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WO2025111676A1 - Procédé de recyclage de papier-monnaie ou de papier spécial, suspension fibreuse, fibre recyclée et utilisation de celles-ci et papier obtenu - Google Patents

Procédé de recyclage de papier-monnaie ou de papier spécial, suspension fibreuse, fibre recyclée et utilisation de celles-ci et papier obtenu Download PDF

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Publication number
WO2025111676A1
WO2025111676A1 PCT/BR2024/050357 BR2024050357W WO2025111676A1 WO 2025111676 A1 WO2025111676 A1 WO 2025111676A1 BR 2024050357 W BR2024050357 W BR 2024050357W WO 2025111676 A1 WO2025111676 A1 WO 2025111676A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
recycled
water
fibrous
fibrous suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/BR2024/050357
Other languages
English (en)
Portuguese (pt)
Inventor
Marcos Pereira
Nathalia SALLES RUIVO DE BARROS
Alexandre AMBROZIO GILBERTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blendpaper Security Papeis Especiais SA
Casa Da Moeda Do Brasil Cmb
Original Assignee
Blendpaper Security Papeis Especiais SA
Casa Da Moeda Do Brasil Cmb
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from BR102023024821-7A external-priority patent/BR102023024821A2/pt
Application filed by Blendpaper Security Papeis Especiais SA, Casa Da Moeda Do Brasil Cmb filed Critical Blendpaper Security Papeis Especiais SA
Publication of WO2025111676A1 publication Critical patent/WO2025111676A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the present invention applies to the fields of recovery or utilization of waste materials.
  • the present invention discloses a process for recycling waste material from the banknote production process.
  • the banknote production process normally generates solid waste from printed or unprinted paper rejects due to quality problems, paper rejected for printing adjustments, possible paper from printer jams, refills from the process of cutting sheets until the final format of the banknotes is correct, and also printed banknotes rejected due to possible printing errors or any other unacceptable defects. To deal with this waste, they are duly shredded (scraps) in special machines at the printing companies to de-characterize them in order to avoid any improper use of the material after it is destined for disposal or recycling.
  • paper scraps can play a crucial role in reducing waste and promoting sustainability. For example, they can be recycled, which allows them to be used as a source of fiber in the manufacture of high-quality papers.
  • This practice not only helps to minimize the environmental impact by reducing the amount of waste sent to landfills, but also contributes to the preservation of natural resources, as it avoids the need to produce paper from virgin raw materials.
  • the present invention provides a process for recycling current paper money, based on its composition. In this way, recycling scraps from the banknote production process illustrates the importance of the circular economy and the responsible use of resources in the printing industry.
  • Document PI 9605508-1 reveals the development of a technology that enables the recycling of papers containing chemical additives based on formaldehyde-melamine, a product commonly known as wet strength.
  • Such papers in this case currency papers, are currently incinerated or deposited in landfills and sanitary landfills, as there is no national technology that allows them to be reused by the recycling industry. This causes environmental and ecological problems, as such material does not decompose or dissolve in water, remaining intact in the soil, releasing printing ink and pollutants.
  • this technology was developed that enables the reuse of papers impregnated with formaldehyde-melamine. To this end, alkalis are used together, products that act on the chemical bonds of formaldehyde-melamine.
  • Document CN109294034 reveals a method for transforming waste banknotes into recycled composite material.
  • the method comprises the following steps: Step 1. Pretreat the waste banknotes and confidential waste paper to optimize the fiber structure and morphology to obtain pre-modified fibers; Step 2. Weigh in parts by weight: 30-50 parts of pre-modified fiber, 52-67 parts of recycled polyethylene particles, 1-3 parts of maleic anhydride grafted polyethylene, 0.5-1 parts of polyethylene wax, 0.1-0.2 parts of light stabilizer, 0.1-0.2 parts of antioxidant 168; Step 3.
  • the pre-modified fiber and recycled polyethylene granules weighed in step 2 are placed in a high-speed mixer, mixed well, and then maleic anhydride grafted polyethylene, polyethylene wax, light stabilizer and antioxidant are added sequentially. Mix the antioxidant 168 to obtain a mixture I, and add the mixture I to the twin-screw flat extruder from the main feeding port in a uniform feeding manner, and extrude the granules for sealing; Step 4.
  • the extruded pellet obtained in step 3 is injection molded by an injection molding machine, and then demolded and cooled to obtain a composite material.
  • the document above reports the transformation of paper scraps with RU as part of a polymeric material, which will serve as raw material for the extruder.
  • Document BR 10 2019 003165 4 describes the production of polymer composites based on polypropylene and banknotes (banknotes referring to any currency) for the manufacture of objects made of polypropylene as the main material.
