JP2013203197A - Protective cover for agricultural machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective cover for an agricultural machinery in which the agricultural machinery can be preserved in a satisfactory state by preventing rusting when preserving the agricultural machinery outdoors or the like.SOLUTION: A protective cover for an agricultural machinery is comprised of a moisture-permeable and waterproof sheet whose moisture permeability is 100 g/m24hr or more. Even in outdoor preservation where much moisture is supplied because of water vapor, rusting and proceedings of rusting can be suppressed by preventing bedewing. Even an agricultural machinery which is wet with water can be dried by moisture permeability of the sheet while preserved.

Description

  The present invention relates to a protective cover for agricultural machinery that can prevent the generation of rust during storage of agricultural machinery and store the agricultural machinery in a good state.

  As a protective cover that covers agricultural machinery such as tractors and combiners when stored outdoors, Patent Document 1 describes a protective cover in which a part is a sheet material and the other part is a net member. . According to Patent Document 1, by adopting such a configuration, when covering a protective cover on an agricultural machine or the like, even if the wind is blowing, the wind escapes from the net member, so the protective cover is attached to the agricultural machine. It is described that it can be applied easily.

On the other hand, in Patent Document 2, as a moisture permeable sheet suitably used as a manure deposit covering material, the moisture permeability is 300 g / m ² · 24 hr or more, the air permeability is 5000 seconds / 100 cm ³ or less, and the tensile strength of MD and TD A moisture-permeable sheet is described in which at least one of the strengths is 9.8 N / 15 mm width or more.

JP 2004-58750 A JP 2004-174768 A

The material used in the protective cover described in Patent Document 1 is a material that is not moisture permeable, such as a vinyl sheet, and causes rust when stored on an agricultural machine once wet. There are many cases.
On the other hand, although patent document 2 has description about a moisture-permeable sheet, patent document 2 has neither description nor suggestion about using this moisture-permeable sheet for storage of agricultural machinery.

  This invention makes it a subject to provide the protective cover for agricultural machines which prevents generation | occurrence | production of rust when storing an agricultural machine outdoors etc., and can store an agricultural machine in a favorable state.

As a result of intensive studies by the present inventors, it has been found that it is preferable to use a highly moisture permeable sheet having a moisture permeability of 100 g / m ² · 24 hr or more when storing agricultural machinery, and to achieve the present invention. It came.

That is, the agricultural machine protective cover of the present invention is characterized in that it is composed of a moisture permeable waterproof sheet having a moisture permeability of 100 g / m ² · 24 hr or more.

According to the protective cover for agricultural machinery of the present invention, when the agricultural machinery is stored outdoors with the following effects, it is possible to prevent the occurrence of rust and store the agricultural machinery in a good state. .
・ Prevents condensation within the sheet and suppresses the occurrence and progression of rust.
-Prevents condensation and suppresses the generation and progression of rust even when stored outdoors where a large amount of moisture is supplied with water vapor.
・ Especially when storing in exposed parts of the soil, water vapor evaporating from the surface of the ground will be reduced.
-Even if the agricultural machine is wet with water, the agricultural machine can be dried by the moisture permeability of the sheet during storage.
-From the above, it is possible to suppress the generation and progression of rust caused by condensation across machines, tools, and parts made of metal.
By covering the agricultural machine with a sheet, it is naturally possible to prevent the agricultural machine from being soiled due to dust adhesion.

It is a photograph of the iron plate which shows the iron plate outdoor forced humidification storage test result of Example 1 and Comparative Example 1. It is an enlarged photograph of the iron plate of Example 1 of FIG. It is an enlarged photograph of the iron plate of the comparative example 1 of FIG. It is a photograph of the agricultural machine spare blade (surface) which shows the dew cycle test result of Example 2 and Comparative Example 2. It is a photograph of the agricultural machine spare blade (back surface) which shows the dew cycle test result of Example 2 and Comparative Example 2.

