Frame

Abstract

The present invention provides a frame that allows the mesh to be fixed to the frame using hot melt adhesive without the use of harmful substances, while reducing the likelihood of the hot melt adhesive peeling off the frame. [Solution] The upper plate portion 11 of the frame member 2 has an adhesive surface 2a to which hot melt adhesive is applied and mesh is attached. Multiple holes 16 are formed in the upper plate portion 11, penetrating from the adhesive surface 2a to the surface on the opposite side of the adhesive surface 2a.

Description

Technical Field

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[0001] The present invention relates to a frame for fixing a yarn used in silk screen printing.

Background Art

[0002] An adhesive is used to fix the yarn used in silk screen printing to the frame. This adhesive contains an organic solvent that has an adverse effect on the human body and the environment.

[0003] Therefore, Patent Document 1 discloses a technique for fixing a yarn to a frame using hot melt. Hot melt is a substance that is almost harmless to the human body and is also used in the food industry.

[0004] However, when fixing the yarn to the frame using hot melt, especially when the frame is made of aluminum, the hot melt is likely to peel off from the frame.

[0005] In contrast, by previously applying a primer to the frame and welding the yarn with hot melt thereon, it is possible to reduce the peeling of the hot melt from the frame.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, since primers generally contain harmful organic solvents, the merit of using harmless hot melt is impaired. Therefore, there has been a demand for a technique that can reduce the peeling of the hot melt from the frame while fixing the yarn to the frame with hot melt without using harmful substances.

[0008] The present invention has been made in view of the above, and aims to provide a frame that can fix the mesh to the frame using hot melt without using harmful substances, while reducing the likelihood of the hot melt peeling off the frame. [Means for solving the problem]

[0009] To achieve the above objective, the frame of the present invention comprises a plate portion having an adhesive surface to which hot melt adhesive is applied and mesh is attached, and the plate portion is characterized in that a plurality of holes are formed therein that penetrate from the adhesive surface to the surface on the opposite side of the adhesive surface. [Effects of the Invention]

[0010] According to the present invention, the mesh can be fixed to the frame using hot melt adhesive without using harmful substances, while reducing the likelihood of the hot melt adhesive peeling off the frame. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing the schematic configuration of the frame according to the embodiment. [Figure 2] Figure 1 is a partially enlarged cross-sectional perspective view of the frame shown. [Figure 3] This is a perspective view showing the frame with hot melt adhesive applied. [Figure 4] This diagram shows the process of fusing mesh onto a frame. [Figure 5] This is a cross-sectional view showing the state in which the mesh has been fused to the frame. [Figure 6] This is an enlarged cross-sectional view showing the state in which the mesh has been fused to the frame. [Figure 7] This diagram shows the hot melt adhesive detached from the frame. [Figure 8] This diagram shows how fragments of hot melt are discharged from the frame. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or equivalent parts and components throughout the drawings are denoted by the same or equivalent reference numerals.

[0013] The embodiments shown below exemplify devices and the like for embodying the technical idea of this invention. The technical idea of this invention does not specify the materials, shapes, structures, arrangements, etc. of each component part as follows. The technical idea of this invention can be variously modified within the scope of the claims.

[0014] FIG. 1 is a perspective view showing a schematic configuration of a frame body according to an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional perspective view of the frame body shown in FIG. 1. In the following description, the up, down, left, right, front, and rear directions indicated by the arrows in FIG. 1 are defined as the up, down, left, right, front, and rear directions of the frame body.

[0015] As shown in FIG. 1, the frame body 1 according to the present embodiment is formed in a rectangular frame shape by two frame members 2 extending in the front-rear direction and two frame members 2 extending in the left-right direction.

[0016] The frame member 2 is made of an aluminum square pipe. Each frame member 2 is welded to the other two frame members 2.

[0017] Each frame member 2 has an attachment surface 2a to which hot melt 21 (see FIG. 3 etc.) is applied and yarn 22 (see FIG. 4 etc.) is attached.

[0018] The yarn 22 is a mesh made of a metal such as stainless steel or a resin such as polyester. In the present embodiment, the yarn 22 is also assumed to include a screen master in which a thermoplastic resin film is attached to the mesh.

[0019] As shown in FIG. 2, the frame member 2 has flat upper plate portions (corresponding to plate portions) 11 and lower plate portions 12 that face each other in the up-down direction. The frame member 2 also has two flat side plate portions 13 that face each other in the up-down direction and in a direction orthogonal to the direction in which the frame member 2 extends.

