KR20130008897A - Pleasure boat containing rotational molded hull - Google Patents

Abstract

PURPOSE: A pleasure boat including a rotationally molded hull is provided to integrate all kinds of members and parts. CONSTITUTION: A pleasure boat includes a hull. The hull is a rotationally molded product and comprises an inner surface(110) and an outer surface(120). A space between the inner surface and the outer surface is a hollow structure or is filled with plastic foams. The pleasure boat is selected among a classic out power boat, a fishing out power boat, and a party barge out boat.

Description

Pleasure Boat Containing Rotational Molded Hull}

The present invention relates to a plunger boat comprising a rotomolded hull.

Recently, the maritime leisure market in Korea is expected to grow rapidly in the next 10 years due to the increase in per capita income along with the implementation of a five-day workweek as the initial stage of growth. Despite this favorable environment, Korea, which is currently the world's best shipbuilding powerhouse, has a far lower design and manufacturing technology than most developed countries in most marine leisure sports products. In particular, the design of the fishing boat sector, which is the most popular among marine leisure sectors, depends almost on imports, and only production is made in Korea. In particular, the market for boat sales is mainly made up of FRP boats, which are disposed of in developed countries, and the domestic coast has become a used boat dump in developed countries.

Therefore, securing domestic design technology through independent research and development of plunger boats is a shortcut to prevent marine environmental pollution and pioneer blue ocean of small and medium sized shipbuilding companies.

On the other hand, existing researches on yachts and boats are focused on the linear development of reducing the fluid resistance in order to increase the fuel economy of the plunger ship, or the ship structural design using the existing structural design standard is the mainstream.

Pleasure boat or yacht manufacturers have been using FRP, which has a high strength relative to volume, as a hull material to date, but since 2000, regulations on environmental pollution and marine safety on FRP hulls have been tightened. In other words, FRP is non-recyclable and has a very return horn that takes more than 100 years to decompose in nature upon disposal. In addition, when the FRP hull is incompletely laminated, moisture is easily absorbed into the core, which limits the service life of the FRP hull to 15 years in Japan. Therefore, various countries have proposed various materials as an alternative to the FRP hull. Among them, the most representative material is aluminum, which has been standardized in Korea. However, aluminum is too early to be popularized because hull prices are too expensive for plunger ships.

As a general hull material, Korean Society proposes steel, aluminum, FRP, and accordingly structural design specification and material design strength. However, research on cheap materials suitable for small ships has not been conducted at all, and only the small shipbuilding industry manufactures canoes or kayak hulls using polyethylene.

It is therefore an object of the present invention to provide a plunger boat comprising a plastic hull manufactured by rotational molding.

It is also an object of the present invention to provide a plunger boat comprising a reinforced plastic hull.

It is also an object of the present invention to provide various types of plunger boats to which deck decks are joined.

In order to achieve the above object, the present invention provides a plunger boat comprising a plastic hull using a rotational molding method.

Specifically, the plunger boat of the present invention is a plastic molded part, and consists of an inner surface and an outer surface, and the inner surface and the outer surface include a hollow structure or a hull filled with plastic foam. The hull, which is a plastic rotomolded product of the present invention, can be recycled.

The kind of the plunger boat is not particularly limited and may be a classic out power boat, a fishing out power boat, a party pants out boat, or the like.

Plastic foam (foam) between the inner surface and the outer surface of the hull may be a urethane foam, but is not limited thereto.

The product material is not particularly limited, and various materials of thermoplastic engineering plastics such as polyethylene, crosslinked polyethylene, polypropylene, polyimide, polycarbonate, nylon, and fluororesin may be used.

The inner and outer surfaces of the hull may be single-layer or multi-layer plastic rotomolded articles, respectively.

For strengthening the hull, bending / unevenness may be formed on the inner surface, or may be rotomolded while the nut is integrated. Alternatively, the strength reinforcing frame may be integrally included between the inner surface and the outer surface. Alternatively, longitudinal and / or transverse ribs may be further formed on top of the inner surface.

If necessary, a functional coating layer may be formed on the outer surface of the hull.

In one embodiment, the plunger boat of the present invention may further include a deck deck. The deck material is made of a material selected from wood, non-ferrous metals, synthetic resin, and can be combined with the plastic hull through the non-ferrous metals.

The deck and hull fastening method of the deck material is not particularly limited and may be a mechanical fastening method using a bolt, rivet and nut, drilling, molding and the like.

Pleasure boat of the present invention is light and recyclable by using a plastic material, can be molded in a complex form, can integrate various members, parts and the like, there is an advantage that can implement a variety of designs free of coloring.

