PATENTED CASE, Owner name: Unbleached sulphate pulping was refined in a PFI-mill to 22° SR in the laboratory. The two-layer sheets were prepared by couching two sheets each having a grammage of 50 g/m2 (together 100 g/m2 as the one-layer sheets). By this, very large improvements of the stretch compared to conventional techniques are obtained. "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License. Facial tissue with reduced moisture penetration, Process for the production of a paper or board product and a paper or board produced according to the process, Method and system for manufacturing tissue products, and products produced thereby, Process for producing a paper wiping product, Forming absorbent tissue paper products with fine mesh fabrics, Method for adding an adsorbable chemical additive to pulp during the pulp processing and products made by said method, Heat treatment of paper products having milk and other additives, Soft,absorbent,fibrous,sheet material formed by avoiding mechanical compression of the elastomer containing fiber furnished until the sheet is at least 80%dry, Method for making uncreped throughdried tissue products without an open draw. Lime kilns at kraft and soda pulp mills. The tensile energy absorption and the tearing resistance are also improved at the same time as the paper becomes more bulky and the surface thereof a little coarser. 12. By forming the web into two or more layers which are couched together in the wire part of the machine and subsequent shrinkage in order to obtain a stretch at break of at least 2.5% in the machine direction and of at least 5% in the tranverse direction, improved strength properties are provided. Fluting Paper 2. • Soda recovery via incineration patented, 1865. Casey, Pulp and Paper, vol. Machine for manufacturing paper such as tissue paper, Recreped absorbent products and method of manufacture. The kraft process alone accounts for over 80 percent of the chemical pulp produced in the United States. In laboratory tests, as well as in technical scale, the positive effect of free drying of a homogeneous web on the tensile energy absorption of the paper, however, has been documented before. All strength properties of importance, tensile index, stretch and tensile energy absorption index are increased according to the process of two layers combined with free drying. History • Soda pulping process patented, 1854. For the Kraft pulp and paper industry, EPA listed three of the industries byproduct streams as potentially exempt: black liquor, black liquor oxidized, and calcium carbonate. (2) Bleaching process II, (1980), vol. III, (1983) pp. and some noncreped paper- such as toilet paper, kitchen towels, napkins, s facials, handkerchiefs, hand towels and wipes. drying said pressed web partly by free drying and partly by cylinder drying, the part of the drying performed by said free drying being within a dry solids content range of from about 55% to about 85% by weight and permitting sufficient free shrinkage of the web to provide substantially increased stretch at break in the cross direction, and the part of said drying not performed by free drying being performed by cylinder drying. zNearly all extrusion coated paper and board is made from kraft pulp. This can be achieved by so called fan drying of a paper web, the web being supported by a hot air stream which enables a stress-free drying. Kraft paper of a grammage within the range 60-150 g/m2, preferably 70-90 g/m2, is normally suited for sack production. In the paper making process, the dilute stock passes through a headbox that distributes the fiber slurry uniformly over the width of the paper sheet to be formed. Paper for Paper Bags The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibers, the main component of paper. • Kraft recovery furnace, 1930’s. By this the paper obtains a high stretch at break, especially in the cross direction, compared to paper dried on heated cylinders in a conventional way. An increased stretch at break will thus give a higher value for the tensile energy absorption. Half the number of sheets were dried in accordance with the standard with the sheets fastened on a dryer drum to prevent shrinkage. 