EP0433413A1 - Charge vegetale poreuse, micronisee, peu dense, de granulometrie controlee et de faibles surfaces specifiques physique et hydraulique, procede de preparation et utilisation. - Google Patents
Charge vegetale poreuse, micronisee, peu dense, de granulometrie controlee et de faibles surfaces specifiques physique et hydraulique, procede de preparation et utilisation.Info
- Publication number
- EP0433413A1 EP0433413A1 EP19900909461 EP90909461A EP0433413A1 EP 0433413 A1 EP0433413 A1 EP 0433413A1 EP 19900909461 EP19900909461 EP 19900909461 EP 90909461 A EP90909461 A EP 90909461A EP 0433413 A1 EP0433413 A1 EP 0433413A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- less
- vegetable
- micronized
- equal
- micrometers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/06—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood powder or sawdust
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
Definitions
- the present invention relates, as a new industrial product, to a porous, micronized, sparse plant charge, of controlled particle size and of small specific physical and hydraulic surfaces.
- It also relates to the process for preparing said vegetable charge, as well as its use in the field of pulp, paper, cardboard, and nonwovens on the one hand, and in the field of plastics, composites, paint, coatings and materials. on the other hand.
- articles for sanitary and domestic uses sanitary napkins, household paper towels, handkerchiefs, napkins and tablecloths, hand towels and industrial wiping articles, fluff products for baby diapers , for periodical linings, hygienic protective articles, absorbent pads, use cellulosic base supports, creped or not, possibly embossed, smoothed, calenders and of composition suitable for obtaining the properties required by the market and which are: the water absorption capacity depending on the fibrous structure of the material, its bulk, its porosity, its ability to crepe, its softness, its elasticity, its flexibility, its mechanical resistance, its appearance properties.
- the paper industry uses different cellulosic or synthetic fibrous materials, on the one hand, and various organic, mineral or synthetic chemical adjuvants, on the other.
- CTMP or B.CTMP pastes are made from wood shavings which undergo, after washing, chemical pretreatment with sodium sulfite, baking between 120 ° C and 170 ° C, refining under pressure and, as required, bleaching with hydrogen peroxide and oxygen for example in one stage or two stages.
- a CTMP paste of 15 to 25 ° SR is particularly intended for the manufacture of absorbent papers or fluff paste.
- a moderately refined pulp of 30-40 ° SR can be used for the manufacture of multijet cartons and an even more refined pulp of 40-50 ° SR will rather be used for the manufacture of fine papers or printing-writing.
- CTMP computed tomography
- TCMP heat treatment first
- PAX process operated in the USA
- SCMP advanced sodium sulfite treatment
- Bisulfite chemical pulps richer in hemicelluloses than kraft pulps, are also used for the manufacture of household and sanitary articles. Fluff pastes are more resistant than chemical mechanical pastes but with much less interesting hydrophilic properties. Bisulfite pastes are obtained from a complex and expensive process.
- All of these cellulose paper pulps have specific surfaces greater than 1 m 2 / g.
- specific surfaces of a pulp of bleached softwood fibers vary between 1.3 and 4 m 2 / g.
- the absorbency of a paper can also be improved by the incorporation of chemical additives such as wetting agents: polyglycolic ethers of nonylphenol, octylphenol, fatty alcohols, mixed polyglycolic ethers ethylenepropylene, d fatty acids and derivatives, sorbitan esters, polyglycols, glycerol, alkyl aryl sulfonic acid, ammonium lauryl sulfate, ammonium lauryl ethers sulfate, phosphoric esters, ethoxylated fatty amines, derivatives d 'quaternary ammonium for example, but these expensive additives generate foams and can therefore disturb the course of the manufacture of the material.
- chemical additives such as wetting agents: polyglycolic ethers of nonylphenol, octylphenol, fatty alcohols, mixed polyglycolic ethers ethylenepropylene, d fatty acids and derivatives, sorbit
- these are, for example, the standard dyes of the paper industry which belong to 3 groups: basic dyes with a cationic nature having a particularly high affinity for unbleached fibrous materials and mechanical pulps, anionic acid dyes, direct dyes or nouns with anionic or cationic charge.
