DK141255B - Mechanical wood pulp, which is readily dispersible in water and has a high absorption rate, and process for its preparation. - Google Patents
Mechanical wood pulp, which is readily dispersible in water and has a high absorption rate, and process for its preparation. Download PDFInfo
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- DK141255B DK141255B DK406775AA DK406775A DK141255B DK 141255 B DK141255 B DK 141255B DK 406775A A DK406775A A DK 406775AA DK 406775 A DK406775 A DK 406775A DK 141255 B DK141255 B DK 141255B
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- pulp
- mechanical
- absorption rate
- water
- mass
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/38—Conserving the finely-divided cellulosic material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- Materials Engineering (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Hematology (AREA)
- Paper (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Description
(11) FREMUE66ELSESSKRIFT 141255 DANMARK <»'> int.ci.s d 21 h 3/00 §(21) Ansøgning nr. 4067/75 (22) Indltveretdon 11. ββρ. 1975 (28) Løbedag 11. ββρ. 1975 (44) Ansøgningen fremlagt og fremleeggelseeekrifW offentliggjort dan 11. f eb. 1 98Ο(11) FOREIGN EXPRESSION 141255 DENMARK <»'> int.ci.s d 21 h 3/00 § (21) Application No. 4067/75 (22) Indltveretdon 11. ββρ. 1975 (28) Race day 11. ββρ. 1975 (44) The application presented and submitted in publication 11 th eb. 1 98Ο
Dl REKTORATET FORDl THE RECTORATE FOR
PATENT-OG VAREMÆRKEVÆSENET (*» Prioritet bagwat fra danPATENT AND TRADE MARKET (* »Priority bagwat from dan
12. sep. 1974, 745286, NOSep 12 1974, 745286, NO
<71> PAPIRINDUSTRIENS PORSKNINGSINSTITUTT, Forskningsveien 5, Oslo 5, NO.<71> PAPER INDUSTRY'S RESEARCH INSTITUTE, Forskningsveien 5, Oslo 5, NO.
(72) Opfinder: Nicolai Soteland, Incognito Terrasse 5b, Oslo 2, NO.(72) Inventor: Nicolai Soteland, Incognito Terrace 5b, Oslo 2, NO.
(74) Fuldmægtig under «agens behandling:(74) Plenipotentiary 'agent':
Kontor for Induetriel Eneret v. Svend Schønnlng.Office of Induetriel Eneret v. Svend Schønnlng.
(B4) Mekanisk træmasse som er let opsplittelig i vand og har høj absorp« tionshastighed, og fremgangsmåde ved fremstilling deraf.(B4) Mechanical wood pulp, which is readily divisible in water and has a high absorption rate, and process for its preparation.
Den foreliggende opfindelse angår mekanisk træmasse som er let opsplittelig i vand og har høj absorptionshastighed, og en fremgangsmåde ved fremstilling deraf.The present invention relates to mechanical wood pulp which is readily dispersible in water and has a high absorption rate, and a process for its preparation.
Mekanisk masse er en fællesbetegnelse for massetyper vundet ved mekanisk defibrering af forskellige slags træ eller ved, fx ved hjælp af slibestene eller skiveraffinører,' eventuelt efter en mild kemikaliebehandling.Mechanical pulp is a common term for pulp types obtained by mechanical defibration of various kinds of wood or by, for example, using abrasive stones or disc refiners, possibly after a mild chemical treatment.
