KR20190115373A - Manufacturing method for Synthetic resin multilayer plate - Google Patents

Abstract

The present invention seeks to reduce the weight of the center plate filled in the center of the flooring material in the first extruder by using mixed raw materials such as waste resin and sawdust to obtain a center plate of 18 ± 2 mm thickness from the first extruder, and then passes through a sufficient cabinet process. Get the intermediate product from the tea extrusions,
The new resin is extruded to a thickness of 5 ± 1 mm when the central plate obtained in the first step is introduced into the intermediate product into the center of the second extruder and the new resin is supplied from both sides of the outer edge of the central plate introduced into the second extruder. It is a technology related to molding synthetic resin sheet that obtains the finished product of container flooring material that does not cause warpage during use through the manufacturing process by wrapping the outer edge of the plate with new resin and extruding it into a standard product with a total thickness of 28 ± 2mm.
This is a container flooring material for export container flooring, consisting of 28 ± 2mm-thick standard products, and a center plate material of 18 ± 2mm-thick container flooring material using raw materials mixed with recycled waste resin and wood powder from the first extruder. After obtaining the core plate into the center of the second extruder, the new resin is extruded to a thickness of 5 ± 1 mm on both sides of the outer edge of the center plate and wrapped around the outer edge of the center plate with a new resin to provide a standard product of 28 ± 2 mm thick It features a container flooring.

Description

Manufacturing method for cargo container flooring consisting of multi-layered synthetic resin {Manufacturing method for Synthetic resin multilayer plate}

The present invention relates to a method for manufacturing a container flooring material for cargo consisting of a multi-layered synthetic resin plate, and more particularly, when the synthetic resin plate is obtained in a multi-layered structure using different raw materials, waste resin and wood powder to be recycled from the first extruder The first step of obtaining the center plate of the cargo container flooring material having a thickness of 18 ± 2 mm using the mixed raw materials, and the center plate obtained in the first step process flows into the center of the second extruder and both sides of the outer edge of the center plate The new resin is extruded to a thickness of 5 ± 1 mm when the new resin is supplied in the invention and a technique for the extrusion molding method of a multi-layered synthetic resin sheet material provided so that the overall thickness of the container bottom material to form a standard product of 28 ± 2 mm thick.

The container for cargo transportation is a hardware structure using roughly metal plate or section steel, and the rigidity of the outside of the container is excellent, but the shock absorption is structurally poor in the interior where the cargo is loaded. In order to prevent the shock absorbing interior material is additionally installed.

Such interior materials are generally divided into wall materials and floor materials in the container. This interior material has been mainly used for wood, and there is no problem in the case of wall materials using wood in such interior materials, but it is invasive when the floor material is used as wood. Unsanitary problems such as decay due to rot and the inability to wash and sterilize are raised due to bacterial transmission.

In Korea, the first alien species of red fire ants were found in Gamman Wharf in Busan in 2017, and traps were installed at ports and inland container bases, and quarantine was carried out to prevent the spread of fire ants. The next day, an ant nest was found and burned by 1,000 ants, and there was an emergency to prevent the spread of fire ants nationwide.

As a countermeasure against the problems of the container flooring material provided with the wood as described above, many container flooring materials using synthetic resins have been tried and developed so as to easily perform the cleaning and sterilization as well as durability, for example. The apparatus for manufacturing a synthetic resin sheet disclosed in -645935 is divided into a foam molding machine disposed in parallel with an extruder and an extruder, and a drawer for drawing a product extruded through these extruders and foam forming machines. Disclosed is a technology for manufacturing flooring materials.

In addition to the above technology, in order to reduce weight, it is a utility model registration technology No. 20-0311168 technology for hollow container flooring material, patent technology No. 10-0534050 technology for container floor material technology, and floor material manufacturing device technology for cargo transportation container. Registered Patent No. 10-1066600, multi-layer flooring material of cargo container and its manufacturing method related technology, and recycled waste synthetic resin by using Patent No. 10-1137521 technology, and using the new and recycled synthetic resin to form the floor material of the container into a multi-layer structure Many prior arts have been proposed to increase strength and durability.

