JP4716849B2 - Manufacturing method and structure of eyelet - Google Patents

Description

  The present invention relates to a tarpaulin eyelet, and more specifically, an eyelet that is fixed to a peripheral portion of the tarpaulin so that a string can be passed therethrough, and is an improvement of a conventional eyelet manufacturing method and structure thereof.

  Tarpaulins are used in a wide variety of applications. For example, in freight vehicles and warehouses, tarpaulins are used to cover articles to prevent the articles from getting wet in the rain or exposed to sunlight. When covering the tarpaulin, it is necessary to fix the edge of the tarpaulin with a string, but in order to prevent the string from damaging the tarpaulin, the eyelet is fixed to the edge of the tarpaulin and the string is passed through the hole of the eyelet. It is. Moreover, the perforated part of the tarpaulin is protected by bringing the eyelet into contact with the string.

  As is well known, the above tarpaulin is formed by coating the same material polyethylene on the upper and lower surfaces of a woven fabric made of low density polyethylene and high density ethylene as weft and warp. Since it is already well known, a description thereof will be omitted to simplify the specification.

  For this reason, in order to reinforce the edge of the fabric made of tarpaulin treated as described above, after folding in half, a hole is formed in the folded portion to fix the eyelet.

  Conventional eyelets can be roughly classified into two types: aluminum eyelets and hard plastic eyelets. These conventional eyelets are composed of an upper mold and a lower mold.

  The aluminum eyelet is composed of a lower cylinder and an upper disk in the structure before mounting, and the lower cylinder is composed of a bottom plate and an upwardly directed cylinder, and the height of the cylinder is approximately 6 to 8 mm. A ring in which the inside of the circle is recessed is provided in the middle of the upper disk, and a side that is folded around is provided. The aluminum eyelet is attached to the tarpaulin by an eyelet puncher. After piercing the eyelet, the lower cylinder and upper disk are rivet-bonded and firmly crimped, and the cylindrical part of the lower cylinder is compression-molded into a protruding annular shape inside the recessed ring inside the upper disk The lower cylinder and the upper cylinder are combined with each other to form a tarpaulin. The string for fixing the tarpaulin passes through the inside of the middle hole of the eyelet and fixes the tarpaulin to the support fixture.

  The structure of the eyelet made of hard plastic is substantially the same as that of the eyelet made of aluminum, but differs in that a projection that draws a circle around the bottom plate of the lower cylinder and the bottom surface of the upper disk is provided. After the eyelet is perforated, the projection is fitted into the tarpaulin and firmly bonded.

It has been found that the two types of eyelets remain imperfect through use. That is,
1. Due to the mechanical rivet type connection formed between the lower cylinder of the eyelet and the upper disk, the eyelet and the tarpaulin contact surface cannot be bonded. That is, a gap remains between the eyelet and the tarpaulin, and if the rope is applied to the eyelet and a force is applied, the eyelet tends to loosen, and the eyelet moves along the rope on the tarpaulin. May be deformed and removed. In addition, depending on the fixation site of the eyelet, the tarpaulin may rupture, but if a portion of the tarpaulin is ruptured, the rupture site spreads very quickly, so that the entire tarpaulin must be discarded Cases arise.

  2. Tarpaulins are mostly made of plastic and are different in material from aluminum eyelets. According to foreign environmental protection requirements, tarpaulins are forced to remove aluminum eyelets whenever they expire, and as a result, aluminum eyelets cannot be recycled with tarpaulins. This will increase the burden. Further, although hard plastic eyelets can be recycled, there is a problem that they must be recycled separately due to the difference in hardness between the hard plastic eyelet and the tarpaulin.

  3. Since both aluminum eyelets and hard plastic eyelets are made of a hard material, they are easily deformed when used for a certain period of time, resulting in corners. For this reason, when a string is fixed by the worker, the worker may be injured.

  4). Manufacturing cost is high.

  5. The manufacturing process is complicated.

  6). Since the structure of the lower cylinder and the upper disk in the eyelet is different, it is necessary to transport the lower cylinder and the upper disk separately during the manufacturing process of the eyelet, and the eyelet drilling process is complicated and low in efficiency.

  7. Since the shape of the eyelet is complicated and the upper cylinder has a certain height, it occupies a lot of space during transportation.

  The present invention has been made in view of the above circumstances, and its purpose is to provide a kind of new tarpaulin eyelet, which is not firmly fixed and is not useful for environmental protection, as found in the prior art. In addition to high manufacturing costs, the problem is that the manufacturing and installation processes are complicated.

