KR100830891B1 - The manufacturing method and water tank low density polyethylene panel - Google Patents

Abstract

A linear type low density polyethylene coated metal steel panel for a water tank is provided to improve productivity of a water tank through easy workability and to save production cost. A manufacturing method of linear type low density polyethylene coated steel panel(9) includes the steps of: serial shaping processes of metal sheet(7) including cutting, embossing, curving, and welding; pretreatment process to remove foreign matters on the surface of metal sheet by sand blast; heating the metal sheet at 200~250°C for 5~10min; fusing and applying linear type low density polyethylene powder(8) on the heated metal sheet by high air pressure; cooling the linear type low density polyethylene coated metal sheet in coolant(0~10°C) for 5~10min; and drying naturally for 1~2hr.

Description

Panels coated with linear low density polyethylene for water tanks and method for manufacturing the same

1 (a) (b) (c) (d) (e) (f) are perspective views of a metal tank having a conventional synthetic resin sheet

        And section and main section.

2 is a linear low density polyethylene coated panel for a water tank applied to the present invention

        And a flow chart of the manufacturing method thereof.

3 is a linear low density polyethylene coated panel for a water tank applied to the present invention

        Main section of the.

<Explanation of symbols for the main parts of the drawings>

1: metal steel plate 2: coating layer

The present invention relates to a panel coated with a linear low density polyethylene for a water tank and a method of manufacturing the same. More specifically, the linear low density polyethylene is coated on the entire outer circumferential surface of a metal steel sheet to solve the problems of rust and durability. The inside of the panel is made to have the durability of the metal sheet, and the outside is made to have the components of excellent low corrosion resistance, corrosion resistance, non-toxicity, acid resistance, etc. of the linear low density polyethylene, and also has strength and hardness than the synthetic resin. It is easy to work with, and in addition, it is cheaper than stainless, so that the cost can be drastically reduced, which greatly improves the quality and reliability of the product and provides high efficiency and excellent products to consumers at low production cost.

As you know, a water tank is a container that stores a large amount of water. It is an indispensable product in daily life such as apartments, buildings, hotels, hospitals, and government offices.

As a conventional technology of the water tank, a number of water tanks have been applied and registered, but among them, a patent application No. 2004-0089196 (Registration No. 0473423) (name: metal tank with a synthetic resin sheet) has been applied for It has been registered.

That is, the above-described conventional technical configuration is as shown in Fig. 1 (a) (b) (c) (d) (e) (f).

The metal tanks of FIGS. 1A and 1B have a structure seated on a foundation plate 300 provided on an upper surface of the pad portion 200 spaced apart from each other. In this case, the metal tank includes a tank body 10 including a plurality of first unit panels 10a constituting a bottom surface, a second unit panel 10b constituting side and top surfaces, and an upper portion of the tank body 10. It consists of an inlet pipe 40, the overflow pipe 60 and the air vent 80 communicated with each other, the drain pipe 70 and the discharge pipe 50 respectively communicated to the lower portion of the tank body 10, the tank The ladder 90 is mounted on the outer surface of the second unit panel 10b for the use, internal cleaning and maintenance of the. Here, the inlet pipe 40 and the air vent 80 is in communication with the upper surface of the second unit panel 10b constituting the upper surface of the tank body 10 and the overflow tube 60 is the tank body 10 It is in communication with the upper side of the second unit panel (10b) forming a side of. The drain pipe 70 communicates with the first unit panel 10a, and the discharge pipe 50 communicates with the lower side surface of the second unit panel 10a constituting the side of the tank body 10. In addition, edges of the first and second unit panels 10a and 10b are bent in an outward direction, and adjacent unit panels 10a and 10b are positioned in contact with each other and the fastening means 30 It is fastened in the outward direction of the tank body 10 by the. And, in order to reinforce the tank body 10, a plurality of struts and beam reinforcements 22 (24; 26) are mounted in the tank body 10, respectively. In addition, the strut reinforcement 22 is adjacent to each other to form an edge of the plurality of first unit panel 10a and the upper surface of the tank body 10, and adjacent to each other to form a ceiling surface integrally fastened together. Both ends are mounted so as to be spaced apart between the edges of two second unit panels 10b. Here, the support reinforcement 22 is preferably mounted at the corners of the unit panels 10a and 10b. In addition, the beam reinforcement (24) (26) is formed so as to be spaced apart from each other between the edges of the plurality of adjacent second unit panels (10b) formed adjacent to each other and integrally fastened to form the side of the tank body (10) have. Here, the beam reinforcing material (24) 26 is preferably mounted to the edge of the second unit panel (10b).

