Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
  • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
  • B65D85/808—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package for immersion in the liquid to release part or all of their contents, e.g. tea bags
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/46—Applications of disintegrable, dissolvable or edible materials
  • B65D65/466—Bio- or photodegradable packaging materials
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
  • C08L77/12—Polyester-amides
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4266—Natural fibres not provided for in group D04H1/425
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H13/00—Other non-woven fabrics
• • 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
  • D21H27/08—Filter paper
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2230/00—Compositions for preparing biodegradable polymers
• • 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
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
  • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
• • 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
  • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • 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
  • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H13/24—Polyesters
• • 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
  • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H13/26—Polyamides; Polyimides
• • 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
  • D21H27/30—Multi-ply
  • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
• • 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
  • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
  • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

• the invention relates to a filter material consisting of at least one layer of natural fibers and at least a second layer of heat-sealable synthetic material which is biodegradable.
• EP-A 0 380 127 A2 describes a heat-sealable teabag paper and the process for producing it, the heat-sealing phase containing polyethylene and / or polypropylene and / or a copolymer of nylon chloride and vinyl acetate and the weight per unit area of this material between 10 and 15 g / m 2 .
• EP-A 656 224 (application number 94 107 709.1) describes a filter material, in particular for the production of tea bags and coffee bags or filters, with a basis weight between 8 and 40 g / m 2 , in which the heat-sealing layer consists of plastic fibers, preferably polypropylene or polyethylene, which is placed in the heated state on the first layer consisting of natural fibers.
• the German application DE-A 2 147 321 (US priority 23.09.70, US 74 722) describes a thermoplastic, heat-sealable composition which consists of a polyolefin powder (polyethylene or polypropylene) which is composed of a nylon chloride / Vinyl acetate copolymer is embedded. This material is also used for the heat-sealable finishing of paper-based fiber material.
• All of the filter materials mentioned require a proportion of at least 20 to 30% by weight of thermoplastic material, based on the total weight per unit area of the filter material, in order to produce a filter bag by heat sealing.
• the used filter materials for example tea bags, coffee bags or other filters
• a compost heap or in the organic waste bin After a certain period of time, which depends on other parameters such as temperature, air humidity, microorganisms, etc., the natural fiber components of the filter bag disintegrate and biodegrade, while the thermoplastic polymer fiber network is preserved and the quality of the compost is reduced.
• thermoplastic, non-biodegradable polymer i.e. the used filter bag should be sent to the non-recyclable waste (gray bin).
• the aim of the invention is therefore to create a completely biodegradable, heat-sealable filter material that is compostable and therefore also represents the cheapest and most economical and ecological solution.
• ner processes for the production of such filter materials are to be described.
• the invention relates to a filter material consisting of an at least two-layer structure, at least one layer containing natural fibers and one layer of biodegradable thermoplastic fibers, the thermoplastic
• Fibers are selected from the group of aliphatic or partially aromatic polyester amides, aliphatic or partially aromatic polyesters, aliphatic or partially aromatic polyester urethanes, aliphatic or aliphatic-aromatic polyester carbonates and can also be a mixture of two or more of these polymers.
• thermoplastic fibers can be placed on the layer of natural fibers both in one operation on the paper machine, and, in the heated state, can be deposited on this layer of paper made of natural fibers by meltblowing and melted, and both with and with each other the paper layer are fused.
• the first layer of the filter material generally has a basis weight between 8 and 40 g / m 2 , preferably from 10 to 20 g / m 2 and an air permeability of 300 to 4,000 l / m 2 -sec (DI ⁇ 53 887), preferably from 500 to 3,000 l / m 2 -sec.
• the second layer of the filter material preferably has a basis weight of 1 to 15 g / m 2 , preferably 1.5 to 10 g / m 2 .
• the first layer of the filter material made of natural fibers is preferably designed to be wet-strength.
• the filter material is used, for example, for the production of tea bags, coffee bags or tea or coffee filters.
• the filter material can be produced as follows:
• an aqueous suspension of the natural fibers is applied to a paper machine screen and in a second stage the heat-sealable, biodegradable polymer fibers are deposited on the natural fiber layer in such a way that they partially penetrate the natural fiber layer, the penetration of the two
• Known natural fibers such as hemp, manila, jute, sisal and other long-fiber wood pulp are used for the first layer and are produced in a manner known per se on a paper machine.
• a biodegradable thermoplastic polymer or a mixture of the following polymers in fiber form is used for the second layer, which is selected from the group of aliphatic or partially aromatic polyester amides, aliphatic or partially aromatic polyesters, aliphatic or partially aromatic polyester urethanes, aliphatic or aliphatic -aromatic polyester carbonates.