  DESCRIPTION OF EMBODIMENTS Embodiments of a protective cover for agricultural machinery according to the present invention will be described in detail below, but the description of the constituent elements described below is an example (representative example) of an embodiment of the present invention. The content is not specified.

The protective cover for agricultural machinery of the present invention is characterized in that it is composed of a moisture permeable waterproof sheet having a moisture permeability of 100 g / m ² · 24 hr or more.

<Moisture permeable waterproof sheet with moisture permeability of 100 g / m ² · 24 hr or more>
Since the moisture-permeable waterproof sheet used in the present invention has high moisture permeability as described later, even when used as a protective cover for agricultural machinery wet with water such as rain, while protecting the agricultural machinery, The adhering moisture can be dried, and the occurrence of rust can be suppressed. In addition, since it is excellent in waterproofness as will be described later, the agricultural protection machine can be stored outdoors even in rainy weather by using the agricultural machine protection sheet of the present invention. Further, it is possible to prevent contamination due to dust adhesion. Hereinafter, such a moisture-permeable waterproof sheet will be described in detail.

The moisture permeable waterproof sheet used in the present invention preferably has a moisture permeability of usually 100 g / m ² · 24 hr or more, preferably 300 g / m ² · 24 hr or more, more preferably 500 g / m ² · 24 hr or more. If the moisture permeability of the moisture permeable waterproof sheet is too low, an agricultural machine wet with water such as rain becomes difficult to dry and rust may be generated, which is not preferable. The upper limit of the moisture permeability of the moisture permeable waterproof sheet is not particularly limited, but it is not preferable that water passes through the sheet in a large amount in the form of liquid molecules instead of gas molecules.
In the present invention, the moisture permeability of the moisture permeable waterproof sheet is a measured value at 40 ° C. and 90% RH based on the JISZ0208 (cup method) method.

Further, this moisture-permeable waterproof sheet preferably has an air permeability of 5000 seconds / 100 cm ³ or less and at least one of MD and TD tensile strengths of 9.8 N / 15 mm width or more.
Here, MD means a machine direction, and TD means a transverse direction.

When the air permeability of the moisture permeable waterproof sheet exceeds 5000 seconds / 100 cm ³ , the air permeability is deteriorated and the drying efficiency is deteriorated.

  Also, if at least one of the tensile strength of MD and TD of the moisture permeable waterproof sheet is less than 9.8 N / 15 mm width, when used as a protective cover for agricultural machinery, the strength is insufficient and a phenomenon such as breakage occurs. There is a case. In order to obtain a sufficient strength, the tear strength is preferably 1.5 N or more.

  Moreover, it is preferable that the water pressure resistance of the moisture-permeable waterproof sheet used by this invention is 0.002 Mpa or more. Here, the water pressure resistance means a value measured according to JIS L-1092. When the water pressure resistance is 0.002 MPa or more, rainwater and water droplets do not pass through the moisture permeable waterproof sheet and reach the agricultural machine, and the purpose of covering with the moisture permeable waterproof sheet is sufficiently achieved. Particularly preferred water pressure resistance is in the range of 0.002 to 0.098 MPa, and when the water pressure resistance is 0.098 MPa or less, the moisture permeability and the air permeability are not impaired.

  The moisture permeable waterproof sheet according to the present invention is not particularly limited, but may be a laminate of a porous cloth and a porous polyolefin film. Below, the moisture-permeable waterproof sheet which consists of a laminated body of this porous cloth and porous polyolefin film is demonstrated.

<Porous cloth>
The porous fabric according to the present invention is not particularly limited, but is, for example, a split fabric, a nonwoven fabric, a woven fabric, or a net-like material made from split yarn and having a basis weight of about 10 to 500 g / m ^2. Is preferred. Among these, a nonwoven fabric or a net-like material is preferable.

  The porous cloth has air permeability, moisture permeability, flexibility, and the like, and it is important to have adhesiveness with this film in order to laminate and integrate with the porous polyolefin film described later.

