WO2020188306A1 - Method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and packaging material produced using the method - Google Patents

Method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and packaging material produced using the method Download PDF

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Publication number
WO2020188306A1
WO2020188306A1 PCT/HU2019/000013 HU2019000013W WO2020188306A1 WO 2020188306 A1 WO2020188306 A1 WO 2020188306A1 HU 2019000013 W HU2019000013 W HU 2019000013W WO 2020188306 A1 WO2020188306 A1 WO 2020188306A1
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WO
WIPO (PCT)
Prior art keywords
fibres
suspension
waste paper
paper
packaging material
Prior art date
Application number
PCT/HU2019/000013
Other languages
French (fr)
Inventor
Levente CSÓKA
Ottó KOLONICS
Gábor LÁSZLÓ
Original Assignee
Celltech-Paper Kft.
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Filing date
Publication date
Application filed by Celltech-Paper Kft. filed Critical Celltech-Paper Kft.
Publication of WO2020188306A1 publication Critical patent/WO2020188306A1/en

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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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • 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
    • 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
    • D21H27/10—Packing paper
    • 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 subject of the invention relates to a method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and to packaging material produced from waste paper that may be recycled with the method.
  • a significant processing step in the case of recycled paper-based packaging material is that the paper pulp is whitened, and, optionally, long plant-based fibres are added to the pulp in order to obtain recycled raw paper with the appropriate optical effect and strength.
  • the disadvantage of these procedural steps is, however, that they increase the production costs, and require the use of further natural materials, such as plant fibres, additionally it is necessary to add further chemical substances, which, during drying, remain as an undesirable side-product of the production processes, and these have to be disposed of.
  • cellulose-based manufacturing side-products exist, such as the raw paper waste from cutting out the shapes of moisture absorbing products, e.g. sanitary towels and nappies or diapers, and abrasive paper, the recycling of which has not been possible to date.
  • these materials predominantly cotton-based fibres, are coated with sizing materials that could not be removed from the fibres in the conventional paper industry processes. Therefore, the cellulose-based material that otherwise is of high purity and has a preferable white colour could not be transformed into a paper pulp state that could be reused.
  • the objective with the solution according to the invention was to create a method with which such sized waste materials, i.e. containing cellulose fibres surface-coated with wetstrengthening substances, can be made recyclable in a simple way at a preferable cost, and so create packaging materials with high quality characteristics.
  • the recognition also includes that if the suspension formed from the waste containing cellulose fibres coated with the wet-strengthening substance is conveyed to a suitably established cavitation grinding device and the desired physical and chemical releasing treatment is performed there.
  • the method according to the invention for recycling waste paper containing plant-based fibres and at least partially coated with a wetstrengthening material is based on the principle that the waste paper is conveyed to a wetting vessel and there, by adding a liquid, a maximum 5 mass% waste paper-liquid base suspension is formed, then the base suspension is transported into the reaction chamber of a cavitation grinding device, and there the coated fibres are at least partially subjected to a physical and chemical release treatment originating from the cavitation effect created by the cavitation grinding device, and so a treated suspension containing released fibres is produced, following this the treated suspension containing the released fibres is conveyed to the work space of a diluting bath, and there, by adding further liquid a diluted suspension is created that contains 0.5 to 1.2 mass% released fibres, subsequently the diluted suspension is transported to a paper industry forming device known of in itself, and there a semi-finished product for the production of packaging material or packaging material is created.
  • a further feature of the method according to the invention may be that before conveying the treated suspension to the work space of the diluting bath, it is returned once or several times repeatedly to the reaction chamber of the cavitation grinding device, and is only transported to the workspace of the diluting bath following further release treatments.
  • water is used as the liquid for the production of the waste paper liquid base suspension and/or of the diluted suspension.
  • the diluted suspension before conveying the diluted suspension to the paper industry forming device, the diluted suspension is subjected to further fine chopping.
  • the fine chopping is performed in a low, medium or high density pulper, or Hollander beater, or anti-caker, or a conical or disc grinder.
  • a vacuum shape press is used as the paper industry forming device.
  • the packaging material made from recyclable waste paper with the method according to the invention is produced in such a way that it contains at least 10 mass% of a component made from waste paper containing plant-based fibres that are at least partially coated with a wet-strengthening substance.
