Coated structure, bonded structure, and method for manufacturing coated structure

Abstract

To provide a coating structure that includes a coating part of a hot-melt adhesive including waterproofness and dust resistance.SOLUTION: A coating structure includes a strip-like coating part to which a hot-melt adhesive is applied. The strip-like coating part is formed while a circular coating part is continued thereto. Since adjacent circular coating parts overlay on each other, both side edges in a longitudinal direction of the strip-like coating part are formed while a peripheral edge of the circular coating part is continued thereto.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] Techniques for applying adhesives such as hot melt adhesives in a predetermined pattern to substrates such as fabrics, clothing, and sheets are becoming widespread. Hot melt adhesives are adhesives whose main component is a thermoplastic resin and which are solid at room temperature. They are applied in a heated, molten state and then solidify by cooling. For example, Patent Document 1 discloses a spiral spray coating method and spiral spray coating device that forms a spiral spray coating pattern by applying a swirling flow of pressurized air to a bead of hot melt adhesive discharged from the center of the nozzle tip.

[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 2 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 2 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 2 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. 3837600 [Patent Document 2] Patent No. 6153544 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, in products such as fabrics, clothing, sheets, etc., it is desirable to improve the waterproofness and dustproofness of the adhesive-applied portion. In addition, in sewn products such as clothing, it is desirable to prevent stuffing such as cotton or wool from leaking out through the seams, and in the case of waterproof wear, it is also desirable to make the seams waterproof.

[0007] The present disclosure has been made in consideration of the above-mentioned circumstances regarding hot melt adhesive coating parts, and aims to provide a coated structure and a bonded structure having a coating part that is excellent in waterproofness and dustproofness.

[0008] Another object of the present invention is to provide a coated structure and a bonded structure having an application part that can prevent stuffing such as cotton or wool from coming out when the structure is a sewn product. [Means for solving the problem]

[0009] In order to solve the above problems, the coating structure of the present disclosure is a coating structure having a band-shaped coating portion to which a hot melt adhesive is applied, and the band-shaped coating portion is formed by a series of ring-shaped coating portions, and adjacent ring-shaped coating portions overlap each other, so that both longitudinal side edges of the band-shaped coating portion are formed by a series of peripheral edges of the ring-shaped coating portions.

[0010] In the above application structure, the application structure may have a seam, and the band-shaped application portion may be formed on the seam.

[0011] In the above coating structure, the width of the band-shaped coating portion is preferably 5 mm or more and 7 mm or less.

[0012] In order to solve the above problems, the bonded structure of the present disclosure is characterized in that the above coated structure and an adherend are bonded via the strip-shaped coated portion.

[0013] In order to solve the above problems, the method for manufacturing a coated structure disclosed herein is characterized by including a step of spraying gas onto hot melt adhesive dispensed in a thread-like form, causing the adhesive to descend in a spiral toward the object to be coated, and moving the object to be coated in a predetermined transport direction, thereby applying the adhesive onto the object to form a strip-shaped coated portion. [Effects of the Invention]

[0014] The adhesive application portion of the coated structure and bonded structure of the present disclosure has excellent waterproof and dustproof properties, and by being placed on the seams, it can prevent the stuffing from leaking out, thereby providing excellent effects. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a plan view schematically illustrating the strip-shaped application part according to the present embodiment. [Figure 2] FIG. 10 is a plan view schematically illustrating the strip-shaped application part according to the present embodiment formed on a seam. [Figure 3] FIG. 2 is a cross-sectional view of a nozzle tip used to form a band-shaped application portion according to the present embodiment. [Figure 4] FIG. 4 is a bottom view of the nozzle tip of FIG. 3. [Figure 5] 1 is a cross-sectional view schematically showing one step of a method for manufacturing a coated structure according to the present embodiment. [Figure 6] FIG. 2 is a cross-sectional view showing a gun unit portion of the spiral spray coating device. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the coated structure, bonded structure, and method for manufacturing the coated structure of the present disclosure will be described.

[0017] The coating structure according to this embodiment has a strip-shaped coating portion A coated with a hot melt adhesive. Fig. 1 is a plan view showing a schematic example of the strip-shaped coating portion A. In Fig. 1, w indicates the width of the strip-shaped coating portion A, and the direction perpendicular to this width direction is the longitudinal direction of the strip-shaped coating portion A.