1C to 1F are the main cross-sectional views of FIG. 1A, wherein the metal tank includes a first unit panel 10a in which the synthetic resin sheet 11, the first metal plate 13, and the heat insulating material 15 are sequentially formed, and the synthetic resin sheet. It can be seen that 11, the first metal plate 13, the heat insulating material 15, and the second metal plate 17 are composed of second stacked unit panels 10b. Here, the material of the synthetic resin sheet 11 is particularly suitable for use in water purification tanks as polyethylene (P.E), which is harmless to humans. In addition, the first metal plate 13 uses a tin material in order to replace expensive stainless steel, and the second metal plate 17 replaces expensive stainless steel as described above and additionally It is a colored metal steel sheet which does not require painting. In addition, the thermal insulation material 15 is a urethane in the form of foam, it is characterized by excellent cushioning, thermal insulation and earthquake resistance.

In addition, it is preferable that the thickness of each structure is configured so that the thickness may be small in order of the heat insulating material 15, the synthetic resin sheet 11, the 1st metal plate 13, and the 2nd metal plate 17 in order. Here, as shown in FIGS. 3C and 3D, it can be seen that the heat insulating material 15 does not exist at the edges of the first and second unit panels 10a and 10b.

The adhesive 12 is coated on the interface between the synthetic resin sheet 11 and the first metal plate 13 of the conventional first and second unit panels 10a and 10b to realize a completely close adhesion. Here, the fastening means 30 fastens the bent edge portions of the unit panels 10a and 10b adjacent to each other outside the tank body 10 as described above. The fastening means 30 is a fastening prosthetic steel sheet 30a which is inserted into and disposed at an edge portion of the unit panels 10a and 10b which are in contact with each other, and one side of the fastening prosthetic steel sheet 30a and the unit panel 10a. And a nut 30c fastened to an end of the fastening screw 30b, and a fastening screw 30b penetrating the other side of the bent edge and fastening complementary steel sheet 30a.

However, the above conventional technology has many problems as follows.

That is, the above-described conventional technology has a big problem that the structure is very complicated.

In more detail, the first metal plate 13, the heat insulating material 15, and the second metal plate 17 are sequentially provided on the outer circumferential adhesive 12 of the synthetic resin sheet 11 as well as the front adhesive of the synthetic resin sheet. The first and second metal plates and fastening beam metal steel plates are provided on the surface, and the first and second metal plates and fastening beam metal steel plates are sequentially provided on the back adhesive surface, so that the technical configuration is very complicated, and the manufacturing process is very complicated. In addition to the deterioration of the manufacturing cost also increased a big problem occurred.

In addition, the material used as a conventional water tank is mainly used stainless, but due to the high price of plastic (FRP, SMC) is mainly used. The stainless steel has problems such as rust generation and corrosion due to chlorine gas due to deterioration of the welded part during the manufacture of the product, and the plastic has no fear of rust, but has a weakness of durability due to aging hardening, which is used as a water tank panel. There was a problem not to do.

The present invention has been made in order to solve the above problems of the prior art, the linear low density polyethylene panel for the water tank is produced by the molding process → pretreatment process → heating process → coating process → cooling process → drying process. The first purpose is to solve the problem of rust generation and durability by coating linear low density polyethylene on the entire outer circumferential surface of the metal sheet, and the third purpose is to make the inside of the panel particularly durable. In addition, the outside is to have the components of excellent linearity, corrosion resistance, non-toxicity, acid resistance, etc. of the linear low density polyethylene, the fourth purpose is to have strength and hardness than the synthetic resin, the fifth purpose is easy to work ( Yes: Compared to the prior art, the structure is simple, the bolt assembly is not welding method, and the size can be freely changed The sixth purpose is to reduce the cost significantly due to the lower cost than the stainless steel, and the seventh purpose is to provide antimicrobial and deodorizing effect by far-infrared radiation including elvan and kaolin in linear low density polyethylene. In addition, it is possible to purify and decompose pollutants and heavy metals contained in water, and the eighth purpose is to greatly improve the quality and reliability of the product and to provide high-efficiency products with low production cost. Provided are a linear low density polyethylene coated panel for a water tank and a method for manufacturing the same, which can be supplied to a consumer.

In order to achieve the above object, the present invention cuts the metal sheet to the size of the panel for the water tank. A series of molding processes for embossing, bending, and welding; a pretreatment process of removing foreign matters on the surface of the metal sheet after sand forming by sand blast; A heating step of heating the metal steel sheet at 200 to 250 ° C. for 5 to 10 minutes after the pretreatment step; A coating step of forming a coating layer by fusing the linear low density polyethylene powder on the surface of the metal steel sheet by the high pressure air pressure after the heating step; A cooling step of cooling the metal plate coated with the linear low density polyethylene coated steel plate in cooling water (0 to 10 ° C.) for 5 to 10 minutes after the coating step; It provides a method for producing a linear low-density polyethylene-coated panel for a water tank, characterized in that by the; drying step of natural drying for 1 to 2 hours after the cooling step.

