Anti-slip structure for drums loaded on pallets, and method for loading drums.

Abstract

To prevent a drum can loaded on a deck surface of a pallet from slipping off a pallet.SOLUTION: A non-slip structure (1) is provided which is placed on a deck surface (3) of a pallet (2), and in which a first corrugated board (4), a non-slip sheet (5), a curing sheet (6), and a second corrugated board (7) are laminated in this order from the deck surface (3) side. A drum can (8) is loaded onto the non-slip structure (1).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an anti-slip structure for preventing a drum can loaded on a deck surface, which is the upper surface of a pallet, particularly a drum can filled with sludge containing an acidic liquid, from slipping off the deck surface of the pallet, and a method of loading a drum can onto the pallet.

Background Art

[0002] In the sulfuric acid production process of a copper smelter, there are a dust washing and recovery process for smelting exhaust gas containing SO2 gas. The sludge containing the acidic liquid recovered in this washing and recovery process is carried out of the system. At this time, after dehydrating the sludge, the dehydrated sludge is filled into a drum can, and a plurality of drum cans (for example, four drum cans) are loaded on the deck surface of a pallet, and the pallet loaded with the drum cans is carried out by a transport container.

[0003] Since the deck surface of the pallet on which the drum can is loaded is composed of a flat surface, the loaded objects such as drum cans are likely to slip. Therefore, during the process of carrying the sludge out of the system, when loading with a forklift, during transportation by a transport container, or when unloading with a forklift, the drum can may slip off the pallet due to impact or the like. Also, at this time, the bottom of the drum can may be damaged, and the sludge wet with the acidic liquid may leak from the bottom, contaminating the inside and outside of the transport container. Thus, there are safety and environmental risks in carrying out the sludge containing the acidic liquid using a drum can.

[0004] In contrast, Japanese Patent Publication No. 2001-130571 discloses a pallet in which grooves are formed on the deck surface for fitting ribs protruding from the bottom of drums. Furthermore, Japanese Patent Publication No. 2009-196663 discloses a pallet in which, in each section of the deck surface where drums are loaded, a virtual circle is drawn with a radius equal to the radius of the drum, centered approximately at the center of the section, and an outer anti-slip material is provided that spans the virtual circle and extends both inside and outside the virtual circle at positions corresponding to approximately half the distance from each of the two sides of adjacent sections across the corners of the deck. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-130571 [Patent Document 2] Japanese Patent Publication No. 2009-196663 [Overview of the project] [Problems that the invention aims to solve]

[0006] The technologies described in Japanese Patent Publication No. 2001-130571 and Japanese Patent Publication No. 2009-196663 are considered to be able to effectively prevent drums from sliding off the deck surface of a pallet to a certain extent. However, providing such an anti-slip structure for drums on the pallet side presents the problem of requiring the effort of processing the pallet. In addition, in order to prevent the processed pallets from being mixed with other pallets, it becomes necessary to prepare a separate pallet storage area for processed pallets and to return the processed pallets to the dust washing and recovery process. Furthermore, the technology of providing an anti-slip structure for drums on the pallet side also presents the problem of requiring the effort of positioning the drums in a predetermined position on the deck surface of the pallet. Moreover, although inexpensive recycled drums are used for sludge removal so that they can be used as disposable items, the bottom surfaces of these recycled drums may be deformed into an oval shape or other shapes, and there is a problem that the anti-slip structure for drums on the pallet side cannot be applied to recycled drums with such deformed bottom surfaces.

[0007] The present disclosure aims to provide a drum anti-slip structure that can prevent drums from sliding off the deck surface of a pallet due to impact or other factors during the process of unloading sludge containing acidic liquids, while using a general-purpose pallet with a flat deck surface.

[0008] Furthermore, this disclosure aims to provide a means to effectively prevent a drum from sliding off the pallet deck due to impact during transport or delivery, causing damage to the bottom of the drum, and leaking sludge wet with acidic liquid from the bottom, thereby contaminating the inside and outside of the transport container. [Means for solving the problem]

[0009] An anti-slip structure for drums stacked on the deck surface of a pallet, according to one aspect of the present disclosure, is placed on the deck surface of the pallet. The anti-slip structure is characterized by being constructed by stacking a first corrugated cardboard, an anti-slip sheet, a protective sheet, and a second corrugated cardboard in that order from the deck surface side.

