Manufacturing method of functional composite sheet

Abstract

To provide a manufacturing method of a functional composite sheet, capable of fixing a functional liquid to be sprayed to a sheet so as to improve a yield, and controlling a fixation position of the functional liquid in a conveyance step of the sheet.SOLUTION: A manufacturing method of a functional composite sheet for manufacturing a functional composite sheet 1 which holds a functional liquid 31 between adhered two layer sheets 110, 120 includes the steps of: an adhesive application step of applying an adhesive 21 to the one surface of the first sheet 110; a liquid spray step of spraying the functional liquid 31 to the first sheet 110; and an adhesion step of joining the first sheet 110 and the second sheet 120. In the liquid spray step, the functional liquid 31 is sprayed to the one surface side of the first sheet 110 while sucking air 33 from the other surface side of the first sheet 110.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for producing a functional composite sheet. [Background technology]

[0002] Conventionally, functional liquid coating methods for sheet processing include direct coating, roll transfer, spray, etc. These various coating methods are sometimes used in the manufacture of heating devices and the like, which are manufactured by changing the type of flavoring used for each product in order to improve the user's experience.

[0003] Among the various methods described above, the spray method has the advantage that contamination of the device is suppressed compared to other methods because the coating device does not directly contact the sheet. In addition, the functional liquid can be applied to a wide area of ​​the sheet, and the functional liquid can be permeated in the thickness direction of the sheet. Therefore, a method of spraying the functional liquid onto the sheet with a spray device has been proposed (for example, see Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-78951 A [Patent Document 2] JP 2016-120072 A [Patent Document 3] JP 2021-100658 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the functional liquid is sprayed onto the sheet, the functional liquid is atomized and sprayed, so the functional liquid may not adhere 100% to the sheet and may scatter around the spray position. Therefore, there is room for improvement in terms of yield and control of coating when there is a narrow coating range, such as intermittent coating and coating width.

[0006] The present invention relates to a method for producing a functional composite sheet, which is capable of fixing a sprayed functional liquid on a sheet so as to improve yield during a sheet transport process, and is capable of controlling the fixing position of the functional liquid. [Means for solving the problem]

[0007] The present invention relates to a method for producing a functional composite sheet. The present manufacturing method preferably includes an adhesive application step of applying the adhesive to one side of a long first sheet while conveying the first sheet. The present manufacturing method preferably includes a liquid spraying step of spraying the functional liquid toward the one surface on which the adhesive has been applied in the adhesive application step, thereby causing the first sheet to retain the functional liquid. The present manufacturing method preferably includes an adhesion step of bonding a first sheet holding the functional liquid and a second sheet with the adhesive applied to the first sheet. In the adhesive application step, it is preferable that the adhesive is applied so as to produce a coated area where the adhesive is applied and a non-coated area where the adhesive is not applied. In the liquid spraying step, it is preferable that the functional liquid is sprayed toward the one surface side of the first sheet while air is being sucked from the other surface side of the first sheet. Effect of the Invention

[0008] According to the present invention, in a sheet transport process, it is possible to fix a functional liquid on a sheet so as to improve yield, and it is also possible to easily control the fixing position of the functional liquid. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing one embodiment of the method for producing a functional composite sheet of the present invention. [Diagram 2]FIG. 2 is a cross-sectional view showing a state in which a functional liquid is sprayed onto a first sheet while air is being sucked, and then the first sheet and the second sheet are bonded together. [Diagram 3] 3(a) and (b) are cross-sectional views that diagrammatically show structures of first sheets having different degrees of fiber contact angle. [Figure 4] 4(a) to (c) are plan views that diagrammatically show various modes for cutting off the trim from the laminate sheet. [Diagram 5] 1 is a graph showing the fixing rate of a fragrance in the functional composite sheets obtained in the Examples and Comparative Examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. 1 and 2 show an example of a manufacturing apparatus suitable for use in the manufacturing method of the present invention. In the manufacturing apparatus 10 of the embodiment shown in these figures, a long first sheet 110, which is a component of the functional composite sheet 1, is processed while being continuously conveyed, and the first sheet 110 is joined to a second sheet 120, which is another component of the functional composite sheet 1, to produce a continuous laminate sheet 100. The produced laminate sheet 100 is cut into individual sheets. These individual sheets are the desired functional composite sheet 1.

