GB2115028A - Kieselguhr support element - Google Patents
Kieselguhr support element Download PDFInfo
- Publication number
- GB2115028A GB2115028A GB08302913A GB8302913A GB2115028A GB 2115028 A GB2115028 A GB 2115028A GB 08302913 A GB08302913 A GB 08302913A GB 8302913 A GB8302913 A GB 8302913A GB 2115028 A GB2115028 A GB 2115028A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibres
- support element
- polyolefine
- fibre
- kieselguhr
- 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.)
- Granted
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 229920000098 polyolefin Polymers 0.000 claims abstract description 22
- 239000005445 natural material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000725 suspension Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000008365 aqueous carrier Substances 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 230000008961 swelling Effects 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 241000252254 Catostomidae Species 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical class O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 235000019256 formaldehyde Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1615—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of natural origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
-
- 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
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
- D21H5/20—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres
- D21H5/202—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres polyolefins
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
To increase the liquid-proof properties and to avoid swelling expansion in a kieselguhr support element, which is produced by deposit from a slurry of untreated fibres and subsequent drying and which finds application in kieselguhr matting filtration in a filter press, 20 to 50% by weight with respect to the total fibre mass of the support element (considered dry) consists of polyolefine fibres with a fibre length of 0.8 to 1.2 millimetres. For the production of the support element, the polyolefine fibres are added to an aqueous suspension of natural material fibres, the fibre mixture suspension is deposited on a sieve belt and drained, and the layer is dried at the sintering temperature of the polyolefine fibres.
Description
SPECIFICATION
Kieselguhr support element
The present invention relates to a kieselguhr support element and to a method for production of the element.
Support elements serve in the kieselguhr matting filtration in appropriate filter presses as porous, water-permeable layers, onto which the filter medium -the kieselg uhr -- is deposited from a slurry and a filtering kieselguhr cake is formed as a result. After completion of a filtration cycle, the filter press is opened, the kieselguhr cake is scraped off the support element and sprayed away. Subsequently, the filter press is closed and a further filtration cycle can start.
Coarsley porous support elements of organic or inorganic fibres or mixtures of these fibres, which serve as a support for a finely porous filter layer lying thereon, are known from DE-PS 933 447.
They are produced by the same kind of processing as for paper and, for the avoidance of loosening of the fibres, they are treated with binding agents for the solidification of the fibres. Adhesive substances, resins or the like, which are insoluble in relation to the liquid to be filtered, serve as binding means which, apart from solidification of the fibres, increase the capability of resistance of the support element to mechanical stresses and improves its liquid-proof properties for the avoidance of swelling expansion in the wet state.
It has, however, proved that the known support elements treated with the afore-mentioned binding means do not meet or only incompletely meet the requirements with respect to their liquidproof properties. The liquid-proof effect reduces with the duration of the use of the known support elements, particularly in the case of repeated sterilising by steam or hot water so that damage occurs, which necessitates the use of new support elements. The increase in the swelling expansion is also connected with low liquid-proof effect, which leads to an awkward mode of operation with the support elements in that they must be initially swelled to the final dimension by means of wetting before use.In the case of the binding means provided for the known support elements, it is necessary to ensure that the binding means are harmless, according to current foodstuffs regulations, for use in liquid-proofing the support elements and that resins, which release formaldehydes, are excluded for use as such binding means.
There is therefore a. need for a kieselguhr support element which avoids use of binding means impermissible under current foodstuffs regulations and which has good liquid-proof properties and is practically free from swelling, so as to obviate the awkward preliminary swelling required for known support elements.
According to one aspect of the present invention there is provided a support element for a kieselguhr liquid filter comprising a fibre mat which is resistant to the liquid to be filtered by such kieselguhr filter and which is produced by drying a slurry deposited of natural material fibres and polyolefine fibres, the polyolefine fibres comprising 20 to 50% by weight of the dry fibre mass of the mat and having a fibre length of 0.8 to 1.2 millimetres.
According to another aspect of the invention there is provided a method of producing a support element according to the first aspect of the invention, the method comprising the steps of adding to an aqueous suspension of natural material fibres a quantity of polyolefine fibres equal to 20 to 50% by weight of the total fibre mass when dry, the polyolefine fibres having a fibre length of 0.8 to 1.2 millimetres, depositing the fibre mixture suspension as a layer on sieve means, extracting the aqueous carrier from the deposited layer, and then drying the layer at such a temperature as to cause sintering of the polyolefine fibres.
