AU2001296904A1 - Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials - Google Patents
Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materialsInfo
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Description
METHOD AND APPARATUS FOR REDUCING IMPURITIES
IN CELLULOSE FIBERS FOR MANUFACTURE OF FIBER
REINFORCED CEMENT COMPOSITE MATERIALS
Background of the Invention Field of the Invention
This invention relates to cellulose fibers, and more particularly, to a method of reducing impurities in cellulose fibers. This invention also discloses the formulations, methods of manufacture and final products of cellulose fiber reinforced cement composite materials using low impurity cellulose fibers. Description of the Related Art
Fiber-reinforced products such as building sheets, panels, planks, and roofing material have been used in the building construction for more than one hundred years. The reinforcement fibers used in such building products include asbestos fibers, cellulose fibers such as those described in Australian Patent No. 515151 and U.S. Patent No. 6,030,447, the entirety of whiϋh is hereby incorporated by reference, metal fibers, and glass fibers and other natural and synthetic fibers. Presently, cellulose is one of the preferred fibers used in most commercial fiber-reinforced building materials because cellulose fiber is an effective, low cost, recyclable natural product compatible with most conventional fiber cement manufacturing processes, including refining and autoclaving.
However, the properties and performance characteristics of most fiber reinforced cement composite materials are highly dependent on the quality of the fibers used. For example, cellulose fibers sometimes contain impurities that can adversely affect the fiber cement composite properties. In particular, harmful organic compounds are sometimes trapped inside the pores and cavities of the cellulose pulp during the pulping process. These organic compounds include lignin and other aromatic components, wood sugar compounds including hextoses (glucose, mannose, and galactose) and pentoses (xylose and arabinose), wood sugar derivatives such as gluconic acid and mannonic acids, fatty acids, resin acids, other organic compounds from wood including extractives and degradation fragments of cellulose, hemicellulose and lignin- In addition to organic compounds, the impurities may
also include small amounts of inorganic compounds that are oxidized- These impurities are sometimes collectively referred to as Chemical Oxygen Demand (COD) components.
Each COD component has a certain degree of negative impact on fiber cement reactions, particularly the cement hydration process. The collective effect of all COD compounds released from the pulp in the manufacture of fiber cement composite materials can significantly weaken the bonding between cellulose fibers and other inorganic ingredients in the fiber cement matrix, in which cellulose fibers are typically used as the reinforcement agent. This phenomenon is sometimes referred to as cement poisoning. Moreover, accumulation of the COD impurities released from the pulp can severely contaminate the process water during the manufacture of the fiber reinforced cement composite materials. These adverse effects associated with COD impurities can ultimately result in failure of the final fiber cement products.
To address these problems, most conventional pulp manufacturing processes include a series of cleaning steps that are designed to remove residual chemicals and degraded wood components contained in the pulp. During these cleaning steps, the pulp is typically washed in a series of vacuum, rotary or pressure brown stock washers at a temperature of about 55°C to 65°C to remove the residual chemicals from the pulp. However, these processes often fail to remove all COD impurities from the cellulose pulp because of the relatively short retention time and limited washing efficiency. In many cases, a large amount of COD substances remains trapped inside the cavities (lumens) and pores of the fiber cell walls and are carried over to the fiber cement manufacturing processes, which can detrimentally affect the properties of the final product and severely contaminate the process water.
Hence, from the foregoing, it will be appreciated that there is a need for a process that removes substantially all impurities from cellulose fibers during the pulping process. There is also a need for a process of manufacturing low impurity and high performance cellulose fibers for fiber reinforced cement composite materials. To this end, there is a particular need for a cellulose pulp manufacturing process that significantly reduces the amount of COD components in the pulp and can be implemented by using conventional pulp manufacturing equipment.
Summary of the Invention
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In one aspect, the preferred embodiments of the present invention disclose a process of making low impurity and high performance fibers for cellulose fiber reinforced cement composite materials. The preferred process comprises processing the fibers in an aqueous solution for a predetermined retention time under elevated temperature conditions and providing agitation to the solution so as to facilitate diffusion of impurities from the pores and lumens of the fibers. In one embodiment, the fibers are soaked and washed counter- currently in the solution. Preferably, the solution temperature is between about 65°C to 120°C. Preferably, the retention time is between about 1 to 36 hours. In one embodiment, processing the fibers comprises soaking the fibers in a series of washing systems, preferably, for about 30 minutes to 2 hours in each of the series of washing systems.
In another embodiment, processing the fibers comprises soaking the fibers in up to six reactors. The reactors may be bleaching towers or a series of continuous plug flow bleaching reactors. The fibers can be soaked in a bleaching reactors followed by soaking in a bleached stock washer. Preferably, the process removes a large portion of the impurities, such as COD compounds, from the pulps. In one embodiment, processing the fibers comprises introducing at least one chemical to the solution, wherein the chemical reacts with the COD compounds and causes the compounds to become more soluble in the aqueous solution. The chemicals can be selected from the group consisting of chemicals comprising oxygen, ozone, hydrogen peroxide, and mixtures thereof. Furthermore, the fibers can be washed in a brown stock washer system, preferably at an elevated temperature of greater than about 65°C, prior to processing the fibers. Preferably, the pulps are maintained at a pulp consistency of about 1% to 30%. During the prolonged soaking cycles, impurities in the pulps will diffuse from inside of the fiber cell walls driven by the concentration gradients. Furthermore, elevated temperatures also significantly increase the diffusion transportation rate of the impurities-
The process of the preferred embodiments can be carried out using various schemes and equipment systems such as existing bleaching and washing system in most pulp mills. Preferably, the washing systems are selected from the group consisting of washers, storage tanks, reactors, mixers, agitators, pumps, centrifuges, and filter presses. The washing systems may include bleaching reactors, bleached stock washers, pulp transport pumps, pulp dispersion/diffusion screw feeders, stock mixers and agitators, bleached stock storage towers, and bleached stock deckers.
The process described herein is particularly innovative because the conventional wisdom in the fiber processing industry actually teaches away from the use of high temperature, lengthy soaking cycles and mechanical agitation in cleaning pulps for the applications in the fiber cement composite material. It is generally believed that high temperature, prolonged soaking, and mechanical actions will reduce the fiber strengths, such as tensile strengths. Contrary to customary wisdom, preferred embodiments of this invention show that washing pulps at an elevated temperature under preferred conditions can effectively remove more impurities from the fiber pulps without compromising the fiber strength and other desirable fiber properties. For example, COD contents in the pulps processed by the preferred methods can be reduced by more than about 40%, resulting in a COD content of less than about 5 kg/ton of oven dry fiber. Application of the high purity fiber with a COD content of less than about 5 kg/ton of pulp in the manufacture of fiber reinforced cement composite materials actually improves the physical and mechanical properties of the fiber cement composite materials, such as modulus of rupture ( OR), modulus of elasticity (MOE), ultimate strain and toughness energy- Furthermore, use of the low COD fibers can also greatly reduce contamination of the process water during the manufacture of fiber reinforced cement composite materials.
Advantageously, the process of the preferred embodiments provides a cost effective method of removing substantially all impurities, such as COD components, from the fibers. The process can be performed using existing equipment available in most pulp mills. Furthermore, application of this process in the manufacture of fiber cement grade pulps can reduce the COD content by up to one half or more without degrading the physical and mechanical properties of the fibers. Use of the low COD pulp in the manufacture of fiber cement composite materials will result in less contamination to the process water and reduce the fresh water usage.
The preferred embodiments of the present invention also disclose a formulation for making fiber reinforced cement composite materials with low COD fibers. One preferred formulation of the present invention is as follows:
• about 2% to 20% low COD cellulose fibers (or a combination of low COD fibers, natural inorganic fibers; and/or synthetic fibers);
» about 10% to 80% cementitious or other hydraulic binders;
• about 20% to 80%) silica or other aggregates;
• about 0% to 50%) lightweight density modifiers; and
• about 0%o to 10% additives.
The preferred embodiments of the present invention disclose a method of manufacturing a fiber reinforced composite material using low COD fibers. The first step of this method is to prepare a low COD fiber by reducing impurities in cellulose fibers. This is preferably accomplished by treating the fibers in an aqueous solution for a predetermined reaction time, while maintaining the solution temperature greater than about 65°C, and providing agitation to the solution so as to facilitate diffusion of impurities from the pores and lumens of the fibers. The method of manufacturing fiber cement in accordance with the embodiments preferably includes the steps identified above, and the following additional steps:
• processing (fiberizing, dispersing, defibrillating, etc.) the low COD fiber;
• mixing the fibers with a cementitious binder and other ingredients to form a fiber cement mixture;
• forming the fiber cement mixture into a fiber cement article of a pre-selected shape and size; and
• curing the fiber cement article so as to form the fiber reinforced composite building material.
In another aspect of the present invention, a pulping process is provided. This process comprises providing a delignified fiber substance and converting the fiber substance into fiber pulps. The pulps are washed at elevated temperatures greater than about 65°C in a manner so as to remove a large portion of COD components from the pulps. The pulps are processed in additional washing cycles to remove substantially all remaining COD impurities.
The advantages of using the low COD fibers in the manufacture of fiber reinforced cement composite materials in accordance with the preferred formulations and processes include but are not limited to:
• improvements in mechanical and physical properties such as modulus of rupture (MOR), modulus of elasticity (MOE), ultimate strain and toughness energy;
• less process water contamination due to the impurities dissolved from the cellulose pulps and less fresh water required;
• less fibers are required to achieve the same reinforcement efficiencies.
These and other objectives and advantages will become apparent from the following description taken in conjunction with the accompanying drawings.
Brief Description of the Drawings
FIGURE 1 is a flow chart of a preferred process of manufacturing fiber cement grade cellulose pulps in which the COD content in cellulose pulps is substantially reduced;
FIGURE 2 is a flow chart of a preferred process of manufacturing fiber reinforced cement composite materials incorporating the low COD and high purity fibers;
FIGURE 3 illustrate the relationship between COD content in the pulps and the strength of the final fiber cement products and level of contamination in the process water during the manufacture of the fiber cement materials.
