KR102711419B1 - mould for manufacturing polyethylene ship and manufacturing method of polyethylene ship - Google Patents

Abstract

In order to improve productivity and manufacturing precision, the present invention provides a method for manufacturing a polyethylene ship, comprising: a first step in which a carbon mesh made of a carbon material having a plurality of perforated holes formed therethrough is disposed inside a heating chamber, a polyethylene plate made of a polyethylene material is disposed on an upper surface of the carbon mesh, and the polyethylene plate is melted as the interior of the heating chamber is heated to a melting temperature of the polyethylene; a second step in which the carbon mesh and the molten polyethylene plate are disposed on the upper portion of a mold body of a mold device for manufacturing a polyethylene ship, the mold device for manufacturing a polyethylene ship being formed with a cross-sectional outline corresponding to a hull to be manufactured and extending in the longitudinal direction, and the carbon mesh and the molten polyethylene plate are vacuum-absorbed and deformed corresponding to the surface outline of the mold body through a vacuum suction groove formed recessed in the surface of the mold body so as to provide a vacuum suction force; and a third step in which the polyethylene plate is cooled and hardened and is released from the mold body, thereby manufacturing a polyethylene hull.

Description

Mold device for manufacturing polyethylene ship and manufacturing method of polyethylene ship

The invention relates to a mold device for manufacturing a polyethylene ship and a method for manufacturing a polyethylene ship, and more specifically, to a mold device for manufacturing a polyethylene ship and a method for manufacturing a polyethylene ship, which have improved productivity and manufacturing precision.

In general, high-density polyethylene (HDPE, hereinafter referred to as 'polyethylene') is a thermoplastic general-purpose resin. Here, polyethylene is largely divided into two types: low-density polyethylene with a low crystallinity and high-density polyethylene with a high crystallinity, depending on the pressurized conditions during manufacturing.

These polyethylenes have excellent mechanical properties, moisture resistance, moisture-proofing, cold resistance, chemical resistance, and electrical insulation, and are excellent in formability and low in manufacturing cost, so they are used in large quantities for various containers, packaging materials, pipes, household goods, textiles, and wire coverings.

Meanwhile, advanced countries overseas are conducting research and development to build ships using polyethylene, which can solve the shortcomings of aluminum fishing boats, such as the weaknesses of non-recyclable fiber-reinforced plastics and the weaknesses of ship prices and maintenance. In Korea, the Korea Maritime Safety Authority is conducting research to establish safety regulations related to the manufacturing of polyethylene ships in the future.

Here, in the case of polyethylene ships, the hull material can be recycled when scrapped, and compared to aluminum ships, the ship price is expected to be lower and the risk of hull damage due to collision with reefs or other ships is expected to be significantly lower.

Here, the hull of a polyethylene ship was manufactured by processing and unfolding the plate material to express the streamlined shape and angular shape of the hull, and then welding each joint to join them.

In detail, the conventional polyethylene ship manufacturing method was to manufacture a structural member having a skeleton corresponding to the shape of the hull to be manufactured by welding, and then arranging a plurality of polyethylene plates along the outer surface of the structural member and welding them together.

However, the conventional polyethylene ship manufacturing method has the problem that it takes time and money to manufacture a one-time jig, such as structural members corresponding to the shape of the hull to be manufactured, which is required to create a streamlined and angular hull shape, and the more complex the shape, the more time is required for welding.

Furthermore, in the case of metal welding, post-processing is possible immediately after tag welding to establish the basic shape, but in the case of polyethylene, there was a problem that a jig was additionally needed to maintain the shape because of the problem of having to wait until the tagging process cools and hardens after welding due to heat. In particular, the conventional polyethylene ship manufacturing method had a great problem that it was difficult to express abrupt streamlined and angular shapes using the welding method.

In addition, the conventional polyethylene ship manufacturing method had the problem of reduced workability as the number of welding points, which are key to quality reliability, increased, and the number of quality control points that had to be managed to ensure watertightness and precision of the hull also increased.

