Flame-retardant porous sheet for pruning work

Abstract

To provide an antiflaming porous body sheet for pruning work which improves a working environment in a pruning work on a farm field during winter, and enhances work efficiency and safety.SOLUTION: An antiflaming porous body sheet for pruning work is made up of synthetic resin fiber with an area of 7 m2 to 20 m2, a thickness of 0.8 mm to 1.5 mm, a shape of a pore being a circular or square-shape, a size of the pore of 0.8 mm to 2 mm, and a porosity of 2% to 10%, and its peripheral part is reinforced by a reinforcing member, where both sides of the sheet are coated with polyvinyl chloride resin.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a flame-retardant porous sheet for pruning work that improves the working environment during pruning work in farm fields and increases the efficiency and safety of the work. [Background technology]

[0002] For farmers, field pruning is an important task for ensuring stable crop harvests, and for fruit farmers in particular, pruning fruit trees is one of the most important tasks. Fruit tree pruning, which involves cutting off branches, shaping, training, and collecting cut branches, must be carried out after fruit harvesting and before spring, when new buds swell, in order to maintain and expand the tree's vigor. Fruit tree pruning is often carried out in the winter, from December onwards, due to the need for other work, and long hours of pruning work in the field require harsh conditions. Winter pruning poses challenges, not only due to the low temperatures, but also due to the muddy conditions that can occur when frost pillars melt in the afternoon in some areas, making the pruning environment even more difficult. Therefore, improvements to the working environment during pruning work were desired.

[0003] Pruning fruit trees is a tough job for workers, as it is usually done in a standing or bent-over position for long periods of time in such a harsh working environment. Heavy labor in an awkward position and frequent weight shifting in an environment with cold winds and cold air at the feet places a heavy load on the ankles, knees, etc., often resulting in poor circulation, muscle fatigue, muscle pain, swelling, etc.

[0004] In an effort to alleviate the harsh conditions of pruning fruit trees, some people bring in heaters such as stoves to keep them warm. However, because the air is dry in winter, there is a risk that pruned branches will catch fire and spread if they come into contact with the stove's flame. Furthermore, the heat from heaters such as stoves accelerates the melting of frost pillars, resulting in the problem of large amounts of mud.

[0005] On the other hand, it has long been known to use protective films, protective bags, protective nets, and other equipment to protect harvested fruits and vegetables from cold weather and bird damage, but sufficient consideration has not been given to the workers who work in harsh environments, and there has not been much knowledge of tools or implements to improve the harsh working environment of workers in fields.

[0006] As for general-purpose work mats, Patent Document 1 provides a rubber mat that has excellent shock absorption, fatigue reduction, and slip prevention effects, as well as excellent durability, and Patent Document 2 provides a work mat that has a high compressibility against load, a high cushioning effect, and provides a high sense of stability. However, unlike these general-purpose work mats, there are almost no known sheets or mats that are specifically designed for pruning work. Patent Document 3 provides a platform suitable for fruit thinning and picking, which is made of polyethylene foam with an expansion ratio of 20 to 50 times, has approximately parallel upper and lower surfaces, is square or rectangular on all sides, has holes for inserting strings, and has numerous recesses or protrusions on the upper surface to prevent slipping. Furthermore, Patent Document 4, filed by the same applicant, provides a porous sheet for pruning work that has excellent heat insulation and workability to prevent environmental deterioration during pruning work in fields, mainly in winter. These tools, as pruning platforms or sheets, contribute to a certain improvement in the working environment during pruning work.

[0007] However, as mentioned above, pruning work, especially pruning of fruit trees, is often carried out in the winter from December onwards, so there was a need for a pruning sheet that could be used safely and increase work efficiency even when working using heating equipment such as stoves. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-46152 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-44178 [Patent Document 3] Japanese Utility Model Application Publication No. 6-49650 [Patent Document 4] Japanese Patent Application Laid-Open No. 2011-172770 Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the fact that pruning work in farm fields, particularly in winter, is carried out in harsh working environments, the present invention aims to provide a porous sheet for pruning work that can contribute to improving such working environments and increase the efficiency and safety of work. [Means for solving the problem]

[0010] As a result of research into solving the above problems, the inventors discovered that a porous sheet for pruning work that has a specific size and thickness, is made of synthetic resin fibers, has a specific porosity, and has reinforced edges can be obtained by coating both sides with polyvinyl chloride resin, thereby obtaining a porous sheet for pruning work that improves work efficiency and safety, and thus completed the present invention. The present invention is as defined by the following specific features.