Detailed Description of the Preferred Embodiments
The preferred embodiments of the present invention describe the preparation and application of low impurity fibers in cementitious fiber reinforced composite materials. These embodiments encompass not only the method of removing COD components from fibers, but also the formulation and the methods of manufacture of fiber reinforced composite materials formed from low COD and high purity fibers, as well as the properties of the final products. The treatment to remove impurities from pulps can also be implemented in conjunction with other fiber treatments, such as sizing of fibers to improve their hydrophobicity, loading of fibers and biocide treatment of fibers. It will be appreciated that the aspects of the present invention are not applicable solely to cellulose fiber reinforced cementitious products, and accordingly, the techniques described herein may be applied to building materials reinforced with other fibers in non-cement products as well.
Figure 1 illustrates a preferred process 100 for manufacturing fiber-cement grades of low impurity and high performance cellulose pulps. The process 100 begins with step 102 in which fibrous materials such as wood chips are loaded into a digester/reactor for delignification. After the wood chips are loaded into the digester(s), a selected amount of one or more chemicals are introduced to the digester(s) in step 104 to facilitate the delignification reactions. Dependent on the pulping processes, the chemicals may include sodium hydroxide, sodium hydroxide with sodium sulfate, sodium hydroxide with sodium sulfate plus additive AQ, sodium hydroxide plus additive AQ, and sulfur dioxide.
Preferably, the delignification reaction occurs in the digester(s) under high temperature conditions between about 150°C to 250°C for about 30 minutes to 5 hours. In some embodiments, process conditions such as alkali usage, cooking temperature or target Kappa numbers, etc. in the digester may be adjusted to accommodate the subsequent washing steps.
As shown in Figure 1, subsequent to the delignification reaction, the processed wood chips are discharged from the digester to a tank in step 106, utilizing the high- pressure differentiation inside and outside of the digester. With help of chip expansion due to the pressure drop, the processed chips are separated into individual fibers known as pulp during the discharge. The pulp formed at this stage is typically brown in color and thus commonly known as brown stock.
As Figure 1 further illustrates the pulp subsequently undergoes a series of washing steps in step 108. Preferably, the pulp is washed in counter-current by a series of vacuum, rotary or pressurized brown stock washers at an elevated temperature to remove a large portion of the residual chemicals and degraded wood components contained in the pulp. Unlike conventional pulp washing cycles that are typically carried out without applying any heat, the preferred washing process is carried out at elevated temperatures, preferably greater than about 65°C, more preferably between about 65°C and 120°C, which can be conveniently implemented using existing equipment and does not cause any substantial damage to the fibers. Some chemicals may also be added in this step to facilitate the washing and increase the washing efficiency. The chemicals that can be used include oxygen, ozone, and hydrogen peroxide, etc. A majority of the impurities residing outsides of fibers can be removed by this step.
Following the washing step 108, the process 100 further includes an additional diffusion washing process in step 110 in which the pulp is subject to further intensive washing to remove substantially all of the remaining impurities, such as COD components, that have not been removed by the brown stock washers. Preferably, the pulp is subject to an intensive counter-current washing scheme at normal or elevated temperatures with mild mechanical agitations. The extensive washing can be carried out by using a variety of different washing systems such as washers, storage tanks, reactors, mixers, agitators, pumps, centrifuges, filter presses or any combinations of these systems. In a preferred embodiment, the washing is performed using the existing equipment in the bleaching plants
of most fiber cement pulp mills. In particular, the equipment used may include, but is not limited to, the following:
• bleaching reactors;
• bleached stock washers;
• pulp screw feeders;
• stock mixers/agitators;
• bleached stock storage towers;
• bleached stock deckers; and
• medium and low consistency pumps.
Preferably, heated fresh water is introduced to the washer system counter-currently to minimize water usage and maximize washing efficiency. Furthermore, the COD containing spent water from the washers is preferably transported to a water treatment plant or chemical recovery system.
In one embodiment, step 110 comprises soaking the pulp in a series of continuous plug flow or semi-continuous bleaching reactors for a prolonged duration at an elevated temperature between about 65°C to 120°C for a retention time of between about 30 minutes to 2 hours in each of the reactors followed by a dewatering process after each reactor. Preferably, each reactor is followed by a washing system to remove the COD containing water. The cumulative retention time of the pulp in all reactors preferably does not exceed about 36 hours, more preferably between about 2 to 30 hours. This allows substantially all CODs and other impurities to diffuse out of the fibers without compromising the fiber strength. Furthermore, the pulp in the reactors is preferably maintained at a pulp consistency of about 1% to 30%. Advantageously, the high temperature washing coupled with the prolonged retention time allows the remaining CODs and other impurities to diffuse out from inside of the fiber cell walls and lumens. Furthermore, mechanical agitation provided by the bleaching reactors also facilitates the removal of the COD components and other impurities from the pulp.
In another embodiment, step 1 10 comprises processing the pulp through a bleached stock washer followed by one or more bleaching reactors. The bleached stock washer may be vacuum, pressure, rotary or diffusion types and is utilized to further separate COD compounds from the fiber. The bleached stock reaGtor may include those used for oxygen delignification, chlorination, alkaline extraction, chloride dioxide bleaching, hyperchlorite
bleaching, ozone bleaching, hydrogen peroxide bleaching, sodium peroxide bleaching and the like. To increase the efficiency of COD removal, the pulp is preferably processed through multiple pairs of bleaching reactors and bleached stock washers in series and/or in parallel.
In yet another embodiment, chemicals are introduced into the pulp slurry during the extensive washing process of step 110 to facilitate the removal of the COD impurities during washing. Preferably, the chemical(s) selectively react with the COD components and break the components down into smaller fragments. The chemicals may comprise oxygen, ozone, hydrogen peroxide, or any others that are capable of reacting with COD compounds and causing the compounds to become more soluble in aqueous solutions. Advantageously, the addition of these chemicals in the extensive washing process of step 110 significantly increases the efficiency of COD removal. Furthermore, the extensive washing process of step 110 can be applied to a variety of different pulping processes including, but not limited to:
Kraft;
Kraft-AQ;
• Soda;
• Soda-AQ;
• Kraft-Oxygen;
• Oxygen Delignification;
• Organic Solvent Pulping;
• Sulfite Pulping;
• Steam Explosion Pulping; and
• Other pulping techniques.
Following the extensive washing process of step 110, the pulp is transported to pulp machines to form pulp laps or rolls in step 112 for making fiber reinforced cement composite materials.
Table 1 illustrates a comparison between the fiber properties of pulp processed by the pulp manufacturing process of the preferred embodiments and those processed by conventional regular temperature washing techniques. In this particular example, the wood species was predominantly Douglas fir (> 90%) and the pulping process used was Kraft. For pulp samples made in accordance with the preferred process, six bleaching reactors
including oxygen delignification and peroxide bleaching reactors and the corresponding washer systems in series were used to process the pulp following the brown stock washing- No chemicals were introduced during the extensive washing process- The total retention time in the extensive washing process was about 12 hours and the washing temperature was between about 90°C to 98°C. For pulp samples made in accordance with the conventional washing techniques, the same washing cycle was used with the same retention time of 12 hours. However, the washing temperature was between about 55°C to 60°C.
Table 1: Key Properties of Fibers Made from Normal and Preferred Processes
As shown in Table 1 , the extensive washing at an elevated temperature reduces the COD content and sodium content of the pulp by about 50%>. The COD and sodium contents are general indications of pulp cleanliness or extensiveness of washing- The COD content was measured by first dispersing the fiber into 0.0 IN NaOH solution, blending the solution for about 10 minutes at about 3200 rpm, then filtering the pulp with Watman #3 qualitative filter paper to obtain the filtrate, and measuring the COD content of the filtrate in accordance with Hach Method 8000 (dichromate reactor digestion and colorimetric measurement). The sodium content was measured in accordance with TAPPI method T 266 om-88 (TAPPI: Technical Association of Pulp & Paper Industry, USA).
Furthermore, as Table 1 shows, the extensive washing process of the preferred embodiment did not compromise critical fiber properties such as fiber length and fiber strength as the values for these two properties remain substantially the same for samples processed through the extensive washing process at the elevated temperature and those processed through the conventional washing cycles. The weighted average fiber length
was measured by FS-200 (a fiber analyzer manufactured by Valmet). The zero span tensile (ZST) fiber strength was tested in accordance with TAPPI method T231 cm-85. Advantageously, the pulping process of the preferred embodiments can be applied to the manufacture of fiber cement grade pulps and can reduce the COD content of the fiber pulps by about 50% or more without adversely affecting key fiber physical and mechanical properties. It will be appreciated that pulp COD content can be reduced by about 20% or more under appropriate conditions- Furthermore, the pulp manufacturing process can be implemented in a cost-effective manner using existing equipment and processes in most fiber cement processing mills.
One preferred formulation of the fiber reinforced composite material comprises a cementitious binder, an aggregate, low COD and high purity cellulose fibers, density modifiers, and various additives to improve different material properties. It will be appreciated that not all of these components are necessary to formulate a suitable building product, and thus, in certain embodiments, the formulation may simply comprise cementitious binder and low COD cellulose fibers. Most of the embodiments described herein can be encompassed by the following formulation:
• • about 10%-80% cementitious binder;
• about 20%-80% silica (aggregates);
• about 0%-80% density modifiers;
• about 0%-10% additives; and
• about 0.5%-20% low COD and high purity cellulose fibers or a combination of low COD cellulose fibers and/or natural inorganic fibers, and/or synthetic fibers; and/or regular cellulose fibers.
A low COD fiber preferably refers to a fiber having a COD content less than about 5 kg/ton, more preferably less than about 3.5 kg/ton of pulp.
The cementitious binder is preferably Portland cement but can also be, but is not limited to, high alumina cement, lime, high phosphate cement, and ground granulated blast furnace slag cement, or mixtures thereof.
The aggregate is preferably ground silica sand but can also be, but is not limited to, amorphous silica, micro silica, geothermal silica, diatomaceous earth, coal combustion fly and bottom ashes, rice hull ash, blast furnace slag, granulated slag, steel slag, mineral
oxides, mineral hydroxides, clays, magnasite or dolomite, metal oxides and hydroxides, and polymeric beads, or mixtures thereof.
