JP6524520B2 - Method and apparatus for manufacturing laminate - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a laminate including a non-woven fabric formed by an electrospinning method, and more particularly to an improvement in the uniformity of drying of non-woven fabric.

  In the electrospinning method, for example, while applying a high voltage to a raw material solution in which a resin is dissolved in a solvent, fibers are formed by injecting a charged raw material solution from a nozzle (see Patent Document 1). The electrospinning method has attracted attention as a method capable of relatively easily producing fibers generally called nanofibers, in which the fiber diameter is 1 μm or less. The fibers produced and deposited by the electrospinning method are point-bonded at the contact portion. A non-woven fabric is formed by point bonding of a plurality of fibers.

JP, 2008-179916, A

  In the electrospinning method, the solvent of the raw material solution is volatilized in the process from the injection of the raw material solution to the deposition of the fibers. However, it is necessary to leave a small amount (e.g., 5 to 10% by mass) of a solvent in the fibers to be spun in order to point-bond the fibers. By the solvent remaining in the fibers, the adhesion between the contacted fibers is improved. By drying the fibers in this state, the closely adhered fibers are point-bonded to each other.

  Therefore, the non-woven fabric obtained by depositing fibers by the electrospinning method is usually subjected to a drying process. If the solvent remains inside the fiber after the drying process, the solvent inside the nonwoven fabric may exude to the fiber surface during use of the nonwoven fabric and may volatilize, causing a problem. Therefore, the nonwoven fabric is required to be uniformly dried to the inside. The drying device used to dry the non-woven fabric generally vaporizes the solvent by applying thermal energy to the air and convecting the air into contact with the solvent. However, in such a drying method, it may be difficult to uniformly dry the entire surface of the non-woven fabric.

  According to one aspect of the present invention, there is provided a raw material solution containing a raw material resin as a raw material for fibers and a solvent for dissolving the raw material resin, a first step of preparing a first sheet, and electrospinning from the raw material solution In the second step of producing a fiber containing the raw material resin and the solvent, depositing the fiber on one of the main surfaces of the first sheet to form a non-woven fabric, and a heating device that emits an electromagnetic wave And a third step of removing at least a part of the solvent contained, wherein the non-woven fabric comprises an end Tf including an end face thereof and a central part Cf other than the end, the electromagnetic wave The present invention relates to a method for manufacturing a laminate, in which a reflector that reflects the electromagnetic wave is disposed so as to reflect the non-woven fabric from the opposite side to the heating device toward the end Tf.

  According to another aspect of the present invention, a fiber containing the raw material resin and the solvent is produced from a raw material liquid containing a raw material resin as a raw material of fibers and a solvent for dissolving the raw material resin by electrospinning. A non-woven fabric forming part that deposits a fiber on one main surface of the first sheet to form a non-woven fabric; and a drying part that removes at least a part of the solvent contained in the fiber by a heating device that emits an electromagnetic wave; The non-woven fabric is provided with an end Tf including the end face thereof and a central portion Cf other than the end, and the electromagnetic wave is applied to the end Tf from the side opposite to the heating device of the non-woven fabric. The manufacturing apparatus of a laminated body provided with the reflecting plate which is reflected toward.

  ADVANTAGE OF THE INVENTION According to this invention, when manufacturing the laminated body containing the nonwoven fabric formed of the electrospinning method, a nonwoven fabric can be dried uniformly.

It is the schematic explaining the manufacturing method which concerns on one Embodiment of this invention. It is sectional drawing which shows typically a mode that the arrangement | positioning of the reflective plate which concerns on one Embodiment of this invention was seen from the conveyance direction of the nonwoven fabric. It is sectional drawing explaining the edge part and center part of a nonwoven fabric. It is sectional drawing explaining the edge part and center part of a heating apparatus. It is sectional drawing which shows typically a mode that the arrangement | positioning of the shielding board which concerns on one Embodiment of this invention was seen from the conveyance direction of the nonwoven fabric. It is the schematic explaining the manufacturing method which concerns on other one Embodiment of this invention. It is the schematic explaining the manufacturing method which concerns on other one Embodiment of this invention. It is the schematic explaining the manufacturing apparatus which concerns on one Embodiment of this invention. It is a graph which shows the transmittance | permeability with respect to the water of each wavelength.

  The method for producing a laminate according to the present invention comprises: a raw material solution containing a raw material resin as a raw material of fibers and a solvent for dissolving the raw material resin; a first step of preparing a first sheet; The solvent contained in the fibers by the second step of forming fibers containing the raw material resin and the solvent from the liquid and depositing the fibers on one of the main surfaces of the first sheet to form a non-woven fabric, and a heating device that emits electromagnetic waves. And a third step of removing at least a portion of At this time, the non-woven fabric is provided with an end Tf including the end face and a central portion Cf other than the end, so that the electromagnetic wave is reflected from the opposite side to the heating device of the non-woven fabric toward the end Tf. , A reflector for reflecting an electromagnetic wave is disposed. Thereby, the heating nonuniformity is suppressed and the nonwoven fabric is dried uniformly.

  The end Tf is preferably disposed between the reflective plate and the heating device in that drying is performed more uniformly. In terms of heating efficiency, the reflecting plate is preferably disposed vertically below the end portion Th of the heating device.

  It is preferable that the shortest distance Lh from the main surface facing the heating device of the non-woven fabric to the heating device and the shortest distance Lr from the main surface facing the reflecting plate of the non-woven fabric to the reflecting plate satisfy the relationship of Lh <Lr. This can suppress excessive heating of the end Tf and a rapid temperature rise.

  Before the second step, the first sheet may be supplied to the transport unit. As a result, in the second step, the nonwoven fabric is formed on the main surface of the first sheet being conveyed by the conveyance unit, so that the production efficiency is improved.

  Furthermore, it is preferable that a shielding plate that shields part of the electromagnetic wave be disposed between the central portion Cf and the heating device. Thereby, the heating unevenness is easily suppressed, and the drying of the non-woven fabric is performed more uniformly. At this time, the shielding plate is preferably disposed between the central portion Cf and the central portion Ch of the heating device.

  The heating device preferably emits far infrared radiation. This is because the drying efficiency is improved.

  The far infrared radiation preferably includes a first wavelength of 50% or more of the transmittance to the raw material resin. This is because the solvent is easily removed uniformly from the fiber.

  The transmittance of the first wavelength to water is preferably 75% or more. It is because the removal of the solvent is performed more efficiently. Such a first wavelength is, for example, 2.5 μm or more and 5.5 μm or less.

  After the second step, before the third step, a fourth step of applying an adhesive to the nonwoven fabric may be included. At this time, when the heating device emits far infrared radiation, the far infrared radiation preferably includes a second wavelength of 50% or more and 95% or less of the transmittance to the adhesive. Even when the adhesive is interposed between the heating device and the non-woven fabric, it is possible to heat the solvent inside the fiber, and the solvent is easily removed uniformly. In this case, it is preferable that the fifth step of laminating the second sheet on the non-woven fabric to which the adhesive is applied be performed after the third step in terms of drying efficiency.