[0011] The manufacturing apparatus 10 has an adhesive application section 20, a liquid spraying section 30, a suction section 40, a sheet bonding section 50, a trim cutting section 60, and a trim recovery section 70, which are arranged along the conveying direction R of the first sheet 110. However, the liquid spraying section 30 and the suction section 40 are located at the same position along the conveying direction R of the first sheet 110. Each part of the manufacturing apparatus 10 will be described below.

[0012] The adhesive applying section 20 has an adhesive applying device 22 that applies an adhesive 21 to the first sheet 110 .

[0013] The liquid spraying section 30 has a liquid spraying device 32 that sprays the functional liquid 31 on the first sheet 110. For example, a two-fluid air spray device is used as the liquid spraying device 32. The two-fluid air spray device is generally a spraying device having a nozzle that mixes and sprays liquid and gas, and has a structure that mixes liquid and gas inside the nozzle. It is not prevented to use other liquid spraying devices instead of the two-fluid air spray device as the liquid spraying device 32. For example, an ultrasonic spray may be used as the liquid spraying device. Regardless of the type of liquid spraying device used, the liquid spraying device is installed at a distance from the first sheet 110. In other words, the liquid spraying device and the first sheet 110 are in a non-contact state. Applying the functional liquid 31 to the first sheet 110 using a liquid spraying device has technical significance in that the liquid spraying device is less likely to be contaminated. In addition, it also has technical significance in that the functional liquid 31 can be applied over a wide area and that the functional liquid 31 can easily penetrate the first sheet 110 in the thickness direction.

[0014] The suction unit 40 has a suction device 41 that sucks the air 33. For example, a vacuum conveyor can be used as the suction device 41. The vacuum conveyor generally comprises an endless belt 41a having air permeability, and a suction box 41b installed within the orbit of the endless belt 41a. The endless belt 41a may be, for example, a wire mesh belt made of a woven fabric of metal wires or synthetic resin wires. The suction box 41b has a structure capable of sucking air 33 from the surface facing the liquid spraying device 32. As described above, the suction unit 40 is disposed at a position facing the liquid spraying unit 30 with the first sheet 110 sandwiched therebetween. Various suction devices may be used as the suction device 41. In particular, by using a vacuum conveyor as the suction device to simultaneously transport the sheet and suck air, it is possible to efficiently suck air while suppressing disturbance of the sheet transport and wrinkling.

[0015] In the sheet bonding section 50, the first sheet 110 and the second sheet 120, both of which are transported in the same direction R, are overlapped and bonded together with an adhesive 21. For this purpose, the sheet bonding section 50 may be provided with a pair of nip rolls (not shown) for nipping and pressing the overlapped first sheet 110 and second sheet 120.

[0016] In the trim cutting section 60, a part of the laminate sheet 100 formed by laminating the first sheet 110 and the second sheet 120 is cut off. For this purpose, the trim cutting section 60 has a cutting device 61. As the cutting device 61, for example, a combination of a cutter roll 62 and an anvil roll 63 is used. In this case, the cutter roll 62 and the anvil roll 63 are arranged at positions facing each other with the laminate sheet 100 therebetween. In FIG. 1, the laminate sheet 100 is separated into individual sheets by the cutting device 61. However, instead of this, a trimming step and a sheet cutting step may be carried out in sequence.

[0017] The trim collecting section 70 has a trim collecting device 71 for collecting the trim 72 generated in the trim cutting section 60 described above.

[0018] Next, a preferred embodiment of the manufacturing method of the present invention will be described taking as an example a method for manufacturing the functional composite sheet 1 using the above-mentioned manufacturing apparatus 10. The manufacturing method of the functional composite sheet 1 of this embodiment includes an adhesive application step, a liquid spraying step, and a bonding step in this order.