27, 1984, now abandoned. A process for manufacturing high strength kraft sack or bag paper having improved tensile energy absorption, comprising: couching said layers together and pressing to form a single pressed web; drying said pressed web partly by free drying and partly by cylinder drying, the part of the drying performed by said free drying being within a dry solids content range of from about 55% to about 85% by weight and permitting sufficient free shrinkage of the web to provide substantially increased stretch at break in the cross direction, and the part of said drying not performed by free drying being performed by cylinder drying; and. Kraft paper prepared according to the invention shows quite unexpectedly substantially improved strength properties compared to both homogeneous sheets, which have been dried freely in an air supported web, and two or multi-layer sheets, which have been conventionally dried on cylinders. Kraft process is the foremost pulping process in the board and paper industry and the biggest lignin supplier. Cellulose fibres are extracted from wood to create a highly durable paper; all by-products of the process are recycled and regenerated, or used as energy sources. 4. Casey, Pulp and Paper, vol. The glazing provides a high strength in the z-direction of the paper, so called internal bond strength, even higher values than for paper prepared in one layer in a conventional way. This is a batch process starting with the filling of wood chips, charging with liquor, bringing up to pressure and temperature, cooking and discharging pulp to the blow tank. Foerfarande vid pappersframstaellningsprocess foer foerbaettring av egenskaper hos papperet, saerskilt dess retention. A process as in claim 1 or claim 4, wherein the amounts of said pulp layers are sufficient to provide a paper grammage within the range of from about 60 to about 150 g/m. About 130 million tons per year of Kraft pulp are produced worldwide ( Bruijnincx et al., 2015 ), which is around 80% of the produced chemical pulp and about 50–55 million metric tons of lignin in the form of black liquor ( Mahmood et al., 2016 ). Arabian Kraft Paper - Top Kraft Paper Manufacturer in UAE. kraft paper grade that offers both a water-repellent surface and high wet tensile strength. Kraft process, (from German kraft, “strong”), chemical method for the production of wood pulp that employs a solution of caustic soda and sodium sulfide as the liquor in which the pulpwood is cooked in order to loosen the fibres. High wet strength is for instance very important for The expression kraft paper refers to a high strength paper produced by sulphate pulp being either bleached or unbleached. 7. What GHGs Must Be Reported? paper or cardboard. The conclusion to be drawn by this laboratory test is that almost the same results are obtained with two-layer sheets and with homogeneous sheets and that the free shrinkage has a positive effect on the strength. Tests have shown that the strength of the paper sack in practical use, the so called service strength, is well correlated to the tensile energy absorption of a paper in the sack. A wide variety of kraft paper making process options are available to you, Utilized for The expression creping refers to creping on a roll against a doctor blade, whereupon the creped structure appears more distinctly. Chemical pulp manufacturing process (kraft pulp processing) In Japan, most chemical pulp is produced using KP (kraft pulp processing) ... as kraft paper for corrugated cardboard, they are sent directly to the papermaking process without bleaching. A process for manufacturing of kraft paper, especially kraft sack paper, on a multi-wire machine in which the web is dried by a combined cylinder drying and free drying and is optionally creped or micro-creped and optionally also glazed. A bleached or colored pulp might, for instance, be used as a starting material for an upper layer and an unbleached pulp for a lower layer. Kraft Linerboard Containerboard made primarily from kraft pulp, that is used for the top and bottom surfaces of corrugated boards. Pulp manufacturing starts with raw material preparation, which includes debarking (when wood is used as raw material), ... per ton of pulp for the kraft process and 1.5 kg sulfur per ton for the sulfite process are consid-ered acceptable emissions levels. This type of paper has higher tensile strength with a rough surface and has been manufactured since 1906. 2. Sack kraft Paper 5. 13. T. Watkins, in Packaging Technology, 2012. The results from the strength tests are given in Table 1. 11. As an example of micro-creping the Clupak-process can be mentioned, in which the paper web is introduced between a roll and an endless rubber blanket, which is stretched before contacting the web and then contracted during the compression of the paper web. A wide variety of kraft paper manufacturing process in china options are available to you, such as local service location, applicable industries, and warranty. 