[0010] Preferably, the protective sheet has a vertical width greater than the vertical width of the deck surface and a horizontal width greater than the horizontal width of the deck surface. That is, the protective sheet has an outer peripheral portion that is rolled up and fixed to the side of the drum can that is stacked on top of the second cardboard. In this case, preferably, the first cardboard, the anti-slip sheet, and the second cardboard have a vertical width and horizontal width that are the same as or slightly smaller than the vertical width and horizontal width of the deck surface.

[0011] The protective sheet is preferably made of a transparent nylon sheet.

[0012] A method for loading drums according to one aspect of this disclosure is: A step of placing an anti-slip structure according to one aspect of the present disclosure on the deck surface of a pallet, The process of stacking drums on the aforementioned anti-slip structure, and, The process involves rolling up the portion of the protective sheet that is located outside the drum and securing it to the side of the drum, It is characterized by having the following features.

[0013] In the drum stacking method described above, if multiple drums are stacked on the deck surface of the pallet, it is preferable to include a step of securing the multiple drums to each other with cable ties.

[0014] The anti-slip structure and loading method of this disclosure can be implemented by appropriately combining the configurations of each of the above-described embodiments to the extent that no inconsistencies arise. [Effects of the Invention]

[0015] By applying the anti-slip structure for drums according to one aspect of this disclosure, even when using a general-purpose pallet with a flat deck surface, it is possible to effectively prevent drums from sliding off the deck surface of the pallet due to impacts during transport or delivery in the process of unloading sludge containing acidic liquids.

[0016] Moreover, by applying the method for loading drum cans according to one aspect of the present disclosure, which uses the anti-slip structure of drum cans according to one aspect of the present disclosure, even if the drum can accidentally slips off the deck surface of the pallet due to impacts during transportation or shipping, the bottom of the drum can is damaged, and sludge wet with acidic liquid leaks, the curing sheet that constitutes the anti-slip structure can effectively prevent the sludge from contaminating the inside and outside of the transportation container.

[0017] Thus, the technology of the present disclosure can significantly reduce safety and environmental risks during the process of carrying out sludge containing acidic liquid, and therefore its industrial value is extremely high.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is a perspective view conceptually showing the anti-slip structure of a drum can according to an example of an embodiment of the present disclosure, together with a pallet and a drum can. [Figure 2] FIG. 2 is a front view of the same configuration as FIG. 1 seen from the horizontal direction. [Figure 3] FIG. 3 is a perspective view similar to FIG. 1 showing a state in which the outer peripheral portion of the curing sheet constituting the anti-slip structure of the drum can is rolled up and fixed to the side surface of the drum can from the state of FIG. 1. [Figure 4] FIG. 4 is a front view of the same configuration as FIG. 3 seen from the horizontal direction.

Modes for Carrying Out the Invention

[0019] Hereinafter, the anti-slip structure of a drum can according to an example of an embodiment of the present disclosure and the method for loading a drum can using the anti-slip structure will be described. However, the content of the present disclosure is not limited to these contents, and improvements and changes can be made as appropriate according to the need, and these improvement examples and change examples are also included in the content of the present disclosure.

[0020] <Anti-slip Structure of Drum Can> Figs. 1 to 4 are perspective views and front views schematically showing the anti-slip structure of the drum can and the method of loading the drum cans in this example. The anti-slip structure (1) of the drum can in this example is placed on the deck surface (3) of the pallet (2). The anti-slip structure (1) can be composed of stacking the first corrugated board (4), the anti-slip sheet (5), the curing sheet (6), and the second corrugated board (7) in this order from the deck surface (3) side.

[0021] The type of the drum can (8) used in this example is arbitrary, but usually, a 200L drum can, which is widely used in this field, can be cited. Also, in the sludge discharging process, since the container may be damaged by the sludge, it is preferable that the container for discharging the sludge can be disposable. A recycled drum can made of metal with appropriate strength and available at a low cost due to a large circulation volume is often used. The drum can (8) used in this example includes such recycled drum cans.

[0022] Also, the type of the pallet (2) used in this example is arbitrary, and metal, synthetic resin, or wooden pallets can be used. In this example, a general-purpose pallet with a flat deck surface can be used, but the technology of this disclosure can also be applied to a pallet with an anti-slip structure provided on the deck surface. Usually, a total of 4 drum cans (8) can be loaded on the deck surface (3) of the pallet (2). However, depending on the size of the deck surface (3) of the pallet (2) and the size of the drum can (8), it is also possible to load more than 4 drum cans (8). Also, even if there is a margin on the deck surface (3), it is acceptable to load only 1, 2, or 3 drum cans (8).

