CN111133141B - Nonwoven fabric, filter using the same, and method for producing nonwoven fabric - Google Patents
Nonwoven fabric, filter using the same, and method for producing nonwoven fabric Download PDFInfo
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- CN111133141B CN111133141B CN201880062515.0A CN201880062515A CN111133141B CN 111133141 B CN111133141 B CN 111133141B CN 201880062515 A CN201880062515 A CN 201880062515A CN 111133141 B CN111133141 B CN 111133141B
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- 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
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- 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
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- 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
- D04H1/43825—Composite fibres
- D04H1/43828—Composite fibres sheath-core
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- 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
- D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5412—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
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- 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
- D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5418—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
-
- 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
- D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/542—Adhesive fibres
- D04H1/55—Polyesters
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
A nonwoven fabric body (11) constituting the nonwoven fabric (1) is formed by integrating a composite polyester fiber (2) and a flame-retardant acrylic fiber (3) as the remaining fiber. The composite polyester fiber (2) has a core-sheath structure in which the sheath part (4) is a low-melting polyester and the core part (5) is a high-melting polyester having a higher melting point than the low-melting polyester. The composite polyester fiber (2) is contained in an amount of 40 to 80 wt% based on 100 wt% of the total amount of the nonwoven fabric main body (11). The bending stiffness of the fibers of the nonwoven fabric main body (11) in the flow direction is 50-120 mN/cm, and the bending stiffness in the width direction, which is the direction perpendicular to the flow direction, is 20-100 mN/cm. With this configuration, the nonwoven fabric is formed with sufficient bonding of the fibers and strong shape retention.
Description
Technical Field
The present invention relates to a nonwoven fabric, a filter using the nonwoven fabric, and a method for producing the nonwoven fabric, and particularly to a nonwoven fabric for preventing contamination of a range hood, a ventilation fan, a ventilation port, and the like, a filter using the nonwoven fabric, and a method for producing the nonwoven fabric.
Background
Conventionally, nonwoven fabrics made of synthetic fibers have been used as filters used for preventing contamination of range hoods and ventilation fans.
For example, japanese patent application laid-open No. 2003-236320 discloses a nonwoven fabric produced by mixing a molten synthetic fiber such as a polyester fiber with a non-molten fiber such as a rayon fiber to form a fiber web (also referred to as a web sheet), and then applying a binder (adhesive or binder) for fiber-to-fiber bonding, which is made of a flame-retardant thermoplastic resin, to the fiber web by spraying or the like, and a filter using the nonwoven fabric. When a flame retardant such as a phosphorus-based water-soluble flame retardant compound is added to the binder and the filter is used as a contamination prevention filter for a range hood or a ventilation fan, the flame retardant is present in the entire nonwoven fabric of the filter, and thus the filter is not easily burned even if a fire contacts the filter.
However, in the nonwoven fabric using a binder as in jp 2003-236320 a, the binder may be applied only to the surface layer of the nonwoven fabric and may not sufficiently permeate into the inside of the nonwoven fabric, resulting in uneven flame retardancy. In addition, when the flame retardancy of the inner side is improved by sufficiently penetrating the adhesive into the inner side, a large amount of adhesive is required, which not only increases the production cost, but also may reduce the air permeability by filling or narrowing the gaps between the fibers with the adhesive. When a nonwoven fabric is used as a filter, if the air permeability is reduced, the function as a filter may be adversely affected.
Further, since such a nonwoven fabric is composed of fibers and a binder, the absolute amount of the fibers constituting the nonwoven fabric in terms of the basis weight is reduced, and when it is desired to increase the bulk of the nonwoven fabric or to enhance the so-called shape retention (shape retention associated with bending rigidity, elasticity, and the like), it is necessary to further increase the basis weight. In particular, when the nonwoven fabric is attached to a ceiling position or a slope thereof such as a range hood and has a large attachment area, if the nonwoven fabric has no shape retention property, the nonwoven fabric is bent in the middle of attachment, which may take labor and time.
Thus, jp 2006-281108 a discloses a nonwoven fabric in which fibers are bonded to each other by a bonding method such as a thermal bonding method using thermal adhesiveness of the fibers themselves constituting the nonwoven fabric, without using a binder as in jp 2003-236320 a, and a filter using the nonwoven fabric.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open No. 2003-236320
Patent document 2: japanese patent laid-open publication No. 2006-281108
However, in the case of the thermal bonding method as in patent document 2, when the thermal bonding is performed by contact heating in which the heat source body is directly contacted with the fibers, the nonwoven fabric is compressed by the heat source body, and hence the bulkiness is reduced. If the bulkiness is too low, the fiber density in the nonwoven fabric structure increases excessively, the air permeability of the nonwoven fabric decreases, the shape retention becomes too strong, and the nonwoven fabric may become hard.
Further, in the case of heat-based bonding by non-contact heating in which a heat source body is not directly contacted with fibers, such as in a hot air method (a method of blowing hot air to a web), although the nonwoven fabric is not compressed, there are cases where the fibers are not uniformly thermally bonded to each other depending on the method of blowing hot air to the web or the thermal process. In particular, when a plurality of webs are thermally bonded by non-contact heating in a state where the webs are stacked, portions where the webs are not properly bonded to each other may be generated, and the bonding force of the stacked portions is weak.
Such problems also exist for nonwoven fabrics used for applications other than pollution prevention filters such as range hoods and ventilation fans.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a nonwoven fabric having sufficient bonding between constituent fibers and strong shape retention, a filter using the nonwoven fabric, and a method for producing the nonwoven fabric.