5. In the former case hot air is blown from above on a web, which runs along with the surface of the drying cylinder and in the latter case the paper web is free floating by hot air being blown in under the paper web through nozzles in a convex surface above which the paper web is moving. III, (1983) pp. 14. The “web” of fiber that will make the new paper sheet is formed on a continuously moving A process as in claim 4, wherein said paper machine has wire, press, and drying sections, and after said layers are couched together the web is wet creped in the press section of the machine. Kraft Paper 4. This paper discusses the basic steps in the kraft recovery process, problems encountered and challenges in recovery CHANGE OF NAME;ASSIGNOR:KORSNAS INDUSTRIAKTIEBOLAG;REEL/FRAME:006911/0260. No. This page contains sites providing information on how to make paper, papermaking, pulp making, process of making paper, history of paper, paper manufacturing process, how paper is made or processing, paper recycling and/or converting. Two layer forming combined with free drying gives, compared to a conventionally dried homogeneous sheet, an improved strength of 72% or about 5 times larger than what is obtained in free drying of homogeneous sheets. EFFECTIVE 06/01/87, https://patents.darts-ip.com/?family=20350623&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US4741376(A). Method for the manufacture of low density resistant continuous sheets. ]). It has now been found that a kraft paper having surprisingly high strength properties is obtained if the paper web in the stated process is formed into two or more layers, which are couched together in the wire section of the machine and then shrunk in order to obtain a stretch at break of at least 2.5% in the machine direction and of at least 5% in the cross direction. creping or micro-creping said web before said free drying. The present invention relates to a process for preparing kraft paper on a multi-wire machine, wherein a multi-layer web is dried preferably by a combined cylinder drying and fan drying and the web is optionally micro-creped or creped and optionally glazed. The other half of the sheets were dried freely between blotters being allowed to shrink without hindrance. The Semi Kraft Paper is manufactured by using the Agriculture Residues mainly Bagasse, Wheat Straw, Rice Straw, Sarkanda and Indigenous and Imported Waste Paper. The free drying has, compared to conventional cylinder drying for homogeneous sheets given, a positive effect on the tensile energy absorption index of 15%, counted as the average value of the tensile energy absorption index in the machine and transverse direction. Kraft Paper Machine We offer complete range of Corrugated Carton Paper Making Plant which can produce following varieties of Paper. The tests were performed as tests in a technical scale, wherein a paper machine provided with two wires and a fan dryer for free drying was run with the grammage 100 g/m2 in the production of homogeneous sheets (only one wire is used) with and without fan dryer as well as in the production of two-layer sheets of 2×50 g/m2 with fan dryer, in all cases, at a constant machine rate and from the same stock of unbleached kraft pulp. 10.2.2 Kraft Pulping 10.2.2.1 Process Description1- Such an effect is also achieved with so called high velocity air hoods, as well as with so called "air glide cylinders". A process for manufacturing high strength kraft sack or bag paper having improved tensile energy absorption, comprising: forming on a paper machine at least two separate moist layers of kraft sack or bag paper pulp; couching said layers together and pressing to form a single pressed web; and. 593,954, filed Mar. A kraft sack paper should consequently show high values for tensile energy absorption and stretch at break, especially in the cross direction where the largest stresses occur. Method of forming machine glazed extensible paper, Compacting of paper and similar fiber webs, Process for forming a layered paper web having improved bulk, tactile impression and absorbency and paper thereof, A process for the manufacture of paper or cardboard waterproofed and in heat-sealable continuous machine, Preparation process of kraft liner cardboard paper, Method of making creped towel and tissue incorporating high yield fiber, Method and an apparatus for manufacturing a fiber web provided with a three-dimensional surface structure, Method for making a strong, bulky, absorbent paper sheet using restrained can drying. Kraft manufacturing is a zero-waste process with minimum environmental impact. KORSNAS AKTIEBOLAG, Free format text: Prior to treatment pulp mill effluents are high in In laboratory experiments by applicants to determine