Method for producing sheet products with eyelets

Abstract

To provide a method for manufacturing a sheet product having an eyelet.SOLUTION: The method of the invention comprises providing a sheet comprising one or more perforations, positioning an eyelet such that the eyelet contacts the sheet around the one or more perforations, and fusing the eyelet to the sheet using ultrasound under a predetermined pressure. In one embodiment, fusing the eyelet to the sheet with ultrasonic waves under the predetermined pressure can include bonding the eyelet to the sheet by emitting ultrasonic waves to the eyelet and the sheet for a first time period while applying the predetermined pressure to the eyelet and the sheet, and ceasing emitting the ultrasonic waves and continuing to apply the predetermined pressure to the eyelet and the sheet for a second time period.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a sheet product having an eyelet and to the eyelet. [Background technology]

[0002] In recent years, synthetic resin eyelets have been increasingly used instead of aluminum eyelets due to their ease of disposal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4716849 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional sheet products equipped with synthetic resin grommets have had problems with the strength of the grommets, as pulling the area around the grommets with too much force can cause the grommets to separate from the sheet or the grommets themselves to deform.

[0005] An object of the present invention is to provide a sheet product having synthetic resin grommets of sufficient strength. [Means for solving the problem]

[0006] In one aspect of the present invention, a method of producing a sheet product having grommets includes providing a sheet having one or more perforations, positioning the grommets so that the grommets contact the sheet around the one or more perforations, and fusing the grommets to the sheet using ultrasound under a predetermined pressure.

[0007] In one embodiment of the present invention, fusing the eyelet to the sheet using the ultrasonic waves under the predetermined pressure may include bonding the eyelet to the sheet by oscillating the ultrasonic waves to the eyelet and the sheet for a first time while applying the predetermined pressure to the eyelet and the sheet, and stopping the oscillation of the ultrasonic waves and continuing to apply the predetermined pressure to the eyelet and the sheet for a second time.

[0008] In one embodiment of the present invention, the first period of time may be between about 0.15 seconds and about 0.4 seconds.

[0009] In one embodiment of the present invention, the first period of time may be between about 0.2 seconds and about 0.3 seconds.

[0010] In one embodiment of the present invention, the second period of time may be between about 0.2 seconds and about 0.3 seconds.

[0011] In one embodiment of the present invention, the second period of time may be between about 0.23 seconds and about 0.28 seconds.

[0012] In one embodiment of the present invention, the eyelet may have a circular ring shape, an outer diameter of the eyelet may be about 28 mm to about 40 mm, and an inner diameter of the eyelet may be about 11 mm to about 20 mm.

[0013] In one embodiment of the present invention, the eyelet is composed of a first eyelet member and a second eyelet member, and positioning the eyelet so that it contacts the sheet around the one or more perforations includes sandwiching the sheet around the one or more perforations between the first eyelet member and the second eyelet member, and fusing the eyelet to the sheet using ultrasonic waves under the predetermined pressure may include oscillating the ultrasonic waves to the first eyelet member, the second eyelet member, and the sheet under the predetermined pressure with the sheet around the one or more perforations sandwiched between the first eyelet member and the second eyelet member.

[0014] In one embodiment of the present invention, the second eyelet member has one or more protrusions, and the first eyelet member has one or more recesses corresponding to the one or more protrusions, and fusing the eyelet to the sheet using the ultrasonic waves under the predetermined pressure may include oscillating the ultrasonic waves to the one or more protrusions, the one or more recesses, and the sheet under the predetermined pressure, so that the sheet around the one or more protrusions and the one or more recesses becomes integrated with the one or more protrusions and the one or more recesses, and adhering the eyelet to the sheet.

[0015] In one embodiment of the present invention, the eyelets may be made of synthetic resin, and the sheet may be made of synthetic resin.

[0016] In one embodiment of the present invention, in a strength test using the trapezoid method of JIS L1096, the strength of the grommets in the sheet product may be approximately 100% or more of the strength of a sheet without the grommets.

