GB2177127A - Method of manufacturing a filter medium - Google Patents

Method of manufacturing a filter medium Download PDF

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Publication number
GB2177127A
GB2177127A GB08517077A GB8517077A GB2177127A GB 2177127 A GB2177127 A GB 2177127A GB 08517077 A GB08517077 A GB 08517077A GB 8517077 A GB8517077 A GB 8517077A GB 2177127 A GB2177127 A GB 2177127A
Authority
GB
United Kingdom
Prior art keywords
bed
fibre
fibre glass
filter medium
fibrous
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.)
Withdrawn
Application number
GB08517077A
Other versions
GB8517077D0 (en
Inventor
Stanislaw Cichocki
Wieslaw Kiepiel
Jan Pajak
Kazimierz Wolek
Andrzej Wyroslak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OS BAD ROZWOJOWY PRZEM BUDOWY
Original Assignee
OS BAD ROZWOJOWY PRZEM BUDOWY
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by OS BAD ROZWOJOWY PRZEM BUDOWY filed Critical OS BAD ROZWOJOWY PRZEM BUDOWY
Priority to GB08517077A priority Critical patent/GB2177127A/en
Priority to NL8502153A priority patent/NL8502153A/en
Publication of GB8517077D0 publication Critical patent/GB8517077D0/en
Publication of GB2177127A publication Critical patent/GB2177127A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • 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
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • 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
    • 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • B01D39/202—Glass or glassy material the material being filamentary or fibrous sintered or bonded by inorganic agents
    • 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
    • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation

Abstract

A method of manufacturing a fibre glass filter medium, particularly useful for demisters, and ensuring relatively small flow resistances. The method comprises preliminary cutting the fibre glass into 30-50 mm lengths, and then removing the contaminants by means of elevated temperature. Fibre glass thus pretreated is mixed with 15-40% wt. of polyester fibre, after which a fibrous mat is formed, the mat being compacted and joined by needling and the mat is burnt at a temperature barely sufficient to destruct the admixed polyester fibre.