Disclosure of Invention
In order to achieve the above object, a nonwoven fabric according to claim 1 of the present invention is a nonwoven fabric comprising conjugate polyester fibers and a remainder of other fibers, the conjugate polyester fibers having a core-sheath structure in which a sheath portion is a low-melting polyester and a core portion is a high-melting polyester having a melting point higher than that of the low-melting polyester, the nonwoven fabric comprising a nonwoven fabric main body in which the conjugate polyester fibers and the remainder of the other fibers are integrated, the nonwoven fabric main body containing 40 wt% to 80 wt% of the conjugate polyester fibers in a total amount of 100 wt% of the nonwoven fabric main body, the nonwoven fabric main body having a bending stiffness in a 1 st direction of 50mN · cm to 120mN · cm, and a bending stiffness in a 2 nd direction orthogonal to the 1 st direction of 20mN · cm to 100mN · cm.
With this configuration, the nonwoven fabric having sufficient bonding between fibers and having strong shape retention properties is obtained.
The nonwoven fabric of claim 2 is the nonwoven fabric of claim 1, wherein the nonwoven fabric has a basis weight of 40g/m 2 Above and 60g/m 2 Hereinafter, the bending stiffness ratio of the bending stiffness in the 1 st direction to the bending stiffness in the 2 nd direction (bending stiffness in the 1 st direction/bending stiffness in the 2 nd direction) is in a range exceeding 1.0 and 4.0 or less.
With this configuration, the nonwoven fabric can be easily cut into a desired size, and a desired adhesive pattern can be easily formed on a filter using the nonwoven fabric.
The nonwoven fabric according to claim 3 of the present invention has the structure according to claim 1 or 2, and the remaining portion includes the flame-retardant fibers.
With such a configuration, flame retardancy can be imparted to the nonwoven fabric.
The nonwoven fabric according to claim 4 of the present invention has the structure according to claim 3, wherein the flame-retardant fibers are flame-retardant acrylic fibers.
With such a structure, a nonwoven fabric exhibiting sufficient flame retardancy is obtained.
The nonwoven fabric according to claim 5 of the present invention has the structure according to any one of claims 1 to 4, wherein the low-melting polyester has a melting point of 100 ℃ to 140 ℃, and the composite polyester fiber contains 20 wt% to 50 wt% of the low-melting polyester in 100 wt% of the total composite polyester fiber.
With this structure, the nonwoven fabric body is sufficiently integrated.
The filter for preventing contamination of a hood or a ventilation fan according to claim 6 of the present invention is a filter for preventing contamination of a hood or a ventilation fan using the nonwoven fabric according to any one of claims 3 to 5.
With such a structure, the filter is flame retardant.
A method for producing a nonwoven fabric according to claim 7 of the present invention is a method for producing a nonwoven fabric comprising composite polyester fibers having a core-sheath structure in which a sheath portion is a low-melting polyester and a core portion is a high-melting polyester having a higher melting point than the low-melting polyester, and the remainder of other fibers, the method comprising: a preparation step of preparing a composite polyester fiber so that the total amount of fibers to be blended is 40 to 80 wt% inclusive, based on 100 wt% of the total amount of fibers to be blended; a mixing step of uniformly mixing fibers to be blended; a web forming step of forming a fiber web from the mixed fibers; a thermal bonding step of supplying the fiber web to a non-contact heating device to thermally bond fibers contained in the fiber web to obtain a non-woven fabric original material; a compression step of compressing the nonwoven fabric precursor in the thickness direction; and a reheating step of supplying the compressed nonwoven fabric precursor to a non-contact heating device to obtain a nonwoven fabric.
With this configuration, the fluffiness can be improved by the reheating step.
In the method of manufacturing a nonwoven fabric according to claim 8 of the present invention, according to the structure of the invention according to claim 7, the web forming step includes a step of laminating a plurality of fiber webs.
With this configuration, a plurality of webs in the arrangement direction can be stacked.
The method for producing a nonwoven fabric according to claim 9 of the present invention has the structure according to claim 7 or 8, and the remainder includes the flame-retardant fibers.
With such a configuration, flame retardancy can be imparted to the nonwoven fabric.
The method for producing a nonwoven fabric according to claim 10 of the present invention has the structure according to claim 9, wherein the flame-retardant fibers are flame-retardant acrylic fibers.
With this configuration, a nonwoven fabric exhibiting sufficient flame retardancy can be produced.
The method of manufacturing a nonwoven fabric according to claim 11 of the present invention has the structure according to any one of claims 7 to 10, wherein the reheating step is performed under conditions of a heating temperature of 100 ℃ to 200 ℃ and a heating time of 5 seconds to 10 minutes.
With this configuration, the bulkiness is improved stably.
As described above, the nonwoven fabric according to claim 1 of the present invention is a nonwoven fabric having sufficient bonding between fibers and strong shape retention, and therefore is suitable for the production of a filter.
The nonwoven fabric according to claim 2 of the present invention is a nonwoven fabric suitable for the production of a filter because the nonwoven fabric can be easily cut into a desired size and a desired adhesive pattern can be easily formed on a filter using the nonwoven fabric, in addition to the effects of the invention according to claim 1.
The nonwoven fabric according to claim 3 of the present invention can impart flame retardancy to the nonwoven fabric in addition to the effect of the invention according to claim 1 or 2, and therefore is suitable for producing a filter preferably having flame retardancy.
The nonwoven fabric according to claim 4 of the present invention is a nonwoven fabric which exhibits sufficient flame retardancy in addition to the effect of the invention according to claim 3, and therefore a filter having sufficient flame retardancy can be produced.
The nonwoven fabric according to claim 5 of the present invention is a nonwoven fabric more suitable for the production of a filter because it is a nonwoven fabric main body that is sufficiently integrated in addition to the effect of the invention according to any one of claims 1 to 4.
The filter for preventing contamination of the hood or the ventilation fan according to claim 6 of the present invention is a flame-retardant filter, and therefore is suitable as a filter for preventing contamination of a hood or a ventilation fan that can reach a high temperature during use.
The method for producing a nonwoven fabric according to claim 7 of the present invention can improve bulkiness through the reheating step, and therefore can produce a nonwoven fabric having high bulkiness and strong shape retention.