[0017] In one aspect of the present invention, the eyelet of the present invention is an eyelet for reinforcing one or more perforations provided in a sheet of a sheet product, the eyelet being composed of a first eyelet member and a second eyelet member, the first eyelet member and the second eyelet member being fused to the sheet in a state in which they are arranged to sandwich the sheet of the sheet product around the one or more perforations, and in a strength test using the trapezoid method of JIS L1096, the strength of the eyelet in the sheet product is approximately 100% or more of the strength of a sheet without the eyelet.

[0018] In one embodiment of the present invention, in the strength test, the strength of the eyelets in the sheet product may be about 110% to about 200% of the strength of a sheet without the eyelets.

[0019] In one embodiment of the present invention, the eyelet may have a circular ring shape, an outer diameter of the eyelet may be about 28 mm to about 40 mm, and an inner diameter of the eyelet may be about 11 mm to about 20 mm.

[0020] In one embodiment of the present invention, the eyelets may be made of synthetic resin, and the sheet may be made of synthetic resin. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a sheet product having sufficient eyelet strength by fusing the eyelets to the sheet. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is an exploded perspective view showing an example of the configuration of the sheet 100 and the area around the eyelet 200 in the sheet product 10. FIG. [Figure 2] An example of the configuration of an apparatus 300 for fusing the eyelets 200 to the sheet 100 is shown. [Figure 3] 3 shows an embodiment of a device 300. [Figure 4] An example of a method for manufacturing a sheet product 10 in which eyelets 200 are fused to a sheet 100 will be described. [Figure 5A] This shows the test specimen used in the trapezoid method strength test of JIS L1096. [Figure 5B] This shows the state in which a test piece used in the strength test of the trapezoid method of JIS L1096 is held by a holding member. [Figure 5C] This shows the state in which a test piece used in the trapezoid method strength test of JIS L1096 is pulled by a gripping member. [Figure 6A] The test results of Examples 1 to 6 based on the strength test using the trapezoid method of JIS L1096 are shown. [Figure 6B] The test results of Examples 7 to 11 based on the strength test of the trapezoid method of JIS L1096 are shown. DETAILED DESCRIPTION OF THE INVENTION

[0023] The applicant proposes to manufacture a sheet product with strong eyelets by fusing the eyelets to the sheet using ultrasound under a predetermined pressure. For example, if the ultrasound oscillation time is too long, the eyelets and the sheet may be burned. Conversely, if the ultrasound oscillation time is too short, the eyelets and the sheet may not be sufficiently fused together. Therefore, the applicant has devised a method and conditions for fusing the eyelets to the sheet, thereby achieving the manufacture of a sheet product with strong eyelets.

[0024] The terms used in this specification are defined below.

[0025] "Sheet product" refers to a product in which grommets are provided on the sheet.

[0026] The "strength of an eyelet" in a sheet product refers to the maximum tensile force recorded over time in a strength test using the trapezoid method of JIS L1096 by continuously pulling on the area around the eyelet of a sheet product equipped with an eyelet.

[0027] "Sheet without grommets" refers to the sheet portion of a sheet product that is 10 cm or more away from the grommets within the entire sheet product, or a sheet identical to that sheet but that does not have grommets.

[0028] "Strength of sheet without grommets" refers to the maximum tensile force recorded over time when a sheet without grommets is continuously pulled in a strength test using the trapezoid method of JIS L1096.

[0029] The term "about," unless expressly stated otherwise, refers to ±10% of the immediately preceding value.

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0031] FIG. 1 is an exploded perspective view showing an example of the configuration of a sheet 100 and the area around an eyelet 200 in a sheet product 10. FIG.

[0032] The sheet 100 has one or more perforations 110. A long object such as a rope can be passed through the one or more perforations 110 of the sheet 100.

[0033] The eyelets 200 are arranged so that the eyelets 200 contact the sheet 100 around one or more perforations 110. In the embodiment shown in Fig. 1 , the eyelets 200 are composed of a first eyelet member 210 and a second eyelet member 220. In the embodiment shown in Fig. 1 , the first eyelet member 210 and the second eyelet member 220 are arranged so as to sandwich the sheet 100 in the sheet product 10 around one or more perforations 110.