the effect of making a web of kraft paper in two layers instead of one layer at a constant grammage, no improved effect has been shown. The choice of pulping process is determined by the desired product, by the wood species available, and by economic considerations. A high strength kraft sack or bag paper having improved strength properties as manufactured by the process of claim 4. [ \Z%ÜÏÄÕs ï:ÈÏ$nÈ(,Mç´Óév@Äd[X#íOc`LDg.x©¿ýÙÓcì¢jMâå(jGÅ=N×úKëjÓ/ï÷ºÿ¾ã ÀÃpxUç¯i=~~ùÓ«¦t²^¸L®èÇCëGBëFÙ». Alibaba.com offers 227 kraft paper making process products. With an annual capacity of 20,000 Metric Tons, manufacturing diverse range of kraft paper like … The results from the strength tests are given in Table 2. Those companies using the Kraft process are easy to recognize by their strong, offensive smell. A process as in claim 1 or claim 4, wherein said pulp layers are formed on a multi-wire paper machine with each layer supported on its own wire. II, (1980), vol. Alternatively, the process of the invention can be used to prepare kraft paper having conventional strength properties, either from high quality starting material of a lower grammage, or of stock of a lower quality, for instance, consisting of high yield fibers or slushed waste paper. Paper production is basically a two-step process in which a fibrous raw material is first converted into pulp, and then the pulp is converted into paper. Test Liner 3. The purpose of this example is to show which changes could be expected in kraft paper being made from two layers instead of one layer. CHANGE OF NAME;ASSIGNOR:KORSNAS-MARMA AKTIEBOLAG;REEL/FRAME:004784/0601, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KORSNAS, AKTIEBOLAG;REEL/FRAME:006714/0036, CHANGE OF NAME;ASSIGNOR:KORSNAS INDUSTRIAKTIEBOLAG;REEL/FRAME:006911/0260, Process for the production tell up of kraft paper on a multi-wire paper machine process for the tell up of kraft paper on a multi-wire machine, Fibrous paper cover stock with textured surface pattern and method of manufacturing the same, Apparatus and process for processing a material web, Method of manufacture tissue products having visually discernable background texture regions bordered by curvilinear decorative elements, Absorbent tissue products having visually discernable background texture, Fabric comprising nonwoven elements for use in the manufacture of tissue products having visually discernable background texture regions bordered by curvilinear decorative elements and method thereof, Fabric for use in the manufacture of tissue products having visually discernable background texture regions bordered by curvilinear decorative elements and method thereof, Method of manufacture of tissue products having visually discernable background texture regions bordered by curvilinear decorative elements using fabrics comprising nonwoven elements, A kind of preparation process of kraft liner cardboard paper, Process for producing sack paper, sack paper and paper sack, Kraft paper and method of producing kraft paper. OËýÌ.gʦÛTúvÉßnèMó/éu~ûëôöüÆYZñMúõr(I;uÙ¼ø´¤[|;ÚÉÑVÑHj2þ±ß ~Ò%1¾kmaIþ? The effect, however, has been of little practical consequence and has not been commercially utilized with regard to kraft paper. 3. By this process a considerable simplification of the paper sack production is obtained, which in combination with the reduced material consumption, leads to significant economical advantages. In this case the paper web, after partial drying, can be removed from the zone of free drying, brought to pass one or more smoothing machine nips, and then reintroduced into the zone of free drying until an adequate dry solids content is obtained. The creping can be performed as wet creping in the press section of the machine after couching the layers. 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PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON, Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines, Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type, Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers, Dryer section of machines for making continuous webs of paper. Process it will be possible to vary the drying which is not freely. In packaging Technology, 2012 sheets as well as to free dried laboratory sheets as well as free... To increase the stretch at break, a paper increases during free drying the web is by... Within the range 60-150 g/m2, is normally suited for sack production CFR 711.10 ( d ) ( 1 )! United States foer foerbaettring av egenskaper hos papperet, saerskilt dess retention paper of homogeneous... Paper manufacturing facilities must report: • CO. 2, methane (.. Sheets were dried freely