KR20090065490A - The tube for a rubber boat with a built-in stuffing foam and the making method thereof - Google Patents

Abstract

A solid filling type tube for a rubber boat and a manufacturing method thereof are provided to increase the surface strength of the tube by coating the same with poly urea resin having high strength, high elasticity, and high abrasion resistance, thereby preventing the tube from strong impact. A solid filling type tube for a rubber boat includes a plurality of unit filling foams(4), an inside filler(5), upper and lower claddings(6,7), and a solid filling type tube. The unit filling foams are formed in the cylindrical shape by compressing foamed polyethylene or foamed polyurethane under high density. The unit filling foams are connected in serial by thermal fusion or adhesive to form the inside filler in the "O" or "U" shape entirely in the plane view. The unit filling foams surrounds the outer periphery of an upper hull of the rubber boat entirely or except rear side. The upper and lower claddings are formed of poly urea resin in the shape matching with upper and lower outer surfaces of the inner filler respectively. The upper and lower claddings are doped with urethane adhesive on inner surfaces by a uniform thickness and attached to the upper and lower outer surfaces of the inner filler respectively.

Description

The tube for a rubber boat with a built-in stuffing foam and the making method

The present invention is a tube of rubber boats used for marine training and lifesaving or lifesaving in various kinds of marine police, military units, etc., filled with polyethylene foam or polyurethane foam compressed at high density inside and having high strength, high elasticity and wear resistance outside. The present invention relates to a solid-filled tube for a rubber boat coated with a polyurea resin and a method for manufacturing the same. More particularly, the rubber is installed on the outer circumferential surface of a hull of a rubber boat that provides a user's boarding space. In the boat tube, a unit filling foam manufacturing step of manufacturing a unit filling foam by molding into a cylindrical shape while compressing the expanded polyethylene or expanded polyurethane to have a density of 0.02 ~ 0.5g / cm3, heat-sealing the unit filled foam Alternatively, a plurality of adhesives may be attached and attached, but the entire outer circumferential surface of the hull or the rear of the rubber boat The inner filling material forming step of forming an inner filling material having an "O" shape or an "U" shape when viewed in plan view by attaching and connecting the shape so as to surround the upper outer circumferential surface of the upper outer surface, wherein the plurality of unit filling foams are formed. A coating manufacturing step of manufacturing a top coating and a bottom coating having a thickness of 1 to 50 mm made of a polyurea resin having high strength, high elasticity, and abrasion resistance in a shape corresponding to the shapes of the upper outer peripheral surface and the lower outer peripheral surface of the inner filler, the upper coating and the lower coating A rubber boat solid, which is manufactured through a tube completion step of applying a urethane adhesive to the inner circumferential surface of the coating to a thickness of 1 to 5 mm and attaching the upper outer circumferential surface and the lower outer circumferential surface of the inner filler to complete a solid filling tube. It relates to a packed tube and a method of manufacturing the same.

In general, the rubber boat (2 ') used for marine training and lifesaving or various leisure in marine police or military units, as shown in Figure 5 is generally light and high strength glass fiber reinforced plastic (FRP), etc. It is made of synthetic plastic material or wood of the hull (3 ') for providing a boarding space for the user to board, and is attached to the upper outer peripheral surface of the hull (3') is installed by the air (air) filled inside It is composed of a tube (1 ') to inflate the hull (3') on the water while inflated, the hull (3 ') and the tube (1') is fixedly attached or detached using a conventional rubber adhesive or the like. The hull 3 'and the tube 1' are coupled to each other in an up and down manner by being fastened with bolts and nuts.

However, the conventional rubber boat 2 'is constructed in such a way that the air is filled in the inside of the tube 1' so that it may be damaged or sharply damaged by friction or contact with the outside during storage, transportation and use. Frequent damage occurs, such as tearing easily due to contact of the air, and there is a problem of air leaking into the damaged part. Especially, when the tube (1 ') is used by a knife or a gun when used in a marine police or a military, which frequently causes a strong event, As the air injected into the inside is easily discharged in an instant, the rubber boat 2 'is sunk and the safety of the rider is greatly threatened.

The present invention is to solve the above problems to form a tube of a rubber boat in a solid filling type, not air-filled, but the inside of the tube is filled with high-density compressed polyethylene foam or polyurethane foam and the outside is high strength, high elasticity It is coated with polyurea resin with abrasion resistance, so the surface strength is greatly increased so that the tube does not get damaged even from the strong impact from the outside by sharp weapons such as knives when used in marine police or military. The purpose of this is to prevent the rubber boat from sinking in water by maintaining the shape of the tube without the inner filler filling inside the tube even when the hole is bent.