[0011] (1) Area is 7m 2 ~20m 2 A flame-retardant porous sheet for pruning work, which is made of synthetic resin fibers with a thickness of 0.8 mm to 1.5 mm, has a porosity of 2% to 10%, and has its peripheral edges reinforced with reinforcing members, and is coated with polyvinyl chloride resin. (2) A flame-retardant porous sheet for pruning work according to (1), characterized in that the synthetic resin fiber is a polyester fiber. (3) A flame-retardant porous sheet for pruning work according to (1) or (2), characterized in that the holes formed in the porous sheet are circular or square and have a size of 0.8 mm to 2 mm. (4) A flame-retardant porous sheet for pruning according to any one of (1) to (3), characterized in that the reinforcing member at the periphery of the porous sheet is a tape, a tube, a rod or an eyelet. (5) A flame-retardant porous sheet for pruning according to any one of (1) to (4), characterized in that both surfaces of the porous sheet are coated with polyvinyl chloride resin. (6) Polyvinyl chloride resin porous sheet 1 m 2 The flame-retardant porous sheet for pruning according to any one of (1) to (5), characterized in that it covers 400 to 500 g per tree. [Effects of the Invention]

[0012] According to the present invention, a porous sheet having a specific size and thickness, a specific porosity made of synthetic resin fibers, and reinforced at the periphery is coated with polyvinyl chloride resin and flame-retardant processed, thereby improving the working environment during pruning work and ensuring work efficiency and safety. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of a flame-retardant porous sheet for pruning work. [Figure 2] FIG. 2 is a partial cross-sectional view of a flame-retardant porous sheet for pruning work. DETAILED DESCRIPTION OF THE INVENTION

[0014] The flame-retardant porous sheet for pruning according to the present invention is characterized by a porous sheet having a specific size and thickness, a specific porosity made of synthetic resin fibers, a reinforced periphery, and a flame-retardant coating of polyvinyl chloride resin, making it particularly suitable for pruning work in winter. It has been common practice to use flexible resin sheets to clear away branches cut during pruning when pruning fruit trees in a field. However, the flame-retardant porous sheet for pruning according to the present invention not only functions as a flexible resin sheet conventionally used for clearing away cut branches, but also has the function of improving the working environment for workers pruning fruit trees in a field in winter, thereby increasing work efficiency and safety. Specific embodiments for implementing this aspect are described below.

[0015] The area of ​​the flame-retardant porous sheet for pruning work according to the present invention is 7 m 2 ~20m 2 In the present invention, it is desirable that the size of the porous sheet is 7 m. 2 ~20m 2 However, this area is based on the function of the tree as a tray for branches cut off during pruning. 2 If the area is less than 20m, the area required to accommodate the branches cut off during pruning is small, so the position of the porous sheet must be moved frequently, resulting in poor work efficiency. Also, if the branches cannot be accommodated in the porous sheet, the pruned branches will touch the ground and become dirty, soiling the porous sheet and making it difficult to store the porous sheet. 2 If this amount exceeds this, it becomes difficult to move the sheet between the fruit trees planted in the field, making it difficult to use flexibly and taking up space when storing it after use.

[0016] The thickness of the flame-retardant porous sheet for pruning according to the present invention is preferably 0.8 mm to 1.5 mm. If the thickness of the porous sheet is thinner than 0.8 mm, it becomes difficult to maintain the strength required as an underlayment, and the insulation of cold air from the ground may be insufficient, resulting in insufficient heat retention. Furthermore, if the thickness of the porous sheet is thicker than 1.5 mm, the porous sheet may not be able to fit well to the ground when in contact with it, and its stability on the ground surface may be impaired. Furthermore, an increase in the thickness of the porous sheet results in an increase in weight, which may reduce the efficiency of work when transporting or moving the porous sheet.