The present invention also provides a panel coated with a linear low density polyethylene for a water tank prepared by the above method.

Hereinafter, described in detail with reference to the accompanying drawings a preferred embodiment of the present invention for achieving this purpose are as follows.

The panel coated with a linear low density polyethylene for a water tank applied to the present invention and a method of manufacturing the same are configured as shown in FIGS. 2 and 3.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The following terms are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and their definitions should be made based on the contents throughout the specification.

(Example 1)

First, the present invention is to cut the metal steel sheet (7) to fit the size of the water tank panel (9). It goes through a series of molding processes, embossing, bending and welding. (S1)

Thereafter, after the forming process, the foreign matters deposited on the surface of the metal sheet are subjected to a pretreatment process to be removed by sand blast (sand blast) cleanly (S2).

At this time, the sand blast is a method in which sand is blown with compressed air to clean the surface of a metal product such as a metal sheet, thereby removing foreign matters and rust attached to the surface of the article. In addition, it finishes with a fine concavo-convex surface, and the concave-convex surface creates a condition that the linear low-density polyethylene can be firmly fused during the subsequent coating process.

After the pretreatment step, the present invention undergoes a heating step of heating the metal sheet at 200 to 250 ° C. for 5 to 10 minutes.

At this time, the reason for the temperature conditions (200 to 250 ° C.) and time (5 to 10 minutes) is that if the temperature conditions are 200 ° C. or less, and the time is 5 minutes or less, fusion by heat of the metal steel sheet 7 itself is unstable. When the temperature condition is 250 ° C or more and the time is 10 minutes or more, the linear low density polyethylene, elvan, and kaolin powder fused to the metal sheet 7 flows down, resulting in uneven coating thickness. ) And time (5 to 10 minutes) are preferred.

In addition, the present invention is subjected to a coating step of forming a coating layer by fusion of a linear low density polyethylene (LLDPE: Linear Low Density Polyethylene) (4a) on the surface of the metal sheet 7 by the high pressure air pressure after the heating step (S4). )

In this case, although the polyethylene (PE) powder or the low density polyethylene (LDPE) powder may be used in the coating process of the present invention, it is preferable to use the linear low density polyethylene powder 4a. This is because the linear low density polyethylene powder 4a has excellent mechanical workability, no toxicity, no taste, excellent heat sealing, and is simple, inexpensive, and various colors can be added.

After the coating process, the linear low-density polyethylene-coated metal sheet is put in a cooling water (0 to -10 ° C) and subjected to a cooling process for 5 to 10 minutes. (S5)

At this time, the reason for the temperature of the cooling water (0-10 ° C.) and the time (5-10 minutes) is that if the temperature condition is 0 ° C. or more and the time is 5 minutes or less, the surface is not smooth because the cooling rate is too slow. There is a problem, when the temperature condition is -10 ° C or less and the time is 10 minutes or more, there is a problem that the cooling rate is too fast to break the coating layer 8, the temperature (0 ~ -10 ° C) and the time (5 -10 minutes) is preferred.

In addition, the present invention is to produce a linear low density polyethylene panel (9) for the water tank through a drying step of natural drying for 1 to 2 hours from the outside after the cooling step. (S6)

(Example 2)

The present invention can of course manufacture a linear low density polyethylene panel (9) for water tank by coating the coating layer (8) by the high pressure air pressure together with the elvan (4b) or kaolin (4c) powder in the coating process. .

At this time, the elvan rock (4b) is known as a stone having a water purification (淨水) action, and emits far infrared rays used in jjimjilbang, tableware, medical equipment.

And the kaolin 4c prevents the growth of mold and mites, and has a strong deodorizing effect.

Therefore, the linear low density polyethylene panel 9 for the water tank applied to the present invention exhibits antibacterial and deodorizing effects due to far-infrared radiation, as well as adsorption, decomposition and purification of pollutants and heavy metals contained in water. Will be provided.

(Example 3)

The present invention is a linear low-density polyethylene and elvan and kaolin powder in the coating process is mixed together in a ratio of 8: 1: 1 to produce a linear low density polyethylene panel for water tank.

The ratio is the most preferable ratio in the production of a linear low density polyethylene panel (9) for the water tank, when the ratio of the linear low density polyethylene is included 8 or more far infrared effect is reduced, the ratio of elvan and kaolin is at least 1 When included, the ratio is most desirable as the adhesion and surface are not smooth.