  • a further feature of the packaging material may be that at least a proportion of the waste paper containing plant-based fibres at least partially coated with a wet-strengthening substance is hygiene paper waste, such as, for example, nappy-diaper or sanitary towel raw material or used abrasive paper raw paper waste.
  • the method according to the invention has numerous preferable characteristics. The most important of these is that with its use excellent quality high-whiteness waste paper containing cellulose-based fibres becomes recyclable, the use of which was not possible to date.
  • a further advantage originating from this is not only that it becomes possible to use a material that to date had been incinerated or transported to landfill, and so the environmental load derived from the incineration of the waste paper or its disposal in landfill does not occur, the optical whiteness of the paper raw material made from such cotton-based fibres is excellent, and due to this the recycled material also makes it possible to produce packaging material of much better quality and with a much better visual effect.
  • Another feature that may be listed among the advantages is that in the course of the release treatment, as a result of the effect of the hydroxyl free radicals developing due to the cavitation it is not necessary to use further chemicals to separate and remove the sizing substances. This, on the one part, reduces the costs of the method, and, on the other part, reduces the degree of the environmental load occurring during the method.
  • Another feature that must be assessed as being an advantage is that due to that the waste paper created when producing hygiene paper products contains high quality and high- strength cotton fibres, less fibre-length-increasing additives, such as artificial fibres need to be mixed with the recycled raw material, with the cotton fibres freed of the sizing substances and once again separated into individual fibres, especially due to their length when used as vacuum shape pressed packaging material, which has a favourable influence on the price of the produced raw material, and due to the lower plastic content the environmental load is also reduced.
  • Another important advantage is that it is possible to produce high-purity, good quality, vacuum shape pressed products from the cellulose fibres freed of the sizing substances using known paper industry equipment and production processes.
  • Figure 1 depicts a schematic view of a version of the arrangement of the equipment that may be used for the implementation of the method.
  • Figure 1 shows a group of equipment suitable for implementing the method according to the invention.
  • the wetting vessel 1 may be seen, which serves for producing a base suspension“AS” consisting of waste paper“H” and liquid“F”.
  • the outlet la of the wetting vessel 1 here is connected to the inlet opening 2b of the cavitation grinding device 2 with the help of the feed pipe lb.
  • the inlet opening 2b is connected to the reaction chamber 2a of the cavitation grinding device 2.
  • the cavitation grinding device 2 also has an outlet opening 2c.
  • the treated suspension“KS” leaves the reaction chamber 2a of the cavitation grinding device 2 through the outlet opening 2c.
  • the outlet opening 2c of the cavitation grinding device 2 is connected to a transport pipe 6.
  • the transport pipe 6 has a multi-position valve 6a, with the help of which the treated suspension“KS” may be conveyed either into the work space 3 a of the diluting bath 3, or may be returned again into the reaction chamber 2a of the cavitation grinding device 2 through the recirculation line 6b for further release treatment.
  • the treated suspension“KS” and the liquid“F” added to it are located in the work space 3 a of the diluting bath 3.
  • the diluting bath 3 is connected to a chopping device 5, which chopping device 5 is connected to the paper industry forming device 4.
  • the multi-position valve 6a and the recirculation line 6b are not essential components of the set of equipment, just like the chopping device 5, which is interposed between the diluting bath 3 and the paper industry forming device 4. However, their use may improve the quality of the final product.
  • waste paper“H” was conveyed to the wetting vessel 1.
  • liquid“F” in the given method version clean water is added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 4 mass% waste paper liquid base suspension“AS” was produced.
  • the base suspension“AS” was stirred for a period of 10 minutes at environmental temperature and environmental pressure.
  • the 4 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe lb through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and there it was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure.
  • the treatment due to the effect of the explosions created by the micro-bubbles generated during cavitation and the hydroxyl radicals created as a consequence, and the movement and friction originating from the stirring, the wet-strengthening coating on the long cotton fibres of the waste paper “H” in the base suspension“AS” was separated, and in this way the cotton fibres were released.
  • the treated suspension“KS” was conveyed into the transport pipe 6 through the outlet opening 2c of the cavitation grinding device 2, and with the help of the multi-position valve 6a it was fed back once again to the reaction chamber 2a of the cavitation grinding device 2 through the recirculation line 6b.
