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Fabric Creped Absorbent Sheet With Variable Local Basis Weight - Patent 8152957
This application relates generally to an absorbent sheet for paper towel and tissue. Typical products have a variable local basis weight with (i) elongated densified regions oriented along the machine direction of the product having arelatively low basis weight and (ii) fiber-enriched regions of a relatively high basis weight between the densified regions.BACKGROUND Methods of making paper tissue, towel, and the like, are well known, including various features such as Yankee drying, through-air drying (TAD), fabric creping, dry creping, wet creping, and so forth. Conventional wet pressing (CWP) processeshave certain advantages over conventional through-air drying (TAD) processes including: (1) lower energy costs associated with the mechanical removal of water rather than transpiration drying with hot air; and (2) higher production speeds that are morereadily achieved with processes that utilize wet pressing to form a web. On the other hand, through-air drying processes have become the method of choice for new capital investment, particularly for the production of soft, bulky, premium quality towelproducts. Fabric creping has been employed in connection with papermaking processes which include mechanical or compactive dewatering of the paper web as a means to influence product properties. See U.S. Pat. Nos. 4,689,119 and 4,551,199 of Weldon;4,849,054 of Klowak; and 6,287,426 of Edwards et al. Operation of fabric creping processes has been hampered by the difficulty of effectively transferring a web of high or intermediate consistency to a dryer. Further U.S. patents relating to fabriccreping include the following: U.S. Pat. No. 4,834,838; U.S. Pat. No. 4,482,429 as well as U.S. Pat. No. 4,445,638. Note also, U.S. Pat. No. 6,350,349 to Hermans et al., which discloses wet transfer of a web from a rotating transfer surface to afabric. In connection with papermaking processes, fabric molding has also been employed as a means to provide texture and bulk
Fabric Crepe/draw Process For Producing Absorbent Sheet - Patent 8152958
BACKGROUND Methods of making paper tissue, towel, and the like are well known, including various features such as Yankee drying, throughdrying, fabric creping, dry creping, wet creping and so forth. Conventional wet pressing processes have certainadvantages over conventional through-air drying (TAD) processes including: (1) lower energy costs associated with the mechanical removal of water rather than transpiration drying with hot air, and (2) higher production speeds which are more readilyachieved with processes that utilize wet pressing to form a web. On the other hand, through-air drying processing has been widely adopted for new capital investment, particularly for the production of soft, bulky, premium quality tissue and towelproducts. Fabric creping has been employed in connection with papermaking processes that include mechanical or compactive dewatering of the paper web as a means to influence product properties. See U.S. Pat. Nos. 4,689,119 and 4,551,199 to Weldon;U.S. Pat. Nos. 4,849,054 and 4,834,838 to Klowak; and U.S. Pat. No. 6,287,426 to Edwards et al. Operation of fabric creping processes has been hampered by the difficulty of effectively transferring a web of high or intermediate consistency to adryer. Note also U.S. Pat. No. 6,350,349 to Hermans et al. which discloses wet transfer of a web from a rotating transfer surface to a fabric. Further United States patents relating to fabric creping more generally include the following: U.S. Pat. Nos. 4,834,838; 4,482,429 and 4,445,638, as well as U.S. Pat. No. 4,440,597 to Wells et al. In connection with papermaking processes, fabric molding has also been employed as a means to provide texture and bulk. In this respect, there is seen in U.S. Pat. No. 6,610,173 to Lindsay et al. a method of imprinting a paper web during awet pressing event which results in asymmetrical protrusions corresponding to the deflection conduits of a deflection member. The '173 patent reports that a different
Method For Manufacturing A Regenerated Particle Aggregate - Patent 8152963