[0020] The upper plane of the upper plate portion 11 is the above-mentioned pasting surface 2a. A plurality of holes 16 penetrating from the pasting surface 2a to the lower surface, which is the surface opposite to the pasting surface 2a, are formed in the upper plate portion 11. The plurality of holes 16 are arranged along the direction in which the frame member 2 extends.

[0021] The shape of the hole 16 is not particularly limited, but if it is circular, the hot melt 21 can easily pass through, and the drilling process is also easy. In the present embodiment, the hole 16 is formed in a circular shape.

[0022] The size of the hole 16 is not particularly limited, but it may be set according to the viscosity of the hot melt 21. Specifically, when the viscosity of the hot melt 21 is relatively low, the hole 16 may be made relatively small, and when the viscosity of the hot melt 21 is relatively high, the hole 16 may be made relatively large.

[0023] Thereby, while suppressing the amount of the hot melt 21 passing through the hole 16 from becoming excessive and reducing the waste of the hot melt 21, the hot melt 21 can easily pass through the hole 16 to form the anchor portion 21a described later.

[0024] For example, when using a hot melt 21 with a relatively low viscosity of 3000 - 4000 cps, the size of the hole 16 can be about φ8 mm.

[0025] The number of the holes 16 is not particularly limited, but the more the holes 16 are, the higher the fixing force of the hot melt 21 can be. However, when replacing the hot melt 21, it is necessary to cut it off from the frame body 1 with a cutter or the like, and in this case, the more the holes 16 are, the more laborious it is. Therefore, the number of the holes 16 may be set to a number that can increase the fixing force of the hot melt 21 without making the labor for separating the hot melt 21 from the frame body 1 too large.

[0026] The pitch of the holes 16 may be set to a size such that the yarn 22 does not shift when tension is applied to the yarn 22. For example, the pitch of the holes 16 can be about 50 mm.

[0027] A window portion 17 is formed in the frame 1. The window portion 17 is for discharging fragments 21b of the hot melt 21, which will be described later, from inside the frame 1.

[0028] The number and shape of the window portions 17 are not particularly limited, but in this embodiment, one rectangular window portion 17 is formed.

[0029] In this embodiment, the window portion 17 is formed at the lower part of the right end of the outer (front) side plate portion 13 of the front frame member 2.

[0030] The lower edge of the window section 17 is aligned with the upper surface of the lower plate section 12. The right vertical edge of the window section 17 is aligned with the inner wall surface of the outer (right) side plate section 13 of the right frame member 2. This prevents the fragments 21b of the hot melt 21 from getting caught on the edge of the window section 17 on the lower and right sides.

[0031] The size of the window section 17 is set to the minimum necessary size to discharge the fragments 21b of the hot melt 21 in order to minimize its impact on the torsional rigidity of the frame 1. For example, if the size of the fragments 21b of the hot melt 21 is approximately 10 mm, the window section 17 can be 1.5 times larger, or 15 mm square.

[0032] Next, we will explain how to fix the gauze 22 to the frame 1.

[0033] First, as shown in Figure 3, hot melt 21 is applied to the adhesive surface 2a of each frame member 2 of the frame body 1. For example, a glue gun can be used to apply the hot melt 21. In this case, for example, by using a wide nozzle with a width of 12 mm, the hot melt 21 can be applied thinly and widely to the adhesive surface 2a.

[0034] Next, the frame 1 is placed in a mesh stretching device (not shown), tension is applied to the mesh 22, and the mesh 22 is brought into contact with the hot melt 21 applied to the frame 1.

[0035] Next, as shown in Figure 4, the heating element 27 of the hot iron 26 is pressed against the mesh 22 on the hot melt 21, melting and crushing the hot melt 21 while making the mesh 22 adhere closely to the hot melt 21.

[0036] The temperature of the heating element 27 of the hot iron 26 is 100°C or higher. The higher this temperature, the shorter the working time can be. However, it is preferable that the temperature of the heating element 27 be below the softening temperature of the mesh 22. This is to prevent the mesh 22 from softening and the tension of the mesh 22 from decreasing.

[0037] Furthermore, when using a screen master as the mesh 22, for example, if the melting temperature of the screen master film is 260°C and the softening temperature of the mesh is 235°C, the temperature of the heating element 27 is preferably 235°C or lower.