- opacifying fillers such as titanium oxide.
- opacifying fillers such as titanium oxide.
- process adaptations to correctly fix these materials on the fibers (anionic or cationic retention agents, pH adjustment, etc.), and this, in order to reduce losses and pollution.
- various conventional mass adjuvants for reinforcing properties in the dry and wet cane state for example natural or synthetic organic binders, anionic or cationic, in particular starchy products, polyvinyl alcohols, latex, vegetable proteins, cellulose esters, urea-formaldehyde and melamine-formaldehyde resins, glyoxal, in particular cationic and crosslinked polyalkyleneamines, condensation products of raelamine formaldehyde and amino caproic acid, polyacrylamides, etc.
- natural or synthetic organic binders anionic or cationic, in particular starchy products, polyvinyl alcohols, latex, vegetable proteins, cellulose esters, urea-formaldehyde and melamine-formaldehyde resins, glyoxal, in particular cationic and crosslinked polyalkyleneamines, condensation products of raelamine formaldehyde and amino caproic acid, polyacrylamides, etc.
- mass adjuvants may also be used to obtain particular characteristics concerning the aspect: shading, brightening, coloring, special surface effect, or additives favorable to dimensional stability, inertia, fungicidal, bactericidal or flame retardant agents.
- the manufacture of certain special papers also uses chemical reagents to identify or forge the papers. All these products are generally incorporated directly into the mass with the need to retain them well in the fibrous texture to reduce material losses during the draining operation and the formation of the sheet but also to reduce pollution : mineral and organic fillers are also used which, as a general rule, improve the drying of the sheet, therefore the productivity, but at the expense of the hand and the rigidity.
- the manufacture of composites, coatings and building materials also uses a wide variety of organic, mineral, natural or synthetic plant materials to obtain specific characteristics, but these materials are not made from specific plant charges for be favorable to the fixing of polymers, resins and / or which can confer interesting technical and economic properties on the final material such as sound insulation properties, thermal and electrical properties.
- a process of preparation by the papermaking process of a fibrous or sheet material which comprises the introduction of a pulverulent vegetable load in an aqueous dispersion containing fibers, being characterized in that said vegetable load is micronized, has a density lower than 500 kg / m 3 and has a particle size such that (i) at least 95% by weight of the particles of said vegetable load have dimensions less than 150 micrometers, and (ii) at most 80% by weight of the particles of said vegetable load have dimensions greater than 10 micrometers.
- the micronized vegetable load according to said international application has a density of less than 300 kg / m 3 and is obtained by a grinding-micronization operation from plant waste having an average particle size of less than 5 mm and a residual humidity of less than 20%.
- the aforementioned summary No. 8739 recommends, for the manufacture of electrically insulating panels, the use of a mixture of 70-95% by weight of cellulose pulp (kraft fibers) and 30-5%
- US Pat. No. 3,184,373 relates to the improvement of the retention of fillers in paper and cardboard by means of a retention agent such as polyethyleneimine, melamine-formaldehyde resins and urea-formaldehyde resins, said " fillers "being defined (see column 2, lines 3-34) as being solid or liquid substances and comprising in particular the mineral paper fillers themselves, metal powders, thermosetting resin powders, thermoplastic resins, binders, flocculants and wood powder (see column 2, line 27).
- the particle size of said "fillers” is indicated as being between 60 mesh and 2000 mesh (see column 1, lines 70-71).
- document US-A-3184 373 gives no example illustrating the use of said wood powder introduced into the mass; moreover, it neither describes nor suggests the specific particle size and density of the plant charge according to the invention.
- Document DE-C-415 675 proposes a sizing process according to which a colloidal dispersion of a submicronic substance (that is to say of a particle size less than 1) is incorporated into an aqueous suspension of fibers (i) micrometer) containing cellulose and coming from the grinding of wood or straw, then (ii) a flocculant.