  • the polypropylene used can be virgin and/or recycled. Blends of polypropylene and other polyolefins are also considered, aiming to provide a viable alternative to significantly reduce the accumulation of this waste.
  • This technology has enabled an efficient method for recovering waste banknotes unsuitable for circulation based on the production of composites containing polypropylene, without the need for prior treatment of the note and impregnation. with resins.
  • the choice of polypropylene is related to its wide industrial use, due to the diversity of items produced based on this polymer.
  • the installed capacity to produce the same items made of all types of polypropylene was used, using the composite produced with virgin polypropylene and/or recycled with banknotes. From the composite produced, it is possible to mold items used in the automotive and packaging industries, to manufacture toys, furniture, among others.
  • the document above reports the reuse of paper money as an integral material of a polymeric compound aimed at the manufacture of new objects.
  • the banknote production process generates solid waste, such as paper rejected due to quality issues and printing errors, resulting in a considerable amount of waste that needs to be managed properly.
  • the present invention offers a current paper money recycling process, based on its composition.
  • the recycling of scraps from the banknote manufacturing process highlights the relevance of the circular economy, the responsible use of resources in the printing industry, the reduction of the consumption of virgin fibers in paper production and the reduction of the volume of waste destined for landfills.
  • FIG. 1 illustrates the simplified flowchart of the process covering step (c);
  • Figure 2 illustrates the material to be recycled
  • FIGS 3 and 4 illustrate the final product obtained in step (c).
  • the present invention discloses a process for recycling special or security paper, comprising the steps of:
  • Special or security paper is defined as: paper money, wine labels, abrasive paper, passport, decorative paper, stamps, official documents, among others, which contain wet-resistant resin (RU).
  • RU wet-resistant resin
  • the material to be recycled is special or security paper, preferably with a 100% cotton composition by weight and a resin with wet strength (WW) greater than 0.25% of the final paper (1000 kg cotton paper / 2.50 kg resin), such as residual materials from the production of banknotes or from any other source, such as notes withdrawn from circulation on the market, without the need for prior cleaning.
  • WW wet strength
  • the size of the material to be used in the process can be variable; preferably, it is suggested to use perforated material, as illustrated in Figure 2, since the larger the contact area, the greater the favoring of the chemical reactions present here; however, size is not an impediment.
  • step (a) the material is weighed, for example, 1000 kg or 2000 kg, depending on the equipment used in the process.
  • the material is subjected to thermal and chemical treatment aimed at breaking it down into reusable fibers, breaking down the original wet strength of the special or security paper, dissolving the polyester-based security threads, for example, and dispersing the various inks, metallic pigments, resins and varnishes used in the banknote printing process.
  • Thermal and chemical treatment is carried out in equipment that perform agitation at the time of cooking, for example, spherical or cylindrical rotary digesters or autoclaves.
  • these equipments are built in carbon steel coated externally with insulating material for better heat exchange, avoiding thermodynamic losses.
  • the capacity for a spherical digester with a volume of 10.8 m3 is 1000 kg of material per batch and for a cylindrical digester with a volume of 23 m3 it is 2000 kg per batch.
  • the material to be recycled is dosed with water and an alkaline agent, preferably caustic soda.
  • the concentration of the alkaline agent used is 48.5% to 50.5% by weight, preferably 50% by weight.
  • the proportions used in the process include a load of 2 parts of water and 0.1 part of alkaline agent for 1 part of material to be recycled (volume/weight), for example, for every 2000 L of water, 1000 kg of material to be recycled and 100 L of alkaline agent are used.
  • the quality of the water to be used is invariable, being possible, for example, the use of industrial water, which includes a color standard > 30 uc and turbidity > 2.0 ntu.
  • the internal pressure of the equipment is raised from 4.3 to 4.7 bar and controlled by introducing saturated steam from, for example, a boiler in the company's utilities area.
  • a movement preferably rotational, is applied with the aim of homogenizing the material during the process, making the chemicals interact uniformly with the shavings being treated.
  • the cooking equipment is depressurized, it is opened using the hermetic lid and the treated material is transferred to a tank. where it will be fed to the next stage, washing the material.
  • step (b) the material is washed to reduce the pH of the medium, preferably under moderate agitation.
  • the washing is carried out by adding water with a pH close to 7 to the tank and leaving the recently cooked material from step (a) to soak in the equipment for an average time of 3 hours.
  • aluminum sulfate 11 - 12% m/m and pH 3.0 in a 1% solution can be added, in a proportion of 0.02 parts of aluminum sulfate to 1 part of recycled material (volume/mass), to speed up the washing due to the reduction in pH.
  • the water is removed and new water is added to the washing tank.
