JP7582907B2 - Cargo shift prevention cover - Google Patents

Description

The present invention relates to a cover that prevents cargo from shifting, which is easy to attach to cargo and has a high degree of freedom in terms of the size and shape of the cargo that can be loaded.

Generally, when transporting or storing luggage, the luggage is stacked in multiple layers on pallets, carts, cargo, etc. in order to improve work efficiency and save storage space. The luggage stacked on pallets, etc. in this way is secured in place by wrapping stretch film, belts, sheets, etc. around it.

Generally, cartons on carts or pallets are wrapped in clear plastic to prevent them from collapsing. Clear plastic is a material that can be obtained anywhere, but it takes a considerable amount of time to wrap the cartons around the cargo, and when it is removed, the clear plastic itself becomes waste. Furthermore, depending on how tightly the clear plastic is wrapped, the cargo may become crushed.

In addition to transparent wrap, special covers may also be used. For example, there are some that have multiple belts attached to a large sheet member, which are used to adjust the size and secure the item in place (see Patent Document 1). However, this type of cover is not user-friendly, as the fabric itself is not flexible and the range of adjustment is limited. Also, some covers can damage the luggage themselves.

On the other hand, in a cargo-shift prevention net that is entirely net-shaped, with open top and bottom ends, and with one string ring set horizontally at each of the top and bottom ends and at least one in the middle, with the top string ring having a smaller diameter than the other string rings, a cargo-shift prevention net has been proposed in which at least the bottom ring is provided with multiple locking parts, and two of these multiple locking parts are selectively and detachably connected with a connector (see Patent Document 2).

However, this type of cover has issues with its limited range of applications and the installation process is time-consuming. In addition, the flexibility of the net allows it to fit the luggage when installing, but when securing the luggage, the net must be pulled until it loses its flexibility to prevent the luggage from moving, which can result in the cover itself damaging the luggage.

JP 2002-179132 A Utility Model Registration No. 3158386

The present invention was proposed in light of the above circumstances, and aims to provide a cover to prevent cargo from shifting that is easy to attach to cargo and has a degree of freedom in terms of the size and shape of cargo that can be loaded.

The first aspect of the present invention that achieves the above object is a cylindrical cargo shift prevention cover made of a double raschel fabric containing synthetic fibers and spandex fibers, 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%.

The second aspect of the present invention is the cargo collapse prevention cover of the first aspect, characterized in that the double raschel fabric contains 70 to 90% synthetic fibers and 10 to 30% spandex fibers.

The third aspect of the present invention is the cargo collapse prevention cover of the first or second aspect, characterized in that the synthetic fiber is at least one type selected from nylon and polyester.

The fourth aspect of the present invention is a cargo collapse prevention cover according to any one of the first to third aspects, characterized in that the stretch recovery rate of the double raschel fabric is 80-100% in the axial direction and 80-100% in the circumferential direction.

The fifth aspect of the present invention is a cargo collapse prevention cover according to any one of the first to fourth aspects, characterized in that the double raschel fabric has an opacity of 80 to 100 under normal conditions and 60 to 80 when stretched 100%.

According to the present invention, by using a specific double russell fabric containing spandex fibers, it is possible to provide a cover to prevent collapse of cargo that is easy to attach to cargo due to its stretchability and recovery properties, and has a degree of freedom in terms of the size and shape of the cargo that can be loaded.

1 is a diagram showing a schematic configuration of a cargo collapse prevention cover of the present invention. FIG. 13 shows the results of a tensile test. 13 is a photograph showing the results of a vibration test.

As shown in FIG. 1, which shows the general configuration of the cargo collapse prevention cover of the present invention, it consists of a cylindrical cover body 10, with openings 11 at the top and bottom axial ends.

The cover body 10 of the present invention is made of a double raschel fabric containing synthetic fibers and spandex fibers. The double raschel fabric is warp knitted on a double raschel knitting machine and has no seams in the circumferential direction. Therefore, even if it stretches in the circumferential direction, it is unlikely to get caught on luggage and there is no risk of fraying.

The double raschel fabric of the present invention has a thickness of 0.5 to 1.5 mm, preferably 0.8 to 1.0 mm. If it is thinner than this, it will be difficult to support the load, and if it is thicker than this, a large force will be required to stretch it, which is undesirable.

