Classifications

• • 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
  • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
  • C04B20/10—Coating or impregnating
  • C04B20/1018—Coating or impregnating with organic materials
  • C04B20/1022—Non-macromolecular compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/00987—Apparatus or processes for manufacturing non-adhesive dressings or bandages
  • A61F13/00991—Apparatus or processes for manufacturing non-adhesive dressings or bandages for treating webs, e.g. for moisturising, coating, impregnating or applying powder
• • 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
  • A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
• • 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
• • 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
  • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
  • A61L15/28—Polysaccharides or their derivatives
• • 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
  • A61L15/42—Use of materials characterised by their function or physical properties
  • A61L15/48—Surfactants
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/02—Processes; Apparatus
  • B27K3/0207—Pretreatment of wood before impregnation
  • B27K3/0214—Drying
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/02—Processes; Apparatus
  • B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
  • B27K5/001—Heating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
  • B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
  • B27K5/04—Combined bleaching or impregnating and drying of wood
• • 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
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/18—Waste materials; Refuse organic
  • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
• • 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
  • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
  • C04B20/02—Treatment
• • 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
  • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
  • C04B20/10—Coating or impregnating
  • C04B20/1055—Coating or impregnating with inorganic materials
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/32—Materials not provided for elsewhere for absorbing liquids to remove pollution, e.g. oil, gasoline, fat
• • 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
  • D21B1/02—Pretreatment of the raw materials by chemical or physical means
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
  • D21C1/00—Pretreatment of the finely-divided materials before digesting
  • D21C1/10—Physical methods for facilitating impregnation
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
  • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
  • D21C9/001—Modification of pulp properties
• • 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
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/12—Organo-metallic compounds
• • 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
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/40—Surface-active agents, dispersants
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to a method of treating a material including fibers each having inner and/or outer su rface parts defin ⁇ ing interstices or voids, so as to impart desi red characteristics to such fibers .
• the fibers may be natural fibers having inner cavities or cell cavities, for example cellulose fibers or wool fibers , or they may be man-made fibers having such inner cavities or outer su rface parts defining interstices or voids .
• Such artificial fibers may, for example, have a cross-sectional shape with projections defining spaces therebe ⁇ tween, and/or the fibers may have a "curled" configuration resulting in many inter-fiber voids in the material .
• the material may be a fibrous cellulose material, such as straw, wood waste, or other wooden material, or it may be a fibrous sheet or web .
• material such as composite paper or woven or non-woven textile material .
• the method according to the invention comprises exposing the material to a heating and/or drying treatment and thereafter compressing the material sufficiently to at least pa rtly compress the interstices or voids .
• the compression may be carried out in any suit ⁇ able manner, for example by means of hydraulic or mechanical pres ⁇ ses .
• the fibers in order to obtain the compression of the interstices or cavities defined by the single fibers and/or present between the fibers, it is necessary to expose the fibers to extremely high pres ⁇ su res which may best be obtained by subjecting the material to a rolling treatment, for example by passing the fibrous material th rough a nip defined between a roller and a suitable countersurface while the roller and the countersurface are being pressed together at an ex- tremely high pressure.
• the countersu rface may be stationary and have a plane or cu rved shape.
• the rolling treatment is, however, preferably performed by passing the fibrous material th rough the nip defined between a cooperating pair of rollers .
• OMPI includes natural fibers, the material is preferably compressed suf ⁇ ficiently to permanently deform the cell walls of at least some of these fibers .
• the fibrous material such as straw, veneer, wood waste, or other wooden material , or pulp, cardboard, or pasteboard
• the fibers are subjected to a certain crushing, whereby the fineness of the fibers as expressed by the SR of the fibers, is substantially increased so that the treated material may be pulped without further treatment and be used for the production of for example grease proof paper, parchment paper, and the like.
• the pressure in the nip area defined between a cooperating pair of rollers may typically
• pressu re will be between 1000 and 10,000 kp/cm , such as between 2000 and 10,000 kp/cm ⁇ or even between 5000 and 10,000 kp/cm 2 .
• a liquid substance is supplied to the material prior to or during the compression or rolling treatment.
• the liquid substance may, for example, be a substance which may impart desired characteristics to the fibers, such as an impregnating or modification agent or a combination of impregnating or modification agents to impart desired properties to the fibers, or it may be a liquid substance which is later on substantially evaporated, but which functions solely as a lubricant; vide below.
• this substance When the fibrous material is exposed to a compression or rolling treatment as described above with an effective amount of a liquid substance present, this substance will function as a lubricant, where- by crushing of the fibers may be avoided .
• gas such as air
• This compression or rolling treatment causes a very even distribution of the liquid substance in the fibrous mass and an intimate contact between the liquid substance and the single fibers .
• the fibers have a certain resiliency which causes that after the compression or rolling treatment the flattened fibers tend to return at least partly to their original shape, whereby the original cavities and voids within the fibers and/or between the fibers will partly be re ⁇ established .
• this substance will then be sucked into the cavities wh ereby the contact su rface between the liquid and the fibers is further increased .
• one aspect of the method according to the invention may be considered as a continuous treatment of a fibrous mass, in which method the mass is subjected to compression under a high pressu re and subsequent relief in the presence of a liquid substance so as to provide a pressu re/vacuum effect causing at least partial filling of the interstices or voids defined by and/or between the fibers with the liquid substance.
• the energy supplied to the rollers is partly converted into heat in the nip area, and the resulting increased temperatu re in that area promotes possible chemical reactions between the liquid substance and the fibers during the rolling treatment.
• the rolling treatment per se also causes a chemical-physical change of the amorphous structu re of cellulose fibers , possibly include ⁇ ding the formation of hydrogen cross-links between the cellulose chains .
• any moistu re present in the material prior to the supply of the liquid will counteract the obtainment of satisfactory good contact or affinity between the fibers and the liquid substance.
• liquid substance which liquid substance may contain water
• fibrous material is exposed to a heating and/or drying treatment prior to the application of liquid substance and/or compression treatment, preferably an intensive heating treat- ment. It is desirable to obtain a drying to a dry matter content of the fibrous material of more than 98%, preferably as much as 99%, and especially in a range of about 99.1-99.999%, expressed, e. g . , as reactive cellulose hydroxy groups relative to the theoretical amount thereof.
• the heating temperature is preferably chosen as high as it is possible without damaging or deteriorating the fibrous material (and without removing any crystal water present in components of the fibrous material) .