Korean Patent No. 10-2238643

In order to solve the above problems, the present invention aims to provide a mold device for manufacturing a polyethylene ship and a method for manufacturing a polyethylene ship, which improve productivity and manufacturing precision.

In order to solve the above problem, the present invention provides a method for manufacturing a polyethylene ship, including a first step in which a carbon mesh made of a carbon material having a plurality of perforated holes formed therethrough is arranged inside a heating chamber, a polyethylene plate made of a polyethylene material is arranged on an upper surface of the carbon mesh, and the polyethylene plate is melted as the inside of the heating chamber is heated to a melting temperature of the polyethylene; a second step in which the carbon mesh and the molten polyethylene plate are arranged on the upper portion of a mold body of a mold device for manufacturing a polyethylene ship, the mold device for manufacturing a polyethylene ship being formed with a cross-sectional outline corresponding to a hull to be manufactured and extending in the longitudinal direction, and the carbon mesh and the molten polyethylene plate are vacuum-absorbed and deformed corresponding to the surface outline of the mold body through a vacuum suction groove formed recessed in the surface of the mold body so as to provide a vacuum suction force; and a third step in which the polyethylene plate is cooled and hardened and is released from the mold body, thereby manufacturing a polyethylene hull.

In addition, the present invention provides a mold device for manufacturing a polyethylene ship, including a mold body having a plurality of vacuum suction grooves formed in a cross-sectional outline corresponding to a hull to be manufactured and extending in the longitudinal direction, and extending and sinking in the longitudinal direction at each curved area corresponding to the hull to be manufactured on the surface, and a plurality of suction channels formed in the vacuum suction grooves at equal intervals in the longitudinal direction, each end of which is connected to the inside and penetrates therein; and a vacuum suction means individually connected to the other end of each of the suction channels.

Through the above solution, the present invention provides the following effects.

First, through the means for solving the problem of the ship to be manufactured, the present invention provides the following effects.

First, the molten polyethylene sheet and carbon mesh are vacuum-absorbed onto the surface of the mold body by a plurality of vacuum suction grooves sunken into each curved area of the surface of the mold body corresponding to the hull to be manufactured, and are hardened in a state of mold-fitting and sealing even in the curved areas, so that a high-precision polyethylene hull can be quickly produced.

Second, since the opening of each vacuum suction groove is covered by a carbon mesh having perforations formed between the polyethylene plate and the mold body when the molten deformed polyethylene plate is in close contact with the surface of the mold body, local inflow of the molten deformed polyethylene plate into the vacuum suction groove is blocked while the close contact is strongly maintained, so that manufacturing precision can be improved.

Third, vacuum pressure is sequentially formed along both sides of the mold body from the center in the width direction in each of the mutually spaced vacuum suction grooves, and the molten polyethylene plate and carbon mesh are completely adhered to the surface of the mold body without distortion, so that manufacturing precision can be significantly improved.

Fourth, since the molten polyethylene plate is placed on the upper surface of the carbon mesh, and the carbon mesh is placed together with the molten polyethylene plate on the upper part of the mold body of the mold device for manufacturing polyethylene ships, the molten polyethylene plate can be easily transported without falling off or losing, so that the convenience of work can be significantly improved.

Figure 1 is a flow chart showing a method for manufacturing a polyethylene vessel according to one embodiment of the present invention.
FIGS. 2 and 3 are exemplary views showing a process of heating a polyethylene plate inside a heating chamber in a method for manufacturing a polyethylene ship according to one embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a mold device for manufacturing a polyethylene vessel according to one embodiment of the present invention.
FIG. 5 is an exemplary diagram showing a process of deforming a polyethylene plate in a mold device for manufacturing a polyethylene ship in a method for manufacturing a polyethylene ship according to one embodiment of the present invention.
FIG. 6 is an exemplary diagram showing a polyethylene vessel manufactured according to a method for manufacturing a polyethylene vessel according to an embodiment of the present invention.
Figure 7 is an exemplary diagram showing a carbon mesh in a method for manufacturing a polyethylene ship according to one embodiment of the present invention.

