JP7086374B2 - Fruit bag - Google Patents

Description

The present invention relates to a fruit bag.

In fruit cultivation, fruit bags are hung on the fruits to protect them from pests, sunlight and wind and rain. On the other hand, it has been pointed out that the fruit hung with a fruit bag has a large drag coefficient against wind and causes a fall (Non-Patent Document 1).

Hirono Matsumoto, Yoshihiro Kubota, Masayuki Oishi, Osamu Mochizuki, Relationship between apple bagging and falling of strong winds, Proceedings of the Japan Society of Mechanical Engineers, vol.82 (2016), No.833, DOI: 10.1299 / transjsme.15-00389, (2016), pp.1-8.

There is a demand for fruit bags that reliably protect the fruits and are less likely to cause the fruits to fall. The present invention has been proposed in view of such conventional circumstances, and an object of the present invention is to provide a fruit bag that suppresses fruit falling due to wind.

In order to achieve the above object, the fruit bag of one aspect of the present invention is a fruit bag that houses the fruit inside, and has a body having a body that surrounds the fruit from the horizontal direction and opens upward. The body portion is provided with a fold line-shaped mountain fold portion and a fold line-shaped valley fold portion, and the mountain fold portion and the fold line-shaped valley fold portion extend in the horizontal direction and extend in the vertical direction. Alternately line up along.

In the above-mentioned fruit bag, a string portion for closing the opening of the bag body may be provided on the upper side of the body portion.

In the above-mentioned fruit bag, the body portion may be configured to be substantially circular when viewed from the vertical direction.

In the above-mentioned fruit bag, the mountain fold portion and the valley fold portion may be configured to extend uniformly along the circumferential direction.

In the above-mentioned fruit bag, the mountain fold portion and the valley fold portion may be provided on the body portion by Miura fold.
In the above-mentioned fruit bag, the ratio of the distance between the mountain folds to the diameter of the valley fold may be 1/10 or more and 2/10 or less.
In the above-mentioned fruit bag, the ratio of the distance between the mountain fold portion and the valley fold portion along the radial direction to the diameter of the valley fold portion may be 0.87 / 10 or more and 1.73 / 10 or less. ..
In the above-mentioned fruit bag, the bag body may be configured to have a circular bottom located below the body and covering the opening under the body.

According to the present invention, it is possible to provide a fruit bag in which an increase in drag coefficient is suppressed.

The perspective view which shows the use example of the fruit bag of 1st Embodiment. Front view of the fruit bag of the first embodiment. The side view of the fruit bag of 1st Embodiment. The plan view of the fruit bag of 1st Embodiment. Bottom view of the fruit bag of the first embodiment. The front view which shows the state which the fruit bag of 1st Embodiment was folded. Front view of the fruit bag of the second embodiment. Photograph of sample (d) in the example. Measurement results of the resistance coefficients of the samples (a) to (e) in the examples.

Hereinafter, the fruit bag according to the embodiment of the present invention will be described with reference to the drawings. In the following drawings, in order to make each configuration easy to understand, the scale and number of each structure may differ from the actual structure. Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate.

<First Embodiment>
FIG. 1 is a perspective view showing an example of use of the fruit bag 1 of the first embodiment. 2, FIG. 3, FIG. 4, and FIG. 5 are a front view, a side view, a plan view, and a bottom view of the fruit bag 1, respectively. Further, FIG. 6 is a front view showing a state in which the fruit bag 1 is folded.

As shown in FIG. 1, the axis parallel to the vertical direction and passing through the center of the fruit bag 1 is defined as the central axis J. Further, in the following description, the positive side (+ Z side, one side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side, other side) in the Z-axis direction is referred to as "lower side". Call. It should be noted that each direction in the present specification is an example of the posture when the fruit bag is used, and does not limit the posture of the fruit bag. Unless otherwise specified, the direction parallel to the central axis J is simply referred to as "axial direction" or "vertical direction", and the radial direction centered on the central axis J is simply referred to as "diametrical direction". The circumferential direction around the center, that is, the circumference of the central axis J is simply called the "circumferential direction".

The fruit bag 1 has a bag body 5 and a string (string portion) 2. The bag body 5 is formed in a bag shape that opens upward. Fruit F is housed in the internal space of the bag body 5.