• the temperature to which the fibrous material is heated is preferably 100-275°C, in particular 120-250°C, preferably about 160-220°C, more preferably 180-200°C.
• a drying to more than 98%, preferably as much as 99%, and especially in a range of 99. 1 - 99.999%, is aimed at.
• Such drying must be presumed also to break even the monomoiecular layer of water bound to the fiber surface and will render the cellulose more reactive with any substance capable of reacting with cellulose hydroxy groups .
• the heating of cellulose fibers is an essential feature which is believed to result in a soften- ing of the lignin content of the cellulose fibers, which softening is believed to enhance the penetration of liquid substance (when used) into the fibers and to contribute to reduction of the "brittleness" of the cellulose fibers and hence to reduce the danger that the cellulose fibers will be damaged du ring the compression treatment.
• the heating of the fibrous material may be performed by means of infrared irradiation, e. g. by means of infrared heating means irra ⁇ diating the fibrous material supplied to the treatment, by high fre- quency treatment of the fibrous material, or by passing the fibrous material th rough heated, dry atmospheric air or heated, dry oxy ⁇ gen-free gas or gas mixture, or by a combination of these measures .
• the compression of the fibers may be obtained by passing the fibrous mass through the nip of a single pair of compression rollers at suit- ably low speed .
• the rollers are rotated so that their cylin ⁇ drical surface parts defining the nip area are moved in the same di rection and at the same velocity.
• the rollers may be rotated so that the velocities of the roller parts defining the nip area are different from each other, and these roller parts may even be moved in opposite di rections .
• the compression treatment imparted to the fibrous material is dependent on the rotational speed of the rol ⁇ lers, the roller diameters , and the thickness of the web or layer of material supplied to the nip area of the rollers .
• the material may be passed th rough the nips of two or more consecutive pairs of rollers .
• two consecutive pairs of rollers may be consti ⁇ tuted by th ree rollers , of which one (the intermediate roller) coope- rates with the two other rollers to define a nip with each of the two other rollers.
• the consecutive pairs of rollers may define decreasing nip area spaces and/or be pressed together by forces increasing in the moving direction of the material being treated.
• the use of several pairs of rollers improves the distribution of the liquid substance in the fibrous mass .
• the liquid substance and/or further liquid or part ⁇ culate additives such as described in greater detail below, may be applied to the material between two adjacent pairs of rollers .
• the liquid substance may be applied to the fibrous material in any suitable manner, for example by passing the material through a bath of the liquid substance.
• the liquid substance is sprayed on to the fibrous material, preferably by an airless spray technique, for example by means of one or more nozzles.
• the nozzle or nozzles may tend to become clogged.
• Another interesting embo ⁇ diment comprises adding the liquid substance from the surface of one of the rollers, e. g . by having the roller partially immersed in a bath of the liquid substance.
• the liquid substance is preferably applied to the fibrous material in a metered amount slightly exceeding the neces ⁇ sary amount, and excessive liquid will then be removed from the fibrous material when this material is passed through the first pair of rollers .
• One way of supplying a metered amount of the liquid sub- stance to the fibrous material comprises applying the liquid substance at a controlled rate to one or both of the rollers, e. g . , by means of an applicator roller or by spraying .
• thermoelectric material it may be advantageous to obtain a substantially increased temperature at the nip area between the pair or pairs of rollers .
• This temperature may be further increased by heating at least one of the rollers used in the rolling treatment. If the liquid substance is of a type solidifying at room temperatu re, heating of the roller or rollers also counteracts or prevents the building up of solidified substance on the roller surface or surfaces .
• the fibrous material may be fu rther treated and defibrated in a defibration or fluffing device.
• the defibration device may be a wet defibration device such as a pulper or a dry defibration or fluffing device such as a hammer mill . It has been found that by subjecting a fibrous material to a high pressure compression or rolling treatment as described above and to a succeeding treatment in a hammer mill, an exceptionally homogeneous defibrated product without lumps or fiber agglomerates may be ob ⁇ tained . If desired, further liquid, particulate, and/or pulverulent additives may be added to the fibers during treatment in the hammer mill, such as described in greater detail below.
• the fibers When the fibrous mass is compressed in a dry condition , i. e. without addition of a lubricating liquid substance, and is subsequently treated in a fluffing device, such as a hammer mill, the fibers may be dete ⁇ riorated because of the high temperatures caused by the mechanical treatment of the fibers . It has been found that this deterioration may be controlled or even avoided when a suitable lubricant, for example kerosene or ethanol (or any other liquid substance, e. g. an impreg ⁇ nating agent) , is added to the fibrous material before it is introduced into and/or while it is being treated in the fluffing device. The addition of such a lubricant seems to reduce the proportion of kinetic energy converted into heat energy, and the lubricant will also to some extent serve as a coolant.
• a suitable lubricant for example kerosene or ethanol (or any other liquid substance, e. g. an impreg ⁇
• the invention also relates to an apparatus for use in carrying out the method described above, the apparatus comprising rolling means including at least one pair of rollers , supply means for supplying a sheet or web of fibrous material to the nip defined between the pair of rollers , and heating and/or drying means for heating and/or dry ⁇ ing the fibrous material supplied .
• the apparatus also comprises means for applying a liquid substance to the fibrous mate-
• vf ⁇ rial at a position upstream of the rolling means or for applying a liquid substance to the rolling means, and means for defibrating, in particular dry defibrating, the fibrous material downstream of the rolling means, especially a hammer mill .
• the invention also relates to a fibrous material comprising fibers having cell walls permanently deformed by compression .
• Fig. 1 diagrammatically illustrates an apparatus or a plant for treating a fibrous material in accordance with the present invention.
• Fig. 2 is an enlarged view illustrating rolling of a fiber at an ex ⁇ tremely high rolling pressure
• Ffg. 3 is a perspective view illustrating in greater detail an apparatus or a plant as that shown in Fig . 1 , Fig . 4 diagrammatically illustrates a more compact embodiment of the plant or apparatus.
• Fig . ,4a diagrammatically illustrates a modification of the apparatus shown in Fig . 4,
• Fig . 5 is a side view diagrammatically illustrating a third embodiment of an apparatus for treating straw, wooden chips, and similar starting materials, and
• Fig . 6 is a perspective view in an enlarged scale illustrating rolling of a plate material made from a number of plate members which have been joined together.