Description

SPECIFICATION Method of manufacturing a filter medium This in vision relates to a method of manufacturing a filter m -m, m, particularly made from fibre glass and intended especially for demisting and dust and soot extraction from fluids at elevated temperature condi tions and with chemically corrosive material present.
Known filter media used for this purpose are made from various fibres forming a felted fibrous bed placed in baskets or cassettes with openwork walls enabling he fluid to be purified to flow ti rough filter medium placed inside them.
Wllen producing such filter media it is difficultto obtain a required, uniformly dense, packing bed, the fregilefibre, e.g., fibre glass, crumbling and thus adversel t affecting the flow resistances.
Inorderto remove mist and dust from fluids containing chemically corrosive materials, filter media are produced from polyamide fibres, from PTFE, as well as from fibre glass coated for example with graphite or with silicones, and shaped to form a bed having a thickness as required and then undergoing needling to make its structure stable. However, filter media thus obtained are expensive andtheiruse is restricted to temperature conditions not resulting in destruction or deformation of the fibre material which they are made from.
The present invention aims to overcome or at least mitigate such disadvantages by providing a method of manufacturing a filter medium which would be resistant to chemical corrosion and to elevated temperature, and which would exhibit a uniform packing density and consequently a low differentia- tion of flow resistances.
The present invention provides a method of manu ï-aciuring a filter medium, wherein fibre glass cut into '!0-50 n.m lengths is soaked at 300-450 C for a time sufficient to remcvetheflbrous preparation, after which 15 405ó wt. of polyesterflbre is added, the said polyester fibre having a diameter similar to that of the fibre glass used, and wherein after both fibres are mixed .ogether a ribrous bed is formed, the said fibrous bed being then compacted a thickness of 5-20 mm and joined by needling, aftervihich the filter meatiun î thus obtained is exposed to elevated temperature conditions sufficient to destruct the polyester fibre.
According to the invention, there is thus provided a method of manufactunng a filter medium, particularly for use in demisters or dust extractors, by forming a fibre glass bed and then compacting and needling it, which comprises preliminary cutting the fibre glass into 30-50 mm lengths, then soaking them at 300450 C for a time ensuring the fibrous preparation to be removed thermally. Fibre glass thus prepared is then mixed with polyesterfibres, their amount being 15-40% wt. based on the fibre glass weight, the polyester fibres having a diameter close to the fibre glass which is used.After both fibres are thoroughly mixed together, a fibrous bed is formed from them, which is then compacted so as to become 5-20 mm thick, afterwhich the bed is joined by needling it (by the well known needling procedure), and a filter medium thus obtained is then exposed to an elevated temperature barelysufficientto destructthe polyester fibre.
The filter medium obtained by the method ofthe invention may be reinforced mechanically, preferably during the fibrous bed formation, by adding a cloth or gauze made from a material which is resistant to the filter medium operating conditions, the cloth or gauze being placed either on one or on both sides of the fibrous bed, or between two such beds, and then joined using a well-known method, e.g. by quilting.
This invention will be further described with refer encetothefollowing illustrative Examples.
Example 1 1 part (weight) of fibre glass, 8Sum dia, cut into about 50 mm lengths, 2 parts (weight) of fibre glass, 10 pm dia, cut into about 40 mm lengths, 2 parts (weight) fibre glass, 15 pm, cut into about 50 mm lengths, were soaked at 4200C for 1 hour, and then polyester fibres of 15 lim dia were added, in an amount of 20% wt. based on the fibre glass. After the components were mixed together, a fibrous bed was formed, preferably in an air stream, the bed being compacted and needled on its one side, three times, as a result of which a bed was obtained which was 10 mm thick by means of 100 needlings per 1 cm2.The bed thus prepared was then burnt, the burning temperature permitting destruction of the polyester fibre additive, to obtain the filter medium.
Example 2 Fibre glass of 20 pm dia was cut into about 40 mm lengths and soaked at 450 C for 30 minutes. The fibre glass thus pretreated was then mixed with polyester fibre of 20 pm die, the amount of the polyester fibre being 30% w-. based on the fibre glass, and a fibrous bed was formed from this mixture in an air stream, the fibrous bed being hen compacted end needled twice by means of 150 needlings per 1 cm2, on both sides separately, as a result of which a fibrous bed 6 mm thick was obtained The fibrous bed thus produced was then burnt at a #emperature enabling destruction of the polyester fibre additive, after which a fibre glass cloth was applied on it and joined by quilting.
Afilter medium obtained according to the invention is very efficient and convenient in use, in particularly exhibiting an increased heat resistance and mechanical strength, as well as a structure ensuring lowerflow resistance values than those earlier assumed for such media.
1. A method of manufacturing a filter medium, wherein fibre glass cut into 30-50 mm lengths is soaked at 300-450 C for a time sufficient to remove the fibrous preparation, after which 15-40% wt. of polyesterfibre is added, the said polyester fibre having a diameter similarto that ofthefibre glass used, and wherein after both fibres are mixed together a fibrous bed is formed, the said fibrous bed being then compacted to a thickness of 5-20 mm and joined by needling,afterwhichthefiltermediumthusobtained is exposed to elevated temperature conditions suffi cientto destruct the polyester fibre.
2. A method as claimed in claim 1, wherein the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of manufacturing a filter medium This in vision relates to a method of manufacturing a filter m -m, m, particularly made from fibre glass and intended especially for demisting and dust and soot extraction from fluids at elevated temperature condi tions and with chemically corrosive material present. Known filter media used for this purpose are made from various fibres forming a felted fibrous bed placed in baskets or cassettes with openwork walls enabling he fluid to be purified to flow ti rough filter medium placed inside them. Wllen producing such filter media it is difficultto obtain a required, uniformly dense, packing bed, the fregilefibre, e.g., fibre glass, crumbling and thus adversel t affecting the flow resistances. Inorderto remove mist and dust from fluids containing chemically corrosive materials, filter media are produced from polyamide fibres, from PTFE, as well as from fibre glass coated for example with graphite or with silicones, and shaped to form a bed having a thickness as required and then undergoing needling to make its structure stable. However, filter