Method and apparatus for manufacturing adhesives, and method for bonding fabrics.

Abstract

Disclosed is a method for manufacturing a bonded body. The method for manufacturing a bonded body comprises: a first step for coating a hot melt adhesive on a first surface treatment area of a first fabric that has the first surface treatment area on its surface, thereby forming an adhesive layer; and a second step for placing a second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer to obtain a bonded body. In the method for manufacturing a bonded body, the second fabric may have a second surface treatment area on its surface. In this case, the second step can be a step in which the second surface treatment area of the second fabric is placed on the adhesive layer.

Description

[Technical Field]

[0001] This disclosure relates to a method for manufacturing an adhesive and an apparatus for manufacturing an adhesive, as well as a method for bonding fabrics. [Background technology]

[0002] Hot-melt adhesives are solvent-free adhesives, thus having a low impact on the environment and human health, and their ability to bond quickly makes them suitable for improving productivity. Hot-melt adhesives can be broadly classified into two types: those primarily composed of thermoplastic resins and those primarily composed of reactive resins. As reactive resins, urethane prepolymers with isocyanate groups at their ends are mainly used.

[0003] Hot melt adhesives are used in a variety of fields, including, for example, clothing (particularly seamless clothing that does not require sewing). For instance, Patent Documents 1 and 2 disclose clothing in which fabrics are bonded together with hot melt adhesive. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2017-186695 [Patent Document 2] Japanese Patent Publication No. 2010-203008 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, when bonding fabrics together using hot melt adhesives, the resulting adhesive strength varies depending on the fabric, and some fabrics may be difficult to bond. Therefore, even when using such fabrics, it is necessary to achieve high adhesive strength in the resulting bonded material.

[0006] Therefore, the main objective of this disclosure is to provide a method for manufacturing an adhesive that can exhibit high adhesive strength in an adhesive obtained by bonding fabrics together via a hot melt adhesive. [Means for solving the problem]

[0007] As a result of analyzing many fabrics, the inventors of this disclosure found a correlation between the surface treatment of the fabric surface and the resulting adhesive strength. For example, it was found that the greater the surface roughness of the fabric, the higher the adhesive strength tended to be, and that in fabrics having roughened regions (regions on the surface that have been roughened by physical methods), applying a hot melt adhesive to the roughened regions resulted in an adhesive body that exhibited high adhesive strength. On the other hand, it was found that in fabrics having modified regions (regions on the surface that have been modified by methods such as plasma treatment), applying a hot melt adhesive to the modified regions resulted in an adhesive body that exhibited high adhesive strength.

[0008] One aspect of this disclosure relates to a method for manufacturing an adhesive. The method for manufacturing the adhesive comprises a first step of applying a hot melt adhesive to a first surface-treated area (an area on the surface to which a surface treatment has been applied) of a first fabric having a first surface-treated area on its surface to form an adhesive layer, and a second step of placing a second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer to obtain an adhesive. By using such a method for manufacturing an adhesive, it is possible to achieve high adhesive strength in the resulting adhesive.

[0009] In the method for manufacturing an adhesive, the second fabric may have a second surface treatment area (an area on the surface that has been surface-treated). In this case, the second step may be a step of placing the second surface treatment area of ​​the second fabric on the adhesive layer. This makes it possible to achieve even higher adhesive strength in the resulting adhesive.

[0010] In a method for manufacturing an adhesive, one aspect of the first surface treatment region is a first roughened region formed by roughening the surface of a first fabric. In such a method for manufacturing an adhesive, the reason why high adhesive strength can be achieved is not entirely clear, but it is thought that the presence of the first roughened region in the first fabric makes it easier for the hot melt adhesive to penetrate the first fabric, thereby increasing the anchoring effect. When the first surface treatment region has a first roughened region and the second fabric has a second surface treatment region, the second surface treatment region may be a second roughened region or a second modified region, and is preferably a second roughened region.

[0011] In the method for manufacturing an adhesive, another aspect of the first surface treatment region is a first modified region formed by applying a modification treatment to the surface of the first fabric. The reason why high adhesive strength can be achieved in such a method for manufacturing an adhesive is not entirely clear, but it is thought that the presence of the first modified region in the first fabric introduces polar functional groups (e.g., hydroxyl groups, carbonyl groups, carboxyl groups, etc.) that contribute to adhesion to the surface of the first fabric, improving the affinity (wettability) of the hot melt adhesive to the fabric surface, and resulting in the formation of chemical bonds such as hydrogen bonds between the first fabric and the hot melt adhesive. When the first surface treatment region has a first modified region and the second fabric has a second surface treatment region, the second surface treatment region may be a second roughened region or a second modified region, and is preferably a second modified region.

[0012] Another aspect of this disclosure relates to an apparatus for manufacturing an adhesive. The apparatus for manufacturing an adhesive includes, in this order, an adhesive layer forming unit that applies a hot melt adhesive to a first surface treatment area of ​​a first fabric having a first surface treatment area on its surface, along the transport direction of the first fabric, to form an adhesive layer, and a crimping unit that places a second fabric on the adhesive layer and crimps the first fabric and the second fabric together via the adhesive layer.

[0013] In an adhesive manufacturing apparatus, the second fabric may have a second surface treatment area on its surface. In this case, the crimping section may place the second surface treatment area of ​​the second fabric on the adhesive layer and crimp the first fabric and the second fabric together via the adhesive layer.

[0014] The adhesive manufacturing apparatus may further include a surface treatment area forming unit that forms a first surface treatment area by applying a surface treatment to the surface of a first fabric prior to the adhesive layer forming unit. In the adhesive manufacturing apparatus, one embodiment of the surface treatment area forming unit is a roughening area forming unit that forms a first roughened area by applying a roughening treatment to the surface of a first fabric. In the adhesive manufacturing apparatus, another embodiment of the surface treatment area forming unit is a modification area forming unit that forms a first modified area by applying a modification treatment to the surface of a first fabric.

