KR101500312B1 - Foam sheet stairs winding type fender, and manufacturing method - Google Patents

Abstract

The present invention relates to a fender used to relieve the shock produced when crashing into a pier or the other vessel in a berth facility or a dockyard. The present invention can improve productivity since a cutting work for end portions of both sides of the fender is unnecessary and material loss is little, and the present invention can make a more solid fender by dispersing stress produced on a contact line by alternatively arranging as well as minimizing the contact line between foam sheets. The present invention can effectively prevent torsion of the fender since a reinforcement rib responses to the torsion force even when receiving the torsion force from the end portions of the fender since the reinforcement rib of an end fitting member is fixed inside a foam core.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for manufacturing a step-wise insectproof material,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fender used to mitigate an impact generated when a ship collides with a ship or a ship at a shipyard or a shipyard. More specifically, A step-wise type insect proof material capable of effectively preventing breakage of the insect proof material in response to a warp force of the reinforcing rib even when a warp force is applied to both ends of the insect proof material because it is fixed to the inside of the insect proof material, ≪ / RTI >

In general, fenders are structures that are used to mitigate the impact of a ship in a shipyard or shipyard when colliding with a ship or a ship.

The insectproof material is called a pneumatic fender in which the body is made of a tube and the inside of the body is filled with compressed air, and a foamed synthetic resin such as a polyurethane foam is used as a body is called a foam-filled fender .

The pneumatic insectproof material may cause the air inside the tube to escape due to manufacturing defects or external impacts, and in some cases, the tube constituting the body may be completely ruptured due to strong external pressure, especially in the case of a bad weather such as a typhoon. When the body is completely ruptured, the insecticide completely loses its function and damages the hull. Therefore, the insecticide is frequently used in recent years.

However, the conventional foam-type insectproof material uses a certain type of mold to foam-mold the synthetic resin to produce a foam core. Therefore, it is difficult to manufacture a insectproof material suitable for the field situation due to the size and shape of the insectproof material being constant, and there is a disadvantage that the impact resistance is also weak.

In order to overcome such disadvantages, Korean Patent Registration No. 749340 discloses a foam sheet winding type insect repellent material which is produced by continuously winding a foam sheet made of a polyethylene material on a rotating shaft while thermally fusing the same.

The foam sheet retractable insectproof material has an advantage in that it can be freely manufactured in size and shape as compared with the conventional mold insect proof material. However, when the insect proof material has a length larger than the width of the foam sheet, two or more cores 1 1 'are connected to each other by a shaft 3 and a stopper 5, the diameter of the two cores 1 and 1' is not completely equal to each other, and a step is formed on the surface of the body. If the impact is applied, there is a high possibility that the adhesive portion between the two cores 1, 1 'is separated.

Further, as shown in 1b, after inserting both ends of the insectproof material into a rectangular shape at the time of winding the foam sheet, a right angle portion of both end faces of the insectproof material is cut into a conical shape using a blade by a post- . However, there is a problem that post-processing is not easy and material loss is large.

On the other hand, as shown in Fig. 2, the foam tape winding type insectproof material disclosed in the Japanese Patent Registration No. 10-0939305 includes a cylindrical shaft 20 made of a hollow shaft 10 and a foam tape 20 wound thereon And an outer layer 30 applied to the outer surface of the core 20.

3, the conventional retractor 50 includes a rotation unit 52 that rotates the hollow shaft 10 by holding both boss portions 12 (see FIG. 2) of the hollow shaft 10, A reel cradle 53 for installing a reel around which the foam tape 20 is wound, a carrier 54 for moving the foam tape 20 provided on the reel 10 back and forth along the hollow shaft 10, And a control unit 55 for controlling the rotation speed of the rotation unit 52, the movement speed and movement distance of the pallet 54, and the like. Reference numeral 56 denotes a support shaft for supporting the pallet 54.

In the winding device 50, the hollow shaft 10 rotates in accordance with the information input to the control unit 55, and the carrier 54 gradually moves along the hollow shaft 10, And the foam tape 20 is wound obliquely between the flanges 11 (see Fig. 2). After winding one layer, the transporting belt 54 reverses the winding angle of the foam tape 20 by reversing the direction of movement of the carrier 54 at the other end of the hollow shaft 10, and winds the layer again.

In the same manner, the foam tape 20 is successively layered on the hollow shaft 10 one by one, thereby completing the cylindrical core 20 '. At this time, the winding angle of the foam tape 20 in the upper and lower layers adjacent to each other in the core 20 'cross each other in opposite directions. The foam tape 20 is heated and melted on the pallet 54 to form the core 20 'so that the upper and lower layers are thermally fused together.