[0019] 1, in the adhesive application step, while a long first sheet 110 is being transported in one transport direction R, an adhesive 21 is applied to one surface F1 of the first sheet 110 onto which a functional liquid 31, which will be described later, is to be sprayed (hereinafter, this surface will also be referred to as the "first surface") by an adhesive applicator 22 installed in an adhesive application section 20. Specifically, the adhesive 21 is applied in a predetermined application pattern continuously or intermittently along the transport direction R of the first sheet 110, so that an adhesive-applied region 111 where the adhesive 21 is applied and an adhesive-unapplied region 112 where the adhesive 21 is not applied are generated on the first surface F1 of the first sheet 110.

[0020] 2, in the liquid spraying step, functional liquid 31 is sprayed toward the first surface F1, which is the surface to which adhesive 21 has been applied in the adhesive application step, and the functional liquid 31 is retained on the first sheet 110. Specifically, the functional liquid 31 is sprayed onto the first surface F1 of the first sheet 110 during transportation by a liquid spraying device 32, such as a two-fluid air spray device. Simultaneously with or prior to this operation, a suction box 41b, which is a suction device 41, is operated to suck air 33 from the other surface F2 side of the first sheet 110 (hereinafter, this surface will also be referred to as the "second surface")

[0021] When the functional liquid 31 is sprayed on the first surface F1 of the first sheet 110, air 33 is sucked from the second surface F2 of the first sheet 110, so that air currents with different suction powers can be generated between the adhesive-applied region 111 and the adhesive-non-applied region 112. Specifically, the adhesive-applied region 111, which is an area where the adhesive-applied layer inhibits ventilation, generates an air current with higher suction power in the adhesive-non-applied region 112 where no adhesive is applied. As a result, the fine particles of the functional liquid 31 sprayed from the liquid spraying device 32 selectively adhere to the adhesive-non-applied region 112, which is an area with higher suction power. This allows the application range of the functional liquid 31 continuously sprayed from the liquid spraying device 32 to be controlled, and the functional liquid 31 to be intensively adhered to the adhesive-non-applied region 112. If the functional liquid is unintentionally adhered to the adhesive-applied region 111, the adhesive performance of the adhesive may be reduced, so that intensive adhesion of the functional liquid 31 to the adhesive-non-applied region 112 is of great technical significance. Furthermore, when the functional liquid 31 is sprayed onto the first surface F1 of the first sheet 110, air 33 can be sucked in from the second surface F2 side of the first sheet 110, thereby preventing the functional liquid 31 from adhering to the area corresponding to the trim 72 to be cut off by the trim cutting section 60 described above. This is of great technical significance from the viewpoint of reducing loss of the functional liquid 31.

[0022] Furthermore, according to this embodiment, by sucking air 33 from the second surface F2 side, which is the back surface of first sheet 110, there is an advantage that disturbance of sheet 110 and scattering of functional liquid 31 can be suppressed even when a two-fluid sprayer, which generally has a high liquid flow rate and is prone to disturbance of the sheet and scattering of the sprayed liquid, is used as liquid spraying device 32. This effect is particularly noticeable when a vacuum conveyor is used.

[0023] The various advantages provided by this embodiment are realized only by performing the liquid spraying step after the adhesive application step. In other words, even if the adhesive application step is performed after the liquid spraying step, the various advantages provided by this embodiment are not realized or are realized to a very low extent. However, in the present invention, it is not prohibited to provide a new step of applying an adhesive after the liquid spraying step.