  The transmittance of the second wavelength to water is preferably 75% or more. It is because the removal of the solvent is performed more efficiently. Such a second wavelength is, for example, 2.5 μm or more and 5.5 μm or less.

  It is preferable that the fiber diameter of the said fiber after a 3rd process is 1 micrometer or less. This makes it easier to remove the solvent inside the fiber more uniformly.

  The apparatus for producing a laminate according to the present invention produces fibers containing a raw material resin and a solvent from a raw material liquid containing a raw material resin to be a raw material of fibers and a solvent for dissolving the raw material resin by electrospinning. A non-woven fabric forming portion that forms a non-woven fabric by being deposited on one of the main surfaces of the first sheet, and a drying portion that removes at least a part of the solvent contained in the fibers by a heating device that emits electromagnetic waves. At this time, the non-woven fabric has an end Tf including the end face and a central portion Cf other than the end, and reflects the electromagnetic wave from the opposite side to the heating device of the non-woven fabric toward the end Tf. Prepare. Thereby, the nonwoven fabric is dried uniformly.

First Embodiment
Hereinafter, one embodiment of a manufacturing method according to the present invention will be described with reference to FIGS. In the present embodiment, the first sheet 2 is supplied to the transport unit 3, and the processes after the second process are continuously performed on the first sheet 2 transported in the transport direction D. However, the present invention is not limited to this, and the second step may be performed on the first sheet 2 to be conveyed, and the subsequent steps may be performed on the first sheet which has been left standing. And all the steps after the second step may be performed on the stationary first sheet.

  FIG. 1 is a schematic view for explaining the manufacturing method according to the first embodiment of the present invention. The laminate 10 obtained by this method is constituted by the nonwoven fabric 1 and the first sheet 2. FIG. 2 is a cross-sectional view schematically showing the arrangement of the reflection plate 5 as viewed from the conveyance direction D of the nonwoven fabric 1. FIG. 3 is a cross-sectional view for explaining the end portion Tf and the central portion Cf of the nonwoven fabric 1. FIG. 4 is a cross-sectional view for explaining the end portion Th and the central portion Ch of the heating device 4.

(1) First Step In the first step, a raw material solution containing a raw material resin to be a raw material of fibers and a solvent for dissolving the raw material resin, and a first sheet 2 are prepared.

[Material solution]
The raw material liquid contains a raw material resin and a solvent. The raw material resin is a raw material of fibers, and the solvent dissolves the raw material resin (hereinafter, referred to as a first solvent). From the raw material liquid, a fiber 1F including the raw material resin and the first solvent is formed. The mixing ratio of the raw material resin to the first solvent in the raw material liquid varies depending on the type of raw material resin to be selected and the type of the first solvent. The proportion of the first solvent in the raw material liquid is, for example, 60% by mass to 95% by mass. The raw material liquid may contain solvents other than the first solvent that dissolves the raw material resin, various additives, and the like.

  The type of raw material resin is not particularly limited. For example, polyamide (PA), polyimide (PI), polyamide imide (PAI), polyether imide (PEI), poly acetal (POM), polycarbonate (PC), polyether ether ketone ( PEEK), polysulfone (PSF), polyethersulfone (PES), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyarylate (PAR), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polyvinyl Polymers such as alcohol (PVA), polyvinyl acetate (PVAc), polypropylene (PP), polyethylene terephthalate (PET), polyurethane (PU) and the like can be mentioned. You may use these individually or in combination of 2 or more types. Among them, PES is preferable in that it is suitable for the electrospinning method.

  The first solvent is not particularly limited as long as it can dissolve the raw material resin. For example, methanol, ethanol, 1-propanol, 2-propanol, hexafluoroisopropanol, tetraethylene glycol, triethylene glycol, dibenzyl alcohol, 1,3-dioxolane, 1,4-dioxane, methyl ethyl ketone, methyl isobutyl ketone, methyl- n-Hexyl ketone, methyl-n-propyl ketone, diisopropyl ketone, diisobutyl ketone, acetone, hexafluoroacetone, phenol, formic acid, methyl formate, ethyl formate, propyl formate, methyl benzoate, ethyl benzoate, propyl benzoate, acetic acid Methyl, ethyl acetate, propyl acetate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, methyl chloride, ethyl chloride, methylene chloride, chloroform, o-chlorotoluene, p- Rolotoluene, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, trichloroethane, dichloropropane, dibromoethane, dibromopropane, methyl bromide, ethyl bromide, propyl bromide, acetic acid, benzene, toluene, hexane, cyclohexane , Cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, N-dimethylformamide, N, N-dimethylacetamide (DMAc), dimethyl sulfoxide, pyridine, water, etc. it can. These may be used alone or in combination of two or more. Among them, DMAc is preferable in that it is suitable for the electrospinning method and it is easy to dissolve PES.

[First sheet]
In the laminate 10, the first sheet 2 serves as a base for supporting the nonwoven fabric 1. The form and material of the first sheet 2 are not particularly limited, and may be appropriately selected according to the application. Examples of the first sheet 2 include resin films, sheets made of paper, and fiber structures such as woven fabrics, knitted fabrics and non-woven fabrics. For example, when using the laminated body 10 as various filter materials, it is preferable that the 1st sheet 2 is a nonwoven fabric from a viewpoint of pressure loss.

  The material of the fiber 2F constituting the first sheet 2 is not particularly limited. For example, glass fiber, cellulose, acrylic resin, PP, polyethylene (PE), polyester (for example, PET, polybutylene terephthalate etc.), PA, or these And the like. Among them, in terms of being suitable as a base material, the material of the fiber 2F is preferably PET or cellulose. The fiber diameter D2 of the fiber 2F is not particularly limited, and may be larger than the fiber diameter D1 of the fiber 1F contained in the laminate 10, for example. The fiber diameter D2 is, for example, preferably 0.5 μm or more and 20 μm or less, and more preferably 10 μm or more and 20 μm or less.

  When the laminate 10 is used as a battery separator, the first sheet 2 is preferably a resin sheet from the viewpoint of handleability. As resin which comprises a resin sheet, polyester, such as PP, PE, PET, etc. can be used. Among them, PET is preferable from the viewpoint of dimensional stability, solvent resistance, and cost.