  • the treated suspension“KS” was recirculated five times into the cavitation grinding device 2, then after these five recirculation processes the treated suspension“KS” was conveyed into the work space 3 a of the diluting bath 3 through the transport pipe 6 using the second position of the multi-position valve 6a.
  • a diluted suspension“HS” was created containing 1 mass% released cotton fibres and liquid.
  • the diluted suspension“HS” was subjected to continuous stirring in the work space 3a or the diluting bath 3 at environmental temperature and pressure. Following this the diluted suspension“HS” was conveyed into the chopping device 5, a Hollander beater in this case, where fine chopping was performed for a period of 20 minutes at environmental temperature and pressure.
  • At least 90 mass% of the egg trays produced with the given method version were made from waste paper containing plant-based fibres at least partially coated with wetstrengthening substance.
  • waste paper“H” In the given method version cutting waste created during the production of moisture absorbent sanitary towels was processed and from this raw packaging material paper was produced.
  • waste paper“H” In the course of the method first of all high cotton content cutting waste, as waste paper“H”, along with further mixed paper waste was placed in the wetting vessel 1.
  • liquid“F”, in the given method version clean water was added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 3 mass% waste paper liquid base suspension“AS” was produced.
  • the base suspension“AS” was stirred for a period of 1 to 10 minutes, for a period of 8 minutes in the present case at environmental temperature and environmental pressure.
  • the 3 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe 1b through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure for a period of 30 seconds.
  • the wet-strengthening coating on the long cotton fibres was separated, and in this way the cotton fibres were released to create treated suspension“KS”.
  • the treated suspension“KS” was transported to the work space 3a of the diluting bath 3 through the transport pipe 6, where by adding further liquid“F” diluted suspension“HS” containing 0.6 mass% release cotton fibres, other cellulose fibres and liquid was created.
  • the packaging paper raw material in the roll consisted of at least 10 mass % waste paper containing plant-based fibres at least partially coated with wet-strengthening substance.
  • abrasive paper base paper was processed and raw packaging material paper was produced from it.
  • the used abrasive paper as waste paper“H”, along with further mixed paper waste was placed in the wetting vessel 1.
  • liquid“F” in the given method version clean water was added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 5 mass% waste paper liquid base suspension“AS” was produced.
  • the base suspension“AS” was stirred for a period of 5 to 15 minutes, for a period of 12 minutes in the present case at environmental temperature and environmental pressure.
  • the 5 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe lb through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure for a period of 30 seconds.
  • the wet-strengthening coating on the long cotton fibres was separated, and in this way the cotton fibres were released to create treated suspension“KS”.
  • the treated suspension“KS” was conveyed into the transport pipe 6 through the outlet opening 2c of the cavitation grinding device 2, and with the help of the multi-position valve 6a, it was returned into the reaction chamber 2a of the cavitation grinding device 2 once again through the recirculation line 6b.
  • the treated suspension“KS” was recirculated into the cavitation grinding device 2 five times.
  • the packaging paper raw material in the roll consisted of at least 10 mass % waste paper containing plant-based fibres at least partially coated with wet-strengthening substance.
  • the method according to the invention may be used to good effect in all cases where paper waste containing plant-based fibres at least partially coated with wet-strengthening substance needs to be processed into recycled packaging paper raw material or packaging material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The object of the invention is a method for recycling waste paper containing plant-based fibres at least partially coated with a wet-strengthening material. The characteristic feature of the invention is that the waste paper (H) is conveyed to a wetting vessel (1) and there, by adding a liquid (F), a maximum 5 mass% waste paper- liquid base suspension (AS) is formed, then the base suspension (AS) is transported into the reaction chamber (2a) of a cavitation grinding device (2), and there the coated fibres are at least partially subjected to a physical and chemical release treatment originating from the cavitation effect created by the cavitation grinding device (2), and so a treated suspension (KS) containing released fibres is produced, following this the treated suspension (KS) containing the released fibres is conveyed to the work space (3 a) of a diluting bath (3), and there, by adding further liquid (F) a diluted suspension (HS) is created that contains 0.5 to 1.2 mass% released fibres, subsequently the diluted suspension (HS) is transported to a paper industry forming device (4) known of in itself, and there a semi-finished product for the production of packaging material or packaging material is created. The object of the invention is a packaging material made from recyclable waste paper which contains at least 10 mass% of a component made from waste paper containing plant- based fibres that are at least partially coated with a wet-strengthening substance, and made by the present method.