In a preferred example of this method, the 20 to
50% by weight of polyolefine fibres with a fibre length of 0.8 to 1.2 millimetres are added to the aqueous solution of natural material fibres, the suspension of the fibre mixture is then deposited on a sieve belt and drained, and the deposited layer is thereafter dried at the sintering temperature of the polyolefine fibres. As a result, the polyolefine fibres sinter at the crossing or contact points with the natural material fibres and also with each other, so that after the support element has cooled down it has a largely contiguous fibre structure. A support element of that kind is practically free from loosening of fibres. Through the reduction of the swelling expansion, it has good liquid-proof properties and moreover is acceptable under foodstuffs regulations. The useful life for filtration may also be appreciably longer.
In production, according to a preferred example of the method of the invention, of a kieselguhr support element embodying the invention, there is provided a fibrous substance mash consisting of cellulose or other untreated fibres, for example cotton lints - usually, a mixture of cellulose fibres and cotton lints is used - to which there is added 20 to 50% by weight, referred to the total fibre mass of the support element (considered dry), of polyolefine fibres having a fibre length of 0.8 to 1.2 millimetres. The polyolefine fibres may be pure polyethylene fibres or pure polypropylene fibres. The mash is an aqueous fibre suspension.
The fibre mixture, with water as the carrier, of the natural material and the synthetic fibres is diluted for production of a layer, with a substance density of 0.5 to 1.0%, applied to a circulating endless sieve belt of a production machine, similar to a known paper machine. The water is withdrawn through the sieve belt by means of gravity and subsequently by means of suckers through vacuum of the suspension. Thereby there is formed on the sieve belt a layer of the natural material and synthetic fibres, in which layer the fibres are distributed in a meaningful disorder quite uniformly in the X, Y and Z axes. The sieve belt speed of the production machine is set to 5 to 25 metres per minute according to the weight per unit area of the layer to be produced.
The layer is subsequently passed, on a flat wire sieve belt, through a drier, in which the layer is dried by means of hot air and the polyolefine fibres are sintered together and to the natural material fibres through exact temperature conduction, between 1 250C and 14000 for polyethylene fibres and between 1 5000 and 1 7000 for polypropylene fibres. This sintering of the fibres together provides the desired high wetting proofness of the layer and likewise the desired strongly reduced swelling of the layer during the wetting. The exact temperature conduction is necessary to ensure that the polyolefine fibres do not melt, because the morphological structure of the fibres must be maintained for the desired permeability and separation capability of the layer.
Claims (7)
1. A support element for a kieselguhr liquid filter comprising a fibre mat which is resistant to the liquid to be filtered by such kieselguhr filter and which is produced by drying a slurry deposit of natural material fibres and polyolefine fibres, the polyolefine fibres comprising 20 to 50% by weight of the dry fibre mass of the mat and having a fibre length of 0.8 to 1.2 millimetres.
2. A support element as claimed in claim 1, wherein the polyolefine fibres are pure polyethylene fibres.
3. A support element as claimed in claim 1, wherein the polyolefine fibres are pure polypropylene fibres.
4. A support element as claimed in claim 1 and substantially as hereinbefore described.
5. Filter means comprising a kieselguhr liquid filter supported by a support element as claimed in any one of the preceding claims.
6. A method of producing a support element as claimed in claim 1, comprising the steps of adding to an aqueous suspension of natural material fibres a quantity of polyolefine fibres equal to 20 to 50% by weight of the total fibre mass when dry, the polyolefine fibres having a fibre length of 0.8 to 1.2 millimetres, depositing the fibre mixture suspension as a layer on sieve means, extracting the aqueous carrier from the deposited layer, and then drying the layer at such a temperature as to cause sintering of the polyolefine fibres.