Hereinafter, with reference to the attached drawings, a mold device for manufacturing a polyethylene vessel and a method for manufacturing a polyethylene vessel according to a preferred embodiment of the present invention will be described in detail.

FIG. 1 is a flow chart showing a method for manufacturing a polyethylene vessel according to an embodiment of the present invention, FIGS. 2 and 3 are exemplary views showing a process in which a polyethylene plate is heated inside a heating chamber in a method for manufacturing a polyethylene vessel according to an embodiment of the present invention, FIG. 4 is a cross-sectional view showing a mold device for manufacturing a polyethylene vessel according to an embodiment of the present invention, FIG. 5 is an exemplary view showing a process in which a polyethylene plate is deformed in a mold device for manufacturing a polyethylene vessel according to an embodiment of the present invention, FIG. 6 is an exemplary view showing a polyethylene vessel manufactured according to an embodiment of the present invention, and FIG. 7 is an exemplary view showing a carbon mesh in a method for manufacturing a polyethylene vessel according to an embodiment of the present invention.

As shown in FIGS. 1 to 7, a method for manufacturing a polyethylene ship according to an embodiment of the present invention includes a series of steps of: arranging a carbon mesh inside a heating chamber; arranging a polyethylene plate on an upper surface of the carbon mesh; heating the inside of the heating chamber to a melting temperature of polyethylene by a heating means so that the polyethylene plate is melted (s10); arranging the carbon mesh and the molten polyethylene plate on the upper portion of a mold device for manufacturing a polyethylene ship; vacuum-absorbing the carbon mesh and the molten polyethylene plate in accordance with the surface contour of the mold device and deforming (s20); and manufacturing a polyethylene hull by cooling and hardening the polyethylene plate and removing it from the mold device (s30).

In addition, a system for manufacturing a polyethylene vessel according to one embodiment of the present invention includes a heating chamber (100) and a mold device (200) for manufacturing a polyethylene vessel, and it is preferable that the mold device (200) for manufacturing a polyethylene vessel includes a mold body (210) and a vacuum suction means (220).

Hereinafter, a method for manufacturing a polyethylene vessel according to an embodiment of the present invention will be described in detail. At this time, in an embodiment of the present invention, it is most preferable that the polyethylene is provided as high-density polyethylene (HDPE).

In detail, referring to FIG. 2, a carbon mesh (2) is arranged inside a heating chamber (100), a polyethylene plate (1A) is arranged on the upper surface of the carbon mesh (2), and as the inside of the heating chamber (100) is heated to the melting temperature of polyethylene by a heating means (not shown), the polyethylene plate (1A) is melted (s10). At this time, melting means that the polyethylene plate is liquefied into a viscous liquid so that it flows flexibly, making it easy to process and deform.

Here, the heating chamber (100) may be provided in a dome shape with an inverted 'U' shape so that a heating space is formed inside, and it is preferable to include a heating means (not shown) that may be provided as a heater or the like so that the inside of the heating space is selectively heated. For example, the heating means (not shown) may be arranged inside the heating chamber (100).

In addition, the heating chamber (100) may include a stand (101) having a flat top plate, which is disposed inside the heating space and on which the carbon mesh (2) and the polyethylene plate (1A) are mounted. Accordingly, the carbon mesh (2) and the polyethylene plate (1A) may be disposed on the upper surface of the stand (101) and heated while being disposed in the heating space inside the dome-shaped heating chamber (100).