Description

Method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and packaging material produced using the method
The subject of the invention relates to a method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and to packaging material produced from waste paper that may be recycled with the method.
In recent years at least a proportion of used, worn out components are recycled in the interest of reducing environmental load and better use of natural resources. The same is also true for various cellulose-based products, packaging material and other paper goods. The given paper material to be recycled is moistened, subjected to various chemical treatments, and following this boards or rolls are made from the paper pulp obtained through this, which are used for the production of new paper products, primarily packaging materials. Such solutions may be found, among others, in publication documents number CN 108425259 and number CN 108603342, and in patent specification registration number RU 2676489 also.
A significant processing step in the case of recycled paper-based packaging material is that the paper pulp is whitened, and, optionally, long plant-based fibres are added to the pulp in order to obtain recycled raw paper with the appropriate optical effect and strength. The disadvantage of these procedural steps is, however, that they increase the production costs, and require the use of further natural materials, such as plant fibres, additionally it is necessary to add further chemical substances, which, during drying, remain as an undesirable side-product of the production processes, and these have to be disposed of.
In addition to the above, cellulose-based manufacturing side-products exist, such as the raw paper waste from cutting out the shapes of moisture absorbing products, e.g. sanitary towels and nappies or diapers, and abrasive paper, the recycling of which has not been possible to date. The basis of the problem derives from that these materials, predominantly cotton-based fibres, are coated with sizing materials that could not be removed from the fibres in the conventional paper industry processes. Therefore, the cellulose-based material that otherwise is of high purity and has a preferable white colour could not be transformed into a paper pulp state that could be reused.
The objective with the solution according to the invention was to create a method with which such sized waste materials, i.e. containing cellulose fibres surface-coated with wetstrengthening substances, can be made recyclable in a simple way at a preferable cost, and so create packaging materials with high quality characteristics.
The recognition that led to the method according to the invention was that if a suspension is formed from the waste containing cellulose fibres coated with a wetstrengthening substance by adding a liquid, and if this suspension is subjected to a cavitation effect, then as a result of the physical and chemical reactions occurring during this cavitation, the sizing substances become fragmented due to the micro-explosions formed during cavitation, and they are dissolved off the surface of the cellulose fibres due to the created hydroxyl radicals, and in this way the“released” cellulose fibres become suitable for recycling with the use of conventional paper industry processes.
The recognition also includes that if the suspension formed from the waste containing cellulose fibres coated with the wet-strengthening substance is conveyed to a suitably established cavitation grinding device and the desired physical and chemical releasing treatment is performed there.
In accordance with the set objective, the method according to the invention for recycling waste paper containing plant-based fibres and at least partially coated with a wetstrengthening material is based on the principle that the waste paper is conveyed to a wetting vessel and there, by adding a liquid, a maximum 5 mass% waste paper-liquid base suspension is formed, then the base suspension is transported into the reaction chamber of a cavitation grinding device, and there the coated fibres are at least partially subjected to a physical and chemical release treatment originating from the cavitation effect created by the cavitation grinding device, and so a treated suspension containing released fibres is produced, following this the treated suspension containing the released fibres is conveyed to the work space of a diluting bath, and there, by adding further liquid a diluted suspension is created that contains 0.5 to 1.2 mass% released fibres, subsequently the diluted suspension is transported to a paper industry forming device known of in itself, and there a semi-finished product for the production of packaging material or packaging material is created.
A further feature of the method according to the invention may be that before conveying the treated suspension to the work space of the diluting bath, it is returned once or several times repeatedly to the reaction chamber of the cavitation grinding device, and is only transported to the workspace of the diluting bath following further release treatments.
In the case of a different embodiment of the method, water is used as the liquid for the production of the waste paper liquid base suspension and/or of the diluted suspension.
In the case of yet another different version of the method according to the invention, before conveying the diluted suspension to the paper industry forming device, the diluted suspension is subjected to further fine chopping. The fine chopping is performed in a low, medium or high density pulper, or Hollander beater, or anti-caker, or a conical or disc grinder.
In the case of another embodiment of the method, a vacuum shape press is used as the paper industry forming device.