In order to achieve the above object, a rubber boat tube is installed on the outer circumferential surface of the upper part of the hull of the rubber boat that provides the user's boarding space, and the foamed polyethylene or the foamed polyurethane is 0.02 to 0.5 g / cm3. A unit filling foam manufacturing step of manufacturing a unit filling foam by molding into a cylindrical shape while compressing to have a density, and attaching a plurality of unit filling foams by thermal fusion or adhesive, except for the entire outer circumferential surface of the hull or the rear of the rubber boat. An inner filler forming step of forming an inner filler by connecting and attaching to a shape corresponding to the upper outer circumferential surface, and having a high strength and high elasticity in a shape corresponding to the shape of the upper outer circumferential surface and the lower outer circumferential surface of the inner filler made of the plurality of unit filling foams, respectively. Wear resistant polyurea resin with a thickness of 1 to 50 mm Coating manufacturing step of manufacturing the volume coating and the lower coating, the urethane adhesive is applied to the inner peripheral surface of the upper coating and the lower coating with a thickness of 1 ~ 5mm, respectively, attached to the upper outer peripheral surface and the lower outer peripheral surface of the inner filler to complete the solid filling tube It is a feature of the present invention to be manufactured through a tube completion step.

As described above, according to the present invention, the tube of the rubber boat is formed by solid filling rather than air filling, but the inside of the tube is filled with high density polyethylene foam or polyurethane foam, and the outside has high strength, high elasticity, and abrasion resistance. Since it is coated with urea resin, the surface strength is greatly increased, so it can be used safely for a long time without damage to the tube even from the strong impact from the outside by sharp weapon such as knife when used in marine police or military. Even when the hole is bent, the inner filling material inside the tube does not escape to the outside, so the shape of the tube is maintained as it is, so that the rubber boat does not sink underwater, thereby preventing safety accidents.

Solid-filled tube (1) for the rubber boat according to the present invention is the user of the rubber boat (2) used for marine training and lifesaving or various leisure in marine police or military units as shown in Figures 1 to 4 It is installed on the upper outer circumferential surface of the hull (3) to provide a boarding space, the hull (3) to rise above the water surface, the unit filling foam manufacturing step, the internal filling material forming step, coating manufacturing step, tube completion step inside Filled with polyethylene foam or polyurethane foam compressed to high density, and coated with Polyurea resin with high strength, high elasticity, and abrasion resistance on the outside, so that the overall surface strength is significantly increased. Are manufactured.

Hereinafter, each manufacturing step of the solid-filled tube according to the present invention will be described in detail by the accompanying drawings.

1. Unit filling foam manufacturing stage

Compressing a conventional foamed polyethylene or foamed polyurethane (foamed polyurethane) to have a constant density to produce a short cylindrical unit filling foam (4), to maintain a constant buoyancy to float on the water surface While compressing a conventional foamed polyethylene foam or foamed polyurethane foam to have a density of 0.02 to 0.5g / cm 3 by compression molding in a short cylindrical shape to prepare a plurality of unit filling foam (4).

Compression molded unit filling foam (4) is about 40 ~ 70cm in diameter, the length is formed into a short cylindrical shape of about 1 ~ 20cm, excellent heat resistance, water absorption, wear resistance, corrosion resistance, tensile strength The tensile strength is about 5 to 20 N / ㎠, the internal tearing strength is 12 to 15 N / cm, and the compressive hardness is 2.5 to 4.0 N / ㎠. The rubber boat 2 is not only stably floated on the surface of the water in the state filled with the inside of the tube 1, and is not easily damaged even when an external force is applied.

In addition, the compression-molded unit filling foam (4) has a water absorption rate of 0.0002 ~ 0.0005g / cm3, so that even if the surface of the tube (1) is damaged and water penetrates inside, the rubber is hardly absorbed. The boat 2 does not sink easily.

2. Internal filling reforming stage

Attaching the unit filling foam (4) dozens to hundreds to form the inner filler (5) of the shape corresponding to the outer peripheral surface of the upper hull (3) of the rubber boat (2), as shown in FIG. As described above, when the unit filling foam (4) is attached to a plurality of lines in a row while wrapping the upper outer peripheral surface except the entire upper or outer peripheral surface of the hull (3) to form an inner filler (5) having a shape corresponding thereto, As shown on both sides of the hull (3), a straight portion connects and attaches a plurality of unit filling foams (4) in a row, and a rounded portion, such as the front edge portion of the hull (3), connects the plurality of unit filling foams (4) thereto. The connection and attachment of the corresponding rounded shape forms an inner filler 5 having a shape that conforms to the upper circumferential surface of the hull 3 in the shape of an "O" or "U" in plan view.