The bag body 5 is made of paper, a non-woven fabric, a synthetic resin film, or the like. The bag body 5 has a tubular body portion 20, a binding portion 10 located above the body portion 20 and covering the upper opening of the body portion 20, and a binding portion 10 located below the body portion 20 and below the body portion 20. It has a bottom portion 30 that covers the side opening. A string 2 is attached to the binding portion 10.

The body portion 20 has a tubular shape extending in the vertical direction (axial direction). The body portion 20 is circular when viewed from the vertical direction. The body portion 20 surrounds the fruit F from the horizontal direction. The body portion 20 has a plurality of first strip-shaped portions 21 and a plurality of second strip-shaped portions 22. The first and second strips 21, 22 are arranged alternately along the vertical direction. The first and second strips 21, 22 extend along the circumferential direction.

The first and second strips 21 and 22 are formed in the shape of a conical surface of a conical column centered on the central axis J. The diameter of the first strip 21 increases from the upper side to the lower side. Therefore, in the first band-shaped portion 21, the diameter of the lower end portion is larger than the diameter of the upper end portion. On the other hand, the diameter of the second strip 22 is reduced from the upper side to the lower side, and the diameter of the upper end portion is larger than the diameter of the lower end portion.

The lower end of the first strip 21 is connected to the upper end of the second strip located below it. Further, the lower end portion of the second strip-shaped portion 22 is connected to the upper end portion of the first strip-shaped portion located below the lower end portion. Therefore, the diameter of the lower end portion of the first strip-shaped portion 21 coincides with the diameter of the upper end portion of the second strip-shaped portion 22, and the diameter of the lower end portion of the second strip-shaped portion 22 is the diameter of the first strip-shaped portion 21. Matches the diameter of the top edge.

A mountain fold portion 26 or a valley fold portion 27 is located between the first strip-shaped portion 21 and the second strip-shaped portion 22. The mountain fold portion 26 is located at the boundary between the lower end portion of the first strip-shaped portion 21 and the upper end portion of the second strip-shaped portion 22. The valley fold portion 27 is located at the boundary between the lower end portion of the second strip-shaped portion 22 and the upper end portion of the first strip-shaped portion 21. In other words, the mountain fold portion 26 and the valley fold portion 27 partition the first and second strip-shaped portions 21, 22. The mountain fold portion 26 and the valley fold portion 27 are arranged alternately along the vertical direction of the body portion 20. The mountain fold portion 26 and the valley fold portion 27 each extend uniformly along the circumferential direction.

Next, the operation of the body portion 20 will be described.
When an obstacle such as fruit F is placed in the wind flowing in the horizontal direction, a Karman vortex is formed behind the obstacle (downstream side of the wind). Karman vortices occur during the process of wind detaching from the surface of an obstacle. Therefore, behind the fruit F, the pressure is reduced and a stress is generated in which the fruit is pulled backward. Further, since the Karman vortex is formed alternately left and right with respect to the traveling direction of the wind, the fruit F is periodically swayed to the left and right with respect to the traveling direction of the wind, which causes the fruit F to fall. Become.
According to the present embodiment, the mountain fold portion 26 and the valley fold portion 27 are alternately formed in the body portion 20 along the vertical direction. Therefore, behind the body portion 20, a plurality of Karman vortices formed between the mountain fold portions 26 and arranged in the vertical direction are formed. That is, according to the present embodiment, the Karman vortex can be divided in the vertical direction at the mountain fold portion 26, and each Karman vortex can be made smaller. As a result, it is possible to suppress the pressure drop behind the body portion 20 and reduce the stress of pulling the fruit F backward and the stress of swinging it to the left and right to suppress the fall of the fruit F.
Further, the body portion 20 of the present embodiment is circular when viewed from the vertical direction. Therefore, the above-mentioned effect can be obtained regardless of the direction in which the wind hits the body portion 20 in the horizontal plane.

