Cargo collapse prevention cover and its usage

Abstract

To provide a load-slip cover that is highly elastic, easy to install, and also highly durable. [Solution] The present invention relates to a cargo collapse prevention cover 1 for preventing the collapse of loaded cargo, wherein the cover 1 is made of a weft-knitted fabric in which weft threads 5 are continuously knitted in a cylindrical shape in the horizontal direction, the elongation rate of the weft threads 5 is 10 to 70%, the thickness of the weft threads 5 is 33 to 1100 dtex, and the circumferential elongation rate of the weft-knitted fabric is 130 to 200%.

Description

TECHNICAL FIELD

[0001] The present invention relates to a load collapse prevention cover and a method of using the same, and more specifically, relates to a load collapse prevention cover that is used by being attached to a load stacked on a cargo bed to prevent the load from collapsing, and a method of using the same.

BACKGROUND ART

[0002] In the field of physical distribution, loads are usually stacked in multiple stages on a cargo bed from the viewpoints of improving work efficiency and saving storage space, and are transported or stored in that state. The loads stacked on the cargo bed are wound and fixed with a transparent film, a belt or the like to prevent load collapse.

[0003] However, fixing with a transparent film has the drawbacks that it takes a considerable amount of time to mount the transparent film around the load, and the transparent film itself becomes waste after being removed. In addition, in fixing with a belt, the effect of preventing load collapse (hereinafter also referred to as "load collapse prevention effect") is exhibited only on the surface in contact with the belt, so there is a drawback that a sufficient load collapse prevention effect cannot be obtained for the entire load.

[0004] In contrast, a load collapse prevention cover has been developed as a cover dedicated to loads, which can be mounted more easily than when using a transparent film, and can fix the load as a whole more than when using only a belt. For example, a load-storage prevention sheet is known that includes a strip-shaped sheet member that is wrapped around stacked cargo or stretched between the support columns of a platform on which cargo is mounted, and a plurality of first fastening members fixed to one end of the sheet member so as to protrude from the end of the sheet member, each first fastening member having a hook-and-loop fastener portion and being elastic to apply tension to the sheet member after it has been wrapped or stretched, and furthermore, a non-elastic portion having a non-elastic part formed at the end of each first fastening member, and a grid-forming member that is fixed so as to straddle the plurality of first fastening members and forms a grid together with the plurality of first fastening members, and the fastening of the first fastening members can be operated one by one (see, for example, Patent Document 1).

[0005] Furthermore, there is a known cargo collapse prevention net in which the entire structure is net-like, with openings at the top and bottom ends, and string rings are set horizontally at one location each at the top and bottom ends and at least one location in the middle, the string ring at the top end having a smaller diameter than the other string rings, and at least the bottom end ring is provided with multiple locking parts, and two of these multiple locking parts are selectively connected to each other with a connector (see, for example, Patent Document 2).

[0006] Furthermore, a cylindrical load-storage cover made of double raschel fabric containing synthetic fibers and spandex fibers is known, characterized in that the thickness of the double raschel fabric is 0.5 to 1.5 mm, the axial elongation of the cylindrical shape is 70 to 120%, and the circumferential elongation is 150 to 220% (see, for example, Patent Document 3). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 3551250 [Patent Document 2] Utility Model Registration No. 3158386 Gazette [Patent Document 3] Japanese Patent Publication No. 2022-175937 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] However, the cargo collapse prevention sheet described in Patent Document 1 above has poor elasticity in the sheet material, making it difficult to deform according to the size and shape of the cargo, and there is a risk of damaging the cargo itself due to vibration, etc. The cargo collapse prevention net described in Patent Document 2 above, being a net, does have some elasticity due to the deformation of the mesh, but the material itself is not elastic, so it cannot be said that it can be sufficiently deformed according to the size and shape of the cargo. Furthermore, it cannot be said that it is easy to attach to the cargo because the mesh tends to get caught on the cargo. The load collapse prevention cover described in Patent Document 3 above, while having excellent elasticity due to the inclusion of spandex fibers, cannot be said to have excellent durability because the spandex fibers are prone to deterioration and fatigue failure.