[0017] The flame-retardant porous sheet for pruning according to the present invention is preferably made of synthetic resin fibers. The synthetic resin fibers that can be used in the porous sheet according to the present invention are not particularly limited as long as they are thermoplastic resins, but examples include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as cellulose diacetate and cellulose triacetate, acrylic polymers such as polymethyl methacrylate, styrene polymers such as polystyrene and acrylonitrile-styrene copolymer (AS resin), polyolefins such as polyethylene and polypropylene, vinyl chloride polymers, polyamides, etc. From the viewpoints of ease of processing, abrasion resistance, flexibility, rigidity, price, etc., as a flame-retardant porous sheet for pruning, polyester fibers are preferred.

[0018] The flame-retardant porous sheet for pruning according to the present invention preferably has a porosity of 2% to 10% by providing holes of a specific diameter. The holes provided in the porous sheet according to the present invention are not particularly limited as long as they have a diameter of 0.8 mm to 1.5 mm. They can be circular, rectangular, or any combination thereof, and may be interconnected. Providing holes of 0.8 mm or larger in size in the sheet allows the sheet to easily conform to uneven ground and provides stability, thereby preventing slippage on the porous sheet and allowing safe walking on the sheet. Furthermore, the maximum diameter of the holes is approximately 1.5 mm. If the holes are 2.0 mm or larger and interconnected, the effectiveness of blocking cold air from the ground may be impaired. Furthermore, there is a risk that muddy soil from thawed fields may leak through the holes to the upper surface of the porous sheet. The porous sheet according to the present invention is preferably provided with a large number of holes of a specific diameter so that the porosity is 2% to 10%. By setting the porosity of the porous sheet in this range, it is possible to achieve the desired effect of blocking cold air from the ground or the desired heat retention effect, and also to prevent the sheet from becoming excessively heavy.

[0019] The peripheral edge of the flame-retardant porous sheet for pruning according to the present invention is desirably reinforced with a reinforcing member. The peripheral edge of the flame-retardant porous sheet for pruning according to the present invention is provided with a reinforcing member such as reinforcing tape, a tubular body such as a bamboo pole, or a rod, and the peripheral edge is provided with grommets for fixing and storing the porous sheet. The method for reinforcing the peripheral edge of the porous sheet is not particularly limited, but for example, the peripheral edge can be reinforced by attaching a reinforcing tape, a tubular body such as a bamboo pole, or a rod to the peripheral edge of the flame-retardant porous sheet for pruning, folding the peripheral edge of the sheet back by about 3.5 cm to 5 cm to enclose the reinforcing member, and then sewing the folded-back portion. Furthermore, the grommets provided on the periphery of this porous sheet can be attached to the tension wires of the trellis or to stakes or pipes to raise the periphery of the porous sheet and prevent the scattered branches from scattering, allowing for efficient branch collection. Furthermore, when work in a certain area is completed, the pruner can move to the next area by grasping the string threaded through the grommets or the surrounding reinforcement and continue pruning. To facilitate such work, the size of the grommets is preferably larger than that of grommets provided on general pruning sheets, approximately 3 cm to 4.5 cm. In this way, the flame-retardant porous sheet for pruning according to the present invention can be deployed in the work area of ​​the field, pruning work can be started on the porous sheet, and the cut branches can be collected by manually manipulating the sheet once the pruning work is completed. Furthermore, when manipulating the porous sheet, one side of the grommets can be fixed to the trellis wire or parent tree to allow for efficient collection.

[0020] The flame-retardant porous sheet for pruning according to the present invention is preferably coated with polyvinyl chloride resin. The porous sheet according to the present invention is preferably coated on both sides with polyvinyl chloride resin, and by coating both sides, both sides of the porous sheet can be used evenly. The method for coating the porous sheet with polyvinyl chloride resin is not particularly limited, but a normal pressure immersion method in which the porous sheet is immersed in a polyvinyl chloride resin solution and dried is preferred as a simple method.

