NO772290L - PROCEDURE FOR MAKING A MINERAL FIBER PATH - Google Patents
PROCEDURE FOR MAKING A MINERAL FIBER PATHInfo
- Publication number
- NO772290L NO772290L NO772290A NO772290A NO772290L NO 772290 L NO772290 L NO 772290L NO 772290 A NO772290 A NO 772290A NO 772290 A NO772290 A NO 772290A NO 772290 L NO772290 L NO 772290L
- Authority
- NO
- Norway
- Prior art keywords
- binder
- stated
- drying
- web
- added
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 16
- 239000002557 mineral fiber Substances 0.000 title claims description 5
- 239000011230 binding agent Substances 0.000 claims description 40
- 239000000835 fiber Substances 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 20
- 239000000725 suspension Substances 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002174 Styrene-butadiene Substances 0.000 claims 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims 1
- 239000011115 styrene butadiene Substances 0.000 claims 1
- 229920003048 styrene butadiene rubber Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 description 11
- 239000010425 asbestos Substances 0.000 description 10
- 229910052895 riebeckite Inorganic materials 0.000 description 10
- 239000011490 mineral wool Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007590 electrostatic spraying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/12—Absence of mineral fibres, e.g. asbestos
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Inorganic Fibers (AREA)
- Nonwoven Fabrics (AREA)
Description
Ved fremstilling av visse typer av gulvmateriale anvendes som underlagsfilt et porost ark med asbest som vesentlig bestand- In the production of certain types of floor material, a porous sheet with asbestos as a significant component is used as underlay
del. Asbest kan imidlertid innebære helserisikoer•og man har derfor foreslått, i denne sammenheng såvel som i andre, at asbesten skal skiftes ut med kunstig mineralull f.eks. stenull, glassvatt eller lignende, da kunstig mineralull ikke gir de helserisikoer som asbesten gir. Erstatter man nu imidlertid asbesten helt enkelt med tilsvarende mengde mineralull får man en fiberbane:, hvis strekkf asthet, fleksibilitet og inntrykksbestandighet er meget underlegen i forhold til det produkt, som baserer seg på asbest som fibermateriale. De kunstige mineral-.fibre er til forskjell fra asbestfibrene helt glatte og krever share. However, asbestos can involve health risks•and it has therefore been proposed, in this context as well as in others, that the asbestos should be replaced with artificial mineral wool, e.g. rock wool, glass wool or the like, as artificial mineral wool does not pose the health risks that asbestos poses. However, if you now simply replace the asbestos with an equivalent amount of mineral wool, you get a fiber web whose tensile strength, flexibility and impact resistance are very inferior to the product based on asbestos as a fiber material. The artificial mineral fibres, unlike the asbestos fibres, are completely smooth and require
en helt annen bindemiddeleffekt enn asbesten. Ikke engang klart uokonomiske og også fra andre synspunkter uegnede binde- • middelinnhold har vist seg å kunne oppveie denne forskjell i fiberegenskaper. a completely different binder effect than asbestos. Not even clearly uneconomical and also from other points of view unsuitable binder contents have been shown to be able to compensate for this difference in fiber properties.
Ved foreliggende oppfinnelse anvises imidlertid en metode, ved hvilken en på kunstig mineralull basert fiberbane med rimelige bindemiddelmengder kan gis slike egenskaper, at den kan erstatte tilsvarende asbestprodukter. Den ved foreliggende oppfinnelse fremkomne fremgangsmåte har imidlertid videre anvendelse enn bare ved erstatning av asbestprodukter. Oppfinnelsen vedrorer en våt prosess hvor forst en suspensjon av kunstige mineralfibre i vann tilberedes, fra fibersuspensjonen formes et ark og til slutt torkes dette ark. The present invention, however, provides a method by which a fiber web based on artificial mineral wool with reasonable amounts of binder can be given such properties that it can replace corresponding asbestos products. However, the method developed by the present invention has further applications than just the replacement of asbestos products. The invention relates to a wet process where first a suspension of artificial mineral fibers in water is prepared, a sheet is formed from the fiber suspension and finally this sheet is dried.