However, in fact, the thickness of the flooring material is required for the export of the container flooring material, which is 28mm in thickness. In the case of obtaining a container flooring material having a thickness of 28mm as a manufacturing apparatus or a manufacturing means of the conventionally disclosed technique as described above, When applied to obtain finished product by melting waste synthetic resin or recycled synthetic resin at high temperature range, forming multi-layer structure through extrusion mold, and performing sizing and cooling process, it is initially produced as a standard product with a thickness of 28 mm. However, after one or two months of product storage, the flooring material does not maintain a horizontal state and warpage occurs on one side, or the flooring material used as a container flooring product immediately after production is used as a container flooring material during use. There has been a situation in which warpage occurs and a frame is raised.

This is because when the raw material such as waste resin or recycled resin is melted in the high temperature range of 250 ~ 280 ℃ and extruded through the extrusion furnace of the mold in the state of high temperature molten resin, the thickness of the container floor material is 18mm or more. Since the high heat formed in the inner layer is not sufficiently extinguished, the internal structure of the extrudate is not stabilized, so it retains residual heat, and the resin is sold according to the influence of temperature or environment formed between the inside and the outside of the flooring during the sale of the product. It is thought that because of the attraction force of one side, bending phenomenon occurs on one side.

The present applicant has been filed by the present inventors Patent Application No. 10-1822104 "Extrusion molding apparatus for obtaining a synthetic resin plate material formed with a hollow portion, and a synthetic resin plate material having a hollow portion obtained by using the same, Patent No. 10-1379284" Extrusion molding having a die of a multilayer extrusion structure Apparatus and extrusion molding method of a synthetic resin plate using the same ", Patent No. 10-1166899" Extrusion molding apparatus having a die of a multi-layer extrusion structure and extrusion molding method of a synthetic resin plate using the same ", etc. If the flooring product is subjected to numerous trial errors in order to find the cause of the occurrence of the cram due to the warpage of the container flooring intermittently in the field application process, the container flooring material is one side during the process of using the product. The invention completed by confirming the fact that bending does not occur The.

The present invention has been made to improve the problems of the prior art as described above, the present application is designed to reduce the weight of the central plate filled in the center of the bottom ash in the first extruder by using a mixed raw material such as waste resin and sawdust, the first extruder To obtain 18 ± 2mm thickness of core plate and through intermediate cabinet process to obtain intermediate product as primary extrudates.

The new resin is extruded to a thickness of 5 ± 1 mm when the central plate obtained in the first step is introduced into the intermediate product into the center of the second extruder and the new resin is supplied from both sides of the outer edge of the central plate introduced into the second extruder. Forming method of synthetic resin sheet that uses the manufacturing process of wrapping the outer edge of the plate with new resin and extruding the container flooring material that does not cause warpage during use through the manufacturing process of extruding the standard thickness of container flooring material to 28 ± 2mm thickness. It is intended to provide a mold structure.

The present invention is a method for producing a container container flooring material having a standard product of 28 ± 2 mm thickness using a synthetic resin plate of a multi-layer structure, 18 ± 2 mm using a raw material mixed with the waste resin and wood powder to be recycled from the first extruder New resin is supplied from both the first stage extrusion process to obtain the center plate of the cargo container bottom of thickness and the center plate obtained in the first stage into the center of the second extruder and the outer edge of the center plate introduced into the second extruder Stage 2 extrusion process where the new resin is extruded to a thickness of 5 ± 1mm and the outer edge of the center plate with 18 ± 2mm thickness is wrapped with the new resin to extrude the total thickness of the container floor to a standard product with a thickness of 28 ± 2mm. The invention has been completed by confirming that the above object can be achieved through the manufacturing method of a container flooring material for cargo comprising a.

In the method of manufacturing a container flooring material disclosed herein, the first step and the second step extrusion process may proceed continuously. After the first step of the extrusion process is carried out a cooling process is preferably carried out so that the surface temperature of the extruded product is sufficiently cooled in the range of 50 ~ 60 ℃ range is applied so that the second stage extrusion process is performed.

Therefore, the present application is a container container flooring material consisting of a multi-layered synthetic resin sheet and a standard product having a thickness of 28 ± 2 mm, and a cargo material having a thickness of 18 ± 2 mm using a raw material mixed with recycled waste resin and wood powder from the first extruder. After obtaining the center plate of the container flooring material, the center plate is introduced into the center of the second extruder, and the new resin is extruded to a thickness of 5 ± 1 mm on both sides of the outer edge of the center plate, and the outer edge of the center plate is wrapped with the new resin. The container container flooring standard product which is provided as a standard product can be provided.