The diameter D3 in the plan view of the valley fold portion 27 is formed to be slightly larger than the diameter at the time of harvesting the fruit contained in the fruit bag 1.
Further, as shown in FIG. 2, the distance (that is, pitch) D1 along the vertical direction between the adjacent mountain fold portions 26 may be 1/10 or more and 2/10 or less of the diameter D3 of the valley fold portion 27. preferable. That is, the ratio (D1 / D3) of the distance D1 between the mountain fold portions 26 to the diameter D3 of the valley fold portion 27 is preferably 1/10 or more and 2/10 or less. By setting the distance D1 to 1/10 or more of the diameter D3, it is possible to secure a sufficient distance between the mountain fold portions 26 along the vertical direction and divide the Karman vortex more reliably. Further, by setting the distance D1 to 2/10 or less of the diameter D3, a sufficient number of mountain folds 26 and valley folds 27 along the vertical direction is sufficiently secured, the Karman vortex is sufficiently divided, and the fruit F falls. Can be suppressed more reliably.
Further, the distance D2 along the radial direction between the mountain fold portion 26 and the valley fold portion 27 is preferably 0.87 / 10 or more and 1.73 / 10 or less of the diameter D3 of the valley fold portion 27. That is, the ratio (D2 / D3) of the distance D2 along the radial direction between the mountain fold portion and the valley fold portion to the diameter D3 of the valley fold portion may be 0.87 / 10 or more and 1.73 / 10 or less. preferable. By setting the distance D2 to 0.87 / 10 or more of the diameter D3, the effect of dividing the Karman vortex in the mountain fold portion 26 can be surely achieved. By setting the distance D2 to 1.73 / 10 or less of the diameter D3, it is possible to suppress an increase in the projected area of the body portion 20 and suppress an increase in the resistance coefficient of the fruit bag 1 to the wind.
Within the above range, the fruit bag 1 provided with the distances D1 and D2 is bent at about 60 ° at the mountain fold portion 26 and the valley fold portion 27.

As shown in FIG. 6, the body portion 20 can be folded in a bellows shape in the vertical direction. More specifically, the body portion 20 has a smaller vertical dimension by reducing the angle formed by the first strip-shaped portion 21 and the second strip-shaped portion 22 in the mountain fold portion 26 and the valley fold portion 27. can do. As a result, the fruit bag 1 can be stored in a space-saving state in an unused state, and the transportation cost of the fruit bag 1 can be suppressed.

Further, in the fruit bag 1, the body 20 is folded in the vertical direction, and when the operator grabs the string 2 and lifts the fruit bag 1, the body 20 is opened by the weight of the bag body 5 and FIGS. 1 to 1 to FIG. The state shown in 5 is obtained. Therefore, the procedure for opening the body portion 20 can be omitted, the work can be simplified, and the burden on the operator can be reduced.

The binding portion 10 is located on the upper side of the body portion 20 in the bag body 5, and extends upward from the upper end of the body portion 20. The upper end of the binding portion 10 is open to the upper side. A stringing portion 11 formed along the circumferential direction is provided at the upper end portion of the binding portion 10. The string 2 is inserted inside the string threading portion 11. The string threading portion 11 is provided with at least one through port 11a.

The string 2 is inserted through the string threading portion 11 of the binding portion 10. Both ends of the string 2 are pulled out from the through hole 11a. Both ends of the string 2 may be tied on the outside of the string threading portion 11. The string 2 is not limited to that made of fibers. For example, the string 2 may be composed of a wire.

When the operator pulls both ends of the string 2, most of the string 2 is pulled out from the through opening 11a, and the string threading portion 11 is squeezed. As a result, the string 2 closes the opening of the bag body 5 at the upper part of the body portion 20. Further, as shown in FIG. 1, the string 2 is preferably tied to the branch B of the tree on which the fruit F grows. In this case, even when the fruit F is separated from the branch B, it can be received in the bag body 5 and the fruit F can be prevented from falling to the ground.

<Second Embodiment>
FIG. 7 is a front view showing the fruit bag 101 of the second embodiment. The fruit bag 101 of the second embodiment has a different structure of the body 120 as compared with the above-described embodiment. The components having the same aspects as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The fruit bag 101 has a bag main body 105 and a string (string portion) 2. The bag body 105 has a tubular body portion 120, a binding portion 10 located above the body portion 120 and covering the upper opening of the body portion 120, and a binding portion 10 located below the body portion 120 and below the body portion 120. It has a bottom portion 30 that covers the side opening.