• Fig. 7 is a scanning electron microscopy photo showing a treated fibrous web with an impregnating agent distributed therein,
• Fig . 8 is a scanning electron microscopy photo showing the character of the treated fibers
• Figs . 9 and 10 show single fibers treated in accordance with the present invention and thereafter extracted with dichloromethane, and
• Figs . 11 and 12 show fibers treated in accordance with the invention and thereafter extracted with dichloromethane (Fig . 11 ) and not extracted (Fig . 12) , respectively.
• Fig . 1 diagrammatically illustrates a plant or an apparatus for treating a fibrous cellulose material in the form of a web 10, which is fed continuously from a supply roll 11 to a rolling device 12 comprising at least one pair of high pressu re rollers 12' .
• the fibrous web material passes a heating and drying device 13 which is interposed between the supply roll 11 and a liquid applicating device 14 comprising a liquid reservoi r 15 and a spraying nozzle 16 which is positioned so that a liquid substance contained in the reservoir 15 may be sprayed on to the web material 10 at a position downstream of the heating and drying device 13 and upstream of the rolling device 12.
• a heating and drying device 13 which is interposed between the supply roll 11 and a liquid applicating device 14 comprising a liquid reservoi r 15 and a spraying nozzle 16 which is positioned so that a liquid substance contained in the reservoir 15 may be sprayed on to the web material 10 at a position downstream of the heating and drying device 13 and upstream of the rolling device 12.
• the fibrous web is compressed under an extremely high pressure which is sufficient to deform the cell walls of the single fibers and to compress the cell cavities 17 therein as illustrated in
• the fibers having passed the rolling device 12 do not completely attain their original shape, because the rolling pressu re is so high that the cell walls are to some extent deformed, and the single .fibers are flattened .
• the compression/expansion effect or pressu re/vacuum effect to which the fibers and the liquid substance applied thereto are exposed during the rolling treatment causes that a very intimate contact and uniform distribution of the liquid substance over all inner and outer su rface parts of the fibers is obtained .
• the fibrous material is exposed to an elevated temperature during rolling which in connection with the uniform distribution of the liquid substance creates optimum ⁇ conditions for physical and chemical reac ⁇ tions in the fibrous material and between the fibrous material and the liquid substance.
• the liquid substance may, e. g. , be any desired impregnating liquid substance which is able to impart desired characteristics to the fibrous material .
• the fibrous web 10 so treated leaves the rolling device 12, it may be supplied to a hammer mill 19 or another fluffing device, in which the material is defibrated and may, at the same time, be further treated .
• the heating and drying device 13 comprises a tunnel 20 through which the fibrous web 10 supplied from the supply roll 11 is passed. While the web 10 is passed through the tunnel 20 it is heated by means of a number of infrared radiation devices 21 arranged in the upper part of the tunnel .
• the radiation devices 21 may be cooled partly by means of a blower 22 which may blow cooling air th rough a separate passage 23 at the upper part of the tunnel, and partly by means of pressurized air circulated through cooling passages formed in the radiation devices 21 and supplied from a suitable source, such as a compressor 24 combined with the driving motor.
• a suitable source such as a compressor 24 combined with the driving motor.
• the web may also be heated from below, or water vapour may be removed from below the web .
• the web 10 leaving the heating and drying device 13 in a completely dry and heated condition is passed beneath the spraying nozzle 16 having a number of nozzle orifices so that a uniform spray of a liquid substance may be applied to the web 10 in the full width thereof, and the nozzle is preferably arranged so that the spray provided thereby obtains a velocity component in the moving direction of the web 10.
• the liquid substance is pumped to the nozzle 16 by means of a feeding pump 25 through a supply conduit 26.
• the reservoir 15 When the liquid substance is of a type which is solid or which has a too low viscosity at room temperature, the reservoir 15 may be surrounded by a heating jacket containing electrical heating elements, and the liquid being pumped from the reservoir 15 into the supply conduit 26 (which is suitably also surrounded by an electrical heating jacket) may pass a heating device 27, e.g. , of the "hot melt” type. in which the liquid substance is further heated . I n the reservoi r 15, the heating device 27, and the supply conduit 26, the liquid sub ⁇ stance is heated so as to obtain a viscosity of the liquid at which the liquid may be pumped by the feeding pump 25 and satisfactorily distributed by the nozzle 16, and so as to secure a satisfactory penetration of the liquid substance into the fibrous material .
• the heating of the liquid substance is controlled so as to avoid at any stage of the heating process excessive heating which might cause decomposition, deterioration , or undesired polymerisation , of the liquid substance.
• nitrogen or another inert gas may be supplied to the reservoir 15 and the heating device 27 from a pres ⁇ surized gas container 28.
• the liquid application device 14 may contain a valve (not shown) controlling the supply of liquid substance to the nozzle 16, so that this supply will be intermittent.
• This valve as well as the feeding pump 25 may be driven by pressurize ' d air generated by the compressor 24, and the intermittent supply of pressurized air to the valve may be obtained " by means of an electrically controlled magnet valve.
• the resulting pulsating flow of liquid substance through the spraying nozzle effectively counteracts clogging of the nozzle orifices .
• the web 10 sprayed with liquid substance- is passed between a pair of guiding rollers 29 and along a guiding channel 30 to the rolling device 12 which in the embodiment shown in Fig . 3 comprises two separate rolling units 12a and 12b .
• Each of these units comprises a pai r of rollers 12', which are rotatably mounted in a frame 31 and driven by a driving motor 32.
• Each of the rolling units is designed to exert an extremely high pressu re at the nip and may, e. g . , be of the type used for making foils of gold or other metal , and the rolling pressu re may be adjusted by means of a manually operatable handle 33.
• Excessive liquid substance separated from the web 10 by the rolling unit 12a is collected in a tray 34 and retu rned to the heating device 27 through a return conduit 35.
• these rollers are preferably heated, for example by means of heating de ⁇ vices 36 directing a flow of heated air towards the rollers and the web 10 passing therebetween .
• the web should preferably be moved through the rolling unit or units at a rate which is controlled so as to obtain an optimum treatment of the fibers in the web .
• This rate may, for example, depend on the thickness of the fibrous web, the number of rolling units, and of the diameter of the rollers .
• the compression of the fibers will be less abrupt when the diameters of the rollers are relatively large and, therefore, the rate of motion of the web may be increased when the roller diameters are increased.