Here, it is preferable that the upper surface area of the support (101) be set to be equal to or greater than the area of the carbon mesh (2). In addition, it is preferable that the area of the carbon mesh (2) be set to be equal to or greater than the area of the polyethylene plate (1A). In addition, the area of the polyethylene plate (1A) may be prepared to correspond to the area of the polyethylene hull (1D) to be manufactured. Here, since the polyethylene plate (1A) may shrink when heated, it is preferable that the area of the polyethylene plate (1A) be set to be equal to or greater than the area of the polyethylene hull (1D) to be manufactured.

And, the carbon mesh (2) is provided with a carbon material having excellent heat resistance and strength, and it is preferable that a plurality of perforated holes (2a) are formed vertically penetrating the carbon mesh (2) in the longitudinal and transverse directions. For example, referring to Fig. 7, the carbon mesh (2) may be provided as a carbon fiber woven body in which a plurality of carbon fibers are woven crosswise in a '#'-shaped lattice shape along the longitudinal and transverse directions, with each perforated hole (2a) formed therebetween. At this time, the carbon mesh (2) can be easily bent by an external force.

Accordingly, a carbon mesh (2) may be arranged in the longitudinal and transverse directions inside the heating chamber (100), and a polyethylene plate (1A) may be arranged on the upper surface of the carbon mesh (2). At this time, the lower surface of the carbon mesh (2) may be in surface contact with the upper surface of the support (101), and the lower surface of the polyethylene plate (1A) may be in surface contact with the upper surface of the carbon mesh (2). That is, the carbon mesh (2) may be arranged between the lower surface of the polyethylene plate (1A) and the upper surface of the support (101).

Next, as the interior of the heating chamber (100) is heated to the melting temperature of polyethylene by the heating means (not shown), the polyethylene plate (1A) is melted. At this time, the melting temperature of the polyethylene can be set to a temperature at which the polyethylene plate (1A), which is a high-density polyethylene material, melts. For example, the melting temperature of the polyethylene can be set to 130 to 138°C.

In addition, the carbon mesh (2) does not melt at the melting temperature of the polyethylene. That is, it is preferable to understand that the interior of the heating chamber (100) is heated by the heating means (not shown) in a temperature range between the melting temperature of the polyethylene and higher and the melting temperature of the carbon mesh (2) lower.

And, referring to FIG. 3, after the polyethylene plate (1A of FIG. 2) is melted, the carbon mesh (2) and the melted polyethylene plate (1B) are placed on the upper surface of the support (101), and the heating chamber (100) provided in a dome shape can be removed.

Next, the carbon mesh (2) and the molten polyethylene plate (1B) can be simultaneously transferred to a mold device (200) for manufacturing a polyethylene ship, which will be described later. At this time, the transfer of the carbon mesh (2) and the molten polyethylene plate (1B) can be performed by a separate transfer device (not shown), and can also be performed manually by a worker.

Here, with the molten polyethylene plate (1B) placed on the upper surface of the carbon mesh (2), the carbon mesh (2) can be easily transferred to the mold device (200) for manufacturing a polyethylene ship without the molten polyethylene plate (1B) falling off or being lost by the transfer device (not shown) or the worker. Thus, the convenience of work can be significantly improved.

Meanwhile, the carbon mesh (2) and the molten polyethylene plate (1B) are placed on the upper part of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship, and the carbon mesh (2) and the molten polyethylene plate (1B) are vacuum-absorbed and deformed in correspondence to the contour of the upper surface of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship through the vacuum suction groove (211) formed sunken in the surface of the mold body (210) so that a vacuum suction force is provided (s20).

In detail, referring to Fig. 4, the mold device (200) for manufacturing the polyethylene ship is preferably formed with a cross-sectional outline corresponding to the hull to be manufactured and extended along the longitudinal direction. At this time, it is preferable to understand that the hull to be manufactured is a hull having an inverted 'V' or 'U' cross-sectional shape and extending in the longitudinal direction.

Here, it is preferable that the mold device (200) for manufacturing the polyethylene vessel includes a mold body (210) and a vacuum suction means (220).