The body portion 120 has a tubular shape extending in the vertical direction (axial direction). The body portion 120 is circular when viewed from the vertical direction. A mountain fold portion 126 and a valley fold portion 127 are formed on the body portion 120 by Miura fold (registered trademark). The Miura fold is a three-dimensionally formed crease structure. The body portion 120 formed by the Miura fold can be folded in the vertical direction without causing wrinkles.

The mountain folds 126 and the valley folds 127 are arranged alternately along the vertical direction. Further, the plurality of mountain fold portions 126 are arranged along the circumferential direction. The wind passing around the body portion 120 separates at the mountain fold portions 126 arranged along the circumferential direction. Therefore, wind separation occurs in the entire circumferential direction around the body portion 120 of the present embodiment. Therefore, it is difficult to form a Karman vortex behind the body portion 120 (downstream side of the wind). As a result, the load caused by the wind applied to the fruit F can be reduced, and the fall of the fruit F can be suppressed.

Although various embodiments of the present invention have been described above, the configurations and combinations thereof in each embodiment are examples, and the configurations are added, omitted, replaced, and the like without departing from the spirit of the present invention. Other changes are possible. Further, the present invention is not limited to the embodiments.

Hereinafter, the effects of the present invention will be further clarified by examples. The present invention is not limited to the following examples, and can be appropriately modified and implemented without changing the gist thereof.

For the purpose of confirming the effect of the present invention, samples (a), (b), (c), (d), and (e) are prepared, the resistance in steady flow is measured, and each sample is based on the result. The resistance coefficient of was calculated.
Hereinafter, each sample will be described.

The sample (a) is a cylinder made of a resin material. The diameter of the cylinder is 60 mm and the height is 60 mm.
The sample (b) has a structure in which paper for a fruit bag is wrapped around the outer peripheral surface of the cylinder of the sample (a).
The sample (c) has a structure in which a paper for a fruit bag having wrinkles is wrapped around the outer peripheral surface of the cylinder of the sample (a).
The sample (d) has a structure in which a paper for a fruit bag having a Miura fold is wrapped around the outer peripheral surface of the cylinder of the sample (a). The sample (d) satisfies the configuration of the second embodiment described above. A photograph of sample (d) is shown in FIG.
The sample (e) has a configuration in which paper for a fruit bag provided with mountain folds and valley folds alternately arranged at equal intervals along the vertical direction is wound around the outer peripheral surface of the cylinder of the sample (a). .. The mountain folds and valley folds of the sample (e) extend uniformly along the circumferential direction. The sample (e) has six mountain folds and five valley folds located between them. The sample (e) satisfies the configuration of the first embodiment.

FIG. 9 shows the calculation results of the resistance coefficients of the samples (a) to (e).
As shown in FIG. 9, it was confirmed that the drag coefficient can be significantly reduced in the sample (e) corresponding to the first embodiment and the sample (d) corresponding to the second embodiment.

1,101 ... Fruit bag, 2 ... String (string part), 5,105 ... Bag body, 20,120 ... Body part, 26,126 ... Mountain fold part, 27,127 ... Valley fold part, F ... Fruit

Claims (8)

A fruit bag that holds fruits inside
It has a torso that surrounds the fruit from the horizontal direction and has a bag body that opens upward.
The body portion is provided with a fold line-shaped mountain fold portion and a fold line-shaped valley fold portion .
The mountain folds and the valley folds are the fruit bags that extend horizontally and alternate in the vertical direction . The fruit bag according to claim 1, further comprising a string portion on the upper side of the body portion for closing the opening of the bag body. The body is substantially circular when viewed from above and below.
The fruit bag according to claim 1 or 2. The fruit bag according to any one of claims 1 to 3, wherein the mountain fold portion and the valley fold portion extend uniformly along the circumferential direction. The fruit bag according to any one of claims 1 to 3, wherein the body portion is provided with a mountain fold portion and a valley fold portion by Miura fold. The fruit bag according to any one of claims 1 to 4, wherein the ratio of the distance between the mountain folds to the diameter of the valley fold is 1/10 or more and 2/10 or less. One of claims 1 to 4, wherein the ratio of the distance between the mountain fold portion and the valley fold portion along the radial direction to the diameter of the valley fold portion is 0.87 / 10 or more and 1.73 / 10 or less. The fruit bag described in. The bag body is located below the body and has a circular bottom that covers the opening under the body.
The fruit bag according to any one of claims 1 to 7.

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