the amount of mixture introduced into the bottom frame 4, assuming constant molding pressure. The molding pressures are of the order of 50 kp/cm2.
Prior to every molding operation the parts of the press 6 which come into contact with the mixture are sprayed with release agent in order to avoid caking.
This avoids the production of any anisotropy as well as a multilayered structure or a cutting of raw board to size or the proneness to dishing. Similarly, the amount of water to be removed from the mixture is significantly reduced.
In relatlon to cement bound fiberboard it ls known to apply a slurry contalning a mlxture of cellulose flber and cement to a wlre-cloth wlth a large excess of water to produce thln layers whlch are superposed on one another ln the moist state and then pressed together, to be finally cut to size and autoclaved. The use of the wire-cloth of a papermaker's machine limits the thickness of the indlvidual layers accordingly, and the consequently necessary layering has the effect that, in certain clrcumstances, layers having dlfferent moisture contents are arranged on top of one another. It ls true that this layering, given an appropriate offset arrangement, can to a certain extent eliminate the anisotropy in the mechanlcal propertles of the flberboard, produced ln any one layer by the use of water as transport medlum, but lt ls also costly. The layerlng, moreover, ls responslble for the fact that, when the raw board thus produced ls autoclaved, lt ls prone to dlshlng, l.e. dlsh-llke warpage at the edges, whlch impairs product quality and makes working over necessary.
It ls an ob~ect of the present lnvention to provlde a process of the kind mentloned at the beglnnlng whereby flberboard of unlform and conslstent quallty ls produclble ln a slmpllfled manner.
Thls ob~ect is achieved by a process for q4(D
manufacturlng calclum hydrosllicate bound flberboard ln a double-deck board, comprlslng the followlng steps: pulplng cellulose flbers; mlxlng sald cellulose flbers wlth a blnder lncludlng cement and/or llme hydrate and reactlve calclum slllcate and a filler to form a pasty flber-blnder-flller mlxture havlng a water content of about 40 to about 45% by welght and sollds content of about 55 to about 60% by welght, sald sollds content lncludlng about 2 to about 12% cellulose flbers by welght; lntroduclng sald pasty flber-blnder-flller mlxture ln a predetermlned amount lnto a frame of a bottom mold of a slngle-shot press, sald press lncludlng a top mold;
substantlally levellng sald pasty flber-blnder-flller mlxture;
closlng sald top and bottom molds; compresslng sald top and bottom mold to form a raw board by compactlon under dewaterlng and ventlng sald pasty flber-blnder-flller mlxture vla dewaterlng fabrlcs and channels ln sald top and bottom molds;
demoldlng sald raw board; and autoclavlng sald raw board.
In the course of the process, the blnder cement, for example Portland, lron Portland or blast furnace cement, or rather lts llme content, or the free llme used as llme hydrate, reacts wlth reactlve calclum slllcate durlng autoclavlng to form strength-produclng CsH phases. Sultable reactlve calclum silicates are microslllcate (in particular if cement is used), finely ground quartz powder, latently hydraulic substances such as pozzuolanas, for example fly ash or SiO2-rich slags, which in part react with the free or freed lime and in part can also act as filler or addltlonal filler.
Inter alia, fly ash, which can be added in a proportion of up ~0(~0 7~
to 25 % by welght of the sollds content, has a favorable effect on the flber-blnder-flller mlxture ln that lt reduces the water requlred and makes the mixture more malleable.
The cellulose flbers are preferably used ln an amount of from 4 to 7 % by welght of the sollds content of the mlxture and preferably as sulfate cellulose and optlonally together wlth other relnforclng flbers.
Advantageously, the sollds content of the mlxture ls prepared as a whole or ln part from 2-12 % by welght, ln partlcular 4-7 % by welght, of cellulose flber, 2-12 % by welght, ln partlcular 6-10 % by welght, of mlcroslllca and up to 25 % by welght, ln partlcular 10-20 % by welght, of latently hydraullc substances, ln partlcular fly ash.
The lnventlon wlll now be more partlcularly descrlbed wlth reference to the accompanylng process flow dlagram.