- Said submicron substance which therefore has a particle size significantly smaller than that of the plant charge according to the invention, fulfills a role completely different from that of said plant charge; indeed said submicron substance is presented in DE-C-415 675 as reducing the porosity of the resulting paper by sealing and / or filling the pores of the fibrous web, while according to the invention an increase in porosity is sought.
- FR-A-2 612 828 (which was made public on 30.09.1988) of products which may be incorporated into paper and cardboard, containing cellulose and obtained by physico-chemical treatment of wood shavings or cellulose fibers .
- Said products containing cellulose have a composition different from that of the vegetable or fibrous source from which they are derived. Indeed, the physical and chemical treatments to which said source has been subjected do not preserve the integrity of the components of said source.
- the cellulose thus obtained is different from the composition of the vegetable filler according to the invention having regard to the nature of the components of the latter.
- the aforementioned summary No. 7191 describes the use of microfibrillated cellulose for the production of coating plasters. Again the cellulose microfibrils are different by their structure and their composition of the plant charge according to the invention.
- the present invention differs from the teaching of said summaries No 1523 and No 7191 and of said document FR-A-2 612 828 by the fact that the vegetable load, the use of which is recommended in the mass, has retained substantially all of the components of the plant source; in the vegetable load according to the invention only the water content and the content of volatile substances (such as essences of low boiling point) could be affected with respect to the starting vegetable source. So if the vegetable source is wood, we will find in the vegetable load practically all the components of wood as described in the book by FEN3EL et al., W00D CHEMESTRY ULTRASTRUCTURE REACTIONS, pages 26-33, editor D. GRUYTER (1984 ), incorporated here for reference. OBJECT OF THE INVENTION
- the present invention recommends a new technical solution which uses a micronized vegetable filler of particular characteristics for use in the manufacture of pulp, paper, cardboard, nonwovens, plastics, composites, paints, coatings and building materials.
- This vegetable load is obtained for economic reasons from vegetable waste which can be mainly wood waste.
- the new porous micronized vegetable charge which is recommended according to the invention is characterized in that,
- (1d) a density less than 500 kg / mr and preferably less than or equal to 300 kg / m 3 ;
- This new charge according to the invention is prepared according to a process which is characterized in that a vegetable source to be micronized is subjected to a grinding-micronization operation at a temperature below 150 ° C., preferably at a lower temperature. or equal to 100 ° C, and better at a temperature less than or equal to 70 ° C.
- a vegetable source to be micronized is subjected to a grinding-micronization operation at a temperature below 150 ° C., preferably at a lower temperature. or equal to 100 ° C, and better at a temperature less than or equal to 70 ° C.
- the micronized vegetable load has, at a residual moisture content of less than 20% and preferably less than 15% by weight relative to the total weight of said vegetable load, a particle size d 95 less than 200 micrometers, and preferably a particle size d 95 less than or equal to 150 micrometers [that is to say that in the latter case at least 95% of the particles (percentage expressed by weight) pass through a mesh screen square stainless steel opening 150 ⁇ 150 micro-meters, according to French standard NF X 11501].
- At least 80% by weight of the particles have an average particle size greater than 10 micrometers.
- the vegetable load according to the invention has, at a residual moisture content of less than 20% and preferably less than 15% by weight relative to the total weight of said vegetable load, a specific physical surface and a surface specific hydraulic less than 2 m 2 / g and preferably less than 1 m 2 / g.
- the physical specific surface can be determined by means of a mercury porosimeter such as the "Micrometric 9200" device which can reach a maximum pressure of 60,000 psi (or about 4,137 ⁇ 10 8 Pa).
- This technique essentially allows the determination of the dimensions and quantities of the empty spaces and (open) pores of the porous material as well as its specific surface and its density. Mercury is penetrated by immersing the material in the mercury and increasing the isostatic impression.
