KR950005126B1 - Heavy-duty shipping container for flowable bulk materials - Google Patents

Abstract

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Description

[Name of invention]

Heavy Shipping Containers for Transporting Liquid Loads

[Brief Description of Drawings]

1 is a perspective view showing a portion of the shipping container according to the present invention in a broken cross section.

2 is a cross-sectional view of a shipping container.

3 is an enlarged cross-sectional view of the circular portion of FIG.

4 is a longitudinal sectional view of the bottom portion of the upper side and the lower side of the shipping container of FIG.

5 is an inner sleeve development of FIG.

6 is a view of the outer sleeve of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is a perspective view of the outer sleeve and the bottom wing portion of the shipping container with a portion shown in cross section.

9 is a disassembled parts arrangement diagram at the time of shipment using a shipping container.

10 is a cross-sectional view showing the upper end state of the inner sleeve and the outer sleeve before the contents are filled in the shipping container.

11 is a longitudinal sectional view of a corner portion in which the side portion and the bottom surface in contact with the contents filled in the shipping container.

12 is a longitudinal cross-sectional view of the corner portion with the bottom plate removed in FIG.

13 is a bottom view of a shipping container.

Detailed description of the invention

[Background of invention]

The present invention provides a heavy material for transporting a fluid load having a volume of at least 55 gallons and a weight of at least 450 pounds, such as fluids, dry powders, granular materials, semi-solid materials (eg grease, dough, adhesive liquids) or high viscosity fluids. It relates to a shipping container.

In general, shipping containers for the transport of fluent materials are made to withstand special weights due to the high specific gravity of the material shipped, and also to prevent damage caused by unevenness or rotational forces due to the flow of contents generated during handling or transportation of the container. It must be designed. Microscopic holes or cracks in the container can be a source of enormous loss of fluid.

Thus, heavy loading containers containing fluids in excess of manual capacity are typically mounted on pallets and operated using a machine in a forklift or manual lift truck, and various types of containers and container materials are designed for the transport of fluids. Has been.

For example, single-ply corrugated cardboard boxes have been used for containers that are inexpensive and lightly processed. If necessary, these boxes are either waxed or plastic bags are used together, but the volume and weight of the load In some cases, the material loaded in the container increased the pressure and caused the container to expand on the sides, making it difficult to load similar containers.

This expansion of the container side reduces the force of the strut given to the single-ply corrugated container, making it unsuitable for heavy weight applications. Corrugated cardboard is generally applied within the container industry as paper sheets, which have a wide range of materials and are made of paper pulp or piles of paper. Paper plates with flat or corrugated materials are made of corrugated cardboard. Cardboard used in the packaging industry or in this specification and claims is composed of paper sheets with various combinations of corrugated papers between the papers. It helps to ensure the robustness of

In general, corrugated cardboard is used to make boxes of a firmer and larger size than other types of paperboard to maintain angles and have substantial weight bearing. The use of two or three corrugated boards in the construction of shipping containers brings many direct advantages to the packaging and transportation of heavy materials.

Two-ply corrugated cardboard is made of two corrugated cardboard sandwiched between three flat sides or long paper, and three-ply corrugated cardboard is made of three corrugated cardboard sandwiched between four flat sides or long paper, especially three-ply corrugated cardboard. Its strength and strength are comparable to wood and have the advantages of cost and cushioning power not found in wooden containers, and also have great holding power compared to other cardboard.

The holding force of the triple corrugated container supports the container package without excessive torsion or distortion of the vertical wall, and exerts a strong force against tearing. Corrugated cardboard shipping containers having a multi-faceted tubular member, or similar general containers that reinforce the inner side to increase strength are known from US Pat.

In order to make a multi-faceted corrugated cardboard container, a main groove line is formed in the cardboard to bend the cardboard along the angle of each side of the container. However, as the number of the main groove lines increases, the stability of the container sidewall tends to decrease significantly. The main homeline of the container helps to fold it flat when not in use.

Cylindrical containers have long been known as the most effective shape for storing fluids or dry flowable materials.

However, the cylindrical type container using cardboard is a typical 55 gallon drum-shaped drum made of spiral paper, and its use has been limited due to its small capacity. The production of a large-capacity container with such a type requires excessive materials and manufacturing costs. The economic aspect and impossibility of the manufacturing machine due to the unrealized.