[0023] The first corrugated cardboard (4) and the second corrugated cardboard (7) have the function of preventing damage to the anti-slip sheet (5) and protective sheet (6) when loading drums. More specifically, the first corrugated cardboard (4) has the function of preventing unevenness or splinters on the surface of the pallet (2), or dirt or gravel on the pallet (2), from getting embedded in the anti-slip sheet (5) and protective sheet (6). The second corrugated cardboard (7) has the function of allowing the ribs around the bottom of the drum to get embedded, thereby holding the drum (8) in place. Commonly used corrugated cardboard sheets can be applied to the first corrugated cardboard (4) and the second corrugated cardboard (7).

[0024] The anti-slip sheet (5) has the function of increasing friction between the first corrugated cardboard (4) and the protective sheet (6), thereby preventing the drum can (8) from sliding off the deck surface (3) of the pallet (2) due to impact. The anti-slip sheet (5) can be made of, for example, a nonwoven fabric sheet made of a highly elastic material such as natural rubber, synthetic rubber (chloroprene rubber, isoprene rubber, butadiene rubber), silicone rubber, or various types of fluororubber, as well as a nonwoven fabric sheet made of polyethylene, polyvinyl chloride, polyester, a blend of polyester and rayon, or a blend of cellulose fibers and polyester. It is also possible to use an anti-slip sheet (5) that uses the nonwoven fabric sheet as a base material and has an anti-slip coating made of silicone or the like formed on one or both sides.

[0025] The protective sheet (6) has the function of protecting the pallet (2). Specifically, the drum (8) may corrode due to acidic liquid seeping out from the sludge inside the drum (8), or the drum (8) may wear down due to the sludge, causing small holes to form on the bottom and sides of the drum (8), especially on the bottom. In this case, the acidic liquid may seep out from these small holes on the bottom and sides of the drum (8). Furthermore, due to impacts during the transport process, these small holes may cause larger gaps to form on the bottom and sides of the drum (8), and the sludge itself, which is wet with acidic liquid, may leak out. General pallets have many irregularities of various sizes, such as forklift tines and pores in the wood, so if sludge or acidic liquid adheres to them, it will take a great deal of effort to restore them. In contrast, by using an acid-resistant material for the protective sheet (6) that prevents the penetration of sludge and acidic liquids, even if sludge or acidic liquids adhere to it, they can simply be washed off the protective sheet (6). Therefore, the protective sheet (6) is preferably thin, lightweight, and flat, and with such a shape, it is possible to lift the protective sheet (6) and wash off any attached substances at any desired location.

[0026] As the protective sheet (6), for example, protective sheets made of nylon, polyethylene, polyvinyl chloride, or a durable composite material such as tarpaulin can be used. From the viewpoint of improving visibility when checking for sludge leakage from the bottom of the drum (8), it is preferable that the protective sheet (6) be transparent. Furthermore, from the viewpoint of preventing sludge leakage from the protective sheet (6), it is preferable to use a protective sheet made of nylon with excellent chemical resistance.

[0027] In this example, the protective sheet (6) has a length greater than the vertical width of the deck surface (3) of the pallet (2), and a width greater than the horizontal width of the deck surface (3) of the pallet (2). This makes it possible to roll up the portion of the protective sheet (6) that is outside the drum can (8), i.e., the outer perimeter of the protective sheet (6), after the drum can (8) has been loaded onto the deck surface (3) of the pallet (2), as shown in Figures 3 and 4, and fix it to the side of the drum can (8). With this configuration, even if sludge leaks outward from the side of the drum can (8), it is possible to effectively suppress further leakage of sludge from the protective sheet (6). In addition, if there is deposits on the surface or back of the protective sheet (6), it is possible to narrow down whether the source is on the pallet (2) or not, depending on the location of the deposits. Furthermore, the size of the protective sheet (6) is preferably such that, when rolled up, it can enclose at least 1 / 10 of the height of the drum (8), more preferably it can enclose about 1 / 5 to 1 / 2 of the height of the drum (8), and even more preferably it can enclose about 1 / 4 to 1 / 3 of the height of the drum. Alternatively, in comparison with the length and width of the deck surface (3) of the pallet (2), the length and width are preferably about 1.2 to 2.0 times the length and width of the deck surface (3), and more preferably about 1.3 to 1.5 times the length and width of the deck surface (3).

[0028] While a thin protective sheet (6) is preferable for ease of rolling up, it is preferable to double it from the viewpoint of strengthening leakage prevention. Furthermore, in this case, it is even more preferable that the protective sheet (6) consists of two protective sheets and another anti-slip sheet inserted between them.