In order to achieve the above object, in the technical means of the present invention, the invention according to claim 1 is a kind of tarpaulin eyelet including upper and lower eyelets (10), and the shape of the upper and lower eyelets (10) is the same. The upper and lower eyelets (10) are annular, and the front (11) and the back (12) of the upper and lower eyelets (10) are flat. At least a plurality of circles are formed on the front of the upper and lower eyelets (10). The fixed protrusion (40) is provided with a cylindrical or conical protrusion, and the fixed protrusions (40) for drawing a plurality of circles are fixed protrusions on the inner and outer circles. The eyelet is characterized in that the arrangement interval of the fixed projections is close and the arrangement interval of the fixed protrusions in the intermediate circle is widened.

Moreover, this invention provides the eyelet of Claim 1 characterized by the said upper and lower eyelets (10) being made from a soft plastic as invention of Claim 2 .

Furthermore, the present invention is the invention according to claim 3, wherein the lower eyelet is provided with a fitting claw (31) that can be fitted into the perforation (21) of the upper eyelet. 2. The eyelet according to 2.

Furthermore, the present invention is the invention according to claim 4 , wherein the fitting claw (31) is fitted into the perforation (21) of the upper eyelet and protrudes from the upper surface of the upper eyelet. An eyelet according to claim 3 is provided.

Furthermore, the present invention is the invention according to claim 5 , wherein the fitting claw (31) is fitted into the perforation (21) of the upper eyelet and a portion protruding from the upper surface of the upper eyelet is super 5. The eyelet according to claim 4, wherein the eyelet is melted to form an edge by sonic fusion.

  When the present invention is compared with the prior art, the following advantages and positive effects can be obtained.

  1. The shape of the upper and lower eyelets of the tarpaulin is made to be the same, and a flat annular shape is formed. Adhesive welding is performed to weld the upper and lower eyelets together with the plastic tarpaulin using the energy generated by ultrasonic vibration, and the entire upper and lower eyelets are tarpaulin. As the urging force of the string on the eyelet increases, the upper and lower eyelets become more firmly coupled, and it is possible to prevent loosening and detachment.

  2. Since the upper and lower eyelets are made of soft plastic, they have the advantage of not causing environmental pollution because they are excellent in recyclability together with plastic tarpaulins.

  3. The tarpaulin is firmly bonded by the fixing protrusion of the eyelet, and the mating claw of the lower eyelet is fused to the upper surface of the upper eyelet by a crimping process to form an edge surface, thereby further strengthening the bonding and loosening or coming off Can be prevented.

  4). Similarly, since it is made of soft plastic, it has excellent elastic resilience. As a result, it does not generate corners due to deformation, and it does not cause injury.

  5. Significant cost savings can be achieved.

  6). The perforations of the assembled eyelet will not spread or the tarpaulins will be visible from there, resulting in a clean appearance and a strong bonding structure.

  7. Since the material is soft polyethylene and the structure is annular, the volume is not bulky, the box (envelope) packaging becomes easy, and the transportation space can be saved.

  As described above, the present invention is formed by welding the upper and lower eyelets and plastic tarpaulins, so that the connection is strong, the appearance is clean, the recyclability is excellent, the cost saving and the production efficiency are reduced. It is possible to achieve both improvement and further reduce the transportation space and logistics cost.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  First, the embodiment will be described with reference to FIGS. 1 to 5 as follows.

  The upper and lower eyelets 10 fixed to the front and back surfaces of the tarpaulin 50 have the same structure, both are annular, and both the front surface 11 and the rear surface 12 of the eyelet 10 are flat surfaces. The fixed projection 40 is provided so as to project upward. The arrangement interval of the fixed projections 40 that draw the outer circle and the inner circle is close, but a large number of intermediate circle fixed projections 40 are provided, and the intervals between them are close to each other. The upper and lower eyelets 10 have a thickness of 1 mm, an outer diameter of 30 mm, and an inner diameter of 12 mm. In addition, since the mixed material (that is, LDPE / HDPE) is used, the upper and lower eyelets 10 thus manufactured are relatively soft.

  As described above, the eyelet according to the present invention is also called a soft plastic eyelet because it is made of a soft material, but in the present description, it is simply called an eyelet.

  In addition, the fixed protrusions 40 can be subjected to ultrasonic welding in the above arrangement state. According to another embodiment, the fixing protrusions 40 may be arranged and welded on the front surface 11 of the eyelet so as to draw a large number of circles.

  Further, as shown in FIG. 6, the upper and lower eyelets 10 are made of an extremely soft material, so that they can be easily folded by hand, and can be folded and conveyed. Further, since it is soft, it does not break or wear, and there is no risk of injury even if the user touches the eyelet. That is, safety is improved.

