FR2521029A1 - DIATOMITE SUPPORT LAYER AND METHOD FOR MANUFACTURING THE SAME - Google Patents
DIATOMITE SUPPORT LAYER AND METHOD FOR MANUFACTURING THE SAME Download PDFInfo
- Publication number
- FR2521029A1 FR2521029A1 FR8301783A FR8301783A FR2521029A1 FR 2521029 A1 FR2521029 A1 FR 2521029A1 FR 8301783 A FR8301783 A FR 8301783A FR 8301783 A FR8301783 A FR 8301783A FR 2521029 A1 FR2521029 A1 FR 2521029A1
- Authority
- FR
- France
- Prior art keywords
- fibers
- support layer
- diatomite
- polyolefin fibers
- layer
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title description 4
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 229920000098 polyolefin Polymers 0.000 claims abstract description 14
- -1 POLYETHYLENE Polymers 0.000 claims abstract description 9
- 239000004743 Polypropylene Substances 0.000 claims abstract description 5
- 229920001155 polypropylene Polymers 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 7
- 239000004698 Polyethylene Substances 0.000 abstract description 4
- 229920000573 polyethylene Polymers 0.000 abstract description 4
- 239000002671 adjuvant Substances 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 7
- 230000008961 swelling Effects 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000758 substrate Substances 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
L'INVENTION CONCERNE UNE COUCHE DE SUPPORT DE DIATOMITE ET SON PROCEDE DE FABRICATION. DANS LADITE COUCHE, ENTRE 20 ET 50 EN POIDS, PAR RAPPORT A LA MASSE TOTALE DES FIBRES DE LADITE COUCHE (A L'ETAT SEC), CONSISTENT EN DES FIBRES DE POLYOLEFINE (POLYETHYLENE PUR OU POLYPROPYLENE PUR) D'UNE LONGUEUR DE 0,8MM A 1,2MM. APPLICATION NOTAMMENT AUX DISPOSITIFS DE FILTRATION AVEC UTILISATION D'UN ADJUVANT DE FILTRATION, TEL QUE LA DIATOMITE.THE INVENTION RELATES TO A DIATOMITE SUPPORT LAYER AND ITS MANUFACTURING PROCESS. IN THE SAID LAYER, BETWEEN 20 AND 50 BY WEIGHT, IN RELATION TO THE TOTAL MASS OF THE FIBERS OF THE SAID LAYER (IN THE DRY STATE), CONSIST OF POLYOLEFIN FIBERS (PURE POLYETHYLENE OR PURE POLYPROPYLENE) OF A LENGTH OF 0, 8MM TO 1.2MM. APPLICATION IN PARTICULAR TO FILTRATION DEVICES WITH USE OF A FILTRATION ADJUVANT, SUCH AS DIATOMITY.
Description
La présente invention se rapporte à une couche deThe present invention relates to a layer of
support de diatomitejqui est fabriquée par la mise en suspen- diatomite support which is manufactured by suspending
sion de fibres natives et leur séchage subséquent et qui, of native fibers and their subsequent drying and which,
par l'utilisation d'agents de prise de consolidation, est rendue résis- by the use of consolidating agents, is made resistant
tante à l'humidité par rapport aux fluides devant être aunt to moisture compared to the fluids to be
filtrés L'invention concerne également un procédé de fabri- The invention also relates to a process for producing
cation de cette couche de support.cation of this support layer.
Lors de la filtration avec diatomite comme adjuvant dans des filtrespresses correspondants, des couches de support servent de couches poreuses et perméables à l'eau sur lesquelles l'adjuvant de filtration (diatomite) est mis en suspension When filtering with diatomite as an adjunct in corresponding filterspresses, support layers serve as porous and water-permeable layers on which the filter aid (diatomite) is suspended.
et donne ainsi naissance au gâteau de diatomite filtrant. and thus gives rise to the filtering diatomite cake.
A l'achèvement d'un cycle de filtration, le filtre-presse est ouvert, puis le gâteau de diatomite est séparé par At the completion of a filter cycle, the filter press is opened, then the diatomite cake is separated by
raclage et enlevé par lavage des couches de support Immédia- scraped off and washed off the carrier layers immediately
tement après, le filtre-presse est de nouveau mis en route After that, the filter press is again switched on
et un nouveau cycle de filtration peut commencer. and a new filtration cycle can begin.