The drum is also sturdy but cannot be folded flat when not in use. Until now, this type of drum is still difficult to handle, transport and store because it is transported after being placed in a place and stored empty or already made at the user's location. Most importantly, the construction, performance or handling requirements of drum barrels ranging from 110 gallons to 380 gallons exceed industrial efficiency for commercial production where possible.

In addition, high-strength reinforced plastic or iron plate drums used as alternatives are expensive and do not increase their use in small storage spaces and presently present problems due to various disposal options.

Thus, despite the effects of columnar containers, corrugated cardboard has generally not been used as a cylindrical container material. Corrugated boards have a cylindrical shape, especially without the substantial loss of the main grade of corrugated cardboard caused by this fluid pressure in the multiple layers of high grade loading capacity or weight bearing capacity and in the volume or weight of a fluid of 110 to 380 gallons or the same flowable solid. It is impossible to be made with.

[Summary of invention]

According to the present invention, the inner bottom surface of the outer sleeve is covered with a bottom plate on the inner bottom surface of the outer sleeve together with a cylindrical inner sleeve made of triple corrugated cardboard and a multi-wall corrugated outer sleeve forming a polygonal cross section so that the inner sleeve is fitted. Therefore, before the contents are filled in the container, the upper side of the inner sleeve protrudes slightly above the outer sleeve, and after the contents are filled, the inner sleeve is supported by the force acting on the inner sleeve. It is a configured heavy container for shipping.

The inner surface of the inner sleeve has many grooves in the same longitudinal direction as the inner sleeve, that is, in the same direction as the direction of travel such as a tube or corrugated bone. The outer sleeve is as much as possible corrugated board and has an octagonal cross section. The inner sleeve is cylindrical formed with single, double or triple corrugated boards, and the grooves are formed with sparse grooves at intervals of 1 inch to 6 inches to facilitate bending.

The outer sleeve of the container has a bottom wing made of a single layer of corrugated cardboard, support means such as a bottom plate laid on the bottom wing, and a lid for opening and closing the container.

The shipping container according to the present invention is designed to carry a flowable material exceeding a volume of at least 55 gallons and a weight of 450 pounds, and the material or manufacturing cost per unit volume is low when compared to known steel sheets or plastic drums. In addition, it takes up less space in transportation and can be folded flat when not in use, and it is possible to recycle materials and at the same time, there is no pollution problem when disposing.

Detailed description of the invention

1, 2 and 3 show the shape of the container according to the present invention, the shipping container 10 is a light cylindrical inner sleeve 12 made of multiple layers of corrugated cardboard and also a multi-layered corrugated container. It consists of the outer sleeve 14 of shape. The inner sleeve 12 is made of a multi-layered corrugated board and can be used in single or double layers depending on the application state.

In this invention, this inner sleeve 12 was comprised by the corrugated board of three layers like FIG. Particularly high grade double or triple corrugated boards used to make the inner sleeve 12 show a significant increase in storage capacity compared to conventional solid fibers or single layer inner sleeves.

The flat plate 11 as shown in FIG. 5 first has two main grooves 13 and 17 which are opposite to the inner sleeve 12 when assembled to store the contents. In the dismantled state, which is located in the direction and does not store objects, it acts as a folding part so that it can be folded flat.

This flat plate 11 is made circular as a bending machine apparatus such as a sheet metal roller. In addition, between the wrinkled radius of curvature of the plate (11) formed a plurality of small grooves (75) in the transverse direction with a space of approximately 1 inch to 6 inches to form a cylindrical inner sleeve for containing fluid or fluid solid material If you do, it will help you achieve a nearly complete prototype. After the inner sleeve forms a cylinder, the ends of the plates are overlapped and bonded together.

As shown in the enlarged cross-sectional view of FIG. 3, the plurality of small grooves formed on the inner sleeve 12 surface of the cardboard are different from the mechanical grooves 13 and 17 that are made to be folded when the inner sleeve 12 is not used. Personality is different

In other words, there are important differences between the grooves 75 and the mechanical grooves 13 and 17, which help to maintain a circular shape when installing the inner sleeve, for example, when making and using several mechanical grooves. The result is a weakening of the inner sleeve.