The density modifiers can be organic and/or inorganic lightweight materials with a density of less than about 1.5 g/cm3. The density modifiers may include plastic materials, expanded polystyrene, other foamed polymer materials, glass and ceramic materials, calcium silicate hydrates, microspheres and volcanic ashes including perlite, pumice, shirasu, zeolites in expanded forms. The density modifiers can be natural or synthetic materials.
The additives can include, but are not limited to, viscosity modifiers, fire retardant, waterproofing agents, silica fume, geothermal silica, thickeners, pigments, colorants, plasticizers, dispersants, forming agents, flocculent, drainage aids, wet and dry strength aids, silicone materials, aluminum powder, clay, kaolin, alumina trihydrate, mica, metakaolin, calcium carbonate, wollastonite, and polymeric resin emulsion, or mixtures thereof.
The low COD and high purity cellulose fibers are preferably individualized fibers, and are unrefmed/unfibrillated or refined/fibrillated cellulose pulps from sources, including but not limited to bleached, unbleached, semi-bleached cellulose pulp produced by pulping processes such as Kraft, Kraft-AQ, oxygen delignification, organic solvent pulping, sulfite pulping, steam explosion pulping or any other pulping techniques. The cellulose pulps can be made of softwood, hardwood, agricultural raw materials, recycled waste paper or any other forms of lignocellulosic materials.
Preferably, the low COD and high purity fibers have a freeness of 150 to 600 degrees of Canadian Standard Freeness (CSF) in accordance with TAPPI method T 227 om-99. The cement and silica preferably have surface areas of about 250 to 400 m2/kg and about 300 to 450 nr/kg, respectively- The surface area for both the cement and silica is tested in accordance with ASTM C204-96a. Test Results — Mechanical & Physical Properties
Applications of low COD and high purity fibers in fiber reinforced composite materials desirably improve the mechanical and physical properties of the final building product. Fiber cement products using low COD and high purity cellulose fibers have improved physical and mechanical properties.
- 1 ?.-
Table 2: Key Mechanical Properties of Fiber Cement Composite Materials Using Low COD Cellulose Fiber and High COD Cellulose Fiber
Table 2 above provides an illustrative comparison of various mechanical and physical properties of fiber cement products made with formulations that incorporate low COD fibers made in accordance with preferred embodiments and those that use conventional cellulose fibers. Prototype samples of fiber cement materials are produced based on two equivalent formulations (A and B). An equivalent formulation is herein defined as one in which the preferred low COD fibers are displaced by an equivalent percentage of conventional cellulose fibers. Formulations A and B each comprises about 35%o Portland cement, about 55% silica and about 10% fibers. Formulation A contains high COD fibers while Formulation B incorporates low COD fibers. Other key properties for the fibers were the same for both formulations: fiber length, about 2.58 mm; Kappa number, about 26; and freeness, about 472 CSF. The Kappa and freeness were measured in accordance with TAPPI method T236 and T 227 om-99, respectively. Both fibers were made from the wood species predominately Douglas fir (>90%) by Kraft process. The fibers were first refined to the pre-determined freeness at 4% consistency, mixed with other ingredients and formed into articles. The articles were then pre-cured at ambient temperature for 12 hours and then autoclaved for 12 hours at 180°C. All mechanical properties were tested under the wet condition in accordance with ASTM (American Standard Test Method) C1185-98a entitled "Standard Test Methods of Sampling and Testing Non-Asbestos Fiber-Cement Flat Sheet, Roofing and Siding Shingles, and Clapboards."
Table 2 shows that incorporation of low COD fibers in the fiber cement matrix can significantly improve the key physical and mechanical properties of the fiber cement composite materials as compared to samples made with an equivalent formulation that does not contain low COD fibers. For example, the low COD fibers improve the modulus of rupture (MOR) by about 44%o, modulus of elasticity (MOE) by about 46%, ultimate strain by about 54%, and toughness by about 40%.
It will be appreciated that by varying the washing and/or other process conditions, and accordingly by lowering the COD content in the fibers, the improvement in these and other properties can be selectively controlled. Thus, in one embodiment, the low COD fibers can improve the MOR by about 10% or more, more preferably by about 20%> or more, as compared to an equivalent formulation made with high COD (i.e., equal or higher than 5 kg/ton of pulp). Similarly, the low COD fibers can improve the MOE by about 10% or more, more preferably by about 20%) or more. The low COD fibers can also improve the ultimate strain by about 10% or more, more preferably by about 20%o or more. The low COD fibers can also improve the toughness of the composite building material by about 10%) or more, more preferably by about 20%o or more.
Due to the high reinforcement efficiency of low COD fibers, a smaller amount of the low COD and high purity fiber may be required to achieve the same reinforcement efficiency, compared to the regular fibers. It can be appreciated that the advantages of incorporating the low COD and high purity fibers in the fiber cement composite materials may not be limited to the above formulations and properties.
A preferred method of manufacturing a fiber reinforced composite building material incorporating the low COD fibers described herein above generally comprises the following steps:
© preparing cellulose fibers containing low COD components and other impurities;
» dispersing the low COD and high purity fibers at a pre-selected consistency;
• fibrillating the low COD and high purity fibers to a pre-selected freeness range;
• mixing the low COD and high purity fibers with ingredients to form a fiber cement mixture in accordance with the preferred formulations;
• fabricating/forming the fiber cement mixture into a fiber cement article of a pre-selected shape and size; and
• curing the fiber cement article so as to form the fiber reinforced composite building material-
Preferably, the step of mixing the low COD and high purity fibers with other ingredients to form a fiber cement mixture comprises mixing the low COD and high purity fibers with non-cellulose materials such as a hydraulic binder, aggregate, density modifiers, and additives in accordance with the preferred formulations of this invention. In some embodiments, the low COD and high purity fibers can also be mixed with regular cellulose pulp with high COD contents, natural inorganic fibers and synthetic fibers.
Figure 2 illustrates a preferred process 200 of manufacturing a fiber reinforced cementitious composite material incorporating low COD and high purity cellulose fibers. As Figure 2 shows, the process begins with step 202 in which substantially all impurities in cellulose fibers have been removed in accordance with the methods described herein above. The low COD and high purity fibers are subsequently processed in step 204. The fiber processing step 204 typically involves fiber dispersion and fibrillation. In one embodiment, the fibers are dispersed at a consistency of about 1% to 6%o in a hydra-pulper, which also imparts some fibrillation. Further fibrillation can be achieved using a refiner or series of refiners. Once dispersed, the fibers are then fibrillated to a range of about 100 to 750 degrees of CSF (Canadian Standard Freeness), more preferably between about 180 to 600 degrees of CSF. Dispersion and fibrillation can also be achieved by other techniques such as hammer-milling, deflakering, shredding, and the like. Furthermore, use of fibers without fibrillation is also acceptable for some products and processes. Most of residual COD impurities in the fiber will be released into the process water at this step.
As Figure 2 shows, in step 206, the processed low COD cellulose pulps are proportionally mixed with the other ingredients to form a waterborne mixture, slurry, or paste. In one embodiment, the low COD and high purity cellulose fibers are mixed with cement, silica, a density modifier and other additives in a well-known mixing process to form a slurry or paste. In the mixer natural inorganic and synthetic fibers can be blended with the low COD fibers. The process 200 follows with step 208 in which the mixture may be formed into a "green" or uncured shaped article using a number of conventional manufacturing as would be known to one of skillful in the art, such as:
• Hatschek sheet process;
• Mazza pipe process;
• Magnani process;
• Injection molding;
• Extrusion;
• Hand lay-up;
• Molding;
• Casting;
• Filter pressing;
• Fourdrinier forming;
• Multi-wire forming;
• Gap blade forming;
• Gap roll/blade forming;
• Bel-Roll forming; and
• Others.
These processes may also include a pressing or embossing operation after the article is formed. More preferable, no pressing is used. The processing steps and parameters used to achieve the final product using a Hatschek process are similar to what is described in Australian Patent No. 515151.
Following step 208, the "green" or uncured shaped article is cured in step 210. The article is preferably pre-cured for up to 80 hours, most preferably 24 hours or less. The article is then air-cured for approximately 30 days. More preferably, the pre-cured articles is autoclaved at an elevated temperature and pressure in a steam saturated environment at about 60 to 200°C for about 3 to 30 hours, more preferably about 24 hours or less. The time and temperature chosen for the pre-cure and cure processes are dependent on the formulation, the manufacturing process, the process parameters, and the final form of the product.
Figure 3 shows the effects of COD contents in the pulp on the amount of contaminants released to the process water and the modulus of rupture (MOR) of the fiber reinforced cement composite material. As illustrated in Figure 3, low COD fibers were added at the 0 day mark, and over a 30 day trial, the average COD in the process water and the MOR remained fairly constant. At 30 days, regular fibers were added to the mixture,
resulting in increased contamination of the process water or a large amount of COD released to the process water, and decreased modulus of rupture (MOR) of the final cement product (measured after curing step 210). In particular, the average COD in the process water is about 50 mg/L when low COD fibers are used, while the average COD in the process water can reach as high as about 115 mg/L within weeks of experimental trial after regular fibers are added. Therefore, the use of low COD fibers reduces the amount of COD in the process water by about 50% compared to the use of regular fibers that are not treated as described above. It will be appreciated, however, that a reduction in COD content in the process water of about 10% or more will be significant for improvement in properties of the fiber cement composite materials, and for reducing the fresh water usage in the manufacture process.
The low COD pulp used in the example shown in Figure 3 was made by using the extensive washing technique described in above embodiments. The freeness of the pulps was about 400 CSF. The fiber cement material was fabricated by a Hatschek process and autoclave curing technique. The fiber cement material made with the high COD pulp is based on an equivalent formulation, in which the low COD pulp is displaced by an equal amount of regular fiber pulp. The formulation of the fiber cement composite materials in this example contained:
• about 8%o fiber pulp;
» about 35%o Portland cement; and
• about 57%o ground silica.
