WO2020174263A1 - Milieu filtrant à duvet - Google Patents

Milieu filtrant à duvet Download PDF

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Publication number
WO2020174263A1
WO2020174263A1 PCT/IB2019/051589 IB2019051589W WO2020174263A1 WO 2020174263 A1 WO2020174263 A1 WO 2020174263A1 IB 2019051589 W IB2019051589 W IB 2019051589W WO 2020174263 A1 WO2020174263 A1 WO 2020174263A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
filter medium
layer
gas filter
core
Prior art date
Application number
PCT/IB2019/051589
Other languages
English (en)
Inventor
Ronie Reuben
Original Assignee
Ronie Reuben
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 Ronie Reuben filed Critical Ronie Reuben
Priority to CA3131827A priority Critical patent/CA3131827A1/fr
Priority to PCT/IB2019/051589 priority patent/WO2020174263A1/fr
Publication of WO2020174263A1 publication Critical patent/WO2020174263A1/fr

Links

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
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1258—Permeability

Definitions

  • the present invention relates to an air/gas filter medium having a substantially homogeneous core layer of feather down clusters held together by a 3-dimensional interconnected filament structure to interconnect or trap the feather down clusters and to form air pockets of various dimensions to trap undesirable substances from an air/gas flow passing through the filter medium.
  • Typical filter elements are constructed from felt materials made from a variety of materials, such as polyesters, polypropylenes, aramids and fluoropolymers and the like suitable materials. These materials are selected based on their intended use to filter undesirable particulates from an air or gas stream.
  • an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters held captive in a 3-dimensional interconnected filament structure of predetermined density suitable to filter known undesirable substances from an air/gas flow.
  • Another feature of the present invention is to provide an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters to which an air permeable scrim sheet is attached and wherein the core layer and/or scrim sheet is treated with a chemical or solution to filter impurities and/or resist to humidity in a known air/gas medium to be filtered.
  • Another feature of the present invention is to provide an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters and which is subjected to a predetermined compression to modify the density of the filament structure in which are retained the down clusters to trap known undesirable particle sizes in the miniscule air pockets formed by the down clusters and the filament structure.
  • Another feature of the present invention is to provide an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters held captive in a 3-dimensional interconnected filament structure and wherein the core layer has two or more air permeable layers of different densities adapted to trap undesirable particles of different sizes in respective ones of the layers.
  • Another feature of the present invention is to provide an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters held captive in a 3-dimensioanl interconnected filament structure and wherein the down clusters may be formed of different types of down feather clusters to modify the internal air/gas permeability of the core layer.
  • Another feature of the present invention is to provide a method of forming an air/gas filter medium comprised of a substantially homogeneous core layer formed of feather down clusters held captive in a 3-diemensional interconnected filament structure and wherein the core layer has two or more air permeable layers of different densities.
  • an air/gas filter medium comprised of a substantially homogeneous core layer of feather down clusters held together by a binder mixed with the feather down clusters.
  • the binder together with filaments of the down clusters forms a 3-dimensional interconnected filament structure throughout the core to connect and trap the clusters in the structure and to form minute pockets to trap undesirable substances.
  • An air permeable scrim sheet is retained on at least a surface of the core layer.
  • the core layer has a predetermined density obtained by control compression of the core layer for the application of the filter medium to filter known undesirable substances contained in an air/gas flow passing through the filter medium.
  • a method of forming an air/gas filter medium comprising the steps of: i) mixing a predetermined quantity of feather down clusters with a binder and depositing the mixture on a conveyor surface under movement to form a first layer of the mixture, ii) compressing the first layer of the mixture to a predetermined thickness, iii) subjecting the compressed first layer to heat treatment to activate the binder, iv) depositing a second predetermined quantity of feather down clusters mixed with a binder on a top surface of the first layer after heat treatment, v) subjecting the second layer deposited on the first layer to further compression while simultaneously compressing the first layer to form a core layer having two horizontal layers of feather down clusters having different densities, vi) further heat treating the core layers having the two horizontal layers of feather down clusters to cause the binder of the second layer to set, and vii) cooling the core layers to form an air/gas filter medium core layer having at least two horizontal air permeable layers of
  • Figure 1 is a microscopic image of a feather down cluster from a goose illustrating its structure
  • Figure 2 is an enlarged view illustrating the 3-dimensional interconnected filament structure of the feather down cluster core of the air/gas filter medium of the present invention
  • Figure 3 is a microscopic view showing particulate filtered material held captive by the miniscule air pockets and hairs of cluster filaments;
  • Figure 4 is a fragmented cross-section view showing an air/gas filter medium constructed in accordance with the present invention and wherein the scrim sheet as been shaped with a wave shape to increase the surface area of the filter medium over a predetermined area in which the filter medium is disposed;
  • Figure 5 is a cross-section view illustrating the needle point technique of fabricating an air permeable scrim sheet
  • Figure 6 is a simplified schematic view of a filter housing defining a restricted passage in which an air/gas stream is directed to filter impurities therefrom;
  • Figure 7 is a schematic illustration showing a further application of the air/gas filter medium as herein used in the construction of a face mask
  • Figure 8 is a fragmented cross-section view showing the construction of the filter medium as containing two core layers of feather down clusters compressed to different densities to create air pockets of different dimensions to trap particulate material of different sizes;
  • Figures 9A and 9B are schematic views illustrating the method of fabricating the filter medium of figure 8 with two core layers of different densities.
  • FIG. 10 there is show, generally at 10, a microscopic view of a feather down cluster. It consists of a cluster core 1 1 having a great number of filaments 12 attached to the core 1 1 and radiating in all directions about the core. Each filament 12 has a plurality of small hairs 13 radiating thereabout, as better seen from Figures 2 and 3.