However, the foam tape winding type insectproof material disclosed in the Korean Patent Registration No. 10-0939305 has a problem in that the foam tape 20, which is elongated at a constant width (150-250 mm), is produced by winding one layer at a time spirally, There is an advantage in that it can be manufactured regardless of the size of the ash, but the following problems exist.

That is, as shown in Fig. 2, too many bonding surfaces (bonding lines) are generated between the foam tapes 20, resulting in incomplete bonding, voids between the foam tapes 20, There is a problem that not only the impact absorption function of the product is deteriorated due to the formation of voids but also the adhesive surface is easily separated.

On the other hand, Japanese Patent No. 4,351,257 discloses an end fitting member having a rib and an insectproof material.

FIG. Sectional view schematically showing the end fitting member and the insectproof member disclosed in Japanese Patent No. 4,351,257, and Fig. 5 is a view showing breakage of the end fitting member.

4 and 5, a conventional insectproof material has a center hole 61 formed at the center of the foam core 60 and an end fitting member 70 provided at both ends of the foam core 60.

The end fitting member 70 is connected by a connecting member 80. An outer layer 90 is formed on the outer surfaces of the foam core 60 and the end fitting member 70.

The connecting member 80 is provided inside the nipple 71 of the end fitting member 70 and the rib 72 of the end fitting member 70 is configured to be in close contact with both end faces of the foam core 60.

However, U.S.A. The conventional insect proof material disclosed in Japanese Patent No. 4,351,257 has a structure in which the ribs 72 are not in contact with the inside of the foam core 60 but come into contact with both end faces as a foam structure that is not a structure in which the foam sheet is wound, As shown in FIG. 5, there is a problem that the end fitting member 70 is completely broken due to a strong external pressure during a bad weather such as a typhoon.

Domestic Registration No. 10-0939305 Domestic Registration No. 10-0749340 U.S.A. Patent No. 4,351,257

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an insect proof material which does not require cutting operation at both side ends, The reinforcing ribs of the end fitting members are fixed to the inside of the foam core, so that even if the warping members are subjected to a warping force at both ends of the insecting member, And an object of the present invention is to provide a method for manufacturing a step-wise winding-type insectproof material capable of effectively preventing a foaming sheet, and a method for manufacturing the step-wise winding-type insectproof material.

In order to achieve the above-mentioned object, the foam sheet-wrapping type insect repellent material of the present invention is manufactured by sequentially fusing a plurality of foam sheets having gradually smaller widths on the outer circumferential surface and thermally fusing them, and an outer layer surrounding the foam core and the outer surface of the end fitting member, wherein the end fitting member has a center of the foam core, A flange formed on an outer circumferential surface of the connection tube and closely attached to both end faces of the foam core; and a reinforcing member formed on an outer circumferential surface of the connection pipe and fixed to the inside of the foam core Ribs.

The plurality of unit foam sheets are connected to each other in the longitudinal direction of the foam core, and a bonding line is formed at the bonding portion of the unit foam sheet.

The adhesive lines may be staggered with respect to each of the foam sheet layers, i.e., alternately or zigzag.

The foam core may be composed of an inner foam core and an outer foam core wound around the outer peripheral surface of the inner foam core.

A connecting member may be installed at a position connecting the end fitting members located on both sides of the foam core.

Meanwhile, the flange may be composed of an inner flange which is in close contact with both end faces of the foam core, and an outer flange which is connected to the outer connection ring.

The reinforcing rib may have at least one of a square shape, a saw tooth shape, an inclined saw shape, and a hook shape.

Meanwhile, the method for manufacturing a step-wise winding type insectproof material of the present invention comprises the steps of: preparing a plurality of foam sheets in which a plurality of unit foam sheets are bonded and connected in the width direction to gradually decrease the width; Forming an inner foam core by thermally fusing a plurality of the foamed sheets manufactured in the first step, while sequentially winding the foamed sheets on the outer peripheral surface of the hollow shaft; Separating and removing the hollow shaft from the inner foam core; Cutting the inner foam core longitudinally and bisecting the same; Inserting an end fitting member between the two divided inner foam cores; Forming an outer foam core by thermally fusing the plurality of foam sheets on an outer circumferential surface of the inner foam core while sequentially winding the plurality of foam sheets; And forming an outer layer on an outer surface of the outer foam core and the end fitting member.

INDUSTRIAL APPLICABILITY As described above, the present invention eliminates the need for cutting operations at both ends of the insectproof material, and is effective in reducing productivity and productivity.