In addition, the present application is an extrusion mold for obtaining a container container flooring material consisting of a standard product of 28 ± 2㎜ thickness using a multi-layer synthetic resin plate, the extrusion die mold is a first mold plate, a second mold plate, a third mold plate, It is divided into fourth mold plate and molten resin is supplied and extruded by 5 ± 1mm thickness between the first mold plate and the second mold plate, and the center plate is 18 ± 2mm thickness between the second mold plate and the third mold plate. Molten resin is supplied and extruded between the third mold plate and the fourth mold plate with a thickness of 5 ± 1 mm to cover the outer edge of the center plate with molten resin to obtain a cargo container bottom having a thickness of 28 ± 2 mm. Extrusion mold is disclosed.

Hereinafter, specific embodiments of the present invention for obtaining a synthetic resin plate having a multilayer structure of the present application will be described in detail with reference to the drawings given in the following detailed description.

The present invention is one side of the container flooring material to be useful in the application of building interior materials, building flooring material, container flooring material, logistic loading stand, aviation and ship flooring material, cargo box or flooring material, etc. As a result, warpage may occur to provide a flooring material having a thickness of 28 ± 2 mm without fear of occurrence of a crack.

1 is an application example of a molding apparatus for obtaining an extruded molded article having a three-layer structure in the prior art.
Figure 2 is an application example of the extrusion machine to which the present invention is applied to obtain an extrusion molded article of a three-layer structure.
Figure 3 is an illustration of an extrusion die presented in an internal perspective to explain the internal structure of the extrusion die in the extrusion molding machine applied in the present invention
4 is an exemplary view of an extruded article provided by applying the present invention.

Hereinafter, with reference to the accompanying drawings showing a prior art application of the extrusion molding machine for producing a multi-ply synthetic resin sheet according to a preferred embodiment of the present invention as shown in Figure 1 and an application drawing of the extrusion molding machine applied in the present technology Presented as 2 will be described in detail the difference between the extrusion molding device of the configuration that the outer shell layer wraps the outer edge of the central plate material provided as the inner foam layer.

Figure 1 is a plan view showing the apparatus for manufacturing a synthetic resin plate of the present application applied in the prior art, the embodiment applied to the manufacturing process to make the most of the applicant's prior application technology as well as the multi-layered synthetic resin plate is the first extruder 100 and Sizing having a second extruder 200 disposed in parallel to one side of the first extruder 100 in parallel, and shaping the unmolded article extruded using the first extruder 100 and the second extruder 200 ( 300) A multi-layered synthetic resin sheet is obtained through a pressing part 400 for pressing and cooling a product made with a process and sizing to a predetermined range and a drawing cut part 500 for pulling and cutting a product past the pressing part process, and a product transfer roller. It has been applied to form an extrusion molding device of the configuration that is sent to the finished product (70) through the (600).

By using the conventional synthetic resin sheet manufacturing apparatus shown in Figure 1 by explaining in more detail the manufacturing process for obtaining a synthetic resin plate recycled to the base of the container, flooring of the logistics loading floor, flooring of the aviation and ships, loading box of the truck, etc. As a result, the waste synthetic resin raw material composition supplied from the central extrusion hole of the first extruder 100 is crushed into waste plastics such as vinyl, which are discarded after use in rural areas, to the raw material supply hopper 110 together with the raw materials such as foam materials. When supplied and heated in a screw case 120 is heated to the melting point 250 ~ 270 ℃ range is sent to the extrusion head 130, the extrusion head 130 is heated to a temperature range of 280 ~ 290 ℃ again to the central extrusion hole Foaming is started in the extrusion die mold 140 via 141 to form the internal foaming layer 10, and the second extruder 200 is adjacent to one side of the first extruder 100 in parallel. The new resin or recycled resin (PE) raw material is placed through the raw material hopper 210, and the raw material introduced through the raw material hopper 210 is in the melting point 250 to 270 ° C. in the screw case 220 to which high heat is applied. The inner foam layer made of the central extrusion hole in the extrusion die 140 of the first extruder 100 described above through the side connection pipe 201 to the extrusion die mold 140 through the head 230 is heated ( 10) the upper skin layer 20a at both side positions of the inner foam layer 10 made at the central extrusion hole through the side connecting pipe 210 at the extrusion die 240 of the second extruder 200 at both side positions of the second extruder 200. And the bottom shell layer 20b is divided into to form a shell resin layer 20 which is supplied with molten resin and surrounds the outer edge of the inner foam layer 10 to obtain a flooring having a multilayer structure having a thickness of 10 to 20 cm. It has been applied in a configuration.