The present invention relates to a regenerated particle aggregate that has been regenerated through a dehydration process, a drying process, a calcined process, and a pulverization process, using deinked froth as main raw materials, a method formanufacturing the regenerated particle aggregate, a regenerated particle aggregate-containing paper containing the regenerated particle aggregate therein, and a coated paper for printing having the regenerated particle aggregate coated thereon.BACKGROUND ART In recent years, regeneration of used papers attracts more attention in the perspective of environmental protection, resource conservation, and garbage reduction. Today, used papers of newspapers, magazine papers, corrugated papers, etc. aremainly used as sources of used papers for raw materials of these regenerated papers. Recently, an activity for collection of waste office papers out of offices by the whole building is also found, thus the regeneration of the used papers is becomingmore important technology. Manufacturing recycled papers generates a large amount of paper sludge, such as deinked froth discharged from used paper treatment processes, wastewater and dehydration sludge discharged from respective paper manufacturing processes etc. The paper sludge contains many inorganic substances, such as fillers applied to various papers, and pigments for coated layers of papers. Conventionally, this paper sludge is burnt for volume-reduction, or landfill disposal. However, since the paper sludge contains a large amount of inorganic substances, burning of the paper sludge leaves a large amount of ash (inorganicsubstance), leading to a low effect in volume reduction. For this reason, the use of ash is intended as raw material of cement, soil conditioner and so on. However, in such use, a large amount of ash cannot be used, because the ash is merely served asan auxiliary agent. After all, most of ash is to be used for landfill disposal. There can be a method for effe
Doctor Apparatus And A Method For A Web Forming Machine For Doctoring A Moving Surface As Well As A Blade Holder - Patent 8152966
CROSS REFERENCES TO RELATED APPLICATIONS This application is a U.S. national stage application of International App. No. PCT/FI2008/050548, filed Oct. 3, 2008, the disclosure of which is incorporated by reference herein, and claims priority on Finnish App. No. 20075718, filed Oct. 10, 2007.STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT Not applicable.BACKGROUND OF THE INVENTION The invention relates to a doctor apparatus for a web forming machine for doctoring a moving surface with the doctor apparatus including a blade, a blade holder to which the blade is adapted, a frame component to which the blade holder isadapted, and a loading element is arranged between the frame component and the blade holder for loading the blade holder and further the blade. The invention also relates to a blade holder and a method for a web forming machine for doctoring a moving surface. At present, an apparatus for doctoring a moving surface is known, for example, from publication U.S. Pat. No. 6,942,734. The apparatus includes a frame component to which a blade holder is connected. The blade holder, in turn, has a bladeconnected thereto. The blade holder is loaded with a loading hose and for the loading hose, on the other hand, a counter force is provided with an opening hose. In other words, the opening hose providing the counter force for the loading hose is usedto open the gap between the blade and a roll surface. There are known several corresponding apparatuses in which the gap between a blade and a roll surface is opened by means of an opening hose and closed by means of a loading hose. However, a commonproblem with the use of these is that the design of the opening hose is restricted, which means that the opening of the gap between the blade and the roll surface is also restricted. An opening hose and a loading hose also substantially complicate theremoval of the blade holder from the frame component. Publication WO 01/255
Hydrofoil For A Papermaking Installation - Patent 8152969
This application claims the priority, under 35 U.S.C. .sctn.119, of Austrian patent application A 1710/2006, filed Oct. 16, 2006; the prior application is herewith incorporated by reference in its entirety.BACKGROUND OF THE INVENTIONField of the Invention The present invention relates to a hydrofoil, also referred to as a wire scraper or wiper strip, for paper production installations. The hydrofoil is configured on its side which faces the wire with a wear strip formed of plates that arearranged next to one another and are made from a ceramic material. Papermaking or paper production installations are configured with at least one wire which can be moved along the installation, a paper stock or pulp being applied to the wire at the beginning of the installation. The fluid, in particular water,which is contained in the paper stock is discharged over a first region of the movement of the wire. The paper material which is situated on the wire is dried over further regions of the movement of the latter, said paper material subsequently beingraised from the wire and being processed further. Here, the wire is guided over hydrofoils. or scrapers, which serve firstly to support the wire and serve secondly to strip off the fluid which emerges from the paper stock from the underside of the wireor to exert a suction action on the paper stock. Hydrofoils of this type are arranged exchangeably in the installation which is fixed to the frame, in order for it to be possible for them to be replaced at any time by a new hydrofoil. Prior art wires are manufactured from a wire mesh made from a plastic material. On account of the hardness of this material, furthermore on account of the speed of approximately 30 m/s, at which the wire is moved over the hydrofoil, and finallyon account of the aggressiveness of the fluids which emerge from the paper stock, the hydrofoils which support the wire are subjected to very high wear, for which reason they have to be configured with a we