  • These down clusters are in contact with a bird’s body under the thick outer feathers and they trap air molecules in small pockets to create a thermal insulating barrier. There are approximately 2 million of these filaments for every ounce of down that crisscross every which way. That is why down is known as the ultimate thermal insulating material. Geese and duck are the major sources of down insulation.
  • an air/gas filter medium 14 can be formed by fabricating a substantially homogeneous core layer 15, see Figures 4 and 5, of feather down clusters 10 held together by a binder, herein glue particles 16 mixed with binding polyester fibers 17, which bind to one another and to the filaments 12 of the feather down clusters 10 to form a 3-dimensional interconnected filament structure.
  • a filter constructed as described herein may have several applications, such as in the medical field, hospitals, factories, household uses, etc..
  • FIG. 2 illustrates the 3-dimensional interconnected filament structure of the filter medium.
  • the binding fibers 17, when heat treated, bind together at their crossings 18 and trap feather down clusters 10’, a few only being shown herein, in the pockets 19 formed by the network of criss-crossing fibers 17.
  • glue particles 16 are used in the mixture, they also adhere to the fibers 17 and the filaments 12.
  • the crisscross of the cluster filaments 12 with their tiny hairs 13 also form pockets in which microscopic particles 21 can be held captive.
  • the size of the pockets are determined by compressing the loft of the core layer 15 before the binder is set to achieve a desired density or air permeability (cfm/ft square) of the material within the core.
  • An air permeable scrim sheet 21 is also retained on a surface of the core 15 to provide added support of the filter medium 14 and to permit shaping of a sheet 23 of the medium by the use of a scrim material capable of being set to a predetermined shape by heat treatment in a die whereby to form a filter sheet having increase surface area per square inch of the core layer 15 while maintaining a constant thickness of the core layer, as shown in Figure 4.
  • the air permeable scrim sheet 21 may be formed of woven or non-woven material having air passages therethrough. Also, as shown in phantom lines 24 in Figure 4, a further scrim sheet can be attached on the opposed surface of the core layer by suitable binding means. These scrim sheets can be attached by glue or lamination on the core material before the binder sets thereby attaching the core to the scrim sheet. Further, the scrim sheet 21 can be secured to the core by needles 25 in a needle point attaching process, as is well known in the art, wherein a support 26 with a plurality of the needles 25 is caused to penetrate and retract form the scrim sheet positioned on a surface of the core layer 15.
  • the scrim sheet material can be selected from the group consisting of polypropylene, polyethylene, polyurethane, nylon, fiberglass and other suitable scrim materials.
  • the core layer 15 and/or the scrim(s) 21 , 24 can be treated with an activated carbon to destroy poisonous gas and microbes. It can also be treated with a water repellant solution for use in filtering a gas or air medium saturated with humidity. Still further, it can be treated with a disinfectant solution to form an antimicrobial barrier to kill bacteria and mould or fungus making the filter medium suitable for use it hospitals or clinics where such pathogens may be present. A fire-retardant solution may also be applied to the core layer or the scrim or both for use of the air filter medium in a hot environment where combustible gases are present in an air flow to be filtered.
  • the filter medium of the invention can be dimensioned for insertion into a square support frame 30 for support in a filter housing 31 through which an stream of air or gas to be filtered is drawn into by an impeller fan 32.
  • Several filter frames 30 can be supported spaced apart in the housing 31 whereby an air space 33 is created between the filter frames 30.
  • the stages formed by these filter frames may contain filter mediums of different densities wherein larger particles are trapped in the uppermost one 30’ of the frames which is of less density than succeeding filter frames to progressively filter out particles to a predetermined smaller size.
  • the filter frames have a longer life span for the reason that they do not get clogged quickly by letting certain particle sizes through while capturing others.
  • the filters may be identical with most particles trapped in the upper filter frame which is changed more frequently.
  • Suitable detecting means may be provided and mounted to the housing 31 , such as in the spaces 35 between the frames to monitor air flow or quality to provide information to a monitor device of the quality of the air/gas and providing an indication when it becomes necessary to change the core layers 15 of the frames 30.
  • Doors 34 provide access to the filter frames.
  • the filter arrangement herein illustrates shows filter support frames of rectangular shape, the filter medium sheet can be cut in various shapes such as circular, etc, for use in different support housing, capsules or housings.
  • the filter medium 14 of the present invention can be used in the construction of a face mask 40 and wherein the air permeable scrim sheet 21 , 24 is made from a non-woven permeable material capable of air passage and obstruction to down cluster and filaments.
  • the air permeable down material may also be mixed with substances and carriers such as the microcapsules mentioned herein above.
  • the uppermost layer of the down clusters mixed with the binder is adhered to the lowermost layer by the adhesive state of the binder in the lowermost layer or by a heat activated glue that may be applied therebetween in its fabrication process.
  • the uppermost layer 45 and the lowermost layer 46 may be formed of different feather down clusters selected from the group consisting of goose or duck down cluster, a mixture of goose or duck down cluster with tiny down feathers, and a mixture thereof with synthetic fibers in predetermined proportions to give different characteristics to the layers or to reduce cost as quality down is expensive.
  • the method comprises mixing a predetermined quantity of feather down clusters 10 and dry glue particles 16 and fibers 17 in a mixing chamber and depositing the mixture on a conveyor surface under movement in the direction of arrow 52 to form a first layer 53 of the mixture.
  • the mixture is then compressed by a compressing wall plate 54 to a predetermined thickness.
  • This compressed first layer 53 is then conveyed into a heat treatment chamber 55 to activate the binder(s).
  • a second predetermined quantity of feather down clusters 56 mixed with a binder is deposited on a top surface 57 of the first layer after heat treatment.
  • the second layer deposited on the first layer is subjected to further compression by a compression plate 56 while further compressing said first layer 53 to form a core layer having two horizontal layers of feather down clusters having different compressions.
  • the core layer having the two horizontal layers of feather down clusters is further heat treated in a controlled heat chamber 59 to cause the binder of the second layer to set.
  • the core with the two different air permeable layers is then conveyed through a cooling chamber to cool the binder to form an air/gas filter medium core having at least two horizontal air permeable layers of different densities.
  • the formed core sheet can then be rolled or cut into sheets 61 as herein illustrated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