The preferred embodiments provide a technique for removing COD components/impurities from cellulose pulps in the manufacture of fiber cement grade pulps- Specifically, the preferred embodiments disclose the implementation of an additional extensive washing process in the pulp processing cycle, preferably after the digester, and during or after the brown stock washer system. One embodiment of this invention utilizes the existing equipment available in bleaching plants at most fiber cement pulp mills to carry out an extensive counter-current pulp washing at a normal or elevated temperature. Preferably, the multiple bleaching towers, which are typically a series of continuous plug flow reactors, are utilized to soak the pulps and diffuse COD and other impurities out from cellulose cell walls to the bulk solution. The washers in the bleaching plants subsequently remove the COD and other impurities by dewatering the pulp and transferring the unwanted
components to the wastewater. Advantageously, the technique of the preferred embodiments is capable of generating pulps with low COD contents and high purity while maintaining fiber strength, fiber lengths, and other key fiber properties that are important to manufactures of fiber reinforced cement composite materials. Furthermore, the technique is simple to implement and requires no addition of chemicals in some embodiments. The technique can reduce COD content of the pulp by about 20%o to 80%. Incorporation of the low COD fibers in the fiber cement composite material in accordance with the formulations and manufacture method of the present invention improves various physical and mechanical properties of the final product, and reduces the fresh water usage in the manufacturing process.
Although the foregoing description of the preferred embodiment of the present invention has shown, described and pointed out the fundamental novel features of the invention, it will be understood that various omissions, substitutions, and changes in the form of the detail of the apparatus as illustrated as well as the uses thereof, may be made by those skilled in the art, without departing from the spirit of the invention. Consequently, the scope of the invention should not be limited to the foregoing discussions, but should be defined by the appended claims.
Claims (7)
1. A method for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials, comprising: processing the fibers in an aqueous solution for a predetermined retention time, wherein the solution temperature is greater than about 65°C; and providing agitation to the solution so as to facilitate diffusion of impurities from the pores and lumens of the fibers.
2. The method of Claim 1, wherein processing the fibers in the aqueous solution comprises soaking and washing the fibers counter-currently.
3. The method Claim 1, wherein the solution temperature is between about 65°C and 120°C.
4. The method of Claim 1, wherein the retention time is between about 1 to 36 hours.
5. The method of Claim 2, wherein processing the fibers comprises soaking the fibers in a series of washing systems.
6. The method of Claim 5, wherein processing the fibers comprises soaking the fibers for about 30 minutes to 2 hours in each of the series of washing systems.
7. The method of Claim 5, wherein processing the fibers comprises soaking the fibers in up to six reactors.
8. The method of Claim 7, wherein the reactors are bleaching towers.
9. The method of Claim 5, wherein processing the fibers comprises soaking the fibers in a series of continuous plug flow bleaching reactors.
10. The method of Claim 5, wherein processing the fibers comprises soaking the fibers in a bleaching reactor followed by soaking the fibers in a bleached stock washer.
11. The method of Claim 1, wherein processing the fibers comprises processing the fibers in washing systems selected from the group consisting of washers, storage tanks, reactors, mixers, agitators, pumps, centrifuges, and filter presses.
12. The method of Claim 1, wherein processing the fibers comprises processing the fibers in washing systems selected from the group consisting of bleaching reactors, bleached stock washers, pulp transportation pumps, pulp dispersion/diffusion screw feeders, stock mixers and agitators, bleached stock storage towers, and bleached stock deckers.
13. The method of Claim 1, wherein the impurities comprise COD compounds.
14. The method of Claim 13, wherein processing the fibers comprises introducing at least one chemical to the solution, wherein the chemical reacts with the COD compounds and causes the compounds to become more soluble in the aqueous solution.
15. The method of Claim 14, wherein the chemicals are selected from the group consisting of chemicals comprising oxygen, ozone, and hydrogen peroxide, and mixtures thereof.
16. The method of Claim 1, wherein processing the fibers comprises maintaining the fibers at a pulp consistency of about 1%> to 35% in the aqueous solution.
17. The method of Claim 1, further comprising washing the fibers in a brown stock washer system prior to processing the fibers.
18. The method of Claim 17, wherein washing the fibers in a brown stock washer system comprises washing the fibers at a temperature greater than about 65°C.
19. The method of Claim 18, wherein washing the fibers in the brown stock washer system removes a large portion of the impurities from the fibers.
20. A pulping process, comprising: providing a delignified fiber substance; converting the delignified fiber substance into fiber pulps; washing the pulps at elevated temperatures greater than about 65°C in a manner so as to remove a large portion of COD components from the pulps; and processing the pulps in additional washing cycles so as to remove substantially all remaining COD impurities.
21. The pulping process of Claim 20, wherein processing the pulps in additional washing cycles comprises soaking the pulps in counter-current water at elevated temperatures greater than about 65°C for a predetermined retention time.
22. The pulping process of Claim 20, wherein providing a delignified fiber substance comprises delignifying a fiber substance selected from the group consisting of softwood, hardwood, agricultural raw materials, and lignocellulosic raw material.
23. The pulping process of Claim 20, wherein processing the pulps in additional washing cycles comprises adding a chemical that reacts with COD compounds in the pulps and causes these compounds to become more soluble in aqueous solutions.
24. A low COD cellulose fiber comprising a COD content of less than about 5kg/ton of oven dried pulp.
25. A composite building material incorporating reinforcing fibers, wherein at least a portion of the fibers have a COD content less than about 5 kg/ton.
26. The composite building material of Claim 25, further comprising a cementitious matrix.
27. The composite building material of Claim 26, wherein the cementitious matrix incorporating the individualized cellulose fibers is autoclaved.
28. The composite building material of Claim 25, wherein the reinforcing fibers are cellulose fibers made from cellulose pulps of lignocellulosic materials by a pulping process.
29. The composite building material of Claim 25, further comprising an aggregate.
30. The composite building material of Claim 29, wherein the aggregate is ground silica.
31. The composite building material of Claim 25, further comprising one or more density modifiers.
32. The composite building material of Claim 25, further comprising one or more additives.
33. A material formulation used to form a composite building material, comprising: a cementitious binder; an aggregate; one or more density modifiers; one or more additives; and cellulose fibers, wherein at least a portion of the fibers comprise low COD fibers, wherein the low COD fibers have a COD content of less than about 5 kg/ton of oven dried pulp.
34. The formulation of Claim 33, wherein the cementitious binder is selected from the group consisting of Portland cement, high alumina cement, lime, high phosphate cement, and ground granulated blast furnace slag cement, and mixtures thereof.
35. The formulation of Claim 33, wherein the aggregate is selected from the group consisting of ground silica, amorphous silica, micro silica, diatomaceous earth, coal combustion fly and bottom ashes, rice hull ash, blast furnace slag, granulated slag, steel slag, mineral oxides, mineral hydroxides, clays, magnasite or dolomite, metal oxides and hydroxides, and polymeric beads, and mixtures thereof
36. The formulation of Claim 33, wherein the density modifier is selected from the group consisting of plastic materials, expanded polystyrene, glass and ceramic materials, calcium silicate hydrates, microspheres and volcano ashes including perlite, pumice, shirasu basalt, and zeolites in expanded forms, and mixtures thereof.
37. The formulation of Claim 33, further comprising additional fibers selected from the group consisting of natural inorganic fibers, synthetic polymer fibers, regular cellulose fibers and mixtures thereof.
38- The formulation of Claim 33, wherein the low COD fibers are fibrillated to the freeness of about 150 to 750 degrees of Canadian Standard Freeness.
39. The formulation of Claim 33, wherein the low COD fibers comprise about 2%-20%o of the formulation by weight.
40. The formulation of Claim 33, comprising about 10%-80% cement by weight.
41. The formulation of Claim 33, comprising about 20%-80% silica by weight.
42. The formulation of Claim 33, comprising about 0%-50% lightweight density modifiers by weight.
43. The formulation of Claim 33, comprising about 0%>-10% additives by weight.
44. The formulation of Claim 33, wherein the low COD fibers improve the modulus of rupture of the fiber cement composite material by more than about 10%, compared to a fiber cement composite material made with an equivalent formulation containing fibers with COD content greater than about 5 kg/ton.
45. The formulation of Claim 33, wherein the low COD fibers improve the modulus of elasticity of the fiber cement composite material by more than about 10%), compared to a fiber cement composite material made with an equivalent formulation containing fibers with COD content greater than about 5 kg/ton. 46- The formulation of Claim 33, wherein the low COD fibers improve the ultimate strain of the fiber cement composite material by more than about 10%), compared to a fiber cement composite material made with an equivalent formulation containing fibers with COD content greater than about 5 kg/ton.
47. The formulation of Claim 33, wherein the low COD fibers reduce the amount of COD released to process water by more than about 10% in the manufacture of the fiber cement composite material, compared to a fiber cement composite material made with an equivalent formulation containing fibers with COD content greater than about 5 kg/ton.
48. The formulation of Claim 33, wherein the low COD fibers improve the toughness physical and mechanical properties of the fiber cement composite material, compared to a fiber cement composite material made with an equivalent formulation containing a fiber with COD content greater than about 5 kg/ton.
49. A method of manufacturing a fiber reinforced cement composite material using low COD fibers, comprising: preparing fibers to have a low impurity content; mixing the low impurity fiber with a cementitious binder and other ingredients to form a fiber cement mixture; forming the fiber cement mixture into a fiber cement article of a pre-selected shape and size; and curing the fiber cement article so as to form the fiber reinforced composite building material.
50. The method of Claim 49, wherein the fibers are individualized cellulose fibers.
51. The method of Claim 49, wherein preparing low impurity fibers comprises washing the fibers counter-currently above about 65°C in a solution.
52. The method of Claim 49, wherein preparing low impurity fibers further comprises adding a chemical to the washing solution, wherein the chemical reacts with COD components in the fiber and causes the COD components to be more soluble in aqueous solutions.
53. The method of Claim 49, wherein the fibers have a COD content of less than 5 kg/ton of oven dried pulp.
54. The method of Claim 49, further comprising dispersing the fibers at a preselected consistency and fibrillating the fibers to a pre-selected freeness range.