The present invention also provides a method of forming a foam sheet having a large area by laminating a foam sheet in the form of a foam core in which not only the adhesion line between the foam sheets is minimized but also alternately arranges them to disperse the stress generated in the adhesive line, Insecticide can be produced.

Further, since the reinforcing rib of the end fitting member is fixed to the inside of the foam core, the insectproof material of the present invention prevents the insect proof material from being damaged even when the reinforcing rib is warped at both ends of the insectproof material, .

1A is an exploded perspective view showing a conventional foam sheet retractable insectproof material,
Fig. 1B is a view for explaining the cutting of both end portions in the conventional foam sheet retractable insectproof material
2 is a cross-sectional view showing a conventional foam tape winding type insectproof material
Fig. 3 is a schematic view showing the conventional foamed tape winding type insect repellent material winding device of Fig. 2
4 is a cross-sectional view schematically showing a conventional end fitting member and an insectproof material
5 is a view showing the breakage of the end fitting member
6 is a perspective view showing a foam sheet step-wise winding type insectproof material according to a preferred embodiment of the present invention.
FIG. 7A is a cross-sectional view showing a foam sheet step-wise winding type insectproof material according to a preferred embodiment of the present invention
7B is a cross-sectional view showing the outer layer and the connecting member in the production of the foam sheet-wrapping type insectproof material according to the preferred embodiment of the present invention
8 is a view for explaining the production of step-wise winding type insectproof material according to a preferred embodiment of the present invention;
9 is a perspective view showing the end fitting member
10A is a cross-sectional view showing the reinforcing rib
10B is a cross-sectional view showing another example of the reinforcing rib
Figure 10c is a cross-sectional view of another example reinforcing rib;
11 is a view illustrating a step of manufacturing a step-and-turn wrapping type insectproof material according to a preferred embodiment of the present invention
12 is a block diagram for explaining the production of step-wise winding type insectproof material according to a preferred embodiment of the present invention

Hereinafter, a foaming sheet step-wise insect-proof material according to a preferred embodiment of the present invention and a method for manufacturing the step-wise wound insectproof material of the foam sheet will be described in detail with reference to the accompanying drawings.

FIG. 6 is a perspective view showing a step-up type insectproof material according to a preferred embodiment of the present invention, FIG. 7A is a cross-sectional view of a foam sheet step-wise insectproof material according to a preferred embodiment of the present invention, 8 is a view for explaining the production of a step-wise winding type insectproof material according to a preferred embodiment of the present invention. FIG. 8 is a cross- Fig. 9 is a perspective view showing the end fitting member, Fig. 10A is a cross-sectional view showing the reinforcing rib, Fig. 10B is a cross-sectional view showing another reinforcing rib, and Fig. 10C is a cross-sectional view showing still another reinforcing rib.

The foam sheet step-wise type insectproof material 1000 of the present invention comprises a foam core 100, an end fitting member 200 which is coupled to both sides of the foam core 100, 100 and an outer layer 300 covering and covering the outer surface of the end fitting member 200.

The foam core 100 is manufactured by thermally welding a plurality of foamed sheets 110 having a gradually smaller width on the outer circumferential surface of the foamed core 110 in order, and both ends of the foamed sheet 110 are formed into a stepped tapered shape.

The foam sheet 110 is formed by connecting a plurality of unit foam sheets S in a longitudinal direction of the foam core 100. An adhesive line (L) is formed at the bonding site of the plurality of unit foam sheets (S).

The adhesive lines L may be arranged alternately (alternately) with respect to each foam sheet S layer.

The reason why the adhesive lines L are staggered with respect to each other in the foam sheet (S) layer is to disperse the stress generated in the adhesive line L to provide a more rigid insectproof material.

Each foam sheet 110 may be wound in the same layer for stepped steps formed on both sides of the foam core 100, as well as being heat-welded by one layer, two layers or three layers, desirable. That is, when the first foam sheet is wound in two layers, the next foam sheet can be wound in the same layer as two layers. By doing so, the shape of each step can be kept the same, and the finishing work can be performed more efficiently.

In the case of the insectproof material of the present invention, for example, in the case of manufacturing a comparatively small insectproof material having a width of 1000 mm, a foam sheet having a width of 1000 mm is first used, the angle of the next step is calculated, 970 mm, and 940 mm, it is sufficient to use a foam sheet having a gradually smaller width.

In contrast, in the case of producing insectproof materials having a large width of 6000 mm, it is sufficient to form foam sheets of two types of 1500 mm and 1000 mm. Four foam sheets having a first width of 1,500 mm were formed to have a width of 6000 mm and then five sheets of foam having a width of 1,000 mm were made to have a width. The foam sheet located at both ends of the hollow shaft had a width of 985 mm So that a 15 mm step is formed and wound.

