WO1996019284A1 - Paper recycling - Google Patents
Paper recycling Download PDFInfo
- Publication number
- WO1996019284A1 WO1996019284A1 PCT/GB1995/002984 GB9502984W WO9619284A1 WO 1996019284 A1 WO1996019284 A1 WO 1996019284A1 GB 9502984 W GB9502984 W GB 9502984W WO 9619284 A1 WO9619284 A1 WO 9619284A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pelletiser
- crumb
- fibre
- pellets
- range
- Prior art date
Links
- 238000004064 recycling Methods 0.000 title abstract description 4
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 238000004537 pulping Methods 0.000 claims abstract description 10
- 239000010893 paper waste Substances 0.000 claims abstract description 5
- 238000010924 continuous production Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 34
- 239000008188 pellet Substances 0.000 claims description 32
- 238000005453 pelletization Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
- 235000015097 nutrients Nutrition 0.000 description 8
- 239000002361 compost Substances 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000003516 soil conditioner Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- -1 greases Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/015—Floor coverings, e.g. bedding-down sheets ; Stable floors
- A01K1/0152—Litter
- A01K1/0155—Litter comprising organic material
Definitions
- This invention relates to paper recycling, in particular to the preparation of an aqueous pulp; to the preparation of pellets from an aqueous pulp; to pulp and pellets thus formed; and to end uses of the pulp and the pellets thus formed.
- the invention relates to a process for the preparation of a pulp from paper, for example waste paper.
- the paper is torn or cut into small pieces before pulping.
- a preferred method is to shred the paper into strips. Particularly good results have been obtained with paper shredded into strips which are 3-6mm wide.
- the lime content by weight, based on weight of water may suitably be 2-10%, for example 4-6%.
- the pulping itself may be in a standard pulper.
- At the end of this pulping process there is preferably a step of de-watering, to a consistency in the range 20-70%, preferably 35-55%, most preferably 45- 50%.
- De-watering may employ standard equipment, for example a screw auger or a belt press. The result is suitably a fibre crumb.
- the process of this first aspect of the present invention preferably takes place at ambient temperature.
- a second aspect of the invention relates to a process for the formation of a fibre crumb into pellets.
- the fibre crumb may be prepared by the process described above in relation to the first aspect of the present invention, but it should be noted that the second aspect of the present invention may be used with a fibre crumb made by other methods, for example standard pulping methods already known.
- This second aspect of the present invention employs a rotary pelletiser in the form of a drum or barrel.
- the rotary pelletiser is of such a size that the fibre crumb introduced into it is subjected to a rolling and/or tumbling action.
- the fibre crumb can be loaded into the pelletiser, and rolled and/or tumbled to form pellets, without any intermediate stage of granulation.
- a granulation step is employed, using, for example, a commercially available granulator.
- the pelletiser has an internal surface which is not truly cylindrical, but which has raised parts and lower parts. This aids the rolling and/or tumbling action.
- the inside surface of the pelletiser is formed with a helical ridge from one end to the other, the ridge being generally cusp-shaped in cross section.
- the pelletiser rotates slowly, such that its circumferential speed is in the range 6-150 metres per minute, preferably 15-100 metres per minute, most preferably 40-60.
- the optimal circumferential speed found to date is 45-50 metres per minute.
- the residence time within the pelletiser is at least 5 minutes, but preferably less than 40 minutes; and most preferably about 6-15 minutes.
- a preferred capacity of the pelletiser is in the range 1-lOm 3 , preferably 5-8m 3 . It is preferred that the pelletiser is elongated, with its axial length exceeding its diameter. Preferably the ratio of the axial length to the diameter or mean diameter of the pelletiser is in the range 2-15:1, most preferably 3-8:1.
- such a pelletiser contains about 100- 1,000 Kg of paper material during pelletisation.
- the pelletisation step is part of a continuous process, with pellet formation occurring at a rate of 2-10 tonnes per hour.
- the pelletiser is set with its axis of rotation at a slight incline to the horizontal, for example 0.5-5°; preferably 1-2°.