Further, in the case of the conventional FRP hull, the deformation of the hull due to incomplete hardening and water absorption into the material progresses, whereas the plastic hull of the rotomolded product of the present invention generates deformation over time due to sufficient cooling in the mold. This does not have the advantage that the dimensional change of the boat is small.

In addition, the plunger boat of the present invention can be automated because the production process system can be built in a stable production system to reduce the dependency on the manpower has the advantage of high volume production and high productivity.

1 is a perspective cross-sectional view of a hull in a flexure boat according to a first embodiment of the present invention;
2A is a perspective cross-sectional view of a hull in a plunger boat according to a second embodiment of the present invention;
2a is a plan view of a hull in a plunger boat according to a second embodiment of the present invention;
3A is a perspective view of a hull in a flexure boat according to a third embodiment of the present invention;
3A is a perspective cross-sectional view and a partially enlarged view of a hull in a plunger boat according to a fourth embodiment of the present invention;

To illustrate the present invention, it is understood that various forms are shown in the drawings as preferred embodiments, but it is understood that the invention is not limited to the specific examples shown. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 is a cross-sectional view schematically showing the hull of the plunger boat according to the first embodiment of the present invention.

Referring to FIG. 1, the plunger boat of the present invention is a rotational molded product of plastic, and includes an inner surface 110 and an outer surface 120, and between the inner surface and the outer surface 130 is a hollow structure or a plastic foam ( foam) and the hull 100 is filled.

In the present invention, a pleasure boat refers to a ship having a hull length of less than 24 m as a ship used for sports or recreational purposes other than passenger ships, wire lines, ferries, and fishing vessels. In general, the industry uses plunger boats in combination with recreational boats or recreational boats.

Pleasure boats of the present invention include both sailing boats, leisure yachts, power boats, and fishing boats, depending on the application. In one example, the plunger boat may be selected from among classic out powerboats, fishing out powerboats and party pants outboats, but is not limited thereto.

The plunger boat of the present invention includes a plastic hull 100 that is a rotomolded product, and has an advantage of being easy to recycle and eco-friendly and recovering raw material costs. In addition, the plastic is deformed by an external impact, not only absorbs the impact, but also has the advantage of being restored when the external force is removed.

In the present invention, the plastic hull has a hollow structure or a foam-filled structure capable of acting as a buffer so that the advantages of shock absorption and recovery can be exhibited. The plastic foam is not particularly limited and may be formed by reacting a glycol with a isocyanate compound, which may be, for example, urethane foam.

The product raw material is not particularly limited, and various materials of thermoplastic engineering plastics such as polyethylene, crosslinked polyethylene, polypropylene, polyimide, polycarbonate, polyvinyl chloride, nylon, and fluororesin may be used. In one embodiment of the invention polyethylene is used. Polyethylene is not harmful to the human body because of its long life and good hygiene because it is not eroded or corroded by sea water. It is a material that has sufficient buoyancy to float in water due to its low specific gravity. If these properties are applied to make a polyethylene vessel, the vessel can float on water naturally. However, commercial ships with long hull lengths are exposed to harsh use environments, making them unsuitable for making hulls from ductile polyethylene, but for shorter hull lengthened plunger boats, the mechanical properties are very advantageous for design. In other words, even if the polyethylene hull is damaged, the hull structure can float on water, so the hull structure can be rescued in an urgent situation, so that the hull accident can be coped quickly. In addition, the polyethylene hull has a chemical stability that does not react with water at all, and does not require a separate hull coating, and a low maintenance cost is required due to the high fuel efficiency of the boat due to the light weight hull. Can be. In the case of polyethylene, high profits are generated when the ship is dismantled, which not only recovers the initial purchase cost but also contributes to preventing marine pollution.

The thickness of the inner surface 110 and the outer surface 120 is not particularly limited, but according to an embodiment of the present invention, when the thickness of the polyethylene hull is 12 mm, low stress is maintained, while each part of the hull is 15 mm or more. Local stresses occurred in the hull due to stress concentration in the liver. Accordingly, the thicknesses of the inner surface 110 and the outer surface 120 may be 15 mm or less, respectively.

If necessary, various materials such as metal, glass, and plastic are inserted into the hull to enhance strength, or to engrave the manufacturer's logo, name and product specifications, or to add a pattern to the outer surface of the hull.

Plastic hull, which is a rotomolded body in the present invention, may need to reinforce mechanical strength and impact strength.