• Suitable biodegradable and compostable polymers are aliphatic or partially aromatic polyesters, thermoplastic aliphatic or partially aromatic polyester urethanes, aliphatic or aliphatic-aromatic polyester carbonates, aliphatic or partially aromatic polyester amides.
• the following polymers are suitable:
• A) aliphatic bifunctional alcohols preferably linear C 2 to o-dialcohols such as ethanediol, butanediol, hexanediol or particularly preferably butanediol and / or optionally cycloaliphatic bifunctional alcohols, preferably having 5 or 6 carbon atoms in the cycloaliphatic ring, such as cyclohexanedimethanol , and / or partially or completely instead of the diols monomeric or oligomeric polyols based on ethylene glycol, propylene glycol, tetrahydrofuran or copolymers thereof with molecular weights up to 4000, preferably up to 1000, and / or optionally small amounts of branched bifunctional alcohols, preferably C 3 -C 1 2- alkyldiols, such as neopentylglygol, and in addition, if appropriate, small amounts of higher-functional alcohols, such as 1,2,3
• aromatic acids not more than 50 wt .-%, based on all
• C) aliphatic bifunctional alcohols preferably linear C 2 to cio dialcohols such as ethanediol, butanediol, hexanediol, particularly preferably butanediol and / or optionally cycloaliphatic bifunctional alcohols, preferably with a C 5 - or C ⁇ -cycloaliphatic ring, such as for example Cyclohexanedimethanol, and / or partially or completely instead of the diols, monomeric or oligomeric polyols based on ethylene glycol, propylene glycol, tetrahydrofuran or copolymers thereof with molecular weights up to 4000, preferably up to 1000, and / or optionally small amounts of branched bifunctional alcohols, preferably C 3 - C 2 -alkyldiols, such as neopentylglygol, and additionally optionally small amounts of higher-functional alcohols, preferably C 3 -
• aromatic acids making up no more than 50% by weight, based on all acids
• ester content C) and / or D) is at least 75% by weight, based on the sum of C), D) and E).
• aliphatic bifunctional alcohols preferably linear C 2 to cio dialcohols such as, for example, ethanediol, butanediol, hexanediol or particularly preferably butanediol and / or optionally cycloaliphatic bifunctional alcohols, preferably having 5 to 8 C atoms in the cycloaliphatic ring, such as, for example, cyclohexanedimethanol , and / or partially or completely instead of the diols monomeric or oligomeric polyols based on ethylene glycol,
• G from acid- and alcohol-functionalized building blocks, preferably with 2 to 12 carbon atoms in the alkyl chain, for example hydroxybutyric acid, hydroxyvaleric acid, lactic acid, or their derivatives, for example ⁇ -caprolactone or dilactide,
• aromatic acids making up no more than 50% by weight, based on all acids
• ester fraction F) and / or G) at least 70% by weight, based on the sum of
• aliphatic bifunctional alcohols preferably linear C 2 to Cio dialko- hols such as ethanediol, butanediol, hexanediol, particularly preferably butanediol, and / or optionally cycloaliphatic bifunctional Alcohols, preferably with 5 to 8 carbon atoms, such as cyclohexanedimethanol, and / or partially or completely instead of the diols, monomeric or oligomeric polyols based on ethylene glycol, propylene glycol, tetrahydrofuran or copolymers thereof with molecular weights up to 4,000, preferably up to 1,000, and / or optionally small amounts of branched bifunctional alcohols, preferably C 3 -C 12 alkyldiols, such as neopentylglygol and additionally optionally small amounts of higher functional alcohols, preferably C 3 -C 12 alkylpolyols, such as
• K from acid- and alcohol-functionalized building blocks, preferably with 2 to 12 carbon atoms in the carbon chain, for example hydroxybutyric acid, hydroxyvaleric acid, lactic acid, or their derivatives, for example ⁇ -caprolactone or dilactide,
• aromatic acids making up no more than 50% by weight, based on all acids
• Hexamethylenediamine and from linear and / or cycloaliphatic bifunctional acids, preferably with 2 to 12 carbon atoms in the alkyl chain or C5 or C ⁇ ring in the case of cycloaliphatic acids, preferably adipic acid, and / or possibly small amounts of branched bifunctional and / or optionally aromatic bifunctional acids such as, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid and additionally optionally small amounts of higher functional acids, preferably with 2 to 10 carbon atoms, or
• the ester fraction I) and / or K) is at least 30% by weight, based on the sum of I), K), L) and M), preferably the weight fraction of the ester structures is 30 to 70
• the proportion of the amide structures is 70 to 30% by weight.