The cellulose flbers, whlch may be paper and/or pulp flbers wlth or wlthout a proportlon of commlnuted - 2a -20607q6 waste paper, are digested in a pulper 1 while at the same time the other solid components are mixed in a dry mixer 2. The pulp from pulper 1 and the dry mixture from dry mixer 2 are mixed in a wet mixer 3 to form a thick pasty mixture, to which may additionally be added a liquid solidification accelerant for the cement, if the mixture contains cement.
The thick pasty mixture is introduced in the necesæary amount, which can be measured gravimetrically or volumetrically, into a bottom frame 4 surrounding a bottom mold 5 of a single-shot press 6. The mixture, which initially forms a heap with a low tendency to flatten, is essentially leveled out in the bottom frame 4. This can be effected for example by riddling, raking or spr~A~ing apart by means of a plunger. Since the mixture has the consistency of a thick paste, it would otherwise not be sufficiently distributed over the area bounded by the bottom frame 4 within the single-shot press 6, which would result in quality-reducing thickness fluctuations which might also make costly working over necessary. The leveling, by contrast, produces fiberboard of uniform, consistent quality.
After leveling, the mixture is formed within the single-shot press 6 into board of appropriate dimensions, determined by bottom frame 4, by closing top mold 7 and bottom moid 5. At the same time the mixture is dewatered, the fibers forming a fleece. For this purpose, the top and bottom molds 7, 5 have each been provided with a dewatering fabric and channels, and a wire mesh is advantageously arranged between dewatering fabric and upper and lower mold 7, 5, respectively, in order to prevent the dewatering fabric being pressed into the openings of the dewatering channels. The top mold 7 is advantageously movable up and down within a top frame 8, which is itself movable up and down and which, on pressing, closely engages the bottom frame 4 and, after the raw fiherhoArd has been formed, holds it back in order to deposit it on a transfer means for transferring raw board into an autoclave 9. The raw board thus produced in one operation - 2 ~ ~a74~
is then autoclaved to initiate the strength-producing reactions, i.e. especially to form CsH phases.
Subsequently, a small amount of grinding may be necessary as working over.
S The thickness of the fiberboard is determined by the amount of mixture introduced into the bottom frame 4, assuming constant molding pressure. The molding pressures are of the order of 50 kp/cm2.
Prior to every molding operation the parts of the press 6 which come into contact with the mixture are sprayed with release agent in order to avoid caking.
This avoids the production of any anisotropy as well as a multilayered structure or a cutting of raw board to size or the proneness to dishing. Similarly, the amount of water to be removed from the mixture is significantly reduced.
Claims (12)
1. A process for manufacturing calcium hydrosilicate bound fiberboard in a double-deck board, comprising the following steps: pulping cellulose fibers; mixing said cellulose fibers with a binder including cement and/or lime hydrate and reactive calcium silicate and a filler to form a pasty fiber-binder-filler mixture having a water content of about 40 to about 45% by weight and solids content of about 55 to about 60% by weight, said solids content including about 2 to about 12% cellulose fibers by weight; introducing said pasty fiber-binder-filler mixture in a predetermined amount into a frame of a bottom mold of a single-shot press, said press including a top mold; substantially leveling said pasty fiber-binder-filler mixture; closing said top and bottom molds; compressing said top and bottom mold to form a raw board by compaction under dewatering and venting said pasty fiber-binder-filler mixture via dewatering fabrics and channels in said top and bottom molds; demolding said raw board; and autoclaving said raw board.
2. The process of claim 1, wherein the solids content includes from about 4 to about 7% by weight of cellulose fiber.
3. The process of claim 1, wherein the cement is Portland, iron Portland or blast furnace cement.
4. The process of claim 1, wherein the solids content includes from about 2 to about 12% by weight microsilica, and about 10 to about 20% by weight of latently hydraulic substances selected from the group consisting of pozzuolanic substances, wherein the remainder of said solids content includes cement and said cellulose fiber.