However, the international standard for export containers is, for example, 3 * 6 standard is 900mm * 1800mm thickness 28mm standard, and 4 * 8 standard is required as 1200mm * 2400mm thickness 28mm standard. The outer foam layer 10 was obtained through the first extruder 100 through the first extruder 100 and the outer resin layer 20 was obtained through the second extruder 200, thereby forming both outer edges of the inner foam layer 10. 20) If you want to produce a flooring product with a 28mm thickness as the international standard of container flooring material by performing the sizing (300) process, the crimping part 400 process and the drawing cutting part (500) process. Even if a container flooring product having a thickness of 28mm is obtained, if it is stored for 1 ~ 2 months, 0.1 ~ 0.5mm of thickness may be reduced due to shrinkage of the product, or it may not be delivered. 2 in In case of obtaining a container flooring product having a thickness of 8.5 mm, it was not possible to solve the problem that an error occurred in the actual delivery process, and in the case of delivery, the flooring material was warped in one side in the flooring product applied as a container flooring product. There has been a problem that the claim is raised.

Therefore, if the cost of manufacturing an extruded mold to obtain a finished product of such a large size is not only 1,200,000 but hundreds of millions of years of trial and error, there is a huge loss of property. Through the manufacturing process of the embodiment shown in FIG. 2 while experiencing an error, a synthetic resin sheet material having a multilayer structure with no fear of occurrence of warpage could be obtained.

2 is a view showing an application example of an extruder to obtain an extruded molded article having a three-layer structure by applying the technical idea of the present invention, the raw material composition to be injected into the raw material supply hopper 110 of the first extruder 100 Waste resins such as vinyl, which are discarded after being used in rural areas, are crushed to an appropriate size and are supplied to the raw material supply hopper 110 together with the raw materials such as foam materials and heated to a melting point of 250 to 270 ° C. in a screw case 120 to which high heat is applied. When it is sent to the extrusion head unit 130, the extrusion head unit 130 is heated to a temperature range of 280 ~ 290 ℃ again and the foaming is started in the extrusion die mold 140 via the central extrusion hole 141 as the inner foam layer The forming process of (10) is applied to the same manufacturing process as in the case of Figure 1, using a recycled waste resin raw material and wood powder is supplied from the first extruder 100 has a thickness of 18 ± 2㎜ Only inner foam layer 10 is obtained The inner foaming layer 10 is obtained by cutting the sizing 300, the pressing 400, the drawing 500, and the intermediate product, which is cut to a desired width and length, and then the second extruder 200 It is a technique for obtaining a container flooring material 30, which is a finished product wrapped around the outer edge of the inner foam layer (10) by the upper outer shell layer (20a) and the lower outer shell layer (20b) to be sent from the second extrusion die mold (240).

That is, the raw material hopper 210 of the second extruder 200 is a new resin or recycled resin (PE) raw material and the raw material introduced into the raw material hopper 210 is a melting point 250 ~ 270 in the screw case 220 is subjected to high heat The upper and lower resin extrusion holes 246a and 246b of the secondary extrusion die mold 240 through the side connection pipe 201 through the head portion 230 and the secondary extrusion die mold 240 through the head 230. Into the side resin pressure port (246a, 246b) at both side positions of the inner foam layer (10) flowing in the thickness of 18 ± 2 mm from the intermediate material input portion 245 of the central portion of the secondary extrusion die mold 240 through It spreads in a fan shape and wraps the outer edge of the inner foaming layer 10 with a thickness of 5 ± 1 mm and extrudes, forming the upper outer shell layer 20a and the lower outer shell layer 20b, and the overall thickness of the container flooring material is 28 ± 2 mm thick. Multi-layered synthetic resin plate that does not cause warpage during use through extrusion manufacturing process It confirmed that the number obtained is the complete invention.