- A contact angle of mercury with the material. This physical specific surface can also be measured by the BET method (designated by the initials of the authors Brunauer, Emett, Teller) by adsorption of krypton in liquid nitrogen.
- the hydraulic specific surface is determined by the Pulmac method from the equations:
- R p specific resistance of a test piece
- W weight of the test piece expressed in g
- v viscosity expressed in poises (g / cm / s) [one poise corresponds to 0.1 Pa.s],
- c density of the test specimen expressed in g / cm 3 .
- the density of the micronized plant charge measured by means of a mercury porosimeter, at a residual moisture content of less than 20% and preferably less than 15% by weight relative to the weight total of said plant load, is less than 500 kg / m 3 and preferably less than 300 kg / m 3 .
- micronized vegetable filler according to the invention has a strong adsorbent or absorbent capacity.
- the present micronized vegetable filler as a carrier, vehicle or fixer for various conventional or special mass adjuvants in the paper industry in order to improve homogenization, distribution and retention in the fibrous texture of said adjuvants.
- These adjuvants can be introduced directly into the fibrous pulp containing the micronized vegetable filler or preferably into said micronized vegetable filler before incorporating it into the aqueous suspension of fibers.
- the strong adsorptive or absorbent power of the micronized vegetable filler according to the invention is advantageously exploited for strengthening the mechanical properties in the dry and wet state by fixing on said micronized vegetable filler of polymers, binders, organic resins natural or synthetic.
- This strong adsorbent or absorbent power can also be used for modifying the appearance of the material and its optical properties by fixing dye, shading agents, brightening agents, fluorescent agents or else on said micronized vegetable charge. specific chemical reagents.
- the strong adsorbent or absorbent power can be advantageously used in the field of identification or forging of papers and in particular so-called security papers.
- the micronized plant charge can also fix certain particular additives such as bactericidal means, fungicidal means and enzymes in order to give the finished material the special characteristics sought such as rot-proofing; the fixation of enzymes, proteins, antibodies or antigens is also useful in. field of microbiological assays using in particular reactions of the antigen / antibody type.
- the high adsorbent or absorbent power of the micronized vegetable filler according to the invention is also useful for fixing oils and fats and in particular thus making it possible to manufacture materials for packaging, wiping or even combating pollution.
- the strong adsorbent or absorbent power of the micronized vegetable filler according to the invention also makes it possible to fix the organic and / or mineral materials suspended in the dough such as pitch, sticky substances and other undesirable pollutants liable to disturb productivity by fouling of dressings, wet presses, on the one hand, and likely to disturb production on paper and / or cardboard machines due to dusting and linting of fibrous webs.
- micronized vegetable filler according to the invention can be subjected to a chemical treatment, in particular to a bleaching operation according to a conventional papermaking technique, without giving rise to any re-agglomeration.
- the micronized vegetable load according to the invention can be subjected to a chemical treatment or associated with an organic or mineral, natural or synthetic material to give said micronized vegetable load of appearance characteristics that it does not have to natural state and to modify the optional properties of said micronized plant charge or of any material containing said micronized plant charge.
- These characteristics appearance relate in particular to whiteness, opacity, color and regularity of surface.
- chemical treatment is understood here to mean, in particular, bleaching, coloring or any mixture with a mineral or organic, natural or synthetic material, such as for example titanium oxide used as a means of increasing opacity.
- the micronized vegetable filler according to the invention improves the bulk of fibrous materials including in particular paper and cardboard and is favorable to the rigidity of said paper and cardboard.
- the micronized vegetable load according to the invention allows, after incorporation into the aqueous fiber suspension, a significant reduction in dusting and linting by comparison with the other conventional solutions using mechanical, chemical-mechanical and chemical-thermal fluff pastes.
- all plant sources are suitable, in particular the softwood species such as fir, pine, spruce, hardwoods such as birch, beech, hornbeam, chestnut, and others.
- the vegetable source will come from vegetable waste and in particular wood waste.