[0018] The bonded structure according to this embodiment can be produced by attaching an adherend to a coated structure having a strip-shaped coated portion A and then heat-pressing the adherend together. In other words, the bonded structure according to this embodiment is produced by bonding the coated structure and the adherend together via the strip-shaped coated portion A.

[0019] As shown in Figure 1, the strip-shaped application portion A is formed by connecting multiple ring-shaped application portions a, with adjacent ring-shaped application portions a overlapping each other. Because adjacent ring-shaped application portions a overlap each other, both longitudinal side edges of the strip-shaped application portion A are formed by the peripheries of multiple ring-shaped application portions a connected together. Because there are no gaps between adjacent ring-shaped application portions a, water and dust cannot enter through the gaps, resulting in excellent waterproof and dustproof properties. Furthermore, while gaps between adjacent ring-shaped application portions a result in areas where the adhesive application width is narrow, the strip-shaped application portion A has a nearly constant application width, resulting in excellent adhesive strength.

[0020] In this embodiment, as shown in FIG. 1, both longitudinal side edges of the strip-shaped application part A are formed in a substantially straight line. In other words, adjacent ring-shaped application parts a overlap each other so that the peripheral edges of adjacent ring-shaped application parts a are in close contact and communicate with each other on both longitudinal side edges of the strip-shaped application part A. This large overlap between the ring-shaped application parts a provides the strip-shaped application part A with excellent adhesive strength. Furthermore, since both longitudinal side edges of the strip-shaped application part A have a smooth shape with few irregularities, a seamless finish can be achieved, achieving a beautiful style. Note that, although the strip-shaped application part A is formed in a straight line in FIGS. 1 and 2, the shape of the strip-shaped application part A is not limited to this and can be formed in a shape that bends at any angle or in a curved shape.

[0021] 2 is a plan view showing a schematic example of a band-shaped application portion A according to this embodiment formed on a seam T when the object to be applied is a sewn product. Since the band-shaped application portion A has a constant application width, forming the band-shaped application portion A on the seam T as shown in FIG. 2 can prevent stuffing such as cotton or wool from coming out of the seam T. It can also make the seam T waterproof.

[0022] 1 and 2 is 5 mm, in other words, the diameter of the ring-shaped application portion a is 5 mm. The width w of the band-shaped application portion A can be changed to a value other than 5 mm, and the setting range for the width w can be, for example, 4 mm to 8 mm, but is preferably 5 mm to 7 mm.

[0023] The coating structure having the band-shaped coating portion A shown in Figures 1 and 2 can be manufactured using the spiral spray coating device disclosed in Patent Document 1. However, with the nozzle tip disclosed in Figure 2 etc. of Patent Document 1, the diameter of the ring-shaped coating portion formed on the object to be coated is about 15 mm to 20 mm, so in this embodiment, a different nozzle tip is used.

[0024] FIG. 3 is a cross-sectional view of the nozzle tip 1 used to form the band-shaped application portion A according to this embodiment, and FIG. 4 is a bottom view of the nozzle tip 1 of FIG. 3. The nozzle tip 1 is attached to a spiral spray application device when in use. FIG. 6 is a cross-sectional view showing the gun unit portion of the spiral spray application device, illustrating the manner in which the nozzle tip 1 is attached. Of the components that make up the gun unit, FIG. 6 shows the nozzle tip 1, nozzle body 2, and gun base 3.

[0025] As shown in Figures 3 and 4, the bottom surface 1a of the nozzle tip 1 is provided with an adhesive hole 11 for discharging a thread-like hot melt adhesive h and a pressurized air hole 12 for spraying air K. As shown in Figure 3, a conical protrusion 13 protruding in a cone shape is formed in the center of the bottom surface 1a of the nozzle tip 1, and the adhesive hole 11 opens at the tip of the conical protrusion 13. Furthermore, as shown in Figure 4, when the nozzle tip 1 is viewed from the bottom side, the adhesive hole 11 is located at the center of the bottom surface 1a, and multiple pressurized air holes 12 are formed on a circle centered on the adhesive hole 11.

[0026] As shown in Figure 3, a boss portion 5 is provided on the top surface 1b of the nozzle tip 1 so as to protrude and cover the periphery of the adhesive hole 11. A screw 7 formed on the boss portion 5 is screwed into the threaded portion 8 shown in Figure 6, thereby attaching the nozzle tip 1 to the nozzle body 2. A recess 6 provided on the top surface 1b of the nozzle tip 1 forms a pressurized air chamber 9 when the nozzle tip 1 is attached to the nozzle body 2 as shown in Figure 6.