By using the extrusion molding apparatus shown in Figure 2 for example 3 * 6 standard width * length * thickness of 900 * 1800 * 18 mm to explain the manufacturing process for obtaining the intermediate product of the inner foam layer (10) Although not shown in the drawing, the apparatus for shaping 300 performs shaping is preferably applied to increase the smoothness through vacuum suction means. Pressed roller-shaped presses 400a which are arranged at intervals of one or more such as pressurizing and secondarily shaping while passing through multiple stages and continuously may be used. Such presses 400a may be arranged on both sides of the upper and lower sides and driven by separate power. It is preferable that a pair of press rollers are made of a metal having excellent thermal conductivity, and the compactors 400a pass through a sizing 300a process to firstly form. The inner foaming layer 10 is appropriately pressurized the intermediate product to increase the density and at the same time to form a strong bonding force, the compressors (400a) from the front to the rear to gradually increase the pressing force applied to the intermediate product of the upper and lower The pressure roller spacing is adjusted to gradually increase the density of the internal components of the plate to the rear and pass through the presser 400a at the final stage, and a water cooling type cooling system is installed to perform the secondary shaping process and the cooling process. The configuration applied to perform the curing process is preferred.

In addition, as described above, the intermediate product is discharged through a complete hardening process of the unmolded product by the second shaping process and the water cooling method as well as the pressing action while passing through the pressing machine 400a. A drawer 500 that draws out the intermediate product discharged from the final end is installed in succession to draw out the intermediate product continuously, and a cutter is installed in the last stage to make the inner foam layer 10 intermediate product sheet to the desired standard. The internal foaming layer 10 is applied to the intermediate raw material injection portion 245 of the second extrusion die mold 240 of the second extruder 200 by cutting, and the outer edge of the internal foaming layer 10 is transferred to the second extruder 200. The finished product 30 shown in FIG. 4 can be obtained by wrapping the outer edge of the inner foam layer in the upper outer shell layer 20a and the lower outer shell layer 20b which are sent to the secondary extrusion die mold 240).

FIG. 3 is a schematic view showing only the main parts of the secondary extrusion die mold 240 used in the second extruder 200 to show the flow of the raw material resin in the form of an internal perspective, in order to apply the technical concept of the present invention. The die mold 240 may be provided as four mold plates divided into a first mold plate 241, a second mold plate 242, a third mold plate 243, and a fourth mold plate 244. The molten resin is applied between the first mold plate 241 and the second mold plate 242 to the upper resin extrusion hole 246a from the second extruder 200, and the second mold plate 242 and the second mold plate 242. Between the three mold plates 243 is provided with a structure having an intermediate raw material input portion 245, which is made of the intermediate product in the first extruder 100, and then cooled and standardized internal foam layer 10 is injected, the third mold Between the plate 243 and the fourth mold plate 244 is configured to be supplied so that the molten resin is supplied from the second extruder 200 to the lower resin extrusion hole 246b and the secondary The extrusion die mold 240 is supplied to the upper resin extrusion hole 246a and the lower resin extrusion hole 246b to the outer edge of the internal foaming layer 10 that is already formed and cooled when it is extruded while forming a multilayer structure in the extrusion die mold 240. The upper resin extrusion hole 246a and the lower resin extrusion hole by pushing or pulling the thickness adjusting adhesion bars 247a and 247b controlled by the thickness adjusting bolts 1 and 2 (248a and 248b) to adjust the thickness of the melted resin. While adjusting the melt flow rate of (246b), the outer edge of the center plate having the thickness of 18 ± 2mm with the predetermined thickness is extruded by wrapping the outer edge with the thickness of 5 ± 1mm and the total thickness of the container bottom is 28 ± 2mm. The finished product can be obtained by extruding into a standard product.

Figure 4 shows a container floor standard product provided by applying the technical idea of the present application, Figure 4a is a cargo for 18 ± 2mm thickness using a raw material mixed with the waste resin and wood powder for recycling from the first extruder (100) The second extruder 200 after obtaining the inner foam layer 10 as a middle product of the container flooring material as a middle product, and the intermediate product undergoes a full-stage extrusion process to obtain a shaped product through a sufficiently shaping process, a cooling and a rolling pressing process. The recycled or new resin supplied to the furnace is extruded to a thickness of 5 ± 1 mm on both sides of the inner foaming layer 10 and shows that the entire thickness of the container bottom can be provided as a final finished product which is provided as a 28 ± 2 mm thick standard product. Figure 4b is an inner foam layer from the first extruder 100 to the center plate of the container container flooring material with a thickness of 18 ± 2 mm using a raw material mixed with waste resin and wood powder for recycling When obtaining (10) to form a hollow portion 11 inside the foam layer to show that it can be applied to further reduce the weight of the flooring.