- Wood waste can for example come from logging (bark, stumps, slash, crowns, small branches which together represent 65% by weight of the standing tree), from the primary or secondary wood processing industry , sawing industry, planing, veneer (crusts, edging, sawdust, planing shavings, scraps of machining, cutting, cutting, slicing and unwinding in parquetry, industrial carpentry, cabinet making, manufacture of particle board and fibrous board).
- Wood waste usable as a vegetable source can also come from the industries of the use or transformation of wood products, in particular light wooden packaging (crates, crates, boxes, trays), and heavy wooden packaging (boxes, pallets, demolition and construction wood and the like). Wood waste can also come from chemical pulp production facilities, these facilities produce sawdust, small chips or matches, which as a general rule must be eliminated in order not to affect the cooking yields and the quality of said pulp.
- the vegetable source can also come from vegetable waste from the harvest of cereals such as notably corn cob.
- the grinding-micronization operation When implementing the preparation process of the invention for the preparation of the micronized vegetable filler, it is important to carry out the grinding-micronization operation at a temperature below 150 ° C. Above 150 ° C, the grinding-micronization operation deeply denatures the composition of the plant source and the resulting plant charge, denaturation by heat treatment above 150 ° C being liable to lead to the re-agglomeration of said micronized vegetable charge. In addition, the grinding-micronization operation at a temperature of the order of 200-400 ° C is likely to cause the ignition of the vegetable source and load.
- the grinding-micronization temperature will be less than or equal to 100 ° C., and better said temperature will be less than or equal to 70 ° C.
- the micronized plant charge according to the invention of natural unbleached color can be subjected to a conventional bleaching treatment in the stationery field in order to obtain a vegetable charge having a desired whiteness. situated for example between 60 and 90 degrees of white (the measurement of the degree of white being carried out in accordance with the determination of the factor of
- the unbleached micronized vegetable filler can be subjected to a coloring treatment with conventional dyes from the stationery industry, in particular by means of cationic basic dyes with good affinity for unbleached vegetable matter.
- material is meant here any paper product such as pulp, paper, cardboard, sheets, rolls or any other form of complexes and particularly any product for domestic and sanitary use known as “dish” presented in sheets or reels, or any product called “fluff”, that is to say any complex product composed of various ingredients arranged around or in an absorbent mattress composed partially or entirely of defibrated wood pulp “fluff”, on the one hand, and any product not stationer chosen from the group consisting of composites, paints, coatings, coatings and construction articles, on the other hand.
- this new micronized plant charge is its excellent ability to disperse or paste in water at very variable concentrations, and this feature will in particular be advantageously exploited according to the invention for the coloring of the plant charge. with small amounts of water (the vegetable load / colorant pasting can be carried out at a concentration greater than 60% and in particular at a concentration of 70-80%).
- This feature will be advantageously exploited according to the invention for the manufacture of paints, coatings or solutions (aqueous or non-aqueous) for impregnation or coating, on the one hand, but also for the manufacture of composites or materials colored low density, on the other hand.
- micronized vegetable filler according to the invention can be combined, as a paper filler, with other conventional additives in the paper and cardboard industry, such as in particular mineral fillers, bonding agents, resins and polymers for reinforcing mechanical properties in the dry or wet state, retention agents, etc.
- micronized vegetable filler according to the invention can be combined with all organic or synthetic paper fibers, that said paper fibers are alone or mixed together. It is therefore in particular possible to introduce the micronized vegetable filler according to the invention into a mixture of fibers made up of so-called recovery cellulose fibers or into a mixture of recovery cellulose fibers and noble cellulosic fibers.
- the micronized vegetable filler according to the invention can be introduced into the pulp before the manufacture of fibrous sheets, or into the aqueous suspension of fibers at the head circuits of the paper machine during the manufacture of said sheets. fibrous.
- said micronized vegetable filler can be incorporated into the dough before or after refining of said dough.
- All the known devices for the manufacture of fibrous sheets, such as paper, cardboard and nonwovens, are suitable for the use of the micronized vegetable load according to the invention, such as for example machines at one table or with several flat tables, machines with single-jet or multi-jet formation, machines with inclined or vertical formation.