Thereafter, as described above, a foam sheet having a width of 1,500 mm was wound and thermally fused so as to adjust the length for forming the step, and a step was formed at both side ends by using 100 mm which was adjusted in widthwise width again It is preferable that the portions where the widths overlap each other are formed to be shifted from each other.

The foam core 100 may include an inner foam core 100a and an outer foam core 100b wound on the outer peripheral surface of the inner foam core 100a. Herein, the inner foam core 100a refers to a foam core cut into two in order to insert a reinforcing rib, and the outer foam core 100b refers to a foam core wound around the outer peripheral surface of the inner foam core 100a.

The end fitting member 200 corresponds to a shearing force applied in the longitudinal direction of the foam core 100 and serves to connect the outer connection ring A. The center fitting hole A flange 220 formed on an outer circumferential surface of the connection pipe 210 and closely adhered to both end faces of the foam core 100 and an outer periphery of the connection pipe 210; And a reinforcing rib 230 formed on the surface of the foam core 100 and fixed to the inside of the foam core 100.

The flange 220 may include an inner flange 221 which is in close contact with both end faces of the foam core 100 and an outer flange 222 which is connected to the outer joint ring A. [

The reinforcing rib 230 may be formed of at least one of a square shape (see FIG. 9), a sawtooth shape (see FIG. 10A), an oblique sawtooth shape (see FIG. 10B), and a hook shape (see FIG.

The outer layer 300 surrounds the outer surfaces of the foam core 100 and the end fitting member 200 to wind a reinforcing yarn such as glass fiber or nylon fiber around the outer periphery of the foam core 100, The outer layer 300 is formed by applying a urea resin. A reinforcing filament 301 is provided inside the outer layer 300 to prevent the polyurea resin from flowing down when the outer layer 300 is applied and to hold the flange 220, (Not shown).

A connecting member 400 may be installed at a position where the end fitting member 200 located on both sides of the foam core 100 is connected.

FIG. 11 is a view illustrating a process for manufacturing a step-and-turn type insect proof material according to a preferred embodiment of the present invention, and FIG. 12 is a block diagram for explaining manufacturing of a foam sheet step-wise insect proof material according to a preferred embodiment of the present invention.

With reference to the above drawings, a method of manufacturing a foam sheet step-wise type insectproof material of the present invention is a method of manufacturing a foam sheet having a plurality of foam sheets (S) (S10) of winding the foam sheet (110) on the outer peripheral surface of the hollow shaft (10) in order to form the inner foam core (100a); Separating and removing the hollow shaft 10 from the inner foam core 100a (S 20); Cutting the inner foam core (100a) longitudinally and bisecting the same (S30); Inserting (S 40) the end fitting member (200) between the two divided inner foam cores (100a); (S50) of fabricating the outer foam core 100b by thermally fusing the plurality of foam sheets 110 while sequentially winding the plurality of foam sheets 110 on the outer peripheral surface of the inner foam core 100a; And forming an outer layer 300 on an outer surface of the outer foam core 100b and the end fitting member 200 (S60).

In the step (S 10) of manufacturing the inner foam core 100a, a plurality of foam sheets 110 are manufactured in which a plurality of unit foam sheets S are adhered and connected in the width direction to gradually decrease in width. Thereafter, the foam sheet 110 is sequentially wound around the outer circumferential surface of the hollow shaft and thermally fused to produce the inner foam core 100a. The hollow shaft 10 may be any of those used in the production of a conventional insectproof material having a structure in which a flange is formed at both ends of a pipe Pipe and a boss portion is formed at the outside of both flanges.

The inner foam core 100a is manufactured by thermally fusing a plurality of foam sheets 110 having a gradually smaller width on an outer circumferential surface thereof in order and forming both ends of the foam sheet 110 in a stepped taper shape.

A plurality of unit foam sheets S are bonded to the foam sheet 110 in the longitudinal direction of the foam core 100. An adhesive line L is formed at an area where the unit foam sheet S is bonded . The adhesive lines L may be staggered with respect to each foam sheet S, that is, alternately or zigzag.

 Each foam sheet 110 may be wound in the same layer for stepped steps formed on both sides of the foam core 100, as well as being heat-welded by one layer, two layers or three layers, desirable. That is, when the first foam sheet is wound in two layers, the next foam sheet can be similarly wound in two layers. By doing so, the shape of each step can be kept the same and the finishing work can be done more efficiently.

In the step S30 of cutting and separating the inner foam core 100a in the longitudinal direction, the inner foam core 100a is cut in the longitudinal direction by using a cutting device not shown in the figure.