  Examples of the raw material for the porous cloth include polyamide-based resins, polyester-based resins, rayon, and polyolefin-based resins. In order to improve the weather resistance, light resistance, durability and the like, it is preferable to mix various resin additives such as an ultraviolet absorber, a hindered amine light stabilizer, and a colorant in the raw material of the porous cloth.

Non-woven fabric refers to fabrics (sheets) made of fibers regardless of weaving and braiding, and is classified into dry methods, wet methods, spunbond methods, etc., depending on the fiber sheet manufacturing method, and by any of these methods It may be manufactured. The nonwoven fabric preferably has a weight per unit area in the range of 10 to 500 g / m ² , particularly 20 to 300 g / m ² .

The net-like material refers to a net-like porous cloth in which an olefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate or the like is formed in a net shape with warps and / or wefts, and the olefin resin has a width of 0.1 to 10 mm. The thickness is preferably in the range, and the thickness is preferably in the range of 10 to 300 μm, more preferably in the range of 10 to 50 μm.
As a method for producing a net-like material, the olefin resin is woven using one or both of the warp and / or the weft, or a part of the warp or the weft, or the warp and the weft are overlapped and the intersection is heat-melted. A method such as wearing can be used.

  The porous cloth may be waterproof (water repellent).

<Porous polyolefin film>
Although there is no special restriction | limiting in a porous polyolefin film, What uses the resin composition containing (A) polyolefin resin and (B) filler as a raw material is mentioned. You may mix | blend a light stabilizer, a ultraviolet absorber, a plasticizer, and a radical generator with this resin composition.

The polyolefin resin (A) used as the raw material for the porous polyolefin film is a homopolymer of ethylene or propylene, or a copolymer of ethylene or propylene and other monomers that can be copolymerized therewith, specifically, low density Polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ultra-low density polyethylene having a density of 0.910 g / cm ³ or less, polypropylene, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene- Examples include mecacrylic acid ester copolymers or mixtures thereof.

Linear low density polyethylene refers to a copolymer of ethylene and another copolymerizable α-olefin. Other α-olefins that can be copolymerized include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene, and the like. Non-conjugated dienes such as 1,4-hexadiene, dicyclopentadiene, ethylidene norbornene and the like can also be copolymerized.
These polyolefin resins (A) may be used individually by 1 type, and 2 or more types may be mixed and used for them.

Any of an inorganic filler and an organic filler may be sufficient as the filler (B) mix | blended with polyolefin resin (A). Inorganic fillers include calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, calcium oxide, Examples thereof include magnesium oxide, titanium oxide, alumina, mica, asbestos powder, glass powder, shirasu balloon, zeolite, and silicate white clay. Of these, calcium carbonate, talc, clay, silica, diatomaceous earth, barium sulfate and the like are preferable.
Examples of the organic filler include cellulose powders such as wood powder and pulp powder.
These fillers (B) may be used individually by 1 type, and 2 or more types may be mixed and used for them.

  The average particle size of the filler (B) is preferably 30 μm or less, and more preferably 0.7 to 5 μm. If the particle size is too large, the pore density of the resulting porous polyolefin film will be poor, and if the particle size is too small, the dispersibility in the resin will be poor and the moldability will be poor.

  Although there is no special restriction | limiting in the manufacturing method of a porous polyolefin film, For example, the method as described in Unexamined-Japanese-Patent No. 10-203884 etc. is employable.

<Laminated body>
Lamination of the porous polyolefin film and the porous cloth can be performed by (i) a method using an adhesive, (ii) a method using thermal bonding, or the like. Regardless of which method is used, the porous polyolefin film and the porous cloth are preferably bonded so that their bonding areas are in the range of 5 to 60% of the opposing surfaces. If the adhesion area is less than 5%, the resulting laminate has few adhesion parts, so the adhered part peels off during use, and if the adhesion area exceeds 60%, the adhesion area is too wide and the laminate. Since the air permeability, moisture permeability, and flexibility are reduced, none of them is preferable.