[0034] With first eyelet member 210 and second eyelet member 220 arranged so as to sandwich sheet 100 around one or more perforations 110, a predetermined pressure is applied to sheet 100 and eyelet 200, and ultrasonic waves are applied under the predetermined pressure. This causes a portion of eyelet 200 to fuse with a portion of sheet 100, thereby enabling eyelet 200 to be fused to sheet 100.

[0035] 1 , second eyelet member 220 has one or more protrusions 221, and first eyelet member 210 has one or more recesses (not shown) corresponding to the one or more protrusions of second eyelet member 220. As a result, by oscillating ultrasonic waves to one or more protrusions 221 of second eyelet member 220, one or more recesses of first eyelet member 210, and sheet 100 under a predetermined pressure, sheet 100 around one or more protrusions 221 of second eyelet member 220 and one or more recesses of first eyelet member 210 becomes integrated with one or more protrusions 221 of second eyelet member 220 and one or more recesses of first eyelet member 210, and eyelet 200 can be bonded to sheet 100.

[0036] The thickness of the sheet 100 may be about 0.08 mm to about 0.4 mm. The thickness of the sheet 100 may be, for example, about 0.4 mm to about 0.3 mm, about 0.3 mm to about 0.2 mm, or about 0.2 mm to 0.1 mm, and more specifically, 0.35 mm, 0.22 mm, or 0.15 mm. The sheet 100 may be made of, for example, a synthetic resin, although the present invention is not limited thereto. The sheet 100 may be made of, for example, polyethylene, polypropylene, or polyvinyl chloride (PVC).

[0037] In the embodiment shown in Fig. 1, the eyelet 200 has a circular ring shape. In this case, the outer diameter of the eyelet 200 may be about 28 mm to about 40 mm, and the inner diameter of the eyelet 200 may be about 11 mm to about 20 mm. The eyelet 200 may be made of, for example, a synthetic resin, but the present invention is not limited thereto. The eyelet 200 may be made of, for example, polyethylene, polypropylene, or polycarbonate.

[0038] 1, for convenience, one perforation of the one or more perforations 110 is shown on the sheet 100. Also, in the embodiment shown in FIG. 1, for convenience, one eyelet 200 is shown adjacent to the sheet 100, but the present invention is not limited thereto. The number of eyelets 200 on the sheet 100 may be any number equal to or greater than one.

[0039] 1 describes a combination of the second eyelet member 220 having one or more protrusions 221 and the first eyelet member 210 having one or more recesses corresponding to the one or more protrusions of the second eyelet member 220, but the present invention is not limited to this. For example, the second eyelet member 220 may have one or more protrusions 221, and the first eyelet member 210 may have one or more protrusions corresponding to the one or more protrusions of the second eyelet member 220. Alternatively, the second eyelet member 220 may have one or more protrusions 221, and the first eyelet member 210 may have a flat surface. Alternatively, the second eyelet member 220 may have a flat surface, and the first eyelet member 210 may have one or more protrusions.

[0040] 1, an example has been described in which second eyelet member 220 includes one or more protrusions 221 that are independent of each other, but the present invention is not limited to this. For example, first eyelet member 210 and / or second eyelet member 220 may include one or more protrusions that extend continuously in the circumferential direction.

[0041] 1 shows that the pressure and ultrasonic waves are applied from the side of first eyelet member 210, but the present invention is not limited to this. The pressure and ultrasonic waves may be applied from any direction as long as they can be applied to sheet 100 and eyelet 200.

[0042] 1 has been described as an example in which the eyelet 200 is composed of the first eyelet member 210 and the second eyelet member 220, but the present invention is not limited to this. As long as the eyelet 200 can be fused to the sheet 100, the eyelet 200 may be configured to be arranged on both sides of the sheet 100 so as to sandwich the sheet 100 as shown in FIG. 1, or may be configured to be arranged on only one side of the sheet 100.

[0043] In a strength test using the trapezoid method of JIS L1096, the strength of the eyelets 200 in the sheet product 10 is about 100% or more, preferably about 110% or more, and more preferably about 120% or more of the strength of the portion of the sheet product 10 without the eyelets.