55. The method of Claim 49, further comprising dispersing the fibers comprises dispersing the fibers at a consistency of 1% to 6%.
56. The method of Claim 49, further comprising fibrillating the low COD fibers to the freeness of 150 to 750 degrees of Canadian Standard Freeness.
57. The method of Claim 56, wherein fibrillating the fibers comprises using equipment selected from the group consisting of hydra pulpers, refiners, hammer-mills, ball-mills, and deflakers.
58. The method of Claim 49, further comprising mixing the fibers with an aggregate, a density modifier and additives.
59. The method of Claim 49, wherein forming the fiber cement article comprises forming the article using a process selected from the group consisting of a Hatschek sheet process, a Mazza pipe process, a Magnani process, injection molding, extrusion, hand lay- up, molding, casting, filter pressing, Fourdrinier forming, multi-wire forming, gap blade forming, gap roll/blade forming, Bel-Roll forming, and combinations thereof.
60. The method of Claim 49, wherein forming the fiber cement article further comprises pressing, embossing the formed fiber cement article, and other post forming processes.
61. The method of Claim 49, wherein curing the fiber cement article comprises pre-curing and curing.
62. The method of Claim 61, wherein the fiber cement article is pre-cured for up to 80 hours at ambient temperature.
63. The method of Claim 61, wherein the fiber cement article is pre-cured for up to 24 hours at ambient temperature.
64. The method of Claim 61, wherein the fiber cement article is cured in an autoclave.
65. The method of Claim 64, wherein the fiber cement article is autoclaved at an elevated temperature and pressure at about 60 to 200°C for about 3 to 30 hours.
66. The method of Claim 64, wherein the fiber cement article is autodaved at an elevated temperature and pressure at about 60 to 200°C for about 24 hours or less.
7. The method of Claim 64, wherein curing the fiber cement article comprises g for up to 30 days.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113185185A (en) * | 2021-05-31 | 2021-07-30 | 扬州工业职业技术学院 | Multifunctional auxiliary agent for building material and preparation method thereof |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2001250832A1 (en) | 2000-03-14 | 2001-09-24 | James Hardie International Finance B.V. | Fiber cement building materials with low density additives |
CA2424377C (en) | 2000-10-04 | 2013-07-09 | Donald J. Merkley | Fiber cement composite materials using sized cellulose fibers |
AU2001295055B2 (en) * | 2000-10-04 | 2006-11-02 | James Hardie Technology Limited | Fiber cement composite materials using cellulose fibers loaded with inorganic and/or organic substances |
KR100865807B1 (en) | 2000-10-17 | 2008-10-28 | 제임스 하디 인터내셔널 파이낸스 비.브이. | Method and Apparatus for Reducing Impurities in Cellulose Fibers for Manufacture of Fiber Reinforced Cement Composite Materials |
US20050126430A1 (en) * | 2000-10-17 | 2005-06-16 | Lightner James E.Jr. | Building materials with bioresistant properties |
WO2002032830A2 (en) * | 2000-10-17 | 2002-04-25 | James Hardie Research Pty Limited | Fiber cement composite material using biocide treated durable cellulose fibers |
US20030164119A1 (en) * | 2002-03-04 | 2003-09-04 | Basil Naji | Additive for dewaterable slurry and slurry incorporating same |
CN1243615C (en) * | 2001-03-02 | 2006-03-01 | 詹姆士·哈代国际金融公司 | Spattering apparatus |
ES2284820T3 (en) * | 2001-03-09 | 2007-11-16 | James Hardie International Finance B.V. | FIBER REINFORCED CEMENT COMPOUND MATERIALS USING CHEMICALLY TREATED FIBERS WITH IMPROVED DISPERSABILITY. |
US7081184B2 (en) | 2002-05-15 | 2006-07-25 | Weyerhaeuser Company | Process for making a very low COD unbleached pulp |
AU2002309874B2 (en) * | 2002-05-15 | 2007-06-28 | Weyerhaeuser Company | Very low COD unbleached pulp |
WO2003097930A1 (en) | 2002-05-15 | 2003-11-27 | Weyerhaeuser Company | Process for producing very low cod unbleached pulp |
US20030213569A1 (en) * | 2002-05-15 | 2003-11-20 | Brian Wester | Very low COD unbleached pulp |
US20030213572A1 (en) * | 2002-05-15 | 2003-11-20 | Vrbanac Michael D. | Very low COD unbleached pulp |
US6811879B2 (en) | 2002-08-30 | 2004-11-02 | Weyerhaeuser Company | Flowable and meterable densified fiber flake |
US6837452B2 (en) | 2002-08-30 | 2005-01-04 | Weyerhaeuser Company | Flowable and meterable densified fiber flake |
US7993570B2 (en) | 2002-10-07 | 2011-08-09 | James Hardie Technology Limited | Durable medium-density fibre cement composite |
US20040081828A1 (en) * | 2002-10-25 | 2004-04-29 | Dezutter Ramon C. | Flowable and meterable densified fiber particle |
AU2004204092B2 (en) * | 2003-01-09 | 2010-02-25 | James Hardie Technology Limited | Fiber cement composite materials using bleached cellulose fibers |
SE0300276L (en) * | 2003-01-31 | 2003-12-09 | Kvaerner Pulping Tech | Method for bleaching cellulose pulp and bleaching line for this |
AU2004217523B2 (en) * | 2003-02-28 | 2010-09-23 | James Hardie Technology Limited | Fiber cement fence system |
WO2005021458A1 (en) * | 2003-08-29 | 2005-03-10 | Bki Holding Corporation | System for delivery of fibers into concrete |
FR2859743A1 (en) * | 2003-09-15 | 2005-03-18 | Saint Gobain Mat Constr Sas | PLASTIC CEMENTITIOUS PRODUCT AND METHOD OF MANUFACTURE |
US20070181201A1 (en) * | 2003-11-19 | 2007-08-09 | Rocla Pty Ltd | Cementitious pipes |
CA2555430A1 (en) * | 2004-03-10 | 2005-10-06 | Bki Holding Corporation | Cementitious material reinforced with purified cellulose fiber |
US7998571B2 (en) | 2004-07-09 | 2011-08-16 | James Hardie Technology Limited | Composite cement article incorporating a powder coating and methods of making same |
WO2007115379A1 (en) | 2006-04-12 | 2007-10-18 | James Hardie International Finance B.V. | A surface sealed reinforced building element |
CA2699903C (en) | 2007-10-02 | 2016-09-27 | James Hardie Technology Limited | Cementitious formulations and products |
US8209927B2 (en) | 2007-12-20 | 2012-07-03 | James Hardie Technology Limited | Structural fiber cement building materials |
JP5137889B2 (en) * | 2008-07-31 | 2013-02-06 | 太平洋セメント株式会社 | Gypsum board waste material processing method and cement manufacturing method |
KR101111664B1 (en) * | 2009-08-06 | 2012-02-14 | (주)케미우스코리아 | Concrete manufacturing method for improving impact resistance |
CN102094366B (en) * | 2010-11-25 | 2012-09-26 | 中国科学院过程工程研究所 | Clean pulping of rhus chinensis twigs and comprehensive utilization method thereof |
US9745224B2 (en) | 2011-10-07 | 2017-08-29 | Boral Ip Holdings (Australia) Pty Limited | Inorganic polymer/organic polymer composites and methods of making same |
US8864901B2 (en) | 2011-11-30 | 2014-10-21 | Boral Ip Holdings (Australia) Pty Limited | Calcium sulfoaluminate cement-containing inorganic polymer compositions and methods of making same |
JP5882748B2 (en) * | 2012-01-12 | 2016-03-09 | ケイミュー株式会社 | Evaluation method for hardened cement pulp |
WO2014049207A1 (en) | 2012-09-25 | 2014-04-03 | Greenbutton Oy | Robust material, method of producing the same as well as uses thereof |
US11370708B2 (en) * | 2019-10-22 | 2022-06-28 | James Hardie Technology Limited | Fiber cement material formulations and compositions thereof |
CA3175804A1 (en) * | 2020-04-21 | 2021-10-28 | Liangbing Hu | Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers |
CN113372050B (en) * | 2021-07-30 | 2022-04-26 | 浙江碧蓝云鼎控股有限公司 | High-strength calcium silicate board and preparation method thereof |
CN114837008A (en) * | 2022-05-13 | 2022-08-02 | 广东理文造纸有限公司 | Preparation process of paper pulp for packaging paper with recycled waste paper |
CN115182551B (en) * | 2022-07-13 | 2023-08-22 | 中建八局华南建设有限公司 | Vertical pipeline laying method |
Family Cites Families (191)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1571048A (en) | 1926-01-26 | Ments | ||
US1914163A (en) | 1929-06-24 | 1933-06-13 | Fidelity Trust Company | Art of sizing |
GB427626A (en) | 1933-09-23 | 1935-04-23 | Henry Dreyfus | Improvements in or relating to the manufacture of cellulose |
US2024689A (en) | 1934-02-16 | 1935-12-17 | Celanese Corp | Production of cellulose from ligno-cellulosic materials |
US2030383A (en) | 1934-10-18 | 1936-02-11 | Nekoosa Edwards Paper Co | Method of treating pulp |
GB442098A (en) | 1934-10-20 | 1936-02-03 | Adolfo Mazza | Improvements in or relating to the manufacture of pipes from asbestos-cement and thelike |