The packaging material made from recyclable waste paper with the method according to the invention is produced in such a way that it contains at least 10 mass% of a component made from waste paper containing plant-based fibres that are at least partially coated with a wet-strengthening substance.
A further feature of the packaging material may be that at least a proportion of the waste paper containing plant-based fibres at least partially coated with a wet-strengthening substance is hygiene paper waste, such as, for example, nappy-diaper or sanitary towel raw material or used abrasive paper raw paper waste.
The method according to the invention has numerous preferable characteristics. The most important of these is that with its use excellent quality high-whiteness waste paper containing cellulose-based fibres becomes recyclable, the use of which was not possible to date. A further advantage originating from this is not only that it becomes possible to use a material that to date had been incinerated or transported to landfill, and so the environmental load derived from the incineration of the waste paper or its disposal in landfill does not occur, the optical whiteness of the paper raw material made from such cotton-based fibres is excellent, and due to this the recycled material also makes it possible to produce packaging material of much better quality and with a much better visual effect.
Another feature that may be listed among the advantages is that in the course of the release treatment, as a result of the effect of the hydroxyl free radicals developing due to the cavitation it is not necessary to use further chemicals to separate and remove the sizing substances. This, on the one part, reduces the costs of the method, and, on the other part, reduces the degree of the environmental load occurring during the method.
Another feature that must be assessed as being an advantage is that due to that the waste paper created when producing hygiene paper products contains high quality and high- strength cotton fibres, less fibre-length-increasing additives, such as artificial fibres need to be mixed with the recycled raw material, with the cotton fibres freed of the sizing substances and once again separated into individual fibres, especially due to their length when used as vacuum shape pressed packaging material, which has a favourable influence on the price of the produced raw material, and due to the lower plastic content the environmental load is also reduced.
Another important advantage is that it is possible to produce high-purity, good quality, vacuum shape pressed products from the cellulose fibres freed of the sizing substances using known paper industry equipment and production processes.
The method according to the invention is presented in the following in detail in connection with a drawing showing the arrangement, in connection with an example. In the drawing
Figure 1 depicts a schematic view of a version of the arrangement of the equipment that may be used for the implementation of the method. Figure 1 shows a group of equipment suitable for implementing the method according to the invention. The wetting vessel 1 may be seen, which serves for producing a base suspension“AS” consisting of waste paper“H” and liquid“F”. The outlet la of the wetting vessel 1 here is connected to the inlet opening 2b of the cavitation grinding device 2 with the help of the feed pipe lb. The inlet opening 2b is connected to the reaction chamber 2a of the cavitation grinding device 2. The cavitation grinding device 2 also has an outlet opening 2c. The treated suspension“KS” leaves the reaction chamber 2a of the cavitation grinding device 2 through the outlet opening 2c.
The outlet opening 2c of the cavitation grinding device 2 is connected to a transport pipe 6. The transport pipe 6 has a multi-position valve 6a, with the help of which the treated suspension“KS” may be conveyed either into the work space 3 a of the diluting bath 3, or may be returned again into the reaction chamber 2a of the cavitation grinding device 2 through the recirculation line 6b for further release treatment.
The treated suspension“KS” and the liquid“F” added to it are located in the work space 3 a of the diluting bath 3. In the case of the given embodiment the diluting bath 3 is connected to a chopping device 5, which chopping device 5 is connected to the paper industry forming device 4.
It should be noted here that the multi-position valve 6a and the recirculation line 6b are not essential components of the set of equipment, just like the chopping device 5, which is interposed between the diluting bath 3 and the paper industry forming device 4. However, their use may improve the quality of the final product.
In the following the method according to the invention is presented in detail in connection with examples.
Example 1 :
In the given method version cutting waste created during nappy-diaper production was processed and shape-pressed/vacuum shaped white egg tray packaging material was made from it. In the course of the method first of all high cotton content cutting waste, such as waste paper“H” was conveyed to the wetting vessel 1. Furthermore, liquid“F”, in the given method version clean water is added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 4 mass% waste paper liquid base suspension“AS” was produced. The base suspension“AS” was stirred for a period of 10 minutes at environmental temperature and environmental pressure.
Subsequently the 4 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe lb through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and there it was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure. During the treatment, due to the effect of the explosions created by the micro-bubbles generated during cavitation and the hydroxyl radicals created as a consequence, and the movement and friction originating from the stirring, the wet-strengthening coating on the long cotton fibres of the waste paper “H” in the base suspension“AS” was separated, and in this way the cotton fibres were released.