Embossed Multi-ply Fibrous Structure Product - Patent 8152959
The present invention relates to multi-ply fibrous structure products, more specifically embossed multi-ply fibrous structure products having enhanced quilted appearance.BACKGROUND OF THE INVENTION Cellulosic fibrous structures are a staple of everyday life. Cellulosic fibrous structures are used as consumer products for paper towels, toilet tissue, facial tissue, napkins, and the like. The large demand for such paper products hascreated a demand for improved versions of the products and the methods of their manufacture. Some consumers prefer embossed cellulosic fibrous structure products that have a softer, more three-dimensional, quilted appearance. Consumers also desire products having the appearance of relatively high caliper with aesthetically pleasingdecorative patterns exhibiting a high quality cloth-like appearance. Such attributes, however, must be provided without sacrificing the other desired functional qualities of the product such as softness, absorbency, drape (flexibility/limpness) and bondstrength between the plies. Multiple ply cellulosic fibrous structures are known in the art of consumer products. Such products are cellulosic fibrous structures having more than one, typically two, plies superimposed in face-to-face relationship to form a laminate. Itis known in the art to emboss sheets comprising multiple plies of tissue for aesthetic purposes and to maintain the plies in face-to-face relation during use. In addition, embossing can increase the surface area of the plies thereby enhancing their bulkand water holding capacity. The prior art teaches that embossing improves appearance and generally improves (i.e., increases) the functional attributes of absorbency, compressibility, and bulk of the paper product. The prior art also teaches using various papermakingbelts that can produce strong, soft, and absorbent paper products with textured surfaces. The combination of a textured surface made during the papermaking process with embossments
Method For Producing Paper With A High Substance Weight - Patent 8152962
The present invention relates to a process for producingpaper of high basis weight, especially board and cardboard, by draining a paper pulp on a wire in the presence of a combination of at least one amino-containing polymer and at least one branched cationic polyacrylamide as retention and drainage aids,forming sheets, and drying these sheets. Polyethylenimines, with and without modification, are known for use as retention and drainage aids from, for example, German laid-open specification DE 24 34 816, DE 24 34 816 and the references cited therein describe the reactions ofpolyethylenimine with crosslinkers such as epichlorohydrin, reactions of polyethylenimine or other oligoamines with oligocarboxylic acids to give polyamidoamines, crosslinked products of these polyamidoamines, and reactions of the polyamidoamines withethylenimine and difunctional crosslinkers. Other modified polyethylenimines are known from WO 00/67884 A1 and WO 97/25367. In the processes described therein the modified polyethylenimines are obtained by ultrafiltration. These modified polyethylenimines are distinguished in particular by effective acceleration of drainage and formation, although weaknesses in filler retention and fiber retention are known from the art. Likewise possible for use as retention aids are cationic polyacrylamides, although an equivalent or improved drainage action is difficult to achieve with retention aids of this kind, Polyacrylamides of this sort are known from, for example, EP 0176 757 A2 Cationic polyacrylamides are also known, in combination with further components, in the form of what are called microparticle systems. The microparticle systems are generally admixed with polymers, such as modified polyethylenimines orpolyacrylamides, as flocculants, which are further flocculated by subsequent addition of inorganic microparticles such as bentonite or colloidal silica. The sequence in which the components are added may also be switched. EP 0 608 986 A1 discloses
Machine For The Production Of A Fibrous Web - Patent 8152968