[0009] This invention has been made in view of the above circumstances, and aims to provide a load collapse prevention cover that is highly elastic, easy to install, and highly durable. [Means for solving the problem]

[0010] The inventors considered using a weft-knitted fabric to improve the elasticity of the structure. They found that the above problem could be solved by limiting the elongation of the weft yarn itself and setting the elongation of the weft knit to a predetermined range, thus completing the present invention.

[0011] The present invention relates to a cargo collapse prevention cover for preventing the collapse of loaded cargo, and is made of a weft-knitted fabric in which weft threads are continuously knitted in a cylindrical shape in the horizontal direction, the elongation rate of the weft threads is 10 to 70%, the thickness of the weft threads is 33 to 1100 dtex, and the elongation rate of the weft-knitted fabric in the circumferential direction is 130 to 200%.

[0012] In the load collapse prevention cover of the present invention, the weft is preferably made up of multiple base threads, and the sum of the thicknesses of the base threads is equal to the thickness of the weft. In this case, it is more preferable that the base yarn of the load collapse prevention cover of the present invention is a false-twist yarn.

[0013] In the load-slip prevention cover of the present invention, it is preferable that the weft knitted fabric is knitted using a rib knitting method.

[0014] In the load collapse prevention cover of the present invention, the front and back sides are knitted alternately with the same number of stitches, and it is preferable that the loop length of each loop on both the front and back sides is 2 to 4 mm.

[0015] In the load collapse prevention cover of the present invention, it is preferable that the elongation recovery rate in both the axial and circumferential directions is 50 to 100%.

[0016] The present invention relates to a method for using the above-described cargo collapse prevention cover, comprising a cargo bed, cargo loaded on the cargo bed, and a cargo collapse prevention cover attached to the top of the cargo or to the cargo bed, wherein the cargo collapse prevention cover is positioned so that it covers the cargo bed and cargo by hooking one end of the cover and extending the other end, and the cargo collapse prevention cover applies tension to the cargo bed and cargo. [Effects of the Invention]

[0017] In the load collapse prevention cover of the present invention, the elongation rate of the weft thread itself is limited to a predetermined range, and the thickness of the weft thread is set to a predetermined range, thereby suppressing the breakage of the weft thread. Furthermore, by allowing the cover to expand and contract according to the structure of the load collapse prevention cover, fatigue failure of the weft thread can be suppressed. Thus, the load collapse prevention cover of the present invention has excellent durability and can be used repeatedly while maintaining its performance.

[0018] The load-shifting prevention cover of the present invention is formed of a weft-knitted fabric knitted in the transverse direction using the aforementioned weft yarns. By controlling its knitting structure to set the circumferential elongation rate of the weft-knitted fabric within the aforementioned range, it is possible to bring the cargo bed and the cargo into a state of being tightened from the surroundings, that is, a state where tension is applied to the cargo bed and the cargo, and it is also possible to deform the cover according to the size and shape of the cargo. Further, damage to the cargo itself caused by vibration or the like can also be suppressed. In addition, since it is a weft-knitted fabric, it does not get caught in meshes, and attachment to the cargo is also facilitated.

[0019] The load-shifting prevention cover of the present invention is not formed by sewing a single knitted fabric into a cylindrical shape, but is directly knitted into a cylindrical shape, so that uneven stretchability due to sewn portions does not occur, resulting in excellent stretchability balance.

[0020] Due to these points, according to the load-shifting prevention cover of the present invention, the load-shifting prevention effect can be sufficiently exhibited. That is, by attaching the load-shifting prevention cover to the cargo, it is possible to prevent the stacked cargo from collapsing and falling during movement of the cargo and the cargo bed, or when an earthquake occurs during storage of the cargo.

[0021] In the load-shifting prevention cover of the present invention, by configuring the weft yarn to consist of a plurality of base yarns, even if one base yarn breaks, other base yarns remain, so that the occurrence of pinholes can be suppressed. Incidentally, in the load-shifting prevention cover of the present invention, as described above, it stretches and contracts according to the knitting structure, so even if a pinhole occurs, so-called run-throughs are unlikely to occur.