[0015] Another aspect of the present disclosure relates to a method for bonding a first fabric and a second fabric via a hot-melt adhesive. The method for bonding fabrics comprises a first step of applying a hot-melt adhesive onto a first surface-treated area of ​​a first fabric having a first surface-treated area on its surface to form an adhesive layer, and a second step of placing a second fabric on the adhesive layer to bond the first fabric and the second fabric via the adhesive layer. In the method for bonding fabrics, the second fabric may have a second surface-treated area on its surface. In this case, the second step may be a step of placing a second surface-treated area of ​​the second fabric on the adhesive layer.

[0016] In a method for bonding fabrics, one embodiment of the first surface treatment region is a first roughened region formed by applying a roughening treatment to the surface of the first fabric. When the first surface treatment region has a first roughened region and the second fabric has a second surface treatment region, the second surface treatment region may be a second roughened region or a second modified region, and is preferably a second roughened region.

[0017] In the method of bonding fabrics, another aspect of the first surface treatment region is a first modified region formed by subjecting the surface of the first fabric to a modification treatment. When the first surface treatment region has the first modified region and the second fabric has the second surface treatment region, the second surface treatment region may be a second roughened region or a second modified region, and preferably a second modified region.

Advantages of the Invention

[0018] According to the present disclosure, there is provided a method for manufacturing an adhesive body capable of exhibiting a high adhesive strength in an adhesive body obtained by bonding fabrics via a hot-melt adhesive. Further, according to the present disclosure, there is provided an adhesive body manufacturing apparatus capable of efficiently implementing such a manufacturing method. Furthermore, according to the present disclosure, there is provided a method for bonding fabrics capable of exhibiting a high adhesive strength.

Brief Description of the Drawings

[0019] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of an adhesive body manufacturing apparatus. [Figure 2] FIG. 2 is a schematic diagram showing another embodiment of the adhesive body manufacturing apparatus.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present disclosure will be described. However, the present disclosure is not limited to the following embodiments.

[0021] In this specification, numerical ranges indicated using "~" represent a range that includes the numbers before and after "~" as the minimum and maximum values, respectively. In numerical ranges described stepwise in this specification, the upper or lower limit of one step may be replaced with the upper or lower limit of another step. Also, in numerical ranges described in this specification, the upper or lower limit of that range may be replaced with the values ​​shown in the examples. Furthermore, the upper and lower limits described individually can be combined in any way. Also, "A or B" means that either A or B is included, or both are included. Furthermore, unless otherwise specified, the materials exemplified below may be used individually or in combination of two or more. The content of each component in the composition means the total amount of multiple substances present in the composition if there are multiple substances corresponding to each component in the composition, unless otherwise specified.

[0022] [Method for manufacturing adhesive] A method for manufacturing an adhesive according to one embodiment comprises a first step of applying a hot melt adhesive to a first surface treatment area of ​​a first fabric having a first surface treatment area on its surface to form an adhesive layer, and a second step of placing a second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer to obtain an adhesive. The second fabric may have a second surface treatment area on its surface. In this case, the second step may be a step of placing the second surface treatment area of ​​the second fabric on the adhesive layer.

[0023] (Hot melt adhesive) The hot melt adhesive may be a moisture-curing hot melt adhesive containing a urethane prepolymer. Generally, moisture-curing hot melt adhesives can develop high molecular weight through chemical reactions and exhibit adhesive strength, etc. Here, since the urethane prepolymer having an isocyanate group hardens upon reaction with moisture (forming a cured product), the moisture-curing hot melt adhesive may consist of the urethane prepolymer alone, or it may contain additives used in the field of moisture-curing hot melt adhesives in addition to the urethane prepolymer.

[0024] The urethane prepolymer may be a reaction product of a polyol and a polyisocyanate. For example, the urethane prepolymer may be a urethane prepolymer having isocyanate groups. A urethane prepolymer having isocyanate groups typically has a polymerization chain containing structural units derived from a polyol (a compound having two or more hydroxyl groups in its molecule) and structural units derived from a polyisocyanate (a compound having two or more isocyanate groups in its molecule), and isocyanate groups. The isocyanate groups may be bonded to the ends of the polymerization chain. The composition of the urethane prepolymer can be changed by varying the type and content of the polyol that provides the polyol-derived structural units, and the type and content of the polyisocyanate that provides the polyisocyanate-derived structural units. Furthermore, since urethane bonds are formed by the reaction of the polyol and polyisocyanate, the polymerization chain of the urethane prepolymer has urethane bonds. Additionally, isocyanate groups can be introduced to the ends of the polymerization chain by increasing the ratio of the equivalent weight of polyisocyanate to the equivalent weight of polyol.

[0025] The viscosity of the hot melt adhesive at 120°C may be 0.01 Pa·s or higher, 0.05 Pa·s or higher, or 0.1 Pa·s or higher, and may be 30 Pa·s or lower, 20 Pa·s or lower, or 15 Pa·s or lower. Having the viscosity at 120°C within the above range improves the workability (handling) when applying the moisture-curing hot melt adhesive to the substrate using a dispenser or the like.

[0026] (material) In the method for manufacturing an adhesive, the first and second fabrics can be any fabric without particular limitations. The first and second fabrics may be the same fabric or different fabrics. The first and second fabrics may be two separate pieces or two different locations within a single, unseparated fabric. The method for manufacturing an adhesive according to this disclosure can produce high adhesive strength even when applied to fabrics that do not easily exhibit adhesive strength. Therefore, the first and second fabrics may be fabrics that do not easily exhibit adhesive strength (fabrics into which hot melt adhesive does not easily penetrate and which have a small anchoring effect). Fabrics that do not easily exhibit adhesive strength may, for example, be fabrics that have been treated with a water-repellent treatment (fluorine processing) or have a high density (for example, 0.4 g / cm³). 3 The above describes possible fabrics. If the first and second fabrics are different fabrics, it is preferable to select the fabric that has been treated with a water-repellent treatment (fluorine processing) or the fabric with a higher density as the first fabric. When a modification treatment is applied to the surface of the first fabric or the surface of the second fabric, the water-repellent effect (fluorine processing effect) can be reduced by plasma treatment, so the first or second fabric may be a fabric that has been treated with a water-repellent treatment (fluorine processing).

[0027] (First step) In this process, a hot-melt adhesive is applied to the first surface-treated area of ​​a first fabric having a first surface-treated area on its surface to form an adhesive layer. The surface refers to the side of the first fabric on which the adhesive layer is formed. The first fabric having a first surface-treated area on its surface may be prepared by preparing an untreated first fabric and applying a surface treatment to it, or it may be a first fabric that has already been surface-treated. The first surface-treated area may be provided on the entire surface of the first fabric, but from the viewpoint of efficiency, it is preferable that it be selectively provided in the area on the surface of the first fabric where the hot-melt adhesive is applied (the area where the adhesive layer is formed). In this case, the first fabric will have a first surface-treated area and a first un-surface-treated area on its surface. One embodiment of the first surface-treated area is a first roughened area formed by applying a roughening treatment to the surface of the first fabric. That is, the first fabric having a first surface-treated area on its surface may be the first fabric having a first roughened area on its surface. Another embodiment of the first surface treatment region is a first modified region formed by applying a modification treatment to the surface of the first fabric. That is, a first fabric having a first surface treatment region on its surface may be a first fabric having a first modified region on its surface.

[0028] • A first fabric having a first roughened region on its surface. In a first fabric having a first roughened region on its surface, the roughened region refers to a region that has undergone a roughening treatment and has a greater surface roughness than the region that has not undergone the roughening treatment (non-roughened region). Here, the surface roughness can be based on various surface roughness parameters as defined in ISO 25178, for example. The first roughened region may be provided over the entire surface of the first fabric, but from the viewpoint of efficiency, it is preferable that it be selectively provided in the region on the surface of the first fabric where the hot-melt adhesive is applied (the region where the adhesive layer is formed). In this case, the first fabric will have a first roughened region and a first non-roughened region on its surface. The shape of the first roughened region can be arbitrarily adjusted to match the shape of the adhesive layer that is formed.

[0029] The roughening treatment is not particularly limited as long as it can form a first roughened region on the surface of the first material, and can be arbitrarily selected according to the desired properties. Examples of roughening treatments include abrasion treatment with sandpaper, a metal rod (tweezers), etc., and compression treatment with a needle punch, etc. Since roughening treatment is simple and economical, abrasion treatment with sandpaper may be used. It is preferable to apply the various parameters specified in ISO 25178 in a way that increases the surface roughness.

[0030] When the roughening treatment is an abrasion treatment, it is preferable to perform the abrasion treatment on the first fabric in the transverse direction (perpendicular to the yarn bundle that has height in the thickness direction of the fabric) or the longitudinal direction (horizontal to the yarn bundle that has height in the thickness direction of the fabric). Since abrasion treatment can increase surface roughness and ultimately increase adhesive strength, it is preferable to perform it in the transverse direction (perpendicular to the yarn bundle that has height in the thickness direction of the fabric).

[0031] • A first fabric having a first modified region on its surface. In a first fabric having a first modified region on its surface, the modified region refers to a region that has undergone a modification treatment and, compared to a region that has not undergone modification treatment (unmodified region), for example, has a different contact angle (preferably a lower contact angle), a different surface free energy (preferably a higher surface free energy), and a different elemental composition (preferably a reduced proportion of fluorine). The first modified region may be provided over the entire surface of the first fabric, but from the viewpoint of efficiency, it is preferable that it be selectively provided in the region on the surface of the first fabric where the hot melt adhesive is applied (the region where the adhesive layer is formed). In this case, the first fabric will have a first modified region and a first unmodified region on its surface. The shape of the first modified region can be arbitrarily adjusted to match the shape of the adhesive layer that is formed.

[0032] The modification treatment is not particularly limited as long as it can form a first modified region on the surface of the first fabric, and can be arbitrarily selected according to the desired properties. Examples of modification treatments include plasma treatment, corona treatment, flame treatment, ultraviolet (UV) treatment, etc. From the viewpoint of efficiency, the modification treatment may be plasma treatment.

[0033] The modification treatment is preferably carried out based on, for example, the contact angle or surface free energy. The contact angle of water or diiodomethane in the first modification region may be 90° or less, 80° or less, 70° or less, or 60° or less. The surface free energy of the first modification region is 10 mJ / m 2 More than 20mJ / m 2 More than 30mJ / m 2 Above 40 mJ / m 2 The above is sufficient. Here, the contact angle and surface free energy can be measured or calculated by the method described in the examples.

[0034] When applying hot-melt adhesive, it is usually necessary to melt the adhesive before application. The temperature at which the hot-melt adhesive is melted may be, for example, 80 to 180°C.

[0035] The method for applying the hot melt adhesive may be, for example, coating. Examples of methods for applying the hot melt adhesive include using a dispenser, die coater, roll coater, spray, etc. Since the application method allows for application to narrow areas, using a dispenser is a suitable option.

[0036] (Second step) In this process, a second fabric is placed on the adhesive layer, and the first fabric and the second fabric are bonded together via the adhesive layer to obtain an adhesive body.

[0037] The second fabric may or may not have a second surface treatment area on its surface, but from the viewpoint of further enhancing adhesive strength, it is preferable to have a second surface treatment area on its surface. Note that "surface" refers to the surface of the second fabric that is positioned against the adhesive layer. The second fabric having a second surface treatment area on its surface may be prepared by preparing an untreated second fabric and then applying a surface treatment to it, or it may be a second fabric that has already been surface treated. The second surface treatment area may be provided across the entire surface of the second fabric, but from the viewpoint of efficiency, it is preferable to selectively provide it in the area on the surface of the second fabric that is in contact with the adhesive layer. In this case, the second fabric will have a second surface treatment area and a second unsurface treatment area on its surface. One embodiment of the second surface treatment area is a second roughened area formed by applying a roughening treatment to the surface of the second fabric. That is, the second fabric having a second surface treatment area on its surface may be a second fabric having a second roughened area on its surface. Another embodiment of the second surface treatment region is a second modified region formed by applying a modification treatment to the surface of the second fabric. That is, a second fabric having a second surface treatment region on its surface may be a second fabric having a second modified region on its surface.

[0038] • A second fabric having a second roughened area on its surface. In a second fabric having a second roughened region on its surface, the second roughened region may be provided over the entire surface of the second fabric, but from the viewpoint of efficiency, it is preferable that it be selectively provided in the region in contact with the adhesive layer on the surface of the second fabric. In this case, the second fabric will have a second roughened region and a second non-roughened region on its surface. The method for roughening the second fabric may be the same as the method for roughening the first fabric.

[0039] • A second fabric having a second modified region on its surface. In a second fabric having a second modified region on its surface, the second modified region may be provided over the entire surface of the second fabric, but from the viewpoint of efficiency, it is preferable that it be selectively provided in the region in contact with the adhesive layer on the surface of the second fabric. In this case, the second fabric will have a second modified region and a second unmodified region on its surface. The method for modifying the second fabric may be the same as the method for modifying the first fabric.

[0040] Next, the second fabric is placed on the adhesive layer. If the second fabric has a second roughened region on its surface, the second step may be the step of placing the second roughened region of the second fabric on the adhesive layer. If the second fabric has a second modified region on its surface, the second step may be the step of placing the second modified region of the second fabric on the adhesive layer. This makes it possible to achieve higher adhesive strength in the resulting adhesive.

[0041] If the first surface treatment region has a first roughening region and the second base material has a second surface treatment region, the second surface treatment region may be a second roughening region or a second modification region, preferably a second roughening region. If the first surface treatment region has a first modification region and the second base material has a second surface treatment region, the second surface treatment region may be a second roughening region or a second modification region, preferably a second modification region.

[0042] Next, the first fabric and the second fabric are bonded together via an adhesive layer to obtain an adhesive body. When bonding the first fabric and the second fabric via an adhesive layer, the adhesive layer is usually cured after the first and second fabrics are pressed together.

[0043] The conditions for pressing the first fabric and the second fabric together can be arbitrarily set, including temperature (pressure temperature), load (pressure load), and time (pressure time). For example, the temperature (pressure temperature) may be 30 to 60°C. For example, the load (pressure load) may be 20 to 120 N. For example, the time (pressure time) may be 1 to 20 seconds.

[0044] The adhesive layer can be cured by leaving it in the air, as the isocyanate groups of the urethane prepolymer react with moisture in the air or on the surface of the substrate. For example, it can also be cured by curing it in a constant temperature bath at 23°C and 50% RH for one day.

[0045] This method of manufacturing adhesives makes it possible to achieve high adhesive strength in the resulting adhesive. The reason for this effect is not entirely clear, but it is thought that when the first fabric has a first roughened region, the hot melt adhesive penetrates the first fabric more easily, resulting in a greater anchoring effect. When the second fabric has a second roughened region, a similar effect occurs, making it possible to achieve even higher adhesive strength in the resulting adhesive. On the other hand, when the first fabric has a first modified region, it is thought that polar functional groups that contribute to adhesion (e.g., hydroxyl groups, carbonyl groups, carboxyl groups, etc.) are introduced to the surface of the first fabric, improving the affinity (wettability) of the hot melt adhesive to the fabric surface, and resulting in the formation of chemical bonds such as hydrogen bonds between the first fabric and the hot melt adhesive. When the second fabric has a second modified region, a similar effect occurs, making it possible to achieve even higher adhesive strength in the resulting adhesive.

[0046] [Equipment for manufacturing adhesives] An adhesive manufacturing apparatus according to one embodiment comprises, in this order, an adhesive layer forming unit that applies a hot melt adhesive to a first surface treatment area of ​​a first fabric having a first surface treatment area on its surface, along the transport direction of the first fabric, to form an adhesive layer, and a pressing unit that places a second fabric on the adhesive layer and presses the first fabric and the second fabric together via the adhesive layer.

[0047] The second fabric may have a second surface treatment area on its surface. In this case, the crimping portion may place the second surface treatment area of ​​the second fabric on the adhesive layer and crimp the first fabric and the second fabric together via the adhesive layer.

[0048] The adhesive manufacturing apparatus may further include a surface treatment area forming unit that forms a first surface treatment area by applying a surface treatment to the surface of a first fabric prior to the adhesive layer forming unit. In the adhesive manufacturing apparatus, one embodiment of the surface treatment area forming unit is a roughening area forming unit that forms a first roughened area by applying a roughening treatment to the surface of a first fabric. In the adhesive manufacturing apparatus, another embodiment of the surface treatment area forming unit is a modification area forming unit that forms a first modified area by applying a modification treatment to the surface of a first fabric.

[0049] Figure 1 is a schematic diagram showing one embodiment of an adhesive manufacturing apparatus. The adhesive manufacturing apparatus 100 shown in Figure 1 comprises, in this order: a roughening region forming unit 11a that forms a first roughening region on the surface 1a of the first fabric 1 along the transport direction A of the first fabric 1; an adhesive layer forming unit 12 that applies a hot melt adhesive to the first roughening region to form an adhesive layer 3; and a pressing unit 13 that places the second fabric 2 on the adhesive layer 3 (surface 3a of the adhesive layer 3) and presses the first fabric 1 and the second fabric 2 together via the adhesive layer 3. The adhesive manufacturing apparatus 100 may further include a first transport unit 14 for transporting the first fabric 1 in the transport direction A, and a second transport unit 15 for transporting the second fabric 2 in the transport direction B. With such an adhesive manufacturing apparatus 100, the above-described adhesive manufacturing method can be efficiently implemented.

[0050] The roughening region forming section 11a is for forming a first roughening region on the surface 1a of the first fabric 1. The roughening region forming section 11a may include, for example, abrasion treatment means such as sandpaper or a metal rod, or compression treatment means such as a needle punch. When using a first fabric that has already undergone roughening treatment (a first fabric having a first roughened treatment region on its surface) as the first fabric 1, the roughening region forming section 11a is not necessarily required. Therefore, the roughening region forming section 11a may be an element that can be attached and detached.

[0051] The adhesive layer forming section 12 is for forming an adhesive layer 3 by applying a hot melt adhesive to the first roughened region of the first fabric 1. Hot melt adhesives are usually heated and melted before being applied to a desired area. Therefore, the adhesive layer forming section 12 may have, for example, a melting means such as a heating mixer for melting the target hot melt adhesive, and an application means such as a dispenser, bar coater, die coater, roll coater, or spray for applying the molten target hot melt adhesive.

[0052] The crimping section 13 is for placing the second fabric 2 on the adhesive layer 3 (surface 3a of the adhesive layer 3) and crimping the first fabric 1 and the second fabric 2 together via the adhesive layer 3. When placing the second fabric 2 on the adhesive layer 3 (surface 3a of the adhesive layer 3), the second fabric 2 may be transported in a transport direction B different from the transport direction A of the first fabric 1. The crimping section 13 may include crimping means such as a roll machine or press machine for crimping the first fabric 1 and the second fabric 2 together via the adhesive layer 3, heating means such as a heater for heating the temperature when crimping the first fabric 1 and the second fabric 2 together, and temperature measuring means such as a thermocouple for measuring the temperature of the heating means when crimping the first fabric 1 and the second fabric 2 together.

[0053] The first transfer unit 14 is for transferring the first dough 1 in the transfer direction A, and may have a transfer mechanism such as a roller machine. The second transfer unit 15 is for transferring the second dough 2 in the transfer direction B, and like the first transfer unit 14, may have a transfer mechanism such as a roller machine.

[0054] In the adhesive manufacturing apparatus, another embodiment of the surface treatment region forming unit is a modified region forming unit that forms a first modified region by applying a modification treatment to the surface of the first fabric. Figure 2 is a schematic diagram showing another embodiment of the adhesive manufacturing apparatus. The adhesive manufacturing apparatus 200 shown in Figure 2 is the same as the adhesive manufacturing apparatus 100 shown in Figure 1, but with the roughening region forming unit 11a replaced by a modified region forming unit 11b. In the adhesive manufacturing apparatus 200 shown in Figure 2, elements other than the modified region forming unit 11b may be the same as the elements exemplified in the adhesive manufacturing apparatus 100 shown in Figure 1.

[0055] The modified region forming section 11b is for forming a first modified region on the surface 1a of the first fabric 1. The modified region forming section 11b may have various treatment means such as plasma treatment, corona treatment, flame treatment, ultraviolet (UV) treatment, etc. When using a first fabric that has already undergone a modification treatment (a first fabric having a first modified treatment region on its surface) as the first fabric 1, the modified region forming section 11b is not necessarily required. Therefore, the modified region forming section 11b may be an element that can be attached and detached.

[0056] The elements of the surface treatment area forming section (adhesive layer forming section or modification area forming section), the adhesive layer forming section, and the crimping section may be electrically connected, for example, by wire or wireless.

[0057] [Method of bonding fabrics] One embodiment of a fabric bonding method relates to a fabric bonding method for bonding a first fabric and a second fabric via a hot melt adhesive. The fabric bonding method comprises a first step of applying a hot melt adhesive to a first surface treatment area of ​​a first fabric having a first surface treatment area on its surface to form an adhesive layer, and a second step of placing the second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer. In the fabric bonding method, the second fabric may have a second surface treatment area on its surface. In this case, the second step may be a step of placing the second surface treatment area of ​​the second fabric on the adhesive layer. Such a fabric bonding method is provided that can exhibit high adhesive strength.

[0058] In a method for bonding fabrics, one embodiment of the first surface treatment region is a first roughened region formed by applying a roughening treatment to the surface of the first fabric. When the first surface treatment region has a first roughened region and the second fabric has a second surface treatment region, the second surface treatment region may be a second roughened region or a second modified region, and is preferably a second roughened region.

[0059] In a method for bonding fabrics, another aspect of the first surface treatment area is a modified area formed by applying a modification treatment to the surface of the first fabric. If the first surface treatment area has a modified area and the second fabric has a second surface treatment area, the second surface treatment area may be a second roughened area or a second modified area, and is preferably a second modified area.

[0060] The fabrics and hot-melt adhesives used in the fabric bonding method are the same as those used in the adhesive manufacturing method. The first and second steps in the fabric bonding method are the same as the first and second steps in the adhesive manufacturing method. Therefore, redundant explanations are omitted here. [Examples]

[0061] The present disclosure will be described below in detail based on examples, but the present disclosure is not limited to these examples.

[0062] [Examples 1 and 2] Formation of roughened regions (Preparing the dough) The following fabrics were prepared as the first and second fabrics. • Taffeta fabric a (Product name: 50D high-density taffeta (fluorine-treated), composition: 100% polyester, color: black, density: 0.76 g / cm³) 3 ) • Taffeta fabric b (Product name: 75D high-density taffeta durable water-repellent, composition: 100% polyester, color: black, density: 0.62 g / cm³) 3 )

[0063] The density of the taffeta fabric is measured in 5 x 7 cm sections. 2 The material was cut into sections, and its mass was measured using a precision balance. The density was then calculated from the obtained mass and the volume calculated from the size and thickness of the cut sections.