The method of manufacturing a nonwoven fabric according to claim 8 of the present invention is capable of laminating a plurality of webs in the arrangement direction in addition to the effect of the invention according to claim 7, and even when there is a case where fibers are dropped or penetrated in one web, dropping or penetration can be suppressed by laminating a plurality of nonwoven fabrics finally obtained. Or, by stacking a plurality of the sheets, the bulkiness and air permeability can be easily adjusted to a desired range. Moreover, the hand feeling and functionality of the nonwoven fabric can be changed on the front and back sides.
The method of manufacturing a nonwoven fabric according to claim 9 of the present invention can impart flame retardancy to the nonwoven fabric in addition to the effects of the invention according to claim 7 or 8, and therefore can obtain a nonwoven fabric suitable for manufacturing a filter preferably having flame retardancy.
The method of manufacturing a nonwoven fabric according to claim 10 of the present invention can manufacture a nonwoven fabric that exhibits sufficient flame retardancy in addition to the effect of the invention according to claim 9, and therefore can manufacture a filter having sufficient flame retardancy.
The method of manufacturing a nonwoven fabric according to claim 11 of the present invention is capable of manufacturing a nonwoven fabric having higher bulkiness and strong shape retention property, because the improvement of bulkiness is stabilized in addition to the effect of the invention according to any one of claims 7 to 10.
Drawings
Fig. 1 is a schematic view showing an enlarged structure of a part of a nonwoven fabric according to an embodiment of the present invention.
Fig. 2 is a flowchart showing a process for producing a nonwoven fabric according to an embodiment of the present invention.
Detailed Description
A nonwoven fabric according to an embodiment of the present invention is a nonwoven fabric composed of conjugate polyester fibers having a core-sheath structure in which a sheath portion is a low-melting polyester and a core portion is a high-melting polyester having a higher melting point than the low-melting polyester, and the remaining other fibers, and a nonwoven fabric body in which the conjugate polyester fibers and the remaining other fibers are integrated, the nonwoven fabric body including 40% by weight or more and 80% by weight or less of the conjugate polyester fibers in a total amount of 100% by weight of the nonwoven fabric body, the fibers of the nonwoven fabric body having a bending stiffness in a 1 st direction of 50mN & cm or more and 120mN & cm or less, and a bending stiffness in a 2 nd direction orthogonal to the 1 st direction of 20mN & cm or more and 100mN & cm or less.
With such a configuration, the nonwoven fabric is formed with sufficient bonding of the fibers and strong shape retention, and therefore, the nonwoven fabric is suitable for manufacturing a filter.
Fig. 1 is a schematic view showing an enlarged structure of a part of a nonwoven fabric according to an embodiment of the present invention.
Referring to the drawings, a nonwoven fabric main body 11 constituting the nonwoven fabric 1 is formed by integrating composite polyester fibers 2a and 2b and flame-retardant acrylic fibers 3 as other fibers in the remaining part.
The composite polyester fibers 2a and 2b are formed by coating the surface of a high-melting polyester with a polyester having a lower melting point than the polyester. That is, the composite polyester fibers 2a and 2b have a core-sheath structure in which the sheath portions 4a and 4b are made of a low-melting polyester (for example, polyethylene terephthalate having a melting point of 110 ℃; PET), and the core portions 5a and 5b are made of a high-melting polyester having a melting point higher than that of the low-melting polyester (for example, PET having a melting point of 260 ℃). The core portions 5a and 5b (high-melting polyester) are contained in an amount of 60 wt% based on 100 wt% of the total amount of the composite polyester fibers 2a and 2 b.
The composite polyester fibers 2a and 2b and the flame-retardant acrylic fiber 3 were contained in an amount of 70 wt% and 30 wt%, respectively, based on 100 wt% of the total weight of the nonwoven fabric main body 11.
Here, the nonwoven fabric main body 11 is configured by laminating a random web on a parallel web. As shown in fig. 1, a part of the surface of the sheath portion 4b of the composite polyester fiber 2b located above is fused at a joint 6a with the composite polyester fiber 2a (a state of being joined when melted and cooled during the production process).
The flame-retardant acrylic fiber 3 is uniformly contained in the entire nonwoven fabric body 11, and the flame-retardant acrylic fiber 3 is fused to a part of the surface of the sheath portion 4b of the composite polyester fiber 2b at the joint 6b with the composite polyester fiber 2 b.
In this way, the fibers constituting the nonwoven fabric main body 11 are sufficiently bonded to each other.
The bending stiffness in the flow direction of the fibers in the 1 st direction of the nonwoven fabric main body 11 was 79.1mN · cm, and the bending stiffness in the width direction in the 2 nd direction orthogonal to the flow direction was 50.0mN · cm.
The bending rigidity is a value in accordance with JIS L1913:2010"41.5 ° cantilever method" measures the calculated bending stiffness. As the bending rigidity is higher, the nonwoven fabric is more difficult to bend, and if the bending rigidity is too high, a crease may be formed in the case of passing through a folding step or the like, and the usability may be deteriorated. Further, the lower the bending rigidity, the more easily the nonwoven fabric is bent, and when the bending rigidity is too low, the nonwoven fabric may be accidentally bent and inconveniently provided on a ceiling surface, a slope thereof, or the like in use. The nonwoven fabric body 11 is suitably a nonwoven fabric having a strong shape retention property as long as it has bending rigidity in the flow direction and the width direction.
Further, the bending stiffness ratio of the bending stiffness in the flow direction to the bending stiffness in the width direction (bending stiffness in the flow direction/bending stiffness in the width direction) was 1.6.
Next, a manufacturing process for obtaining such a nonwoven fabric will be described.
Fig. 2 is a flowchart showing a process for producing a nonwoven fabric according to an embodiment of the present invention.
Referring to the drawings, step 31 is a preparation step of preparing a composite polyester fiber so that the total amount of fibers to be blended is 100 wt% and 40 wt% or more and 80 wt% or less.