[0024] The suction of the air 33 from the back surface of the first sheet 110 by the suction device 41 may be continuous or intermittent. For example, when the adhesive-applied region 111 and the adhesive-non-applied region 112 are formed on the first sheet 110, the suction can be controlled on and off by stopping the suction when the adhesive-applied region 111 passes over the suction device 41 and by starting the suction when the adhesive-non-applied region 112 passes over the suction device 41. However, since the adhesive-applied region 111 is generally a region that has low or no air permeability, even if the suction device 41 is operated when the adhesive-applied region 111 passes over the suction device 41, the suction of the air 33 through the adhesive-applied region 111 does not easily occur, so there is no problem in continuously suctioning the adhesive-applied region 111 and the adhesive-non-applied region 112. In other words, the present invention has a technical significance in that the functional liquid can be selectively applied even when continuous suction, which is a simpler control than intermittent suction, is performed.

[0025] There is no particular limitation on the type of functional liquid 31, and an appropriate one is selected depending on the specific application of the intended functional composite sheet. Examples of the functional liquid 31 include a liquid containing a fragrance, an oil agent for controlling hydrophilicity, and a liquid containing an antibacterial component. When the functional liquid 31 contains a fragrance, there is generally a problem that the fragrance tends to transfer its odor to the manufacturing apparatus 10. However, in the present manufacturing method, the suction device 41 is used to suction the air 33, which prevents the sprayed fragrance from scattering in the surrounding area and also removes it by suction, which has the advantage that such a problem is unlikely to occur.

[0026] It is preferable that the fiber contact angle of the fibers constituting the first sheet 110 is controlled. Specifically, it is preferable that the fiber contact angle of the first sheet 110 is smaller on the first surface F1 side where the functional liquid 31 is sprayed than on the second surface F2 side where the functional liquid 31 is not sprayed. In the liquid spraying step, by spraying the functional liquid 31 on the first surface F1 side where the fiber contact angle is smaller, the functional liquid 31 attached to the first sheet 110 is less likely to penetrate to the second surface F2 side, so that the strike-through of the functional liquid 31 is suppressed, and the functional liquid 31 can be easily wetted and spread on the first surface F1 side of the first sheet 110. In this specification, the fiber contact angle refers to the contact angle with water measured on the fibers that make up the first sheet 110. The measurement method will be described later.

[0027] 3(a) and (b) show cross-sectional views along the thickness direction of various first sheets 110 in which the contact angles of the constituent fibers are controlled. 3(a), the first sheet 110 is formed by overlapping two layers each containing fiber A and fiber B having different fiber contact angles. Of the two-layer sheet 110, fiber A contained in the upper first layer 115A has a smaller fiber contact angle than fiber B contained in the lower second layer 115B. In the figure, the surface of the first layer 115A is the first surface F1, and the surface of the second layer 115B is the second surface F2.

[0028] 3(b), the first sheet 110 has a single-layer structure, and the fiber contact angle changes stepwise along the thickness direction of the first sheet 110. Specifically, with the boundary at approximately the center along the thickness direction of the first sheet 110, the fiber contact angle becomes smaller stepwise on the upper first surface F1 side than on the lower second surface F2 side.

[0029] The method for measuring the fiber contact angle is as follows. The measurement device used is an automatic contact angle meter MCA-J (product name) manufactured by Kyowa Interface Science Co., Ltd. Deionized water is used to measure the fiber contact angle. The amount of liquid discharged from the inkjet water droplet discharge unit (CTC-25, a pulse injector with a 25 μm orifice diameter, manufactured by Cluster Technology Co., Ltd.) is set to 10 picoliters, and the water droplets are dropped directly onto the fiber. The dropping behavior is recorded on a high-speed recording device connected to a horizontally installed camera. From the viewpoint of later image analysis, a personal computer with a built-in high-speed capture device is preferable as the recording device. In this measurement, images are recorded every 17 msec. In the recorded video, the first image in which the water droplets land on the fiber taken out of the nonwoven fabric is analyzed using the attached software FAMAS (software version 2.6.2, analysis method is the droplet method, analysis method is the θ / 2 method, image processing algorithm is non-reflective, image processing image mode is frame, threshold level is 200, curvature correction is not performed), and the angle between the surface of the water droplet in contact with the air and the fiber is calculated, which is the fiber contact angle. If the fiber taken out of the first sheet 110 has a length of 2 mm or more, it is cut to a fiber length of 2 mm, and the fiber is placed on the sample stage of the contact angle meter and maintained horizontally. The contact angles are measured at three different points for each fiber, and the average value (rounded off to two decimal places) is defined as the fiber contact angle.