  • the pH of the suspension is controlled; when values between 7.0 and 8.0 are reached, the process is finished, thus obtaining a fibrous suspension with a neutral pH that can be used to produce any product that uses this raw material, in the production of paper and any other product of fibrous origin.
  • the fibrous suspension obtained from the process comprises neutral pH between 7.0 to 8.0 and 50% in water.
  • step (c) In order to produce special paper, an additional step can be implemented in the process, which is the extraction of water, step (c). This extraction facilitates the use of the fibrous suspension in the paper production process.
  • step (c) the extraction of water from the material after washing is carried out by removing water from the fibrous suspension by means of gravity drainage on a forming screen, for example made of polyester, and subsequently the material is pressed, for example with pneumatic pressure of between 3 - 4 bar, and, preferably, with a wet press up to a value of up to 50% moisture in the recycled material.
  • a forming screen for example made of polyester
  • the wet press can be lined with felt.
  • This process does not remove the color entirely from the base material used, as the resulting fibers still contain a certain amount of particles from pigments, security threads, etc.
  • the total process loss is estimated at approximately 10% of the original quantity of banknote trimmings initially purchased.
  • a recycled fiber is obtained that can be used in the production of paper and any other product of fibrous origin, as illustrated in figures 3 and 4.
  • the fiber obtained from the process with the addition of step (c) has a pH between 7.0 and 8.0, an average moisture content of 10% to 50% and a light and opaque color.
  • step (b) the special paper obtained from the process of the present invention can be carried out directly from step (b) with the fibrous suspension or from the fiber obtained after step (c).
  • the fibrous suspension as well as the fiber obtained from the process, can be used to manufacture paper or any other product of fibrous origin, such as packaging, hygienic mats, acoustic insulation, among others.
  • any paper product or any other product of fibrous origin can be produced, such as special paper, banknotes, passports and tax stamps, comprising among one of its constituents the fibrous suspension or fiber as obtained by the process of the present invention.
  • the present invention enables the circular economy of a product, waste from banknotes, which until now has not been possible to use for the production of the base product: paper.
  • the base product paper.
  • Example 1 Obtaining recycled special paper with fiber obtained from additional step (c) To obtain special recycled paper, the fiber obtained in step (c) undergoes a disintegration of the fibrous raw materials. That is, the material passes through a tank equipped with rotating blades that disintegrate the fed material. The process is carried out at a consistency (mass/mass concentration) of approximately 5%, that is, 5% consistency means that there is a ratio of 5 g of fibrous material (solid) to 100 g of water (liquid).
  • This disaggregated mass then passes through rotating blades that modify the fibers appropriately for paper production, with optional controls: inlet and outlet pressure at 2.5 to 4.0 Pa, electrical current of the equipment, which must be constant, and Schopper degree (°SR - unit of measurement referring to the degree of drainage of a fibrous suspension) according to the desired specification for the final paper.
  • This refined pulp goes to a tank where it receives additives such as dyes and bleaches, in continuous dosage such as glue, starch, retainers, coagulants, mineral filler, among others according to what is desired to be customized in the final product.
  • additives such as dyes and bleaches
  • continuous dosage such as glue, starch, retainers, coagulants, mineral filler, among others according to what is desired to be customized in the final product.
  • the refined pulp is purified to eliminate part of the impurities in various centrifugal purifiers and fed through a distributor to the inlet box of the paper machine and then goes to the tank that feeds the paper machine.
  • the headbox distributes this fibrous suspension through a dosing lip on the flat table (Fourdrinier) whose function is to form the paper by draining it onto a perforated plastic screen.
  • the continuous sheet of paper has a dry content of approximately 20%.
  • the sheet is then dried using steam-heated cylinders until the product reaches its final moisture content of approximately 5%.
  • the web may receive a surface bath treatment (usually a modified starch) to improvement of some paper properties in a dosing equipment called a glue press or size press.
  • a surface bath treatment usually a modified starch
  • the paper is dried again using steam-heated cylinders or infrared dryers.
  • Some papers also receive mechanical treatment using heated steel or rubber-coated calenders to improve the uniformity of the paper surface (smoothness, roughness), as well as to partially adjust the thickness of the product.
  • the paper is then rolled onto spools and removed from the paper machine.
  • jumbo rolls are destined for a finishing equipment called a rewinder where these rolls are wound under tension and cut to the required width into coils.
  • coils can then be packaged for their destination and sale or go through cutters where they are cut into sheets and then packaged for sale.