Ifolge oppfinnelsen utsettes banen for merkbar komprimering i forbindelse med torkingen. Det har da vist seg å være særlig fordelaktig hvis komprimeringen påbegynnes og oppheves slik at den bibeholdes under storstedelen av torkingen fortrinnsvis slik at den opprettholdes inntil banen er helt eller nesten helt torr. År-saken til at man derved får en så utpreget positiv effekt, en effekt som langt overskrider den som selve densitetsokningen gir, kan efter studier antas å være. at bindemiddeldråpene, som i begynnelsesstadiet består av en viss vannmengde med deri inn-gående en eller flere bindemiddelpartikler, fra begynnelsen av omfatter eller i det minste berbrer to eller flere fibre. Når vannet avgår reduseres selvsagt dråpens volum slik at bindemid-delpartiklene frilegges. Det kan da hende, og hender også åpen-bart i betydelig omfang, at de enkelte bindemiddelpartikler ikke lenger er i stand til å spenne over avstanden mellom fibrene. Noen bindemiddelvirkning oppstår da heller ikke. According to the invention, the web is exposed to noticeable compression in connection with the drying. It has then been shown to be particularly advantageous if the compaction is started and canceled so that it is maintained during the greater part of the drying, preferably so that it is maintained until the web is completely or almost completely dry. According to studies, the reason why one thereby gets such a pronounced positive effect, an effect that far exceeds that of the increase in density itself, can be assumed to be. that the binder drops, which in the beginning stage consist of a certain amount of water with one or more binder particles included, from the beginning include or at least retain two or more fibers. When the water leaves, the volume of the drop naturally decreases so that the binder particles are exposed. It can then happen, and obviously happens to a considerable extent, that the individual binder particles are no longer able to span the distance between the fibres. No binding agent effect then occurs either.
Anderledes forholder det seg om de fibre som berores av en viss bindemiddeldispersjonsdråpe, presses sammen slik at avstanden blir liten. De efter fordampningen av vannet igjenværende bindemiddelpartikler er da i stand til å binde sammen fibrene. Når torkingen er avsluttet og avlastning har skjedd,.ekspanderer fiberbanen men da er bindingen allerede etablert. Man kunne i prinsippet tenke seg at denne effekt ville kunne oppnås f.eks. ved en mer eller mindre momentan sammenpressing av fiberbanen. efter torkeforlopets avslutning men eventuelt for fibérbanens avkjoling. Den effekt, som da oppnås er imidlertid.betydelig mindre og det synes derfor å være av betydning at bindingen mellom dé ved komprimeringen tett inntil hverandre liggende fibre får oppstå suksessivt i forbindelse med vannets fordampning ved torkeforlopet. The situation is different if the fibers that are touched by a certain binder dispersion drop are pressed together so that the distance is small. The binder particles remaining after the evaporation of the water are then able to bind the fibers together. When drying is finished and relief has taken place, the fiber web expands but then the bond is already established. In principle, one could imagine that this effect could be achieved e.g. by a more or less instantaneous compression of the fiber web. after the end of the drying process but possibly before the cooling of the fiber web. The effect that is then achieved is, however, significantly less and it therefore seems to be important that the bond between the fibers lying close to each other during the compression is allowed to occur successively in connection with the evaporation of the water during the drying process.