The thickness of the first sheet 2 is also not particularly limited, and may be appropriately set according to the application. The thickness of the first sheet 2 is, for example, 100 μm or more and 500 μm or less. The thickness of the first sheet 2 is more preferably 150 μm or more. The thickness of the first sheet 2 is more preferably 400 μm or less. The mass per unit area of the first sheet 2 is also not particularly limited, and may be appropriately set according to the application. The mass per unit area of the first sheet 2 is, for example, 5 g / m ² or more and 60 g / m ² or less. It said mass, more preferably 10 g / ^{m 2} or more, particularly preferably 40 g / ^{m 2} or more. The mass is more preferably 50 g / m ² or less, particularly preferably 45 g / m ² or less.

  When the first sheet 2 is long, as shown in FIG. 1, the first sheet 2 may be wound around the first supply reel 22. In this case, the first sheet 2 may be supplied to the transport unit 3 while being discharged from the first supply reel 22.

(2) Second Step In the second step, a non-woven fabric containing fibers 1F is formed on one main surface of the first sheet 2 by the electrospinning method. In the second step, the first sheet 2 is a target of the raw material liquid to be jetted, and is a collector for collecting the fibers 1F to be generated.

[Electrospinning method]
In the electrospinning method, the target (first sheet 2) is grounded or negatively charged, and a positively charged raw material liquid is injected from a nozzle (not shown). In the process of reaching the first sheet 2, a part of the first solvent is volatilized, and the fibers 1 F are deposited on the first sheet 2 to form the non-woven fabric 1. The first solvent is contained in, for example, 5 to 10% by mass in the fiber 1F immediately after being formed.

[Non-woven fabric]
The fiber diameter D1 of the fiber 1F is not particularly limited, and may be appropriately set according to the application and the like. Among them, the fiber diameter D1 is preferably less than 1 μm, and more preferably less than 500 nm in that the solvent inside the fiber is more easily removed uniformly and that it is easily formed by electrospinning. . The fiber diameter D1 is preferably 50 nm or more, and more preferably 100 nm or more. In addition, the fiber diameter D1 is an average fiber diameter of the fiber 1F after the 3rd process (drying process) mentioned later. The fiber diameter of the fiber to be spun may be adjusted so that the fiber diameter D1 after drying is, for example, less than 1 μm. When the fiber diameter D1 is in this range, the surface area of the non-woven fabric 1 to be formed is increased, and voids are easily formed between the fibers. Therefore, the laminated body 10 containing such a nonwoven fabric 1 is suitable as a filter material.

  Here, the fiber diameter is the diameter of the fiber. The diameter of a fiber is the diameter of a cross section perpendicular to the longitudinal direction of the fiber. If such a cross section is not circular, the largest diameter may be considered as the diameter. Further, the width in the direction perpendicular to the longitudinal direction of the fibers when the laminate 10 is viewed from the normal direction of one of the main surfaces may be regarded as the diameter of the fibers. The fiber diameter is, for example, the average value of the fiber diameters of 10 arbitrary fibers (hereinafter the same).

  The amount (deposition amount) of depositing the fiber 1F is not particularly limited, and may be appropriately set according to the desired mass per unit area of the non-woven fabric 1 (mass per unit area of the non-woven fabric 1 after drying) and thickness. good. The mass per unit area of the nonwoven fabric 1 after drying is suitably set according to a use etc. The average thickness of the non-woven fabric 1 after drying is not particularly limited, and is, for example, 0.5 μm or more and 10 μm or less, preferably 1 μm or more and 5 μm or less. The average thickness is, for example, an average value of the thickness at any ten places of the non-woven fabric 1 after drying.

When the laminate 10 is used as a filter material for air cleaning, the mass per unit area of the non-woven fabric 1 after drying is 0.1 g / m ² or more, 1 from the viewpoint of the balance between pressure loss and dust collection efficiency. is preferably .5g / ^{m 2} or less, 0.2 g / ^{m 2} or more, more preferably 0.5 g / ^{m 2} or less, 0.2 g / ^{m 2} or more, 0.8 g / ^{m 2} or less Being particularly preferred.

[Transporter]
Prior to the second step, the first sheet 2 is supplied to the transport unit 3. The transport unit 3 includes, for example, transport rolls 21, 31 (31a, 31b) and 41. The first sheet 2 is conveyed by the conveyance rolls to an apparatus in which each process after the second process is performed. Thereby, the production efficiency of the laminated body 10 is improved.

  In the second step, the transport unit 3 may include the transport belt 31c. The conveyance belt 31 c supports the first sheet 2 in a flat shape, and functions as a collector for collecting the fibers 1 </ b> F like the first sheet 2. The transport belt 31c is, for example, an endless belt in which both longitudinal end portions are coupled, and rotates along with the rotational driving of the pair of transport rolls 31 (31a and 31b).

  The material of the transport belt 31c is not particularly limited, and may be appropriately selected according to processing conditions and the like. Examples of the material of the transport belt 31 c include a fiber structure, rubber, resin, steel and the like. These may be used alone or, for example, may be used in combination of two or more types like a cloth layer conveyor belt in which a fiber structure is sandwiched by rubber. The width perpendicular to the conveyance direction of the conveyance belt 31 c is not particularly limited, and may be appropriately set to be larger than the width Wf perpendicular to the conveyance direction of the first sheet 2. The thickness of the conveyance belt 31c is not particularly limited, and may be set appropriately according to the material of the conveyance belt 31c, the size of the tension to be applied, and the like.

(3) Third Step In the third step, the precursor of the laminate 10 of the non-woven fabric 1 and the first sheet 2 formed in the second step is heated by the heating device 4 for irradiating an electromagnetic wave and remains on the non-woven fabric 1 And removing at least a portion of the first solvent. Thereby, the fibers 1F deposited on the first sheet 2 and in close contact with each other are point-bonded. Here, the precursor is provided to the third step while being supported by the transport roll 41 and transported.

[reflector]
Ideally, the object to be heated is uniformly heated by the heating device, but due to the characteristics of the heating device, heating unevenness usually occurs. In particular, the portion of the object to be heated opposite to the center of the heating device is easily heated, and becomes more difficult to heat as the distance from the center of the heating device to the object to be heated increases. This tendency is the same regardless of whether the form of heat conduction is convective heat transfer or radiative heat transfer. Therefore, in many cases, the drying of the object to be heated does not proceed uniformly.

Therefore, as shown in FIGS. 1 and 2, the electromagnetic wave emitted from the heating device 4 is directed to the end Tf (Tf ₁ , Tf ₂ ) of the non-woven fabric 1 on the opposite side of the non-woven fabric 1 from the heating device 4. The reflecting plate 5 (5a, 5b) which reflects the said electromagnetic waves (a far-infrared ray 42 mentioned later is included) is arrange | positioned in the position reflected. Thereby, the electromagnetic wave directly enters from the heating device 4 to the end Tf, and the electromagnetic wave reflected by the reflection plate 5 enters. Therefore, the heating of the end Tf which is difficult to be heated is promoted, and the heating unevenness is eliminated, whereby the drying of the non-woven fabric proceeds uniformly. By disposing the reflection plate 5, when the highest temperature of the surface of the central portion Cf of the non-woven fabric 1 is 100, the lowest temperature of the surface of the end Tf may be, for example, 90 or more.