GB449384A (en) | 1934-10-29 | 1936-06-25 | Magnani Alessandro | Process for the direct manufacture of pipes and slabs of cement |
US2156308A (en) | 1935-01-26 | 1939-05-02 | Bakelite Building Prod Co Inc | Art of manufacturing cement-fibrous products |
US2175569A (en) | 1936-12-05 | 1939-10-10 | Kennedy Van Saun Mfg & Eng | Tube and the like mill |
US2175568A (en) | 1937-05-25 | 1939-10-10 | Haustein Karl Ewald | Manufacture of artificial building bodies |
US2176668A (en) | 1938-02-10 | 1939-10-17 | Int Silver Co | Silver plating process |
US2156311A (en) | 1938-04-09 | 1939-05-02 | Bakelite Building Prod Co Inc | Cement fiber product |
US2377484A (en) | 1940-09-25 | 1945-06-05 | Celotex Corp | Fiber plank |
DE747324C (en) | 1942-06-18 | 1945-01-24 | Eternit Werke Hatschek L | Process for the manufacture of cellulosic fiber cement products |
US2645576A (en) | 1948-03-10 | 1953-07-14 | Celanese Corp | Purifying wood pulp |
GB731597A (en) | 1950-10-04 | 1955-06-08 | Magnani Alessandro | Method of and apparatus for manufacturing endless fibro-cement sheets |
US2880101A (en) | 1956-05-28 | 1959-03-31 | Siporex Int Ab | Manufacture of steam-cured light-weight concrete |
FR1344947A (en) | 1962-09-03 | 1963-12-06 | Process for the treatment of cellulosic materials, and new products resulting therefrom, in particular concrete | |
US3264125A (en) | 1962-12-04 | 1966-08-02 | Versicrete Ind | Manufacture of lightweight concrete products |
DE1594933A1 (en) | 1967-03-17 | 1969-11-20 | Basf Ag | Process for refining fiber material containing or consisting of cellulose |
BE758763A (en) | 1969-11-12 | 1971-04-16 | Nat Res Dev | PERFECTED MIXING PROCESS |
GB1136661A (en) | 1970-02-13 | 1968-12-11 | W N Nicholson & Sons Ltd | Improvements in or relating to agricultural implements |
US3836412A (en) | 1970-04-16 | 1974-09-17 | Monsanto Co | Preparation of discontinuous fiber reinforced elastomer |
US3748160A (en) | 1970-06-09 | 1973-07-24 | M Carbajal | Process for making moldable bagasse compositions |
US3748100A (en) | 1971-04-26 | 1973-07-24 | Phillips Petroleum Co | Carbon black apparatus |
US3753749A (en) | 1971-08-12 | 1973-08-21 | Cement Marketing Co | Concrete compositions |
US4013480A (en) | 1971-09-13 | 1977-03-22 | The Dow Chemical Company | Cellulosic sizing agents |
SE361908B (en) | 1972-07-14 | 1973-11-19 | Kema Nord Ab | |
US3918981A (en) | 1972-08-14 | 1975-11-11 | United States Gypsum Co | Fungicidal dispersion, paper and process |
US3998944A (en) | 1972-08-14 | 1976-12-21 | United States Gypsum Company | Fungicidal paper |
US3843380A (en) | 1972-12-26 | 1974-10-22 | Scm Corp | Process for spray drying pigment |
GB1421556A (en) | 1973-03-13 | 1976-01-21 | Tac Construction Materials Ltd | Board products |
US4003752A (en) | 1974-05-22 | 1977-01-18 | Asahi Kasei Kogyo Kabushiki Kaisha | Magnesia cement composition, process of its manufacture, and composite comprising same |
GB1543157A (en) | 1975-05-17 | 1979-03-28 | Dow Corning Ltd | Treatment of fibres |
GB1537760A (en) | 1975-07-09 | 1979-01-04 | Sumitomo Chemical Co | Fluid plaster composition |
US4039170A (en) | 1975-09-08 | 1977-08-02 | Cornwell Charles E | System of continuous dustless mixing and aerating and a method combining materials |
US4766113A (en) | 1975-10-24 | 1988-08-23 | Chapman Chemical Company | Antimicrobial compositions and methods of using same |
GB1536663A (en) | 1975-10-28 | 1978-12-20 | Cape Boards & Panels Ltd | Fibre-reinforced articles |
SE406944B (en) * | 1976-04-14 | 1979-03-05 | Mo Och Domsjoe Ab | PROCEDURE FOR REGULATING THE ADDITION OF SUSPENSION LIQUID BY CONTINUOUS WASHING OF SUSPENSIONS |
GB1570983A (en) | 1976-06-26 | 1980-07-09 | Dow Corning Ltd | Process for treating fibres |
DK245177A (en) | 1977-06-02 | 1978-12-22 | K Holbek | COMPOSITE MATERIAL CONTAINING MODIFIED CELLULOSE FIBERS AS REINFORCEMENT MATERIAL |
US4225383A (en) | 1978-02-02 | 1980-09-30 | The Dow Chemical Company | Highly filled sheets and method of preparation thereof |
SE445120B (en) | 1978-05-23 | 1986-06-02 | Toyo Pulp Co Ltd | PROCEDURE FOR THE PREPARATION OF ALKALIC PASS |
JPS5551749A (en) * | 1978-10-05 | 1980-04-15 | Kimiyasu Kuwata | Wood fiber cement board manufacture |
US4258090A (en) | 1979-01-19 | 1981-03-24 | Institutul De Cergetari In Constructii Si Economia Constructilor Incerc | Method for the protection of concrete in sea water |
FI67072C (en) | 1979-02-09 | 1985-01-10 | Amiantus Ag | FOER FARING FOER FRAMSTAELLNING AV FIBERFOERSTAERKT HYDRAULISKT BINDANDE MATERIAL |
GB2041384A (en) | 1979-02-10 | 1980-09-10 | Pennington J | Improvements in and Relating to Board Products and Mouldings |
US4406703A (en) | 1980-02-04 | 1983-09-27 | Permawood International Corporation | Composite materials made from plant fibers bonded with portland cement and method of producing same |
US4510020A (en) | 1980-06-12 | 1985-04-09 | Pulp And Paper Research Institute Of Canada | Lumen-loaded paper pulp, its production and use |
AU515151B1 (en) | 1980-07-21 | 1981-03-19 | James Hardie Research Pty Limited | Fibre-reinforced cementitious articles |
DE3037220A1 (en) | 1980-10-02 | 1982-04-29 | Dynamit Nobel Ag, 5210 Troisdorf | STABLE AQUEOUS IMPREME SOLUTIONS MADE OF HYDROLLED ALKYLTRIAL COXISILANANE |
SE443383C (en) * | 1981-01-14 | 1987-07-14 | Mo Och Domsjoe Ab | PROCEDURE FOR WASHING CELLULOSAMASSA |
US4428775A (en) | 1981-02-11 | 1984-01-31 | National Gypsum Company | Reinforced cement sheet product containing no asbestos for fabricating on hatschek machine |
EP0058263A1 (en) | 1981-02-13 | 1982-08-25 | Mitsubishi Paper Mills, Ltd. | Manufacture of carbonless reproduction paper |
DE3106748A1 (en) | 1981-02-24 | 1982-09-09 | Dynamit Nobel Ag, 5210 Troisdorf | IMPREGNATING AGENT FOR CELLULOSE-CONTAINING MATERIAL |
DE3110864C2 (en) | 1981-03-20 | 1984-10-04 | Alfons K. 7513 Stutensee Herr | Process for the production of an asbestos-free building material |
US4351867A (en) | 1981-03-26 | 1982-09-28 | General Electric Co. | Thermal insulation composite of cellular cementitious material |
US4548676A (en) | 1981-05-13 | 1985-10-22 | United States Gypsum Company | Paper having calcium sulfate mineral filler for use in the production of gypsum wallboard |
US4497688A (en) | 1981-05-20 | 1985-02-05 | Schaefer Ernest R | Oil scavenging material |
FI822075L (en) | 1981-06-19 | 1982-12-20 | Cape Universal Claddings | BYGGNADSSKIVOR |
US4738723A (en) | 1981-12-24 | 1988-04-19 | Gulf States Asphalt Co. | Asbestos-free asphalt composition |
US4457785A (en) | 1982-09-24 | 1984-07-03 | Ppg Industries, Inc. | Treated glass fibers and nonwoven sheet-like mat and method |
JPS59131551A (en) | 1983-01-16 | 1984-07-28 | 松下電工株式会社 | Manufacture of inorganic hardened body |
GB8305045D0 (en) | 1983-02-23 | 1983-03-30 | Courtaulds Plc | Stabilising fibres/particles of organic polymers |
DE3308917C2 (en) | 1983-03-12 | 1986-12-11 | G. Siempelkamp Gmbh & Co, 4150 Krefeld | Method and arrangement for the production of hydraulically bound pressed material plates |
DK232583D0 (en) | 1983-05-24 | 1983-05-24 | Holbek Kjeld Aps | IMPREGNATED CELLULOSE FIBERS |
JPS60118658A (en) * | 1983-11-30 | 1985-06-26 | 松下電工株式会社 | Manufacture of excelsior cement board |
US4647589A (en) | 1984-05-25 | 1987-03-03 | Texaco Inc. | Inhibition of microbiological growth |
US4643920A (en) | 1984-10-03 | 1987-02-17 | Morton Thiokol Inc. | Method for incorporating antimicrobials into fibers |
JPS61111983A (en) | 1984-11-02 | 1986-05-30 | ミサワホ−ム株式会社 | Manufacture of foamed concrete |
US4806203A (en) | 1985-02-14 | 1989-02-21 | Elton Edward F | Method for alkaline delignification of lignocellulosic fibrous material at a consistency which is raised during reaction |
JPS61197454A (en) | 1985-02-25 | 1986-09-01 | 三菱レイヨン株式会社 | Manufacture of lightweight calcium silicate product |
FR2611432B1 (en) | 1985-03-21 | 1992-01-03 | Lowe Henry | NON-CLAY MATERIAL FOR TRIMMING CAT BOXES AND PROCESS FOR PREPARING THE SAME |
DE3512194A1 (en) * | 1985-04-03 | 1986-10-09 | Hoechst Ag, 6230 Frankfurt | A NEW ANSAMYCIN ANTIBIOTIC, A MICROBIAL PROCESS FOR PRODUCING IT AND ITS USE AS A MEDICINAL PRODUCT |
US5021093A (en) | 1985-05-29 | 1991-06-04 | Beshay Alphons D | Cement/gypsum composites based cellulose-I |
US4647509A (en) | 1985-10-07 | 1987-03-03 | The Dow Chemical Company | Thermoformable multilayer barrier structures |