The double raschel fabric of the present invention is preferably, for example, 24 to 28 gauge. Here, gauge refers to the standard number of stitches and rows for knitting a certain size of knitted fabric, and indicates how many needles of a knitting machine are contained in one inch (2.54 cm). The higher the gauge number, the finer the stitches, and the lower the number, the coarser the stitches. The above gauge numbers are relatively high gauge for knitted products, and result in a fabric with fine stitches.

The double raschel fabric of the present invention has an axial stretch rate of 70-120%, preferably 100-120%, and a circumferential stretch rate of 150-220%, preferably 200-220%. By keeping the stretch rate within this range, it can be easily placed over loaded cargo, can accommodate a variety of loading sizes, and prevents cargo from shifting.

The horizontal (circumferential) elongation rate is based on the following calculations. Table 1 below shows the results of a calculation to see if the cover can be covered if the elongation of the cover is changed, assuming a cover with a circumferential length of 1,800 mm and an axial length of 1,500 mm, a pallet size of 1,100 mm on each side and a peripheral dimension of 4,400 mm, and 28 cardboard boxes with a side of 480 mm (long side) are loaded.

The desirable stretch rate is determined by the relationship between the stretch of the cover caused by vibrations during cargo transport and the gap between the cover and the pallet after stretching. If the stretch rate is low, it will be difficult to cover the pallet itself, and if the stretch rate is high, there will be a problem that the gap will be too large when the cover stretches too much, causing the cardboard boxes to fall out.

On the other hand, in the vertical direction (axial direction), the minimum value can be accommodated by shrinking the cover, but the maximum value requires an elongation rate of preferably 120% of the original length of 1500 mm in order to enclose the expected maximum luggage height of 3300 mm.

The double raschel fabric of the present invention also has a stretch recovery rate of 80-100%, preferably 90-100%, in the axial direction, and 80-100%, preferably 90-100%, in the circumferential direction. By keeping the stretch recovery rate within this range, it is possible to prevent the load from collapsing after it is placed over the loaded cargo, and this can be achieved for a variety of load sizes.

The double russell fabric of the present invention contains synthetic fibers and spandex fibers, with the synthetic fiber content being 70-90%, preferably 80-90%, and the spandex fiber content being 10-30%, preferably 10-20%.

The double russell fabric of the present invention contains spandex fibers in the ranges described above, so that it has the elongation and elongation recovery rates described above.

Here, spandex fiber is a polyurethane elastic fiber. The synthetic fiber is at least one selected from nylon, polyester, and polyethylene, with nylon being particularly preferred.

In the double raschel fabric of the present invention, in order to achieve the above-mentioned range of synthetic fibers and spandex fibers, yarns containing such ratios may be used to knit on a double raschel knitting machine, but it may also be possible to knit on a double raschel knitting machine using yarns of synthetic fibers and yarns of spandex fibers or yarns containing synthetic fibers and spandex fibers.

The double raschel fabric of the present invention contains spandex fiber in the range described above, and depending on the yarn thickness and knitting conditions, has the elongation rate and elongation recovery rate described above, and can have a thickness within a specified range.

The double raschel fabric of the present invention has an anti-see-through value of 80 to 100, preferably 80 to 90, under normal conditions, and 60 to 80, preferably 70 to 80, when stretched 100%. This level of anti-see-through value is preferable because it allows the luggage to be easily confirmed when the fabric is placed over the luggage. This level of anti-see-through value is achieved by forming the double raschel fabric with a specified thickness and containing a specified ratio of synthetic fibers and spandex fibers.

As explained above, the cargo collapse prevention cover of the present invention is made of double russell fabric with a predetermined stretch rate and excellent stretch recovery rate, which allows it to flexibly deform when placed over the loaded cargo, making it easy to wear, and once put on, it fits the cargo due to its stretch recovery rate, ensuring that cargo collapse is prevented.

In addition, if the cargo is transported with the cargo collapse prevention cover of the present invention attached, and the cargo is moved due to an impact, the excellent stretch recovery rate of the double russell fabric effectively prevents the cargo from collapsing.