The remaining part of the other fibers was prepared in an amount of 20 to 60 wt%. In the present embodiment, flame retardant acrylic fibers are used.
Raw cotton of these fibers to be blended was prepared.
Next, step 32 is a mixing step of uniformly mixing the fibers to be blended.
The raw cotton of the fibers to be blended is disentangled, and the fibers to be blended are mixed in a metered state as described above. In this way, the fibers are uniformly distributed over the entire mixed fibers.
Next, step 33 is a web forming step of forming a fiber web from the mixed fibers.
The mixed fibers are passed through a plurality of rolls or the like to form a sheet-like web. In this case, the fiber web may be formed into any of a parallel web, a random web, and a cross web. In the present embodiment, the process includes a step of forming a parallel web in which the fibers are arranged substantially in parallel and which has high strength in the flow direction, and a random web in which the fibers are arranged substantially randomly and which can improve bulkiness, and stacking a plurality of these webs.
Next, step 34 is a thermal bonding step of supplying the fiber web to a non-contact heating device to thermally bond fibers contained in the fiber web to obtain a nonwoven fabric material.
In the present embodiment, a so-called hot air method is used. That is, as the non-contact type heating device, a hot air device that blows heated air as hot air to the web is used under the conditions of the conventional method.
In this way, the low-melting polyester in the sheath portion of the composite polyester fiber contained in the fiber web is melted and solidified when cooled, and the fibers contained in the fiber web are thermally bonded to each other to obtain a nonwoven fabric original material.
Next, step 35 is a compression step of compressing the nonwoven fabric material in the thickness direction.
The nonwoven fabric precursor was wound around a rotary table and compressed into a roll.
Next, step 36 is a reheating step of supplying the compressed nonwoven fabric material to a non-contact heating device to obtain a nonwoven fabric.
The compressed nonwoven fabric precursor is unwound and heated by a hot air device under conditions of a heating temperature of 100 ℃ to 200 ℃ and a heating time of 5 seconds to 10 minutes, for example.
In this way, the nonwoven fabric of the present invention described above, which has high bulkiness and high shape retention, and in particular, which is formed by stacking a plurality of fiber webs, can have improved bonding force between fibers.
The reason why the nonwoven fabric of the present invention obtained in this way has high bulkiness and strong shape retention properties and, particularly, has a structure in which a plurality of fiber webs are stacked, the bonding strength between fibers is improved is not necessarily determined, but is presumed to be as follows.
As described above, the fibers of the nonwoven fabric original obtained by the hot air method are bonded to each other in the thermal bonding step, but at this stage, many portions where the bonding between the fibers is insufficient exist.
Therefore, when the nonwoven fabric material is compressed in the thickness direction in the compression step, the fibers are held in a bent state by applying a force to the fibers. As a result, a portion in which the fibers are in contact with each other is generated.
When the compressed nonwoven fabric precursor is reheated in the reheating step, the fibers in the bent state are activated in thermal motion, and thus the fibers are intended to return to the state before bending. On the other hand, the portions where the fibers are in contact with each other receive heat, and the low-melting polyester in the sheath portion of the composite polyester fiber is melted and bonded. That is, the number of bonding points in the nonwoven fabric after compression and reheating is larger than the number of bonding points in the original nonwoven fabric before compression. Therefore, the integrity of the nonwoven fabric due to the bonding of the fibers to each other is improved as a whole.
On the other hand, when the compressed nonwoven fabric material is reheated, the portions that are not in a state where the fibers are in contact with each other, or the portions that are in contact but are separated from each other before thermal bonding, return to the state before the fibers are bent, and therefore the bulkiness returns.
From such a mechanism, it is presumed that the nonwoven fabric of the present invention has excellent properties.
The nonwoven fabric of the present invention has flame retardancy due to the inclusion of the flame-retardant fiber, and therefore can be suitably used as a filter for preventing contamination of a range hood or a ventilation fan.
Further, as a filter for preventing contamination in a range hood, a ventilation fan, or the like, the thickness of the nonwoven fabric is preferably in the range of 0.2mm to 20.0mm, and more preferably in the range of 2.5mm to 8.0 mm. When a filter is used in a range hood, a ventilation fan, or the like, air containing oil stains is filtered by the nonwoven fabric of the filter, and therefore such nonwoven fabric is preferably high in air permeability and bulkiness. When the thickness of the nonwoven fabric is within the above numerical range, the air permeability and bulkiness can be achieved at the same time, and the nonwoven fabric can be used more suitably as a filter for preventing contamination, such as a range hood or a ventilation fan.
Next, step 37 is a folding-in step and a winding-up step of forming the nonwoven fabric into a desired shape as needed.
First, the nonwoven fabric is cut into a desired length and width by a cutting device. The cut nonwoven fabric is then gathered in a desired number, folded by a folding device, or wound into a roll by a winding device, and formed into a shape convenient for distribution or product sale.
In the above-described embodiment, the nonwoven fabric is constituted only by the nonwoven fabric main body, but the nonwoven fabric (or the nonwoven fabric structure) may be constituted by forming the nonwoven fabric main body made of blended fibers, applying an adhesive in a predetermined pattern to the surface thereof, or preparing a separate film to which the adhesive in the predetermined pattern is applied separately, and then overlapping the surface of the separate film on which the adhesive is applied with the nonwoven fabric main body, for example, to transfer the adhesive to the nonwoven fabric main body. That is, the nonwoven fabric main body is a portion of the nonwoven fabric which substantially serves as a base, and is composed of fibers to be blended (the composite polyester fibers and the remaining fibers).
In the above-described embodiments, the predetermined PET is used for both the low-melting point polyester and the high-melting point polyester, but the polyester is a polymer substance having an ester bond in the molecule, and examples thereof include, in addition to PET, polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and the like. In addition, different types of polyesters can be used for the low-melting point polyester and the high-melting point polyester. In addition, in order to improve the properties of the fiber, a copolymer component may be contained in the polymer structure.