  When the upper and lower eyelets 10 are mounted, the upper eyelet 10 is mounted on the front surface 51 of the plastic tarpaulin, and the lower eyelet 10 is mounted on the rear surface 52 of the tarpaulin, and the front surface 11 of the upper and lower eyelets 10, that is, the surface on which the fixing protrusion 40 is formed. The upper and lower eyelets 10 are ultrasonically welded to the tarpaulin 50 using ultrasonic welding equipment to weld the upper and lower eyelets 10 integrally with the tarpaulin 50 on the tarpaulin 50. At the time of welding, the fixing protrusion 40 formed on the front surface 11 of the upper and lower eyelets 10 that contacts the tarpaulin 50 is welded to the tarpaulin 50 while being melted by ultrasonic waves. After welding, the flat portion of the front surface 11 of the upper and lower eyelets 10 is integrated with the tarpaulin 50, and the fixing protrusion 40 is fitted into the tarpaulin 50 and welded integrally with the plastic tarpaulin 50.

  The plastic tarpaulin 20 may be fixed by passing the rope 30 through the eyelet perforation 21.

  FIG. 7 is a combined perspective view of eyelets according to another embodiment of the present invention. A plurality of fixing protrusions 40 are provided so that the upper and lower eyelets 20 and 30 face each other. In the eyelet 10 provided in a number of circles along the circumferential surface of the eyelet 10, the eyelet 10 includes an upper eyelet 20 and a lower eyelet 30, and the upper eyelet 20 has a fixed protrusion 40 on a surface facing the lower eyelet 30. Is installed, and the opposite surface is flat.

  Further, the lower eyelet 30 is provided with a fitting claw 31 that can be fitted into the perforation 21 of the upper eyelet 20, and protrudes from the upper surface of the upper eyelet 20 after joining, and is fitted by ultrasonic fusion. Is melted by the rivet effect to form an edge.

  Further, the lower eyelet 30 is also provided with a fixing projection 40 on the surface facing the upper eyelet 20, and the opposite surface is flat.

  FIG. 8 is an exploded perspective view of an eyelet according to another embodiment of the present invention. As described above, a large number of opposing fixed protrusions 40 are provided on the inner surface of the eyelet 10, and the fixed protrusions 40 are fused to the tarpaulin 50 by ultrasonic waves when attached to the tarpaulin 50.

  A fitting claw 31 is provided at the center of the lower eyelet 30 so as to protrude from the upper surface of the assembled eyelet 10, and when the upper eyelet 20 and the lower eyelet 30 are combined, the tarpaulin 50 has a gap between the perforations 21. It stops being visible from the inside and the gap is widened.

  FIG. 9 is a cross-sectional view of an eyelet according to another embodiment of the present invention, from which the operation and assembly state can be understood. FIG. 10 is a process diagram of the eyelet according to the present invention.

  The operation and process of the present invention will be described with reference to FIG. 9 and FIG. According to the eyelet manufacturing process of the present invention, the positioning step (S2) by the transfer means, the tarpaulin drilling step (S3) by the punch formed integrally with the ultrasonic horn, the upper and lower eyelets 20, 30 is transferred, and is melted while the fitting claw 31 of the lower eyelet 30 is pressed by the crimping process during the ultrasonic welding process (S4) in which the crimping is performed by the ultrasonic horn. A fusion molding step (S5), which is formed as an edge surface 32, is performed, and thereafter, a rope assembly step (S6) for combining the tarpaulin 50 to which the eyelet 10 is mounted and the rope 60 is performed.

  Specifically, first, the upper eyelet 20 and the lower eyelet 30 are positioned above and below the tarpaulin 50 by the transfer means of the ultrasonic fuser, while the upper and lower eyelets 20 and 30 are positioned on the transfer means. After punching at a fixed position of the tarpaulin 50 by a punch formed integrally with the sonic horn, the upper and lower eyelets 20 and 30 transferred to the position of the ultrasonic horn by the transfer means are transferred to the ultrasonic fuser. The ultrasonic horn is fused while descending.

  At this time, when the fitting claw 31 of the lower eyelet 30 protrudes from the upper eyelet 20 on the upper surface of the assembled eyelet 10, crimping is performed by an ultrasonic horn, and the fitting claw 31 of the lower eyelet 30. Forms an edge surface 32 while being fused to the upper surface of the upper eyelet 20.

  FIG. 11 is a view illustrating a usage state of fixing an eyelet to a tarpaulin according to another embodiment of the present invention. Referring to this, the eyelet 10 is attached to the tarpaulin 50, and the rope 60 is used through the eyelet 10. Conventionally, tarpaulins of different materials have been ruptured or damaged due to the hardness of eyelets made of aluminum or eyelets made of hard plastic. On the other hand, since the present invention is made of soft polyethylene, the edge surface 32 of the eyelet 10 is prevented from being damaged, and the tarpaulin 50 can be bent due to the softness of the material. 50 can be prevented from being damaged.