• the use of a plurality of rolling units may improve distribution of the liquid substance in the fibrous web 10.
• the second rolling unit 12b Because the length of the web 10 is increased while passing the first rolling unit 12a, the second rolling unit 12b must be driven at a slightly higher rotational speed, even if the two units are identical. This may be obtained by control ⁇ ling the driving motors 32 by means of a frequency transformer (not shown) .
• further additives in liquid or solid form * may be supplied to the web 10 between the rolling units 12a and 12b and/or between the rolling unit 12b and the hammer mill 19, for example by means of a further spraying nozzle 38.
• the rolled and impregnated web 10 is now drawn into the hammer mill 19 by means of a pair of drawing rollers 39 driven in synchronism with the rolling unit 12b .
• the hammer mill 19 which is driven by
• the treated fibrous web is subjected to extreme ⁇ ly heavy mechanical forces, whereby the fibrous material is completely defibrated ' .
• the defibration process is to a high extent facilitated by the preceding rolling treatment to which the fibers have been ex- posed .
• the heat generation within the hammer mill is rather heavy, and the temperature may be controlled by a supply of cooling air.
• the high temperatu re and the heavy mechanical action to which the fibrous material is exposed within the hammer mill 19 complete the physical and chemical reactions between the fibers and the additive or additives which started du ring the rolling treatment.
• Fu rthermore it is possible to supply further additive directly to the hammer mill, for example a powdered material which may be supplied continuously to a funnel 41 indicated in dotted lines in Fig . 3.
• Such further additives may comprise any liquid substance imparting desired properties to the fibers, for example, a lubricant, such as kerosene or ethanol .
• the defibrated mass discharged from the hammer mill 19 is supplied to a filtering device 42 th rough a conduit 43.
• the filtering device com ⁇ prises a rotating filtering cylinder 44 which has a cylinder surface defined by a wi re mesh and which is driven by an electric motor 45.
• This filtering device 42 separates the defibrated fibrous mass 46 from dust and additive residues which may pass through the wire mesh of the filtering cylinder 44 and into the inlet conduit 48 of a blower 49 having an outlet conduit 50 which is connected to a filter (not shown) for collecting the dust material .
• Fig . 4 shows a modified embodiment of the apparatus or plant illustra ⁇ ted in Fig . 3, and corresponding elements of the two embodiments have been provided with the same reference numerals .
• the tunnel 20 of the heating and drying device 13 has been divided into a number of vertically arranged sections 20a, 20b, and 20c, and at the ends of these sections the web 10 is guided by guiding bars 51 - 53.
• the liquid applicating device 14, the rolling device 12, the hammer mill 19, and the filtering device 42 are arranged along a vertical path .
• Fig . 4a shows a modification of the apparatus or plant illustrated in Fig. 4. I n Fig.
• the liquid applicat ⁇ ng device 14 is replaced by a liquid bath 66 contained in a receptacle which is confined by the oppositely arranged parts of the cylindrical surfaces of the rollers 12' and by suitable stationary end walls 67.
• the liquid level of the bath 66 is sensed by a liquid sensor 68, and liquid may be supplied to the bath 66 from a liquid reservoir 69 through an outlet tube 70 contain ⁇ ing a valve 71 .
• a control device 72 controls the valve 71 on the basis of signals received from the level sensor 68 so as to maintain a sub- stantially constant liquid level in the bath 66.
• the rollers 12' are pressed together at extremely high forces so as to compress the web 10 therebetween as described above.
• the embodiment shown in Figs . 3 and 4 are adapted to process a fibrous web
• the embodiment shown in Fig . 5 is adapted to process straw, wooden chips, and other ' pa rticu late materials .
• the starting material such as straw
• a receiving funnel 54 from which ma-ferial is supplied into a heating and drying device 55, in which the material may for example be dried by means of heated air.
• the heated and dried material is discharged into a second funnel 56, and while the material is falling from the drying device 55 into the funnel 56 a liquid substance may be applied to the material by means of • spraying nozzles 57 to which liquid may be supplied from a reservoir 58 by means of a pump 59.
• the wetted material may be supplied to a rolling device 60 which may be of the type previously described, and excessive liquid sepa ⁇ rated from the cellulose mass when passing the rolling device 57, is returned to the reservoir 58 through a return conduit 51 .
• the mate ⁇ rial having passed the rolling device 60 is dropped into a hammer mill 62 or another fluffing device from which the defibrated fibers are discharged to a filtering device 63 of the same type as that described in connection with Fig . 3.
• the fibrous web 10 being treated in the apparatuses or plants illu ⁇ strated in Figs . 3 and 4 may be a flexible, highly porous material .
• a panel or sheet material for example a wooden sheet material which is relatively stiff .
• the sheet material or panel being treated may be made up from sheet elements which may be mutually joined along V-shaped joints 64 in order to avoid any separation in the nip between the rollers 65 along a joint parallel to the roller axis (such type of, e. g . , V-shaped joint is also suitable for joining sheets of flexible material) .
• the method of the present invention is useful for a wide va riety of treatments of fibrous materials , ranging from the case where the high pressure treatment is utilized for crushing a fibrous ' material to obtain a finer fiber size (a higher SR , e. g . , a SR of 70 - 80) by omitting any "lubricant" liquid substance du ring the high pressu re treatment, to the case where liquid substances for impregnation of the fibers and simultaneously "lubricating" du ring the high pressu re treatment are added and are optionally combined with addition of further substances of liquid of solid character subsequent to the high pressu re treat- ment, e. g .
• the high pressure treated material may be passed th rough the remaining stages of the treatment as illustrated in Fig .
• a "lubricant” or “coolant” is suitably added prior to or in the hammer mill, such as mentioned above, or the high pressure treated material may be withdrawn as it is from the high pressu re treatment for later dry defibration or for later conventional wet pulping .
• the high pressure treatment is performed in the presence of a liquid substance penetrating the material, the liquid substance will normally serve as a "lubricant” and will counteract fiber crushing.
• the fibrous material subjected to defibration e.g. in the hammer mill
• a "composite paper” comprising 60% of sulphate pulp, 30% of eucalyptus fibers, 6% of 6 mm rayon fibers, and 4% of 8 mm rayon fibers could be defibrated in the hammer mill .