[0030] In order to adjust the fiber contact angle of the fibers constituting the first sheet 110, a suitable hydrophilizing agent may be applied to the surface of the fibers, or a suitable hydrophilizing agent may be mixed into the resin constituting the fibers.

[0031] In the bonding process, the first sheet 110, which has been coated with the adhesive 21 and sprayed with the functional liquid 31, is directly bonded to the second sheet 120 to obtain a long laminate sheet 100 holding the functional liquid 31. Specifically, as shown in FIG. 1, in the sheet bonding section 50, the first surface F1 of the first sheet 110 holding the functional liquid 31 and one surface of the second sheet 120 are bonded so as to come into direct contact with each other without any other member or the like. As described above, since the functional liquid is selectively applied to the non-adhesive application area, in this process, the effect of the present invention that the adhesive performance of the adhesive is guaranteed when the first sheet and the second sheet are bonded becomes prominent.

[0032] After a long piece of the laminate sheet 100 is obtained by the bonding step, a trim cutting step is then performed on the laminate sheet 100. The trim cutting step refers to cutting and separating a part of the laminate sheet 100, specifically, a part (i.e., trim) 72 that is not required for the intended functional composite sheet 1. 1, in the trim cutting step, a predetermined portion (trim 72) of the laminate sheet 100 being conveyed is intermittently cut in a trim cutting section 60 to obtain the desired functional composite sheet 1. The cut trim 72 is collected by a collection device 71.

[0033] In the trim cutting step, it is preferable that the cutting region for cutting out the laminate sheet 100 includes at least a part of the adhesive application region 111 of the first sheet 110. In particular, it is preferable that the adhesive application region 111 is formed so as to straddle the cutting region in the trim cutting step and the other region. This makes it possible to prevent the functional liquid 31 from adhering to the cutting region and to bond the first sheet 110 and the second sheet 120 in a single bonding step. Another advantage is that the trim of the first sheet and the trim of the second sheet do not separate and can be collected as a unit.

[0034] There are various combinations of the pattern of the adhesive application area 111 for adhering the first sheet 110 and the second sheet 120 and the pattern of the trim cutting area. Some examples are shown in Figures 4(a) to 4(c). In these figures, the symbol R indicates the sheet conveying direction.

[0035] In the embodiment shown in FIG. 4(a), adhesive is applied to the peripheral regions along the long and short sides of the first sheet 110 in a generally rectangular shape to form adhesive application regions 111. Next, functional liquid 31 is sprayed onto the non-adhesive-coated areas 112 to form liquid-sprayed areas 113 . Next, the second sheet 120 is superimposed on the first sheet 110 to form the laminate sheet 100, and then an area including the liquid sprayed area 113 and part of the adhesive applied area 111 is punched out into an approximately rectangular shape (shown by dashed lines in Figures 4(a) to (c)), and the cut-out area 116, which is the remaining part of the adhesive applied area 111, is cut out.

[0036] In the embodiment shown in FIG. 4(b), first, an adhesive is applied to the peripheral region along the long side of the first sheet 110 to form a pair of band-shaped adhesive application regions 111. Next, the functional liquid 31 is sprayed onto the adhesive non-coated area 112 that is the area sandwiched between the pair of adhesive coated areas 111 to form a liquid sprayed area 113 . Next, the second sheet 120 is superimposed on the first sheet 110 to form the laminate sheet 100, and then, of each adhesive application region 111, a cut-out region 116, which is an area on the outer side in the width direction and extending in the longitudinal direction, is cut out.