  The method for adhering the porous polyolefin film and the porous cloth is not particularly limited, but in order to bond using the above (i) adhesive, there is a method using a hot melt adhesive, a pressure sensitive adhesive, or the like. preferable. Examples of the hot melt adhesive that can be used in this case include resins such as polyamide, polyester, and polyolefin, tapes, and webs. In the case of the above (ii) thermal bonding, the surface of the porous cloth is heated, and when the material of the porous cloth is a thermoplastic resin, it is heated and melted while being pressed and bonded to the porous polyolefin film. A method is mentioned. Regardless of the bonding method, the bonding surface is preferably in the form of a line, a dot, a lattice, a random, or the like.

  The laminate as the moisture-permeable waterproof sheet used in the present invention is preferably a laminate having a multilayer structure such as three layers or four layers from the viewpoint of product strength. For example, such a laminate may be a three-layer laminate such as a porous cloth / porous polyolefin film / porous cloth, or a porous cloth / porous polyolefin film / porous cloth / porous cloth. A four-layer laminate is exemplified.

  Specific examples of the moisture-permeable waterproof sheet having the physical properties suitable for the present invention as described above include “Exepor DCS3”, “Excepole DCS4” manufactured by Mitsubishi Plastics, and “Tyvek” manufactured by DuPont. “Soft type / hard type”, “Tyvek 400WP”, “Tyvek 700AG”, “Tyvek 760AG”, “Tyvek 1000AG” and the like. From the viewpoint of better water resistance, “Excelport DCS3” or “Excel” Pole DCS4 "is preferred.

<Usage of the protective cover of the present invention>
The protective cover for agricultural machinery of the present invention is not particularly limited as long as the agricultural machinery can be protected by covering the agricultural machinery, and the above moisture-permeable waterproof sheet is appropriately processed so as to easily cover the agricultural machinery. Can be used. For example, by cutting the above moisture-permeable waterproof sheet, the shape thereof may be processed according to the agricultural machine to be protected, or may be processed for the purpose of improving the strength of the end of the protective cover for agricultural machine. it can.

Moreover, as a usage method of the protection cover for agricultural machines, 50% or more of the upper part of the agricultural machine and the upper side of the side peripheral part are usually 100 g / m ² · 24 hr or more. It is preferable to use it so as to be covered with a moisture permeable waterproof sheet, and 80% or more from the top of the agricultural machinery and the side periphery of the side in the height direction has a moisture permeability of 100 g / m ² · 24 hr or more. It is more preferable to use so that it may be covered with a moisture-permeable waterproof sheet. Moreover, it is particularly preferable that the entire range of the agricultural machine is used so as to be covered with a moisture-permeable waterproof sheet having a moisture permeability of 100 g / m ² · 24 hr or more.

<Agricultural machinery suitable for using the protective cover of the present invention>
Examples of the agricultural machine to which the protective cover of the present invention can be used include, but are not limited to, a combine, a whole crop harvester, a mower conditioner, a combine baler, a disk mower, a corn harvester, and the like.

  The main part of these agricultural machines is usually composed of iron and is likely to generate rust, and the rust generation preventing effect due to the high moisture permeability of the protective cover for agricultural machines of the present invention is effectively exhibited.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the description of the following examples unless it exceeds the gist.

[Steel plate outdoor forced humidification storage test]
[Example 1]
An iron plate outdoor forced humidification storage test was conducted in Miyazaki Prefecture. Specifically, on the concrete, on an iron plate (Asahi Steel Co., Ltd., 15 cm x 40 cm, thickness 0.5 cm), a moisture permeable waterproof sheet manufactured by Mitsubishi Plastics Co., Ltd. (trade name) EXEPOL (registered trademark) DCS4 "(moisture permeability of 4681 g / m ² · 24 hr, MD direction tensile strength of 193 N / 15 mm width, TD direction tensile strength of 160 N / 15 mm width, air permeability of 600 to 800 seconds / 100 cm ³ , water pressure resistance of 0.049 MPa) The steel plate was covered and stored so that the entire range of the iron plate was covered. A weight was placed around the iron plate to prevent the moisture-permeable waterproof sheet from being blown by the wind.