• other fibers or materials could be incor ⁇ porated during the preparation of such a "composite paper", including other fibers such as sisal , coir, mineral fibers, and optionally also particles or fibers of polymer which will form the matrix or part of the matrix of the later composite material in which the fibers in question serve as reinforcing fibers .
• the resulting " composite paper” is subjected to the high pressure treat ⁇ ment discussed above, with or without impregnation with desired impregnation agents and/or combinations thereof. It will be under ⁇ stood that in this manner, almost unlimited possibilities are provided for establishing a treated fiber material of exactly defined properties for a given purpose.
• the liquid substance supplied to the dried fiber material prior to the high pressure treatment, in particular the high pressure rolling is an impregnation agent, that is , an agent, which will completely or parti- ally be incorporated in the fiber material to impart desired properties to the fibers .
• impregnation agent designates a substance which will combine chemically and/or physically with the fibers to result in a substantially permanent chemical and/or physical bond between the fibers and the substance.
• one aspect of the invention is constituted by a method in which a cellulose-containing material is heated to the tem ⁇ peratures mentioned above and is thereafter reacted with a reactant capable of reacting with cellulose hydroxy groups .
• a reactant capable of reacting with cellulose hydroxy groups .
• the impregnation of a cellulose-containing material with, e. g . a reactive material such as a metal oxide acylate or an isocyanate after heating of the material to the temperatures stated above is believed to be novel per se and is important per se for several purposes, e. g . for preparing waterproof liner (wrapping paper) and the like.
• One important class of impregnation agents which is most advanta ⁇ geously incorporated into the fiber material by means of the high pressu re treatment according to the invention comprises the so-called metal oxide acylates .
• Metal oxide acylates constitute a class of metal organic compounds described, e. g . , in US Patents Nos . 3,087,949, 3, 243,447, 3, 177,238, 3,518,287, 3, 625,934, 3,546,262, 3, 634,476 and 3, 673,229, BE Patent ' No. 735,548, and GB Patents Nos . 1 ,230,412, 1 ,274, 718, 1 , 552, 601 , and 1 , 552, 602.
• the general composition of the metal oxide acylates is supposed to be divalent metal : ( R-Me-O-Me-R) linear compounds trivalent metal : (O -Me -R,,-) planar compounds tetravalent metal : (O fi -Me .-R 4 ) tetrahedron -shaped compounds
• Me is a metal atom
• R is an acylate group which is an organic acid residue with at least 12 carbon atoms
• metal oxide acylates wherein each molecule contains two or more different metals, possibly of different valence, can also be made, and such types of compounds, as well as other variants of metal oxide acylates and mixtu res thereof are also described in the above-mentioned patent specifications. Further details concerning metal oxide acylates and their use in impregnation of cellulose fibers are found in I nternational Patent Application No. PCT/DK79/00055, published under publication No. WO 80 101176 on June 12, 1980.
• metal oxide acylates in cellulose fibers by the high pressu re impreg ⁇ nation method of the present invention results in fibers which are extremely uniformly impregnated throughout their cross section, and which show excellent desired properties for a variety of uses .
• the metal oxide acylate seems to be perma ⁇ nently and un removably bonded to the fibers, such as will appear from the experimental results reported below.
• This "impregnation bond” may be due to chemical reaction between the metal oxide acylate and reactive sites, such as hydroxy groups, of the chemical structure of the cellulose fibers, or due to intimate bond of a predominantly physical character between the cellulose fiber and a coating of poly ⁇ merized metal oxide acylate, or due to a combination of these effects .
• Cellulose fibers impregnated with metal oxide acylates by the method of the invention show drastically reduced tendency to absorb water, and hence, retain dimension stability when incorporated in water or an aqueous slurry. I n this regard, e.g . , cellulose fibers impregnated with aluminum oxide acylate have been found to have substantially the
• the invention provides very interesting metal oxide acylate- impregnated cellulose fibers for a number of purposes where a dimen ⁇ sion stable, non water-absorbing fiber is desired.
• the fibers are treated with a combination of a coupling agent, such as a silane, and a metal oxide acylate.
• a coupling agent such as a silane
• the coupling agent and the metal oxide acylate may be added to the cellulose fiber material separately, or they may, according to a particularly preferred embodiment of the invention, be added together in that the coupling agent is incorpo ⁇ rated in the metal oxide acylate supplied to the fibers .
• this combination which is illustrated in the examples below, does not seem to result in any disadvantages with respect to the function of the metal oxide acylate or the coupling agent.
• the treatment of cellulose fibers with a combination of a metal oxide acylate and a coupling agent such as a silane constitutes a particular aspect of the present invention, and this aspect is not limited to the incorporation in connection with the high pressure treatment described above (although this is the presently preferred incorporation method) , but may, within the scope of this aspect of the present invention, be performed by any suitable incorporation method that will result in efficient impregnation, including incorpo ⁇ ration under high shear conditions such as in a hammer mill or the like.
• treatment of cellulose fibers with a metal oxide acylate and preferebly also a coupling agent is combined with the application of inorganic particulate substances on the fibers .
• inorganic substances may be applied on the fibers , e. g . , prior to the treatment in the fluffing or defibration unit such as a hammer mill, or in the hammer mill , or pa rticulate substances may be applied to the fibers after thei r removal from the filter 44.
• inorganic substances incorporated may be mentioned cement, silica, in particular ultrafine silica precipitated from a gas phase, e. g .
• cement or silica applied on metal oxide acylate- impregnated, dimension stable fibers for use e.g. as reinfor ⁇ cing fibers for incorporation in cement-bonded composite materials such as for the preparation of the type of shaped articles normally made from asbestos-reinforced cement, will tend to further improve the dispersion of the fibers in an aqueous cement-containing slu rry.
• Cellulose fibers according to the invention with cement particles applied thereon may even be designed, with respect to the amount of cement and possible other additives, in such a manner that the fibers will require only addition of a correct amount of water to establish the slurry for formation of the fiber- reinforced cement-bonded mate ⁇ rial .
• Another type of particulate material which may suitably be incorporated on the impregnated cellulose fibers, in particular the metal oxide acylate- impregnated cellulose fibers is absorbant particles such as charcoal.
• the metal oxide acylate-impregnated cellulose fibers carrying charcoal particles have been found to constitute a most useful type of absorbant high quality fiber for a number of purposes .
• the metal oxide acylate may suitably be combined with a coupling agent such as a silane.
• a coupling agent such as a silane.