1. Field of the Invention The present invention relates to a machine for the production of a fibrous web, for example a long-fiber paper web or a wet-laid nonwoven web. 2. Description of the Related Art Machines for the production of a fibrous web, especially a long-fiber or wet-laid nonwoven web and applicable methods to produce the webs, the so-called wet processes, are known in the state of the art. In this wet process, a fiber glass slurryis produced and allocated to a white water stream by adding glass fiber having a fiber length in the range of 6 to 40 mm, preferably 8 to 30 mm, especially 10 to 25 mm to a typical white water in a pulper for dispersion of the glass fiber in the whitewater by creating the fiber glass slurry having a fiber concentration of approximately 0.2 to 1.0 weight percent. In a sheet forming unit comprising at least one single layer, for example multi-layer, headbox this fiber glass slurry is then brought ontoan inclined wire which extends, at least in sections, at an angle to the horizontal, and is dewatered. By dewatering the fiber glass slurry, a fiber glass wet-laid nonwoven material is formed. The formed fiber glass wet-laid nonwoven is thentransferred to a binder wire which--at least in segments--is running horizontally or approximately horizontally in a binder wire section. In this binder wire section at least one aqueous binding agent, for example urea-formaldehyde (UF)-resin basedbinder, is brought onto the wet fiber glass wet-laid nonwoven by means of at least one binder headbox. The surplus binding agent is subsequently sucked off. The aqueous binding agent solution is applied onto the wet fiber glass wet-laid nonwoven bymeans of a curtain coater or a dip and squeeze applicator. However, other application methods such as spraying are also suitable. The wet fiber glass wet-laid nonwoven that is not yet conglutinated is then transferred into a drying unit including adrying wire for drying and hardening (polymerization
Method And Device For Emptying The Floor Of A Soda Recovery Boiler - Patent 8152965
The invention is related to the emptying of the floor of a soda recovery boiler. In particular, but not solely, the invention is related to the emptying of salty smelt and/or wash water from the soda recovery boiler when the boiler is beingshut down.BACKGROUND OF THE INVENTION A soda recovery boiler is used for combusting waste liquor generated in connection with pulp manufacture, containing various sodium salts besides organic matter and water. During the operation of the boiler these salts form a smelt pool on thefurnace floor, from which smelt continuously flows through smelt spouts to a dissolving tank. The smelt spouts are typically located approximately 250 mm above the level of the furnace floor. Typically, there is a smelt layer of at least approximately300 mm on the furnace floor continuously during operation. When the soda recovery boiler is shut down for maintenance, for example, the furnace floor remains covered with smelt. When the floor cools down the smelt solidifies and forms a hard "cake", which must be removed by water washing or bychiseling if the aim is to clean the floor for maintenance work or inspections. The cleaning of the floor significantly extends the shutdown period, so a method and apparatus for removing smelt from the furnace by pumping have been developed in order tosave time, as disclosed in the Finnish patent application no. 974206. The pumping is started in a situation where the surface of the salty smelt has reached the level of the lower edge of the smelt spout opening when the boiler is being shut down. Heating of the smelt is continued with a gas or oil flame and a spiral pump is used for the pumping. When using a spiral pump the smelt is pumped from the furnace floor using a straight pipe having a pipe mouth at one end and a pump drive at the other end. There is a curved portion around the middle of the pipe, forming a discharge pipethrough which the salty smelt is discharged from the pipe. In soda recovery boilers w
Press Fabric For A Machine For The Production Of Web Material - Patent 8152964
1. Field of the Invention The current invention relates to a fabric for a machine for the production of web material, especially paper or cardboard, as well as a machine for the production and/or converting of a fibrous web. 2. Description of the Related Art The continuous press fabrics utilized, for example, in press sections in paper machines move together with the web material which is to be manufactured through one or several press nips where, for example, by way of two rolls pressing together,the press fabric and the web material which is to be produced and which runs between them is being compressed on the one hand, and liquid is squeezed from it on the other hand. The squeezed out liquid is to be removed by, or through, the press fabric. For this to occur it is necessary to provide this press fabric with a permeable structure, or a structure with hollow spaces, suitable for absorption of the liquid. A structure of this type, however, obviously is also subject to press loads occurring inthe area of a press nip. Therefore there is the danger of material fatigue due to