In the above embodiment, the melting point of the low-melting polyester is 110 ℃, and the melting point is preferably 100 ℃ or higher and 140 ℃ or lower, and more preferably 110 ℃ or higher and 120 ℃ or lower. In this case, the composite polyester fiber preferably contains 20 wt% to 50 wt% of the low-melting polyester, and more preferably 30 wt% to 45 wt% of the low-melting polyester, based on 100 wt% of the total amount of the composite polyester fiber.
With this configuration, the fibers are sufficiently bonded to each other to form a nonwoven fabric body that is sufficiently integrated, and therefore, the nonwoven fabric is more suitable for the production of a filter.
In the above embodiment, the melting point of the high-melting polyester is 260 ℃, but the melting point may be higher than that of the low-melting polyester, that is, the low-melting polyester may be melted and the high-melting polyester may not be substantially melted in the thermal bonding step for integration.
In the above embodiment, the core-sheath structure in which the high-melting polyester is directly covered with the low-melting polyester is configured, but the core-sheath structure is substantially included in the present invention even if the structure of another composite fiber is, for example, a structure in which the core portion is divided into a plurality of portions and covered with the sheath portion, or a structure in which the core portions are arranged side by side.
In the above embodiment, flame-retardant acrylic fibers are used as the flame-retardant fibers, but other flame-retardant fibers such as flame-retardant polyester fibers may be used. That is, the remaining portion contains flame retardant fibers. With such a configuration, flame retardancy can be imparted to the nonwoven fabric, and therefore, the nonwoven fabric is suitable for manufacturing a filter preferably having flame retardancy.
The flame-retardant acrylic fiber is an acrylic fiber (synthetic fiber mainly made of acrylonitrile) having flame retardancy. For example, there are acrylic synthetic fibers having self-extinguishing properties such as acrylic fibers obtained by blending and kneading a flame retardant, and containing a halogen such as chlorine in the composition and extinguishing a fire in the atmosphere by releasing a halogen-based gas during combustion (modified acrylic fibers (japanese patent No. \12514124801245012512512512522330). By using such flame retardant acrylic fibers as the flame retardant fibers, a nonwoven fabric exhibiting sufficient flame retardancy is obtained, and therefore, a filter having sufficient flame retardancy can be manufactured.
The remainder may contain other fibers as well as the flame-retardant fibers. For example, rayon fibers, polyvinyl alcohol (PVA) fibers, and the like can be cited, and when these fibers are contained as other fibers, the sagging (dripping) of the molten resin during combustion can be prevented.
The remaining part may be made of other fibers without containing the flame-retardant fiber. Even in the case of such a configuration, the nonwoven fabric can be suitably used as a nonwoven fabric for a filter that does not require flame retardancy, such as a filter for a ventilation port. The other fibers may be a single type of fiber or a plurality of types of fibers.
The substance having flame retardancy means a substance which is difficult to ignite by itself and has a low combustion rate in the case of ignition, preferably has a property of preventing combustion diffusion, and preferably satisfies classification 3 based on the combustibility test according to JACA No. 11A-2003.
In the above embodiment, the composite polyester fiber is contained in an amount of 70 wt% based on 100 wt% of the total amount of the nonwoven fabric main body, but may be contained in an amount of 40 wt% to 80 wt%. With this configuration, the fibers are sufficiently bonded to each other.
In the above-described embodiment, the flow direction is used as the 1 st direction of the nonwoven fabric main body, but the 1 st direction is a direction having the highest bending stiffness in the nonwoven fabric main body (including a state of being a nonwoven fabric or a filter), and is usually a production direction (machine direction) of the nonwoven fabric, that is, a longitudinal direction or a flow direction. The 2 nd direction is a direction orthogonal to the 1 st direction, and is usually a lateral direction or a width direction.
In the above-described embodiment, the bending rigidities in the flow direction and the width direction of the nonwoven fabric main body are specific values, but the bending rigidity in the 1 st direction of the nonwoven fabric main body is preferably 50mN · cm or more and 120mN · cm or less, and the bending rigidity in the 2 nd direction, which is a direction orthogonal to the 1 st direction, is preferably 20mN · cm or more and 100mN · cm or less.
In the above-described embodiment, the bending stiffness ratio (bending stiffness in the flow direction/bending stiffness in the width direction) of the bending stiffness in the flow direction (1 st direction) to the bending stiffness in the width direction (2 nd direction) is 1.6, but is preferably in a range of more than 1.0 and 4.0 or less. When the bending stiffness ratio is greater than 1.0, the bending stiffness in the flow direction is higher than the bending stiffness in the width direction, and when the nonwoven fabric is cut in the manufacturing process while applying a certain degree of pulling force in the flow direction, the fibers are hard to stretch in the flow direction of the nonwoven fabric, and therefore, the dimensional change after cutting is relatively small, and the nonwoven fabric is easily cut into an intended size. When the bending stiffness ratio is 4.0 or less, the bending stiffness in the flow direction is not excessively higher than the bending stiffness in the width direction, and when a bonding process is performed on the nonwoven fabric while applying a certain degree of pulling force in the flow direction, the fibers are less likely to contract in the width direction of the nonwoven fabric, and thus a desired bonding pattern is easily formed. Therefore, the nonwoven fabric is suitable for manufacturing a filter having such a cutting/bonding pattern. Of course, the bending stiffness ratio may also be 1.0. In order to fully exhibit such an effect, the weight per unit area of the nonwoven fabric main body is preferably 40g/m 2 Above and 60g/m 2 The following.
In the above-described embodiment, the nonwoven fabric main body is configured by laminating a fiber web of a parallel web and a fiber web of a random web, but a plurality of fiber webs may be laminated, which are arbitrarily selected from parallel webs, random webs, cross webs, and the like. With this configuration, a plurality of webs in the arrangement direction can be stacked. Thus, even when fibers are peeled off or penetrated through one web, the nonwoven fabric finally obtained by stacking a plurality of the webs can suppress the peeling off or the penetration, or can easily adjust the bulkiness and the air permeability to desired ranges, and can change the texture and the functionality of the nonwoven fabric on the front and back sides.