• the aspect of the invention constituted by metal oxide acylate-impregnated cellulose fibers carrying charcoal is not limited to the particular high pressure method of preparing such fibers as is described above (although this is the presently preferred method) , but also encompasses the cases where other suitable methods are used for impregnating the cellulose fibers with the metal oxide acylate and applying the charcoal .
• metal oxide acylate-hydrophobized cellulose fibers are to be incorporated in aqueous slurries, e. g . , cement-containing slurries, it is desirable that they should be as easily dispersible therein as possible.
• the hydrophobization may counteract the dispersibil ⁇ ty of the fibers in aqueous media .
• the dispersibility of such hydrophobized cellulose fibers is improved by incorporation of one or more surface- active agents of a character imparting hydrophilic properties .
• v7IPO phobic by impregnation with a metal oxide acylate they may, never ⁇ theless, obtain improved hydrophilicity or dispersibility in aqueous media by incorporation of suitable tensides or combinations of tensides of types which increase hydrophilicity or water dispersibility.
• suitable tensides or combinations of tensides of types which increase hydrophilicity or water dispersibility are suitable for this purpose. Even more surprisingly, it has been found that such tensides need not be added separately from the metal oxide acylate (although they may, of cou rse be added separately from, in particular after, the addition of the metal oxide acylate) , but may be added together with the metal oxide acylate and even incorpo ⁇ rated in the metal oxide acylate.
• a further aspect of the present invention comprises cellulose fibers which are impregnated with a metal oxide acylate and additionally comprise one or several surface active agents modifying the character of the fibers towards greater hydrophilicity.
• this aspect of the invention is not limited to the case where the metal oxide acylate and/or the su rface active agents are incorpo ⁇ rated by means of the high pressure impregnation technique disclosed herein , but generally comprises such fibers irrespective of how the metal oxide acylate (or other useful hydrophobizing agent) and the surface active agents have been incorporated, but the high pressure vacuum impregnation method disclosed herein constitutes the presently preferred method for preparing these hydrophobic cellulose fibers with increased dispersibility in aqueous media .
• the metal oxide acylate impregnation with the incorpo ⁇ ration of one or more of the su rface active agents modifying the fibers towards greater hydrophilicity or dispersibility in aqueous media, the incorporation of coupling agent, and the application of inorganic particulate matter in any desired manner, and also combi ⁇ nations of the above-mentioned principles, but without metal oxide acylate, may be used, depending on the particular end use of the cellulose fibers so treated .
• O PI ding to the aspects of the present method may be designed for and useful for a wide variety of purposes .
• the use of the cellulose fibers of the invention as reinforcing fibers for composite materials having inorganic or organic matrices has already been mentioned above.
• Other interesting aspects of the utility of the treated fibers according to the invention are:
• active carbon -treated metal oxide acylate-impregnated fibers are used as absorbant fibers, e.g . , for absorptive filters liquid or gases, e.g . , for wine, beer, household uses, gas masks, etc.
• these absorbant fibers carrying charcoal or other absorbant are used for hygiene articles or napkins (diapers) .
• antibacterial properties could be impar ⁇ ted to such fibers, such as by using, as the metal oxide acylate or part of the metal oxide acylate component, a metal oxide acylate having antimicrobial properties, such as a zinc oxide acylate.
• the application of activated carbon on cellulose fibers to obtain cellu ⁇ lose fiber-borne or -bonded activated carbon constitutes a particular aspect of the present invention .
• the activated carbon may be applied not only to metal oxide acylate-trea- ted cellulose, but quite generally to any suitable cellulose fiber, impregnated or not impregnated, and the application may be per ⁇ formed by a method according to the present invention or by any suitable method for applying activated carbon to cellulose fibers, including application in a pulper or hollander.
• Another suitable method of applying activated carbon on cellulose fibers is to apply the activated carbon in a hammer mill or in another high shear treatment apparatus .
• the metal oxide a cy late-treated or -im- pregnated cellulose fibers e. g. , aluminum oxide acylate-impregnated cellulose fibers
• oil absorbant fibers for example for use in oil absorbant tissues for use in workshops and factories or for removing oil waste or oil pollution .
• the oil-absorbing cellulose fibers of the present invention may be packed, in non-bonded form, into permeable bags of a design adapted for being placed or moved at the location of the oil pollution .
• a further interesting use of the fibers prepared according to the present invention is as binder or bonding fibers for consolidation of e. g . dry laid , paper, non-woven fabrics, etc.
• the fibers are suitably impregnated with a bonding agent, e. g . , a poly ⁇ mer, which elicits its bonding properties at an elevated temperatu re, suitably a temperatu re of up to about 150 C, e. g . from about 80 degrees Celsius to about 150 degrees Celsius .
• a further use of the impregnated fibers according to the invention is as hydrophobic fibers in hygiene a rticles and diapers or napkins as an intermediate layer between hydrophilic fibers therein and the exterior of these articles.
• the fibers are suitably impregnated with a metal oxide acylate or a metal oxide acylate combination which is hydro ⁇ phobizing , e. g . aluminum oxide stearate or tallate.
• a further field of utility of the impregnated fibers of the invention is as flameproof fibers .
• the fibers may be impregnated with conventional flame-retardant or fireproofing agents such as phosphorus and/or chlorine-containing flame-retarding agents, and/or with a metal oxide acylate which in itself is flame- retardant or fire ⁇ proofing such as an antimony oxide acylate.
• a further interesting utility of the metal oxide acylate-impregnated cellulose fibers of the invention is as antistatic tissues, e. g . , for glasses or lenses .
• cellulose materials 11 were passed th rough the treatment stages shown and were treated with a number of liquid substances and , in some cases , solid addi- tives during passage through the treatment stages, to yield a great variety of useful treated cellulose fibers 46.
• MOA C 1460 Aluminum oxide stearate, solution of 60% solid contents in white spirit. Available from MOACO S.A., Lausanne, Switzerland.
• MOA C 1400 Aluminum oxide stearate, solid. Available from
• MOACO S.A. Lausanne, Switzerland.
• MOA DF-00 Silicon-titanium alkoxide condensed oligomer 100%.
• MOA DF-1400 Silicon-titanium alkoxide stearate. (An oligomer of titanium and silicon in which each silicon atom is linked to titanium atom through an oxygen bridge. To each silicon atom three ethoxide groups are attached. To each titanium atom two stearyl groups are attached.) Tan waxy solid having a flash point of 210°C, metal content 4.8% Ti, 5.6% Si. Available from MOACO S.A., Lausanne, Switzerland.