In the interest of completely separating the wet-strengthening coating from the surface of the cotton fibres, the treated suspension“KS” was conveyed into the transport pipe 6 through the outlet opening 2c of the cavitation grinding device 2, and with the help of the multi-position valve 6a it was fed back once again to the reaction chamber 2a of the cavitation grinding device 2 through the recirculation line 6b.
In the given example the treated suspension“KS” was recirculated five times into the cavitation grinding device 2, then after these five recirculation processes the treated suspension“KS” was conveyed into the work space 3 a of the diluting bath 3 through the transport pipe 6 using the second position of the multi-position valve 6a. By adding more liquid“F”, water in this case, to the treated suspension“KS” conveyed into the work space 3a of the diluting bath 3, a diluted suspension“HS” was created containing 1 mass% released cotton fibres and liquid.
The diluted suspension“HS” was subjected to continuous stirring in the work space 3a or the diluting bath 3 at environmental temperature and pressure. Following this the diluted suspension“HS” was conveyed into the chopping device 5, a Hollander beater in this case, where fine chopping was performed for a period of 20 minutes at environmental temperature and pressure.
Finally the diluted suspension“HS” subjected to fine chopping was conveyed into the paper industry forming device 4, a vacuum shape press in the present case, known of in itself, where egg trays were produced using a production technology procedure also known of in itself.
At least 90 mass% of the egg trays produced with the given method version were made from waste paper containing plant-based fibres at least partially coated with wetstrengthening substance.
Example 2:
In the given method version cutting waste created during the production of moisture absorbent sanitary towels was processed and from this raw packaging material paper was produced. In the course of the method first of all high cotton content cutting waste, as waste paper“H”, along with further mixed paper waste was placed in the wetting vessel 1. Furthermore, liquid“F”, in the given method version clean water was added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 3 mass% waste paper liquid base suspension“AS” was produced. The base suspension“AS” was stirred for a period of 1 to 10 minutes, for a period of 8 minutes in the present case at environmental temperature and environmental pressure.
Following this, the 3 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe 1b through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure for a period of 30 seconds. During the treatment, the wet-strengthening coating on the long cotton fibres was separated, and in this way the cotton fibres were released to create treated suspension“KS”.
The treated suspension“KS” was transported to the work space 3a of the diluting bath 3 through the transport pipe 6, where by adding further liquid“F” diluted suspension“HS” containing 0.6 mass% release cotton fibres, other cellulose fibres and liquid was created.
Following this the diluted suspension“HS” was conveyed directly into the paper industry forming device 4, where following drying known of in itself a roll of packaging paper raw material was formed. The packaging paper raw material in the roll consisted of at least 10 mass % waste paper containing plant-based fibres at least partially coated with wet-strengthening substance.
Example 3:
In the given method version used abrasive paper base paper was processed and raw packaging material paper was produced from it. In the course of the method the used abrasive paper, as waste paper“H”, along with further mixed paper waste was placed in the wetting vessel 1. Furthermore, liquid“F", in the given method version clean water was added to the wetting vessel 1 in addition to the waste paper“H”, preferably while stirring, and in this way 5 mass% waste paper liquid base suspension“AS” was produced. The base suspension“AS” was stirred for a period of 5 to 15 minutes, for a period of 12 minutes in the present case at environmental temperature and environmental pressure.
Following this, the 5 mass% base suspension“AS” was conveyed through the outlet la of the wetting vessel 1 with the help of the feed pipe lb through the inlet opening 2b of the cavitation grinding device 2 into the reaction chamber 2a of the cavitation grinding device 2, and was subjected to the chemical and physical treatment created by the cavitation at environmental temperature and pressure for a period of 30 seconds. During the treatment, the wet-strengthening coating on the long cotton fibres was separated, and in this way the cotton fibres were released to create treated suspension“KS”.
In the interest of completely removing the wet-strengthening coating from the entire surface of the fibres forming the abrasive paper the treated suspension“KS” was conveyed into the transport pipe 6 through the outlet opening 2c of the cavitation grinding device 2, and with the help of the multi-position valve 6a, it was returned into the reaction chamber 2a of the cavitation grinding device 2 once again through the recirculation line 6b. In the case of the given method version the treated suspension“KS” was recirculated into the cavitation grinding device 2 five times.