One side or both sides to which the plurality of unit filling foams 4 are attached to each other is attached by a conventional heat fusion method or connected by an adhesive, in the case of attaching by the heat fusion method of the unit filling foam (4) When one side of the unit filling foam (4) made of foamed polyethylene or foamed polyurethane is melted by heating one side in a conventional heating furnace heated to about 70 to 150 ° C., the other unit filling foam (4) Attaching the other side and attaching and attaching a plurality of unit filling foams (4) in a manner of cooling at room temperature in turn, when the adhesive is attached using the adhesive of the unit filling foam (4) made of foamed polyethylene or foamed polyurethane Urethane adhesives and the like conforming to physical properties are applied to one side of the unit filling foam (4) with a thickness of about 1 ~ 5mm to be continuously attached.

3. Coating manufacturing step

1 to 50 mm thick polyurea material having a high strength and high elasticity in a shape corresponding to the shape of the upper outer circumferential surface and the lower outer circumferential surface of the inner filling material 5 to which the plurality of unit filling foams 4 are connected in a predetermined shape. The upper coating 6 and the lower coating (7) is a step of manufacturing.

The polyurea resin has the properties of an elastomer (elastomer) and has a high tensile strength and is very elastic, so that it is excellent in resilience, toughness and hard to be returned to its original shape when deformed, and has excellent wear resistance and excellent water resistance and chemical resistance. As an elastomer, it is a room temperature hardening type polyurea binder produced by reacting a main material made of aliphatic isocyanate prepolymer or the like with a curing agent made of an amine terminated polyol polyamine or the like.

Injecting and curing the polyurea resin to a thickness of about 1 to 50 mm by a spraying method on an inner circumferential surface of a forming mold (not shown) manufactured in the same manner as the upper outer circumferential surface of the inner filler 5, and then demolded to form an upper coating ( 6) and sprayed and cured the polyurea resin to a thickness of about 1 ~ 50mm by the spray method on the inner peripheral surface of the molding die (not shown) manufactured in the same manner as the lower outer peripheral surface shape of the inner filler (5) Next, demolding to produce the lower coating (7), the upper coating (6) and the lower coating (7) prepared as described above has a tensile strength of 12 ~ 36kgf / ㎠, elongation of 312 ~ 350% and tear strength It exhibited 700 to 725 N / cm, which was very suitable for application to the present invention.

On the other hand, the polyurea resin used in the present invention used a DU-300 product of Durachemy, Korea.

4. Tube completion step

As shown in FIG. 3, a urethane adhesive or the like is applied on the inner circumferential surfaces of the upper coating 6 and the lower coating 7 prepared in the coating manufacturing step to a thickness of about 1 to 5 mm, respectively. Attached to the upper outer peripheral surface and the lower outer peripheral surface respectively to complete the solid-filled tube (1).

The solid-filled tube 1 completed as described above is a conventional hull made of synthetic plastic material or wood, such as glass fiber reinforced plastic (FRP), which is typically light and has high strength, as shown in FIGS. 1 and 4. (3) Inner and outer surfaces of the hull (3) and tube (1) to be fixed to the upper and lower body integrally by using an adhesive such as urethane adhesive on the upper outer peripheral surface or to be detachable to the hull (3) and the tube (1) Each of the conventional fastening ring (not shown) is fixed to the bolt and nut, etc., and the hull 3 and the tube 1 are detachably coupled to each other so that the rubber boat 2 is assembled and completed.

Hereinafter, the embodiment according to the present invention is as follows.

<Example>

A plurality of unit filling foams (4) are prepared by molding a foamed polyethylene or a polyurethane foam into a cylindrical shape having a diameter of 40 cm and a length of 5 cm while compressing to have a density of 0.05 g / cm &lt; 3 &gt; Attached using urethane adhesive, but attached in a shape corresponding to it so as to surround the upper circumferential surface of the rubber boat (2) except the rear of the hull (3), the internal filling of the "U" shape when the overall shape is viewed in a plane ( 5) and a top coating 6 and a bottom coating having a thickness of 20 mm made of polyurea resin in a shape corresponding to an upper outer circumferential surface and a lower outer circumferential surface of the inner filler 5 including the plurality of unit filling foams 4. 7) respectively, and the urethane adhesive to the inner circumferential surface of the upper coating (6) and the lower coating (7), respectively, 2mm thick and attached to the upper outer peripheral surface and lower outer peripheral surface of the inner filler (5), respectively. The solid-filled tubing (1) was finished.

The surface hardness of the tube 1, which was completed as described above, was measured five times in a state where the surface of the tube 1 was broken by using a conventional strength measuring device. According to the present invention, the surface hardness of the tube 1 has an average value of 155.4 kgf / cm 2, but in the case of a conventional commercial tube filled with air having a thickness of 20 mm, the surface hardness is 15.3 kgf / cm 2. The surface hardness of the tube 1 is about 10 times more robust, so that even when a strong impact from the outside by a sharp weapon such as a knife does not damage the tube 1, it can be used safely for a long time.