[0022] In the load-shifting prevention cover of the present invention, by adjusting the sum of the thicknesses of the plurality of base yarns to fall within the aforementioned weft yarn thickness range, breakage and fatigue failure of the weft yarn can be suppressed in the same manner as described above. At this time, by adopting a false-twist yarn as the base yarn, stress relaxation is less likely to occur in the load collapse prevention cover. Although the reason why stress relaxation is less likely to occur is not certain, it is presumed that this is because the adoption of the false-twist yarn as the base yarn improves the strength of the base yarn while also providing a certain degree of stretchability.

[0023] In the load collapse prevention cover of the present invention, by forming the weft knitted fabric by rib knitting, the stretchability based on the structure is excellent among various weft knitted fabrics, and in particular, the stretchability in the lateral direction becomes rubber-like and extremely excellent. This makes it possible to sufficiently adapt to the shape of the load.

[0024] In the load collapse prevention cover of the present invention, by alternately knitting the front stitches and the back stitches in the same number of stitches so that each loop portion has a predetermined loop length, the number of stitches, the position of the stitches, the amount of yarn used in the stitches, etc. are equal between the front stitches and the back stitches, so that curling of the end portion of the load collapse prevention cover can be suppressed.

[0025] In the load collapse prevention cover of the present invention, by setting the elongation recovery rates in the axial direction and the circumferential direction within the above ranges, repeated use is also possible.

[0026] In the method of using the load collapse prevention cover of the present invention, with one end of the load collapse prevention cover hooked, the other end is stretched, so that the load collapse prevention cover can be attached to the loading platform and the load by a simple operation of arranging the cover so as to cover the loading platform and the load. In addition, as described above, the load collapse prevention cover used has excellent stretchability, so that the load collapse prevention effect can be sufficiently exhibited by arranging the cover so as to apply tension to the load. [Brief Description of the Drawings]

[0027] [Figure 1] Figure 1 is a perspective view schematically showing an embodiment of the load collapse prevention cover according to the present invention. [Figure 2]Figure 2(a) is an organizational diagram of the load collapse prevention cover according to this embodiment, and Figure 2(b) is an organizational diagram of the load collapse prevention cover shown in Figure 2(a) in an extended state. [Figure 3] Figure 3 is an explanatory diagram illustrating a method for covering the cargo bed and cargo with the cargo collapse prevention cover according to this embodiment. [Figure 4] Figures 4(a), (b), and (c) are organizational diagrams of load collapse prevention covers according to other embodiments. [Modes for carrying out the invention]

[0028] Preferred embodiments of the present invention will be described in detail below, with reference to the drawings as necessary. In the drawings, the same elements will be denoted by the same reference numerals, and redundant explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Moreover, the dimensional ratios in the drawings are not limited to those shown.

[0029] First, let me explain the load collapse prevention cover according to the present invention. The cargo collapse prevention cover according to the present invention is a sheet that is attached to cover a cargo bed and the cargo loaded on the cargo bed, and is intended to prevent the loaded cargo from collapsing, also known as cargo collapse. In this specification, "loading platform" refers to a base for loading cargo, and specific examples include pallets, carts, cargo containers, nestainer racks, etc. At a minimum, cargo must be loaded on the loading platform, and other cargo may be loaded on top of that cargo. Furthermore, the type, size, shape, and quantity of "cargo" are not particularly limited, as long as it can be loaded onto the truck bed. Furthermore, "axial direction" refers to the axial direction of the cylindrical load-storage cover (weft-knitted fabric), which corresponds to the longitudinal direction of the weft-knitted fabric. Furthermore, "circumferential direction" refers to the circumferential direction of the cylindrical load-storage cover (weft-knitted fabric), and corresponds to the horizontal direction of the weft-knitted fabric. Furthermore, "cargo shifting" refers to the lateral movement of other cargo loaded on top of cargo, or cargo loaded on the cargo bed, due to the movement of cargo and the cargo bed, or due to an earthquake occurring while the cargo is in storage.

