Disaster relief sheets, car shelters, and car covers

Abstract

To provide disaster relief sheets with excellent impact resistance and wind resistance. [Solution] The disaster relief sheet of the present invention includes a polyethylene terephthalate woven fabric formed by plain weaving strip-shaped PET film in the warp and weft directions.

Description

Technical Field

[0001] The present invention relates to a disaster sheet, a vehicle shelter, and a vehicle cover.

Background Art

[0002] Various developments have been made on disaster sheets so far. As a technique of this type, for example, the technique described in Patent Document 1 is known. Patent Document 1 describes a hail protection sheet. It is described that this hail protection sheet includes an inner layer made of non-friction soft nylon, an intermediate layer made of viscoelastic rubber having vibration absorption properties, and an outer layer made of treated nylon.

Prior Art Documents

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, as a result of studies conducted by the present inventors, it has been found that the sheet laminated with nylon and rubber as described in the above Patent Document 1 has no ventilation structure, and thus there is room for improvement in terms of wind resistance.

Means for Solving the Problem

[0005] The present inventors have conducted further studies focusing on the material and structure of disaster sheets. As a result of intensive studies, the present inventors have found that impact resistance and wind resistance can be improved by using polyethylene terephthalate as the material and a plain weave structure in combination for a disaster sheet, thereby completing the present invention.

[0006] According to one aspect of the present invention, the following disaster relief sheets, car shelters, and car covers are provided. 1. A disaster relief sheet comprising polyethylene terephthalate woven fabric formed by plain weaving strip-shaped PET film in the warp and weft directions. 2. Disaster relief sheets as described in 1., A disaster relief sheet comprising the aforementioned strip-shaped PET film with a width of 3 cm or more. 3. Disaster relief sheets as described in 1. or 2., A disaster relief sheet comprising a strip of PET film with a thickness of 50 μm or more and 200 μm or less. 4. A disaster relief sheet described in any one of items 1 to 3, The area of ​​the aforementioned polyethylene terephthalate woven fabric is 5 m² 2 Over 50m 2 The following is a disaster relief sheet. 5. A disaster relief sheet described in any one of items 1 to 4, A disaster relief sheet in which the weight of the polyethylene terephthalate woven fabric is 30 kg or less. 6. A disaster relief sheet described in any one of items 1 to 5, A disaster relief sheet in which the entangled portions of the longitudinal strip-shaped PET film and the weft strip-shaped PET film are not fixed. 7. A disaster relief sheet described in any one of items 1 to 6, A disaster relief sheet in which, within the polyethylene terephthalate woven fabric, the distance between two adjacent strip-shaped PET films in the multiple warp directions is 0 cm or more and 2 cm or less. 8. A disaster relief sheet described in any one of items 1 to 7, This disaster relief sheet is designed for use in hailstorms. 9. A tensegrity vehicle shelter including a disaster relief sheet as described in any one of items 1-8. 10. A car cover with a magnetic roof rack structure, including a disaster relief sheet as described in any one of items 1-8. [Effects of the Invention]

[0007] According to the present invention, a disaster sheet excellent in impact resistance and wind resistance, and a vehicle shelter and a vehicle cover using the same are provided. [Brief Description of the Drawings]

[0008] [Figure 1] This is a top view schematically showing an example of the configuration of the disaster sheet having the polyethylene terephthalate woven fabric according to the present embodiment. [Figure 2] This is a perspective view schematically showing an example of the configuration of a vehicle shelter with a tensegrity structure. [Figure 3] This is a perspective view schematically showing an example of the configuration of a vehicle cover with a magnet roof carrier structure. [Figure 4] This is a diagram for explaining a test for evaluating impact resistance. [Figure 5] This is a diagram for explaining a test for evaluating wind resistance. [Mode for Carrying Out the Invention]

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in all the drawings, the same constituent elements are denoted by the same reference numerals, and descriptions thereof are omitted as appropriate. In addition, the drawings are schematic diagrams and do not match the actual dimensional ratios.

[0010] The disaster sheet of the present embodiment will be described.

[0011] The disaster sheet of the present embodiment includes a polyethylene terephthalate woven fabric formed by plain-weaving strip-shaped PET films in the warp direction and the weft direction.

[0012] Figure 1 schematically shows an example of the configuration of the disaster sheet 10 having a polyethylene terephthalate woven fabric.

[0013] Polyethylene terephthalate woven fabric is a resin fabric in which strip-shaped PET film 1 arranged in the warp direction and strip-shaped PET film 2 arranged in the weft direction perpendicular to the warp direction intersect alternately every other strip. In other words, polyethylene terephthalate woven fabric is composed of a PET plain weave structure sheet.