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Abstract

La présente invention trouve une application dans les domaines de la récupération ou de l'exploitation de matières résiduelles. La présente invention concerne un procédé de recyclage de billets de banque. Le procédé de production de billets de banque génère des résidus solides, tels que des rejets de papier dus à des problèmes de qualité et à des défauts d'impression, ce qui donne lieu à un gaspillage très important qu'il convient de gérer de façon appropriée. Dans ce contexte, afin de résoudre le problème susmentionné, la présente invention fournit un procédé de recyclage de papier-monnaie actuel, se basant sur sa composition. Ainsi, le recyclage de rebuts provenant du procédé de fabrication de billets de banque démontre la pertinence de l'économie circulaire et de l'utilisation responsable des ressources dans l'industrie de l'impression.
PCT/BR2024/050357 2023-11-27 2024-08-13 Procédé de recyclage de papier-monnaie ou de papier spécial, suspension fibreuse, fibre recyclée et utilisation de celles-ci et papier obtenu Pending WO2025111676A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR1020230248217 2023-11-27
BR102023024821-7A BR102023024821A2 (pt) 2023-11-27 Processo de reciclagem de papel moeda ou especial, suspensão fibrosa, fibra reciclada e uso das mesmas e papel obtido

Publications (1)

Publication Number Publication Date
WO2025111676A1 true WO2025111676A1 (fr) 2025-06-05

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Family Applications (1)

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PCT/BR2024/050357 Pending WO2025111676A1 (fr) 2023-11-27 2024-08-13 Procédé de recyclage de papier-monnaie ou de papier spécial, suspension fibreuse, fibre recyclée et utilisation de celles-ci et papier obtenu

Country Status (1)

Country Link
WO (1) WO2025111676A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9605508A (pt) * 1996-11-04 1998-08-11 Gatti Rodrigues Da Cos Hofmann Reciclagem de papel moeda com utilização de anti-resistência a úmido
CN1282819A (zh) * 1999-08-03 2001-02-07 张彦平 用废币纸屑生产包装箱的方法
CN104893241A (zh) * 2015-05-20 2015-09-09 福建瑞达精工股份有限公司 一种以废钞纸为基材的可降解塑料填料的制备方法
BR112014018860A2 (fr) * 2012-01-31 2017-06-20
BR102012010928A2 (pt) * 2012-05-09 2017-12-05 Francides Gomes Da Silva Junior processo de recuperação da polpa celulósica com valor economico oriunda de papéis fiduciários, moeda, de segurança e correlatos
BR112017020295A2 (pt) * 2015-03-23 2018-06-05 Oberthur Fiduciaire papel e documento protegido
CN110590962A (zh) * 2019-09-23 2019-12-20 陕西科技大学 一种以废钞为原料制备醋酸纤维素的方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9605508A (pt) * 1996-11-04 1998-08-11 Gatti Rodrigues Da Cos Hofmann Reciclagem de papel moeda com utilização de anti-resistência a úmido
CN1282819A (zh) * 1999-08-03 2001-02-07 张彦平 用废币纸屑生产包装箱的方法
BR112014018860A2 (fr) * 2012-01-31 2017-06-20
BR102012010928A2 (pt) * 2012-05-09 2017-12-05 Francides Gomes Da Silva Junior processo de recuperação da polpa celulósica com valor economico oriunda de papéis fiduciários, moeda, de segurança e correlatos
BR112017020295A2 (pt) * 2015-03-23 2018-06-05 Oberthur Fiduciaire papel e documento protegido
CN104893241A (zh) * 2015-05-20 2015-09-09 福建瑞达精工股份有限公司 一种以废钞纸为基材的可降解塑料填料的制备方法
CN110590962A (zh) * 2019-09-23 2019-12-20 陕西科技大学 一种以废钞为原料制备醋酸纤维素的方法

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