the constant compression and relaxation, or that the permeability and therefore the available hollow spaces could be greatly reduced over the duration of the operation. Especially with the modern and future press concepts where instead of the previously employed three or more press nips only two or one press nip are utilized, clearly greater press pressures than previously occur in order to achieve higher drycontents of the web. The greater press pressures result in a clearly greater material fatigue on the utilized press felts than have previously been known. What is needed in the art is a press fabric for a machine for the production of web material, especially paper or cardboard, and a machine for the production of a fibrous web with which improved liquid removal properties and a greater stabilityunder load can be achieved and with which a lasting constant dewatering capacity is achieved
Paper Substrates Useful In Wallboard Tape Applications - Patent 8152961
This invention relates to paper products and/or substrates suitable for being made into wallboard tape (also may be known as joint tape and/or drywall tape) having a pH of at least 7.0 and containing a plurality of cellulose fibers, a wetstrength additive, an alkaline sizing agent, and optionally an anionic promoter therein and/or on at least one surface of the tape and/or applied onto at least one surface and dispersed in the tape. The paper substrate is characterized by its excellentphysical properties including cross direction (CD) tensile, machine (MD) tensile, internal bond, wet tensile, hygroexpansivity, curl, bonding properties, bonding of joint tape to joint compound, etc. The paper product of the invention may be produced bycontacting the plurality of cellulose fibers with each of the wet strength additive, alkaline sizing agent, and/or anionic promoter at any other point in the paper making process. Finally, the invention relates to methods of making and using the papersubstrate.BACKGROUND OF THE INVENTION Wallboard (also known as drywall) has become the dominant material in the production of interior building partitions. In particular, interior building partitions generally comprise a studwall of spaced parallel vertical members (studs) whichare used as a support for preformed panels (wallboard) which are attached to the studwall by screws, nails, adhesive or any other conventional attachment system. Obviously, joints exist between adjacent preformed panels. In order to provide acontinuous flat surface to the wall, it is necessary to "finish" the joint between adjacent panels. Generally, such "finishing" may include the building up of multiple layers of a mastic material (joint compound) and the blending of this joint compoundand paper substrate suitable for wallboard tape utility into the panel surface so as to form the desired flat and contiguous wall surface. In addition, wallboard tape may be used to bring together a plurality of panels formin
Lignocellulosic Fibrous Material Made Of Wood - Patent 8152960
S The present application is a U.S. National Stage of International Patent Application No. PCT/EP2007/003013 filed Apr. 4, 2007, and claims priority of German Patent Application No. 10 2006 027 005.3 filed Jun. 8, 2006. Moreover, thedisclosure of International Patent Application No. PCT/EP2007/003013 is expressly incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a wood-based lignocellulosic fibrous material. 2. Discussion of Background Information Lignocellulosic fibers are used, inter alia, for the production of paper and paperboard. A large number of industrially produced lignocellulosic fibers are known, their properties differing greatly: Groundwood designates fibers which are produced by mechanical defibering of the fiber composite by beating or grinding units. During the production of groundwood, barely any woody substance is broken down. The biomass originally used is foundalmost completely again in the groundwood. The production of groundwood requires a high use of energy. Newer processes for the production of groundwood attempt to improve the fiber characteristics and/or to reduce the energy demand by pre-treating thewood with steam and/or chemicals. These processes include, in particular, CTMP (chemo-pulp) and TMP (thermomechanical pulp). In the case of CTMP, in the industrial application, between 1 and 5% by weight of the chemicals, based on oven-dry wood, arenormally used in order to permit partial dissolution of the fiber composite. Groundwood is generally characterized by low strength properties, in particular low tearing (breaking) length, and high opacity and light scattering with a low whiteness with ahigh tendency to yellowing. Chemical pulp designates fibers which are produced by chemical dissolution of the fiber composite. During the production of chemical pulp, chemicals are used which normally act on the biomass under high pressure and high temperature.