- the weight ratio of pulverulent plant charge / fibers according to the invention will generally be in the range from 1/100 to 6/1.
- a vegetable / fiber weight ratio in the range of 1/100 to 2/10 (and better still from 1/100 to 1/10) will be used, for that of printing media.
- the fibers which can be used for these various applications are in particular natural or synthetic organic fibers such as cellulosic fibers, polyamide fibers, polyester, polyalkylene fibers, polyacrylate fibers, mineral fibers such as glass fibers, ceramic fibers, acicular gypsum fibers, carbon fibers and rock wool, and finally regeneration fibers cellulose. These fibers can be used alone or as a mixture.
- the most commonly used fibers will be cellulosic fibers originating from kraft or bisulfite chemical pulps, mechanical, thermomechanical or chemico-thermomechanical pulps. These pastes produced from softwood or hardwood species can be unbleached, semi-bleached or bleached.
- cellulosic pulps called recovery from old paper (such as print-writing media, newspapers, cardboard boxes, packaging paper, magazines and the like), alone or in combination with fibers.
- noble cellulosics as indicated above.
- the vegetable fillers of controlled particle size can be associated with other organic or synthetic mineral fillers or their mixtures, these fillers or pigments customary or special from the stationery industry are those which have already been mentioned above.
- the plant charge will replace part of the essential ingredient of the material, namely fibers in the paper industry, on the one hand, and will be able to replace all or only a fraction of the charge. usual including mineral material, on the other hand.
- micronized vegetable filler can also usefully intervene in the composition of household and sanitary papers as a replacement for part or all of the mechanical, thermomechanical and CTMP pulps.
- the micronized vegetable load can also replace in particular
- the surface and absorption properties of the micronized vegetable filler also allow prior fixing of the binding agent, mainly starch binders, on the vegetable filler for the overall optimization of the mechanical performance of the final product.
- micronized vegetable filler according to the invention confers an improvement in the bulk and rigidity of the packaging papers with a very favorable impact on the cost price.
- manufacture of kraft fibrous sheets, unbleached or whitened manufacture of flexible packaging, of pouches, envelopes, "kraft liner” and “test liner”
- the vegetable load is also interesting in the manufacture of printing-writing papers with or without wood, magazine papers, L.W.C.
- said vegetable charge in particular allows the regulation of the formation of the fibrous sheet to be regulated while promoting bulk and opacity.
- the manufacture of multi-jet cartons is also in the field where the vegetable load according to the invention favorably satisfies a large number of important applications in particular with regard to the technical and economic plans.
- the micronized vegetable filler according to the invention offers the advantage of dispersing or of becoming very easily impaled in water without any particular additive, in particular up to concentrations up to 85% of dry extract. This property is advantageously used in the field of coloring of said vegetable charge, on the one hand, and in the manufacture of paints and coatings comprising said vegetable charge.
- the unbleached, bleached or colored vegetable load confers on the material into which it is introduced or on which it is applied, particular properties of appearance, bulk, opacity and may, as required, contribute to the improvement of sound, thermal and electrical insulation properties.
- the plant filler which is the subject of the invention can also bring a certain number of advantages in the manufacture of filtration papers: homogeneity of the porometric properties, increase in the absorbing power, reduction of linting, dusting, by better optimization of the refining and reduction of the cost of composition, because these papers are produced from expensive special pulp and delicate processing.
- the quantity of vegetable fillers which is recommended is in particular from 2 to 8% relative to the weight of the fibers. At this quantity and at an appropriate level of refining, the vegetable fillers can also increase the porosity of the papers and this result is appreciated for the manufacture of certain packaging krafts, such as in particular the krafts for large capacity bags.
- the micronized vegetable filler will replace part of the essential ingredient of the material, namely paper fibers, on the one hand, but also depending on the destination, part of the other ingredients of the composition of the fibrous sheet such as fillers, mineral and organic pigments, opacifying agents and the like, on the other hand.