[0037] 4(c), first, adhesive is applied to the peripheral regions of the four sides of the first sheet 110 in a substantially rectangular shape, and adhesive is applied to the central region in a direction perpendicular to the conveying direction R along the conveying direction R to form an adhesive-coated region 111. As a result, two rectangular adhesive-free regions 112 are formed. Next, the functional liquid 31 is sprayed onto the non-adhesive coated area 112 to form two liquid sprayed areas 113 . Next, the second sheet 120 is superimposed on the first sheet 110 to form the laminate sheet 100, and then, from the adhesive application region 111, a cut-out region 116 that is a part of the rectangular portion is cut out.

[0038] Next, various materials and the like used in the method for producing the functional composite sheet 1 of the present invention will be described.

[0039] The first sheet 110 can be composed of, for example, a breathable resin film, a fiber sheet, or a laminate thereof. Examples of the resin film include breathable films made of polymeric materials such as polyethylene terephthalate (PET), polyester, polyethylene (PE), polypropylene, cellophane, nylon, polyvinyl alcohol, polyvinyl chloride, and polycarbonate. Examples of the fiber sheet include spunbond nonwoven fabric, air-through nonwoven fabric, spunlace nonwoven fabric, heat-rolled nonwoven fabric, melt-blown nonwoven fabric, and laminated nonwoven fabrics thereof.

[0040] The suitable constituent materials of the first sheet 110 are as described above, and the second sheet 120 is preferably a sheet containing pulp fibers on its outer surface from the viewpoint of facilitating favorable absorption and retention of the functional liquid 31 on the second sheet 120 side in the above-mentioned bonding step and preventing the functional liquid 31 from seeping through the first sheet 110. In particular, it is preferable that at least the outer surface of the second sheet 120 that comes into contact with the first sheet 110 is composed of pulp fibers. Pulp fibers are made of cellulose, and cellulose molecules contain many methylidyne groups that are highly lipophilic. Since methylidyne groups have a high affinity for the aromatic components of fragrances, the presence of pulp fibers on the outer surface of second sheet 120 allows the applied functional liquid 31, when it is a fragrance, to be well retained. As a configuration containing pulp fibers on the outer surface of the second sheet 120, paper may be used alone. It is also preferable to use a laminate sheet of a non-breathable resin film and paper as the second sheet 120. In particular, when the functional composite sheet 1 is used as a material for manufacturing a heating tool described later, by using the second sheet 120 in such a form, the second sheet 120 becomes non-breathable, and it becomes easy to appropriately control the heat generation of the heating section included in the heating tool.

[0041] Examples of the adhesive 22 used to bond the first sheet 110 and the second sheet 120 include a water-based adhesive and an organic adhesive. Which adhesive to use is appropriately determined depending on the constituent materials of the first sheet 110 and the second sheet 120.

[0042] The fragrance that can be contained in the functional liquid 31 can be one that contains an aromatic component that volatilizes into the air under atmospheric pressure. The aromatic component can be one whose scent can be perceived under normal temperature and pressure conditions. Examples of the aromatic components that make up fragrances include those listed in “Synthetic Fragrance Chemistry and Product Knowledge” (edited by the Synthetic Fragrance Editorial Committee, Chemical Daily, revised and expanded edition, December 20, 2016). Specifically, examples of aromatic components include terpene hydrocarbons, aldehydes, phenols, lactones, and the like. Examples of terpene hydrocarbons include myrcene, farnesene, pinene, limonene, camphene, phellandrene, terpinene, terpinolene, p-cymene, cedrene, and caryophyllene. Examples of aldehydes include hexylcinnamic aldehyde, 2-methyl-3-(4-tert-butylphenyl)-propanal, 4-(4-hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde, and vanillin. Examples of phenols include aromatic alcohols such as anethole and eugenol. Examples of aromatic alcohols anethole or eugenol include benzyl alcohol, phenylethyl alcohol, pamplefleur (2-methyl-4-phenylpentanol), dimethylbenzylcarbinol, and phenylhexanol (3-methyl-5-phenylpentanol). Examples of lactones include γ-nonalactone and γ-undecalactone. The fragrance also includes "a combination of fragrance materials composed of multiple fragrances (fragrance composition) that is diluted and adjusted with a solvent." For example, fragrance compositions having a rose, lavender, jasmine, or ylang-ylang-like scent can be used as fragrances.