[Comparative Example 1]
Example 1 is the same as Example 1 except that a flameproof sheet (polyester cloth PVC-laminated; made by Fire Department Registrant No. F-12-0428) is used instead of the moisture permeable waterproof sheet. An iron plate outdoor forced humidification storage test was conducted under the conditions described above.

[result]
In Example 1 and Comparative Example 1 as well, no clear rusting phenomenon was observed from the start of the test to 21st. Note that the weather conditions during this period were sunny 6 days, cloudy 12 days, and rain 3 days.

[Accelerated test]
Next, an acceleration test was performed. Specifically, the entire area of the iron plate is directly covered with gauze soaked in water and squeezed until water drops do not drip, and then covered with a moisture permeable waterproof sheet (Example 1) or a disaster prevention sheet (Comparative Example 1). They were stored outdoors (in the same place where they were stored from the start of the test until the 21st day), and the rust occurrence status was compared. Note that the weather conditions during this period were sunny 6 days, cloudy 3 days, and rain 1 day.

[result]
On the 31st day from the start of the test (that is, the 10th day from the start of the acceleration test), a phenomenon that a lot of rust adhered to the gauze and the disaster prevention sheet used in Comparative Example 1 was confirmed. Further, in Comparative Example 1, when the gauze was peeled off, wetting of the iron plate and generation of rust were confirmed (see FIGS. 1 and 3).
On the other hand, on the 31st day from the start of the test, the occurrence of rust on the gauze and the moisture-permeable waterproof sheet used in Example 1 was negligible, and when the gauze was peeled off, the iron plate was in a dry state, and rust was generated. There was very little (see FIGS. 1 and 2).
From these results, even if the moisture permeable waterproof sheet according to the present invention is stored on, for example, an iron agricultural machine wet with rain, the moisture permeable waterproof sheet according to the present invention is excellent in moisture permeability. It can be seen that the rust can be dried and the occurrence of rust can be suppressed.

[Condensation cycle test]
[Example 2]
A dew cycle test was conducted using a dew cycle test apparatus (constant temperature and humidity chamber (low humidity), ESPEC DCH-200-W). Specifically, the entire range of the agricultural machine replacement blade (Takakita Co., Ltd., width 7.5 cm × length 8.1 cm, blade span 6.3 cm, thickness 0.3 cm) is a moisture permeable waterproof sheet (used in Example 1). And the sample was allowed to stand in a condensation cycle test apparatus. Conditions such as temperature were repeated three times: a room temperature of 20 ° C. and a humidity of 40% (1 hour) followed by a cycle of room temperature of 60 ° C. and a humidity of 80% (1 hour), and then a room temperature of 20 ° C. and a humidity of 40 % Condition and stored for 1 hour.

[Comparative Example 2]
In Example 2, a dew cycle test was performed under the same conditions as in Example 2 except that a blue sheet (manufactured by Takeda Corporation) was used instead of the moisture-permeable waterproof sheet.

[result]
As a result of confirming the occurrence of rust, the number of rust occurrences is clearly greater in Comparative Example 2 than in Example 2 on both the front and back of the agricultural machine replacement blade, and the area of rust occurrence is also in Comparative Example 2 than in Example 2. Was larger (see FIGS. 4 and 5).
This result also shows that according to the protective cover for agricultural machinery of the present invention, the agricultural machinery can be stored in a good state without generating rust.

Claims (1)

A protective cover for agricultural machinery comprising a moisture permeable waterproof sheet having a moisture permeability of 100 g / m ² · 24 hr or more.

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