7. A method as claimed in claim 6 and substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3204120A DE3204120C3 (en) | 1982-02-06 | 1982-02-06 | Porous support layer for a diatomaceous earth filter cake formed by floating and process for its production |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8302913D0 GB8302913D0 (en) | 1983-03-09 |
| GB2115028A true GB2115028A (en) | 1983-09-01 |
| GB2115028B GB2115028B (en) | 1985-08-07 |
Family
ID=6154985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08302913A Expired GB2115028B (en) | 1982-02-06 | 1983-02-03 | Kieselguhr support element |
Country Status (7)
| Country | Link |
|---|---|
| CH (1) | CH661668A5 (en) |
| DE (1) | DE3204120C3 (en) |
| ES (1) | ES8403736A1 (en) |
| FR (1) | FR2521029B1 (en) |
| GB (1) | GB2115028B (en) |
| IE (1) | IE53885B1 (en) |
| IT (1) | IT1167072B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3802816A1 (en) * | 1988-01-30 | 1989-08-10 | Seitz Filter Werke | Candle-shaped filter element, filter candle |
| DE10229291A1 (en) * | 2002-06-29 | 2004-02-05 | E. Begerow Gmbh & Co | Filter material, especially in the form of a depth filter layer |
| DE10346256B3 (en) * | 2003-09-24 | 2004-10-21 | E. Begerow Gmbh & Co | Production of filter material, especially deep filter layer, with predetermined number of natural fibers, e.g. cellulose, includes adding specific enzyme to suspension to convert each toxic polysaccharide to nontoxic or less toxic product |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE494548A (en) * | 1949-03-15 | |||
| CH313369A (en) * | 1951-12-24 | 1956-04-15 | Seitz Werke Gmbh | Process for the production of filter bodies with increased strength from fibrous or granular materials |
| GB1362344A (en) * | 1971-07-23 | 1974-08-07 | Gulf Research Development Co | Paper product and process for production thereof |
| GB1411776A (en) * | 1972-11-21 | 1975-10-29 | Mitsubishi Paper Mills Ltd | Method for producing a non-woven fabric |
| US4156628A (en) * | 1976-01-28 | 1979-05-29 | Hercules Incorporated | Preparation of hydrophilic polyolefin fibers for use in papermaking |
| US4084949A (en) * | 1975-11-06 | 1978-04-18 | The Dexter Corporation | Surgical face mask filtering medium |
| IT1074822B (en) * | 1977-01-21 | 1985-04-20 | Montedison Spa | PREPARATION OF FILTERS WITH THE USE OF SYNTHETIC FIBERS |
| IT1105843B (en) * | 1978-01-13 | 1985-11-04 | Munari Giovanni | PROCEDURE FOR THE MANUFACTURE OF WATERPROOF AND HEAT-SEALABLE PAPER OR CARDBOARD IN A CONTINUOUS MACHINE |
| JPS5841083B2 (en) * | 1978-10-05 | 1983-09-09 | 日産自動車株式会社 | How to recycle water-soluble cutting fluid |
| GB2047295B (en) * | 1979-04-19 | 1983-01-06 | Montedison Spa | Separators for lead acid accumulators |
-
1982
- 1982-02-06 DE DE3204120A patent/DE3204120C3/en not_active Expired - Fee Related
-
1983
- 1983-02-03 GB GB08302913A patent/GB2115028B/en not_active Expired
- 1983-02-03 CH CH619/83A patent/CH661668A5/en not_active IP Right Cessation
- 1983-02-04 IE IE222/83A patent/IE53885B1/en unknown
- 1983-02-04 IT IT47672/83A patent/IT1167072B/en active
- 1983-02-04 FR FR8301783A patent/FR2521029B1/en not_active Expired
- 1983-02-04 ES ES519547A patent/ES8403736A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2115028B (en) | 1985-08-07 |
| FR2521029B1 (en) | 1986-01-31 |
| DE3204120A1 (en) | 1983-08-18 |
| ES519547A0 (en) | 1984-04-16 |
| FR2521029A1 (en) | 1983-08-12 |
| CH661668A5 (en) | 1987-08-14 |
| GB8302913D0 (en) | 1983-03-09 |
| DE3204120C2 (en) | 1986-03-13 |
| IE830222L (en) | 1983-08-06 |
| IT8347672A0 (en) | 1983-02-04 |
| IE53885B1 (en) | 1989-03-29 |
| DE3204120C3 (en) | 1994-12-22 |
| IT1167072B (en) | 1987-05-06 |
| ES8403736A1 (en) | 1984-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010203 |