Process And Machine For Making Air Dried Tissue - Patent 8152967
BACKGROUND Traditional concepts presently employed today include but are not limited to through air drying (TAD) and conventional machines. An example of a process and machine for making tissue paper using TAD is set forth in U.S. Pat. No. 5,656,132,which is incorporated by reference. The most common methods of drying an uncoated or unsized sheet of paper, including tissue, use cast iron dryer cans or larger structures called "Flying Dutchman" or "Yankee Dryers," both of which are also cast irondrums. All of these conventional cast iron drums are rotating devices. Examples of air floatation dryers and their use to dry a variety of substrates are set forth in U.S. Pat. Nos. 3,982,328, 4,218,833 and 5,749,164, each of which is incorporated by reference. Air floatation drying has been used on a papermachine after the paper web has been initially dried. The air floatation drier is arranged after a size press or a precoater, before the coated paper web enters a conventional dryer section composed of conventional cast iron dryer cans to dry theapplied coating. The air floatation dryer was used in this manner to prevent the transfer of the wet coating or sizing chemicals to the hot conventional cast iron dryer cans. Air floatation dryers used for this purpose did not have an endless loop tosupport the wet, coated web in the dryer. Rather, the air cushion in the air floatation dryer would support the wet, coated paper web without contact with another surface. In this manner the surface of the freshly applied coating or chemicals was notdamaged. Pulp and heavy weight paper grades have been dried using an enclosed air dryer. The dryers used in such processes use a transport chain or metal belt that has a very open design that are unsuitable for conveying a wet tissue web and are notcapable of the high speeds associated with tissue manufacture.SUMMARY The technology described herein provides a process and machine for making tissue grade paper, e.g., bath or faci
Use Of Chemical Pulp Mill Steam Stripper Off Gases Condensate As Reducing Agent In Chlorine Dioxide Production - Patent 8152956
The present invention relates to the use of a waste stream, more especially overhead steam stripper off gases from a chemical pulp mill to produce chlorine dioxide. This gaseous stream contains methanol and total reduced sulphur (TRS)compounds, such as hydrogen sulphide, which, once condensed to the liquid form, can act as reducing agents in the chlorine dioxide generator thereby eliminating the need for purchased methanol and providing a new approach for dealing with the disposal ofTRS-rich steam stripper off gases.BACKGROUND ART Condensates from the digester or the evaporation areas of a kraft pulp mill are contaminated with volatile organics, sulfur-containing components, fibers, and black liquor carryover. More than 60 different compounds have been detected in foulevaporator condensate from a kraft pulp mill. The major pollutants of concern are total reduced sulfur (TRS) compounds and methanol. The main TRS components are: hydrogen sulphide (H.sub.2S), methyl mercaptan (CH.sub.3SH), dimethyl sulphide(CH.sub.3SCH.sub.3) and dimethyl disulphide (CH.sub.3SSCH.sub.3). Other organic compounds found in digester and evaporator condensates include: ethanol, acetone, methyl ethyl ketone, terpenes, phenolics, and resin acids. A typical kraft mill producesabout 7 to 15 kg of methanol per ton of pulp. Due to the presence of TRS compounds, the foul condensate cannot be used within the mill. Mills which sewer a portion of their condensates must increasingly deal with several problems such as: additional BOD loading to the effluent treatmentsystem, emission of odorous compounds and cooling of the condensates before discharge. Several treatments such as biological treatment, thermal oxidation and chemical oxidation have been devised to remove TRS and methanol from this stream. U.S. Pat. No. 6,579,506, for example, dealt with the chemical oxidation of a gas stream containing the above TRS compounds using chlorine dioxide solution. Steam stripping technology has been t
High Fiber Support Intrinsic Warp-tied Composite Forming Fabric - Patent 8147653
S This application is a Submission Under 35 U.S.C. .sctn.371 for U.S. National Stage Patent Application of International Application Number: PCT/CA2009/000807, filed Jun. 9, 2009 entitled "HIGH FIBER SUPPORT INTRINSIC WARP-TIED COMPOSITEFORMING FABRIC," which claims priority to Canadian Application Serial No. 2,634,432, filed Jun. 9, 2008, the entirety of both which are incorporated herein by reference.FIELD OF THE INVENTION This invention relates to woven industrial fabrics for filtration and formation of a cellulosic fibrous sheet, and in particular to papermakers' forming fabrics that provide high fiber support, and improved drainage properties. The inventionmore particularly relates to an intrinsic warp-tied composite forming fabric in which all the warp yarns of the paper side surface comprise pairs of intrinsic binder yarns arranged so as to bind the paper and machine side fabric structures together, andin which the ratio between the number of machine side warp yarns and the effective number of warp yarn paths in the sheet side is at least 1.5:1.BACKGROUND OF THE INVENTION This invention relates to flat woven industrial fabrics generally intended for filtration in sheet formation. However, the invention has particular applicability to papermakers' forming fabrics, and will be discussed primarily below in relationto such fabrics, although it is equally applicable to many industrial filtration uses where fiber support, fabric drainage rates and dimensional stability are important criteria. In the discussion that follows, the following terms and corresponding abbreviations have the following meanings assigned to them: Center Plane: a notional plane passing through the center of the fabric parallel to both the paper side (PS) and machine side (MS) of the fabric. In a woven fabric, this plane is occupied in part by the interwoven warp and weft yarns. Center Plane Resistance (CPR): the resistance within the region of the center plane to the passage of fluid t
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