• MOA DF-1000 Silicon-titanium alkoxide tallate Available from MOACO S.A., Lausanne, Switzerland.
• MOA CDF-1400 Silicon -titanium-aluminium alkoxide- stearate. Available from MOACO S.A., Lausanne, Switzer ⁇ land.
• the product m 2 n also contains about 25% of the solvent ester RX, which is the isopropyl ester of a satu rated fatty acid . Available from Manchem Limited, Manche ⁇ ster, England .
• Aluminum content 8.6%.
• BEROL 370 A nonionic tenside consisting of an ethylene oxide/propylene oxide block polymer. Has a hydrophilic (water-soluble) character. Its surface-active properties are as follows :
• BEROL 563 A cationic tenside consisting of alkyl-poly- glycoletherammon ⁇ ummethy! sulphate. Its sur ⁇ face-active qualities are as follows :
• BEROL 572 A cationic tenside of the type quaternary ammonium compound having antibacterial proper ⁇ ties . Its surface- active properties are as fol ⁇ lows:
• BEROL FI NTEX 573 A cationic surfactant consisting of al kyl poly- glycolether ammoniumethyl sulphate and a non- ionic wetting agent. Its su rface-active proper ⁇ ties are as follows :
• Silane A-175 A silane coupling agent, consisting of Y-metha- cryloxypropyl-tris (2-methoxyethoxy) silane from Union Carbide
• Silane A-1100 A silane coupling agent, consisting of Y-amino- propyltriethoxysilane, from Union Carbide.
• Silane A-1 102 A silane coupling agent, consisting of Y-amino- propyltriethoxysilane, from Union Ca rbide.
• Desmodur T80 and Desmodur T65 Mixtures of the two isomeric forms 2,4-diiso- cyanato-toluene and 2, 6-d ⁇ isocyanato- toluene in the ratio 80:20 (Desmodur T80) and 65:35 (Desmodur T65) , respectively. From Bayer.
• ANTI BLAZE 78 A flame retardant, chlorinated phoshonate ester, phosphorus content 12.0%, chlorine content 34.0%, clear liquid that may crystallize at, or below, 75 F.
• V1 RCOL 82 A flame retardant phosphorus-containing polyol from Mobil Chemical designed for use as a chemically bound, co-reactant flame retardant for urethane foams .
• MOB I LCER Q An acid stable microwax emulsion , solid content average 51%, congealing point of wax 65 C, particle size 1 - 3 ym, from Mobil .
• AQUAPEL 3100 XL A synthetic gluing agent which reacts with cellulose under neutral or alkaline conditions, a 15% emulsion of al kylketene dimer having a cationic starch derivative as protective colloid . From Hercules Kemiska Aktiebolag, Hisings Backa, Box 2019, Sweden .
• KYMENE 557 H A highly effective cation active wet strength resin , polyacrylamide epichlorohydrin . From Hercules Kemiska Aktiebolag, Hisings Backa, Box 2019, Sweden .
• OMFI cA IPO MELMENT L 10- 20% A concrete superplasticizer: 20% solution of an anionic melamine resin .
• CEM-MIX A concrete superplasticizer: Sodium salt of a highly condensed naphthalene sulphonic acid/ formaldehyde condensate, of which typically more than 70% consist of molecules containing 7 or more naphthalene nuclei . Available from Aalborg Portland, Denmark.
• AI RFLEX 120 self-crosslink ⁇ ng vinyl-ethylene emulsion, 52%, from Air Products ⁇ - Chemicals, Wa ⁇ ne, PA. , U . S . A.
• Wacker Si-Dehasiv 920 from Wacker Silicone curing Wacker Si-Dehasiv 920 from Wacker Silicone, a 100%, absolutely solvent-free add ⁇ tion-cross- Iink ⁇ ng silicone.
• Cab-O-Sil Colloidal silica particles particle size about 10 - 20 ym .
• Norit W 20 Activated carbon from Norit, iodine number 700 mg/g, apparent density 600 g/l .
• PVC solution Composition 50 g of pure PVC (without plasti- cizer) , 300 g of tetrahydrofuran, 500 g of methylene chloride, and 0.5 g of Silane A-1100.
• Potassium water glass Be° 28 - 30 Bleached sulphate pulp Sheet weight about 750 g/m . From Stora Kop- parberg, Sweden .
• CTMP pulp Chemo-thermo-mechanical pulp. Consists of about 15% of bleached sulphate cellulose having an SR° of about 16 and about 85% of thermo- mechanical pulp having an SR° of about 16. The pulp is free from anti-bonding agents and other
• Sheet weight about 750 g/m .
• the treating agents or combinations of treating agents listed were supplied to the cellulose web 10 th rough the supply conduit 26 (except when otherwise indicated) , heated by means of the heating unit 27 and the heating jacket of the supply conduit 26 to 200 C (when no other temperature is stated) and were added, in the amounts stated in the examples, to 10 kg of dried, bleached sulphate cellulose which was heated to about 110 C during passage through the tunnel 20.
• additional material was added in the hammer mill 19, or immediately prior to the hammer mill 19.
• Silane A-1 100 30 30 30 30 30 30 30 30 30 30 30 30 30
• MOB1 LCER Q 500 500 1000 1000 500 500 LUDOX HS 40% 500 Potassium water glass 500 Diammonium phosphate 35% 250 Boric Acid 30% 250 ALMID 7 50% 500 Ammonium sulphate 30% 100 AQUAPEL 3100 XL 1000 Silane A-1100 50 Silane Y-9566 40% 50
• Silane A-1 100 100 300 200
• MOA C 1400 500 500 500 MOA DF-1400 500 500 500 400 400 MOA DF-00 200 200 400 TES 40 200 200 TES 40 ⁇ Silane A1102 in the ratio 96:4 • 200 200 400
• a sulphate cellulose pulp was dried and passed through the rollers at maximum pressure (about 10,000 kp) without addition of any liquid prior to the rolling treatment.
• the resulting rolled product had a "tobacco flake-like" appearance and consisted of fibers which had a considerably higher fineness than the starting fibers . When dispersed in water, these fibers sedimented, indicating a high density. Paper made from the fibers on a laboratory sheet former was parchment ⁇ like, indicating that the fibers had obtained a considerably higher SR°. The paper had a high tensile strength, but a poor tear strength, like parchment paper.