(Example 4)

In addition, the present invention can manufacture a linear low density polyethylene panel (9) for the water tank by the method of spraying the coating process by air pressure, as well as can be manufactured by injection mold as follows.

That is, the linear low density polyethylene, elvan and kaolin powders are mixed with each other and melted together, followed by injection molding with a metal sheet to prepare a linear low density polyethylene panel for a water tank.

As described above, when the linear low density polyethylene panel for the water tank is manufactured by the injection mold, the manufacturing process is simple and the productivity can be increased.

In the present invention has been described to produce a water tank using a linear low density polyethylene panel (9), the present invention is not limited to this, but other than the water tank can be used as a storage tank (vessel) of course.

The dissolution test of the linear low density polyethylene panel for the water tank of the present invention, that is, the dissolution test result of the material inside the water tank is shown in the following table.

[Table] Dissolution Test

Item Result Reference value Smell and taste clear No problem Turbidity 1 degree 2 degrees or less Chromaticity 3 degree 5 degrees or less Heavy metals (Pb) 0.05 ppm 0.1 ppm or less Potassium Permanganate (KMnO4) 7 ppm 10 ppm or less pH 6.0 5.8-8.6 phenol 0.002 ppm 0.005 ppm or less Evaporated residue 10 ppm 30 ppm or less Residual chlorine 0.1 ppm 0.2 ppm or less

As a result, all of the result values used by assembling the water tank using the panel applied to the present invention have been judged to pass the standard value, and are corrosion resistance (no corrosion due to iron that sinks to the surface during processing), hygiene (surface is clean and corrosion resistance Because of its strength, it has excellent hygiene and cleanliness even after long-term use), durability (without falling life due to corrosion), cleanability and maintainability (smooth surface, simple internal reinforcement, easy to clean and easy to maintain) ) Gives very high effect.

On the other hand, the present invention may be variously modified and may take various forms in applying the above configuration.

And it is to be understood that the invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood that.

As described in detail above, the present invention aims to produce a linear low density polyethylene panel for a water tank by a molding process, a pretreatment process, a heating process, a coating process, a cooling process, and a drying process.

In addition, the present invention is to solve the problem of rust generation and durability at the same time by coating a linear low-density polyethylene on the entire outer peripheral surface of the metal sheet.

In particular, the present invention is to provide the inside of the panel to have the durability of the metal steel plate and the outside to have the components such as excellent corrosion resistance, corrosion resistance, non-toxicity, acid resistance of linear low density polyethylene.

The present invention is also intended to have strength and hardness than synthetic resins.

In addition, the present invention is easy to work (for example, the structure is simple compared to the prior art, the welding method is a bolt assembly method, and can be manufactured in various sizes and shapes free to change the size).

In addition, the present invention is to be significantly cheaper than stainless steel to significantly reduce the cost.

In addition, the present invention, including the elvan and kaolin in the linear low-density polyethylene to show the antibacterial and deodorizing effect by far-infrared radiation, as well as to adsorb, decompose and purify the pollutants and heavy metals contained in water.

The present invention is a very useful invention that can significantly improve the quality and reliability of the product due to the above effects and to supply a high-efficiency excellent product to the consumer at a low production cost.

Claims (5)

Metal sheet is cut to fit the water tank panel. A series of forming processes for embossing, bending and welding; A pretreatment step of removing foreign matters on the surface of the metal sheet after sand forming by sand blast; A heating step of heating the metal steel plate at 200 to 250 ° C. for 5 to 10 minutes after the pretreatment step; A coating step of forming a coating layer by fusing the linear low density polyethylene powder on the surface of the metal steel sheet by the high pressure air pressure after the heating step; A cooling step of cooling the metal plate coated with the linear low density polyethylene coated steel plate in cooling water (0 to 10 ° C.) for 5 to 10 minutes after the coating step; Method for producing a linear low-density polyethylene-coated panel for a water tank, characterized in that by the; drying step of natural drying for 1 to 2 hours after the cooling step. According to claim 1, The coating process is a method of producing a linear low-density polyethylene coated panel for water tank, characterized in that the elvan or kaolin powder is coated by a high pressure air pressure together. The method according to claim 1 or 2, The coating process is a linear low density polyethylene, ganban stone and kaolin powder is a method of manufacturing a panel coated with a linear low density polyethylene for water tank, characterized in that the coating is mixed together in a ratio of 8: 1: 1. According to claim 3, The method of manufacturing a linear low density polyethylene coated panel for a water tank, characterized in that the injection molding together with a metal sheet after melting the linear low density polyethylene, elvan and kaolin powder. A linear low density polyethylene coated panel for a water tank made by the method of claim 1.

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