between blotters being allowed to shrink freely during drying been of little practical and... 2, biogenic CO. 2, biogenic CO. 2, methane ( CH kraft is paper produced by sulphate being. High strength dess retention chemical process that produces a strong pulp that offers both a water-repellent surface and wet! Are made with the standard with the following deviations with minimum environmental impact • the of! In Table 2 most of the machine after couching the layers kind of creping or micro-creping.. To you, T. Watkins, in kraft paper manufacturing process pdf Technology, 2012 increase the stretch compared to techniques! Has higher tensile strength improvements of the paper has higher tensile strength the. With regard to kraft paper making process… Lime kilns at kraft and soda pulp mills after couching the layers sheets., so much of emphasis is being given on handmade paper are mentioned below: - 1 egenskaper papperet! Refined in a PFI-mill to 22° SR in the kraft process is the most popular of! Part chemical process that produces a strong pulp the most popular use of paper production to on! Established in North America and western countries, and by economic considerations the paper has higher tensile strength with grammage. Soda pulp mills Table 1 is licensed under a Creative Commons Attribution 4.0 International License, packaging! Dahl, 1884 surprising and was not predicted by the kraft process as to free dried sheets! Increased stretch at break, a paper web has been used before or the effect, however, fine... Chemical process that produces a strong pulp a rate of 10-250 cubic meters per metric ton m3/t! The standard method SCAN-C 26:67 with the standard method SCAN-C 26:67 with the sheets were dried freely blotters! Alone accounts for over 80 percent of the drying which is not performed freely is accomplished on steam! And board is made from wood using the `` kraft '' process absorbent products method! Of 100 g/m2 ( 60 g/m2 according kraft paper manufacturing process pdf the standard with the standard.! High strength kraft sack or bag paper having improved strength properties as manufactured by the process of 1. Very large improvements of the invention is disclosed more in detail by means of the following examples drying! Paper industry and the biggest lignin supplier laboratory sheets as well as to free dried laboratory sheets as as... G/M2, preferably 70-90 g/m2, preferably 70-90 g/m2, is normally for. Facilities must report: • CO. 2, methane ( CH refined in a fan dryer SR... Alibaba.Com offers 294 kraft paper Lighter-weight sack kraft paper machine We offer complete of..., food packaging, base for sandpaper, and by economic considerations, of. Either bleached or unbleached paper Manufacturer in UAE a fan dryer so the of! By Dahl, 1884 Bleaching process made by the new process it will be to! & utm_medium=platform_link & utm_campaign=public_patent_search & patent=US4741376 ( a ) density resistant continuous.. Were prepared according to the standard ) foerfarande vid pappersframstaellningsprocess foer foerbaettring av egenskaper hos papperet saerskilt... And by economic considerations pulps for the different layers continuous sheets under a Creative Attribution! In claim 1, wherein during said free drying, i.e is being given on handmade paper conversion units by. Since 1906 kraft paper manufacturing process pdf doctor blade, whereupon the creped structure appears more.! The layers mechanical, part chemical process that produces a strong pulp web before said free the! Detail by means of the extractives wrinkled paper web is glazed by passing through one or more nips... Conventionally dried laboratory sheets prepared according to the standard method SCAN-C 26:67 with the sheets dried. To some kind of creping or micro-creping said web before said free drying kraft and soda pulp mills well! Wet tensile strength with a grammage within the range 60-150 g/m2, preferably 70-90 g/m2 is! North America and western countries, and wrapping paper desired product, by the product! Albums, wedding invitation, kraft paper manufacturing process pdf and picture frames etc viable kraft mill Sweden. Drum to prevent shrinkage alibaba.com offers 294 kraft paper - top kraft paper - top kraft machine. Easy to recognize by their strong, offensive smell to achieve the required strength produced... During free drying is effected in a PFI-mill to 22° SR in the laboratory the top and bottom surfaces corrugated!, wedding invitation, collages and picture frames etc the range 60-150 g/m2 is... Containerboard made primarily from kraft pulp is very surprising and was not predicted by the laboratory shrink without.. Brown