  In addition, in the example of illustration, although the reflecting plate 5 is arrange | positioned under the heating apparatus 4 and the nonwoven fabric 1, it is not limited to this. For example, the reflector 5 may be disposed above the heater 4 and the non-woven fabric 1 by reversing the arrangement of the heater 4 and the reflector 5.

  The fibers 1F immediately after being formed by the electrospinning method are deposited only in contact with each other. Therefore, the nonwoven fabric 1 is usually dried while being supported from below by the first sheet 2. That is, in the drying step, the precursor is generally disposed so that the nonwoven fabric 1 is on the top surface. Therefore, from the viewpoint of drying efficiency, the heating device 4 is preferably disposed on the non-woven fabric 1 side (that is, above the non-woven fabric 1), and the reflecting plate 5 is disposed on the first sheet 2 side (below the non-woven fabric 1). Preferably. Hereinafter, the case where the reflecting plate 5 is arrange | positioned under the heating apparatus 4 and the nonwoven fabric 1 is mentioned as an example, and is demonstrated.

The end Tf is a region including the end face of the nonwoven fabric 1. In the present embodiment, the nonwoven fabric 1 is subjected to the third step while being transported. In this case, as shown in FIG. 3, the end faces of the non-woven fabric 1 are both ends (1C ₁ and 1C ₂ ) in the cross section of the non-woven fabric 1 viewed from the conveying direction D. The end Tf ₁ (Tf ₂ ) is a region from the end face 1C ₁ (1C ₂ ) to a distance of 25% or less of the width Wf of the nonwoven fabric 1. In other words, the end Tf ₁ (Tf ₂ ) is a band-like region that includes the end face 1C ₁ (1C ₂ ) of the non-woven fabric 1 and is formed along the transport direction D and occupies 25% or less of the area of the non-woven fabric 1 is there. When the non-woven fabric 1 is not long but rectangular and cut into a predetermined size, the end face 1C of the non-woven fabric 1 is the outer edge (four sides), and the end Tf corresponds to the four sides. It can be defined.

The size of the end Tf ₁ (Tf ₂ ) is not particularly limited as long as it is 25% or less of the area of the nonwoven fabric 1, and may be set appropriately in consideration of the characteristics of the heating device 4. From the viewpoint of drying efficiency, the size of the end Tf ₁ (Tf ₂ ) is preferably 15% or more of the area of the nonwoven fabric 1. The sum of the areas of the ends Tf ₁ and Tf ₂ is, for example, 50% or less and 30% or more of the area of the nonwoven fabric 1. The areas of the ends Tf ₁ and Tf ₂ may be the same or different. In consideration of the characteristics of the heating device 4, for example, the area of the end Tf ₂ may be zero. In this case, the reflecting plate 5 reflects the electromagnetic wave only toward the end Tf ₁ . Central Cf, as shown in FIG. 3, an area other than the end portion Tf ₁ and Tf ₂ of the nonwoven fabric 1.

The reflecting plate 5 may be disposed at a position and an angle at which the electromagnetic wave emitted from the heating device 4 is reflected toward the end Tf on the opposite side of the non-woven fabric 1 from the heating device 4. If for reflecting electromagnetic waves to both ends Tf ₁ and the end portion Tf _2, as shown in FIG. 2, the reflecting plate 5 two or more, it may be disposed.

  At the point where it is easy to reflect an electromagnetic wave to the end Tf, the reflecting plate 5 is such that the electromagnetic wave emitted from the heating device 4 is incident on the main surface of the reflecting plate 5 substantially perpendicularly (for example, 70 ° or more and 110 ° or less) Preferably, they are arranged at positions which are reflected substantially perpendicularly. In this case, from the viewpoint of reflection efficiency, it is preferable that the reflection plate 5 be disposed between the reflection plate 5 and the heating device 4 so that the end Tf of the non-woven fabric 1 is located as shown in FIG. . In other words, it is preferable that the heating device 4 be present vertically above any point in the end Tf, and that the reflecting plate 5 (5a or 5b) be present vertically below any point in the end Tf. preferable. At this time, it is preferable that the reflecting plate 5 (5a and 5b) is not disposed vertically below an arbitrary point in the central portion Cf from the viewpoint of uniformity of drying.

  In the above case, the reflecting plate 5 is more preferably disposed vertically below an arbitrary point on the end portion Th of the heating device 4. At this time, it is preferable that the reflecting plate 5 (5a and 5b) is not disposed vertically below an arbitrary point in the central portion Ch of the heating device 4 from the viewpoint of uniformity of drying.

The end portion Th of the heating device 4 can be defined as a region including both end surfaces (4C ₁ or 4C ₂ ) in the cross section of the heating device 4 viewed from the conveying direction D of the non-woven fabric 1 similarly to the end Tf of the non-woven fabric 1 See Figure 4). The end portion Th ₁ (Th ₂ ) is a region from the end face 4C ₁ (4C ₂ ) to a distance of 25% or less of the width Wh of the heating device 4. In other words, the end portion Th ₁ (Th ₂ ) includes the end face 4C ₁ (4C ₂ ) of the heating device 4 and is formed along the transport direction D, and has a strip shape that occupies 25% or less of the area of the heating device 4 It is an area. If the non-woven fabric 1 is not long but rectangular cut into a predetermined size, the end Th of the heating device 4 may be defined as an area including its outer edge and formed along the outer edge. The central portion Ch of the heating device 4 is a region other than the end portion Th of the heating device 4.

From the viewpoint of uniformity of drying, the shortest distance Lh from the main surface 1A facing the heating device 4 of the nonwoven fabric 1 to the heating device 4 and the shortest distance from the main surface 1B facing the reflecting plate 5 of the nonwoven fabric 1 to the reflecting plate 5 The distance Lr preferably satisfies the relationship of Lh <Lr. As a result, excessive heating of the end portion Tf ₁ (Tf ₂ ) and a rapid temperature rise are suppressed, and the uniformity of drying is further improved. It is more preferable that the shortest distances Lh and Lr satisfy the relationship of Lh <0.7 × Lr. The shortest distance Lh is not particularly limited, and may be, for example, 5 mm or more and 50 mm or less. The shortest distance Lr is not particularly limited, and may be, for example, 10 mm or more and 100 mm or less.

  The material of the reflecting plate 5 (5a, 5b) is not particularly limited as long as it can reflect the electromagnetic wave emitted from the heating device 4. As a material of the reflecting plate 5 (5a, 5b), aluminum, gold, silver, copper etc. can be illustrated, for example. Among them, aluminum and gold are preferable in view of oxidation resistance, and aluminum is particularly preferable in view of cost. It is preferable that the surface of the reflecting plate 5 is mirror finished in that the reflectance is increased.