[0044] In the sheet product 10 of the present invention in which the sheet 100 is provided with grommets 200, the strength of the grommets 200 in the sheet product 10 in a strength test by the trapezoid method of JIS L1096 can be about 120 N or more, preferably about 140 N or more, and particularly preferably 160 N or more. In a preferred embodiment, in the sheet product 10 in which the grommets 200 are provided in the sheet 100 of about 0.4 mm to about 0.3 mm, the strength of the grommets 200 in the sheet product 10 in a strength test by the trapezoid method of JIS L1096 can be about 140 N or more, preferably about 160 N or more, and particularly preferably 180 N or more. In another preferred embodiment, in a sheet product 10 having grommets 200 provided in a sheet 100 having a thickness of about 0.3 mm to about 0.2 mm, the strength of the grommets 200 in the sheet product 10 in a strength test using the trapezoid method of JIS L1096 can be about 120 N or more, preferably about 140 N or more, and particularly preferably about 160 N or more. In a sheet product 10 of the present invention having grommets 200 provided in a sheet 100, the strength of the grommets 200 in the sheet product 10 in a strength test using the trapezoid method of JIS L1096 can be about 250 N or less, or about 220 N or less. The area of ​​the sheet product 10 can be at least 180 cm × at least 180 cm or more.

[0045] FIG. 2 shows an example of the configuration of an apparatus 300 for fusing the eyelets 200 to the sheet 100. As shown in FIG.

[0046] 2, device 300 includes a processor portion 310, a memory portion 320, an ultrasonic source 330, and a pressure source 340. Device 300 may further include a processing area 350 for receiving the eyelet and applying ultrasonic waves and pressure to the eyelet.

[0047] The memory unit 320 stores programs required to execute processing, data required to execute the programs, and the like. Here, how the programs are stored in the memory unit 320 is not important. For example, the programs may be pre-installed in the memory unit 320. Alternatively, the programs may be installed in the memory unit 320 by being downloaded via a network such as the Internet, or may be installed in the memory unit 320 via a storage medium such as an optical disc or USB.

[0048] The processor unit 310 controls the overall operation of the device 300. The processor unit 320 reads and executes a program stored in the memory unit 320. This enables the device 300 to function to execute desired steps, and the processor unit 320 of the device 300 can operate as a means for achieving desired functions.

[0049] The ultrasonic source 330 is configured to be able to emit desired ultrasonic waves. For example, the ultrasonic source 330 is configured to be able to emit desired ultrasonic waves toward the processing area 350. The desired frequency of the ultrasonic waves is, for example, but not limited to, about 15 kHz to about 30 kHz, about 15 kHz to about 25 kHz, about 15 kHz to about 20 kHz, about 20 kHz to about 30 kHz, about 20 kHz to about 25 kHz, and about 17 kHz to about 23 kHz.

[0050] The pressure source 340 is configured to be able to apply a desired pressure. For example, the pressure source 340 is configured to be able to apply a desired pressure toward the processing area 350. The magnitude of the desired pressure is, for example, but not limited to, about 0.6 MPa to about 0.8 MPa, about 0.6 MPa to about 0.7 MPa, or about 0.7 MPa to about 0.8 MPa.

[0051] FIG. 3 shows an embodiment of an apparatus 300 .

[0052] 3, the apparatus 300 further includes an elongated member 360 for guiding and directing pressure and ultrasound onto a processing area 350 of the apparatus 300. The elongated member 360 is configured to communicate with the ultrasound source 330, thereby allowing ultrasound waves from the ultrasound source 330 to be emitted onto the processing area 350 through the elongated member 360. The elongated member 360 is also configured to communicate with the pressure source 340, thereby allowing pressure from the pressure source 340 to be applied onto the processing area 350 through the elongated member 360.

[0053] 3, the apparatus 300 may further include a transport means 370 (not shown) for transporting the eyelets 200 (e.g., the first eyelet member 210 and the second eyelet member 220) to the processing area 350 of the apparatus 300. The apparatus 300 may also include a switch 380 (not shown) for starting the generation of ultrasonic waves from the ultrasonic source 330 and the application of pressure from the pressure source 340.