Le brevet DE-C-933 447 a décrit des couches de support à pores grossiers qui, consistant en des fibres organiques ou anorganiques ou bien en des mélanges de ces fibres, servent de substrat à une couche filtrante susJacente à pores fins Ces couches sont fabriquées en étant traitées comme de la pâte à papier et, pour éviter des effilochages, DE-C-933 447 discloses coarse-pore support layers which, consisting of organic or inorganic fibers or mixtures of these fibers, serve as a substrate for a fine-pore filtering layer. These layers are manufactured by being treated like pulp and, to avoid fraying,
elles sont traitées à l'aide de liants pour consolider les fibres. they are treated with binders to consolidate the fibers.
En guise de liants, on utilise des adhésifs, des résines ou des substances analogues qui sont insolubles dans le liquide à filtrer et qui, en plus d'une prise de consolidation des fibres, augmentent la résistance de la couche de support à des contraintes mécaniques et doivent permettre d'améliorer leurs propriétés de résistance à l'humidité afin d'éviter As binders, adhesives, resins or the like are used which are insoluble in the liquid to be filtered and which, in addition to consolidating the fibers, increase the strength of the support layer to mechanical stresses. and must improve their moisture resistance properties in order to avoid
des dilatations dues au gonflement à l'état humide. dilations due to swelling in the wet state.
Il s'est toutefois avéré que les propriétés de résis- It turned out, however, that the properties of
tance à l'humidité des couches de support connues traitées avec les liants indiqués ne satisfont pas aux exigences de moisture content of the known carrier layers treated with the binders indicated do not meet the requirements of
la pratique ou y satisfont seulement de manière imparfaite. practice or only imperfectly meet it.
Au bout d'un certain temps d'utilisation des couches de support connues, notamment lors de stérilisations répétées à la vapeur ou à l'eau chaude, l'effet de résistance à l'humidité diminue, de sorte qu'il se produit des détériorations qui After a certain time of use of the known support layers, in particular during repeated sterilizations with steam or hot water, the effect of resistance to humidity decreases, so that deteriorations
nécessitent la mise en service de nouvelles couches de support. require the commissioning of new support layers.
Cette diminution de l'effet de résistance à l'humidité entra Ine aussi une augmentation des dilatations dues au gon- flement, ce qui fait qu'il devient compliqué de travailler This reduction of the moisture resistance effect also leads to an increase in expansion due to inflation, which makes it difficult to work.
avec les couches de support étant donné que, avant leur utili- with the support layers since, before their use,
sation, elles doivent préalablement être gonflées à la valeur finalejpar imprégnation En outre, concernant les liants prévus pour les couches de support connues, il convient de vérifier si l'utilisation de ces liants, pour rendre les couches de support résistantes à l'humidité est envisageable aux termes de la législation en vigueur pour les produits ali mentaires, et d'exclure'd'emblée en tant que liants des résines In addition, with regard to the binders provided for the known support layers, it should be ascertained whether the use of these binders, in order to render the support layers resistant to moisture, is to be effected at the final value by impregnation. under existing legislation for food products, and to exclude as binders from resins
qui manifestent une séparation et un dégagement de formaldéhydes. which show separation and release of formaldehyde.
La présente invention a par conséquent pour objet de The present invention therefore aims to
proposer une couche de support de diatomite qui, tout en évi- propose a layer of diatomite support which, while
tant les liants inadmissibles en vertu des lois en vigueur pour les produits alimentaires, présente des propriétés remarquables de résistance à l'humidité et est en même temps pratiquement exempte de dilatations dues au gonflement, ce qui dispense de la fastidieuse opération préalable de gonflement both the binders ineligible under the laws in force for foodstuffs, has remarkable properties of resistance to moisture and is at the same time virtually free of expansions due to swelling, eliminating the tedious prior operation of swelling
à la valeur finale des couches de support connues jusqu'à présent. to the final value of the support layers known hitherto.
Selon les caractéristiques essentielles de l'invention, entre 20 X et 50 X en poids,par rapport à la masse totale des fibres de la couche de support de diatomite (à l'état sec),consistent en des fibres de polyoléfine d'une longueur de 0,8 mm à 1,2 mm Conformément à l'invention, ces fibres de polyoléfine peuvent consister en du polyéthylène pur ou According to the essential features of the invention, between 20 and 50% by weight, based on the total mass of the fibers of the diatomite support layer (in the dry state), consist of polyolefin fibers of length of 0.8 mm to 1.2 mm According to the invention, these polyolefin fibers may consist of pure polyethylene or
en du polypropylène pur.pure polypropylene.