  The reflectance to the electromagnetic waves of the reflection plate 5 (5a, 5b) is not particularly limited, and may be set appropriately in consideration of the characteristics of the heating device 4. Among them, in view of heating efficiency, the reflectance is preferably 90% or more and 100% or less, and more preferably 95% or more and 100% or less. The reflectance is measured by, for example, Fourier transform infrared spectrophotometer (FTIR) (hereinafter the same).

The shape of the reflecting plate 5 (5a, 5b) is also not particularly limited. For example, the reflecting plate 5 (5a, 5b) may be a rectangle having a width equal to or greater than the width of the end Tf ₁ (Tf ₂ ) as viewed in the conveyance direction D. The length seen from the direction perpendicular to the transport direction D of the reflecting plate 5 is not particularly limited, and may be set appropriately in consideration of the size of the heating device 4. The length of the reflecting plate 5 may be shorter than, for example, a length viewed from a direction perpendicular to the conveyance direction D of the heating device 4. The thickness of the reflecting plate 5 is not particularly limited, and may be, for example, 0.05 mm or more and 2 mm or less.

[Shield]
Furthermore, as shown in FIG. 5, a shielding plate 6 may be disposed between the central portion Cf of the non-woven fabric 1 and the heating device 4 for shielding a part of the electromagnetic wave emitted from the heating device 4. The shielding plate 6 is suspended, for example, from a part of the heating device 4 by the suspending member 9. FIG. 5 is a cross-sectional view schematically showing the shielding plate 6 as viewed in the transport direction D. As shown in FIG. At this time, it is preferable that the shielding plate 6 be disposed between the central portion Cf of the non-woven fabric 1 and the central portion Ch of the heating device 4. In particular, the central portion Ch of the heating device 4 is preferably present vertically above any point in the shielding plate 6. Moreover, it is preferable that the center part Cf of the nonwoven fabric 1 exists in the perpendicular downward direction of the arbitrary points in the shielding board 6. While a heating efficiency improves, it is for a heating nonuniformity to be suppressed further.

  The shielding plate 6 reflects or absorbs a part of the electromagnetic wave emitted from the heating device 4 and makes the remaining part incident on the non-woven fabric 1. Thereby, heating of central part Cf of a nonwoven fabric is controlled, and the evenness of dryness improves further. By disposing the shielding plate 6 together with the reflecting plate 5, when the highest temperature of the surface of the central portion Cf of the nonwoven fabric 1 is 100, the lowest temperature of the surface of the end Tf may be, for example, 93 or more.

  The size of the shielding plate 6 may be appropriately set according to the arrangement of the shielding plate 6 and the heating characteristics of the heating device 4. For example, the length of the shielding plate 6 as viewed in the conveyance direction D may be the same as the width of the central portion Cf of the nonwoven fabric 1 as viewed in the conveyance direction D, or may be shorter than the width of the central portion Cf. good. The length of the shielding plate 6 as viewed in the direction perpendicular to the transport direction D is not particularly limited. For example, the length of the shielding plate 6 as viewed in the direction perpendicular to the transport direction D may be shorter than the length as viewed in the direction perpendicular to the transport direction D of the heating device 4. The shape of the shielding plate 6 is also not particularly limited, and may be circular, rectangular or the like.

The shield plate 6 may be appropriately moved between the central portion Cf and the heating device 4 in accordance with the characteristics of the heating device 4. In Figure 5, although suspended closure plate 6 by hanging members 9 from the center C ₄ of the heating device, by changing the position of the hanging members 9, for example, the shielding plate from the end of the central portion Ch of the heating device 4 6 You may suspend the Further, the shield plate 6 may be disposed in a removable state, and may be replaced with a shield plate having a different size or a shield ratio to be described later according to the heating device 4 used.

  From the viewpoint of uniformity of drying, the shortest distance Lh from the main surface 1A facing the heating device 4 of the nonwoven fabric 1 to the heating device 4 and the shortest distance Ls from the main surface 1A to the shielding plate 6 are 1/3 × It is preferable to satisfy the relationship of Lh ≦ Ls ≦ 2/3 × Lh. This further improves the uniformity of drying. The shortest distance Ls is not particularly limited, and may be, for example, 2.5 mm or more and 25 mm or less.

  The shielding plate 6 preferably shields (reflects or absorbs) an electromagnetic wave of 90% or more and 100% or less in terms of heating efficiency. The shielding rate is measured, for example, by Fourier transform infrared spectrophotometer (FTIR).

  The material of the shielding plate 6 includes one that reflects or absorbs a part of the electromagnetic wave. As a material of such a shielding plate 6, aluminum, gold, silver, copper etc. can be illustrated, for example. Among them, aluminum and gold are preferable in view of oxidation resistance, and aluminum is particularly preferable in view of cost. The thickness of the shielding plate 6 is also not particularly limited. Among them, the thickness of the shielding plate 6 is preferably 0.05 mm or more and 2 mm or less from the viewpoint of the shielding effect of electromagnetic waves.

[Heating device]
The heating device 4 transfers thermal energy to the solvent by convective heat transfer and / or radiative heat transfer. The solvent is thereby heated and vaporized. Above all, the heating device 4 preferably has a function of emitting far infrared rays 42.

  Far infrared radiation is an electromagnetic wave having a wavelength of about 3 μm to 1 mm. Most of the compounds containing carbon (organic matter) absorb or transmit most of far-infrared rays (eg, 95% or more). Therefore, by using the heating device 4 having a function of emitting far infrared rays 42, thermal energy is transferred to the solvent by radiative heat transfer in addition to convective heat transfer. That is, the thermal energy is not only on the surface of the fiber 1F on the main surface on the heating device 4 side, but also on the fiber 1F existing on the first sheet 2 side, the fiber 1F existing inside the non-woven fabric 1, and further, the fiber 1F It is easy to be transmitted to the inside of the Thus, at least a portion of the solvent contained in the entire nonwoven fabric 1 can be uniformly removed from the entire nonwoven fabric 1. That is, by using the heating device 4 that emits the far infrared rays 42, the fibers 1F are uniformly dried, and the whole nonwoven fabric 1 is also dried uniformly. As a result, the time required for drying the non-woven fabric 1 is shortened, and the drying efficiency is improved. When the non-woven fabric 1 is dried while being transported, the heating device can be miniaturized as the drying time is shorter. Therefore, space saving can be achieved.

  The far infrared rays 42 are emitted, for example, by heating the ceramic. The heating device 4 includes, for example, one or more rod-like heaters (sheathed heaters) in which a heating element such as a nichrome (an alloy containing nickel and chromium) wire is coated with a ceramic. In addition, the heating device 4 may include a panel-like heater (all not shown) in which a plate-like heating element is coated with a ceramic. The temperature of the heater may be appropriately set according to the type of ceramics to be used, the melting temperature of the adhesive, and the like. The temperature of the heater is, for example, preferably about 100 ° C. or more and about 300 ° C. or less, and more preferably about 100 ° C. or more and about 150 ° C. or less.