For at effekten av oppfinnelsen skal fremtre kreves at komprimeringen under torkingen er merkbar. Helst skal den belope seg til minst 20% gjerne til minst 40% av det våte arks tykkelse. Et særlig egnet utstyr for utovelse av oppfinnelsen har vist seg å være torkesylindre, på i og for seg kjent måte hovedsakelig omgitt med' en torkefilt eller torkevire. Torkefilten eller torke-viren må imidlertid da være anordnet slik at den kan spennes i en slik grad at fiberbanen får nodvendig komprimering. Fordel-aktigst har ensylindermaskiner av Yankee-type vist seg å være, men også flersylindermaskiner kan anvendes da det ikke har vist seg å ha avgjbrende betydning at trykket avlastes i lopet av den tid banen forflytter seg fra sylinder til sylinder. Av storre betydning er imidlertid at komprimeringsgraden på de forskjellige sylindre er noenlunde ensartet. For the effect of the invention to appear, it is required that the compression during drying is noticeable. Ideally, it should amount to at least 20% preferably to at least 40% of the thickness of the wet sheet. A particularly suitable piece of equipment for carrying out the invention has proven to be drying cylinders, in a manner known per se, mainly surrounded by a drying felt or drying wire. However, the drying felt or drying wire must then be arranged so that it can be stretched to such an extent that the fiber web receives the necessary compression. Single-cylinder machines of the Yankee type have proven to be the most advantageous, but multi-cylinder machines can also be used as it has not been shown to be of decisive importance that the pressure is relieved during the time the path moves from cylinder to cylinder. Of greater importance, however, is that the degree of compression on the different cylinders is more or less uniform.
De effekter som utovelsen.av foran angitte trekk i oppfinnelsen medforer er ifolge hva som er erfart ved undersøkelser, å betrakte som hovedsakelig en effekt av en effektiv bindemiddelanvendelse. Det har da også vist seg at bindemiddeletfekten, slik den opp-trer i den ferdige mineralfiberbane, ytterligere kan for- The effects which the implementation of the aforementioned features in the invention bring about are, according to what has been experienced during investigations, to be regarded as mainly an effect of an effective binder application. It has also been shown that the binder effect, as it occurs in the finished mineral fiber web, can further
bedres ved tiltak i forbindelse med tilforselen av bindemiddel. Det har således vist seg å være av stor verdi at bindemiddelet tilfores i to trinn. En del av bindemiddelet bor da tilsettes i den fibersuspensjon, fra hvilken arket skal formes. improved by measures in connection with the supply of binder. It has thus proved to be of great value that the binder is added in two stages. A portion of the binder should then be added to the fiber suspension from which the sheet is to be formed.
En andre del av bindemiddelet skal derpå tilsettes det våte ark efterat avvanningen helt eller nesten helt er fullbyrdet. A second part of the binder must then be added to the wet sheet after the dewatering has been completely or almost completely completed.
Som bindemiddel i det forste bindemiddeltrinn synes en lateks av en akrylatpolymer i form av en dispersjon eller dermed sammen-lignbart bindemiddel å være optimalt. Særlig god blir effekten hvis dispersjonen fås til å koagulere for arkformingen. Koaguleringen kan skje i fibersuspensjonen efterat bindemiddeldisper-. sjonen er tilsatt men kan med fordel 'skje for tilsetningen av fibersuspensjonen da betingelsene for koaguleringen blir mer kontrollerbare. As a binder in the first binder step, a latex of an acrylate polymer in the form of a dispersion or thus a comparable binder seems to be optimal. The effect is particularly good if the dispersion is made to coagulate before the sheet is formed. The coagulation can take place in the fiber suspension after the binder dispersion. is added but can advantageously be done before the addition of the fiber suspension as the conditions for the coagulation become more controllable.
Det bindemiddel som tilsettes fibersuspensjonen, må utgjore minst 2% men bor ikke overstige 25% av fibrenes vekt. Fortrinnsvis bor bindemiddelmengden utgjore ca. 15% av fibervekten. The binder added to the fiber suspension must make up at least 2% but must not exceed 25% of the weight of the fibres. Preferably, the amount of binder should amount to approx. 15% of the fiber weight.