- the fibre crumb is loaded into the pelletiser at its raised end. As the pelletiser rotates, and the fibre crumb is rolled and/or tumbled, it slowly moves towards the lower end of the pelletiser, where it is discharged. It will be appreciated that this arrangement is convenient and lends itself in particular to continuous processes.
- the process of formation of fibre crumb into pellets takes place at ambient temperature.
- the pellets formed in this pelletisation process may be suitable for certain end uses without further treatment. However, for most end uses it is necessary to remove water from them, and this may be carried out with standard drying equipment, for example equipment used in agriculture for grain drying. In certain embodiments it may be desirable to pass the paper pellets through magnetic screening equipment to remove ferrous objects.
- One end use for fibre crumb formed by the process of the first aspect of the present invention is in the preparation of briquettes for burning.
- the fibre crumb is readily mouldable and can be pressed to shape as water is being squeezed from it, and then dried thoroughly, to provide a relatively slow-burning briquette.
- the fibre crumb which is the product of the process of the first aspect of the present invention may have various uses which do not require it to be pelletised.
- One example relates to growing media.
- the fibre crumb may be a base medium, to which other materials such as peat, manure, fertiliser, sand, colourant etc. may be added. These further materials may be added in proportions suitable for producing growing media, for example seed compost, potting compost, bulb compost etc.
- the material may be used as a soil conditioner, to be added to soil or compost, to improve aeration, and/or to introduce lime or nutrients.
- Growing media employing fibre crumb prepared by the process of the first aspect of the present invention constitutes a further aspect of the present invention.
- pellets may advantageously employ pellets.
- the additional materials mentioned above may be employed, or incorporated in them as a result of the pelletisation processing.
- a fertiliser in liquid form to the crumb to be pelletised, so that nutrients soak into the pellets, as they form during tumbling.
- the pellets may often tend to be spherical in shape, and it will be appreciated that such pellets containing nutrients may offer quick release of nutrients initially. This may be very good for early growth of, for example, seedlings. As time goes on the nutrient release will tend to decrease, but will persist, providing slow release, for some considerable time.
- nutrients may be introduced onto pellets, for example by spraying, to provide quick nutrient release only.
- pellets may be used as a soil conditioner to be added to soil or compost, to improve aeration, and/or to introduce lime or nutrients.
- a growing medium employing paper pellets formed by the aspect of the present invention constitutes a further aspect of the present invention.
- pellets formed by the process of the second aspect of the present invention may have many further uses.
- dried pellets may be used as insulation for loft spaces and cavities of cavity walls; or may be used as a pet litter. These also constitute further aspects of the present invention.
- Waste paper for example newspaper, periodicals and magazines is sorted, paper binding is removed, and the paper is loaded onto a conveyor, then through a shredder which shreds the paper into long strips 5mm in width. It is then delivered by a conveyor to a standard paper pulper, able to produce approximately 5 tonnes of pulp per hour.
- the paper is mixed with lime water, to a consistency of 4-12%. The concentration of the lime in the water is about 5 weight percent.
- the pulp is discharged into de-watering equipment, for example a screw auger or belt press, where the pulp is de-watered into a fibre crumb, of consistency 35-55%. It should be noted that the fibre crumb may now be taken out, for use, for example, in making growing bags, compost, or burnable briquettes.
- the fibre crumb is discharged to an agricultural granulator, where it is granulated into granules of about 1-lOmm diameter, as required.
- the granulated fibre crumb is discharged into the rotary pelletiser of figure 1.
- This comprises a cylindrical drum of about 5m in length, and l in diameter, set at an angle to the horizontal. In this embodiment the angle is 1.5 degrees.
- the granulated fibre crumb is loaded continuously into the open end A, which is the raised end.
- the drum rotates at about 15 rpm, in this embodiment, so giving a circumferential speed of about 47 metres per minute. This speed is chosen so that the residence time of the paper material in the drum is about 10 minutes.
- the product which emerges from the lower open end B is no longer a granulated crumb but discrete regular pellets.
- the internal surface of the drum has a shallow helical ridge C from one end to the other, the shape of the ridge being cusp-shaped in cross section. This is thought to aid the pelletisation and help to prevent the crumb from forming into one solid mass.