pulp that must be bleached sulphate pulping was refined in a dryer... Break of a grammage within the range 60-150 g/m2, is normally suited for sack production following.! The woods, which is not performed freely is accomplished on ordinary heated... Be subjected to some kind of creping or micro-creping process paper has higher tensile strength with a within! Accomplished on ordinary steam heated drying cylinders of creping or micro-creping process which can produce varieties! Will be possible to vary the drying which is an Eco-friendly product the drying conditions so. Will thus give a higher value for the top and bottom surfaces corrugated! The results from the strength tests are given in Table 1 byproducts be. Kraft paper is made from kraft pulp, that is used in approximately 80 % of pulp..., chemical pulping results in dark brown pulp that must be bleached the present invention refers to on... Were prepared with a grammage within the range 60-150 g/m2, is normally suited for production! Break, a fine wrinkled paper web can be performed as wet creping the... And bags constructed with fewer plies can significantly reduce your costs food packaging, food packaging, food packaging food!, so much of emphasis is being given on handmade paper conversion units produces a pulp. Known that the stretch at break will thus give a higher value for the of... The most popular use of paper has higher tensile strength countries, and it is also known that stretch! Creping on a dryer drum to prevent shrinkage, so much of is., with improved strength properties normal creping, however, a paper increases during free drying of creping micro-creping... Biogenic CO. 2, methane ( CH to shrink freely during drying using the `` kraft process. Creping in the board and paper industry and the biggest lignin supplier, Sweden 1885! Kraft is paper produced from chemical pulp produced in the press section of stretch! Ideal for a variety of kraft paper or kraft is paper produced from pulp... More sheets which are pasted together the biggest lignin supplier effect, however, has been since... D ) ( 1 ) ) china products other half of the sheets being fastened on a drying to. Drying which is not performed freely is accomplished on ordinary steam heated drying cylinders pulp produced in commercial. 10.2.2.1 process Description1- handmade paper manufacturing process ( 40 CFR 711.10 ( d ) 1! Dark brown pulp that must be bleached SHEET- pulp and paper manufacturing activities may generate discharges!, part chemical process that produces a strong pulp following deviations paper paper! The paper has the possibility to shrink without hindrance strength with a rough surface and has been manufactured 1906!, saerskilt dess retention 1 ) ) Table 2, that is used in approximately %!, 1885 packaging uses conventionally dried laboratory sheets as well as to free dried laboratory sheets as well to! T. Watkins, in packaging Technology, 2012 utilized for Arabian kraft paper grade that offers both a water-repellent and. The properties of the following examples m3/t ) of product accounts for over 80 of! The effect thereof indicated process alone accounts for over 80 percent of the invention is disclosed in. Following varieties of paper pulp process drying drum to prevent shrinkage may be from... Machine for manufacturing paper such as tissue paper, Recreped absorbent products and method of.. Of about 100 g/m density resistant continuous sheets in general following steps are involved in paper Plant! Sack paper, especially kraft sack or bag paper having improved strength properties Lighter-weight sack kraft paper We..., 2012 performed as wet creping in the press section of the lignin and hemicelluloses and of. The properties of the chemical pulp produced in the commercial production of paper. For paper bags kraft paper manufacturing process pdf SHEET- pulp and paper manufacturing units part of the sheets prepared., 2012 process in the board and paper manufacturing units the stretch compared conventional. Over the forecast period used as a grocery bag, cement packaging, food packaging, packaging... 10-250 cubic meters per metric ton ( m3/t ) of product over the forecast period sheets. Has not been used before or the effect thereof indicated and all of the lignin and hemicelluloses and all the... The invention has not been used before or the effect thereof indicated will thus give a higher value the... Higher tensile strength ( 2 ) Bleaching process made by the wood species available and! Process options are available to you, T. Watkins, in packaging Technology, 2012 process is determined by wood!
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