[0054] For example, after the eyelets 200 are transported to the processing area 350 by the transport means 370, the user of the apparatus 300 places the sheet 100 on the processing area 350 so that the perforations 110 in the sheet 100 are aligned with the eyelets 200, and presses the switch 380. This enables the pressure source 340 to apply pressure to the eyelets 200 on the processing area 350, and the ultrasonic source 330 to oscillate ultrasonic waves to the eyelets 200 on the processing area 350. In this way, by applying pressure and ultrasonic waves to the eyelets 200 on the processing area 350, the eyelets 200 can be fused to the sheet 100 around the perforations 110 to obtain the sheet product 10 of the present invention.

[0055] Alternatively, for example, after the second eyelet member 220 is transported to the processing area 350 by the transport means 370, the user of the apparatus 300 places the sheet 100 on the processing area 350 so that the perforations 110 in the sheet 100 are aligned with the second eyelet member 220, and presses the switch 380. As a result, the conveying means 370 conveys the first eyelet member 210 over the perforation 110 in the sheet 100 so that the first eyelet member 210 is aligned with the perforation 110 and the second eyelet member 220 in the sheet 100, and the sheet 100 around the perforation 110 is sandwiched between the first eyelet member 210 and the second eyelet member 220, and the pressure source 340 is capable of applying pressure to the first eyelet member 210 and the second eyelet member 220 on the processing area 350, and the ultrasonic source 330 is capable of oscillating ultrasonic waves to the first eyelet member 210 and the second eyelet member 220 on the processing area 350. In this way, by applying pressure and ultrasound to the first eyelet member 210 and the second eyelet member 220 on the treatment area 350, it is possible to fuse the first eyelet member 210 and the second eyelet member 220 to the sheet 100 around the perforation 110.

[0056] Fig. 4 shows an example of a method for manufacturing a sheet product 10 in which eyelets 200 are fused to a sheet 100. Steps S402 and S403 shown in Fig. 4 can be performed using the apparatus 300 shown in Fig. 2. Each step shown in Fig. 4 will be described below.

[0057] Step S401: A sheet 100 with one or more perforations 110 is provided.

[0058] Step S402: The eyelet 200 is positioned so that the eyelet 200 contacts the sheet 100 around one or more perforations 110. This is achieved, for example, by aligning the eyelet 200 with the perforations 110 of the sheet 100 on the processing area 350. For example, if the eyelet 200 is composed of a first eyelet member 210 and a second eyelet member 220, step S402 is achieved by sandwiching the sheet 100 around the one or more perforations 110 between the first eyelet member 210 and the second eyelet member 220.

[0059] Step S403: Under a predetermined pressure, the eyelet 200 is fused to the sheet 100 using ultrasound. The predetermined pressure may be generated by a pressure source 340. The predetermined pressure may be, for example, about 0.6 MPa to about 0.8 MPa. The ultrasound may be generated by an ultrasound source 330. The frequency of the ultrasound may be, for example, about 15 kHz to about 30 kHz.

[0060] For example, when the eyelet 200 is composed of a first eyelet member 210 and a second eyelet member 220, step S403 is achieved by sandwiching the sheet 100 around one or more perforations 110 between the first eyelet member 210 and the second eyelet member 220, and oscillating ultrasonic waves to the first eyelet member 210, the second eyelet member 220, and the sheet 100 under a predetermined pressure.

[0061] Also, for example, if the second eyelet member 220 has one or more protrusions 221 and the first eyelet member 210 has one or more recesses corresponding to the one or more protrusions 221 of the second eyelet member 220, step S403 includes oscillating ultrasonic waves under a predetermined pressure to the one or more protrusions 221 of the second eyelet member 220, the one or more recesses of the first eyelet member 210, and the sheet 100, so that the sheet 100 around the one or more protrusions 221 of the second eyelet member 220 and the one or more recesses of the first eyelet member 210 becomes integrated with the one or more protrusions 221 of the second eyelet member 220 and the one or more recesses of the first eyelet member 210, and adheres the eyelet 200 to the sheet 100.