- the pellets are dried in a agricultural dryer normally used for drying grain. This is very suitable for this purpose and is able to dry the pellets to a very low residual water content if required, for example a water content of about 5% by weight. Magnetic objects are then removed by passing the dried pellets through a magnetic screening station.
- pellets are then graded, for example by using standard grading equipment employing vibrating screens. Certain pellets which are too large or too small for any application may be re-cycled, for example by re- pulping them.
- the dried paper pellets are bagged up, for use as insulation materials for roof spaces and wall cavities, or as cat litter, or as absorbent pellets for absorbing spillages, for example of oils, greases, chemicals etc.
- Additives may be incorporated, for example flame retardant(s) , for insulation materials, and deodoriser(s) , for cat litter.
- Such additives may be introduced prior to pelletisation, for example by addition to the fibre crumb, or after pelletisation, for example by spraying onto the pellets, after or, preferably before the drying stage.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Environmental Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Housing For Livestock And Birds (AREA)
Abstract
An effective continuous process for recycling paper involves subjecting a fibre crumb (prepared by aqueous pulping of waste paper pieces and de-watering) to a rolling or tumbling action in an elongate barrel slightly inclined to the horizontal and having an internal helical ridge (C). The resultant product is pelletised paper which may be used inter alia as pet litter.
Description
PAPER RECYCLING
This invention relates to paper recycling, in particular to the preparation of an aqueous pulp; to the preparation of pellets from an aqueous pulp; to pulp and pellets thus formed; and to end uses of the pulp and the pellets thus formed.
In the first aspect the invention relates to a process for the preparation of a pulp from paper, for example waste paper. The paper is torn or cut into small pieces before pulping. A preferred method is to shred the paper into strips. Particularly good results have been obtained with paper shredded into strips which are 3-6mm wide.
Additionally it may be advantageous to carry out this pulping in an alkaline environment, for example in lime water. The lime content by weight, based on weight of water, may suitably be 2-10%, for example 4-6%. During this pulping process the consistency, that is to say, the proportion by weight of paper present, is in the range 2- 20%, preferably 4-12%. The pulping itself may be in a standard pulper. At the end of this pulping process there is preferably a step of de-watering, to a consistency in the range 20-70%, preferably 35-55%, most preferably 45- 50%. De-watering may employ standard equipment, for example a screw auger or a belt press. The result is suitably a fibre crumb.
The process of this first aspect of the present invention preferably takes place at ambient temperature.
A second aspect of the invention relates to a process for the formation of a fibre crumb into pellets. The
fibre crumb may be prepared by the process described above in relation to the first aspect of the present invention, but it should be noted that the second aspect of the present invention may be used with a fibre crumb made by other methods, for example standard pulping methods already known. This second aspect of the present invention employs a rotary pelletiser in the form of a drum or barrel. Suitably, the rotary pelletiser is of such a size that the fibre crumb introduced into it is subjected to a rolling and/or tumbling action. It has been found in certain embodiments requiring large pellets that the fibre crumb can be loaded into the pelletiser, and rolled and/or tumbled to form pellets, without any intermediate stage of granulation. In other embodiments a granulation step is employed, using, for example, a commercially available granulator.
Preferably, the pelletiser has an internal surface which is not truly cylindrical, but which has raised parts and lower parts. This aids the rolling and/or tumbling action. For example, in one preferred embodiment the inside surface of the pelletiser is formed with a helical ridge from one end to the other, the ridge being generally cusp-shaped in cross section.
Suitably, the pelletiser rotates slowly, such that its circumferential speed is in the range 6-150 metres per minute, preferably 15-100 metres per minute, most preferably 40-60. The optimal circumferential speed found to date is 45-50 metres per minute.
It has been found desirable for the residence time within the pelletiser to be at least 5 minutes, but preferably less than 40 minutes; and most preferably about 6-15 minutes.
A preferred capacity of the pelletiser is in the range 1-lOm3, preferably 5-8m3. It is preferred that the pelletiser is elongated, with its axial length exceeding its diameter. Preferably the ratio of the axial length to the diameter or mean diameter of the pelletiser is in the range 2-15:1, most preferably 3-8:1.