[0030] Figure 1 is a schematic perspective view showing one embodiment of a cargo collapse prevention cover according to the present invention. As shown in Figure 1, the load collapse prevention cover 1 according to this embodiment is cylindrical. The cargo collapse prevention cover 1 is not made by sewing together the ends of a single piece of knitted fabric to form a cylinder, but rather by directly knitting it into a cylindrical shape. Therefore, since the load collapse prevention cover 1 does not have any seams, there is no localized variation in elasticity, and the overall balance of elasticity is excellent.

[0031] Here, it is preferable that the lateral size of the cargo collapse prevention cover 1 is such that when it is attached to the cargo bed and the cargo it is extended laterally, and that it is large enough to apply tension to the cargo bed and the cargo based on the restoring force of the weft knitted fabric. Furthermore, the vertical size of the cargo collapse prevention cover 1 is not particularly limited and can be set arbitrarily. However, it is preferable that the size be such that when the cargo collapse prevention cover 1 is extended vertically, it can cover the loading platform and 80% or more of the entire load.

[0032] The cargo collapse prevention cover 1 is made of a weft-knitted fabric in which the weft threads are continuously knitted horizontally into a cylindrical shape. Therefore, the cargo collapse prevention cover 1 has superior elasticity based on its structure compared to nets, woven fabrics, warp-knitted fabrics, nonwoven fabrics, etc. Incidentally, even in weft-knitted fabrics, the elasticity can be altered by controlling the knitting method, loop size, gauge number, and characteristics of the weft yarn.

[0033] In the cargo collapse prevention cover 1, when the weft knitted fabric is stretched three times in the circumferential direction, it is preferable that the shrinkage rate in the axial direction is 50% or less. If the axial shrinkage rate of a weft-knitted fabric, when stretched three times in the circumferential direction, exceeds 50%, there is a risk that it may not adequately cover a load located in the center when viewed from the front, compared to when the axial shrinkage rate is within the above range. Note that a higher shrinkage rate indicates greater axial shrinkage.

[0034] Furthermore, in the cargo collapse prevention cover 1, it is preferable that the circumferential elongation rate of the weft knitted fabric is 130 to 200%. If the circumferential elongation rate of the weft-knitted fabric of the cargo collapse prevention cover 1 is less than 130%, it will be difficult to deform according to the size and shape of the cargo, and there is a risk of damage due to lateral displacement of the cargo. If the circumferential elongation rate of the weft-knitted fabric exceeds 200%, although it can accommodate lateral displacement of the cargo, the tension applied to the cargo will be weaker, making it difficult to keep the cargo in its original position. The elongation rate was measured in accordance with JIS L1096 Method A.

[0035] In the load collapse prevention cover 1, it is preferable that the elongation recovery rate in both the axial and circumferential directions of the weft knitted fabric is 50 to 100%. The cargo collapse prevention cover 1 has a drawback: if the axial and circumferential stretch recovery rate of the weft-knitted fabric is less than 50%, the fabric will easily stretch with repeated use. Furthermore, when the weft-knitted fabric stretches, the tension applied to the cargo weakens, which may make it difficult to keep the cargo in its original position. The elongation recovery rate was measured in accordance with JIS L1096 Method A.

[0036] In the cargo collapse prevention cover 1, the weft knit can be made using circular knitting methods such as plain knitting, rib knitting, pearl knitting, or double knitting, or flat knitting. Among these, the weft-knitted fabric is preferably circular knit, and more preferably rib knit. In this case, the elasticity based on the structure is superior, and in particular the lateral elasticity becomes rubbery, making it possible to adequately accommodate the shape and movement of the cargo. In this embodiment, the load collapse prevention cover 1 employs a rib knit.