In addition, it is preferable that the mold body (210) be formed with a cross-sectional outline corresponding to the hull to be manufactured and extend along the longitudinal direction.

At this time, the mold body (210) is formed to be curved downward from the center in the width direction to both sides in the width direction, and may be formed to be curved so that the shape of the upper surface along the width direction corresponds to the hull to be manufactured. In addition, the mold body (210) may have the same cross-sectional shape and may extend along the length direction. Of course, depending on the case, the length direction sides of the mold body (210) may be formed in a shape that becomes narrower toward the center in the width direction as they go toward the ends in response to the shape of the hull.

And, on the surface of the mold body (210), a plurality of vacuum suction grooves (211) are formed downwardly recessed in each curved area corresponding to the hull to be manufactured along the width direction of the mold body (210), and it is preferable that each vacuum suction groove (211) is formed to extend along the length direction. At this time, it is preferable that each vacuum suction groove (211) is formed to be spaced apart from each other along the width direction of the mold body (210).

For example, one of the vacuum suction grooves (211) may be formed by recessing downward from the upper surface of the center side in the width direction of the mold body (210) and may extend along the length direction. In addition, the remaining vacuum suction grooves (211) may be formed by recessing downward from the upper surface of each folded region or each curved region on both sides in the width direction of the mold body (210) and may extend along the length direction. Each of these vacuum suction grooves (211) may be formed by recessing downward in a 'U' cross-section shape and may extend along the length direction of the mold body (210).

Furthermore, the sinking direction of each of the vacuum suction grooves (211) may be set in a direction that forms a right angle with the surface of the mold body (210) in the area where each of the vacuum suction grooves (211) is formed. Accordingly, the vacuum suction force due to the vacuum pressure formed in each of the vacuum suction grooves (211) can be uniformly applied to the carbon mesh (2) and the molten polyethylene plate (1B) positioned opposite thereto.

In addition, it is preferable that a plurality of suction channels (212) are formed through the mold body (210), each having one end connected to the bottom surface of the vacuum suction groove (211), a central portion penetrating into the inside of the mold body (210), and the other end individually connected to the vacuum suction means (220).

At this time, it is preferable that one suction path (212) is individually connected between one vacuum suction groove (211) and the vacuum suction means (220). That is, one suction path (212) is not connected to another vacuum suction groove (211). In other words, it is preferable to understand that each suction path (212) is independently partitioned and connected between each vacuum suction groove (211) and the vacuum suction means (220). Accordingly, it can be controlled by a control unit (not shown) described below so that vacuum pressure is individually and independently formed in each vacuum suction groove (211).

And, each of the suction channels (212) may be connected to multiple points while being spaced apart from each other at equal intervals along the length direction of the mold body (210) on the bottom surface of the vacuum suction groove (211) at one end. Accordingly, vacuum pressure may be uniformly formed along the length direction of the mold body (210) in the vacuum suction groove (211).

In addition, the vacuum suction means (220) is individually connected to the other end of each suction path (212) and may be provided as at least one vacuum pump.

Meanwhile, referring to FIG. 5, the carbon mesh (2) and the molten polyethylene plate (1B) are placed on the upper part of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship, and the carbon mesh (2) and the molten polyethylene plate (1B) are vacuum-absorbed and deformed to correspond to the contour of the upper surface of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship.

In detail, the lower surface of the carbon mesh (2) is placed facing each other on the upper part of the mold body (210), and the molten polyethylene plate (1B) is placed on the upper surface of the carbon mesh (2).

Here, the width-wise central portion of the carbon mesh (2) on which the molten polyethylene plate (1B) is arranged on the upper surface is aligned and settled in the width-wise central portion of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship, but the width-wise both sides of the carbon mesh (2) can be gradually lowered and deformed by gravity.