In one embodiment, the inner surface of the hull may be formed to form a bent / uneven portion to reinforce the strength. Referring to FIG. 2A in which a schematic diagram of a hull according to a second embodiment of the present invention is shown, a bent portion or uneven portion 111 is formed on an upper surface of the hull 101. This can be easily achieved by forming the bent / uneven portion 111 corresponding to the desired shape in the mold corresponding to the upper surface of the hull during rotational molding. In the case of the rotational molding method, molded articles of various complicated shapes can also be simply manufactured by manufacturing a mold. As shown in FIG. 2B, when the bent / uneven portion 111 is formed in a lattice pattern or a checkered pattern, an area of plastic per unit volume increases, which may bring about an effect of strength reinforcement. A rib 300 in the longitudinal and / or transverse direction may be further formed on the inner surface.

According to another embodiment, as shown in Figure 3a, which is a cross-sectional view of the plastic hull of the third embodiment of the present invention, a plurality of metal inserts 140, such as washer nuts, may be integrated on the inner surface of the hull 102. Referring to FIG. 3B, which illustrates a structure in which the metal insert 140 is formed on the hull 101 having the flexure / convex portion 111 formed in the fourth embodiment, a plurality of separately manufactured angled frames 201, 202, 203, and 204 are provided. ) May be fixed to the metal insert 140 through bolting or drilling on the upper surface of the hull. Since the metal insert 140 is integrally formed through rotational molding, the fastening strength is significantly higher than when the nut or the like is bonded to the plastic hull with an adhesive or the like. If necessary, the ribs 400 may be introduced into the lower portion of the plastic hull. For example, the ribs 400 may be introduced by fusion, with a double-layered pipe made of an inner layer of SUS steel and an outer layer of PE.

According to another embodiment, the strength reinforcing frame may be integrally formed between the inner surface and the outer surface. Specifically, after attaching a frame for strength reinforcement in the mold and then inserting the powder raw material into the mold and rotating molding, the frame may be integrated and manufactured in a plastic hull. The frame may be, for example, a frame in the form of a rib, such as a steel pipe, or a frame in the form of a mesh reinforcement. Such a frame may be manufactured in an integrated form by inserting a frame into a mold in a rotational molding process and performing rotational molding, or through compression molding process in which a hull is first manufactured through rotational molding and then a frame is placed and pressure is applied. It can also be coupled to the hull.

In another embodiment, the outer surface of the hull, for example, anti-corrosion coating, waterproof coating, fireproof coating and the like may be formed of a functional coating layer.

According to another embodiment of the present invention there is provided a plunger boat further comprising a deck of deck material. The deck material is made of a material selected from wood, non-ferrous metals, synthetic resin, and can be combined with the plastic hull through the non-ferrous metals.

As a method of joining the plastic hull to a deck made of various release deck materials such as wood, nonferrous metal, and synthetic resin, for example, an aluminum molding, a mechanical fastening method using bolts or rivets, and the like may be used.

While the present invention has been described with reference to the specific embodiments thereof, it is to be understood that the invention is not limited thereto. Those skilled in the art can change or modify the embodiments described without departing from the scope of the present invention, and such changes or modifications are within the scope of the present invention. In addition, the materials of each component described herein can be readily selected and substituted for various materials known to those skilled in the art. Those skilled in the art will also appreciate that some of the components described herein can be omitted without degrading performance or adding components to improve performance. In addition, those skilled in the art may change the order of the method steps described herein depending on the process environment or equipment. Therefore, the scope of the present invention should be determined not by the embodiments described, but by the claims and their equivalents.

Claims (10)

A rotary molded article of plastic, comprising an inner surface and an outer surface, wherein the inner surface and the outer surface comprise a hollow structure or a hull filled with plastic foam.
The method of claim 1,
The plunger boat is selected from a classic out powerboat, a fishing out powerboat, a party pants outboat.
The method of claim 1,
Pleasure boat, characterized in that the urethane foam is filled between the inner surface and the outer surface.
The method of claim 1,
And the inner and outer surfaces are single-layer or multi-layer plastic rotomolds, respectively.

The method of claim 1,
Flexure boat, characterized in that the inner surface is formed with a bent / irregularities.
The method of claim 1,
And the inner surface is rotomolded with an integrated metal insert.
The method of claim 1,
A strength boat is integrally included between the inner surface and the outer surface, the plunger boat.
The method of claim 1,
Pleat boat, characterized in that the ribs in the longitudinal and / or transverse direction is further formed on top of the inner surface.
The method of claim 1,
The decker boat further comprising a deck deck.
10. The method of claim 9,
The deck material is made of a material selected from wood, non-ferrous metals, synthetic resin, characterized in that coupled to the plastic hull through a non-ferrous metal, plunger boat.

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