[0037] Figure 2(a) is an organizational diagram of the load collapse prevention cover according to this embodiment, and Figure 2(b) is an organizational diagram of the load collapse prevention cover shown in Figure 2(a) in an extended state. As shown in Figures 2(a) and (b), in the load collapse prevention cover 1, expansion and contraction occur based on the structure of the material, rather than the weft threads themselves expanding and contracting. Therefore, fatigue failure of the weft threads 5 can be suppressed. As a result, the load collapse prevention cover 1 has excellent durability, allowing it to be used repeatedly while maintaining its performance.

[0038] In the cargo collapse prevention cover 1, the weft yarn 5 consists of two base yarns 5a. In the cargo collapse prevention cover 1, the weft threads 5 (two base threads 5a) alternately form right stitches 2 and wrong stitches 3 in equal numbers (1 stitch each). Therefore, in the load collapse prevention cover 1, the total number of front side 2 items and the total number of back side 3 items are the same. Furthermore, in the load collapse prevention cover 1, the front stitch 2 and the back stitch 3 have the same configuration except that their orientations are different. In this way, in the load collapse prevention cover 1, the number of stitches, the position of the stitches, and the amount of yarn used in each stitch are equal between the front stitch 2 and the back stitch 3, which makes it possible to suppress curling of the edges of the load collapse prevention cover 1.

[0039] From the viewpoint of allowing the overall elasticity to be fully realized, the loop length L of each loop in the front stitch 2 and back stitch 3 is preferably 2 to 4 mm. Here, the loop length L is the length of the thread required to form one loop, as shown in Figure 2(b). In other words, one loop is a repeating unit, and its total length is the loop length. Note that the loop length L remains the same regardless of the elongation of the load-storage cover. In the load collapse prevention cover 1, if the loop length of each loop in the right stitch 2 and the wrong stitch 3 is less than 2 mm, the friction between the weft threads 5 during stretching will be greater compared to when the loop length is within the above range, which may make stretching difficult. If the loop length of each loop in the right stitch 2 and the wrong stitch 3 exceeds 4 mm, the strength of the weft knitted fabric itself may be compromised compared to when the loop length is within the above range.

[0040] Furthermore, when the load collapse prevention cover 1 is not stretched, the distance D between adjacent surface areas 2 is preferably 0.5 to 1.0 mm, and more preferably 0.8 to 0.9 mm, from the viewpoint of allowing sufficient elasticity to be achieved. In the load collapse prevention cover 1, if the distance D between adjacent knit stitches 2 is less than 0.5 mm, the yarn density will be unnecessarily dense compared to when the distance D is within the above range, which may increase the weight and worsen handling. If the distance D between adjacent knit stitches 2 exceeds 1.0 mm, the yarn density will be sparser compared to when the distance D is within the above range, which may reduce the strength of the weft knitted fabric. Furthermore, the distance between two adjacent pairs of 3 reversed numbers is the same as the distance D between two adjacent pairs of 2 heads.

[0041] In the cargo collapse prevention cover 1, the material of the weft yarn 5 (base yarn 5a) can be natural yarn made from cotton, wool, silk, linen, cashmere, etc., artificial yarn made from rayon, acetate, polyester, nylon, vinylon, acrylic, polypropylene, aramid fiber, etc., or a blend of these. Among these, the material of the weft thread 5 is preferably polyester or nylon from the viewpoint of strength and versatility.

[0042] In the cargo collapse prevention cover 1, the weft yarn 5 has an elongation rate of 10-70%, preferably 10-50%, and more preferably 25-35%. If the elongation rate of the weft thread 5 of the cargo collapse prevention cover 1 is less than 10%, the degree of freedom of elasticity is too small compared to when the elongation rate is within the above range, which may cause the weft thread to break during knitting and reduce the yield. If the elongation rate of the weft thread 5 exceeds 70%, the tension applied to the cargo will be weaker compared to when the elongation rate is within the above range, which may make it difficult to keep the cargo in its original position. Incidentally, since the weft yarn 5 consists of two base yarns 5a, it is preferable that the elongation rate of the two base yarns 5a is within the above range.