In addition, as the widthwise sides of the carbon mesh (2) are gradually deformed downward by gravity, vacuum pressure is sequentially formed in the vacuum suction groove (211) near the place where the carbon mesh (2) touches, so that the carbon mesh (2) can be closely attached to the mold body (210).

At this time, the central part in the width direction of the carbon mesh (2) is first brought into close contact with the mold body (210), and then both sides in the width direction of the carbon mesh (2) can be sequentially brought into close contact with the mold body (210) as they go towards both ends. At the same time, when the both sides in the width direction of the carbon mesh (2) are gradually lowered and deformed by gravity, it is preferable that the molten polyethylene plate (1B) is also deformed at the same time.

In addition, when the vacuum suction means (220) is driven, the air inside each vacuum suction groove (211) is vacuum-sucked along the suction path (212), so that a negative pressure can be formed inside each vacuum suction groove (211). That is, the pressure inside each vacuum suction groove (211) can be formed to be lower than the pressure outside the mold body (210).

Accordingly, the molten polyethylene plate (1B) and the carbon mesh (2) are deformed by the vacuum suction force formed in each of the vacuum suction grooves (211) and can be brought into close contact with the upper surface of the mold body (210).

Here, it is preferable that the control unit (not shown) controlling the vacuum suction means (220) sequentially controls the vacuum suction means (220). Accordingly, vacuum pressure can be sequentially formed along both sides of the central portion in the width direction of the mold body (210) of the mold device (200) for manufacturing a polyethylene vessel in each of the vacuum suction grooves (211) spaced apart from each other by the vacuum suction means (220).

Through this, vacuum pressure is sequentially formed along both sides from the center in the width direction of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship to each of the mutually spaced vacuum suction grooves (211), so that the carbon mesh (2) can be sequentially brought into close contact with the surface of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship from the center in the width direction to both sides in the width direction.

Accordingly, the molten polyethylene plate (1B) and the carbon mesh (2) are deformed by the vacuum suction force formed in each of the vacuum suction grooves (211) and are completely adhered to the upper surface of the mold body (210) without distortion, so that manufacturing precision can be significantly improved.

In addition, at the same time that the carbon mesh (2) is adhered to the surface of the mold body (210), the molten polyethylene plate (1B) can be deformed corresponding to the deformed shape of the carbon mesh (2). At this time, it is preferable to understand that the polyethylene plate illustrated in FIG. 3 is described as the molten polyethylene plate (1B), and the polyethylene plate illustrated in FIG. 5 is described as the molten deformed polyethylene plate (1C).

And, it is preferable that the lower surface of the carbon mesh (2) is in close contact with the upper surface of the mold body (210) of the mold device (200) for manufacturing the polyethylene ship, and at the same time, the edge-side opening (211a) of the vacuum suction groove (211) is covered by the lower surface of the carbon mesh (2) in the area opposite to the edge-side opening (211a) of the vacuum suction groove (211).

That is, it is preferable that the lower surface of the carbon mesh (2) in the area opposite the edge-side opening (211a) of the vacuum suction groove (211) is not sucked into the inside of the vacuum suction groove (211) and is arranged in a form that covers the edge-side opening (211a) of the vacuum suction groove (211). In addition, the melt-deformed polyethylene plate (1C) arranged on the upper surface of the carbon mesh (2) in the area opposite the edge-side opening (211a) of the vacuum suction groove (211) is not sucked into the inside of the vacuum suction groove (211).

Accordingly, since the carbon mesh (2) is placed between the molten, deformed polyethylene plate (1C) and the edge-side opening (211a) of the vacuum suction groove (211), local inflow of the molten, deformed polyethylene plate (1C) into the vacuum suction groove (211) can be blocked.

Here, it is preferable that the penetration area of each of the perforation holes (2a) be set to be less than the penetration area of each of the suction channels (212). At this time, it is most preferable that the ratio between the penetration area of each of the perforation holes (2a) and the penetration area of each of the suction channels (212) be set to 1:2, but it is not limited thereto. For example, the diameter of each of the perforation holes (2a) may be set to 2 to 5 mm, while the diameter of each of the suction channels (212) may be set to 4 to 10 mm.