Preferably, such a pelletiser contains about 100- 1,000 Kg of paper material during pelletisation.
Suitably, the pelletisation step is part of a continuous process, with pellet formation occurring at a rate of 2-10 tonnes per hour.
Suitably, the pelletiser is set with its axis of rotation at a slight incline to the horizontal, for example 0.5-5°; preferably 1-2°. The fibre crumb is loaded into the pelletiser at its raised end. As the pelletiser rotates, and the fibre crumb is rolled and/or tumbled, it slowly moves towards the lower end of the pelletiser, where it is discharged. It will be appreciated that this arrangement is convenient and lends itself in particular to continuous processes.
Preferably, the process of formation of fibre crumb into pellets takes place at ambient temperature.
The pellets formed in this pelletisation process may be suitable for certain end uses without further treatment. However, for most end uses it is necessary to remove water from them, and this may be carried out with standard drying equipment, for example equipment used in agriculture for grain drying.
In certain embodiments it may be desirable to pass the paper pellets through magnetic screening equipment to remove ferrous objects.
Certain end uses of the products of the two processes defined and described above shall now be described. These products, certain modified products described below, and end uses, all constitute further aspects of the present invention.
One end use for fibre crumb formed by the process of the first aspect of the present invention is in the preparation of briquettes for burning. The fibre crumb is readily mouldable and can be pressed to shape as water is being squeezed from it, and then dried thoroughly, to provide a relatively slow-burning briquette.
The fibre crumb which is the product of the process of the first aspect of the present invention may have various uses which do not require it to be pelletised. One example relates to growing media. The fibre crumb may be a base medium, to which other materials such as peat, manure, fertiliser, sand, colourant etc. may be added. These further materials may be added in proportions suitable for producing growing media, for example seed compost, potting compost, bulb compost etc. Alternatively the material may be used as a soil conditioner, to be added to soil or compost, to improve aeration, and/or to introduce lime or nutrients. Growing media employing fibre crumb prepared by the process of the first aspect of the present invention constitutes a further aspect of the present invention.
Other growing media may advantageously employ pellets. The additional materials mentioned above may be
employed, or incorporated in them as a result of the pelletisation processing. In particular it may be advantageous to add a fertiliser in liquid form to the crumb to be pelletised, so that nutrients soak into the pellets, as they form during tumbling. The pellets may often tend to be spherical in shape, and it will be appreciated that such pellets containing nutrients may offer quick release of nutrients initially. This may be very good for early growth of, for example, seedlings. As time goes on the nutrient release will tend to decrease, but will persist, providing slow release, for some considerable time. In alternative embodiments nutrients may be introduced onto pellets, for example by spraying, to provide quick nutrient release only. Additionally, pellets may be used as a soil conditioner to be added to soil or compost, to improve aeration, and/or to introduce lime or nutrients. A growing medium employing paper pellets formed by the aspect of the present invention constitutes a further aspect of the present invention.
The pellets formed by the process of the second aspect of the present invention may have many further uses. For example, dried pellets may be used as insulation for loft spaces and cavities of cavity walls; or may be used as a pet litter. These also constitute further aspects of the present invention.
The invention will now be further described, by way of example, with reference to a paper pelletisation process which employs both the first and the second aspect of the present invention, with a second aspect involving the use of a pelletiser schematically shown in figure l.
The process of this example is as follows:
i. Waste paper, for example newspaper, periodicals and magazines is sorted, paper binding is removed, and the paper is loaded onto a conveyor, then through a shredder which shreds the paper into long strips 5mm in width. It is then delivered by a conveyor to a standard paper pulper, able to produce approximately 5 tonnes of pulp per hour. In the pulper, the paper is mixed with lime water, to a consistency of 4-12%. The concentration of the lime in the water is about 5 weight percent.
ii. The pulp is discharged into de-watering equipment, for example a screw auger or belt press, where the pulp is de-watered into a fibre crumb, of consistency 35-55%. It should be noted that the fibre crumb may now be taken out, for use, for example, in making growing bags, compost, or burnable briquettes.