[0043] In the cargo collapse prevention cover 1, the weft thread 5 has a thickness of 33 to 1100 dtex, and preferably 56 to 220 dtex. If the thickness of the weft thread 5 in the load collapse prevention cover 1 is less than 33 dtex, the weft thread 5 may be more prone to breaking compared to when the thickness is within the above range. If the thickness of the weft thread 5 exceeds 1100 dtex, the handling may be worse compared to when the thickness is within the above range. Incidentally, since the weft yarn 5 consists of two base yarns 5a, the thickness of the weft yarn 5 is the sum of the thicknesses of the two base yarns 5a. In other words, if the weft yarn consists of multiple base yarns, the sum of the thicknesses of the multiple base yarns is the thickness of the weft yarn 5. In this case, it is preferable that the thickness of each base yarn 5a is the same.

[0044] Here, it is preferable that the weft yarn 5 possesses both the elongation rate and the thickness described above. In this case, the load collapse prevention cover 1 suppresses the breakage of the weft threads and also suppresses fatigue failure of the weft threads due to repeated expansion and contraction of the load collapse prevention cover.

[0045] In the load collapse prevention cover 1, as described above, the weft thread 5 consists of two base threads 5a. Therefore, even if one base thread 5a breaks, the other base thread 5a remains, which helps to prevent the formation of pinholes. Furthermore, in the load collapse prevention cover 1, the two base threads 5a are not integrated but are intentionally kept separate. That is, although the two base threads 5a are partially intertwined, they are positioned parallel to each other. This makes it possible to achieve greater elasticity while maintaining strength.

[0046] In the cargo collapse prevention cover 1, the form of the base yarn 5a (weft yarn 5) can be raw silk, false twist yarn, twisted yarn, etc. Among these, it is more preferable that the base yarn 5a (weft yarn 5) is a false-twist yarn. In this case, the load collapse prevention cover 1 has the advantage of not only having a better texture but also being less prone to stress relaxation.

[0047] As a result of these factors, the load collapse prevention cover 1 can fully demonstrate its load collapse prevention effect. Furthermore, the cargo collapse prevention cover 1 can be deformed according to the size and shape of the cargo. Furthermore, it can also suppress damage to the luggage itself caused by vibrations, etc. Furthermore, because it is a weft-knit fabric, it will not get caught in the mesh, and it is easy to attach to luggage.

[0048] Next, a method for using the cargo collapse prevention cover according to the present invention will be described. Figure 3 is an explanatory diagram illustrating a method for covering the cargo bed and cargo with the cargo collapse prevention cover according to this embodiment. As shown in Figure 3, the method of using the cargo collapse prevention cover 1 according to this embodiment is to attach the above-described cargo collapse prevention cover 1 to the cargo bed 6 and the cargo 7 loaded on the cargo bed 6.

[0049] There are two ways to use the cargo collapse prevention cover 1. The first method is as shown in the left diagram of Figure 3, in which the cargo collapse prevention cover 1 is attached to the top of the cargo 7, and one end of the cargo collapse prevention cover 1 is hooked onto the top of the cargo 7, while the other end is extended, thereby covering the loading platform 6 and the cargo 7, and positioning the cargo collapse prevention cover 1 so that tension is applied to the loading platform 6 and the cargo 7. The second method, as shown in the right-hand diagram of Figure 3, involves attaching the cargo collapse prevention cover 1 to the cargo bed 6, hooking one end of the cargo collapse prevention cover 1 onto the cargo bed 6, and extending the other end to cover the cargo bed 6 and the cargo 7, while also positioning the cargo collapse prevention cover 1 so that tension is applied to the cargo bed 6 and the cargo 7. Furthermore, when implementing the second method, it is preferable to attach the cargo collapse prevention cover 1 to the cargo bed 6 before loading the cargo 7 onto the cargo bed 6.

[0050] Thus, in using the cargo collapse prevention cover 1, it is possible to attach the cargo collapse prevention cover 1 to the cargo bed 6 and the cargo 7 with a simple operation: by hooking one end of the cargo collapse prevention cover 1 and extending the other end, the cover can be positioned to cover the cargo bed 6 and the cargo 7. Furthermore, as mentioned above, the cargo collapse prevention cover 1 used has excellent elasticity, so by positioning it in such a way that tension is applied to the cargo 7, it can fully exert its cargo collapse prevention effect.