The outer sleeve 14 of the present invention has an octagonal barrel shape having an octagonal cross section. The outer sleeve 14 is made of corrugated cardboard or a visual plate 16 of a similar material as shown in FIG. 6, and the square plate is cut according to a well-known technical method, and the grooves are formed into square wall surfaces 18, 20 ( 22, 24, 26, 28, 30, 32 and folding grooves 34, 36, 38, 40, 42, 44, 46 and joint surface 48 between the square wall surface ) And the folding groove 50 formed between the square wall surface (32).

Bottom wings 52, 54, 56, 58, 60, 62, 64, 66 extend from one side of the rectangular wall surface to a width of approximately 1 inch to 8 inches from the bottom line of the wall. The bottom line is folded grooves 51, 53, 55, 57, 59, 61, 63, 65 are formed. The container side wall is made of three layers of corrugated board, in which each convex portion of the corrugated boards 70, 72, 74 is bonded to each other with the flat plates 76, 78, 80, 82, as shown in FIG.

In addition, as shown in FIG. 8, the bottom wing made of one layer of corrugated cardboard is formed by extending one of the three layers of corrugated cardboard of the side wall. This bottom wing is made as a triple corrugated cardboard box manufacturing machine, a method well known in the corrugated container making industry.

This square plate 16 is folded in an octagon according to the folding groove as shown in the cross-sectional view. The joining surface 48 overlaps the face of the plate 76 and is firmly joined in accordance with known methods to make the outer sleeve 14. The bottom wings fold up properly with each other according to the folded outer sleeve 14. The use of bottom wings helps to preserve the shape of the container. It is also possible to cover the floor with a bottom lid similar to the top lid without using the bottom wing, but it is difficult to expect satisfactory results. The inner sleeve 12 does not have a bottom wing. The bottom plate 98 has the same octagonal cross-sectional shape as the outer sleeve 14 and the bottom wings 52, 54, 56, 58, 60, 62 and 64 of the outer sleeve 14 are folded. It is laid upwards.

In particular, each edge surface of the bottom plate 98 also serves to support the side of the outer sleeve (14). The inner sleeve 12 is in contact with the central portion of each wall surface of the outer sleeve 14 and is inserted into the outer sleeve 14 and the inner sleeve 12 which is not in contact with the wall near the corners formed by contacting each side wall of the outer sleeve 14. Together with the space 19 is formed. The inner sleeve 12 is placed on the bottom plate 98 so that the inner sleeve 12 protrudes upwards to the thickness of the bottom plate 98 than the outer sleeve 14 to have a shape as shown in FIG.

The bottom plate 98 is made of a material free of change in shape such as a bottom wing. Therefore, initially the inner sleeve 12 is projected upward than the outer sleeve 14, but as the inner sleeve 12 is lowered under the influence of the contents as the inner sleeve 12 is filled with the bottom plate 98 and The lower corners adjacent to this shape have the same shape as in FIG. 11.

Such a shape serves to minimize the damage of the fluid bag embedded in the inner sleeve 12. If the bottom plate 98 is absent as shown in FIG. 12, the inner sleeve 12 is directly connected to the bottom wing. This affects the container damage.

In addition, when the inner sleeve 12 is assembled so as not to protrude above the outer sleeve 14, the inner sleeve 12 is lowered while applying force to the bottom plate of the inner sleeve 12 and the outer sleeve 14 When loading the container with the upper ends to generate a height difference, the container located downward becomes a cause of being crushed or damaged under load from the upper container.

In general, the flowable material is contained in a bag such as a plastic bag and embedded in the inner sleeve, where the bagged material is stressed to the bottom plate and the bottom of the inner sleeve.

Therefore, the inner sleeve protruded in consideration of such a magnitude of stress above the outer sleeve is lowered under stress to change to the same height as the outer sleeve.

The outer sleeve 14 of the present invention has an octagonal cross-sectional shape, but can be modified into a polygon. Container 10 has an octagonal lid 90, such as the cross-sectional shape of the outer sleeve, the lid 90 is formed with a border 92 that can appropriately cover the side surface of the outer sleeve (14).

In addition, the lid 90 is also formed of a single corrugated cardboard plate serves to distribute the loading load acting on the inner sleeve and the outer sleeve.