media thus obtained are expensive andtheiruse is restricted to temperature conditions not resulting in destruction or deformation of the fibre material which they are made from. The present invention aims to overcome or at least mitigate such disadvantages by providing a method of manufacturing a filter medium which would be resistant to chemical corrosion and to elevated temperature, and which would exhibit a uniform packing density and consequently a low differentia- tion of flow resistances. The present invention provides a method of manu ï-aciuring a filter medium, wherein fibre glass cut into '!0-50 n.m lengths is soaked at 300-450 C for a time sufficient to remcvetheflbrous preparation, after which 15 405ó wt. of polyesterflbre is added, the said polyester fibre having a diameter similar to that of the fibre glass used, and wherein after both fibres are mixed .ogether a ribrous bed is formed, the said fibrous bed being then compacted a thickness of 5-20 mm and joined by needling, aftervihich the filter meatiun î thus obtained is exposed to elevated temperature conditions sufficient to destruct the polyester fibre. According to the invention, there is thus provided a method of manufactunng a filter medium, particularly for use in demisters or dust extractors, by forming a fibre glass bed and then compacting and needling it, which comprises preliminary cutting the fibre glass into 30-50 mm lengths, then soaking them at 300450 C for a time ensuring the fibrous preparation to be removed thermally. Fibre glass thus prepared is then mixed with polyesterfibres, their amount being 15-40% wt. based on the fibre glass weight, the polyester fibres having a diameter close to the fibre glass which is used.After both fibres are thoroughly mixed together, a fibrous bed is formed from them, which is then compacted so as to become 5-20 mm thick, afterwhich the bed is joined by needling it (by the well known needling procedure), and a filter medium thus obtained is then exposed to an elevated temperature barelysufficientto destructthe polyester fibre. The filter medium obtained by the method ofthe invention may be reinforced mechanically, preferably during the fibrous bed formation, by adding a cloth or gauze made from a material which is resistant to the filter medium operating conditions, the cloth or gauze being placed either on one or on both sides of the fibrous bed, or between two such beds, and then joined using a well-known method, e.g. by quilting. This invention will be further described with refer encetothefollowing illustrative Examples. Example 1 1 part (weight) of fibre glass, 8Sum dia, cut into about 50 mm lengths, 2 parts (weight) of fibre glass, 10 pm dia, cut into about 40 mm lengths, 2 parts (weight) fibre glass, 15 pm, cut into about 50 mm lengths, were soaked at 4200C for 1 hour, and then polyester fibres of 15 lim dia were added, in an amount of 20% wt. based on the fibre glass. After the components were mixed together, a fibrous bed was formed, preferably in an air stream, the bed being compacted and needled on its one side, three times, as a result of which a bed was obtained which was 10 mm thick by means of 100 needlings per 1 cm2.The bed thus prepared was then burnt, the burning temperature permitting destruction of the polyester fibre additive, to obtain the filter medium. Example 2 Fibre glass of 20 pm dia was cut into about 40 mm lengths and soaked at 450 C for 30 minutes. The fibre glass thus pretreated was then mixed with polyester fibre of 20 pm die, the amount of the polyester fibre being 30% w-. based on the fibre glass, and a fibrous bed was formed from this mixture in an air stream, the fibrous bed being hen compacted end needled twice by means of 150 needlings per 1 cm2, on both sides separately, as a result of which a fibrous bed 6 mm thick was obtained The fibrous bed thus produced was then burnt at a #emperature enabling destruction of the polyester fibre additive, after which a fibre glass cloth was applied on it and joined by quilting. Afilter medium obtained according to the invention is very efficient and convenient in use, in particularly exhibiting an increased heat resistance and mechanical strength, as well as a structure ensuring lowerflow resistance values than those earlier assumed for such media. CLAIMS
1. A method of manufacturing a filter medium, wherein fibre glass cut into 30-50 mm lengths is soaked at 300-450 C for a time sufficient to remove the fibrous preparation, after which 15-40% wt. of polyesterfibre is added, the said polyester fibre having a diameter similarto that ofthefibre glass used, and wherein after both fibres are mixed together a fibrous bed is formed, the said fibrous bed being then compacted to a thickness of 5-20 mm and joined by needling,afterwhichthefiltermediumthusobtained is exposed to elevated temperature conditions suffi cientto destruct the polyester fibre.
2. A method as claimed in claim 1, wherein the filter medium is reinforced mechanically by adding a cloth or a gauze made from a material which is resistant to the filtermedium operating conditions, the said cloth or gauze being placed either on one or on both sides ofthefibrous bed, or between two beds.
3. k. method as claimed in claim 2, wherein the said reinfomement is effected during the fibrous bed r n.
4. A method as claimed in claim 2 or 3, wherein the said cloth or gauze is joined to the said fibrous bed or beds by quilting.
5. method of manufacturing a filter medium, subsiantially as herein described in eitherofthe forergoing Examples.
GB08517077A 1985-07-05 1985-07-05 Method of manufacturing a filter medium Withdrawn GB2177127A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08517077A GB2177127A (en) 1985-07-05 1985-07-05 Method of manufacturing a filter medium
NL8502153A NL8502153A (en) 1985-07-05 1985-07-29 METHOD FOR MANUFACTURING A FILTER MEDIUM, PARTICULARLY FOR MIST AND DUST REMOVERS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08517077A GB2177127A (en) 1985-07-05 1985-07-05 Method of manufacturing a filter medium

Publications (2)

Publication Number Publication Date
GB8517077D0 GB8517077D0 (en) 1985-08-14
GB2177127A true GB2177127A (en) 1987-01-14

Family

ID=10581859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08517077A Withdrawn GB2177127A (en) 1985-07-05 1985-07-05 Method of manufacturing a filter medium

Country Status (2)

Country Link
GB (1) GB2177127A (en)
NL (1) NL8502153A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2144340A1 (en) * 1997-02-19 2000-06-01 Aplister Sa Process for manufacturing swimming-pool filters, and resulting filter
CN105365305A (en) * 2014-08-27 2016-03-02 徐珂 Glass fiber and polyester composite needle-punched felt and manufacturing method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2144340A1 (en) * 1997-02-19 2000-06-01 Aplister Sa Process for manufacturing swimming-pool filters, and resulting filter
CN105365305A (en) * 2014-08-27 2016-03-02 徐珂 Glass fiber and polyester composite needle-punched felt and manufacturing method thereof

Also Published As

Publication number Publication date
NL8502153A (en) 1987-02-16
GB8517077D0 (en) 1985-08-14

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