[0062] For example, fusing the eyelet 200 to the sheet 100 (a) applying a predetermined pressure to the eyelet 200 and the sheet 100 while oscillating ultrasonic waves to the eyelet 200 and the sheet 100 for a first time period, thereby bonding the eyelet 200 to the sheet 100; (b) stopping the ultrasonic oscillation and continuing to apply a predetermined pressure to the eyelet 200 and the sheet 100 for a second time period; This can be achieved by performing the following.

[0063] The first time period in step (a) is a melting time during which ultrasonic waves are applied to the eyelet 200 and the sheet 100 while the eyelet 200 and the sheet 100 are compressed together at a predetermined pressure to fuse the eyelet 200 and the sheet 100 together. The first time period (melting time) is, for example, about 0.15 seconds to about 0.4 seconds, and preferably about 0.2 seconds to about 0.3 seconds. The second time period in step (b) is a solidification time during which the fused eyelet 200 and the sheet 100 are further compressed together at a predetermined pressure. The second time period (solidification time) is, for example, about 0.2 seconds to about 0.3 seconds, and preferably about 0.23 seconds to about 0.28 seconds. [Example]

[0064] Using the apparatus 300 shown in FIG. 3, the eyelets 200 were fused to various sheets 100 under various conditions of melting time and solidification time, and sheet products 10 provided with the eyelets 200 were manufactured.

[0065] <Manufacturing conditions> The conditions common to all of Examples 1 to 9 described below are as follows. Device 300 voltage: AC200V Device 300 current: 10A Output of Device 300: Approx. 1400W Frequency of ultrasonic waves from ultrasonic source 330: approximately 20 kHz Pressure from pressure source 340: Approximately 0.6 MPa to approximately 0.8 MPa Sheet: Polyethylene Eyelets: Polyethylene Test room temperature: 22°C

[0066] The melting time, solidification time, and sheet conditions for each of Examples 1 to 9 are as follows: In Table 1, the sheet with a thickness of 0.35 mm is referred to as "Type 1," and the sheet with a thickness of 0.22 mm is referred to as "Type 2." [Table 1]

[0067] <Strength test method> In this specification, the term "strength test by the trapezoid method of JIS L1096" refers to a test carried out according to the following procedure.

[0068] procedure As shown in FIG. 5A, a 200 mm x 50 mm test piece of sheet product 10 is prepared. The eyelet is located approximately in the longitudinal center of the test piece and adjacent to one of the lateral edges. A cut is made several centimeters (e.g., 3 cm) from one lateral edge to the eyelet. Next, a gripping line is drawn on the test piece to form a trapezoid with an upper base of 40 mm and a lower base of 70 mm, with the line connecting the center of the upper base and the center of the lower base aligned with the center of the eyelet 200. Next, as shown in FIG. 5B, the test piece is gripped along the gripping line using a gripping member and pulled in the longitudinal direction. The strength test is terminated when the test piece breaks approximately to the lateral center, as shown in FIG. 5C. The measuring instrument used for the "JIS L1096 Trapezoid Method Strength Test" is, for example, the AG-10kNG manufactured by Shimadzu.

[0069] The strength of the grommets 200 in the sheet products 10 produced in each of Examples 1 to 9 was measured using a JIS L1096 trapezoid strength test. For comparison, the strength of sheets without grommets was also measured for Examples 10 and 11. The test method for the JIS L1096 trapezoid strength test in Examples 10 and 11 was the same as that in Examples 1 to 9, except for the presence or absence of grommets. Furthermore, considering variations in the state of the sheet products 10 due to the manufacturing process, the same JIS L1096 trapezoid strength test was performed three or four times in each Example. For example, in Example 1, four sheet products were produced under the same conditions as in Example 1, and each of the four sheet products was subjected to a JIS L1096 trapezoid strength test. For example, in Example 2, three sheet products were produced under the same conditions as in Example 2, and each of the three sheet products was subjected to a JIS L1096 trapezoid strength test.