5. The process of claim 4, wherein the pozzuolanic substances include fly ash.
6. The process of claim 4, wherein said solids content includes from about 6% to about 10% by weight micro silica.
7. The process of any one of claims 1 to 6, wherein the pasty fiber-binder-filler mixture further comprises a liquid hardening accelerant for the cement.
8. The process of any one of claims 1 to 6, wherein said pasty fiber-binder-filler mixture further comprises finely ground quartz powder as co-reactant to lime hydrate and as filler.
9. The process of any one of claims 1 to 6, wherein the step of leveling is effected by riddling, raking or spreading by means of a plunger.
10. The process of any one of claims 1 to 6, wherein the frame and the dewatering fabrics of the single-shot press are each sprayed with a release agent.
11. The process of any one of claims 1 to 6, wherein the cellulose fibers used are selected from the group consisting of paper, pulp fibers and comminuted waste paper.
12. The process of any one of claims 1 to 6, wherein the solids other than the cellulose fibers are premixed dry and mixed into the pulp formed by the cellulose fibers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4106010.5 | 1991-02-26 | ||
| DE4106101A DE4106101A1 (en) | 1991-02-27 | 1991-02-27 | FUCOSE-MARKED CYTOSTATICS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2060746A1 true CA2060746A1 (en) | 1992-08-27 |
Family
ID=6425976
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002060746A Abandoned CA2060746A1 (en) | 1991-02-26 | 1992-02-05 | Manufacture of calcium hydrosilicate bound fiberboard |
| CA002061993A Abandoned CA2061993A1 (en) | 1991-02-27 | 1992-02-27 | Fucose-bearing cytostatics |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002061993A Abandoned CA2061993A1 (en) | 1991-02-27 | 1992-02-27 | Fucose-bearing cytostatics |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0501250A1 (en) |
| JP (1) | JPH0578394A (en) |
| CA (2) | CA2060746A1 (en) |
| DE (1) | DE4106101A1 (en) |
| FI (1) | FI920834A7 (en) |
| HU (1) | HUT60283A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5508387A (en) * | 1993-08-04 | 1996-04-16 | Glycomed Incorporated | Selectin binding glycopeptides |
| DE19512484A1 (en) * | 1995-04-04 | 1996-10-17 | Bayer Ag | Carbohydrate modified cytostatics |
| ID23424A (en) * | 1997-05-14 | 2000-04-20 | Bayer Ag | GLIKOKONJUGUS OF 20 (S) -CAMPTOTESIN |
| DE10005275A1 (en) * | 2000-02-07 | 2001-08-09 | Bayer Ag | Novel glycoconjugates |
| US7220824B1 (en) | 2000-08-28 | 2007-05-22 | Bayer Aktiengesellschaft | Integrin-mediated drug targeting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5135736A (en) * | 1988-08-15 | 1992-08-04 | Neorx Corporation | Covalently-linked complexes and methods for enhanced cytotoxicity and imaging |
| US4980343A (en) * | 1988-10-27 | 1990-12-25 | Bayer Aktiengesellschaft | Aminooxodihydroisoindoloquinazoline carcinostatic agents |
-
1991
- 1991-02-27 DE DE4106101A patent/DE4106101A1/en not_active Withdrawn
-
1992
- 1992-02-05 CA CA002060746A patent/CA2060746A1/en not_active Abandoned
- 1992-02-14 EP EP92102449A patent/EP0501250A1/en not_active Withdrawn
- 1992-02-21 JP JP4069939A patent/JPH0578394A/en active Pending
- 1992-02-25 FI FI920834A patent/FI920834A7/en unknown
- 1992-02-26 HU HU9200637A patent/HUT60283A/en unknown
- 1992-02-27 CA CA002061993A patent/CA2061993A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4106101A1 (en) | 1992-09-03 |
| CA2061993A1 (en) | 1992-08-28 |
| HU9200637D0 (en) | 1992-05-28 |
| EP0501250A1 (en) | 1992-09-02 |
| FI920834L (en) | 1992-08-28 |
| HUT60283A (en) | 1992-08-28 |
| FI920834A0 (en) | 1992-02-25 |
| JPH0578394A (en) | 1993-03-30 |
| FI920834A7 (en) | 1992-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |