Coated structure, adhesion structure, and manufacturing method of coated structure

Abstract

To provide a coated structure which can be formed by appropriately adjusting an intensity of elasticity of a coating part of a hot melt adhesive, and in which a side edge of the coating part has a smooth shape, and to provide an adhesion structure, and a manufacturing method of the coated structure.SOLUTION: A coated structure has a strip-like coating part A that is coated with a hot melt adhesive. In the strip-like coating part A, circular coating parts 1 are continuous in the longer direction, and neighboring circular coating parts 1 are formed by being mutually coupled by coupling coating parts 2. The neighboring circular coating parts 1 are mutually overlapped at least in part. One of the side edges extending in the longer direction of the strip-like coating part A is continuous with the coupling coating parts 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a coated structure, a bonded structure, and a method for manufacturing a coated structure. [Background technology]

[0002] A technique for applying adhesives such as hot melt adhesives in a predetermined pattern to substrates such as fabrics, clothing, sheets, etc. Hot melt adhesives are adhesives whose main component is a thermoplastic resin, which is solid at room temperature, and which are applied in a heated and molten state and then solidify by cooling.

[0003] A bonded structure having a predetermined adhesive pattern can be obtained by bonding an adherend to a coated structure in which an adhesive is applied to an object in a predetermined pattern and then heat-pressing the adherend. Patent Document 1 discloses a structure in which stretchable materials are bonded together via an adhesive pattern formed by applying an adhesive.

[0004] The adhesive pattern in Patent Document 1 is composed of adhesive parts where elastic materials are continuously bonded together by forming an adhesive into a predetermined shape, and non-adhesive parts where openings are formed by the adhesive parts in a plan view and the elastic materials are not bonded together by the adhesive, and the non-adhesive parts are not surrounded by adhesive parts. Figure 3(k) of Patent Document 1 discloses an adhesive pattern called a "spiral" that has a plurality of ring-shaped adhesive parts, and gaps (non-adhesive parts where openings are formed) are provided between adjacent ring-shaped adhesive parts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6153544 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, in products such as fabrics, clothing, and sheets, particularly products using stretchable materials, it is desirable to improve the stretchability (elongation rate and elongation modulus) of the hot melt adhesive application area, to have the application area stretchable in various directions, and to be able to form the application area by appropriately adjusting the strength of stretchability (elongation rate and elongation modulus) depending on the characteristics of the location where the application area is to be provided. It is also desirable for the edges of the application area to have a smooth shape so that the product has a seamless finish.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a coated structure, an adhesive structure, and a method for manufacturing a coated structure, which can be formed by appropriately adjusting the strength of the elasticity of the coated portion of the hot melt adhesive, and in which the side edges of the coated portion have a smooth shape. [Means for solving the problem]

[0008] In order to solve the above problems, the coating structure of the present disclosure comprises: An application structure having a band-shaped application portion to which a hot melt adhesive is applied, The band-shaped application portion is formed by connecting ring-shaped application portions in a longitudinal direction, and adjacent ring-shaped application portions are connected to each other by connecting application portions, The adjacent circular application portions at least partially overlap each other, One of the longitudinally extending side edges of the strip-shaped application portion is characterized in that the connected application portions are formed in a continuous manner.

[0009] In the above application structure, the application structure may have a seam, and the band-shaped application portion may be formed on the seam.

[0010] In order to solve the above problems, the bonded structure of the present disclosure is characterized in that the coated structure and the adherend are bonded via the strip-shaped coated portion.

[0011] In order to solve the above problems, the method for producing a coating structure according to the present disclosure includes: a step of discharging the hot melt adhesive from a discharge port provided so as to be movable at least in a horizontal direction, thereby tracing a coated portion of the adhesive on the object to be coated, thereby forming a band-shaped coated portion; The band-shaped application portion is formed by repeatedly drawing a unit application portion, which includes one ring-shaped application portion and one connected application portion extending from the ring-shaped application portion, in a predetermined direction on the object to be applied.

[0012] In the above-mentioned method for manufacturing the coating structure, it is preferable that the horizontal movement of the discharge outlet when depicting the unit coating portion is set so that the ring-shaped coating portion is depicted from the starting point of the depiction, the depiction position returns to the starting point, and then the connected coating portion is depicted from the starting point. [Effects of the Invention]

[0013] The hot melt adhesive application portion of the coating structure and adhesive structure of the present disclosure has excellent effects, such as the ability to adjust the strength of its elasticity as needed and the side edges having a smooth shape. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a plan view schematically illustrating the strip-shaped application part according to the present embodiment. [Figure 2] FIG. 2 is a plan view schematically illustrating a unit application part according to the present embodiment. [Figure 3] FIG. 2 is a plan view showing a schematic example of a band-shaped application section in which the pitch at which the unit application sections are provided is changed from that in FIG. 1. [Figure 4] FIG. 10 is a plan view showing a schematic example of a band-shaped application portion in which the ring-shaped application portion is elliptical. [Figure 5] FIG. 10 is a plan view showing a schematic example of a band-shaped application part formed by changing the diameter of the ring-shaped application part midway. [Figure 6] FIG. 10 is a plan view showing a schematic example of a band-shaped application part having a curved portion. [Figure 7] FIG. 2 is a perspective view schematically illustrating a coating device used to form a band-shaped coating portion according to the present embodiment. [Figure 8] FIG. 8 is an enlarged perspective view schematically illustrating a gun portion of the coating device shown in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the coated structure, bonded structure, and method for manufacturing the coated structure of the present disclosure will be described.

[0016] The coated structure according to this embodiment is manufactured by applying a hot melt adhesive onto an object to be coated, and has a band-shaped coated portion to which the hot melt adhesive is applied.

[0017] The bonded structure according to this embodiment can be produced by attaching an adherend to a coated structure having a strip-shaped coated portion and then heat-pressing them together. In other words, the bonded structure according to this embodiment is formed by bonding a coated structure and an adherend via the strip-shaped coated portion. In the bonded structure according to this embodiment, the portion bonded via the strip-shaped coated portion has rubber elasticity, i.e., is stretchable.

[0018] FIG. 1 is a plan view schematically illustrating a band-shaped application section A according to this embodiment, and FIG. 2 is a plan view schematically illustrating a unit application section a according to this embodiment. Unit application section a is composed of one ring-shaped application section 1 and one connected application section 2 extending from that ring-shaped application section 1. The connected application sections 2 are formed to a length such that adjacent ring-shaped application sections 1 overlap each other. By having the shape of band-shaped application section A shown in FIG. 1, band-shaped application section A can expand and contract in any direction 360 degrees within the surface of the object on which it is provided. Note that d1 in FIG. 1 is the distance between adjacent ring-shaped application sections 1, or in other words, the pitch at which unit application sections a are provided. d2 in FIG. 1 is the diameter of ring-shaped application section 1 and the width of band-shaped application section A, and the direction perpendicular to this width direction is the longitudinal direction of band-shaped application section A.

[0019] The band-shaped application area A shown in FIG. 1 is formed by repeatedly and continuously drawing unit application areas a shown in FIG. 2 in a predetermined direction on the object to be applied (the direction indicated by the arrow in FIG. 1). Therefore, in the band-shaped application area A, adjacent ring-shaped application areas 1 are connected to each other by connected application areas 2. In other words, one of the longitudinally extending side edges of the band-shaped application area A (the upper side edge in FIG. 1) is made up of a series of connected application areas 2. As a result, this side edge of the band-shaped application area A has a smooth shape with few irregularities, thereby achieving a seamless finish.

[0020] FIG. 3 is a plan view schematically illustrating a band-shaped application section in which the pitch at which unit application sections are arranged (the distance d1 between adjacent ring-shaped application sections) is changed from that shown in FIG. 1 . While the ring-shaped application section 1 in FIG. 1 overlaps with the ring-shaped application section 1 two sections away, the ring-shaped application section 1 in FIG. 3 overlaps only with the adjacent ring-shaped application section 1, making it possible to change the pitch at which unit application sections a are arranged. By lengthening or shortening the pitch d1 at which unit application sections a are arranged, the application density of the hot melt adhesive can be adjusted, and therefore the stretchability (elongation rate and elongation modulus) of the band-shaped application section A can be adjusted. In addition, because the band-shaped application section A has side edges formed by a series of connected application sections 2 as described above, the side edges can maintain a smooth shape even if the pitch d1 at which unit application sections a are arranged is changed.

[0021] 1 and 3, adjacent ring-shaped application parts 1 at least partially overlap each other, leaving no gaps between adjacent ring-shaped application parts 1, preventing the intrusion of water and dust, and therefore the strip-shaped application part A has excellent waterproof and dustproof properties. Waterproof and dustproof properties can be further ensured by shortening the pitch d1 at which the unit application parts a are arranged.

[0022] When the object to which the hot melt adhesive is to be applied is a sewn product, a band-shaped application area A can be formed on the seam of the sewn product. By forming a band-shaped application area A on the seam, it is possible to prevent stuffing such as cotton or wool from coming out of the seam. It is also possible to make the seam waterproof.

[0023] The width d2 of the band-shaped application portion A shown in Figure 1 can be set in a range of 3 mm to 30 mm. The line width of the ring-shaped application portion 1 and the continuous application portion 2 can be set in a range of 0.5 mm to 1.0 mm.

[0024] The shape of the ring-shaped application part 1 is not limited to the circle shown in Fig. 1 etc., but may also be elliptical. That is, as shown in Fig. 4, the strip-shaped application part A may be configured with a series of elliptical ring-shaped application parts 1. Furthermore, it is not required to be strictly circular or elliptical, and it may be approximately circular or approximately elliptical. Here, approximately circular means not only circular but also shapes similar to a circle, and approximately elliptical means not only elliptical but also shapes similar to an ellipse.

[0025] When forming the band-shaped application area A, the diameter (minor or major axis in the case of an ellipse) of the ring-shaped application area 1 of each application area a may be changed during the process of repeatedly and continuously drawing unit application areas a in a predetermined direction on the object to be applied, as shown in Figure 5. By changing the size of the ring-shaped application area 1 in this way, the stretchability of the application area can be controlled to the desired strength.

[0026] The shape of the belt-shaped application portion A is not limited to the linear shape shown in FIG. 1 etc., but may also be curved as shown in FIG. 6. That is, the connected application portions 2 may be linear or curved. Furthermore, in the example of FIG. 6, if the unit application portions a are depicted progressing from left to right in FIG. 6, the connected application portions 2 are initially depicted on the left side of the direction of progression, but are changed midway to depict the connected application portions 2 on the right side of the direction of progression. In this way, when forming the belt-shaped application portion A, the position at which the connected application portions 2 are depicted may be changed while the unit application portions a are repeatedly and continuously depicted in a predetermined direction on the object to be applied.

[0027] Fig. 7 is a perspective view showing a typical application device used to form a band-shaped application portion according to this embodiment, and Fig. 8 is a perspective view showing an enlarged schematic view of a gun portion of the application device shown in Fig. 7. The application device 10 shown in Fig. 7 includes a gun 11 equipped with a discharge port 12 for discharging hot melt adhesive, and a melt tank 13 for supplying molten hot melt adhesive to the gun 11. The melt tank 13 is structured so that an inner cylinder 14 can be housed therein.

[0028] The hot melt adhesive can be stored in the melt tank 13 by pouring the hot melt adhesive into the inner cylinder 14, closing the lid 14a of the inner cylinder 14, inserting the inner cylinder 14 into the melt tank 13, and then closing the lid 13a of the melt tank 13. A urethane-based reactive hot melt adhesive (PUR) can also be used as the hot melt adhesive.

[0029] A temperature control device 15 is connected to the melting tank 13, which controls the temperature inside the melting tank 13, and the hot melt adhesive can be melted by raising the temperature inside the melting tank 13. The melting tank 13 is designed to be able to supply air K1 into the inner tube 14 from its top (lid 13a in Figure 7), and the supply of air K1 pressurizes the hot melt adhesive inside the inner tube 14, and the molten hot melt adhesive is supplied to the gun 11. The gun 11 is designed to be able to supply air K2 into its interior, and the supply of air K2 operates the gun 11, causing the molten hot melt adhesive to be discharged from the discharge port 12. By adjusting the degree of pressure applied by air K2, the amount of hot melt adhesive discharged (the amount applied to the object) can be changed, and therefore the line width of the hot melt adhesive applied can be controlled.

[0030] The coating device 10 is attached to a robot (not shown in FIG. 7). By operating the robot, the coating device 10 can be moved horizontally (in the X and Y directions shown in FIG. 7). In other words, the discharge port 12 of the coating device 10 is provided so that it can move at least horizontally. In this embodiment, a Cartesian robot "JC-3 series" manufactured by Janome Corporation is used as the robot, and the movement of this robot is numerically controlled to perform regular and reproducible coating. By numerically controlling the movement of the robot in this way, coating can be performed at the exact coating position without disrupting the coating pattern. Another advantage is that the phenomenon of droplets scattering in a bulbous shape does not occur at the start of coating.

[0031] In this embodiment, the distance d3 between the discharge port 12 and the object to be coated shown in Figure 8 can also be controlled; in other words, the discharge port 12 is provided so as to be movable in the vertical direction as well. The distance d3 can be 0.3 mm or more and 1.0 mm or less, and preferably 0.5 mm or more and 1.0 mm or less. In this way, it is desirable to provide a clearance between the discharge port 12 and the object to be coated.

[0032] As shown in Figure 8, the molten hot melt adhesive is discharged vertically from the discharge port 12, and therefore, while the object to be coated is fixed, unit coated portion a can be formed by moving the discharge port 12 so as to correspond to the depiction of unit coated portion a shown in Figure 2. Furthermore, by repeating the formation of unit coated portions a, a band-shaped coated portion A can be formed. In other words, by numerically controlling the movement operation of the robot so that the discharge port 12 moves in this manner, coated structures and bonded structures having band-shaped coated portion A can be manufactured.

[0033] Next, the process of forming unit application part a using application device 10 shown in Fig. 7 will be described with reference to Fig. 2. The movement of discharge port 12 when drawing unit application part a is set so that ring-shaped application part 1 is drawn from drawing start point P1 shown in Fig. 2, and after the drawing position returns to start point P1, connected application part 2 is drawn from start point P1.

[0034] More specifically, the process for forming unit application portions a according to this embodiment comprises a ring-shaped application portion drawing step for forming ring-shaped application portion 1 and a connected application portion drawing step for forming connected application portions 2. First, the ring-shaped application portion drawing step is a step in which ring-shaped application portion 1 is drawn in the direction of arrow S1 from drawing start point P1 shown in FIG. 2 , and the drawing position returns to start point P1. Next, the connected application portion drawing step is a step in which, after the drawing position returns to start point P1 in the ring-shaped application portion drawing step, connected application portions 2 are drawn from start point P1 in the direction of arrow S2 (the tangent direction to the circle of ring-shaped application portion 1), and the drawing position reaches end point P2. By performing the unit application portion a forming step again from this end point P2, adjacent unit application portions a can be formed, and by repeating this process, a strip-shaped application portion A can be formed.

[0035] It should be noted that the embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-described embodiments, but should be defined based on the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0036] 1 Ring-shaped application area 2 Connected application section 10 Coating equipment 11 Gun 12 outlet (nozzle) 13 Melting Tank 13a Lid 14 Inner tube (aluminum can) 14a Lid 15 Temperature control device A. Band-shaped application area a Unit application part d1 Pitch (distance between adjacent circular application areas) d2 Width of the strip application area d3 Distance between the nozzle of the coating device and the object to be coated K1 Air K2 Air P1 Starting point of unit application area P2 End point of unit application area S1 Drawing direction in the circular application part drawing process S2 Drawing direction in the connecting coating part drawing process X Horizontal direction (longitudinal direction of the strip-shaped application part) Y Horizontal direction (width direction of the strip-shaped application part)

Claims

1. An application structure having a band-shaped application portion to which a hot melt adhesive is applied, The band-shaped application portion is formed by connecting ring-shaped application portions in a longitudinal direction, and adjacent ring-shaped application portions are connected to each other by connecting application portions, The adjacent circular application portions at least partially overlap each other, A coating structure characterized in that one of the longitudinally extending side edges of the band-shaped coating portion is formed by a series of the connected coating portions.

2. The coating structure according to claim 1, the application structure has a seam; The application structure is characterized in that the band-shaped application portion is formed on the seam.

3. 3. A bonded structure, characterized in that the coated structure according to claim 1 or 2 and an adherend are bonded via the band-shaped coated portion.

4. A method for producing the coated structure according to claim 1 or 2, comprising: a step of discharging the hot melt adhesive from a discharge port provided so as to be movable at least in a horizontal direction, thereby tracing a coated portion of the adhesive on the object to be coated, thereby forming a band-shaped coated portion; A method for manufacturing a coating structure, characterized in that the band-shaped coating portion is formed by repeatedly drawing unit coating portions, each unit coating portion including one ring-shaped coating portion and one connected coating portion extending from the ring-shaped coating portion, in a predetermined direction on the object to be coated.

5. A method for producing the coated structure according to claim 4, A method for manufacturing a coating structure, characterized in that the horizontal movement of the discharge outlet when drawing the unit coating portion is set so that the ring-shaped coating portion is drawn from the starting point of the drawing, and after the drawing position returns to the starting point, the connected coating portion is drawn from the starting point.

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