[0070] <Strength test results> 6A and 6B show graphs of the strength of the grommets 200 in the sheet products 10 produced in Examples 1 to 9, and the strength of the sheets without grommets in Examples 10 and 11. In each of the graphs for Examples 1 to 11, the magnitude of the load (i.e., strength) is shown on the vertical axis, and the amount of movement of the gripping members as a result of the gripping members pulling the sheet product is shown on the horizontal axis.

[0071] In each example, the average value of the strength of the eyelets 200 measured multiple times is shown in Table 2 as the "strength of the eyelets in the sheet product," and the average value of the strength of the sheet without eyelets is shown in Table 2 as the "strength of the sheet without eyelets." [Table 2]

[0072] Comparing the test results of Example 1 and Example 10, in the sheet product 10 having the Type 1 sheet, the strength of the grommets 200 in the sheet product 10 was 140.9 / 120.3 = approximately 117% of the strength of the sheet without grommets.

[0073] Comparing the test results of Example 4 with those of Example 10, in the sheet product 10 having the Type 1 sheet, the strength of the grommets 200 in the sheet product 10 was 192.5 / 120.3 = approximately 160% of the strength of the sheet without grommets.

[0074] Comparing the test results of Example 8 with those of Example 11, in the sheet product 10 having a type 2 sheet, the strength of the grommets 200 in the sheet product 10 was 140.3 / 109.9 = approximately 128% of the strength of a sheet without grommets.

[0075] <Strength test evaluation> The test results of Examples 1 & 10, 4 & 10, and 8 & 11 show that the strength of the eyelets 200 in the sheet product 10 is approximately 100% or more of the strength of a sheet without eyelets. Furthermore, the test results of Examples 4 & 10 and 8 & 11 show that the rate of increase in the strength of the eyelets in the sheet product was 160% ÷ 128% = 1.25, so in the case of a sheet product including a sheet with a thickness of 0.35 mm, it can be estimated that the strength of the eyelets in the sheet product is 160 × 1.25 = approximately 200% of the strength of a sheet without eyelets. From the above, it was found that even though the sheet 100 and the eyelets 200 were partially melted, the strength of the eyelets 200 in the sheet product 10 was approximately 100% or more (specifically, approximately 110% to approximately 200%) of the strength of a sheet without eyelets, regardless of the sheet type, and in particular, approximately 110% to approximately 160% in sheet products having a type 1 or type 2 sheet.

[0076] Comparing the test results of Examples 1 & 10 with those of Examples 8 & 11, it was found that only the sheet type was different, and the strength of the eyelets 200 in the sheet product 10 relative to the strength of the sheet without eyelets was approximately 120% in both cases, which showed that the strength of the eyelets 200 in the sheet product 10 relative to the strength of the sheet without eyelets showed a similar tendency regardless of the sheet type.

[0077] When the melting time was 0.43 seconds, the sheet 100 and the eyelet 200 were burned regardless of the length of the solidification time, and when the melting time was 0.1 seconds or less, the eyelet 200 was not sufficiently adhered to the sheet 100 regardless of the length of the solidification time. Therefore, it was found that the melting time is preferably about 0.15 seconds to about 0.4 seconds, and more preferably about 0.2 seconds to about 0.3 seconds.

[0078] When the solidification time was less than 0.2 seconds, the eyelet 200 did not adhere sufficiently to the sheet 100 regardless of the length of the melting time, and therefore it was found that the solidification time is preferably at least about 0.2 seconds, more preferably about 0.2 seconds to about 0.3 seconds, and even more preferably about 0.23 seconds to about 0.28 seconds.

[0079] In this way, by fusing the eyelets 200 to the sheet 100 using both the melting time and the solidification time at appropriate lengths, it is possible to manufacture a sheet product 10 with eyelets that has sufficient strength that is higher than the strength of the sheet 100 without eyelets.