Furthermore, in some cases, the mold device (200) for manufacturing the polyethylene vessel may further include an auxiliary pressing unit (not shown) provided with an opposing surface contour corresponding to the upper surface contour of the mold body (210) so as to conform to the surface of the molten, deformed polyethylene plate (1C) and press it tightly.

Accordingly, the auxiliary pressing part (not shown) is pressed against the surface of the molten, deformed polyethylene plate (1C) placed on the upper surface of the mold body (210), and cooling of the molten, deformed polyethylene plate (1C) is performed while being pressed, so that the precision of the manufactured shape can be improved.

In addition, in some cases, a worker may further manually pressurize the surface of the molten polyethylene plate (1C) placed on the upper surface of the mold body (210) using a tool.

Meanwhile, referring to FIG. 6, the polyethylene plate (1C) is cooled and hardened and is released from the mold body (210) of the mold device (200) for manufacturing the polyethylene ship, thereby manufacturing the polyethylene hull (1D) (s30). That is, it is preferable to understand that the molten, deformed polyethylene plate (1C) is cooled and hardened, thereby manufacturing the polyethylene hull (1D).

Here, the molten transformed polyethylene plate (1C) can be maintained in a state where the vacuum suction means (220) is controlled to operate when cooling. Accordingly, vacuum pressure is formed in the vacuum suction groove (211), so that the carbon mesh (2) and the molten transformed polyethylene plate (1C) can be cooled and hardened while being in close contact with the mold body (210).

And, after the molten, deformed polyethylene plate (1C) is cooled and hardened, the polyethylene hull (1D) and the carbon mesh (2) can be removed from the mold body (210). Furthermore, the carbon mesh (2) can be separated from the polyethylene hull (1D) and removed. Of course, in some cases, the carbon mesh (2) can be mutually bonded to the polyethylene hull (1D) and used simultaneously.

Through this, the shape of the polyethylene hull (1D) can be easily implemented as a streamlined and angular hull shape, while productivity can be significantly improved compared to the past when the hull was manufactured by welding polyethylene plates. At this time, it is preferable to understand that the polyethylene ship in the present invention is used as a concept including the polyethylene hull (1D).

In this way, the present invention provides a synergy effect that allows rapid production of a high-precision polyethylene hull (1D) by allowing the molten polyethylene plate (1B) and the carbon mesh (2) to be vacuum-absorbed onto the upper surface of the mold body (210) by a plurality of vacuum suction grooves (211) formed in each curved area of the surface of the mold body (210) corresponding to the hull to be manufactured along the width direction of the mold body (210) and cooling and hardening while being completely molded and adhered to even the curved areas.

Here, when the molten deformed polyethylene plate (1C) is in close contact with the upper surface of the mold body (210), the carbon mesh (2) in which the perforated holes (2a) are formed is formed between the molten deformed polyethylene plate (1C) and the upper surface of the mold body (210), so that the edge-side openings (211a) of each vacuum suction groove (211) are covered, so that local inflow of the molten deformed polyethylene plate (1C) into the vacuum suction groove (211) is blocked while the close contact is strongly maintained, so that manufacturing precision can be significantly improved.

And, vacuum pressure is sequentially formed along both sides of the central portion in the width direction of the mold body (210) in each of the mutually spaced vacuum suction grooves (211), and the molten polyethylene plate (1B) and the carbon mesh (2) are completely adhered to the upper surface of the mold body (210) without distortion, so that manufacturing precision can be significantly improved.

In addition, when the molten polyethylene plate (1B) is placed on the upper surface of the carbon mesh (2), the carbon mesh (2) can be easily transferred to the mold device (200) for manufacturing a polyethylene ship without the molten polyethylene plate (1B) falling off or being lost by the transfer device (not shown) or the worker. Thus, the convenience of work can be significantly improved.