Un milieu filtrant air/gaz est constitué d'une couche cœur sensiblement homogène de grappes de duvet maintenues ensemble par un liant pour former une structure de filament interconnecté tridimensionnelle dans tout le cœur. La structure de filament forme une poche d'air et relie et piège les grappes de duvet qui forment des poches d'air minuscules entre ses filaments et les cheveux dans lesquels des substances indésirables provenant d'un écoulement d'air/gaz à travers celles-ci sont capturées. Une feuille de canevas perméable à l'air est retenue sur une surface du cœur de grappe inférieure. Le cœur de grappe inférieure est comprimé à une densité prédéterminée pour modifier la taille moyenne desdites minuscules poches d'air pour piéger des substances indésirables connues à partir de l'écoulement d'air/gaz.
PCT/IB2019/051589 2019-02-27 2019-02-27 Milieu filtrant à duvet WO2020174263A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA3131827A CA3131827A1 (fr) 2019-02-27 2019-02-27 Milieu filtrant a duvet
PCT/IB2019/051589 WO2020174263A1 (fr) 2019-02-27 2019-02-27 Milieu filtrant à duvet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2019/051589 WO2020174263A1 (fr) 2019-02-27 2019-02-27 Milieu filtrant à duvet

Publications (1)

Publication Number Publication Date
WO2020174263A1 true WO2020174263A1 (fr) 2020-09-03

Family

ID=72239116

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/051589 WO2020174263A1 (fr) 2019-02-27 2019-02-27 Milieu filtrant à duvet

Country Status (2)

Country Link
CA (1) CA3131827A1 (fr)
WO (1) WO2020174263A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002105938A (ja) * 2000-09-28 2002-04-10 Kami Shoji Kk 天然羽毛繊維油吸着マット
US20150196145A1 (en) * 2014-01-13 2015-07-16 Ronie Reuben Thermally Insulating Stretchable Down Feather Sheet and Method of Fabrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002105938A (ja) * 2000-09-28 2002-04-10 Kami Shoji Kk 天然羽毛繊維油吸着マット
US20150196145A1 (en) * 2014-01-13 2015-07-16 Ronie Reuben Thermally Insulating Stretchable Down Feather Sheet and Method of Fabrication

Also Published As

Publication number Publication date
CA3131827A1 (fr) 2020-09-03

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