An embodiment of the technique for obtaining and applying an intermediate product of the inner foam layer 10 having the hollow portion 11 formed in FIG. 4B is described in the Applicant's Patent Application No. 10-1822104, "Extrusion for obtaining a synthetic resin plate member having a hollow portion. The apparatus and the hollow part obtained by using the same have been sufficiently described through the technology disclosed in "A synthetic resin plate member", and thus the description thereof is omitted.

In addition, the detailed description of the invention for the present application technology has been described in the center of the newly disclosed herein, in connection with the technology of obtaining a synthetic resin plate by using an extrusion mold Patent Application No. 10-1822104 of the applicant "synthetic resin formed hollow portion Extrusion apparatus for obtaining a sheet and a synthetic resin plate member having a hollow portion obtained using the same, Patent No. 10-1379284 "Extrusion molding apparatus having a die of a multi-layer extrusion structure and extrusion molding method of a synthetic resin plate using the same," Patent 10- 1166899 has been described in detail with the drawings, such as "extrusion molding apparatus having a die of a multi-layer extrusion structure and the extrusion molding method of a synthetic resin plate using the same" and the like will be omitted and the overlapping parts will be described mainly on the newly disclosed herein. .

10: inner foam layer 11: porous portion
20: outer shell layer 30: container flooring
100: first extruder 110: raw material supply hopper
120: screw case 130: extrusion head portion
140: primary extrusion die mold 141: central extrusion hole
200: second extruder 201: side connector
210: raw material input hopper 220: screw case
230: extrusion head 240: second extrusion die mold
241: first mold plate 242: second mold plate
243: third mold plate 244: fourth mold plate
245: intermediate material input part 246: side resin pressure port
247: thickness control contact bar 248: thickness adjustment bolt
300: sizing 400: crimping portion
500: drawing part 600: product feed roller
700: Product Storage

Claims (4)

In the manufacturing method of the cargo container flooring material having a standard product of 28 ± 2 mm thickness using a multi-layer synthetic resin sheet,
A first step of extruding step of obtaining a center plate of a container container bottomed material having a thickness of 18 ± 2 mm using a raw material mixed with waste resin and wood powder to be recycled from a first extruder;
When the central plate material obtained in the first step is introduced into the center of the second extruder, and the new resin is supplied from both sides of the outer edge of the central plate introduced into the second extruder, the new resin is extruded to a thickness of 5 ± 1 mm and is 18 ± 2 mm. A second step of extruding process of wrapping the outer edge of the central plate having a thickness with a new resin and exposing the entire thickness of the container bottom to a standard product having a thickness of 28 ± 2 mm;
Method for producing a container flooring material for cargo, characterized in that comprises a. The method of claim 1,
When the first step and the second step extrusion process is carried out continuously, after the cooling process is carried out after the first step extrusion process is carried out so that the second step extrusion process is carried out, characterized in that the manufacturing method of the cargo container flooring . In the cargo container flooring material consisting of a synthetic resin plate of a multi-layer structure and a standard product of 28 ± 2㎜ thickness,
From the first extruder, a center plate of 18 ± 2 mm thick cargo container bottom is obtained from raw materials mixed with recycled waste resin and wood powder, and then the center plate is introduced into the center of the second extruder. Resin is extruded to a thickness of 5 ± 1㎜ and wrapped around the outer edge of the center plate with a new resin resin is provided as a standard product of 28 ± 2㎜ thick characterized in that the flooring material for cargo. In the extrusion mold for obtaining a container container flooring material consisting of a standard product of 28 ± 2 mm thickness by using a synthetic resin sheet material of a multi-layer structure,
The extrusion die mold 240 is divided into a first mold plate 241, a second mold plate 242, a third mold plate 243, and a fourth mold plate 244, and the first mold plate 241 and the first mold plate 241. The molten resin is supplied and extruded with a thickness of 5 ± 1 mm between the two mold plates 242, and the center plate is 18 ± 2 mm thick between the second mold plate 242 and the third mold plate 243. The molten resin is supplied and extruded between the 3 mold plates 243 and the 4th mold plate 244 to a thickness of 5 ± 1 mm to wrap the outer edge of the center plate with the molten resin to obtain a cargo container bottom having a thickness of 28 ± 2 mm. Extrusion mold for cargo container flooring, characterized in that the acting.

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