Mekanisk masse er billigere end celluiosemasser vundet ved kemisk oplukning af ved, dels fordi kemikalier spares, dels fordi udbyttet i forhold til råmaterialet bliver større og derfor har sådanne mekaniske masser fået bred anvendelse 141255 2 som råstof ved fremstilling af avispapir, magasinpapir eller lignende. Da slibemassen imidlertid udviser den uheldige egenskab, at den undergår "selvlimning" ved lagring, har det tidligere været nødvendigt at opbevare og transportere mekanisk masse i fugtig tilstand eller at tørre den på en speciel måde, fx ved den såkaldte "flash-tørremetode". Som følge af selvlimningen vil mekanisk masse efter lagring udvise mere eller mindre hydrofobe egenskaber i afhængighed-af lagringstiden, harpiksindholdet, oplagringsbetingelserne og lignende forhold, hvilket gør en videre håndtering af en sådan masse vanskelig når den skal forædles videre.Mechanical pulp is less expensive than cellulose pulp obtained by chemical absorption of wood, partly because chemicals are saved and partly because the yield relative to the raw material is increased and therefore such mechanical pulpes have been widely used as raw material in the production of newsprint, magazine paper or the like. However, since the abrasive mass exhibits the unfortunate property of undergoing "self-bonding" upon storage, it has previously been necessary to store and transport mechanical pulp in a moist state or to dry it in a special way, for example by the so-called "flash drying method". As a result of the self-bonding, mechanical mass after storage will exhibit more or less hydrophobic properties in dependence on the storage time, resin content, storage conditions and similar conditions, making further handling of such mass difficult to process further.
På grund af selvlimning er mekanisk masse kun i beskedent omfang blevet anvendt til absorptionsformål i fx bleer, hygiejne« bind, tamponer håndklæder og lignende produkter, og til sådanne formål har højforædlede, blegede celluloser stort set været enerådende.Due to self-adhesion, mechanical mass has only been used to a limited extent for absorption purposes in, for example, diapers, sanitary napkins, tampons towels and similar products, and for such purposes, highly processed, bleached celluloses have been largely unavoidable.
Hvis harpiksen kan fjernes fra den mekaniske masse, har det vist sig at mekanisk masse med fordel også kan anvendes til de ovennævnte formål som angivet i norsk patentskrift nr. 124.193. Ifølge dette kan harpiksen fjernes fra massen fx ved ekstraktion med acetone, hvorved der vindes et produkt med gode absorptions-egenskaber. Imidlertid er en industriel ekstraktionsproces en temmelig kompliceret og fordyrende proces, der kræver stor kapitalinvestering i ekstraktionsudstyr og genvindingsudstyr m.m. Acetoneekstraktion af mekanisk masse har også tidligere været foreslået for at forbedre den mekaniske masses styrkeegenskaber og for at gøre massen lettere opsplittelig i den efterfølgende forædlingsproces (Brandal & Lindheim, Pulp & Paper Mag. Can 67 T 431, 1966).If the resin can be removed from the mechanical pulp, it has been found that mechanical pulp can advantageously also be used for the above-mentioned purposes as disclosed in Norwegian Patent No. 124,193. According to this, the resin can be removed from the pulp, for example, by extraction with acetone, whereby a product having good absorption properties is obtained. However, an industrial extraction process is a rather complicated and costly process that requires a great deal of capital investment in extraction equipment and recycling equipment, etc. Acetone extraction of mechanical pulp has also previously been proposed to improve the strength properties of the mechanical pulp and to make the pulp more easily digestible in the subsequent refining process (Brandal & Lindheim, Pulp & Paper Mag. Can 67 T 431, 1966).
Det har nu overraskende vist sig at det er muligt at behandle en mekanisk masse på en sådan måde at den ved ældning bibeholder sine oprindelige hydrofile egenskaber således at en mekanisk masse behandlet i henhold til den foreliggende opfindelse ved lagring vil forblive hydrofil og således let at splitte op ved den efterfølgende forædling. Det har yderligere vist sig at en sådan masse er udmærket egnet til.absorptionsformål, og. det til trods for at den heromhandlede ny behandlingsmåde i ringe grad påvirker den mekaniske masses harpiksindhold. Ifølge opfindelsen er den mekaniske masse ejendommelig ved at indeholde mindst 0,2 og for- 141255 3 trinsvis mindst 0,5 vægt%, regnet på den tørre masse, af en pufferkomponent som pufrer i området pH 6-10, fortrinsvis 7-9. Pufferen er fortrinsvis ikke-boratholdig; borat gør i og for sig ingen skade i massen, men boratholdige puffere giver ret svag effekt.It has now surprisingly been found that it is possible to treat a mechanical pulp in such a way that it retains its original hydrophilic properties in aging so that a mechanical pulp treated in accordance with the present invention will remain hydrophilic and thus easily split up at the subsequent processing. It has further been found that such a mass is very suitable for absorption purposes, and. this despite the fact that the new method of treatment in question has little effect on the resin content of the mechanical mass. According to the invention, the mechanical mass is characterized by containing at least 0.2 and preferably at least 0.5% by weight, based on the dry mass, of a buffer component which buffers in the range of pH 6-10, preferably 7-9. The buffer is preferably non-borate; borate does not in itself do any damage to the mass, but borate-containing buffers give quite a weak effect.