[0064] (Formation of roughened regions) Taffeta fabric a was used as the base material. The surface of taffeta fabric a was subjected to the roughening treatment shown in Table 2 along the transverse direction to obtain fabrics 1A to 1D having roughened areas (size of roughened area: 1 cm × 10 cm) on the surface. Two pieces of each fabric were prepared for the creation of adhesive bodies.

[0065] Taffeta fabric a was used as the base material. The surface of taffeta fabric a was subjected to the roughening treatment shown in Table 2 along the longitudinal direction to obtain fabrics 1E to 1G having roughened areas (size of roughened area: 1 cm × 10 cm) on the surface. Two pieces of each fabric were prepared for the creation of adhesive bodies.

[0066] Taffeta fabric b was used as the base material. The surface of taffeta fabric b was subjected to the roughening treatment shown in Table 2 along the transverse direction to obtain fabrics 2A to 2C having roughened areas (size of roughened area: 1 cm × 10 cm) on the surface. Two pieces of each fabric were prepared for the creation of adhesive bodies.

[0067] Tufted fabric b was used as the base fabric. On the surface of the tufted fabric b, the roughening treatment shown in Table 2 was carried out along the vertical direction to obtain fabrics 2D and 2E having roughened regions (size of the roughened region: 1 cm × 10 cm) on the surface. For the production of the adhesive body, two pieces of each fabric were prepared.

[0068] The roughening treatment using sandpaper was performed by manually rubbing twice with sandpaper of #2000, #800, #400, or #240. It was confirmed that the rougher the sandpaper, the greater the roughness of the fabric surface tended to be. Also, the roughening treatment using tweezers was performed by fixing the surface of the fabric and rubbing it with tweezers until the roughness became uniform visually.

[0069] (Measurement of surface shape) Regarding the surface shapes of tufted fabric a and fabrics 1A to 1G (roughened region parts), and tufted fabric b and fabrics 2A to 2E (roughened region parts), each fabric was measured from the surface using a laser microscope (OLS5000, manufactured by Olympus). The magnification of the objective lens was set to 20 times, and each parameter (ISO 25178) was obtained by performing noise removal and surface analysis on the obtained image (645 × 642 μm 2 ). The abbreviations of the obtained parameters are shown in Table 1. The measurement results of each parameter of the surface shapes of tufted fabric a and fabrics 1A to 1G (roughened region parts), and tufted fabric b and fabrics 2A to 2E (roughened region parts) are shown in Tables 2 and 3.

[0070]

Table 1

[0071]

Table 2

[0072]

Table 3

[0073] As shown in Table 2, roughened areas were confirmed to be formed in fabrics 1A to 1G compared to taffeta fabric a. Furthermore, as shown in Table 3, roughened areas were confirmed to be formed in fabrics 2A to 2E compared to taffeta fabric b. Additionally, as shown in Tables 2 and 3, it was found that applying the roughening treatment along the transverse direction (perpendicular to the yarn bundle with height in the fabric's thickness direction) tends to increase surface roughness.

[0074] Preparation of hot melt adhesive 80 parts by mass of amorphous polyester polyol having aromatic rings (hydroxyl group count: 2, number average molecular weight: 2000) mainly composed of dicarboxylic acids (adipic acid and isophthalic acid) and diols (ethylene glycol and neopentyl glycol), 4 parts by mass of amorphous polyether polyol having aromatic rings (manufactured by ADEKA Corporation, product name: BPX-11), and 16 parts by mass of amorphous polyester polyol without aromatic rings (hydroxyl group count: 2, number average molecular weight: 2000) mainly composed of dicarboxylic acid (adipic acid) and diols (neopentyl glycol and propylene glycol) were pre-treated by dehydration using a vacuum dryer. Diphenylmethane diisocyanate (manufactured by Tosoh Corporation, trade name: Myrionate MT, number of isocyanate groups: 2) was added to the reaction vessel so that the equivalent ratio of isocyanate groups of the polyisocyanate to the hydroxyl groups of the polyol ((NCO) equivalents / (OH) equivalents) was 1.8, and the mixture was mixed at 110°C for 1 hour until homogenized. Then, the mixture was degassed and stirred under reduced pressure at 110°C for another 1 hour to obtain a urethane prepolymer. In the following, the obtained urethane prepolymer was used directly as a hot melt adhesive. The viscosity of the hot melt adhesive at 120°C was 12 Pa·s.

[0075] (Example 1-1) Fabrication of adhesive An adhesive body was prepared using two pieces of taffeta fabric a, abraded with sandpaper (#2000), and a hot melt adhesive, following the procedure below. First, the prepared standard hot melt adhesive was melted at 110°C and applied to the roughened area of ​​one piece of fabric 1A using a dispenser to form a linear adhesive layer. Next, the roughened area of ​​the other piece of fabric 1A was placed on the formed linear adhesive layer, and the pieces were pressed together under the following pressing conditions to obtain a pressed body. Subsequently, the obtained pressed body was cured in a constant temperature bath at 23°C and 50%RH for one day to harden the adhesive layer, thereby obtaining the adhesive body of Example 1-1. <Crimping conditions> • Temperature (crimping temperature): 40°C • Load (compression load): 40N • Crimping time: 3 seconds

[0076] Measurement of adhesive strength The resulting adhesive samples were subjected to a T-type peel strength test using a tensile testing machine (Shimadzu Corporation, EZ-Test EZ-SX) at a measurement temperature of 25°C and a tensile speed of 100 mm / min to determine the adhesive strength (N). The width of the adhesive layer (mm) in the adhesive samples after measurement was measured using calipers, and the quotient between the adhesive strength and the adhesive layer width (adhesive strength / adhesive layer width) was calculated and defined as the adhesive force (N / 10mm). The results are shown in Table 4.