[0043] The functional composite sheet 1 manufactured by the above method may be used alone, or may be further processed to manufacture other articles. For example, a heating tool may be manufactured using the functional composite sheet 1 manufactured by the above method. Examples of such heating tools include so-called face mask types and eye mask types. This type of heating tool can be used to apply steam heated to a predetermined temperature to the skin of the target area, such as the human nose and mouth, or both eyes or areas nearby, by covering the target area.

[0044] A heating tool typically includes a top sheet that faces a heated object such as the user's skin when the heating tool is in use, and a back sheet that is located on the side farther from the heated object. When a heating tool including these sheets is manufactured using the functional composite sheet 1, the above-mentioned first sheet 110 and second sheet 120 can be used as the top sheet and back sheet.

[0045] The heating tool typically has a heating section capable of generating steam as heat is generated. The heating section is configured to generate steam heated to a predetermined temperature as heat is generated due to an oxidation reaction with oxygen in the air. In detail, the heating section includes an oxidizable metal that generates heat due to an oxidation reaction with oxygen in the air, activated carbon, and, as necessary, an electrolyte and water.

[0046] When manufacturing a heating tool using the functional composite sheet 1, the manufacturing method preferably includes a step of supplying a heating element after the liquid spraying step. In detail, after spraying the functional liquid 31 on the first sheet 110 according to the above-mentioned procedure, it is preferable to intermittently arrange heating parts in the form of a heating sheet or a heating composition at a predetermined interval along the conveying direction R between the first sheet 110 and the second sheet 120 conveyed along the conveying direction R, prior to bonding the first sheet 110 and the second sheet 120. For example, in FIG. 4(c), it is preferable to arrange the heating parts in the adhesive-free region indicated by the reference numeral 112. Such a manufacturing method for a heating tool is described, for example, in FIG. 10 of the above-mentioned Patent Document 3.

[0047] When manufacturing a heating tool using the functional composite sheet 1, the manufacturing apparatus 10 preferably further includes an ear-hook forming section. The ear-hook forming section is for supplying a long strip-shaped raw material of ear-hook sheet for forming an ear-hook portion to the surface of the top sheet on which the heating element is not disposed, to form an ear-hook portion made of a sheet material.

[0048] Although the present invention has been described based on the preferred embodiment, the present invention is not limited to the above embodiment. For example, the functional liquid 31 can be applied intermittently along the transport direction R, but is not limited to this, and may be applied in stripes (bands), scattered dots, checkered patterns, or the like. EXAMPLES

[0049] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited to these examples.

[0050] [Examples 1 to 9] In Examples 1 to 9, the functional composite sheet 1 was produced using the apparatus shown in Figures 1 and 2. However, for convenience, the trim was not removed. Therefore, strictly speaking, these Examples should be called "model Examples". The first sheet 110 has a basis weight of 30 g / m 2The second sheet 120 was a PET / PE blend nonwoven fabric having a basis weight of 60 g / m 2 The PET / PE blend nonwoven fabric was used. HM-DispoMelt ME716E (manufactured by Henkel Corporation) was used as the adhesive 21. A fragrance (oil-soluble fragrance with a viscosity of 20 mPa·s at 25°C) was used as it was as the functional liquid 31. While conveying the first sheet 110 at a conveying speed of 30 m / min so that a liquid sprayed region 113 was formed on the first sheet 110, the adhesive 21 was applied to the first surface F1 of the first sheet 110 in the pattern shown in FIG. 4(a). Next, using a two-fluid air spray device, the functional liquid 31 was sprayed continuously across the adhesive application region and the adhesive non-application region. The spray air pressure was as shown in Table 1 below. The length of the adhesive application region 111 along the conveying direction R was set to 100 mm. While spraying the functional liquid 31, air was sucked from the second surface F2 side of the first sheet 110 using a vacuum conveyor. The suction pressure was as shown in Table 1 below. The second sheet 120 was superimposed on the first surface F1 of the first sheet 110 to obtain a laminate sheet 100. The laminate sheet 100 was cut into a predetermined shape to obtain the desired functional composite sheet 1. The wet weight W2 of the obtained functional composite sheet 1 was measured, and then it was dried for 3 days at 70° C. Thereafter, the dry mass W1 of the functional composite sheet 1 was measured, and W1 was subtracted from the wet mass W2 of the functional composite sheet 1 before drying to calculate the mass W3 of the fragrance fixed to the functional composite sheet 1. The fragrance fixation rate was calculated from the mass W3 of the fragrance fixed to the functional composite sheet 1 and the value obtained by dividing the pre-measured amount of fragrance sprayed per minute by the number of functional composite sheets processed per minute. The results are shown in Figure 5. The average value of the five samples was calculated and this value was taken as the fixation rate.