In addition, the load is always kept constant, there is no load fluctuation on the load, the load itself is small, and the load is not damaged.
It also has stretchability in the vertical direction, so it can handle tall luggage.
Also, one size can be used for both carts and pallets.

Furthermore, when the cargo-shift prevention cover of the present invention is placed over loaded cargo, if you want to cover it more securely, you can improve the cargo-shift prevention performance by pinching and tying the ends of the top and bottom openings after putting it on.

In addition, it has a certain degree of transparency, making it easy to see what's inside.

In addition, because it is cylindrical and made from a single piece of seamless fabric, pressure is distributed evenly, putting less strain on luggage and the cover itself is less likely to tear.

In addition, although it is transparent, it is made of double russell fabric, so unlike netting materials, it is able to prevent dirt from the outside and direct wetting to a certain extent.

Double russell fabric does not easily fray even when cut, so holes can be easily added later to accommodate switches in the loading compartment, etc.

In addition, the fabric is less likely to fray at the edges, which has the advantage that dirt (lint and other debris) from the cover itself is less likely to occur.
Double russell fabric has high abrasion resistance and excellent durability compared to flat knitted fabrics.
Of course, it is washable and can be reused, making it economical.

The cargo collapse prevention cover of the present invention can be installed very easily by simply stretching it and placing it over the cargo loaded from above, and can be installed in about 10 seconds on a cart and about 30 seconds on a pallet. For example, if a transparent wrap is used, it can take several minutes, and no other cover can be installed in such a short time.

In addition, with clear wrap and other band types, the worker must move to wrap the item, but with this product, the movement is only in the up and down direction, making it very easy to wrap.

In addition, the cargo collapse prevention cover of the present invention can be shrunk and attached to the cart or pallet itself when not needed, so it has the advantage of not getting in the way even when not in use.
Double russell fabric can be post-processed to make it waterproof, water-repellent, anti-static, and dyeable.

Next, the present invention will be described in more detail with reference to the following experimental examples.

(Example)
A cylindrical cargo shift prevention cover was produced with a width of 900 mm (circumference of 1800 mm) and an axial length of 1500 mm. The cargo shift prevention cover was a double raschel fabric (24 gauge) warp-knitted on a double raschel knitting machine, with a basis weight of 216 g/ ^m2 and a thickness of 0.9 mm. The double raschel fabric contained nylon fiber and spandex fiber, with 88% nylon fiber and 12% spandex fiber.

(Product characteristics)
(1) Elongation Test method: JIS L1018B method When the original length (cm) is L0 and the length (cm) after applying a load of 500 g and maintaining it for 1 minute is L1, the elongation Ep (%) was calculated by the following formula.
Elongation Ep (%) = {(L1-L0)/L0} x 100
The results of the measurements were as follows:
Axial direction (vertical): 110% (2.1 times the original size)
Circumferential direction (horizontal): 220% (3.2 times the original size)

(2) Elongation recovery rate Test method: JIS L1018B method When the original length (cm) is L0, the length (cm) after applying a load of 500 g and maintaining it for 1 minute is L1, and the length (cm) 1 minute after removing the load is L2, the elongation recovery rate (%) was calculated using the following formula.
Elongation recovery rate (%) = {(L1-L2)/(L1-L0)}×100
The results of the measurements were as follows:
Axial direction (vertical): 90%
Circumferential direction (horizontal): 90%

(3) Residual strain rate The residual strain rate (%) was calculated by the following formula, where the original length (cm) was L0, the length (cm) after applying a load of 500 g and holding it for 1 minute was L1, and the length (cm) 1 minute after removing the load was L2.
Residual distortion rate (%) = {(L2 - L0) / L1} x 100

(Comparison results)
The results of comparing the elongation, elongation recovery and residual strain with those of commercially available products A and B are shown in Table 2.

(4) Tensile properties Test method: The fabric is pulled at a pulling speed of 200 mm/min, and the load at that time is measured.
The results were calculated based on the cross-sectional area and the average fabric thickness of 0.93 mm, and converted into tensile stress.
The results are shown in FIG.
In the longitudinal direction (a), the tensile stress increases sharply when the elongation rate exceeds 120%, but in the transverse direction (b), the elongation rate and the tensile stress are in a roughly proportional relationship.
This shows that no matter what the horizontal elongation rate is, the tensile stress does not change significantly and only rises at a constant rate, so that it is easy to attach to any size pallet, and that when the vertical elongation rate is within the range of 120% or less, it is easy to wrap the carton and effectively prevent collapse of the cargo. Note that the elongation rate of 120% is the height of the carton assumed to be near the upper limit of that range.