[0077] (Examples 1-2 to 1-7, Comparative Example 1-1, Examples 2-1 to 2-5, and Comparative Example 2-1) Except for replacing two pieces of fabric 1A, which were taffeta fabric a abrasion treatment with sandpaper (#2000), with the fabrics listed in Table 4, adhesive bodies for Examples 1-2 to 1-7, Comparative Example 1-1, Examples 2-1 to 2-5, and Comparative Example 2-1 were obtained in the same manner as in Example 1-1. The adhesive strength (N / 10mm) of the adhesive bodies for Examples 1-2 to 1-7, Comparative Example 1-1, Examples 2-1 to 2-5, and Comparative Example 2-1 was determined in the same manner as in Example 1-1. The results are shown in Table 4.

[0078] [Table 4]

[0079] As shown in Table 4, Examples 1-1 to 1-7, which used fabrics with roughened areas on the surface, showed higher adhesive strength than Comparative Example 1-1, which used fabrics without roughened areas on the surface. Also, as shown in Table 4, Examples 2-1 to 2-5, which used fabrics with roughened areas on the surface, showed higher adhesive strength than Comparative Example 2-1, which used fabrics without roughened areas on the surface. Furthermore, as shown in Table 4, it was found that the greater the surface roughness of the fabric (see Tables 2 and 3), the higher the adhesive strength tended to be. From these results, it was confirmed that the method for manufacturing the adhesive obtained by bonding fabrics together via a hot melt adhesive can produce high adhesive strength.

[0080] [Example 3] Formation of a modified region (Preparing the dough) The following fabrics were prepared as the first and second fabrics. • Taffeta fabric c (Product name: 50D high-density taffeta (fluorine-treated), composition: 100% polyester, color: black, density: 0.76 g / cm³) 3 )

[0081] The density of taffeta fabric c is measured over a 5 x 7 cm area. 2 The material was cut into sections, and its mass was measured using a precision balance. The density was then calculated from the obtained mass and the volume calculated from the size and thickness of the cut sections.

[0082] (Formation of modified regions) Taffeta fabric c was used as the base material. Plasma treatment was performed on the surface of the taffeta fabric using the following plasma apparatus under the conditions described in Table 5 to obtain fabrics 3A to 3G having a modified region (size of modified region: 10 cm × 10 cm) on the surface. Two of each fabric were prepared for the creation of adhesive bodies. <Plasma device> • Device: PC-300 (Samco Corporation) • Supply gas: O2 100 sccm The output and processing time were changed to the conditions listed in Table 5.

[0083] (Measurement of Contact Angle and Surface Free Energy) Regarding the surface states of the taffeta fabric and Fabrics 3A to 3G, the contact angles of water and iodoform were determined using a fully automatic contact angle meter (DMo-701, Kyowa Interface Science Co., Ltd.). Based on the obtained contact angles of water and iodoform, the surface free energy was calculated according to the Owens-Wendt theoretical formula. The results are shown in Table 5.

[0084] (X-ray Photoelectron Spectroscopy (XPS) Analysis) Regarding the surface states of the taffeta fabric and Fabrics 3A to 3G, XPS analysis was performed under the following equipment and conditions to analyze the constituent elements on the surface. The results are shown in Table 5. <XPS Analysis> · Equipment: PHI 5000 VersaProbeII (ULVAC-PHI, Inc.) · X-ray: Monochromatic AlKα ray (1486.6 eV) · Detection angle: 45° · Analysis area: 200 μmΦ

[0085]

Table 5

[0086] As shown in Table 5, it was confirmed that reformed regions were formed in Fabrics 3A to 3G compared with the taffeta fabric. Also, as shown in Table 5, it was found that Fabrics 3A to 3G had a decreased contact angle and improved wettability compared with the taffeta fabric by plasma treatment. Furthermore, as shown in Table 5, according to XPS analysis, it was found that the proportion of fluorine elements on the surface of Fabrics 3A to 3G was decreased compared with the taffeta fabric, and the water repellency effect (fluorine processing effect) was decreased by plasma treatment.

[0087] Preparation of Hot Melt Adhesive 80 parts by mass of amorphous polyester polyol having aromatic rings (hydroxyl group count: 2, number average molecular weight: 2000) mainly composed of dicarboxylic acids (adipic acid and isophthalic acid) and diols (ethylene glycol and neopentyl glycol), 4 parts by mass of amorphous polyether polyol having aromatic rings (manufactured by ADEKA Corporation, product name: BPX-11), and 16 parts by mass of amorphous polyester polyol without aromatic rings (hydroxyl group count: 2, number average molecular weight: 2000) mainly composed of dicarboxylic acid (adipic acid) and diols (neopentyl glycol and propylene glycol) were pre-treated by dehydration using a vacuum dryer. Diphenylmethane diisocyanate (manufactured by Tosoh Corporation, trade name: Myrionate MT, number of isocyanate groups: 2) was added to the reaction vessel so that the equivalent ratio of isocyanate groups of the polyisocyanate to the hydroxyl groups of the polyol ((NCO) equivalents / (OH) equivalents) was 1.8, and the mixture was mixed at 110°C for 1 hour until homogenized. Then, the mixture was degassed and stirred under reduced pressure at 110°C for another 1 hour to obtain a urethane prepolymer. In the following, the obtained urethane prepolymer was used directly as a hot melt adhesive. The viscosity of the hot melt adhesive at 120°C was 12 Pa·s.

[0088] (Example 3-1) Fabrication of adhesive An adhesive body was prepared using two modified fabrics 3A and a hot melt adhesive by the following procedure. First, the prepared standard hot melt adhesive was melted at 110°C and applied to the modified fabric of one of the fabrics 3A using a dispenser to form a linear adhesive layer. Next, the modified fabric of the other fabric 3A was placed on the formed linear adhesive layer and pressed together under the following pressing conditions to obtain a pressed body. Subsequently, the obtained pressed body was cured in a constant temperature bath at 23°C and 50%RH for one day to harden the adhesive layer and obtain the adhesive body of Example 3-1. <Crimping conditions> • Temperature (crimping temperature): 40°C • Load (compression load): 40N • Crimping time: 3 seconds

[0089] Measurement of adhesive strength The resulting adhesive samples were subjected to a T-type peel strength test using a tensile testing machine (Shimadzu Corporation, EZ-Test EZ-SX) at a measurement temperature of 25°C and a tensile speed of 100 mm / min to determine the adhesive strength (N). The width of the adhesive layer (mm) in the adhesive samples after measurement was measured using calipers, and the quotient between the adhesive strength and the adhesive layer width (adhesive strength / adhesive layer width) was calculated and defined as the adhesive force (N / 10mm). The results are shown in Table 6.