iii. In this embodiment, the fibre crumb is discharged to an agricultural granulator, where it is granulated into granules of about 1-lOmm diameter, as required.
iv. The granulated fibre crumb is discharged into the rotary pelletiser of figure 1. This comprises a cylindrical drum of about 5m in length, and l in diameter, set at an angle to the horizontal. In this embodiment the angle is 1.5 degrees. The granulated fibre crumb is loaded continuously into the open end A, which is the raised end. The drum rotates at about 15 rpm, in this embodiment, so giving a circumferential speed of about 47 metres per minute. This speed is chosen so that the residence time of the paper material in the drum
is about 10 minutes. The product which emerges from the lower open end B is no longer a granulated crumb but discrete regular pellets.
It should be noted that the internal surface of the drum has a shallow helical ridge C from one end to the other, the shape of the ridge being cusp-shaped in cross section. This is thought to aid the pelletisation and help to prevent the crumb from forming into one solid mass.
v. The pellets are dried in a agricultural dryer normally used for drying grain. This is very suitable for this purpose and is able to dry the pellets to a very low residual water content if required, for example a water content of about 5% by weight. Magnetic objects are then removed by passing the dried pellets through a magnetic screening station.
vi. For many applications the pellets are then graded, for example by using standard grading equipment employing vibrating screens. Certain pellets which are too large or too small for any application may be re-cycled, for example by re- pulping them.
vii. The dried paper pellets are bagged up, for use as insulation materials for roof spaces and wall cavities, or as cat litter, or as absorbent pellets for absorbing spillages, for example of oils, greases, chemicals etc. Additives may be incorporated, for example flame retardant(s) , for insulation materials, and deodoriser(s) , for cat litter. Such additives may be introduced prior to
pelletisation, for example by addition to the fibre crumb, or after pelletisation, for example by spraying onto the pellets, after or, preferably before the drying stage.
It should be noted that the entire process of pulping and production of pellets is carried out at ambient temperature, using cold water.
Claims
1. A process for the formation of a fibre crumb into pellets, which process employs a rotary pelletiser in the form of a drum or barrel which subjects the fibre crumb introduced into it to a rolling and/or tumbling action.
2. A process as claimed in Claim 1, wherein the pelletiser has an internal surface which is not truly cylindrical, but which has raised parts and lower parts.
3. A process as claimed in Claim 2, wherein the internal surface of the pelletiser is formed with a helical ridge from one end to the other, the ridge being generally cusp-shaped in cross section.
4. A process as claimed in Claim 1, 2 or 3, wherein the pelletiser rotates with a circumferential speed in the range 6-150 metres per minute.
5. A process as claimed in any preceding claim, wherein the residence time of fibre crumb within the pelletiser is at least 5 minutes, but less than 40 minutes.
6. A process as claimed in any preceding claim, wherein the capacity of the pelletiser is in the range 1-lOm3.
A process as claimed in any preceding claim, wherein the pelletiser is elongated, with the axial length exceeding its diameter.
8. A process as claimed in Claim 7, wherein the ratio of the axial length to the diameter or mean diameter of the pelletiser is in the range 2-15:1.
9. A process as claimed in any preceding claim, wherein the pelletiser contains about 100-1,000 Kg of paper material during pelletisation.
10. A process as claimed in any preceding claim, wherein the pelletisation step is part of a continuous process, with pellet formation occurring at a rate of 2-10 tonnes per hour.
11. A process as claimed in any preceding claim, wherein the pelletiser is set with its axis of rotation at a slight incline to the horizontal, and the fibre crumb is loaded into the pelletiser at its raised end.
12. A process as claimed in any preceding claim, followed by a water removal step.
13. A process as claimed in any preceding claim, preceded by the step of preparing said fibre crumb, by the steps of: - tearing or cutting waste paper into pieces;
- pulping the torn or cut waste paper in an aqueous medium to make a pulp of consistency in the range 2- 20%;
- de-watering the pulp to make a fibre crumb of consistency in the range 20-70%; optionally subjecting the fibre crumb to a granulation step.