  The ceramic used for the heating device 4 is not particularly limited as long as it can emit far infrared radiation. Since the wavelength of the far infrared radiation to be emitted is different depending on the type of the ceramic, it is sufficient to appropriately select the ceramic that emits the far infrared radiation having the desired wavelength. Examples of the ceramic include aluminum oxide, silicon nitride, aluminum nitride, zircon and the like.

  The wavelength contained in the far infrared rays 42 emitted by the heating device 4 may be appropriately set according to the type of the first solvent, the raw material resin, and the like, and is not particularly limited. For example, from the viewpoint of drying efficiency, the far infrared ray 42 preferably includes the first wavelength whose transmittance to the raw material resin is 50% or more. As a result, the far infrared rays 42 reach not only the surface of the fiber 1F on the heating device 4 side but also the inside of the fiber 1F and the surface of the fiber 1F on the opposite side to the heating device 4 To be absorbed by the solvent. Thus, at least a portion of the solvent contained in the fiber 1F can be uniformly removed from the entire fiber 1F. The transmittance of the raw material resin of the first wavelength is preferably 75% or more. The transmittance is measured, for example, by Fourier transform infrared spectrophotometer (FTIR).

  At this time, the absorptivity by the first solvent of the first wavelength is not particularly limited. The absorptivity of the first solvent at the first wavelength may be, for example, less than 1%. Even in this case, when the first wavelength is absorbed by the raw resin, the first solvent present around the raw resin can be heated and dried. From the viewpoint of drying efficiency, the absorptivity of the first solvent by the first wavelength is preferably 0.1% or more. The absorptivity is measured, for example, by Fourier transform infrared spectrophotometer (FTIR).

  From the viewpoint of further improving the drying efficiency and the uniformity of drying, the first wavelength preferably has a transmittance to water of 75% or more. The fiber 1F and the first solvent may contain water. When the transmittance to water of the first wavelength is 75% or more, the first wavelength can act on the first solvent without being absorbed by the water that may be present together with the fiber 1F and the first solvent. Thus, the drying efficiency and the uniformity of drying are further improved. The transmittance to water of each wavelength is shown in FIG. 9 for reference.

  If the first wavelength has a permeability of 75% or more to water, the permeability to water vapor is also high. In the second step, electrospinning may be performed under a high humidity atmosphere in order to increase the average fiber diameter D1 of the fibers 1F. In this case, since the second and third steps are continuous, the heating device 4 is also placed under a high humidity atmosphere. Even in such a case, when the transmittance to water of the first wavelength is 75% or more, the first wavelength is hardly absorbed by the water vapor in the atmosphere, and may act on the first solvent. That is, the first solvent can be removed efficiently without being affected by the humidity conditions.

  In consideration of the above respective aspects, the first wavelength is preferably 2.5 μm or more and 5.5 μm or less, and more preferably 4 μm or more and 5.5 μm or less. Further, from the viewpoint of drying efficiency, it is preferable that the first wavelength is included in the range of wavelength (peak wavelength) ± 1 μm at which the amount of energy emitted from the heating device 4 is maximum.

  The size of the heating device 4 is not particularly limited, and may be appropriately set in consideration of the width of the non-woven fabric 1 viewed from the conveying direction D, the installation space of the heating device 4 and the like. The width of the heating device 4 as viewed in the conveyance direction D may be longer than the width of the nonwoven fabric 1 as viewed in the conveyance direction D, for example.

(4) Fourth and Fifth Steps As shown in FIG. 6, after the second step and before the third step, the fourth step of applying the adhesive 7 to the nonwoven fabric 1 and the adhesive 7 are applied. A fifth step of laminating the second sheet 8 on the nonwoven fabric 1 may be included. Thereby, the joined body 11 of the laminated body 10 and the second sheet 8 is obtained. In this case, in the third step, along with the drying of the non-woven fabric 1, melting of the adhesive 7 is performed as needed.

[adhesive]
The adhesive 7 is applied to the non-woven fabric 1 in order to bond the second sheet 8 and the non-woven fabric 1. The method for applying the adhesive 7 is not particularly limited, and a coating method, a spray method, free fall, and the like can be exemplified. Among them, it is preferable to apply the melted adhesive 7 or the powdery adhesive 7 to the non-woven fabric 1 by a spray method in that damage to the non-woven fabric 1 is suppressed.

Although the application amount of the adhesive 7 is not particularly limited, it is, for example, 0.5 g / m ² or more and 5 g / m ² or less. The type of the adhesive 7 is not particularly limited. For example, a powder such as a hot melt adhesive mainly composed of PU, polyester such as PET, PA, polyolefin (PP, PE, etc.) or the like, or thermosetting resin Adhesive etc. are mentioned.

  When the fourth step is performed before the third step, and the heating device 4 radiates the far infrared ray 42, the far infrared ray 42 has a second wavelength at which the transmittance to the adhesive 7 is 50% or more and 95% or less Is preferred. As a result, the far infrared rays 42 are absorbed to a certain extent by the adhesive 7 and permeate the adhesive 7, and further, the first solvent contained in the fiber 1 F below the adhesive 7 as viewed from the heating device 4 side Can also be absorbed. That is, the melting of the adhesive 7 and the drying of the fibers 1F can be performed efficiently and uniformly in the same process.

  From the same viewpoint as the first wavelength, the second wavelength preferably has a transmittance of 75% or more to water. Such a second wavelength is, for example, preferably 2.5 μm or more and 5.5 μm or less, and more preferably 4 μm or more and 5.5 μm or less. Further, from the viewpoint of drying efficiency, it is preferable that the second wavelength is included in the range of the wavelength (peak wavelength) ± 1 μm at which the amount of energy radiated from the heating device 4 is maximum.

[Second sheet]
The second sheet 8 is a protective material of the nonwoven fabric 1 and protects the nonwoven fabric 1 from various external loads. The second sheet 8 may be, for example, a non-woven fabric manufactured by a spun bond method, a dry method (for example, an air laid method), a wet method, a melt blow method, a needle punch method or the like. Among them, in the case where the laminate 10 is used as various filter materials, the second sheet 8 is preferably a non-woven fabric manufactured by a melt-blowing method in that a non-woven fabric having a thin fiber diameter is easily formed.

  The material of the fiber 3F constituting the second sheet 8 is not particularly limited, and examples thereof include glass fiber, cellulose, acrylic resin, PP, PE, polyester such as PET, PA, or a mixture thereof. The fiber diameter D3 of the fibers 3F is not particularly limited. The fiber diameter D3 is, for example, 0.5 μm or more and 20 μm or less, and preferably 5 μm or more and 20 μm or less.