- the process for preparing a fibrous sheet which is recommended according to the invention by the papermaking process and which comprises the aqueous dispersion of fibers and a micronized plant filler, is characterized in that said porous and micronized plant filler
- (1) has, at a residual moisture content of less than 20% and preferably less than 15%, (1a) a particle size d 95 of less than 200 micrometers (that is to say that at least 95% in
- (1d) a density of less than 500 kg / m and preferably less than or equal to 300 kg / m 3 ;
- the vegetable filler has been previously incorporated into the fibrous pulp or is introduced into the aqueous suspension of fibers during the operations for manufacturing the material.
- said vegetable charge is likely to have been bleached, colored or to have undergone a particular chemical treatment to obtain specific properties.
- table A lists the units and standards for assessing the characteristics of paper and board.
- micronized vegetable fillers according to the invention The influence of the incorporation of micronized vegetable fillers according to the invention on the absorption properties of a paper pulp used in products for household and sanitary uses has been evaluated.
- Hydraulic specific surface 0.55 m 2 / g.
- Density 300 kg / m 3 .
- Hydraulic specific surface 0.52 m 2 / g.
- Whiteness 70% obtained by bleaching with 4% hydrogen peroxide, with 2% soda, 3% silicate and 0.25% DTPA.
- Dough 1 unbleached kraft of maritime pine from the Austin.
- Pulp 3 Swedish softwood CTMP pulp
- compositions used and the results obtained are listed in Tables 1, 2 and 3 below.
- the loss of whiteness measured with the Suntest UV filter for 30 minutes on the CTMP paste is 4 to 6 points while the loss of whiteness is 2.5 points on the unbleached natural vegetable load.
- Tissue paper is prepared from a weakly refined bleached softwood and leafy Kraft fibrous composition, in which a certain content of bleached vegetable fillers CV2 of the type used in the previous series of tests with other adjuvants is incorporated. usual for this product: softening and shading agents and the characteristics of this paper are checked in relation to a fabric of conventional formulation. These compositions and results are shown in Table 4 below.
- the low specific surface area of the plant charge allows a slight increase in the refining of the dough without harming the absorption and resistance properties of the final product.
- the composition comprising the micronized vegetable filler according to the invention is more economical.
- the sheets are produced on a pilot machine.
- the plant load is favorable for the hand, with improved physical characteristics. This new formulation drips better and is more economical.
- a paper with vegetable fillers is prepared in order to improve the bulk and the rigidity and compared to a conventional formula.
- the sheets are drawn on a dynamic form.
- Table 6 below highlights the advantage of using the micronized vegetable filler according to the invention.
- the micronized vegetable filler is used as an additive for improving productivity (reduction of linting and clogging of coatings) and mechanical performance.
- This colored vegetable charge is useful in many materials: composites, building materials, coatings for the reduction in particular of the density or of obtaining specific properties: thermal, acoustic, electrical insulation.
- a pinched composition for coating is prepared containing a micronized vegetable filler according to the invention, in order to improve the insulation properties of the coated material and to reduce the density.
- Alumina hydrate 20 parts by weight
- Acrylic dispersant 0.15 parts by weight
- Polyvinyl alcohol 4 parts by weight
- Acrylic binder 20 parts by weight
- Carboxymethylcellulose 3 parts by weight
- One part of the kaolin is replaced by 20 parts by weight of vegetable filler CV2. This substitution does not affect the rheological properties of the coating bath and the coating allows a decrease in the density of the coated material and improves its characteristics of dimensional stability and insulation.
- the present series of tests relates to obtaining a kraft intended for the impregnation of phenolic resins for laminated panels.
- the compositions and results are shown in Table 7.