The nonwoven fabric main body may be formed of, for example, different kinds of webs (parallel web, random web, and the like) stacked as in the present embodiment, the same kind of webs (random web, and the like) stacked, or a single kind of web without being stacked. Compared to a parallel web, a nonwoven fabric body including a plurality of random webs stacked thereon is subjected to a thermal bonding step and a reheating step, and thus has an increased number of bonding points per unit area weight, thereby improving bulkiness. In this way, the adjustment of the properties such as bulkiness can be performed.
In the above embodiment, the flame-retardant acrylic fiber is prepared in addition to the composite polyester fiber in the preparation step, but at least the composite polyester fiber and the rest of the fibers may be prepared.
In the above-described embodiment, the fibers to be blended are uniformly mixed in the mixing step, but the fibers may be dispersed as a whole to such an extent that the fibers are considered to be substantially uniform.
In the above-described embodiment, hot air devices are used as the non-contact heating devices in the thermal bonding step and the reheating step, respectively, but any method may be used as long as the heat source body does not contact the web to be heated.
In the above-described embodiment, the reheating step is performed under the conditions of the predetermined heating temperature and heating time, but may be performed under other conditions. The reheating step is preferably performed under the above-described predetermined conditions, and thus, since the improvement of bulkiness is stabilized, a nonwoven fabric having higher bulkiness and strong shape retention can be produced. The heating temperature in the reheating step is more preferably higher than the melting point of the low-melting polyester used.
In addition, as described above, the nonwoven fabric obtained in the reheating step may be coated with an adhesive or the like or printed in a desired pattern.
In the above-described embodiment, the nonwoven fabric is produced by a specific production method, but may be produced by another production method.
Examples
The present invention will be specifically described below based on examples. The embodiments of the present invention are not limited to the examples.
Test bodies of examples and comparative examples of the present invention were prepared, and a bending stiffness test for measuring bending stiffness and a combustibility test for evaluating performance during combustion were performed on these test bodies.
[ Structure of test body ]
Nonwoven fabrics (filters) of examples 1 to 7, comparative examples 1 to 4, and reference example 1 having the structures shown in table 1 below were prepared as test bodies.
[ Table 1]
In the table, the unit "d" of the fiber diameter is a denier.
The units of numerals in the tables are g/m except for the specific units 2 。
The blank column in the table indicates that the fiber type is not substantially included. In the reheating step in the table, "-" in comparative examples 1 to 4 indicates that the reheating step cannot be assumed since they are configured by using a method in which fibers are bonded to each other with a binder.
The "resin/flame retardant (adhesive agent)" in the table refers to a material obtained by blending a halogen-based flame retardant into a thermoplastic resin to impart a function as an adhesive agent for bonding fibers to each other and a flame-retardant function during combustion.
In the table, "low-melting PET" in the sheath portion of the "composite PET fiber" is a PET fiber having a melting point of 110 to 140 ℃.
Examples 1 to 7 were prepared using the above-described production method of the present invention. That is, the nonwoven fabrics of examples 1 to 7 are those obtained by obtaining a nonwoven fabric material by a hot air method, and then improving the bulkiness and the strength of the shape retention property through a compression step and a reheating step.
Reference example 1 was prepared in the state of a nonwoven fabric original without performing a reheating step, similarly to the fiber type structure of example 1.
In addition, comparative examples 1 to 4 are all conventional nonwoven fabrics (commercially available products) using a binder.
[ bending rigidity test and Smoke exhaust ventilator installation test ]
For the test pieces prepared as above, first, as a bending rigidity test, a bending length (unit: length) was measured in accordance with JIS-L-1096A method "45 ° cantilever method", and a bending rigidity was measured in accordance with JIS L1913: the bending stiffness (unit: mN. Cm) was calculated by 2010"41.5 ℃ cantilever method".
Further, a range hood attachment test was performed to confirm the attachment to the range hood.
First, a filter in a state immediately after each test piece was cut into a test piece size of 60cm × 36cm was prepared as a "before-bending" test piece, and then a test piece after 1 month was stored by packaging the filter of each test piece in a three-folded state in a 60cm direction was prepared as a "1 month-after-bending" test piece.
The filters of these test pieces were attached to a range hood of "BDR-3HL-601BK" manufactured by Fuji Industrial Co., ltd, and the attachment was confirmed.
The results are shown in table 2 below.
[ Table 2]
The bending stiffness is calculated by the following equation.
G＝m×C 3 ×10 -3
In the formula, G: flexural rigidity (mN · cm), m: mass per unit area (g/m) of test piece 2 ) I.e., weight per unit area, C: overall average bend length (cm). In addition, in this formula, 9.81m/s 2 Is approximately 10m/s 2 。
In addition, as an evaluation of the attachment to the hood, "o" before bending in the table indicates that the filter has appropriate shape retention and is suitable for attachment to the hood, and "x" indicates that the filter has no shape retention and is not suitable for attachment to the hood. Further, "o" 1 month after bending "indicates that there is no gap between the filter and the hood when attached to the hood, or that the gap is small, and therefore it is appropriate, and" x "indicates that a fold remains in the filter, and therefore a gap is generated between the filter and the hood when attached to the hood, and therefore it indicates that it is not appropriate.