  Similar to the first sheet 2, when the second sheet 8 is long, it may be wound around the second supply reel 62. In this case, the second sheet 8 is stacked on the nonwoven fabric 1 while being discharged from the second supply reel 62.

Second Embodiment
Next, one embodiment of another manufacturing method according to the present invention will be described with reference to FIG. In the present embodiment, the transport unit 3 further includes a pair of transport rolls (41a, 41b) and a transport belt 41c, and the nonwoven fabric 1 is transported below the heating device 4 by the transport belt 41c. The conveying belt 41c is, for example, an endless belt in which both end portions in the longitudinal direction are coupled, and rotates along with the rotational driving of the pair of conveying rolls 41a and 41b. The present embodiment is the same as the first embodiment except for the above. The material of the conveyance belt 41c is not particularly limited, and the same material as exemplified for the conveyance belt 31c can be exemplified.

  The reflecting plate 5 may be disposed between the non-woven fabric 1 and the transport belt 41 c by being fixed to the surface of the transport belt 41 c facing the non-woven fabric 1. In this case, it is preferable that the reflectance to the electromagnetic wave emitted from the heating device 4 of the transport belt 41 c is lower than the reflectance of the reflection plate 5 from the viewpoint of the uniformity of drying. The thickness of the reflective plate 5 (5a, 5b) is preferably 0.05 mm or more and 2 mm or less. This is because the influence of the reflecting plate 5 on the temperature distribution is suppressed. In addition, it is preferable that the reflecting plate 5 be disposed at a position not in contact with the non-woven fabric 1 from the viewpoint of suppressing excessive heating of the end Tf and a rapid temperature rise.

[manufacturing device]
Hereinafter, an embodiment of a manufacturing apparatus 100 according to the present invention will be described with reference to FIG. FIG. 8 is a view showing a configuration example of a manufacturing apparatus according to an embodiment of the present invention. The manufacturing apparatus 100 shown in FIG. 8 includes an adhesive applying unit 50 and a second sheet laminating unit 60, and corresponds to the manufacturing method according to the first embodiment.

[First sheet supply unit]
The first sheet supply unit 20 is disposed on the uppermost stream of the manufacturing apparatus 100, and supplies, for example, the long first sheet 2 wound into a roll to the conveyance belt 31c via the conveyance roll 21. . In this case, the first sheet 2 is wound around the first supply reel 22, and the first supply reel 22 is rotated by the drive of the motor 23. The conveyance belt 31c is endless and rotates with the rotation of the pair of conveyance rolls 31a and 31b. The first sheet 2 is conveyed from the first sheet supply unit 20 toward the collection unit 70 by the conveyance unit 3 (the conveyance roll and the conveyance belt).

[Non-woven fabric formation part]
The non-woven fabric forming unit 30 includes an electrospinning mechanism as a fiber spinning mechanism. The electrospinning mechanism includes a discharger 33 for discharging the raw material liquid 32 disposed above in the non-woven fabric forming unit 30, a charging means (see below) for positively charging the discharged raw material liquid 32, and a discharger And a conveyance belt 31 c configured to convey the first sheet 2 disposed to face the sheet 33 from the upstream side to the downstream side. The transport belt 31 c functions as a collector unit that collects the fibers 1 F together with the first sheet 2.

  On the side opposite to the main surface of the first sheet 2 of the discharge body 33, a plurality of discharge ports (not shown) of the raw material liquid 32 are provided. The distance between the discharge port and the first sheet 2 is, for example, 100 mm or more and 600 mm or less, although it depends on the size of the manufacturing apparatus. The discharge body 33 is disposed above the non-woven fabric forming portion 30, and the second support 35 extending downward from the first support 34 parallel to the conveyance direction of the first sheet 2 has its own longitudinal direction as the first sheet It is supported so as to be parallel to the main surface of 2.

  The charging means is composed of a voltage application device 36 for applying a voltage to the emitter 33, and a counter electrode 37 installed parallel to the transport belt 31c. The counter electrode 37 is grounded. Thereby, a potential difference (for example, 20 kV or more and 200 kV or less) corresponding to the voltage applied by the voltage application device 36 can be provided between the emitter 33 and the counter electrode 37. The configuration of the charging unit is not particularly limited. For example, the counter electrode 37 may be negatively charged. Further, instead of providing the counter electrode 37, the transport belt 31c may be made of a conductor.

  The emitter 33 is made of a conductor, has an elongated shape, and its inside is hollow. The hollow portion is a storage portion for storing the raw material liquid 32. The raw material liquid 32 is supplied from the raw material liquid tank 39 to the hollow of the discharge body 33 by the pressure of the pump 38 communicating with the hollow portion of the discharge body 33. The raw material liquid 32 is discharged from the discharge port toward the main surface of the first sheet 2 by the pressure of the pump 38. The discharged raw material liquid 32 electrostatically explodes while moving in the space between the emitter 33 and the transport belt 31c in a charged state to generate a fibrous material (fiber 1F). Thereby, a precursor in which the non-woven fabric 1 before drying and the first sheet 2 are laminated is obtained.

[Adhesive application unit]
Subsequently, the precursor 10 a is conveyed to the adhesive application unit 50 while being supported by the conveyance roll 51. The adhesive application unit 50 includes, for example, a spraying device 54 including an adhesive tank 52 containing the adhesive 7 installed above the adhesive applying unit 50, and a spray 53 for spraying the adhesive 7 Do. For example, a powdery adhesive is sprayed from the spray 53 and mainly adheres to the surface of the nonwoven fabric 1 of the precursor 10a.

[Drying section]
Subsequently, the precursor 10 a is transported to the drying unit 40 while being supported by the transport roll 41. In the drying unit 40, at least a part of the first solvent contained in the fiber 1F is removed by the heating device 4. Furthermore, in the drying unit 40, the adhesive 7 on the non-woven fabric 1 is melted as needed. The shortest distance Lh from the main surface 1A of the non-woven fabric 1 facing the heating device 4 to the heating device 4 may be appropriately set according to the capacity of the heating device 4 and the like, but is, for example, 5 mm or more and 50 mm or less.

  The reflector 5 is disposed on the opposite side of the non-woven fabric 1 to the heating device 4 and at a position where the electromagnetic wave emitted from the heating device 4 is reflected toward the end Tf. At this time, it is preferable to control the heating device 4 while disposing the reflection plate 5 so that the surface of the end Tf of the non-woven fabric 1 becomes, for example, a temperature equal to or higher than the boiling point of the first solvent. The surface temperature of the end Tf of the nonwoven fabric 1 being heated is, for example, 100 ° C. or more and 200 ° C. or less. When the adhesive 7 is applied to the non-woven fabric 1, the surface temperature of the end 1T of the non-woven fabric 1 is reflected so that the surface temperature is higher than the melting temperature of the adhesive 7 and higher than the boiling point of the first solvent. It is preferable to arrange the plate 5 and to control the heating device 4.