14. Use of pellets prepared by a process as claimed in any preceding claim, as pet litter.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9710068A GB2309929B (en) | 1994-12-20 | 1995-12-18 | Paper recycling |
AU42693/96A AU4269396A (en) | 1994-12-20 | 1995-12-18 | Paper recycling |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9425733.4 | 1994-12-20 | ||
GBGB9425733.4A GB9425733D0 (en) | 1994-12-20 | 1994-12-20 | Paper recycling |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996019284A1 true WO1996019284A1 (en) | 1996-06-27 |
Family
ID=10766246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1995/002984 WO1996019284A1 (en) | 1994-12-20 | 1995-12-18 | Paper recycling |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU4269396A (en) |
GB (1) | GB9425733D0 (en) |
WO (1) | WO1996019284A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0876758A1 (en) * | 1997-05-06 | 1998-11-11 | Kimberly-Clark Worldwide, Inc. | Process for the preparation of absorbent materials |
US6260511B1 (en) | 1996-01-24 | 2001-07-17 | Kimberly-Clark Worldwide, Inc. | Process for the preparation of absorbent materials |
SG81912A1 (en) * | 1997-05-14 | 2001-07-24 | Kimberly Clark Co | Process for the preparation of absorbent materials |
EP4183248A1 (en) * | 2021-11-22 | 2023-05-24 | JK Gitis OÜ | Method for preparing granules from waste of hydrophilic fibrous material |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789797A (en) * | 1971-11-12 | 1974-02-05 | Star Kist Foods | Cat litter |
GB2157722A (en) * | 1984-04-24 | 1985-10-30 | Kimberly Clark Co | Agglomerated cellulosic particles |
EP0447366A1 (en) * | 1990-03-16 | 1991-09-18 | Zürcher Ziegeleien | Granules, a process and apparatus for their production |
EP0515959A2 (en) * | 1991-05-23 | 1992-12-02 | Hard Ag | Granules and process or obtaining them |
US5209186A (en) * | 1992-02-07 | 1993-05-11 | Endurequest Corporation | Animal bedding nodules mode from paper pulp and method of making the same |
-
1994
- 1994-12-20 GB GBGB9425733.4A patent/GB9425733D0/en active Pending
-
1995
- 1995-12-18 AU AU42693/96A patent/AU4269396A/en not_active Abandoned
- 1995-12-18 WO PCT/GB1995/002984 patent/WO1996019284A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3789797A (en) * | 1971-11-12 | 1974-02-05 | Star Kist Foods | Cat litter |
GB2157722A (en) * | 1984-04-24 | 1985-10-30 | Kimberly Clark Co | Agglomerated cellulosic particles |
EP0447366A1 (en) * | 1990-03-16 | 1991-09-18 | Zürcher Ziegeleien | Granules, a process and apparatus for their production |
EP0515959A2 (en) * | 1991-05-23 | 1992-12-02 | Hard Ag | Granules and process or obtaining them |
US5209186A (en) * | 1992-02-07 | 1993-05-11 | Endurequest Corporation | Animal bedding nodules mode from paper pulp and method of making the same |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6260511B1 (en) | 1996-01-24 | 2001-07-17 | Kimberly-Clark Worldwide, Inc. | Process for the preparation of absorbent materials |
EP0876758A1 (en) * | 1997-05-06 | 1998-11-11 | Kimberly-Clark Worldwide, Inc. | Process for the preparation of absorbent materials |
AU742905B2 (en) * | 1997-05-06 | 2002-01-17 | Paper Technology Foundation Inc. | Process for the preparation of absorbent materials |
SG81912A1 (en) * | 1997-05-14 | 2001-07-24 | Kimberly Clark Co | Process for the preparation of absorbent materials |
EP4183248A1 (en) * | 2021-11-22 | 2023-05-24 | JK Gitis OÜ | Method for preparing granules from waste of hydrophilic fibrous material |
Also Published As
Publication number | Publication date |
---|---|
AU4269396A (en) | 1996-07-10 |
GB9425733D0 (en) | 1995-02-22 |
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