[0029] The length and width of the first corrugated cardboard (4), the anti-slip sheet (5), and the second corrugated cardboard (7) are arbitrary, but it is preferable that they be the same as or slightly smaller than the length and width of the deck surface (3) of the pallet (2). However, even if they are smaller than the length and width of the deck surface (3), it is preferable that they are large enough to accommodate the entire drum can (8) (or all drum cans (8) if multiple drum cans (8) are loaded) placed on the anti-slip structure (1).

[0030] <Drum stacking structure> In this example of drum stacking method, first, the anti-slip structure (1) is placed and constructed on the deck surface (3) of the pallet (2) by stacking the first corrugated cardboard (4), anti-slip sheet (5), protective sheet (6), and second corrugated cardboard (7) in that order.

[0031] Next, using conveying equipment such as a drum lift, drums (four drums in this example) filled with sludge containing an acidic liquid are loaded onto the anti-slip structure (1) placed on the deck surface (3) of the pallet (2).

[0032] Furthermore, the portion of the protective sheet (6) of the anti-slip structure (1) that is on the outside of the placed drum (8) is rolled up, and the rolled-up portion of the protective sheet (6) is fixed to the side of the drum (8) using any fixing tape (9) or the like. In other words, an enclosure is formed consisting of the portion of the protective sheet (6) that is laid under the drum (8) (bottom portion) and the portion that is fixed to the side of the drum (8) (peripheral wall portion). This makes it possible to retain the sludge inside the enclosure when sludge leaks from the bottom of the drum (8).

[0033] In this example, since multiple drums (8) are stacked on the deck surface (3) of the pallet (2), cable ties (10) are used to secure the drums (8) to each other in order to prevent them from tipping over during transport.

[0034] Finally, a packing sheet of polyvinyl chloride or polyethylene (not shown) is wrapped around the pallet (2) and the drum (8) to secure the drum (8) to the pallet (2).

[0035] The pallet (2) on which the drums (8) are placed is loaded into the transport container using transport equipment such as a forklift. Similarly, at the destination, the pallet (2) can be unloaded from the transport container using transport equipment such as a forklift, and then the packaging can be removed. [Examples]

[0036] Wooden pallets (1150mm x 1150mm x 150mm) were used as pallets.

[0037] As an anti-slip structure, the following materials were used: a first layer of corrugated cardboard (1100mm x 1100mm), a polyethylene anti-slip sheet (1100mm x 1100mm), a transparent nylon protective sheet (1800mm x 1800mm), and a second layer of corrugated cardboard (1100mm x 1100mm).

[0038] A non-slip structure was constructed on the deck surface of the pallet by sequentially placing the first cardboard, anti-slip sheet, protective sheet, and second cardboard on the deck surface.

[0039] Four 200L drums filled with sludge containing an acidic liquid were sequentially loaded onto a non-slip structure using a drum lift. The drums were then secured to each other with cable ties, and finally, packaging vinyl sheets were wrapped around the pallet and drums.

[0040] We repeatedly loaded pallets containing drums into transport containers using a forklift, transported them, and unloaded them at the destination using a forklift. In all of these processes, the drums never slid off. [Explanation of Symbols]

[0041] 1 Anti-slip structure 2 pallets 3. Deck side 4. First cardboard box 5. Anti-slip sheet 6. Protective sheet 7. Second cardboard box 8 drums 9. Fixing tape 10 Cable ties

Claims

1. A non-slip structure for drums stacked on a pallet, wherein the structure is placed on the deck surface of the pallet and is constructed by stacking a first corrugated cardboard, a non-slip sheet, a protective sheet, and a second corrugated cardboard in that order from the deck surface side.

2. The anti-slip structure according to claim 1, wherein the protective sheet has a vertical width greater than the vertical width of the deck surface and a horizontal width greater than the horizontal width of the deck surface.

3. The anti-slip structure according to claim 1, wherein the protective sheet is made of a transparent nylon sheet.

4. A step of placing the anti-slip structure described in claim 2 on the deck surface of the pallet, The process of stacking drums on the aforementioned anti-slip structure, and, The process involves rolling up the outer peripheral portion of the protective sheet that is located outside the drum and securing it to the side of the drum, A method for loading drums, which includes [a specific feature / feature].

5. The drum stacking method according to claim 4, further comprising the steps of stacking a plurality of drums on the deck surface of the pallet and securing the plurality of drums to each other with cable ties.

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