I det andre bindemiddeltrinn har det vist seg at styren-butadien-lateks eller lignende gir de beste, resultater. Det er imidlertid av avgjorende betydning at dette bindemiddel fordeles sær-deles jevnt og i form av små partikler. Påsproyting med hoy finfordelingsgrad er derfor funnet å være den mest formålstjen-lige tilsetningsmåte. Den sky av bindemiddelpartikler som derved oppstår lar seg imidlertid i praksis vanskelig styre, og det har vist seg spesielt fordelaktig å arbeide med elektrostatisk sproy-'ting. In the second binder step, it has been shown that styrene-butadiene-latex or the like gives the best results. However, it is of decisive importance that this binder is distributed particularly evenly and in the form of small particles. Spraying with a high degree of fine distribution has therefore been found to be the most expedient addition method. However, the cloud of binder particles that results is difficult to control in practice, and it has proven particularly advantageous to work with electrostatic spraying.
Bindemiddelmengden i det andre bindemiddeltilsetningstrinn bor likeledes utgjore minst 2, maksimalt 25% av fibrenes vekt. En hensiktsmessig dosering for de fleste formål er ca. 10% av fibrenes vekt. The amount of binder in the second binder addition step should also make up at least 2, a maximum of 25% of the weight of the fibres. An appropriate dosage for most purposes is approx. 10% of the fibres' weight.
Hvis bindemiddelmengden.i det forste trinn ligger nær den nedre grense, bor forholdsvis mere bindemiddel tilsettes i det andre trinn og omvendt. Den totale mengde bindemiddel bor derfor ikke belope seg til mindre enn 10%, helst ikke mindre enn 20% av fibrenes vekt. På den andre side oppnås ingen vesentlige fordeler hvis 40% av fibervekten overskrides, neppe heller ikke 30%. If the amount of binder in the first stage is close to the lower limit, relatively more binder should be added in the second stage and vice versa. The total amount of binder should therefore not amount to less than 10%, preferably not less than 20% of the weight of the fibres. On the other hand, no significant benefits are achieved if 40% of the fiber weight is exceeded, hardly even 30%.
I nedenstående eksempel vises hvorledes de for oppfinnelsen karakteristiske trekk medforer betydelig effekt angående de for mineralfiberbanen avgjbrende egenskaper. Det er imidlertid underforstått at oppfinnelsen også kan tilpasses på andre måter innenfor rammen av kravene. In the example below, it is shown how the features characteristic of the invention have a significant effect regarding the essential properties of the mineral fiber web. However, it is understood that the invention can also be adapted in other ways within the framework of the requirements.
Eksempel 1Example 1
En fibersuspensjon bestående av 0,1% stenullfibre i vann tilsettes 15% akrylatlateks, beregnet i forhold til fibervekten, hvilken lateks man umiddelbart for har fått til å koagulere ved pH-senk-ning med alunopplosning. Den bindemiddelholdige fibersuspensjon ble avvannet på en planvire "Voith Hydroformer". Efter avvanning til 40% torrsubstans ble ca. 10% styren-butadien-lateks regnet i forhold til fibervekten påsproytet. Arket ble innfort på en torkesylinder med 1 m diameter hovedsakelig omgitt av en vire, hvis spenning var regulerbar. Banen, ble tbrket og provet med hensyn til strekkfasthet og inntrykksbestandighet .Fblgende resultat ble oppnådd: A fiber suspension consisting of 0.1% rock wool fibers in water is added to 15% acrylate latex, calculated in relation to the fiber weight, which latex is immediately caused to coagulate by lowering the pH with alum solution. The binder-containing fiber suspension was dewatered on a plane wire "Voith Hydroformer". After dewatering to 40% dry matter, approx. 10% styrene-butadiene-latex calculated in relation to the fiber weight sprayed on. The sheet was inserted into a drying cylinder with a diameter of 1 m mainly surrounded by a wire, the tension of which was adjustable. The web was used and tested with regard to tensile strength and impact resistance. The following results were obtained:
Den bane som ble meget komprimert under tbrking (prove B) frem- viste således vesentlig bedre strekkfasthetsverdier enn den som ble ubetydelig komprimert (A). The web that was highly compressed during use (sample B) thus showed significantly better tensile strength values than the one that was slightly compressed (A).