[0051] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. In this embodiment, the load collapse prevention cover 1 is directly knitted into a cylindrical shape, but it may also be made by sewing together the ends of a single piece of weft-knitted fabric to form a cylindrical shape. Alternatively, two cylindrical load-slip covers 1 may be placed one above the other, with the upper and lower ends sewn together to extend the overall length.

[0052] In the load collapse prevention cover 1 according to this embodiment, the weft yarn 5 consists of two base yarns 5a, but is not limited to this. The weft yarn 5 may consist of one base yarn or three or more base yarns. From the viewpoint of strength, ease of stretching, etc., it is preferable that the weft thread 5 is made up of two base threads.

[0053] Figure 4(a) is an organizational diagram of a load collapse prevention cover according to another embodiment. As shown in Figure 4(a), when the weft consists of a single base yarn, the elongation of the weft (single base yarn) is preferably 10-70%, more preferably 10-50%, and more preferably 25-35%. Furthermore, the weft yarn (one base yarn) is preferably 33 to 1100 dtex in thickness, and more preferably 56 to 220 dtex.

[0054] In the load collapse prevention cover 1 according to this embodiment, the weft yarn 5 (two base yarns 5a) alternately forms loops with one right stitch 2 and one wrong stitch 3. However, loops may be formed alternately with multiple stitches each, or these may be formed by alternating between these methods. Figures 4(b) and 4(c) are organizational diagrams of load collapse prevention covers according to other embodiments. As shown in Figure 4(b), for example, two base yarns 5a may be used to form loops alternately with 2 stitches each, or as shown in Figure 4(c), loops may be formed alternately with 3 stitches each. [Industrial applicability]

[0055] The cargo collapse prevention cover according to the present invention is attached to cover the cargo bed and the cargo loaded on the cargo bed, and is used as a sheet to prevent the loaded cargo from collapsing, also known as cargo collapse. The load collapse prevention cover 1 according to the present invention not only effectively prevents load collapse, but also has excellent elasticity, making it easy to install, and is also highly durable. [Explanation of Symbols]

[0056] 1. Cargo collapse prevention cover 2...Table 3. Backfire 5. Weft thread 5a...Base yarn 6...Cargo bed 7. Luggage

Claims

1. A cargo shift prevention cover for preventing cargo from shifting during loading, It consists of a weft-knitted fabric in which the weft threads are continuously knitted horizontally in a cylindrical shape. The elongation rate of the aforementioned weft yarn is 10 to 70%, The thickness of the aforementioned weft yarn is 33 to 1100 dtex. A cargo collapse prevention cover having a circumferential elongation rate of 130-200% in the aforementioned weft-knitted fabric.

2. The aforementioned weft yarn consists of multiple base yarns, The cargo collapse prevention cover according to claim 1, wherein the sum of the thicknesses of the base threads is equal to the thickness of the weft threads.

3. The load collapse prevention cover according to claim 2, wherein the base yarn is a false twist yarn.

4. The cargo collapse prevention cover according to claim 1, wherein the aforementioned weft knitted fabric is knitted by rib knitting.

5. The knit stitches and purl stitches are arranged alternately in equal numbers. The load collapse prevention cover according to claim 1, wherein the loop length of each loop portion on the front and back sides is 2 to 4 mm.

6. The load collapse prevention cover according to claim 1, wherein the extension recovery rate in both the axial and circumferential directions is 50 to 100%.

7. A method for using the cargo collapse prevention cover according to claim 1, It comprises a cargo bed, cargo loaded on the cargo bed, and a cargo collapse prevention cover attached to the top of the cargo or to the cargo bed, A method for using a cargo collapse prevention cover, wherein one end of the cargo collapse prevention cover is hooked onto the cargo bed and the cargo, and the other end is extended to cover the cargo bed and the cargo, and the cargo collapse prevention cover is positioned so that tension is applied to the cargo bed and the cargo.

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