Referring to Table 2, the flexural rigidities in the flow directions of examples 1 to 7 were 79.1 mN.cm, 51.5 mN.cm, 69.1 mN.cm, 54.7 mN.cm, 89.9 mN.cm, 73.5 mN.cm, and 117.2 mN.cm, respectively, and the flexural rigidities in the width directions were 50.0 mN.cm, 20.3 mN.cm, 42.4 mN.cm, 51.8 mN.cm, 22.9 mN.cm, 20.6 mN.cm, and 98.6 mN.cm, respectively. Therefore, it was confirmed that the nonwoven fabric of the present invention has a bending stiffness of 50mN · cm or more and 120mN · cm or less in the 1 st direction and a bending stiffness of 20mN · cm or more and 100mN · cm or less in the 2 nd direction, which is a direction orthogonal to the 1 st direction, unlike conventional nonwoven fabrics (comparative examples 1 to 4).
The bending stiffness ratios (bending stiffness in the flow direction/bending stiffness in the width direction) of examples 1 to 7 were 1.6, 2.5, 1.6, 1.1, 3.9, 3.6, and 1.2, respectively. In each of examples 1 to 7, the ease of attachment to the range hood was "before bending" or "1 month after bending" (suitable). Therefore, it was confirmed that the nonwoven fabric and the filter of the present invention have a bending stiffness ratio of bending stiffness in the 1 st direction to bending stiffness in the 2 nd direction of more than 1.0 and 4.0 or less, and that the filter based on the nonwoven fabric having such a bending stiffness ratio has strength suitable for shape retention and is suitable for attachment to a range hood.
Further, it was confirmed by comparing example 1 with reference example 1 that, in the case where the reheating step is not performed in the manufacturing step as in reference example 1, the bending rigidities in the flow direction and the width direction are lower than those in example 1, and the mountability to the hood before bending is not appropriate, but in the case where the reheating step is performed in the manufacturing step as in example 1, the bending rigidities in the flow direction and the width direction are both within a preferable range, and the mountability to the hood before bending is also preferable.
[ flame retardancy test ]
Flame retardancy tests for evaluating performances and the like during combustion were performed using examples 1 to 7 and conventional comparative example 2 having the same weight per unit area as example 1, containing a binder and having flame retardancy.
The results are shown in table 3 below.
[ Table 3]
In the table, "flame retardancy" represents the performance evaluated in accordance with the JACA No.11A-2003 combustion test.
In the table, "flame (Japanese: 12501125211250524)" shows that the molten resin fell as a ball when each test piece was burned.
In the table, "the ignition test for lighter" indicates the ignition method in which each test piece was cut into an elongated shape and had one end, and the flame of the lighter was brought close to the test piece a plurality of times from the other end side and evaluated. Further, "no uneven burning" means that no burning was caused at any test site and the flame retardancy was good, and "uneven burning" means that burning was caused at least one test site and the flame retardancy was uneven and poor.
In the table, "air permeability" means the air permeability (cc/cm) measured in accordance with JIS-L-1913 Frazier type 2 /sec)。
In the table, "thickness" is 0.8g/cm 2 The average thickness of the nonwoven fabric measured under the load of (3) is a factor relating to bulkiness.
In the table, "peeling of the surface fastener" indicates the performance of the surface fastener when the nonwoven fabric attached to the installation site is detached, and is evaluated from the viewpoint that the nonwoven fabric is not broken at the time of detachment and the viewpoint that the fibers of the nonwoven fabric are not attached to the surface fastener side, based on comparative example 2.
From the results of "flame retardancy" in table 3, it was confirmed that the flame retardancy of examples 1 to 7 each having a structure containing a flame-retardant acrylic fiber satisfies classification 3, i.e., has flame retardancy, as in comparative example 2.
From the results of the "burn-and-flame test", it was confirmed that in all of examples 1 to 7, as in comparative example 2, no drop occurred in which the molten resin fell as a ball during combustion.
Furthermore, it was confirmed from the results of the "flame spread test in lighter" that in all of examples 1 to 7, there was no spread of flame spread during combustion, and the flame retardancy of the nonwoven fabric as a whole was better than that of comparative example 2.
From the results of "air permeability" and "thickness", it was confirmed that in all of examples 1 to 7, the air permeability and bulkiness as a filter were sufficiently ensured in the same manner as in comparative example 2.
From the results of "peeling of the surface-adhesive agent", it was confirmed that the surface-adhesive agent of examples 1 to 7 can be attached and detached satisfactorily even when the surface-adhesive agent is used for installation, as in comparative example 2.
Industrial applicability
As described above, the nonwoven fabric of the present invention, the filter using the same, and the method for producing the nonwoven fabric are suitable for preventing contamination of, for example, a range hood or a ventilation fan.
Claims (13)
1. A nonwoven fabric (1) comprising a composite polyester fiber (2) and the remaining other fibers (3), the composite polyester fiber (2) having a core-sheath structure in which a sheath portion (4) is a low-melting polyester and a core portion (5) is a high-melting polyester having a melting point higher than that of the low-melting polyester,
the nonwoven fabric is provided with a nonwoven fabric main body (11) formed by integrating the composite polyester fiber and the rest of other fibers,
the nonwoven fabric main body contains the composite polyester fiber in an amount of 40 to 80 wt% based on 100 wt% of the total amount of the nonwoven fabric main body,
the nonwoven fabric body has a bending stiffness in a 1 st direction of 50mN · cm or more and 120mN · cm or less, and a bending stiffness in a 2 nd direction, which is a direction orthogonal to the 1 st direction, of 20mN · cm or more and 100mN · cm or less, the bending stiffness being measured in accordance with JIS L1913:2010"41.5 ° cantilever method", the 1 st direction is a flow direction of the nonwoven fabric main body, the 2 nd direction is a width direction of the nonwoven fabric main body,
the nonwoven fabric is used as a filter for preventing contamination of a range hood or a ventilation fan.
2. The nonwoven fabric according to claim 1,
the weight per unit area of the non-woven fabric body is 40g/m 2 Above and 60g/m 2 In the following, the following description is given,
the bending stiffness in the 1 st direction/the bending stiffness in the 2 nd direction, which is a bending stiffness ratio of the bending stiffness in the 1 st direction to the bending stiffness in the 2 nd direction, is in a range of more than 1.0 and 4.0 or less.