^ en stålkule 20 mm 0 belaster banen i 5-min. og inntrykket måles. Efter avlasting 5 min. måles inntrykket igjen. ^ a steel ball 20 mm 0 loads the track for 5 min. and the impression is measured. After unloading 5 min. the impression is measured again.
Eksempel 2Example 2
Ved et forsok i prinsippet ifolge eksempel 1 ble folgende varia-sjoner foretatt i bindemiddelbetingelsene. In an experiment in principle according to example 1, the following variations were made in the binder conditions.
Claims (12)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7608399A SE397338B (en) | 1976-07-23 | 1976-07-23 | PROCEDURE FOR MANUFACTURING A PATTERN MAINLY CONSISTING OF MINERAL FIBERS AND BINDERS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO772290L true NO772290L (en) | 1978-01-24 |
Family
ID=20328537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO772290A NO772290L (en) | 1976-07-23 | 1977-06-28 | PROCEDURE FOR MAKING A MINERAL FIBER PATH |
Country Status (9)
| Country | Link |
|---|---|
| BE (1) | BE856906A (en) |
| CA (1) | CA1065659A (en) |
| DE (1) | DE2732414A1 (en) |
| DK (1) | DK333677A (en) |
| FI (1) | FI56863C (en) |
| FR (1) | FR2359232A1 (en) |
| NL (1) | NL174573C (en) |
| NO (1) | NO772290L (en) |
| SE (1) | SE397338B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4389282A (en) * | 1982-08-06 | 1983-06-21 | Combustion Engineering, Inc. | Ceramic fiber board |
| DE3314373A1 (en) * | 1983-04-20 | 1984-10-25 | Basf Ag, 6700 Ludwigshafen | SOUND INSULATION PANELS BASED ON MINERAL FIBERS AND THERMOPLASTIC BINDERS |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE501107A (en) * | 1950-02-09 | |||
| US2772603A (en) * | 1950-09-12 | 1956-12-04 | Owens Corning Fiberglass Corp | Fibrous structures and methods for manufacturing same |
| US2905584A (en) * | 1955-05-25 | 1959-09-22 | Johnson & Johnson | Process for making a unified fibrous web |
| US3097990A (en) * | 1961-01-16 | 1963-07-16 | Armstrong Cork Co | Polytetrafluoroethylene saturated crocidolite fiber product |
| CA958508A (en) * | 1970-01-20 | 1974-12-03 | Martyn Aartsen | Fibre treatment process |
| FR2187975B1 (en) * | 1972-06-06 | 1976-08-06 | Non Tisses Ste Fse |
-
1976
- 1976-07-23 SE SE7608399A patent/SE397338B/en not_active IP Right Cessation
- 1976-08-17 FI FI762350A patent/FI56863C/en not_active IP Right Cessation
-
1977
- 1977-06-14 NL NLAANVRAGE7706516,A patent/NL174573C/en not_active IP Right Cessation
- 1977-06-22 CA CA281,152A patent/CA1065659A/en not_active Expired
- 1977-06-28 NO NO772290A patent/NO772290L/en unknown
- 1977-07-18 DE DE19772732414 patent/DE2732414A1/en not_active Ceased
- 1977-07-18 BE BE179429A patent/BE856906A/en not_active IP Right Cessation
- 1977-07-20 FR FR7722227A patent/FR2359232A1/en active Granted
- 1977-07-22 DK DK333677A patent/DK333677A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL7706516A (en) | 1978-01-25 |
| FI56863C (en) | 1980-04-10 |
| FI56863B (en) | 1979-12-31 |
| CA1065659A (en) | 1979-11-06 |
| NL174573B (en) | 1984-02-01 |
| FI762350A7 (en) | 1978-01-24 |
| DE2732414A1 (en) | 1978-01-26 |
| NL174573C (en) | 1984-07-02 |
| BE856906A (en) | 1977-11-14 |
| FR2359232A1 (en) | 1978-02-17 |
| FR2359232B1 (en) | 1983-03-18 |
| SE397338B (en) | 1977-10-31 |
| DK333677A (en) | 1978-01-24 |
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