9 shows an exploded view of parts during shipment assembly according to the invention. A commercial separation pallet 96 is installed below the container so that the container can be transported by forklift or manual lift truck. The thin bag 100 made of plastic in the inner sleeve 12 is used in a leakproof container to prevent leakage that may occur in the gap between the bottom wing and the bottom plate. The thin bag 100 suitable for this is made of a polyethylene film or similar flexible plastic film.

The bottom wings overlap each other, as shown in FIG. 12, and the bottom plate that is folded and laid thereon supports the bag 100 in the inner sleeve and protects the bag 100 from nails or other debris protruding from the pallet top surface. It plays a role. In addition, the compressible cover plate 102 is installed between the thin bag 100 and the lid 90 to prevent the cargo from flowing out or to give a space that is not full to prevent the contents from rocking.

In particular, the cover plate 102 is suitable for reducing or preventing the fluctuation of the fluid occurring during the transportation of the fluid. However, compression of the cover plate 102 should allow for some expansion of the fluid and pressure of the liquid to prevent the pressure of the fluid from being biased towards the wall or bottom of the container.

The cover plate 102 is made of triple corrugated cardboard or polyether foam. The outer surface of this cover is supported by the inner surface of the inner sleeve 12. The packing iron strip 84 binds the upper shipping container with the pallet 98. In order to prevent breakage of the lid 90, a U-shaped iron plate brace is installed on the lid 90.

The brace 86 is a flat strip, which has legs covering the rim of the lid, and is formed wider than the width of the packing iron strip 84 to disperse the force of the string generated in the shipping container. In addition, the surface of the brace 86 may have a projection to prevent slipping of the packing steel strip.

The bottom wing 62 prevents warpage and torsion occurring at the bottom of the outer sleeve 14 according to the weight of the storage material acting on the bottom plate 98 and the packaging force. The plastic bag is made of a bottom faucet 88, which is already known in the manufacturing industry, protrudes outward through a groove formed in the outer sleeve and the inner sleeve, and discharges the goods contained in the bottom faucet 88 and the thin bag 100. It is interconnected with the spout.

Example 1

We have made a shipping container according to the present invention. The outer sleeve is triple 1500 AAA grade cardboard with octagonal cross section, 40 inches wide and 44 inches high. The inner sleeve is also made of triple 1500 AAA corrugated cardboard, which is cylindrical in shape with several grooves inside. The outer sleeve has a layer of bottom wings. The octagonal bottom plate is made of three layers of 0900 AAA grade corrugated cardboard with a single lid covering the outer sleeve. A thin plastic bag filled with 220 gallons of water was placed in a container. The cover plate between the thin bag and the lid is made of triple 0900 AAA grade cardboard.

Three 3 / 4-inch by 0.020-inch steel bands were used on 44 x 44-inch wooden pallets to package the container. Two were packed in the same direction and one was wrapped to intersect with the two strings. Each iron strip rests on a 5 inch wide brace with 3 inch legs. This container is tested as ASTM standard D-4169 and then as a method according to cycle number 11. The water in the thin bags did not leak after the complete test procedure.

(1) Drop test

The container was raised 6 inches with a forklift, dropped on one side of the concrete surface, and dropped on the other side. Water was not leaked.

(2) vertical vibration test

Raise the container on the vertical vibration tester that can cause 1-inch vibration deviation, and perform the vibration test for 40 minutes at low or medium speed vibration, similar to the transportation status of the truck, and then prevent it from moving horizontally again. It carried out for 40 minutes in the conditions of.

The water did not leak after this vertical vibration test.

(3) rotary vibration testing machine

The container was placed on a rotary vibration tester that could generate a 1-inch vibration deviation, and after 20 minutes of vibration at a frequency of 235rpm in a state similar to the rotational shape generated when the train was transported, it was rotated at an angle of 90 ° and repeated again. Did.

(4) impact test

The impact tester placed one container in an inclined state such that cargoes collided with each other during transportation, and then collided one container once at 4 mph and then twice at 6 mph, but water did not leak.

Example 2

After making the shipping container according to the present invention, a plastic thin bag was filled with 220 cal of water and placed in the container. The container was kept for 72 hours at 90 degrees Fahrenheit and 90% relative humidity, and then left for 72 hours in a compressed package. In this state, a force was applied at a rate of 0.5 inches per minute downward from the top of the container until the container broke. The container did not break until it reached 8,600 pounds.