DE3601736A1 (en) | 1986-01-22 | 1987-07-23 | Fulgurit Baustoffe Gmbh | Process for producing construction panels |
AT391131B (en) | 1986-11-04 | 1990-08-27 | Eternit Werke Hatschek L | Mixture for producing shaped bodies and also their use and shaped bodies produced therefrom |
DK572986D0 (en) | 1986-11-28 | 1986-11-28 | Eternit Fab Dansk As | PROCEDURE FOR THE MANUFACTURING OF FIBER Reinforced Molds |
EP0270075B1 (en) | 1986-12-04 | 1993-04-07 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Durable and highly stable moulded construction parts |
US4938958A (en) | 1986-12-05 | 1990-07-03 | Shinagawa Fuel Co., Ltd. | Antibiotic zeolite |
FI77063B (en) * | 1986-12-17 | 1988-09-30 | Ahlstroem Oy | FOERFARANDE FOER EFFEKTIVERING AV FIBERSUSPENSIONSTVAETT. |
US5429717A (en) * | 1986-12-22 | 1995-07-04 | Aga Aktiebolag | Method of washing of alkaline pulp by adding carbon dioxide to the pulp |
US4944842A (en) | 1987-03-26 | 1990-07-31 | Kamyr, Inc. | Method for reducing contamination in pulp processing |
CH672483A5 (en) | 1987-04-21 | 1989-11-30 | Ametex Ag | |
US4985119A (en) | 1987-07-01 | 1991-01-15 | The Procter & Gamble Cellulose Company | Cellulose fiber-reinforced structure |
NZ221573A (en) | 1987-08-26 | 1991-02-26 | New Zealand Forest Prod | Fibre reinforced cement composites and their preparation |
CN1032332A (en) | 1987-10-07 | 1989-04-12 | 重庆江南纤维素化工厂 | Cement setting retarder and manufacture method |
AT391133B (en) | 1988-02-18 | 1990-08-27 | Eternit Werke Hatschek L | METHOD FOR TREATING CELLULOSE FIBERS AND FIBER CEMENT PRODUCTS AND MIXTURES FOR THE PRODUCTION THEREOF |
PL154782B1 (en) | 1988-04-18 | 1991-09-30 | Ts Osrodek Badawczo Rozwo | Roof plates production method |
DE3813341A1 (en) | 1988-04-21 | 1989-11-02 | Eirich Maschf Gustav | METHOD FOR HUMIDIFYING A CEMENT OR PLASTERED FIBER-CONTAINING MATERIAL MIXTURE |
JPH07115902B2 (en) | 1988-05-06 | 1995-12-13 | 信越化学工業株式会社 | Cement composition for extrusion molding |
US5102596A (en) | 1989-12-01 | 1992-04-07 | G. Siempelkamp Gmbh & Co. | Method of producing shaped articles of fiber/binder mixtures |
US5118225A (en) | 1990-01-25 | 1992-06-02 | Nycon, Inc. | Fiber-loading apparatus and method of use |
US5223090A (en) | 1991-03-06 | 1993-06-29 | The United States Of America As Represented By The Secretary Of Agriculture | Method for fiber loading a chemical compound |
TW207987B (en) | 1991-03-20 | 1993-06-21 | Hoechst Ag | |
US5236994A (en) | 1991-03-28 | 1993-08-17 | Miles Inc. | Process for sealing and/or priming concrete with aqueous polyisocyanate dispersions and the concrete obtained by this process |
US5063260A (en) | 1991-05-01 | 1991-11-05 | Dow Corning Corporation | Compositions and their use for treating fibers |
JP2508554Y2 (en) | 1991-06-04 | 1996-08-28 | 三菱重工業株式会社 | Bearing lubrication device for rotating machinery |
US5191456A (en) | 1991-07-30 | 1993-03-02 | Alcatel Network Systems, Inc. | Efficient feeder fiber loading from distribution fibers |
US5346541A (en) | 1992-11-18 | 1994-09-13 | Net/Tech International, Inc. | Water dispersible formulations and materials and methods for influencing their water dispersibility |
DE4127932A1 (en) | 1991-08-23 | 1993-02-25 | Bold Joerg | Fibre-reinforced plasterboard mfr. - using by=product gypsum and waste paper |
US5482550A (en) | 1991-12-27 | 1996-01-09 | Strait; Mark C. | Structural building unit and method of making the same |
US5876561A (en) | 1992-02-28 | 1999-03-02 | International Paper Company | Post digestion treatment of cellulosic pulp to minimize formation of dioxin |
US5465547A (en) | 1992-04-30 | 1995-11-14 | Jakel; Karl W. | Lightweight cementitious roofing |
SE469387B (en) | 1992-05-11 | 1993-06-28 | Kamyr Ab | SEATING WHITE PILLOW WITHOUT USING CHLORIC CHEMICALS |
BE1005891A3 (en) | 1992-06-03 | 1994-03-01 | Herstal | Device for braking runner of a firearm. |
TW312654B (en) | 1993-02-17 | 1997-08-11 | Khashoggi E Ind | |
DE4316666C1 (en) | 1993-05-13 | 1994-12-08 | Maerkische Faser Ag | Hydrophilicising agent |
ATE282366T1 (en) * | 1993-06-10 | 2004-12-15 | Karlin Technology Inc | VERTEBRATE DISTRACTOR |
US5405498A (en) | 1993-06-22 | 1995-04-11 | Betz Paperchem, Inc. | Method for improving pulp washing efficiency |
FI933129A0 (en) | 1993-07-08 | 1993-07-08 | Nokia Mobile Phones Ltd | DATAOEVERFOERINGSFOERFARANDE FOER ETT DIGITALT CELLULAERT MOBILTELEFONSYSTEM OCH ETT DIGITALT CELLULAERT MOBILTELEFONSYSTEM |
US5403392A (en) | 1993-08-04 | 1995-04-04 | Ennis Herder, Inc. | High solids aqueous dispersions of hydrophobizing agents |
DE4334422C2 (en) | 1993-10-08 | 1996-07-11 | Fraunhofer Ges Forschung | Lye from chemical-thermal digestion of chipboard and fiberboard that has already been processed, binder, processes for their production and their use as extenders for wood-based binders |
US5421867A (en) | 1993-10-18 | 1995-06-06 | Cucorp, Inc. | Composition and process of combining a grout or mortar mix with copper-8-quinolinolate to form an antimicrobial composition |
WO1995021050A1 (en) | 1994-02-01 | 1995-08-10 | Northwestern University | Extruded fiber-reinforced cement matrix composites |
US5472486A (en) | 1994-09-02 | 1995-12-05 | Sequa Chemicals, Inc. | Modified opacifying composition for paper |
CA2163389A1 (en) * | 1994-11-23 | 1996-05-24 | Malcolm Cronlund | Chlorine-free organosolv pulps |
FI945783A (en) * | 1994-12-08 | 1996-06-09 | Ahlstroem Oy | Procedure for streamlining washing |
JP3279872B2 (en) | 1995-05-29 | 2002-04-30 | ニチハ株式会社 | Wood cement board and method for producing the same |
CH689594A5 (en) | 1995-08-16 | 1999-06-30 | Nueva Ag | A process for the production of moldings from fiber-reinforced hydraulically setting material. |
AUPN504095A0 (en) * | 1995-08-25 | 1995-09-21 | James Hardie Research Pty Limited | Cement formulation |
US5643359A (en) | 1995-11-15 | 1997-07-01 | Dpd, Inc. | Dispersion of plant pulp in concrete and use thereof |
GB2307425A (en) | 1995-11-23 | 1997-05-28 | Nationwide Filter Comp Ltd | Filter assembly with biocide |
US5866057A (en) | 1996-01-31 | 1999-02-02 | Casco Nobel Ab | Process for the manufacture of particle-board and fiberboard |
WO1997031153A1 (en) | 1996-02-23 | 1997-08-28 | Quaker Chemical Corporation | Manufacture of softened cellulose fiber-based products |
JP3265183B2 (en) | 1996-02-28 | 2002-03-11 | ニチハ株式会社 | Manufacturing method of inorganic plate |
AU725266B2 (en) | 1996-03-19 | 2000-10-12 | A J Bates Limited | Coatings |
PL184356B1 (en) | 1996-04-12 | 2002-10-31 | Marlit Ltd | Method of obtaining composite lignocellulose materials |
CA2205099A1 (en) | 1996-05-24 | 1997-11-24 | Patricia Marie Lesko | Fluorescent polymers and coating compositions |
US6325853B1 (en) | 1996-07-19 | 2001-12-04 | Nordson Corporation | Apparatus for applying a liquid coating with an improved spray nozzle |
SE513941C2 (en) | 1996-12-16 | 2000-11-27 | John Fellert | Sound absorbing plaster mills mainly comprising cotton fibers and expanded mineral |
HU224122B1 (en) | 1996-12-23 | 2005-05-30 | Protekum Umweltinstitut Gmbh. Oranienburg | Non-inflammable fiber product |
DE19654836A1 (en) | 1996-12-23 | 1998-06-25 | Protekum Umweltinstitut Gmbh O | Non-combustible heat insulating fibre product |
US5786282A (en) | 1997-02-25 | 1998-07-28 | Barnhardt Manufacturing Company | Opened wet processed intermediate natural fiber product suitable for formation into end use fiber products with long-lasting antimicrobial properties and method |
AUPO612097A0 (en) | 1997-04-10 | 1997-05-08 | James Hardie Research Pty Limited | Building products |
US5812881A (en) | 1997-04-10 | 1998-09-22 | International Business Machines Corporation | Handshake minimizing serial to parallel bus interface in a data processing system |
US5777024A (en) | 1997-04-30 | 1998-07-07 | The Valspar Corporation | Urethane resins and coating compositions and methods for their use |
US6045057A (en) | 1997-05-29 | 2000-04-04 | Moor; Ronald C. | Method and apparatus for spray applying fiber-reinforced resins with high ceramic fiber loading |
EP2210865A1 (en) | 1997-06-25 | 2010-07-28 | W.R. Grace & Co.-Conn. | Admixture and methods for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-containing aggregates |
US6074522A (en) | 1997-08-01 | 2000-06-13 | Seymour; George W. | Process to optimize pulp washing variables |
AR015457A1 (en) | 1997-10-15 | 2001-05-02 | Redco Nv | POLYPROPYLENE FIBERS FOR THE REINFORCEMENT OF FIBROCEMENT PRODUCTS, PROCESS FOR THE SURFACE TREATMENT OF POLYPROPYLENE FIBERS, AND PRODUCT FORMED IN FIBROCEMENT |