• Subject liner made from sulphate cellulose to drying at 200°C.
• metal oxide acylate aluminum oxide tallate or stearate or zinc oxide tallate or stearate
• the resulting impregnated paper may either be used per se, or it may, preferably, be subjected to the rolling treatment described in the previous examples .
• the resulting impregnated liner is water-proof (water-repellant) .
• the metal oxide acylate is a zinc oxide acylate
• the liner is also resistant against fungal attacks. I n the same manner, e. g.
• sulphate pulp may be treated and either high pressu re rolled or used per se with ⁇ out rolling, in either case for example as a carpet backing, a roof paper, or a sheet-shaped reinforcement for cement materials and plastics materials such as phenolic resins and polyesters .
• the fibers were made into a slu rry by pulping 140 kg of treated fibers with 5000 liters of water for 20 minutes . To the resul ⁇ ting slurry, a slurry of 3 tons of cement and about 50 kg of ultrafine silica, calculated on the cement incorporated, was added . Both the dispersion of the fibers and their incorporation in the cement slu rry were easy. In the loader of the machine, the resulting fiber slurry was admixed about 0.
• Examples 1 - 5 The fibers had pronounced hydrophobic character.
• Examples 6 - 10 The fibers are suitable for incorporation as reinfor ⁇ cing fibers in cement-based materials .
• Examples 11 - 15 The fibers show excellent properties in that they do not absorb water, but yet are easily dispersed, e.g. , in cement- containing slurries .
• Example 16 The fibers are somewhat st ⁇ ffer than the fibers impreg ⁇ nated with metal oxide acylate alone. They are envisaged to be use- ful, e.g. , as reinforcing fibers in polymers such as polyurethane or polyester.
• Examples 19 - 24 In these examples, the fibers were impregnated with a combination of metal oxide acylate and surface active agents to yield stabilized fibers which are not water-absorbing and, hence, do not swell, but which, nevertheless, are sufficiently hydrophilic, due to the incorporation of the surface-active agents, to be easily disper- sible in aqueous slurries . Furthermore, the fibers were treated with particulate materials, added prior to the hammer mill .
• Examples 25 - 27 The fibers produced in these examples show ex ⁇ cellent absorbent properties due to their content of charcoal and are useful, e.g . , as filter materials for liquids or gases, e. g . , as filter materials for filtering wine, beer, as household or kitchen filters , as filters for gas masks, and as filter materials for drin king water.
• Examples 28 and 29 The fibers produced according to these examples are particularly well suited as reinforcing fibers for cement, gypsum, etc.
• OMPI Example 30 The fibers are useful as hydrophilic substrate fibers for soil-less plant cultures, but are also useful, e. g . as filter material .
• Examples 31 - 36 These experiments were performed to show that the method of the invention may also be used for aqueous dispersions, solutions, etc. Even when impregnating with such aqueous materials, it is very advantageous first to perform a thorough drying treatment in the tunnel 20, as this secures a fast penetration .
• Example 38 I n this experiment, the latex applied was "filtered" by the cellulose web and remained on top of the web which is undesired . It would be desirable to use dispersions having a higher film forming temperature, e. g . , a temperature above 110 C.
• Example 39 The fibers obtained showed an excellent combination of hydrophobicity and fire resistance.
• Example 40 the fibers were relatively stiff and hydrophobic, but were not fi re resistant.
• Examples 43 and 45 The fibers had an excellent dispersing capacity.
• Example 48 The fibers are envisaged to be useful as fillings for pillows, as heat insulation materials, for clothes , etc.
• the fibers are very smooth and slide easily relative to each other.
• Example 49 The fibers are suitable as bonding fibers in non-woven structures, e. g . dry-formed paper.
• Examples 50 - 56 I n these experiments, the metal oxide acylate was combined with other agents by adding the other agents in or imme- diately prior to the hammer mill . Although excellent fibers were obtained, the addition of the other agents to the metal oxide acylate, such as illustrated in Examples 11 - 15, is preferred .
• Example 58 I n contrast to Example 57, the fibers prepared in this example have retained their capability of bonding together when being suspended in water and thereafter filtered and dried .
• Examples 62-72 The fibers are excellently suited for incorporation (in amounts of about 4-10% by weight in cement panels .
• Examples 85-95 Because the straw cellulose fibers are very small, the impregnated fibers prepared according to these examples are very well suited as thixotropic agents in water-based and solvent-based paints.
• Fibers prepared according to Example 1 were subjected to extraction in Soxhlet apparatus with dichloromethane and petroleum ether, re ⁇ spectively. It was found that 5.2% of the substance applied could be extracted with dichloromethane, and that 4.5% of the substance ap ⁇ plied could be extracted with petroleum ether, that is, about half of the weight of the aluminum oxide stearate applied .
• Fig . 7 is a scanning electron microscopy (SEM) photo (magnification 54x) showing the distribution of aluminum through the treated web. It will be noted that the distribution is very even.
• Fig . 8 is a SEM photo (magnification 110x) of the fibers and shows that some of the fibers are quite collapsed while others are quite round .
• Figs. 11 and 12 show that the fiber end (Fig . -11 ) and the fiber surface (Fig. 12) have an appearance quite different from a - normal pulp fiber.
• I nvestigations comprising contact angle measurements and absorption measu rements on the fibers (extracted and non-extracted) show that the surface of the fibers is clearly hydrophobic and lipophilic. Also, it was clearly found that the fibers do not swell in solvents . Fur ⁇ thermore, it is evident that the fibers retain their hydrophobicity even after extraction .
• the water retention value (WRV) of the fibers was determined .
• the fibers prepared according to Example 1 were subjected to a thermal analysis which showed that an endothermic reaction starts at 50°C and is complete at 120°C, maximum at 85°C.
• the reaction cor ⁇ responds to the removal of about 5% of water.
• the fibers have a low degree os swelling in water, and the zeta potential corresponds to the zeta potential of a normal pulp.

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• 1982
  • 1982-06-03 EP EP82901784A patent/EP0079927A1/de not_active Withdrawn
  • 1982-06-03 WO PCT/DK1982/000052 patent/WO1982004271A1/en not_active Application Discontinuation
  • 1982-06-03 JP JP57501815A patent/JPS58500901A/ja active Pending
• 1983
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