Example 3

The container was maintained at a temperature of 73 degrees Fahrenheit and a relative humidity of 50% for 72 hours, and then put into a container filled with 220 gallons of water in a plastic thin bag, and applied in the same manner as in Example 2. The container did not break until it reached 18,000 pounds. This is a special shape for the container of the present invention that fills the flowable material without expansion in the inner sleeve 12, and the effect of the inner sleeve 12 in the form of a circular cross section to withstand the pressure generated from the flowable material to prevent expansion on the wall. to be. The influence of the height difference between the inner sleeve and the outer sleeve of the container on the container was examined by the following examples.

Example 4

Insert the inner sleeve into the outer sleeve so that the inner sleeve and the outer sleeve have a certain height, assemble the contents, pack it, and load it for about a week. As a result, the top of the outer sleeve is crushed about 1/8 inch or more and the bottom The plate was damaged.

Therefore, in the container of the present invention, since the inner sleeve protrudes upward from the outer sleeve at the beginning, when the inner sleeve is lowered by the force acting on the inner sleeve even after packing, the upper surfaces of the inner sleeve and the outer sleeve are the same. This prevents excessive deformation of the container.

According to Example 4, the result of experimenting a container having a bottom plate of a triple corrugated board and a single bottom wing is as follows.

Example 5

Three different containers were filled with contents and three containers each were loaded for three weeks. At this time, the height of the inner sleeve protruded above the outer sleeve was set to 5/16 inches, 7/16 inches, 9/16 inches, respectively. The test found that the inner sleeve of the container with a 5/16 inch height difference was changed to the same height as the outer sleeve.

As a result, at the time of initial assembly, the protrusion height of the inner sleeve with respect to the outer sleeve was set to 0.3125 inches or more and 0.625 inches or less. For reference, the specifications for the 220 gallon container are as follows (the units are all in inches).

Inner height of outer sleeve 44.0000

Bottom plate thickness 0.5625

Bottom wing thickness * 2 (0.1875 * 2) 0.3750

Inner sleeve height 43.3750

Dil height of inner sleeve to outer sleeve at initial condition 0.3125

The outer sleeve 14 is made of two or three layers of corrugated cardboard to increase the allowable cushioning pressure when packing the container. The increased weight of the shipping container is due to the structure of the cylindrical inner sleeve withstanding the force and rotational force as the multi-layered corrugated cardboard and the outer sleeve having the support for the inner sleeve as the multi-layered corrugated cardboard.

Inner sleeves or outer sleeves made of a single layer of corrugated cardboard or plastic are unsuitable for heavy containers for shipping and are not included in the scope of the present invention.

As used herein, the term "representative" refers to a flowable material having a volume of at least 55 gallons and a weight of 450 pounds or more, and the term "loading" refers to stacking containers filled with contents in order so as not to damage or crush the containers located at the bottom.

Shipping containers using the plastic thin bags shown here are suitable for fluids or flowable solids from 55 gallons to 380 gallons in volume. Fluids and suspensions are designed as containers that can effectively carry about 12.5 pounds per gallon and fluidic solid particles about 115 pounds per square foot.

Claims (30)