Selon les caractéristiques essentielles du procédé proposé par l'invention pour fabriquer la couche de support de diatomite selon l'invention, les 20 X à 50 X en poids de fibres de polyoléfine présentant la longueur recommandée de 0,8 am à 1,2 mm scnt ajoutés à la suspension aqueuse de fibres natives, cette suspension du mélange de fibres est immédiatenent ensuite ment ensuite déposée sur une bande de toile et débarrassée de son eau, après quoi la couche est séchée à la température de frittage des fibres de polyoléfine Il en résulte un frittage des fibres de polyoléfine aux zones de croisement ou de contact avec les According to the essential characteristics of the process proposed by the invention for producing the diatomite support layer according to the invention, the X 2 to 50% by weight of polyolefin fibers having the recommended length of 0.8 am to 1.2 mm. When added to the aqueous suspension of native fibers, this suspension of the fiber mixture is immediately then subsequently deposited on a web of cloth and freed from its water, after which the layer is dried at the sintering temperature of the polyolefin fibers II. sintering of the polyolefin fibers at the crossing or contact zones with the
fibres natives, ainsi qu'un frittage de ces fibres de polyolé- fibers, as well as sintering of these polyolefin fibers.
fine entre elles et que,après le refroidissement de la couche de support de diatomite, cette dernière présente une structure fibreuse largement cohérente Une telle couche de support de diatomite est pratiquement exempte d'effilochages De plus, grâce à la réduction de la dilatation par gonflement, elle présente les meilleures propriétés de résistance à l'humidité et elle est en outre admissible par la législation en matière d'aliments De surcroît, sa durée d'utilisation est considérablement plus longue lorsqu'elle est employée à between them and that, after the cooling of the diatomite support layer, the latter has a largely coherent fibrous structure Such a diatomite support layer is practically free from fraying. it has the best moisture resistance properties and is also eligible under the food legislation. In addition, its useful life is considerably longer when it is used in the food industry.
des fins de filtration.filtration purposes.
Pour fabriquer les couches de support'de diatomite selon l'invention, on utilise une pâte de matière fibreuse consistant en cellulose ou en d'autres fibres In order to manufacture the diatomite support layers according to the invention, a pulp of fibrous material consisting of cellulose or other fibers is used.
natives telles que des linters de coton (on utilise habituelle- native ones such as cotton linters (we usually use
ment des mélanges de fibres de cellulose et de linters de coton), et l'on ajoute à cette pâte,-par rapport mixtures of cellulose fibers and cotton linters), and to this paste,
à la masse totale des fibres de la couche de support de diato- to the total mass of the fibers of the diatomaceous support layer
mite (à l'état sec), de 20 % à 50 X en poids de fibres de poly- mite (in the dry state), from 20% to 50% by weight of poly-
oléfine consistant en des fibres de polyéthylène pur ou en des fibres de polypropylène pur présentant à chaque fois une longueur comprise entre 0, 8 mm et 1,2 mm Il s'agit toujours de suspensions aqueuses de fibres Ce mélange de matières des fibres natives et des fibres synthétiques, dont le véhicule de suspension est de l'eau, est dilué préalablement à la fabrication des couches jusqu'à atteindre une densité de 0,5 % à 1 X, puis il est placé sur une bande de toile, tournant en continu, d'une machine de fabrication (analogue aux machines olefin consisting of pure polyethylene fibers or pure polypropylene fibers each having a length of between 0.8 mm and 1.2 mm. These are always aqueous suspensions of fibers. synthetic fibers, whose suspension vehicle is water, is diluted prior to the manufacture of the layers to a density of 0.5% to 1 X, then it is placed on a strip of cloth, rotating in continuous, of a manufacturing machine (similar to machines
connues d'élaboration de la pâte à papier), et l'eau est enle- pulp production), and the water is removed.
vée de la suspension et traverse la bande de toile, par gra- from the suspension and cross the fabric strip, by
vité puis sous l'effet d'une dépression engendrée par des aspirateurs Il se forme ainsi sur la toile une couche formée par les fibres natives et synthétiques et dans and then under the effect of a depression generated by vacuum cleaners It thus forms on the canvas a layer formed by the native and synthetic fibers and in
laquelle les fibres sont réparties selon un désordre significa- which the fibers are distributed according to a significant disorder.
tif c'est-à-dire d'une manière bien régulière selon des axes X, Y, et Z En fonction du poids de couche devant être obtenu par unité de surface, la vitesse de la bande de toile de la machine de fabrication est réglée dans une plage comprise entre 5 m:Min et 25 m/min. Ensuite, la couche appliquée sur une bande de toile métallique à fils plats passe par un sécheur dans lequel ladite côuche est séchée à l'aide d'un courant d'air chaud'et dans lequel les fibres de polyoléfine sont frittées aussi bien les unes that is to say in a very regular way along X, Y, and Z axes. Depending on the weight of the layer to be obtained per unit area, the speed of the fabric web of the manufacturing machine is set within a range of 5 m: min to 25 m / min. Subsequently, the layer applied to a flat wire web is passed through a dryer in which said web is dried with a hot air stream and in which the polyolefin fibers are sintered as well.