[0021] One of the purposes of coating a porous sheet with polyvinyl chloride resin in the present invention is to provide the porous sheet with a flame-retardant finish. Flame-retardant refers to the property that even when exposed to a small fire source such as a match or lighter, the area exposed to the flame simply scorches, but does not easily ignite, and even if it does ignite, it is self-extinguishing and does not spread. This is an important characteristic required of pruning sheets from a safety perspective, as pruning work, particularly fruit tree pruning, is performed in the winter when heaters such as stoves are used. Therefore, the amount of polyvinyl chloride resin coated on the porous sheet must be an amount that ensures sufficient flame-retardant effect in the polyvinyl chloride resin-coated porous sheet. On the other hand, increasing the amount of polyvinyl chloride resin coated on the porous sheet is expected to improve both the flame-retardant effect and weather resistance, but it also increases the weight of the porous sheet, making it difficult to handle, and blocking the pores in the porous sheet changes the porosity due to the pores, potentially making it difficult to adjust the porosity. Therefore, in order to obtain an appropriate flame retardant effect, increase weather resistance, and maintain an appropriate porosity, the amount of polyvinyl chloride resin to be coated on the porous sheet varies depending on the level of flame retardant processing given to the porous sheet, the porosity of the porous sheet, etc., but it is preferable to coat 1 m of the porous sheet with polyvinyl chloride resin. 2 It is preferable to coat about 400 to 500 g per 1 m of porous sheet. 2 It is more preferable that the weight is about 470g per serving.

[0022] Another purpose of coating a porous sheet with polyvinyl chloride resin is to improve weather resistance, as mentioned above. For example, a porous sheet made of polyester resin is coated with polyvinyl chloride resin for 1 m. 2 It has been confirmed that when approximately 470g of coating is applied per unit area, weather resistance of more than 7 years can be achieved.

[0023] The flame-retardant porous sheet for pruning work according to the present invention has been explained above based on each of its technical aspects. By combining the above-mentioned technical aspects, the flame-retardant porous sheet for pruning work according to the present invention can maintain optimal conditions for workability, cost, heat retention, safety, etc.

[0024] The flame-retardant porous sheet for pruning of the present invention will be specifically described below with reference to Figures 1 and 2. Figure 1 is a plan view of a typical flame-retardant porous sheet for pruning of the present invention (1), where (2) is a hole provided in the sheet. Also, (3) is a reinforcing portion formed by folding back the peripheral portion with a reinforcing member such as hard tape inserted, and (4) is a grommet provided in the reinforcing portion. The grommet (4) can be appropriately provided depending on the size of the flame-retardant porous sheet for pruning (1). Figure 2 is a partial cross-sectional view of the flame-retardant porous sheet for pruning (1), where both sides of the sheet are coated with polyvinyl chloride resin (5), and (2) is a hole provided in the sheet. (3) is a reinforcing portion formed by folding back the peripheral portion of the sheet, and (4) is a grommet. In FIG. 2, the shape of the holes (2) is shown as a simple, interconnected shape, but the shape of the holes (2) may be a circle, a square, or any combination thereof.

[0025] The eyelets (4) shown in Figures 1 and 2 can be fitted with suitable hooks or strings to fasten the flame-retardant porous sheet for pruning according to the present invention to stakes in the field or tension wires on trellises in an orchard, thereby preventing the branches to be pruned from scattering. [Industrial Applicability]

[0026] Pruning of fruit trees is essential for producing high-quality fruit, but this work is often carried out in the harsh winter conditions, placing a heavy burden on workers. The flame-retardant porous sheet for pruning of the present invention can be used as a tool to carry out pruning work more efficiently and safely during the harsh winter working environment. [Explanation of symbols]

[0027] 1. Fire-retardant porous sheet for pruning work 2 holes 3 Reinforcement 4 Eyelets 5. Covering part (polyvinyl chloride resin)

Claims

1. The area is 7m ２ ~20m ２ A flame-retardant porous sheet for pruning work is a porous sheet made of synthetic resin fibers having a thickness of 0.8 mm to 1.5 mm, having a porosity of 2% to 10%, and having a peripheral portion reinforced by a reinforcing member, characterized in that the porous sheet is coated on both sides with polyvinyl chloride resin and is coated with 400 to 500 g of polyvinyl chloride resin per 1 m 2 of the porous sheet.

2. 2. The flame-retardant porous sheet for pruning work according to claim 1, wherein the synthetic resin fiber is a polyester fiber.

3. The flame-retardant porous sheet for pruning work according to claim 1 or 2, characterized in that the holes provided in the porous sheet have a circular or square shape and a hole size of 0.8 mm to 2 mm.

4. The flame-retardant porous sheet for pruning work according to any one of claims 1 to 3, characterized in that the reinforcing member on the peripheral edge of the porous sheet is a tape, a tube, a rod or an eyelet.

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