Here, the terms "include," "compose," or "have" described above, unless otherwise specifically stated, mean that the corresponding component may be present, and therefore should be interpreted as including other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the relevant technology, and shall not be interpreted in an ideal or overly formal sense, unless explicitly defined in the present invention.

As described above, the present invention is not limited to each of the embodiments described above, and modifications may be made by a person skilled in the art without departing from the scope claimed in the claims of the present invention, and such modifications fall within the scope of the present invention.

1A,1B,1C,1D: Polyethylene sheet 2: Carbon mesh
100: Heating chamber 101: Stand
200: Mold device for manufacturing polyethylene ships 210: Mold body
211: Vacuum suction groove 212: Suction path
220: Vacuum suction means

Claims (5)

A first step in which a carbon mesh made of carbon material having a plurality of perforated holes formed therethrough is placed inside a heating chamber, a polyethylene plate made of polyethylene material is placed on the upper surface of the carbon mesh, and the polyethylene plate is melted as the inside of the heating chamber is heated to the melting temperature of polyethylene;
A second step in which the carbon mesh and the molten polyethylene plate are formed into a cross-sectional outline corresponding to a hull to be manufactured and are placed on the upper part of a mold body of a mold device for manufacturing a polyethylene ship extending in the longitudinal direction, and the carbon mesh and the molten polyethylene plate are vacuum-absorbed and deformed corresponding to the surface outline of the mold body through a vacuum suction groove sunken into the surface of the mold body so that a vacuum suction force is provided; and
A method for manufacturing a polyethylene ship, comprising a third step of manufacturing a polyethylene hull by cooling and hardening the polyethylene plate and releasing it from the mold body. In paragraph 1,
In the above second step,
The above vacuum suction grooves are formed in a recessed manner at each curved area corresponding to the hull to be manufactured on the surface of the mold body and extend along the longitudinal direction, and the above vacuum suction grooves are formed in multiple locations and are formed spaced apart from each other along the width direction of the mold body.
A method for manufacturing a polyethylene vessel, characterized in that the mold body has a plurality of suction passages formed, one end of which is connected to the vacuum suction groove, the other end of which penetrates into the inside of the mold body, and the other end of which is individually connected to a vacuum suction means. In the second paragraph,
A method for manufacturing a polyethylene vessel, characterized in that in the second step, the lower surface of the carbon mesh is in close contact with the surface of the mold body so as to block local inflow of the molten, deformed polyethylene plate due to vacuum suction force into the vacuum suction groove, and at the same time, the edge-side opening of the vacuum suction groove is covered by the lower surface of the carbon mesh. In the second paragraph,
The second step above is,
A step in which the central part of the width direction of the carbon mesh, on which the molten polyethylene plate is arranged on the upper surface, is aligned and settled in the central part of the width direction of the mold body, while the two sides of the width direction of the carbon mesh are deformed by gravity;
A method for manufacturing a polyethylene vessel, characterized in that it includes a step of a control unit sequentially controlling the vacuum suction means so that vacuum pressure is sequentially formed along both sides from the center in the width direction of the mold body in each of the mutually spaced vacuum suction grooves so that the carbon mesh is sequentially brought into close contact with the surface of the mold body from the center in the width direction to both sides in the width direction. A mold body formed with a cross-sectional outline corresponding to a hull to be manufactured and extending in the longitudinal direction, and having a plurality of vacuum suction grooves formed in the longitudinal direction and sunken in at each curved area corresponding to the hull to be manufactured on the surface, and having a plurality of suction channels formed in the vacuum suction grooves at equal intervals along the longitudinal direction and having one end connected and penetrating into the interior; and
A mold device for manufacturing a polyethylene vessel, comprising a vacuum suction means individually connected to the other end of each of the above suction passages.