Opfindelsen angår som nævnt også en fremgangsmåde ved fremstilling af den omhandlede mekaniske masse, og den er ejendommelig ved at der til mekanisk masse sættes mindst 0,2 vægt% af en ikkeboratholdig puffersubstans som pufrer i pH-området 6-10, fortrinsvis 7-9. Egnede puffere er alkalimetalsalte og ammoniumsalte af fx fosforsyre, karbonsyre, citronsyre eller vinsyre.The invention also relates, as mentioned, to a process for preparing the present mechanical mass, and it is characterized in that at least 0.2% by weight of a non-borate buffer substance buffered in the pH range 6-10, preferably 7-9, is added to the mechanical mass. . Suitable buffers are alkali metal salts and ammonium salts of, for example, phosphoric acid, carbonic acid, citric acid or tartaric acid.
En sådan behandling af den mekaniske masse med en vandig opløsning af pufferen er meget billig og simpel at udføre. Tilsætningen kan ske på flere steder under fremstilling af den mekaniske masse, i afhængighed af produktets anvendelsesområde og af tilgængeligt udstyr. Tilsætningen kan fx ske under massefremstilling i raffinør eller slibestol, i papirmaskinens bagvandssystem, i limpressen, ved påsprøjtning under eller efter arkdannelsen, ved indsprøjtning i massen før den evt. omdannes til masseballer. Denne nye behandlingsmåde kan således udføres med tilgængeligt udstyr og kan således tillempes i allerede eksisterende produktionsanlæg.Such treatment of the mechanical mass with an aqueous solution of the buffer is very cheap and simple to perform. The addition can take place in several places during the manufacture of the mechanical pulp, depending on the scope of the product and on available equipment. The addition can be done, for example, during mass production in refiner or grinding chair, in the paper machine's backwater system, in the glue press, by spraying during or after sheet formation, by injection into the pulp before it can be used. transforms into mass balls. This new treatment method can thus be carried out with available equipment and can thus be applied in pre-existing production plants.
Ved den ny fremgangsmåde vil man fx kunne fremstille absorberende materialer ud fra mekaniske masser, hvilket betyder væsentlige besparelser i forhold til højforædlede celluloseprodukter. Set under synsvinkelen ressourcehensyn og miljøhensyn repræsenterer den foreliggende fremgangsmåde store og umiddelbart indlysende fordele.'For example, in the new process, it will be possible to produce absorbent materials from mechanical masses, which means significant savings over highly processed cellulose products. Viewed from the point of view of resource and environmental considerations, the present approach represents major and immediately obvious benefits. '
Fremgangsmåden ifølge opfindelsen skal i det følgende belyses nærmere ved nogle eksempler, der viser effekten af den nye behandlingsmåde.The method according to the invention will be illustrated in the following by some examples which show the effect of the new method of treatment.
Forskellige massetyper blev behandlet med pufferen både ved påsprøjtning og neddypning i pufferopløsningen. Massernes tørstofindhold før behandlingen eller påsprøjtningen med pufferopløsningen varierede mellem 25¾ og 90¾ kulstof. Efter behandlingen blev massen tørret i en cyklon og fluffet (i en Wenneberg-mølle).Various mass types were treated with the buffer both by spraying and immersion in the buffer solution. The dry matter content of the masses prior to treatment or spraying with the buffer solution varied between 25¾ and 90¾ carbon. After treatment, the pulp was dried in a cyclone and fluffed (in a Wenneberg mill).