An outer sleeve having a plurality of corrugated cardboards formed in a polygonal column shape having a plurality of sidewalls, an inner sleeve having a plurality of corrugated cardboards formed in a cylindrical shape and having a circumferential surface connected to the center of each sidewall in the outer sleeve when inserted into the outer sleeve; Located on the lower surface of the outer sleeve and the bottom surface of the inner sleeve is in contact with the upper end of the inner sleeve is composed of support means for protruding above the upper surface of the outer sleeve; When the contents in the inner sleeve is put in, the contents rub against the inner surface of the inner sleeve and press the inner sleeve so that the inner sleeve presses the supporting means so that the heights of the upper surfaces of the outer sleeve and the inner sleeve coincide with each other. Applicable container. The container for transporting heavy loads according to claim 1, wherein the support means is formed in a polygonal bottom plate, such as the cross-sectional formation of the outer sleeve, so as to coincide along the angle of each side wall of the outer sleeve. The container for shipping heavy goods according to claim 2, wherein the bottom plate is made of corrugated cardboard. The container for shipping heavy goods according to claim 2, wherein the bottom plate is made of triple corrugated cardboard. The container for shipping heavy goods according to claim 2, wherein the inner sleeve does not have a bottom wing. The container for transporting heavy loads according to claim 1, wherein the bottom vanes attached along the lower end portions of the outer sidewalls are folded to constitute the supporting means. The method of claim 1, wherein the height of the inner sleeve protruding above the outer sleeve in the state before the contents are filled does not exceed the thickness of the bottom plate as a supporting means for transporting heavy cargo for transporting the liquid load. container. The container for transporting heavy loads according to claim 2, wherein the bottom wings attached along the lower end portions of each side wall of the outer sleeve are folded to constitute the supporting means. The container for shipping heavy goods according to claim 8, wherein the inner sleeve does not have a bottom wing. The container for transporting heavy loads according to claim 6, wherein the bottom wing is made of a single layered corrugated board. The container for transporting heavy loads according to claim 3, wherein the inner sleeve and the outer sleeve are corrugated cardboard plates having vertical bones, which vertically extend the corrugated cardboard plates to form bottom wings. The container for transporting heavy goods for transporting a liquid load according to claim 2, wherein the bottom plate which is laid on the bottom surface of the outer sleeve is lowered to the outer periphery than the center portion while being subjected to vertical pressure as the contents are filled in the inner sleeve. According to claim 1, wherein the bottom wing is connected to the bottom wing of the heavy cargo container for transporting the liquid load, characterized in that the support means constitute. The container for transporting heavy loads according to claim 1, further comprising a plurality of grooves extending from the top surface to the bottom surface along the inner circumferential surface of the inner sleeve. 15. The heavy cargo container for transportation of a cargo load according to claim 14, wherein the inner sleeve is made of triple corrugated cardboard. 15. The method of claim 14, wherein a plurality of grooves are formed appropriately along the transverse direction of the inner surface of the inner sleeve, and at the ends, a joint is formed so that the cylindrical inner sleeve can be easily formed. Heavy shipping container. 15. The heavy shipping container of claim 14, wherein the outer sleeve has an octagonal cross section. The container for heavy cargo for transporting a liquid load according to claim 14, wherein the outer sleeve and the inner sleeve are made of three layers of corrugated cardboard. 19. The container for loading heavy weights according to claim 18, wherein the outer sleeve has a polygonal cross section. 20. The heavy cargo line according to claim 19, wherein a plurality of grooves are formed in the inner sleeve in the transverse direction so that the circular state is well formed and the ends have overlapping portions that can be firmly adhered to each other. Applicable container. 21. The heavy load container for carrying a liquid load according to claim 20, wherein the inner sleeve has grooves formed at intervals of 1 inch to 6 inches. 22. The method of claim 21, wherein the corrugated board of each side wall of the outer sleeve is extended by one layer of corrugated board to each make a bottom wing which can be folded under the support means Heavy shipping container. 23. The container for transporting heavy loads according to Claim 22, wherein the bottom plate is sandwiched between the bottom wing and the inner sleeve as a polymorph such as the cross-sectional formation of the outer sleeve. 24. The container for loading heavy goods according to claim 23, wherein the bottom plate is formed to have a connection angle in close contact with each side wall of the outer sleeve. 25. The heavy load shipping container of claim 24, wherein the bottom plate consists of triple corrugated cardboard plates. 27. A container as claimed in claim 25, having a bag such as a plastic bag for storage of the flowable cargo in the inner sleeve. 27. A container as claimed in claim 26, wherein the disc has a lid covered by the inner sleeve and the outer sleeve and a cover plate filled between the bags embedded in the inner sleeve. 28. The heavy cargo container for transportation of a cargo load according to claim 27, wherein the bottom plate is made of triple corrugated cardboard. 28. The package of claim 27, wherein the cover plate is made of compressible polyester foam. 28. The container according to claim 27, wherein when the shipping container is packaged on a lid and a pallet having a border covering the side in a polygonal shape such as a cross-sectional shape of the outer sleeve, a leg for supporting a packing iron band and covering the edge of the lid is formed. A heavy loading container for transporting a fluid load, characterized in that it has a male brace.

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