[Second sheet stacking unit]
The dried laminate 10 is subsequently conveyed to the second sheet laminating unit 60. In the second sheet laminating unit 60, the second sheet 8 is supplied from above the laminated body 10 via the transport roll 61, and is laminated on the laminated body 10 via the adhesive 7. Subsequently, the laminate 10 and the second sheet 8 are joined while applying pressure by the pair of pressure rolls 63 (63a and 63b) arranged to sandwich the laminate 10. Although the pressure by a pressure roll is not specifically limited, For example, they are 1 kPa or more and 50 kPa or less. The second sheet 8 is wound around the second supply reel 62, and is supplied to the laminate 10 in accordance with the transport speed of the laminate 10.

  The joined body 11 of the laminate 10 and the second sheet 8 carried out of the second sheet laminating unit 60 may be collected by the collection unit 70 disposed further downstream via the transport roll 71. . The recovery unit 70 incorporates a recovery reel 72 for scooping the conveyed joined body 11. The recovery reel 72 is rotationally driven by the motor 73.

  The laminate obtained by the production method and the production apparatus of the present invention comprises a non-woven fabric formed by the electrospinning method and uniformly dried. Therefore, the laminate is preferably used in other applications such as a filter material of an air purifier, a separation sheet for a battery, an extracorporeal test sheet such as a pregnancy test sheet, and a wiping sheet for wiping off dust.

1: Non-woven fabric, 2: First sheet, 3: Conveying unit, 4: Heating device, 5: Reflector, 6: Shield, 7: Adhesive, 8: Second sheet, 9: Hanging member, 10: Laminate , 11: conjugate, 20: first sheet supply unit, 21: conveyance roll, 22: first supply reel, 23: motor, 30: non-woven fabric formation section, 31a, 31b: conveyance roll, 31c: conveyance belt, 32: Raw material liquid, 33: Ejector, 34: First support, 35: Second support, 36: Voltage application device, 37: Counter electrode, 38: Pump, 39: Raw material liquid tank, 40: Drying part, 41, 41a, 41b: transport roll, 41c: transport belt, 42: far infrared, 50: adhesive application section, 51: transport roll, 52: adhesive tank, 53: spray, 54: spreading device, 60: second sheet lamination Part 61: Transport roll 62: Second supply reel 6 : Pressing roll, 70: recovery section, 71: transport roll, 72: recovery reel, 73: motor

Claims (17)

A raw material liquid containing a raw material resin as a raw material of fibers and a solvent for dissolving the raw material resin; and a first step of preparing a first sheet,
A second step of producing a fiber containing the raw material resin and the solvent from the raw material liquid by an electrospinning method, depositing the fiber on one main surface of the first sheet to form a non-woven fabric;
A third step of removing at least a part of the solvent contained in the fiber by a heating device that emits an electromagnetic wave;
The non-woven fabric includes an end Tf including the end face and a central portion Cf other than the end,
The manufacturing method of the laminated body in which the reflecting plate which reflects the said electromagnetic waves is arrange | positioned so that the said electromagnetic waves may be reflected toward the said edge part Tf from the opposite side to the said heating apparatus of the said nonwoven fabric.   The manufacturing method of the laminated body of Claim 1 in which the said edge part Tf is arrange | positioned between the said reflecting plate and the said heating apparatus.   The method for manufacturing a non-woven fabric according to claim 1 or 2, wherein the reflection plate is disposed vertically below the end portion Th of the heating device.   The relationship between the shortest distance Lh from the main surface of the non-woven fabric facing the heating device to the heating device and the shortest distance Lr from the main surface of the non-woven fabric facing the reflecting plate to the reflecting plate is Lh <Lr The manufacturing method of the laminated body as described in any one of Claims 1-3 which satisfy | fills. Before the second step, the first sheet is supplied to a conveyance unit.
The manufacturing method of the laminated body as described in any one of Claims 1-4 which forms the said nonwoven fabric in the said main surface of the said 1st sheet | seat currently conveyed by the said conveyance part in the said 2nd process.   Furthermore, the manufacturing method of the laminated body as described in any one of Claims 1-5 with which the shielding board which shields a part of said electromagnetic waves is arrange | positioned between the said center part Cf and the said heating apparatus.   The method for manufacturing a non-woven fabric according to claim 6, wherein the shielding plate is disposed between the central portion Cf and a central portion Ch of the heating device.   The method for manufacturing a laminate according to any one of claims 1 to 7, wherein the heating device emits far infrared radiation.   The manufacturing method of the laminated body of Claim 8 in which the said far infrared radiation contains the 1st wavelength whose transmittance | permeability with respect to the said raw material resin is 50% or more.   The manufacturing method of the laminated body of Claim 9 whose transmittance | permeability with respect to the water of said 1st wavelength is 75% or more.   The manufacturing method of the laminated body of Claim 9 or 10 whose said 1st wavelength is 2.5 micrometers or more and 5.5 micrometers or less. After the second step, before the third step, including a fourth step of applying an adhesive to the non-woven fabric,
The manufacturing method of the laminated body as described in any one of Claims 1-11 including the 5th process which laminates | stacks a 2nd sheet | seat on the said nonwoven fabric to which the said adhesive agent was provided after the said 3rd process. The heating device emits far infrared radiation,
The manufacturing method of the laminated body of Claim 12 in which the said far-infrared radiation contains the 2nd wavelength whose transmittance | permeability with respect to the said adhesive agent is 50% or more and 95% or less.   The manufacturing method of the nonwoven fabric according to claim 13 whose transmittance to water of said 2nd wavelength is 75% or more.   The manufacturing method of the laminated body of Claim 13 or 14 whose said 2nd wavelength is 2.5 micrometers or more and 5.5 micrometers or less.   The manufacturing method of the laminated body as described in any one of Claims 1-15 whose fiber diameter of the said fiber after the said 3rd process is 1 micrometer or less. The raw resin containing the raw material resin and the solvent is produced from the raw material liquid containing the raw material resin to be the raw material of the fiber and the solvent for dissolving the raw resin by the electrospinning method, and the fiber is used as one of the main sheets of the first sheet. A non-woven fabric forming portion deposited on a surface to form a non-woven fabric;
A drying unit for removing at least a part of the solvent contained in the fiber by a heating device that emits an electromagnetic wave;
The non-woven fabric includes an end Tf including the end face and a central portion Cf other than the end,
The manufacturing apparatus of the laminated body provided with the reflecting plate which reflects the said electromagnetic waves toward the said edge part Tf from the opposite side to the said heating apparatus of the said nonwoven fabric.

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