141255 4141255 4
En del af den således pufferbehandlede og fluffede masse blev kunstigt ældet ved 105°C i 1 time, hvorefter massen henstod i 30 - 60 min. ved stuetemperatur før den ældede masses vandabsorption blev bestemt. Vandabsorptionen for ikke-ældet masse og for ikke-behand-let masse blev også bestemt.Part of the buffered and fluffed mass thus artificially aged at 105 ° C for 1 hour, after which the mass was allowed to stand for 30 - 60 minutes. at room temperature before the water absorption of the aged mass was determined. The water absorption for non-aged pulp and for non-treated pulp was also determined.
Bestemmelsen af vandabsorptionshastigheden blev ved disse forsøg udført ved at 10 g lufttør, fluffet masse fordeltes jævnt i et metalnet (metalkurv med dimensionerne 7 x 20 x 1 cm), som blev anbragt i en beholder indeholdende 200 ml vand. Den tid det tager fra det øjeblik metalnettet anbringes i beholderen, til al masse er gennemfugtet med vand, er et mål for massens vandabsorptionshastighed.The determination of water absorption rate was carried out in these experiments by distributing 10 g of air-dry, fluffy pulp evenly in a metal mesh (metal basket of dimensions 7 x 20 x 1 cm) which was placed in a container containing 200 ml of water. The time it takes from the moment the metal mesh is placed in the container until all the mass is soaked with water, is a measure of the water absorption rate of the mass.
Resultaterne fremgår af omstående tabel.The results are shown in the table below.
Som det ses af disse resultater, opnås der ved behandlingen ifølge opfindelsen en betydelig forbedret vandabsorptionshastighed i forhold til ikke-behandlet masse. En undtagelse er dog boratpufferen, der tilsyneladench for ikke-ældet masse har en nedsættende virkning på absorptionshastighed, hvorimod det efter ældningen viser sig at ældet, boratpufferbehandlet masse udviser større absorp-tionshasighed end ikke-behandlet masse.As can be seen from these results, the treatment according to the invention achieves a significantly improved water absorption rate compared to untreated pulp. An exception, however, is the borate buffer, which appears to have a decrease in absorption rate for non-aged pulp, whereas after aging it appears that aged, borate buffer-treated pulp exhibits greater absorption rate than non-treated pulp.
Det ses yderligere at masser behandlet med de andre puffere med hensyn til vandabsorptionshastigheden næsten ikke påvirkes ved kunstig ældning, idet en forskel på 1 sek. ligger godt indenfor fejlgrænsen ved denne specielle prøvemetodik.It is further seen that masses treated with the other buffers in terms of water absorption rate are hardly affected by artificial aging, with a difference of 1 sec. is well within the error range of this particular test methodology.
Til sammenligning kan det nævnes at en højforædlet cellulose under de tilsvarende betingelser udviser en vandabsorptionshastighed af størrelsesordenen 5 sek.By comparison, under the corresponding conditions, a highly processed cellulose exhibits a water absorption rate of the order of 5 sec.
De mekaniske masser fremstillet i henhold til den foreliggende opfindelse er således med hensyn til vandabsorptionshastighed sammenlignelige med højforædlede cellulosemasser og da de yderligere bevarer deres hydrofile egenskaber ved ældning, kan de let opsplittes ved en evt. videreforædling, fx i en papirfabrik som anvender mekanisk masse som råprodukt.Thus, the mechanical masses produced in accordance with the present invention are comparable in water absorption rate to highly refined cellulosic masses and as they further retain their hydrophilic properties in aging, they can be readily decomposed by an option. further processing, for example in a paper mill which uses mechanical pulp as a raw product.