  The upper and lower eyelets 20 and 30 are made of a very soft material, can be easily folded by hand, and can be folded and transported. Furthermore, since it is made of a soft material, it does not break or wear, and even if the user touches the eyelet, there is no risk of injury, which increases safety.

  For the eyelet according to the present invention, the above-mentioned flat soft plastic eyelet by the applicant of the present application, and the conventional aluminum eyelet and hard plastic eyelet, the tensile strength and the limit force and the limit time at which tarpaulin breaks are examined, Shown in Table 1 below.

（Ａ）：硬質プラスチック製のアイレット
（Ｂ）：アルミニウム製のアイレット
（Ｃ）：平面軟質プラスチック製のアイレット
（Ｄ）：結合軟質プラスチック製のアイレット
単位＝Newton、ＦＲ：Fabric Rupture
前記表１は、韓国繊維技術研究所に依頼して行われた実験データであり、前記表１から明らかなように、本発明によるアイレットの場合、引張り強度及びターポリンの破損が起こる限界力と限界時間の側面で、従来のアルミニウム製のアイレットと硬質プラスチック製のアイレットとは顕著な違いを示している。

(A): Eyelet made of hard plastic (B): Eyelet made of aluminum (C): Eyelet made of flat soft plastic (D): Eyelet made of bonded soft plastic Unit = Newton, FR: Fabric Rupture
Table 1 shows experimental data conducted by requesting the Korea Textile Technology Research Institute. As is clear from Table 1, in the case of the eyelet according to the present invention, the ultimate strength and the limit force at which tarpaulin breakage occurs. In terms of time, conventional aluminum eyelets and hard plastic eyelets show a marked difference.

  In the above table, “Eyelet pull out” means that the tarpaulin is not ruptured or broken, but only the eyelet is detached. Say. In addition, “Eyelet Rupture” refers to a state where the eyelet is ruptured or broken when the limit force is reached.

  This is a test for the corners of the conventional eyelet (the part where the contact end surface of the eyelet and the contact surface of the tarpaulin meet) and the intermediate part (the intermediate surface where the eyelet and tarpaulin are attached), and the tensile strength due to each hardness is fragmented. It shows.

  Needless to say, the present invention is not limited to the above-described embodiments, and the present invention can be changed, modified, added, or replaced within the substantial scope of the present invention. It is regarded as belonging to the protection scope of the present invention.

It is a three-dimensional view of the eyelet of the present invention. It is a top view of the eyelet of the present invention. It is a rear view of the eyelet of this invention. It is a use state figure which fixes the eyelet of this invention to a tarpaulin. It is the sectional view on the AA line in FIG. It is a use state figure by which the eyelet with which the tarpaulin was mounted | worn is turned up. FIG. 6 is a perspective view of an eyelet coupled according to another embodiment of the present invention. FIG. 6 is an exploded perspective view of an eyelet according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of an eyelet according to another embodiment of the present invention. FIG. 6 is a process diagram of an eyelet according to another embodiment of the present invention. FIG. 6 is a view illustrating a usage state of fixing an eyelet to a tarpaulin according to another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Upper and lower eyelet 11 Front surface of upper and lower eyelet 12 Rear surface of upper and lower eyelet 20 Upper eyelet 21 Perforation 30 Lower eyelet 31 Mating claw 32 Edge surface 40 Fixing projection 50 Tarpaulin 51 Front surface of plastic tarpaulin 52 Rear surface of plastic tarpaulin 60 Rope

Claims (5)

In a kind of tarpaulin eyelet including upper and lower eyelets (10),
The shape of the upper and lower portions eyelet (10) is the same, the upper and lower eyelet (10) is an annular, front and rear (11) of the upper and lower portions eyelet (10) (12) is a plane formed eyelet, the upper and lower portions A fixed protrusion (40) that draws at least a large number of circles is provided on the front surface of the eyelet (10), and the fixed protrusion (40) has a cylindrical or conical protrusion, and the fixed protrusions (40) that draw the large number of circles. ) Is an eyelet characterized in that the arrangement intervals of the fixed protrusions in the inner circle and the outer circle are close, and the arrangement intervals of the fixed protrusions in the intermediate circle are widened. The eyelet according to claim 1 , wherein the upper and lower eyelets (10) are made of soft plastic . The eyelet according to claim 1, wherein the lower eyelet is provided with a fitting claw (31) that can be fitted into a perforation (21) of the upper eyelet. The fitting claw (31), according to claim 3, wherein the eyelets characterized that you have been projected than the upper surface of the fitted upper eyelet perforation of the upper eyelet (21). The fitting claw (31) is fitted into the perforation (21) of the upper eyelet, and a portion protruding from the upper surface of the upper eyelet is melted by ultrasonic fusion to form an edge. The eyelet according to claim 4, wherein

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