3. The nonwoven fabric according to claim 1 or 2,
the remainder comprises flame retardant fibers.
4. The nonwoven fabric according to claim 3,
the flame-retardant fiber is flame-retardant acrylic fiber.
5. The nonwoven fabric according to claim 1, 2 or 4,
the melting point of the low-melting polyester is more than 100 ℃ and less than 140 ℃,
the composite polyester fiber contains 20 to 50 wt% of the low-melting polyester in 100 wt% of the total amount of the composite polyester fiber.
6. The nonwoven fabric according to claim 3,
the melting point of the low-melting-point polyester is more than 100 ℃ and less than 140 ℃,
the composite polyester fiber contains 20 to 50 wt% of the low-melting polyester in 100 wt% of the total amount of the composite polyester fiber.
7. A filter for preventing pollution of a range hood or a ventilation fan is characterized in that,
the filter uses the nonwoven fabric according to any one of claims 3 to 6.
8. A method for producing a nonwoven fabric (1) comprising a composite polyester fiber (2) and the remaining other fibers (3), the composite polyester fiber (2) having a core-sheath structure in which a sheath portion (4) is a low-melting polyester and a core portion (5) is a high-melting polyester having a melting point higher than that of the low-melting polyester,
the method for manufacturing the non-woven fabric comprises the following steps:
a preparation step (31) for preparing the composite polyester fiber so that the total amount of the fibers to be blended is 40 to 80 wt% inclusive, based on 100 wt%;
a mixing step (32) for uniformly mixing the fibers to be blended;
a web forming step (33) for forming a fiber web from the mixed fibers;
a thermal bonding step (34) in which the fiber web is fed to a non-contact heating device to thermally bond the fibers contained in the fiber web to obtain a nonwoven fabric precursor;
a compression step (35) which is performed after the thermal bonding step and compresses the nonwoven fabric original in the thickness direction; and
and a reheating step (36) for supplying the compressed nonwoven fabric precursor to a non-contact heating device to obtain a nonwoven fabric (1).
9. The method of manufacturing a nonwoven fabric according to claim 8,
the web forming step includes a step of stacking a plurality of the fiber webs.
10. The method for producing a nonwoven fabric according to claim 8 or 9,
the remainder comprises flame retardant fibers.
11. The method of manufacturing a nonwoven fabric according to claim 10,
the flame-retardant fiber is flame-retardant acrylic fiber.
12. The method of producing a nonwoven fabric according to any one of claims 8, 9, and 11,
the reheating step is performed under conditions in which the heating temperature is 100 ℃ to 200 ℃ inclusive and the heating time is 5 seconds to 10 minutes inclusive.
13. The method of producing a nonwoven fabric according to claim 10,
the reheating step is performed under conditions in which the heating temperature is 100 ℃ to 200 ℃ inclusive and the heating time is 5 seconds to 10 minutes inclusive.
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| JP2017191141 | 2017-09-29 | ||
| PCT/JP2018/035863 WO2019065807A1 (en) | 2017-09-29 | 2018-09-27 | Nonwoven fabric, filter using same, and nonwoven fabric manufacturing method |
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| CN114622341A (en) * | 2020-12-15 | 2022-06-14 | 浙江青昀新材料科技有限公司 | Polyethylene non-woven fabric and application thereof |
| CN114687063A (en) * | 2020-12-30 | 2022-07-01 | 无锡市正龙无纺布有限公司 | Preparation method of laminated range hood filter screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60168000A (en) * | 1984-02-10 | 1985-08-31 | 帝人株式会社 | Drape like wet nonwoven fabric |
| JPH0768663B2 (en) * | 1987-08-25 | 1995-07-26 | 東洋紡績株式会社 | Surface material for sanitary goods |
| JPH0531310A (en) * | 1991-08-02 | 1993-02-09 | Toray Ind Inc | Filter medium having pleating property and fire retardant property |
| JP3269103B2 (en) * | 1992-01-31 | 2002-03-25 | 東レ株式会社 | Flame retardant filter media |
| JP3109629B2 (en) * | 1992-09-30 | 2000-11-20 | チッソ株式会社 | Polyolefin core-sheath type composite fiber and nonwoven fabric using the same |
| JP2001271257A (en) * | 2000-03-17 | 2001-10-02 | Teijin Ltd | Thin layer nonwoven fabric having excellent bulk recovery property |
| JP2002263043A (en) * | 2001-03-08 | 2002-09-17 | Daiwabo Co Ltd | Nonwoven fabric for wiping |
| JP2006241642A (en) * | 2005-03-04 | 2006-09-14 | Solotex Corp | Bulky soft airlaid nonwoven fabric |
| JP2008045241A (en) * | 2006-08-17 | 2008-02-28 | Toray Ind Inc | Heat-adhesive conjugate fiber and fiber assembly |
| JP5027688B2 (en) * | 2008-02-25 | 2012-09-19 | 帝人ファイバー株式会社 | Flexible nonwoven fabric |
| JP2013085541A (en) * | 2011-10-21 | 2013-05-13 | Towa Orimono Kk | Tile mat for pet |
| JP5948214B2 (en) * | 2011-11-07 | 2016-07-06 | 花王株式会社 | Thermally extensible fiber and non-woven fabric using the same |
| KR101180374B1 (en) * | 2012-03-12 | 2012-09-10 | 동화 바이텍스 주식회사 | Environment friendly non-woven for engine filter, method for manufacturing the same and engine filter comprising the same |
| CN103422254B (en) * | 2012-05-23 | 2018-01-02 | 东丽纤维研究所（中国）有限公司 | One kind heat bonding non-woven fabrics and its production method and purposes |
| CN103866485B (en) * | 2012-12-11 | 2017-07-28 | 东丽纤维研究所（中国）有限公司 | One kind heat bonding non-woven fabrics and its production method and purposes |
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| WO2019065807A1 (en) | 2019-04-04 |
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