In the step (S40) of inserting the end fitting member 200 between the two divided inner foam cores 100a, the reinforcing rib 230 of the end fitting member 200 is fixed to the inner foam core 100a And the inner flange 221 of the end fitting member 200 is brought into close contact with the both side ends of the inner foam core 100a.

Immediately before the formation of the outer layer, the outer layer 300 is firmly bonded to the surface of the foam core 100 while maintaining a uniform size of the insectproof material through the surface processing step of the foam core 100.

In order to process the surface of the foam core 100, the foam core 100 is placed on a support (not shown) and then rotated using a cutting tool (not shown) while being rotated to have a desired shape and dimensions . The outer surface of the foam core 100 is roughly formed by machining by the cutting tool, and such a rough outer surface strengthens the bonding of the outer layer 300 at the time of forming the outer layer 300.

In step S 70 of forming the outer layer 300, a reinforcing yarn such as glass fiber or nylon fiber is wound around the outer periphery of the foam core 100 and a polyurea resin is applied thereon to form the outer layer 300, . At this time, the polyurea resin may be applied using a filament winding machine. A reinforcing filament 301 is installed inside the outer layer 300 so that the flange 220 is not gripped when the outer layer 300 is applied and the end fitting member 200 is fixed to the foam core 100 .

INDUSTRIAL APPLICABILITY As described above, the present invention eliminates the need for cutting operations at both ends of the insectproof material, and is effective in reducing productivity and productivity.

The present invention also provides a foam sheet having a large area, which is laminated in the form of a foam core, wherein not only the adhesion line between the foam sheets is minimized but also alternately arranges the stress to disperse the stress generated in the adhesive line, The ash can be manufactured.

Further, since the reinforcing ribs of the end fitting members are fixed to the inside of the foam core, even if the both ends of the insectproof material are subjected to a warping force, the reinforcing ribs effectively prevent damage to the insectproof material in response to the warping force, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications and variations are possible within the scope of equivalents. For example, the shape of the reinforcing ribs can be variously modified, and the width, length, and thickness of the foam sheet can be variously modified according to design conditions.

10: Hollow shaft
100: foam core
100a: Inner foam core
100b: Outer foam core
110: foam sheet
200: end fitting member
210: connecting pipe
220: Flange
221: Inner flange
222: Outer flange
230: reinforcing rib
300: Outer layer
301: reinforced filament
A: Outer link
H: Center hole
S: Unit foam sheet

Claims (10)

A foam core having a plurality of foam sheets each having a gradually smaller width on an outer circumferential surface thereof, the foam core being formed by thermally fusing while being sequentially wound, and having both ends formed as tapered tapered shapes; And an outer layer surrounding the outer surface of the foam core and the end fitting member,
Wherein the end fitting member comprises: a connection pipe inserted into a center hole formed at a center of the foam core; a flange formed on an outer circumferential surface of the connection pipe and closely attached to both end faces of the foam core; And a reinforcing rib fixed to the inside of the foam core. The method according to claim 1,
Wherein the foam sheet has a plurality of unit foam sheets adhered to each other in the longitudinal direction of the foam core, and an adhesive line is formed at an adhered portion of the unit foam sheet. The method of claim 2,
Wherein the adhesive lines are staggered with respect to each of the foam sheet layers. The method according to claim 1,
Wherein the foam core comprises an inner foam core and an outer foam core wound around an outer peripheral surface of the inner foam core. The method according to claim 1,
And a connecting member is installed at a position connecting the end fitting members located on both sides of the foam core. A foam core comprising: a foam core having a plurality of foam sheets each having a gradually smaller width on an outer circumferential surface, the foam core being formed by sequentially winding and heat-fusing the foam sheet, the both ends of the foam core being formed into a stepped tapered shape; An end fitting member, and an outer layer surrounding the foam core and the outer surface of the end fitting member. delete delete delete Preparing a plurality of foam sheets in which a plurality of unit foam sheets are bonded in the width direction to gradually decrease the width and then sequentially winding the foam sheet on the outer circumferential surface of the hollow shaft to thermally fuse the foam sheet to produce an inner foam core ;
Separating and removing the hollow shaft from the inner foam core;
Cutting the inner foam core longitudinally and bisecting the same;
Inserting an end fitting member between the two divided inner foam cores;
Forming an outer foam core by thermally fusing the plurality of foam sheets on an outer circumferential surface of the inner foam core while sequentially winding the plurality of foam sheets; And
And forming an outer layer on an outer surface of the outer foam core and the end fitting member.

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