• the synthetically biodegradable heat-sealing fibers of the second layer partially penetrate the first layer and, during the drying process on the paper machine, envelop the natural fibers in the molten state. The necessary pores for filtration are left free.
• Filter material made of natural fibers and synthetic fibers in a general, roughly schematic representation.
• Fig. 1 the formation of the filter material according to the invention is shown in a schematic representation.
• the formation of a first fiber layer is shown in FIG.
• Natural fibers 1 and the formation of a second fiber layer of synthetic, biodegradable heat-sealable fibers 2 is shown.
• the formation of the second Layer with the fibers 2 thus takes place by deposition over the first layer, which is formed by the natural fibers 1.
• the natural fibers 1 are hatched horizontally to distinguish them, while the synthetic fibers 2 are hatched approximately vertically.
• Fig. Lb shows how a partial penetration of the two layers is achieved by the described dewatering of the two layers, in particular the second layer with the fibers 2, so that the synthetic fibers 2 get between the natural fibers 1.
• the partially penetrating layers 1 and 2 are dried and heated in such a way that the synthetic fibers 2 melt and, during re-consolidation, lay around the fibers 1 in such a way that they are at least partially covered.
• the filter material has thus become heat sealable (Fig. Lc).
• Fig. 2 shows the basic structure of a paper machine, as it can be used to produce a filter material according to the invention.
• a suspension "A” is formed from the ground natural fibers and water, and also a suspension “B” from the partially ground synthetic fibers and water.
• the suspension A is passed onto the screen 5, via the first two dewatering chambers 6, via suitable pipelines and pumping devices, which are not shown in more detail, the water being sucked off through the chambers 6 and the dewatering line.
• a first fiber layer of natural fibers 1 is formed on the moving sieve 5.
• the sieve 5 is moved further over the dewatering chambers 7, the second suspension B is fed in, Washing chambers 7 the second layer of synthetic fibers is deposited on the first layer.
• the drainage takes place via the drainage line.
• dewatering takes place via the dewatering chambers 8, as a result of which the two layers partially penetrate one another. By setting the drainage accordingly, the penetration can be more or less strong.
• the material 9 now formed from natural fibers and synthetic fibers is removed from the sieve and fed to drying.
• This drying can be done in different ways, e.g. by contact drying or through-flow drying.
• the elements 10 only give a rough schematic indication of corresponding drying elements.
• drying cylinders 10 are drawn, over which the shaped paper web is dried in the contact process.
• the heating of the two-layer fiber material causes the synthetic fibers 2 in the mixed layer 9 to melt.
• the synthetic fibers at least partially envelop the natural fibers and the heat-sealable filter material is rolled up on a roll 11.
• biodegradable polymer is in the form of granules, it can be removed using the
• Melt-blown fibers process formed into fibers and still hot adhesive state on a support, such as a paper made of natural fibers.
• the dried granulate 12 is transported to an extruder 13, in which it is melted and heated to the temperature required for fiber formation.
• This molten and heated polymer then reaches the MB nozzle 14.
• This nozzle has a large number of small openings through which the molten polymer is forced and drawn into fibers.
• These fibers 15 are caught by a strong air stream directly below this nozzle, stretched further, torn into different lengths and placed on a support, e.g. a paper 16, which lies on a suction roller 17, deposited. Since these fibers are still hot and sticky, they stick to the natural fibers of the paper.
• the material is then rolled up on the winder 18 in the cooled state.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Biodiversity & Conservation Biology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Laminated Bodies (AREA)
• Biological Depolymerization Polymers (AREA)
• Filtering Materials (AREA)
• Paper (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1997
  • 1997-05-13 DE DE1997119807 patent/DE19719807A1/de not_active Withdrawn
• 1998
  • 1998-04-30 WO PCT/EP1998/002553 patent/WO1998051396A1/de not_active Application Discontinuation
  • 1998-04-30 CA CA 2289739 patent/CA2289739A1/en not_active Abandoned
  • 1998-04-30 KR KR1019997010450A patent/KR20010012495A/ko not_active Application Discontinuation
  • 1998-04-30 AU AU76511/98A patent/AU743370B2/en not_active Ceased
  • 1998-04-30 EP EP98924249A patent/EP0981400A1/de not_active Withdrawn
  • 1998-04-30 CN CN98804933A patent/CN1255072A/zh active Pending
  • 1998-04-30 JP JP54873898A patent/JP2001524873A/ja active Pending
  • 1998-05-05 TW TW87106872A patent/TW505722B/zh active
• 1999
  • 1999-11-04 NO NO995401A patent/NO995401D0/no not_active Application Discontinuation

Non-Patent Citations (1)

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