[0051] [Table 1]

[0052] Comparative Example 1 A functional composite sheet 1 was obtained in the same manner as in Example 1, except that air was not suctioned from the second surface F2 side of the first sheet 110. The fixation rate of the fragrance in this functional composite sheet 1 was measured in the same manner as in Example 1. The results are shown in FIG.

[0053] As is clear from the results shown in Fig. 5, it can be seen that according to each Example, the fragrance can be fixed to the sheet at an extremely high rate. In Comparative Example 1, the functional liquid 31 was scattered and a large loss was observed. [Explanation of symbols]

[0054] 1. Functional composite sheet 21 Adhesive 31 Functional liquids 33 Air 40 Suction part 50 Sheet bonding section 110 Sheet 1 F1 front page F2 2nd side 111 Adhesive application area 112 Adhesive-free area 120 2nd Sheet

Claims

1. An adhesive application step of applying an adhesive to one surface of the first sheet while conveying the long first sheet, and a liquid spraying step of spraying a functional liquid toward the one surface to which the adhesive has been applied in the adhesive application step and causing the first sheet to hold the functional liquid, and an adhesion step of joining the first sheet holding the functional liquid and the second sheet with the adhesive applied to the first sheet, the method for manufacturing a functional composite sheet comprising: In the adhesive application step, the adhesive is applied so that an application region where the adhesive is applied and a non-application region where the adhesive is not applied are formed, In the liquid spraying step, the functional liquid is sprayed toward the one surface side while sucking air from the other surface side of the first sheet, the method for manufacturing a functional composite sheet.

2. A trim cutting step of obtaining a laminated sheet by adhering the first sheet and the second sheet in the adhesion step and cutting and recovering a part of the laminated sheet, In the trim cutting step, at least a part of the application region of the adhesive on the first sheet is included in the cutting region in the laminated sheet, the method for manufacturing a functional composite sheet according to Claim 1.

3. In the adhesive application step, the application region of the adhesive is formed so as to straddle the cutting region and other regions in the trim cutting step, the method for manufacturing a functional composite sheet according to Claim 2.

4. In the liquid spraying step, a two-fluid air spray device is used as the spraying device for the functional liquid, the method for manufacturing a functional composite sheet according to any one of Claims 1 to 3.

5. In the liquid spraying step, a vacuum conveyor is used as the suction device for sucking the air from the other surface side of the first sheet, the method for manufacturing a functional composite sheet according to any one of Claims 1 to 3.

6. As the second sheet, a sheet containing pulp fibers on the outer surface is used, In the adhesion step, the outer surface of the second sheet is directly adhered to the one surface of the first sheet, the method for manufacturing a functional composite sheet according to any one of Claims 1 to 3.

7. In the state before spraying of the functional liquid, the fiber contact angle of the first sheet is smaller on the one surface side than on the other surface side, the method for manufacturing a functional composite sheet according to any one of Claims 1 to 3.

8. A method for manufacturing a heating device including a functional composite sheet and a heating element, The method for manufacturing a heating device includes a step of obtaining the functional composite sheet by the method for manufacturing the functional composite sheet according to any one of claims 1 to 3.

Images