(5) Anti-see-through property Test method: JIS L1923 instrument method The anti-see-through index was calculated from the following formula, and the anti-see-through index was determined as the anti-see-through property.
Anti-transparency index = (Brightness when using black backing/Brightness when using white backing) x 100
The anti-see-through properties were as follows:
Example: 87.1, 72.9 when stretched twice
Product A: 87.9
Product B: 99.7

(Fitting test)
(1) When installing the pallet Pallets and roll box pallets that are commonly used are approximately 1100 mm square.
The cover for preventing collapse of cargo in the embodiment is cylindrical in shape with a width of 900 mm (circumferential direction: 1800 mm) and a length of 1500 mm.
When it was attached to a square pallet with sides of 1,100 mm (perimeter 4,400 mm), it could be easily attached even when stretched 2.5 times its original size.
Once fitted, the cover recovered to 90% and fitted perfectly.

Although resistance was felt at the maximum stress when putting on the garment, the tensile stress was only about 0.1 MPa even when the fabric was stretched to twice its original size (100% elongation), and even after that the tensile stress only increased slightly, making it easy to put on.

(2) When attaching to luggage When attaching to a group of luggage containing many cardboard boxes stacked in multiple layers, the vertical properties were 110% and the bag was stretched well while wrapping and covering the bag, which made it possible to attach it smoothly.
After attachment, the product attempted to return to its original length with a recovery rate characteristic of 90%.
The tensile stress when putting on the garment was about 0.1 MPa even when the fabric was stretched 1.8 times (elongation rate 80%), and the garment could be easily put on.
The original height is 1500 mm, and with an elongation rate of 120%, it can reach a height of up to 3300 mm.

(3) Checking the Package Although the package was packed with the cover stretched, the cover had an opacity rating of 73, making it possible to visually check the package inside.

(4) When transporting luggage When transporting a group of luggage attached in (2), the load on the luggage was repeatedly stretched in the lateral direction at a stretch rate of 220% and then contracted at a recovery rate of 90%, which made it possible to distribute the load and effectively prevent the luggage from falling over.
Furthermore, since this load distribution is done across the entire fabric and there are no sewn areas, there is less damage to the cover and less risk of tearing in areas where the load is concentrated.
In addition, the stress on the luggage is kept within approximately 0.1 MPa, so it is estimated that there is almost no load on the luggage itself.

(Vibration test)
A cargo collapse prevention cover was attached to a cargo containing multiple layers of cardboard boxes in the same manner as in the installation test (4), and a vibration test was conducted in accordance with JIS Z0200.
FIG. 3 shows a state before the test ((a)) and a state after the test ((b)).
As a result, it was confirmed that the product passed the bounce vibration test level 3.
The bounce vibration test level 3 reproduces the domestic transportation environment, and shows that if these characteristics are met in an actual site, it will be possible to prevent cargo from shifting.

The cargo collapse prevention cover of the present invention can accommodate a variety of cargo, including pallets, roll box pallets, and cargo loaded on carts, and can effectively prevent cargo from collapsing.

10 Cover body 11 Opening

Claims (5)

A cylindrical cargo shift prevention cover made of double raschel fabric containing synthetic fibers and spandex fibers, 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%. The cargo collapse prevention cover according to claim 1, characterized in that the double raschel fabric contains 70-90% synthetic fibers and 10-30% spandex fibers. The cargo collapse prevention cover according to claim 1 or 2, characterized in that the synthetic fiber is at least one selected from nylon and polyester. The cargo collapse prevention cover according to any one of claims 1 to 3, characterized in that the stretch recovery rate of the double raschel fabric is 80 to 100% in the axial direction and 80 to 100% in the circumferential direction. A cargo collapse prevention cover as described in any one of claims 1 to 4, characterized in that the double raschel fabric has an anti-see-through property of 80 to 100 under normal conditions and 60 to 80 when stretched 100%.

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