US6138430A (en) | 1997-11-17 | 2000-10-31 | Cemplank, Inc. | Cementitious building panel with cut bead |
FR2771406B1 (en) | 1997-11-27 | 2000-02-11 | Bouygues Sa | METAL FIBER CONCRETE, CEMENT MATRIX AND PREMIXES FOR THE PREPARATION OF THE MATRIX AND CONCRETE |
US5993537A (en) | 1998-03-11 | 1999-11-30 | Dalhousie University | Fiber reinforced building materials |
US6228215B1 (en) | 1998-04-06 | 2001-05-08 | Hoffman Enviornmental Systems, Inc. | Method for countercurrent treatment of slurries |
US6176920B1 (en) | 1998-06-12 | 2001-01-23 | Smartboard Building Products Inc. | Cementitious structural panel and method of its manufacture |
JP4043107B2 (en) * | 1998-07-30 | 2008-02-06 | ニチハ株式会社 | High specific gravity wood cement board, multi-layer high specific gravity wood cement board and manufacturing method thereof |
FI104988B (en) | 1998-12-04 | 2000-05-15 | Valmet Corp | Method and plant for regulating the beginning of the drying portion of a paper machine |
US6562743B1 (en) | 1998-12-24 | 2003-05-13 | Bki Holding Corporation | Absorbent structures of chemically treated cellulose fibers |
CN1099391C (en) | 1999-01-19 | 2003-01-22 | 邹菁 | Hot-pressing production process of composite plant fiber-cement board |
US6245196B1 (en) | 1999-02-02 | 2001-06-12 | Praxair Technology, Inc. | Method and apparatus for pulp yield enhancement |
JP3705333B2 (en) | 1999-05-12 | 2005-10-12 | 信越化学工業株式会社 | Method for producing organosilicon compound having silanol group |
WO2000071336A1 (en) | 1999-05-20 | 2000-11-30 | The Penn State Research Foundation | Process for enhancing the characteristics and durability of wood fiber cement and wood fiber concrete composites |
FI113187B (en) * | 1999-05-28 | 2007-09-25 | Metso Paper Pori Oy | Procedure for treating pulp |
US6613424B1 (en) | 1999-10-01 | 2003-09-02 | Awi Licensing Company | Composite structure with foamed cementitious layer |
US6475275B1 (en) | 1999-10-21 | 2002-11-05 | Isolatek International | Cement composition |
CN1382074A (en) | 1999-10-28 | 2002-11-27 | 温莎技术有限公司 | Method of applying powder coating to non-metallic substrate |
SE515612E (en) | 1999-12-09 | 2009-02-26 | Proflute Ab | Bacteriostatic moisture exchange element and process for its preparation |
JP4324931B2 (en) | 2000-02-25 | 2009-09-02 | 神島化学工業株式会社 | Calcium silicate molded body and method for producing the same |
AU2001250832A1 (en) | 2000-03-14 | 2001-09-24 | James Hardie International Finance B.V. | Fiber cement building materials with low density additives |
US20020007926A1 (en) | 2000-04-24 | 2002-01-24 | Jewell Richard A. | Method for producing cellulose fiber having improved biostability and the resulting products |
JP4528414B2 (en) | 2000-04-28 | 2010-08-18 | 株式会社エーアンドエーマテリアル | Fiber-reinforced calcium silicate molded body and method for producing the same |
AU2001265229A1 (en) | 2000-05-31 | 2001-12-11 | Board Of Control Of Michigan Technological University | Compositions and methods for wood preservation |
PT1309755E (en) | 2000-08-07 | 2012-05-25 | Akzo Nobel Nv | Process for sizing paper |
US6419788B1 (en) * | 2000-08-16 | 2002-07-16 | Purevision Technology, Inc. | Method of treating lignocellulosic biomass to produce cellulose |
AU2001285038A1 (en) | 2000-08-25 | 2002-03-13 | Cp Kelco U.S., Inc. | Hydrophilic insoluble cellulose as rheological modifier in water-immiscible liquids |
WO2002026749A1 (en) | 2000-09-27 | 2002-04-04 | Chisso Corporation | Aqueous solution of aminated silanol compound, use thereof, and process for producing the same |
AU2001295055B2 (en) | 2000-10-04 | 2006-11-02 | James Hardie Technology Limited | Fiber cement composite materials using cellulose fibers loaded with inorganic and/or organic substances |
CA2424377C (en) | 2000-10-04 | 2013-07-09 | Donald J. Merkley | Fiber cement composite materials using sized cellulose fibers |
WO2002032830A2 (en) | 2000-10-17 | 2002-04-25 | James Hardie Research Pty Limited | Fiber cement composite material using biocide treated durable cellulose fibers |
US20050126430A1 (en) | 2000-10-17 | 2005-06-16 | Lightner James E.Jr. | Building materials with bioresistant properties |
KR100865807B1 (en) | 2000-10-17 | 2008-10-28 | 제임스 하디 인터내셔널 파이낸스 비.브이. | Method and Apparatus for Reducing Impurities in Cellulose Fibers for Manufacture of Fiber Reinforced Cement Composite Materials |
US6488762B1 (en) | 2000-10-30 | 2002-12-03 | Advanced Materials Technologies, Llc | Composition of materials for use in cellular lightweight concrete and methods thereof |
BR0115137A (en) | 2000-11-06 | 2003-09-16 | Paper Science & Tech Inst Inc | Compound and method of reinforcement of mineral base material |
CN1243615C (en) | 2001-03-02 | 2006-03-01 | 詹姆士·哈代国际金融公司 | Spattering apparatus |
US20030164119A1 (en) | 2002-03-04 | 2003-09-04 | Basil Naji | Additive for dewaterable slurry and slurry incorporating same |
ES2284820T3 (en) | 2001-03-09 | 2007-11-16 | James Hardie International Finance B.V. | FIBER REINFORCED CEMENT COMPOUND MATERIALS USING CHEMICALLY TREATED FIBERS WITH IMPROVED DISPERSABILITY. |
DE10113884B4 (en) | 2001-03-21 | 2005-06-02 | Basf Coatings Ag | Process for coating microporous surfaces and use of the process |
CN1505597A (en) | 2001-04-09 | 2004-06-16 | ղķ˹�������о�����˾ | Integral water resistant fibre-cement |
EP1346964A3 (en) | 2002-03-21 | 2006-01-04 | Owens Corning | Wet-formed mat applications for cement backerboards |
WO2003097930A1 (en) | 2002-05-15 | 2003-11-27 | Weyerhaeuser Company | Process for producing very low cod unbleached pulp |
US7081184B2 (en) | 2002-05-15 | 2006-07-25 | Weyerhaeuser Company | Process for making a very low COD unbleached pulp |
JP4107478B2 (en) | 2002-05-22 | 2008-06-25 | 株式会社エーアンドエーマテリアル | Inorganic papermaking board using reinforcing pulp and method for producing the same |
US6884741B2 (en) | 2002-07-23 | 2005-04-26 | H.B. Fuller Licensing & Financing, Inc. | Antimicrobial sheeting article |
US6942726B2 (en) | 2002-08-23 | 2005-09-13 | Bki Holding Corporation | Cementitious material reinforced with chemically treated cellulose fiber |
US6837452B2 (en) | 2002-08-30 | 2005-01-04 | Weyerhaeuser Company | Flowable and meterable densified fiber flake |
US6811879B2 (en) | 2002-08-30 | 2004-11-02 | Weyerhaeuser Company | Flowable and meterable densified fiber flake |
US7028436B2 (en) | 2002-11-05 | 2006-04-18 | Certainteed Corporation | Cementitious exterior sheathing product with rigid support member |
AU2004204092B2 (en) | 2003-01-09 | 2010-02-25 | James Hardie Technology Limited | Fiber cement composite materials using bleached cellulose fibers |
CN1224701C (en) | 2003-03-17 | 2005-10-26 | 四川大学 | High-effective aciduric liquifying saccharifyig enzyme, its preparation method and application |
-
2001
- 2001-09-25 KR KR1020037005339A patent/KR100865807B1/en active IP Right Grant
- 2001-09-25 AU AU2001296904A patent/AU2001296904B2/en not_active Ceased
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- 2001-09-25 CZ CZ20031253A patent/CZ20031253A3/en unknown
- 2001-09-25 EP EP01977815A patent/EP1330571B1/en not_active Revoked
- 2001-09-25 AU AU9690401A patent/AU9690401A/en active Pending
- 2001-09-25 BR BR0114671A patent/BR0114671A/en not_active Application Discontinuation
- 2001-09-25 CA CA 2424699 patent/CA2424699C/en not_active Expired - Lifetime
- 2001-09-25 CN CNB018174779A patent/CN100535239C/en not_active Expired - Fee Related
- 2001-09-25 AT AT01977815T patent/ATE323664T1/en not_active IP Right Cessation
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- 2001-09-25 WO PCT/US2001/042294 patent/WO2002033164A2/en active IP Right Grant
- 2001-09-25 PL PL01362738A patent/PL362738A1/en unknown
- 2001-09-25 NZ NZ52539301A patent/NZ525393A/en not_active IP Right Cessation
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- 2001-09-28 AR ARP010104607 patent/AR034163A1/en unknown
- 2001-10-02 MY MYPI20014600 patent/MY128448A/en unknown
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-
2012
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113185185A (en) * | 2021-05-31 | 2021-07-30 | 扬州工业职业技术学院 | Multifunctional auxiliary agent for building material and preparation method thereof |
CN113185185B (en) * | 2021-05-31 | 2022-08-02 | 扬州工业职业技术学院 | Multifunctional auxiliary agent for building material and preparation method thereof |
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