- the micronized vegetable load contributes in said series of tests to a significant improvement of the hand and of the absorption characteristics with identical physical properties. This result is interesting for productivity, the new composition according to the invention with CV1 also allows a significant reduction in the price.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Paper (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90909461T ATE97457T1 (de) | 1989-06-15 | 1990-06-13 | Poroeser, wenigdichter mikronisierter pflanzlicher fuellstoff mit kontrollierter granulometrie und kleinen physikalischen und hydraulischen oberflaechenkennzahlen und verfahren zu seiner herstellung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8907963A FR2648488B1 (fr) | 1989-06-15 | 1989-06-15 | Charge vegetale poreuse, micronisee, peu dense, de granulometrie controlee et de faibles surfaces specifiques physique et hydraulique; procede de preparation et utilisation |
FR8907963 | 1989-06-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0433413A1 true EP0433413A1 (fr) | 1991-06-26 |
EP0433413B1 EP0433413B1 (fr) | 1993-11-18 |
Family
ID=9382767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900909461 Expired - Lifetime EP0433413B1 (fr) | 1989-06-15 | 1990-06-13 | Charge vegetale poreuse, micronisee, peu dense, de granulometrie controlee et de faibles surfaces specifiques physique et hydraulique, procede de preparation et utilisation |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0433413B1 (fr) |
BR (1) | BR9006808A (fr) |
CA (1) | CA2034507A1 (fr) |
DE (1) | DE69004671T2 (fr) |
ES (1) | ES2049035T3 (fr) |
FI (1) | FI910700A0 (fr) |
FR (1) | FR2648488B1 (fr) |
WO (1) | WO1990015900A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4202598C1 (fr) * | 1992-01-30 | 1993-09-02 | Stora Feldmuehle Ag, 4000 Duesseldorf, De | |
FR2729096A1 (fr) * | 1995-01-06 | 1996-07-12 | Atochem Elf Sa | Procede de blanchiment d'une poudre vegetale micronisee |
FI20075954L (fi) * | 2007-12-21 | 2009-06-22 | Upm Kymmene Oyj | Menetelmä orgaanisen pigmentin valmistamiseksi |
EP3055454A4 (fr) | 2013-10-11 | 2017-07-12 | UPM-Kymmene Corporation | Procédé de fabrication d'un papier, papier et son utilisation, composition de fabrication et composition à base de bois |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2362528A (en) * | 1942-06-03 | 1944-11-14 | Libbey Owens Ford Glass Co | Preparation of fine cellulose flour |
FR2612828A1 (fr) * | 1987-03-24 | 1988-09-30 | Louche Yves | Utilisation de bois micronise et seche comme agent d'amelioration des caracteristiques des pates a papier, papiers, cartons et panneaux de particules de bois |
-
1989
- 1989-06-15 FR FR8907963A patent/FR2648488B1/fr not_active Expired - Lifetime
-
1990
- 1990-06-13 DE DE90909461T patent/DE69004671T2/de not_active Expired - Lifetime
- 1990-06-13 EP EP19900909461 patent/EP0433413B1/fr not_active Expired - Lifetime
- 1990-06-13 CA CA 2034507 patent/CA2034507A1/fr not_active Abandoned
- 1990-06-13 ES ES90909461T patent/ES2049035T3/es not_active Expired - Lifetime
- 1990-06-13 BR BR909006808A patent/BR9006808A/pt unknown
- 1990-06-13 WO PCT/FR1990/000419 patent/WO1990015900A1/fr active IP Right Grant
-
1991
- 1991-02-13 FI FI910700A patent/FI910700A0/fi not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9015900A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69004671D1 (de) | 1993-12-23 |
FI910700A0 (fi) | 1991-02-13 |
CA2034507A1 (fr) | 1990-12-16 |
EP0433413B1 (fr) | 1993-11-18 |
FR2648488A1 (fr) | 1990-12-21 |
FR2648488B1 (fr) | 1991-09-13 |
ES2049035T3 (es) | 1994-04-01 |
BR9006808A (pt) | 1991-08-06 |
DE69004671T2 (de) | 1994-03-24 |
WO1990015900A1 (fr) | 1990-12-27 |
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