[0014] According to the inventors' findings, a plain weave structure provides an impact-absorbing structure through force distribution by multi-point contact and force relaxation by deformation, thereby improving impact resistance. Furthermore, it provides a ventilated structure that allows wind to pass through, reducing the force exerted on the sheet surface by fluids such as wind (improving wind resistance). In addition to these structural findings, it has been found that by adopting polyethylene terephthalate as the material, impact resistance can be further improved compared to polyester and polycarbonate. Based on the above, it is possible to create a disaster relief sheet with excellent impact resistance and wind resistance.

[0015] The film width D1 of at least one of the strip-shaped PET films 1 and 2 is, for example, 3 cm or more, preferably 4 cm to 10 cm, and more preferably 5 cm to 8 cm. By setting the film width D1 to be greater than or equal to the lower limit above, impact resistance can be further improved. By setting the film width D1 to be less than or equal to the upper limit above, ventilation can be further improved. The film widths D1 of the multiple strip-shaped PET films 1 and 2 may be the same or different.

[0016] The thickness of at least one of the strip-shaped PET films 1 and 2 is, for example, 50 μm or more and 200 μm or less, preferably 75 μm or more and 175 μm or less, and more preferably 100 μm or more and 150 μm or less. By setting the film thickness above the lower limit, impact resistance can be further improved. By setting the film thickness below the upper limit, weight reduction can be achieved.

[0017] The area of ​​polyethylene terephthalate woven fabric is, for example, 5 m². 2Over 50m 2 Preferably 7m 2 Over 45m 2 Below, a more convenient 9m 2 Over 40m 2 The following applies: The area of ​​the polyethylene terephthalate woven fabric can be appropriately set according to the size of the object to be protected.

[0018] The weight of the polyethylene terephthalate woven fabric is, for example, 30 kg or less, preferably 0.35 kg to 27.5 kg, and more preferably 0.5 kg to 25 kg. By keeping the weight of the polyethylene terephthalate woven fabric above the lower limit mentioned above, wind resistance can be further improved. By keeping the weight of the polyethylene terephthalate woven fabric below the upper limit mentioned above, weight reduction can be achieved.

[0019] In polyethylene terephthalate woven fabric, it is preferable that at least a portion, preferably all, of the entangled portions between the warp-oriented strip PET film 1 and the weft-oriented strip PET film 2 are not fixed. By making the entangled portions unfixed, ventilation and shock absorption can be further improved.

[0020] While hail is a preferred example of a disaster in which polyethylene terephthalate woven fabric is used, it is not limited to this. Hail contains ice particles with a diameter of 5 mm or larger. Sleet, on the other hand, contains ice particles with a diameter of less than 5 mm. Hailstorms can cause disasters such as agricultural damage and damage to buildings and vehicles.

[0021] The disaster relief sheet 10 can be suitably used as a hail protection sheet for automobiles. Statistical data shows that 85% of hailstones that fall to the ground are 5 cm or smaller. Disaster relief sheet 10 can effectively mitigate damage caused by hailstones of this size.

[0022] Ice particles smaller than 2 cm often do not cause significant damage to vehicles. Therefore, from the viewpoint of breathability and weight reduction, the polyethylene terephthalate woven fabric may have minute slits between adjacent strip-shaped PET films 1 and 2. Specifically, in polyethylene terephthalate woven fabric, the distance D2 between two adjacent warp-oriented PET films 1 is preferably 0 cm or more and 2 cm or less. Similarly, the distance D2 between two adjacent weft-oriented PET films 2 is preferably 0 cm or more and 2 cm or less.

[0023] Examples of hail protection sheets for automobiles, including disaster relief sheets, include car shelters and car covers.

[0024] Figure 2 schematically shows an example of a tensegrity structure vehicle shelter, including a disaster relief sheet 10. Figure 3 schematically shows an example of a car cover with a magnetic roof carrier structure, including a disaster relief sheet 10.

[0025] The car shelter shown in Figure 2 and the car cover shown in Figure 3 only need to have a disaster relief sheet 10 at least on the upper part of the car, and if necessary, the disaster relief sheet 10 may also be located on the front, rear, and one or more of the left and right sides of the car. However, the car shelter and car cover may also have a wind-resistant net other than the disaster relief sheet 10 on some parts of the left and right sides.

[0026] Although embodiments of the present invention have been described above, these are merely examples, and various other configurations can be adopted. Furthermore, the present invention is not limited to the embodiments described above, and modifications, improvements, etc., within the scope that can achieve the objectives of the present invention are included in the present invention. [Examples]

[0027] The present invention will be described in detail below with reference to examples, but the present invention is not limited in any way to the descriptions of these examples.

[0028] <Manufacturing of disaster relief sheets> (Example 1) A sheet-like PET film with a thickness of 125 μm was prepared. A sheet of PET film was cut into 3cm wide strips to create multiple strip-shaped PET films 1 and 2. A strip of PET film 1 arranged in the warp direction and a strip of PET film 2 arranged in the weft direction perpendicular to the warp direction were woven together, alternating between each other and crossing each other, and the outer edge was secured with tape to produce the PET plain weave structure sheet (disaster relief sheet) of Example 1. At this time, the spacing between adjacent strip-shaped PET films 1 and 2 was set to 2 mm or less.