avec les autres qu'avec les fibres natives sous une surveil- with others than with native fibers under a
lance précise de la température ( > 1250 C < 1400 C, pour les fibres de polyéthylène; > 150 'C < 1700 C pour les fibres de polypropylène) Ce frittage mutuel des fibres confère à la couche sa grande résistance souhaitée à llhumidité et il accurate lance of the temperature (> 1250 C <1400 C, for the polyethylene fibers,> 150 'C <1700 C for the polypropylene fibers) This mutual sintering of the fibers gives the layer its desired high resistance to humidity and it
provoque également, de la manière souhaitée, la forte diminu- also causes, as desired, the sharp decrease in
tion du gonflement de la couche lors de son imprégnation La surveillance précise de la température doit empêcher une swelling of the layer during impregnation Accurate temperature monitoring should prevent
fusion des fibres de polyoléfine, car la structure morpholo- fusion of polyolefin fibers because the morphological structure
gique des fibres doit demeurer intacte pour la perméabilité fiber must remain intact for permeability
et le pouvoir de séparation souhaités de la couche. and the desired separation power of the layer.
Il va de soi que de nombreuses modifications peuvent être apportées à la couche de support et aux procédés décrits, It goes without saying that many modifications can be made to the support layer and the methods described,
sans sortir du cadre de l'invention. without departing from the scope of the invention.
Claims (4)
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 (2)
| Publication Number | Publication Date |
|---|---|
| FR2521029A1 true FR2521029A1 (en) | 1983-08-12 |
| FR2521029B1 FR2521029B1 (en) | 1986-01-31 |
Family
ID=6154985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8301783A Expired FR2521029B1 (en) | 1982-02-06 | 1983-02-04 | DIATOMITE SUPPORT LAYER AND MANUFACTURING METHOD THEREOF |
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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE933447C (en) * | 1949-03-15 | 1955-09-29 | Filtrox Werk Ag | Frame filter press |
| 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 |
| DE2900956A1 (en) * | 1978-01-13 | 1979-07-19 | Giovanni Munari | PROCESS FOR THE MANUFACTURING OF HEAT-WELDABLE, WATER-NON-PERMEABLE PAPER OR OF THE SUCH PAPER |
| DE2940510A1 (en) * | 1978-10-05 | 1980-04-24 | Maruchi Kohken Co | METHOD FOR REPROCESSING WATER-SOLUBLE CUTTING AGENTS |
| GB2047295A (en) * | 1979-04-19 | 1980-11-26 | Montedison Spa | Separators for Lead Acid Accumulators |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
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 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
- 1983-02-04 IE IE222/83A patent/IE53885B1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE933447C (en) * | 1949-03-15 | 1955-09-29 | Filtrox Werk Ag | Frame filter press |
| 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 |
| DE2900956A1 (en) * | 1978-01-13 | 1979-07-19 | Giovanni Munari | PROCESS FOR THE MANUFACTURING OF HEAT-WELDABLE, WATER-NON-PERMEABLE PAPER OR OF THE SUCH PAPER |
| DE2940510A1 (en) * | 1978-10-05 | 1980-04-24 | Maruchi Kohken Co | METHOD FOR REPROCESSING WATER-SOLUBLE CUTTING AGENTS |
| GB2047295A (en) * | 1979-04-19 | 1980-11-26 | Montedison Spa | Separators for Lead Acid Accumulators |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8302913D0 (en) | 1983-03-09 |
| IT8347672A0 (en) | 1983-02-04 |
| FR2521029B1 (en) | 1986-01-31 |
| IE53885B1 (en) | 1989-03-29 |
| GB2115028B (en) | 1985-08-07 |
| IT1167072B (en) | 1987-05-06 |
| DE3204120C3 (en) | 1994-12-22 |
| CH661668A5 (en) | 1987-08-14 |
| ES519547A0 (en) | 1984-04-16 |
| IE830222L (en) | 1983-08-06 |
| DE3204120A1 (en) | 1983-08-18 |
| ES8403736A1 (en) | 1984-04-16 |
| GB2115028A (en) | 1983-09-01 |
| DE3204120C2 (en) | 1986-03-13 |
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