[0038] The hot melt 21, heated and crushed by the heating element 27 of the hot iron 26, is pushed out through the hole 16 of the frame 1 into the internal space of the frame member 2. As the hot melt 21 is pushed out through the hole 16, it curls up due to surface tension, and its diameter becomes larger than the diameter of the hole 16.

[0039] As the hot melt 21 cools and hardens, as shown in Figures 5 and 6, an anchor portion 21a is formed by the portion that is extruded from the hole 16 and has a larger diameter than the hole 16. The anchor portion 21a is the part that fixes the hot melt 21 so that it does not come off the frame 1. The diameter of the anchor portion 21a is larger than the diameter of the hole 16.

[0040] The anchor portion 21a prevents the hot melt 21 from coming off the frame 1, thereby preventing the mesh 22 from peeling off the frame 1.

[0041] Since the hot melt adhesive 21 re-softens when heated, the used mesh 22 can be peeled off and a new mesh 22 can be applied. In other words, the hot melt adhesive 21 applied to the bonding surface 2a can be reused. This makes it easy to use and helps to reduce costs.

[0042] When the used mesh 22 is peeled off, some of the hot melt 21 adheres to the mesh 22, thus reducing the amount of hot melt 21 applied to the bonding surface 2a. In addition, foreign matter such as dust may get into the hot melt 21 or it may partially detach.

[0043] For this reason, the hot melt adhesive 21 applied to the adhesive surface 2a may need to be replaced. In this case, the portion of the hot melt adhesive 21 that protrudes below the adhesive surface 2a through the hole 16 is cut off with a cutter or the like to separate the hot melt adhesive 21 from the frame 1.

[0044] At this time, the fragment 21b (see Figures 7 and 8), which includes the anchor portion 21a and has been cut from the hot melt 21, falls into the lower plate portion 12 inside the frame 1. As shown in Figures 7 and 8, the fragment 21b is discharged from inside the frame 1 through the window portion 17.

[0045] As described above, the frame 1 has multiple holes 16 that penetrate from the adhesive surface 2a of the upper plate portion 11 to the lower surface. This forms anchor portions 21a in the hot melt 21 applied to the adhesive surface 2a. The anchor portions 21a prevent the hot melt 21 from coming off the frame 1, thereby preventing the hot melt 21 from peeling off the frame 1. Therefore, it is possible to reduce the peeling of the hot melt 21 from the frame 1 without using a primer containing substances harmful to the human body or the environment. Thus, with the frame 1, it is possible to fix the mesh 22 to the frame 1 with hot melt 21 without using harmful substances, while reducing the peeling of the hot melt 21 from the frame 1.

[0046] Alternatively, holes similar to the holes 16 in the upper plate portion 11 may be formed in the lower plate portion 12 so that the lower surface of the lower plate portion 12 can also be used as a bonding surface.

[0047] In the embodiment described above, the frame body 1 was formed by a frame member 2 made of an aluminum square pipe, but the frame body is not limited to being made of aluminum. Furthermore, the frame member is not limited to a square pipe, but may be a member with a U-shaped cross-section or a flat plate-shaped member.

[0048] Furthermore, the adhesive surface is not limited to a flat surface; at least a portion of it may be curved. For example, the frame member may be made of a round pipe, and a portion of the surface of the peripheral wall of the round pipe may constitute the adhesive surface. In this case, the portion of the peripheral wall of the round pipe corresponds to the plate portion having the adhesive surface.

[0049] The present invention is not limited to the embodiments described above, and the components can be modified and implemented in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiments.

[0050] [Note] This application discloses the following invention:

[0051] (Note 1) It comprises a plate portion having an adhesive surface to which hot melt is applied and to which the mesh is attached, A frame characterized in that a plurality of holes are formed in the plate portion, penetrating from the adhesive surface to the surface opposite the adhesive surface. [Explanation of symbols]

[0052] 1 frame 2 Frame members 2a Adhesion surface 11 Upper plate section 12 Lower plate part 13 Side plate part 16 holes 17 Window section 21 Hot Melt 21a Anchor section 21b Fragment 22 gauze 26. Hot soldering iron 27 Heat-generating part

Claims

[Claim 1] It comprises a plate portion having an adhesive surface to which hot melt is applied and to which the mesh is attached, A frame characterized in that a plurality of holes are formed in the plate portion, penetrating from the adhesive surface to the surface opposite the adhesive surface.

Images