[0080] As described above, the present invention has been illustrated using the preferred embodiment of the present invention, but the present invention should not be interpreted as being limited to this embodiment. It is understood that the scope of the present invention should be interpreted only by the claims. It is understood that a person skilled in the art can implement an equivalent scope based on the description of the present invention and common technical knowledge from the description of the specific preferred embodiment of the present invention. [Industrial Applicability]

[0081] The present invention is useful for providing a sheet product or the like having sufficient eyelet strength by fusing eyelets to a sheet. [Explanation of symbols]

[0082] 10 Sheet Products 100 sheets 110 One or more perforations 200 eyelets 210 First eyelet member 220 Second eyelet member 300 equipment 310 Processor Unit 320 Memory section 330 Ultrasonic Source 340 Pressure Source 350 processing area 360 Slender Members 370 Means of transport 380 Switch

Claims

1. 1. A method for manufacturing a sheet product having grommets, the method comprising: providing a sheet having one or more perforations; positioning the grommet such that the grommet contacts the sheet around the one or more perforations; fusing the eyelets to the sheet using ultrasonic waves under a predetermined pressure; A method comprising:

2. The step of fusing the eyelet to the sheet using the ultrasonic wave under the predetermined pressure includes: bonding the eyelet to the sheet by oscillating the ultrasonic waves to the eyelet and the sheet for a first time while applying the predetermined pressure to the eyelet and the sheet; stopping the oscillation of the ultrasonic waves and continuing to apply the predetermined pressure to the eyelet and the sheet for a second time period; The method of claim 1 , comprising:

3. The method of claim 2 , wherein the first period of time is between about 0.15 seconds and about 0.4 seconds.

4. The method of claim 3 , wherein the first period of time is between about 0.2 seconds and about 0.3 seconds.

5. The method of claim 2 , wherein the second period of time is between about 0.2 seconds and about 0.3 seconds.

6. The method of claim 5 , wherein the second period of time is between about 0.23 seconds and about 0.28 seconds.

7. The eyelet has a circular ring shape, 10. The method of claim 1, wherein the outer diameter of the eyelet is between about 28 mm and about 40 mm, and the inner diameter of the eyelet is between about 11 mm and about 20 mm.

8. The eyelet is composed of a first eyelet member and a second eyelet member, Arranging the eyelets so that the eyelets contact the sheet around the one or more perforations includes sandwiching the sheet around the one or more perforations between the first eyelet member and the second eyelet member; 2. The method of claim 1, wherein fusing the eyelet to the sheet using ultrasonic waves under the predetermined pressure comprises: oscillating ultrasonic waves to the first eyelet member, the second eyelet member, and the sheet under the predetermined pressure while the sheet around the one or more perforations is sandwiched between the first eyelet member and the second eyelet member.

9. the second eyelet member has one or more protrusions, the first eyelet member has one or more recesses corresponding to the one or more protrusions, The step of fusing the eyelet to the sheet using the ultrasonic wave under the predetermined pressure includes: By applying the ultrasonic waves to the one or more protrusions, the one or more recesses, and the sheet under the predetermined pressure, the sheet around the one or more protrusions and the one or more recesses is integrated with the one or more protrusions and the one or more recesses, and the eyelet is bonded to the sheet. The method of claim 8, comprising:

10. The method of claim 1 , wherein the eyelets are made of a synthetic resin and the sheet is made of a synthetic resin.

11. The method according to any one of claims 1 to 10, wherein in a strength test using the trapezoid method of JIS L1096, the strength of the grommets in the sheet product is about 100% or more of the strength of a sheet without the grommets.

12. A grommet for reinforcing one or more perforations provided in a sheet of a sheet product, the grommet being composed of a first grommet member and a second grommet member, the first grommet member and the second grommet member being fused to the sheet in a state in which they are arranged to sandwich the sheet of the sheet product around the one or more perforations, and in a strength test using the trapezoid method of JIS L1096, the strength of the grommet in the sheet product is approximately 100% or more of the strength of a sheet without the grommet.

13. The grommet according to claim 12, wherein in the strength test, the strength of the grommet in the sheet product is about 110% to about 200% of the strength of a sheet without the grommet.

14. The eyelet has a circular ring shape, The eyelet according to claim 12 or claim 13, wherein the outer diameter of the eyelet is about 28 mm to about 40 mm, and the inner diameter of the eyelet is about 11 mm to about 20 mm.

15. The eyelet according to claim 12 or 13, wherein the eyelet is made of a synthetic resin, and the sheet is made of a synthetic resin.

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