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO743286 | 1974-09-12 | ||
| NO743286A NO136583C (en) | 1974-09-12 | 1974-09-12 | MECHANICAL TRIMASSES WITH HIGH SPEED OF ABSORPTION, AND PROCEDURE FOR PREPARING THEREOF |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK406775A DK406775A (en) | 1976-03-13 |
| DK141255B true DK141255B (en) | 1980-02-11 |
Family
ID=19881821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK406775AA DK141255B (en) | 1974-09-12 | 1975-09-11 | Mechanical wood pulp, which is readily dispersible in water and has a high absorption rate, and process for its preparation. |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5184904A (en) |
| AT (1) | AT347781B (en) |
| BE (1) | BE833343A (en) |
| CA (1) | CA1073162A (en) |
| DE (1) | DE2539570C3 (en) |
| DK (1) | DK141255B (en) |
| FI (1) | FI59444C (en) |
| FR (1) | FR2284706A1 (en) |
| GB (1) | GB1515865A (en) |
| IT (1) | IT1049168B (en) |
| NL (1) | NL7510763A (en) |
| NO (1) | NO136583C (en) |
| SE (1) | SE418873B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE432118B (en) * | 1975-02-26 | 1984-03-19 | Moelnlycke Ab | MECHANICAL FLUFF MASS AND SET FOR PREPARATION THEREOF |
| NO760666L (en) * | 1976-02-27 | 1977-08-30 | Papirind Forskningsinst | PROCEDURE FOR MAKING MECHANICAL MASSES. |
| PH13425A (en) * | 1976-05-10 | 1980-04-23 | Du Pont | 2,3,8,12b-tetrahydro 1 h-3a,8-methano-dibenzo(3,4,6,7)cyclohepta(1,2-c)pyrrole derivatives pharmaceutical compositions containing same and method |
| DE3128100C2 (en) * | 1981-07-16 | 1986-05-22 | Chemische Fabrik Stockhausen GmbH, 4150 Krefeld | Absorbents for blood and serous body fluids |
| DE3712445A1 (en) * | 1987-04-11 | 1988-10-20 | Ver Papierwerke Ag | HYGIENIC PULP PRODUCT WITH IMPROVED SKIN COMPATIBILITY |
-
1974
- 1974-09-12 NO NO743286A patent/NO136583C/en unknown
-
1975
- 1975-09-05 AT AT688175A patent/AT347781B/en active
- 1975-09-05 DE DE2539570A patent/DE2539570C3/en not_active Expired
- 1975-09-08 CA CA234,947A patent/CA1073162A/en not_active Expired
- 1975-09-10 IT IT12785/75A patent/IT1049168B/en active
- 1975-09-10 FR FR7527764A patent/FR2284706A1/en active Granted
- 1975-09-11 DK DK406775AA patent/DK141255B/en not_active Application Discontinuation
- 1975-09-11 SE SE7510158A patent/SE418873B/en not_active Application Discontinuation
- 1975-09-11 FI FI752552A patent/FI59444C/en not_active IP Right Cessation
- 1975-09-12 NL NL7510763A patent/NL7510763A/en not_active Application Discontinuation
- 1975-09-12 BE BE159977A patent/BE833343A/en not_active IP Right Cessation
- 1975-09-12 JP JP50110115A patent/JPS5184904A/ja active Pending
- 1975-09-12 GB GB37605/75A patent/GB1515865A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA1073162A (en) | 1980-03-11 |
| NO743286L (en) | 1976-03-15 |
| NO136583B (en) | 1977-06-20 |
| BE833343A (en) | 1975-12-31 |
| SE418873B (en) | 1981-06-29 |
| DE2539570C3 (en) | 1980-02-14 |
| AT347781B (en) | 1979-01-10 |
| SE7510158L (en) | 1976-03-15 |
| ATA688175A (en) | 1978-05-15 |
| FI752552A (en) | 1976-03-13 |
| DE2539570B2 (en) | 1979-06-13 |
| DE2539570A1 (en) | 1976-04-01 |
| FI59444B (en) | 1981-04-30 |
| NL7510763A (en) | 1976-03-16 |
| GB1515865A (en) | 1978-06-28 |
| NO136583C (en) | 1984-06-07 |
| IT1049168B (en) | 1981-01-20 |
| DK406775A (en) | 1976-03-13 |
| AU8455175A (en) | 1977-03-10 |
| FR2284706B1 (en) | 1982-04-23 |
| FI59444C (en) | 1981-08-10 |
| FR2284706A1 (en) | 1976-04-09 |
| JPS5184904A (en) | 1976-07-24 |
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