In addition, the tube 1 according to the present invention, the upper coating 6 and the lower coating 7 surrounding the outer circumferential surface is integrally attached to the inner filler 5, the upper coating 6 and the lower coating 7 and the inner filler (5) The gap between them does not open or seep water between them, and the inside is solid-filled, so even when the hole in the tube 1 is bent, the inner filler 5 inside the tube 1 is moved to the outside. The tube 1 is maintained without leaving the rubber boat 2 so as not to sink into the water to prevent safety accidents.

1 is a perspective schematic view of a rubber boat assembled using a solid-filled tube for a rubber boat according to the present invention

Figure 2 is a perspective schematic view of a state of forming an internal filler by attaching and attaching a plurality of unit filling foam in a solid filling tube for a rubber boat according to the invention

Figure 3 is a schematic perspective view of a state in which the upper coating and the lower coating on the upper outer peripheral surface and the lower outer peripheral surface of the inner filler in the solid filling tube for rubber boats according to the present invention

Figure 4 is a schematic perspective view of a state in which the solid hull type tube for a rubber boat and a conventional hull up and down according to the present invention

5 is a perspective schematic view of a conventional rubber boat

<Description of Symbols for Major Parts of Drawings>

1, 1 '. tube

2, 2 '. Rubber Boat

3, 3 '. hull

4. Unit filling foam

5. Internal filler

6. Upper cover

7. Lower cover

Claims (4)

In a rubber boat tube installed on the outer circumferential surface of the upper portion of the rubber boat to float the hull on the surface of the rubber boat, unit filling forming the unit filling foam (4) by molding in a cylindrical shape while compressing the foamed polyethylene or polyurethane foam at a high density Foam manufacturing step, the unit filling foam (4) is attached to a plurality of heat-sealing or adhesive bonding to the shape so as to surround the upper outer peripheral surface except the entire upper or outer peripheral surface of the hull (3) of the rubber boat (2) An internal filler forming step of forming an internal filler 5 having an "O" shape or an "U" shape when the overall shape is connected in plan view, the internal filler 5 consisting of the plurality of unit filling foams 4. Fabrication of manufacturing the upper coating 6 and the lower coating 7 of a certain thickness of polyurea resin in a shape corresponding to the shape of the upper outer peripheral surface and the lower outer peripheral surface of the Step, the urethane adhesive is applied to the inner circumferential surface of the upper coating (6) and the lower coating (7) to a certain thickness, respectively, and attached to the upper outer circumferential surface and the lower outer circumferential surface of the inner filler (5) respectively solid filling tube (1) Solid-filled tube for a rubber boat, characterized in that produced through the tube completion step to complete. The method of claim 1, wherein the unit filled foam (4) is a compressed polyethylene foam or foamed polyurethane foam to have a density of 0.02 ~ 0.5g / ㎠ and has a diameter of 40 ~ 70cm and a length of 1 ~ 20cm Solid-filled tube for rubber boats, characterized in that formed into a short cylindrical shape. According to claim 1, wherein the upper coating (6) and the lower coating (7) is 1 ~ 50mm thickness, tensile strength 12 ~ 36kgf / ㎠, elongation is 312 ~ 350% and tear strength 700 ~ 725N / Solid-filled tube for rubber boats, characterized in that the cm. In the manufacturing method of the rubber boat tube which is installed on the outer circumferential surface of the upper portion of the rubber boat to float the hull on the water surface, 40 to 70cm in diameter while compressing the foamed polyethylene or foamed polyurethane to have a density of 0.02 ~ 0.5g / ㎠ Unit molding foam manufacturing step of manufacturing a unit filling foam (4) by molding into a short cylindrical shape of length 1 ~ 20cm, a plurality of the unit filling foam (4) attached by heat fusion or urethane adhesive, but the rubber boat ( Hull (3) of the 2) the inner filler (5) in the shape of "O" or "U" when the overall shape is attached and attached in a shape corresponding to it so as to surround the entire upper outer peripheral surface or the upper outer peripheral surface except the rear (5) Forming the inner filling material forming step, the polywoo in a shape corresponding to the shape of the upper outer peripheral surface and the lower outer peripheral surface of the inner filling material (5) consisting of a plurality of unit filling foam (4) The coating manufacturing step of manufacturing the upper coating 6 and the lower coating 7 having a thickness of 1 to 50 mm made of a resin, and the urethane adhesive on the inner circumferential surfaces of the upper coating 6 and the lower coating 7, respectively, 1 to 5 mm thick. Applied to and attached to the upper outer peripheral surface and the lower outer peripheral surface of the inner filling material (5), respectively, a method of manufacturing a solid filling tube for rubber boats, characterized in that the tube was completed through the step of completing the filling tube (1) .

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