[0029] (Example 2) A PET plain weave structured sheet of Example 2 was prepared in the same manner as in Example 1, except that the width of each strip-shaped PET film 1 and 2 was changed to 5 cm.

[0030] (Comparative Example 1) A sheet of PET film with a thickness of 125 μm was used as a disaster relief sheet. (Comparative Example 2) A sheet of polyester film with a thickness of 125 μm was used as a disaster relief sheet. (Comparative Example 3) A sheet of polycarbonate film with a thickness of 125 μm was used as a disaster relief sheet.

[0031] The following items were evaluated for the disaster relief sheets of Examples 1-2 and Comparative Examples 1-3 described above.

[0032] <Evaluation of impact resistance> As shown in Figure 4, the disaster relief sheets 10 of each example and comparative example were fixed to a support base using tape, and a drop test was conducted in which a 2 kg steel ball was dropped onto the evaluation area from a height of 1.5 m. Furthermore, tape was used to secure the top, bottom, left, and right edges of the disaster relief sheet 10 with a width of 7.5 cm each, and the dimensions of the evaluation area of ​​the disaster relief sheet 10 where tape was not present were set to 15 cm x 15 cm. Drop tests were repeatedly conducted, and the number of tests required for the disaster relief sheet 10 to be penetrated was measured. The conditions for dropping a 2kg iron ball from a height of 1.5m were defined as being equivalent to the kinetic energy of a 50mm hailstone falling from an altitude of 1000m at a falling speed of 115km / h. As a result, Comparative Example 2 was penetrated on the first attempt, Comparative Example 3 was penetrated on the second attempt, and Comparative Example 1 was penetrated on the third attempt. On the other hand, Example 1 was penetrated on the thirteenth attempt, and Example 2 was not penetrated even on the fifteenth attempt.

[0033] <Evaluation of wind resistance> In Examples 1 and 2 above, a PET plain weave structure sheet with dimensions of 15 cm x 15 cm was prepared, and a sheet-like test specimen weighing 10 g was prepared. Similarly, in Comparative Examples 1 to 3, two sheets of the above 15 cm x 15 cm film were stacked together to prepare a sheet-like test specimen weighing 10 g. As shown in Figure 5, one end of a cylinder with an inner diameter of 10 cm was pressed against the surface of a sheet-like test specimen, and a wind of 10 m / s was blown in from the other end. The distance the test specimen was thrown (cm) was then measured. The flight distance was measured 15 times (N=15) for each test specimen in each example and comparative example, and the average of these measurements was used. In Examples 1 and 2, the average flight distance was 28 cm, while in Comparative Examples 1 to 3, the average flight distance was 50 cm. As a result, it was found that the test specimens of Examples 1-2 had a flight distance reduced to about half that of the test specimens of Comparative Examples 1-3 (they were less likely to be blown away by strong winds).

[0034] Based on each evaluation item, the disaster relief sheets of Examples 1 and 2 showed superior impact resistance and wind resistance compared to Comparative Examples 1 and 3. [Explanation of Symbols]

[0035] 1. Strip-shaped PET film 2. Strip-shaped PET film 10. Disaster relief sheet

Claims

1. A disaster relief sheet containing polyethylene terephthalate woven fabric, which is formed by plain weaving strip-shaped PET film in the warp and weft directions.

2. A disaster relief sheet according to claim 1, A disaster relief sheet comprising a strip of PET film with a width of 3 cm or more.

3. A disaster relief sheet according to claim 1 or 2, A disaster relief sheet comprising a strip of PET film with a thickness of 50 μm or more and 200 μm or less.

4. A disaster relief sheet according to claim 1 or 2, The area of ​​the aforementioned polyethylene terephthalate woven fabric is 5 m² ２ Over 50m ２ The following is a disaster relief sheet.

5. A disaster relief sheet according to claim 1 or 2, A disaster relief sheet in which the weight of the polyethylene terephthalate woven fabric is 30 kg or less.

6. A disaster relief sheet according to claim 1 or 2, A disaster relief sheet in which the entangled portions of the longitudinal strip-shaped PET film and the weft-shaped strip-shaped PET film are not fixed.

7. A disaster relief sheet according to claim 1 or 2, A disaster relief sheet in which, within the polyethylene terephthalate woven fabric, the distance between two adjacent strip-shaped PET films in the longitudinal direction is 0 cm or more and 2 cm or less.

8. A disaster relief sheet according to claim 1 or 2, This disaster relief sheet is designed for use in hailstorms.

9. A tensegrity vehicle shelter comprising a disaster relief sheet according to claim 1 or 2.

10. A car cover with a magnetic roof carrier structure, including the disaster relief sheet described in claim 1 or 2.

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