[0090] (Examples 3-2 to 3-7 and Comparative Example 3-1) Adhesives for Examples 3-2 to 3-7 and Comparative Example 3-1 were obtained in the same manner as in Example 3-1, except that fabric 3A, which has two modified regions, was replaced with the fabric described in Table 6. The adhesive strength (N / 10mm) of the adhesives for Examples 3-2 to 3-7 and Comparative Example 3-1 was determined in the same manner as in Example 3-1. The results are shown in Table 6.

[0091] [Table 6]

[0092] As shown in Table 6, Examples 3-1 to 3-7, which used fabrics having modified regions on their surface, exhibited higher adhesive strength than Comparative Example 3-1, which used fabrics without modified regions on their surface. These results confirm that the method for manufacturing adhesives according to this disclosure can produce high adhesive strength in adhesives obtained by bonding fabrics together via a hot-melt adhesive. [Industrial applicability]

[0093] This disclosure provides a method for manufacturing an adhesive that can exhibit high adhesive strength in an adhesive obtained by bonding fabrics together via a hot melt adhesive. Furthermore, this disclosure provides an apparatus for manufacturing such an adhesive that can efficiently carry out this manufacturing method. Moreover, this disclosure provides a method for bonding fabrics that can exhibit high adhesive strength. [Explanation of symbols]

[0094] 1...First fabric, 2...Second fabric, 3...Adhesive layer, 11a...Roughening region forming section, 11b...Modification region forming section, 12...Adhesive layer forming section, 13...Crimping section, 14...First transfer section, 15...Second transfer section, 100, 200...Adhesive manufacturing apparatus.

Claims

1. A first step of forming an adhesive layer by applying a moisture-curing hot-melt adhesive containing a urethane prepolymer onto the first surface-treated area of ​​a first fabric having a first surface-treated area on its surface, A second step involves placing a second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer to obtain an adhesive body. Equipped with, The first surface treatment region is a first modified region formed by applying plasma treatment to the surface of the first fabric under conditions where O2 is used as the supply gas. The water contact angle of the first modified region is 70° or less, and the surface free energy of the first modified region is 30 mJ / m ２ That's all. A method for manufacturing adhesives.

2. The second fabric has a second surface treatment area on its surface, The second step is to place the second surface treatment area of ​​the second fabric on the adhesive layer, The second surface treatment region is a second modified region formed by applying plasma treatment to the surface of the second fabric under conditions where O2 is used as the supply gas. The water contact angle of the second modified region is 70° or less, and the surface free energy of the second modified region is 30 mJ / m ２ That's all. A method for producing an adhesive according to claim 1.

3. Along the first direction of transport of the dough, An adhesive layer forming section is provided, in which an adhesive layer is formed by applying a moisture-curing hot-melt adhesive containing a urethane prepolymer to the first surface-treated area of ​​a first fabric having a first surface-treated area on its surface, A second fabric is placed on the adhesive layer, and a pressing section is provided to press the first fabric and the second fabric together via the adhesive layer. They are provided in this order, The first surface treatment region is a first modified region formed by applying plasma treatment to the surface of the first fabric under conditions where O2 is used as the supply gas. The water contact angle of the first modified region is 70° or less, and the surface free energy of the first modified region is 30 mJ / m ２ That's all. A manufacturing apparatus for adhesives.

4. The second fabric has a second surface treatment area on its surface, The crimping portion places the second surface treatment area of ​​the second fabric on the adhesive layer and crimps the first fabric and the second fabric together via the adhesive layer. The second surface treatment region is a second modified region formed by applying plasma treatment to the surface of the second fabric under conditions where O2 is used as the supply gas. The water contact angle of the second modified region is 70° or less, and the surface free energy of the second modified region is 30 mJ / m ２ That's all. The apparatus for manufacturing the adhesive according to claim 3.

5. Prior to the adhesive layer forming section, The device further comprises a surface treatment area forming unit that forms the first surface treatment area by applying a surface treatment to the surface of the first fabric, The surface treatment region forming unit is a modification region forming unit that forms the first modification region by applying plasma treatment to the surface of the first fabric under conditions where O2 is used as the supply gas. An apparatus for manufacturing an adhesive according to claim 3 or 4.

6. A method for bonding a first fabric and a second fabric via a moisture-curing hot-melt adhesive containing a urethane prepolymer, A first step of forming an adhesive layer by applying a moisture-curing hot-melt adhesive containing a urethane prepolymer onto the first surface-treated area of ​​a first fabric having a first surface-treated area on its surface, A second step involves placing a second fabric on the adhesive layer and bonding the first fabric and the second fabric via the adhesive layer, Equipped with, The first surface treatment region is a first modified region formed by applying plasma treatment to the surface of the first fabric under conditions where O2 is used as the supply gas. The water contact angle of the first modified region is 70° or less, and the surface free energy of the first modified region is 30 mJ / m ２ That's all. Method of bonding fabrics.

7. The second fabric has a second surface treatment area on its surface, The second step is to place the second surface treatment area of ​​the second fabric on the adhesive layer. The second surface treatment region is a second modified region formed by applying plasma treatment to the surface of the second fabric under conditions where O2 is used as the supply gas. The water contact angle of the second modified region is 70° or less, and the surface free energy of the second modified region is 30 mJ / m ２ That's all. The method for bonding fabrics according to claim 6.

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