[0027] FIG. 5 is a cross-sectional view schematically illustrating a step in the manufacturing method of the application structure according to the present embodiment. As shown in FIG. 5, air K is sprayed as a swirling flow from the multiple pressurized air holes 12, causing the thread-like (fibrous) hot melt adhesive h discharged from the adhesive hole 11 to descend in a spiral. To spray air K as a swirling flow, the pressurized air holes 12 are formed to have an inclination angle and a rotation angle with respect to the axis of the adhesive hole 11. Here, the inclination angle is the angle (α shown in FIG. 3 ) formed by a line passing through the opening 12a (the opening on the bottom surface 1a side) and the opening 12b (the opening on the top surface 1b side) of the pressurized air hole 12 and the axis of the adhesive hole 11 when projected onto a vertical plane. The rotation angle is the angle formed by a line passing through the axis of the adhesive hole 11 and the opening 12a and a line passing through the axis of the adhesive hole 11 and the opening 12b when projected onto a horizontal plane.

[0028] While the nozzle tip disclosed in Patent Document 1 is further provided with a second pressurized air hole, the nozzle tip 1 according to this embodiment does not have a second pressurized air hole and has only four pressurized air holes 12. In this embodiment, the diameter of the pressurized air holes 12 is reduced to approximately 0.4 mm, so that the air K sprayed from the pressurized air holes 12 is fine air. By using a nozzle tip 1 having these characteristics, it is possible to form a ring-shaped application area a with a small diameter (approximately 5 mm to 7 mm) on the object 100 to be applied. It is also possible to form a ring-shaped application area a with high circularity.

[0029] This nozzle tip 1 is attached to a spiral spray coating device as shown in Fig. 6, and thread-like hot melt adhesive h is caused to descend in a spiral shape toward the object 100 as shown in Fig. 5, while the object 100 is moved in a predetermined conveying direction, thereby forming a band-like coated area A consisting of a series of ring-shaped coated areas a on the object 100. The moving speed of the object 100 can be set to 15 m / min to 20 m / min, making it suitable for coating at low speeds.

[0030] In this manner, it is possible to manufacture a coated structure having a belt-shaped coated portion A. According to this manufacturing method (coating method), the width (pattern width) of the belt-shaped coated portion A can be kept constant even when changing from linear coating to curved coating.

[0031] Furthermore, according to this manufacturing method, the hot melt adhesive can be applied to the object 100, such as fabric, at a low temperature of about 120°C, so that the application can be performed without causing thermal damage to the object 100. Furthermore, this manufacturing method has the following excellent advantages: (1) the hot melt adhesive can be applied with an extremely small amount of compressed air consumption, (2) it can be applied to adhesive hot melt adhesives, and (3) it can be applied to urethane-based reactive hot melt adhesives (PUR).

[0032] The bonded structure obtained by bonding the coated structure having the belt-shaped coated portion A thus produced to the adherend has excellent adhesive strength and also excellent flexibility of the bonded portion. In addition, it has the following advantages: (1) adhesive effect can be obtained with a small amount of adhesive applied (about 1 g / m), (2) bonding can be achieved quickly, and (3) the production process can be simplified, resulting in cost advantages.

[0033] 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]

[0034] 100 Object to be coated A. Band-shaped application area a. Circular application area h Hot melt adhesive dispensed in a thread shape T-seam w Width of the strip-shaped application area

Claims

1. A coating structure having a coating target and a strip-shaped coating portion on which a hot melt adhesive is applied, The band-shaped application portion is formed by connecting a plurality of ring-shaped application portions, Adjacent ring-shaped application portions overlap each other over the entire area of ​​the band-shaped application portions, the band-shaped application portion has both side edges along its longitudinal direction, and the both side edges are formed by connecting the peripheral edges of the plurality of ring-shaped application portions, The object to be coated has a seam, the band-shaped application portion is formed on the seam, A coating structure characterized in that it has stuffing such as cotton, wool, etc. inside at least the position where the seam is located.

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

3. A method for producing the coated structure according to claim 1, A method for manufacturing a coated structure, comprising the steps of spraying gas onto the hot melt adhesive discharged in a thread-like form, causing the hot melt adhesive to descend in a spiral toward the object to be coated, and moving the object to be coated in a predetermined transport direction, thereby applying the hot melt adhesive onto the object to form the band-like coated portion.

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