Following this the treated suspension“KS” was transported to the work space 3a of the diluting bath 3 with the multi-position valve in a different position, where by adding further liquid“F” a diluted suspension“HS” containing 0.9 mass% released plant fibres, other cellulose fibres and liquid was created.
Following this the diluted suspension“HS” was conveyed directly into the paper industry forming device 4, where following drying known of in itself a roll of packaging paper raw material was formed. The packaging paper raw material in the roll consisted of at least 10 mass % waste paper containing plant-based fibres at least partially coated with wet-strengthening substance.
The method according to the invention may be used to good effect in all cases where paper waste containing plant-based fibres at least partially coated with wet-strengthening substance needs to be processed into recycled packaging paper raw material or packaging material.
LIST OF REFERENCES
1 wetting vessel 1a kimenet
1b feed pipe
2 cavitation grinding device 2a reaction chamber
2b inlet opening 2c outlet opening
3 diluting bath 3a work space
4 paper industry forming device
5 chopping device
6 transport pipe 6a multi-position valve
6b visszaforgato vezetek
„AS” base suspension
„F” liquid
„H” waste paper
„HS” diluted suspension
„KS” treated suspension

Claims

1. Method for recycling waste paper containing plant-based fibres at least partially coated with a wet-strengthening material, characterised by that the waste paper (H) is conveyed to a wetting vessel (1) and there, by adding a liquid (F), a maximum 5 mass% waste paper-liquid base suspension (AS) is formed, then the base suspension (AS) is transported into the reaction chamber (2a) of a cavitation grinding device (2), and there the coated fibres are at least partially subjected to a physical and chemical release treatment originating from the cavitation effect created by the cavitation grinding device (2), and so a treated suspension (KS) containing released fibres is produced, following this the treated suspension (KS) containing the released fibres is conveyed to the work space (3 a) of a diluting bath (3), and there, by adding further liquid (F) a diluted suspension (HS) is created that contains 0.5 to 1.2 mass% released fibres, subsequently the diluted suspension (HS) is transported to a paper industry forming device (4) known of in itself, and there a semi-finished product for the production of packaging material or packaging material is created.
2. Method according to claim 1, characterised by that before conveying the treated suspension to the work space (3a) of the diluting bath (3), it is returned once or several times repeatedly to the reaction chamber (2a) of the cavitation grinding device (2), and is only transported to the workspace (3a) of the diluting bath (3) following further release treatments.
3. Method according to claim 1 or 2, characterised by that water is used as the liquid (F) for the production of the waste paper liquid base suspension (AS) and/or of the diluted suspension (HS).
4. Method according to any of claims 1 to 3, characterised by that before conveying the diluted suspension (HS) to the paper industry forming device (4), the diluted suspension (HS) is subjected to further fine chopping.
5. Method according to claim 4, characterised by that the fine chopping is performed in a low, medium or high density pulper, or Hollander beater, or anti-caker, or a conical or disc grinder.
6. Method according to any of claims 1 to 5, characterised by that a vacuum shape press is used as the paper industry forming device (4).
7. Packaging material made from recyclable waste paper with the method according to claim 1, characterised by that it contains at least 10 mass% of a component made from waste paper containing plant-based fibres that are at least partially coated with a wetstrengthening substance.
8. Packaging material according to claim 7, characterised by that at least a proportion of the waste paper containing plant-based fibres at least partially coated with a wetstrengthening substance is hygiene paper waste, such as, for example, nappy-diaper or sanitary towel raw material.
9. Packaging material according to claim 7, characterised by that at least a proportion of the waste paper containing plant-based fibres at least partially coated with a wetstrengthening substance is used abrasive paper raw paper waste.
PCT/HU2019/000013 2019-03-20 2019-05-15 Method for recycling waste paper containing plant-based fibres and at least partially coated with a wet-strengthening material, and packaging material produced using the method WO2020188306A1 (en)

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HU1900083A HU231176B1 (en) 2019-03-20 2019-03-20 Process for the recycling of waste paper containing cotton fibers at least partially coated with a wet curing material in the manufacture of absorbent pads, and packaging material made from waste paper recyclable by the process
HUHUP1900083 2019-03-20

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