TW202117220A - Steam spray hose - Google Patents

Abstract

To provide a steam spray hose in which steam leakage does not occur even when high-temperature steam is passed through the hose. A steam spray hose (10) in which a cylindrical resin hose 21 comprising an inner layer 11, an outer layer 13, and an intermediate layer 12 is flattened, wherein both width-direction ends thereof are provided with a folded side part 15 that affixes upper and lower sheets, the folded side part being formed along the length direction of the cylindrical hose. In such a cylindrical hose, the inner layer is preferably formed from polypropylene and the outer layer is preferably formed from nylon. Moreover, the folded side part is preferably formed by flattening the cylindrical hose 21 and affixing both width-direction ends. Moreover, the thickness T1 of the folded side part is preferably less than the thickness T2 of parts other than the folded side part.

Description

Hose for steam ejection

The present invention relates to a steam spray hose used for steam sterilization of soil that is heated by steam to kill pathogenic bacteria of gardening crops, weed seeds, and the like.

In our country's facility gardening, methyl bromide, which has been used as a soil disinfectant for a long time, has been banned as an ozone-depleting agent, so soil disinfection by steam is widely used. The steam soil disinfection method is a method of laying a tube-shaped canvas hose made of extremely thick cotton cloth on the surface of the soil, and spraying steam from the cloth pattern. However, the canvas hose made of this extremely thick cotton cloth has a large resistance when it expands into a cylindrical shape, and the amount of steam emitted at the front end is attenuated, so it cannot meet the needs of large-scale gardening facilities. In addition, because it is a cotton material, if it is wet or high in humidity, it is prone to corrosion due to mold, etc., and it is troublesome to dry and store after steam sterilization. The applicant of this case has proposed a "steam spray hose for steam disinfection of soil" (Patent Document 1) to solve the above-mentioned problems. Patent Document 1 discloses a steam blow-out hose for steam disinfection of soil, which is characterized in that a heat-resistant soft synthetic resin sheet with a thickness of about 150 μm is provided on both ends of the hose along the lengthwise direction. A hose body with a thick wall extending over its entire length is formed with discharge holes about 2.5 mm in diameter at predetermined intervals in the length direction of the hose body, and the front end of the hose body is blocked or crushed. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Invention Patent No. 3629231 (Marubun Manufacturing Co., Ltd.)

[The problem to be solved by the invention]

However, the steam ejection hose disclosed in Patent Document 1 still has the following problems. That is, when the steam ejection hose is pulled and laid and stored on the soil surface, the outer layer of the hose will be damaged due to friction with the soil. In particular, the folded edges of the hose folded into a flat shape are easily damaged. When steam passes through the hose, the hose will expand, and it is easy for the steam to leak from the folded edges. Therefore, the object of the present invention is to provide a new soil steam ejection hose that solves the above-mentioned problems. Even when high-temperature steam passes through the hose, the steam ejection hose does not cause steam leakage. [Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is configured as follows. (1) The steam ejection hose of the present invention is a flat steam ejection hose made of a resin cylindrical hose composed of an inner layer, an outer layer and an intermediate layer, and is characterized by: At both ends in the width direction, the folded edges formed by the upper and lower sheets are arranged in the length direction. (2) In the steam ejection hose of the present invention, in the above (1), the inner layer is made of polypropylene, and the outer layer is made of nylon. (3) In the steam ejection hose of the present invention, in the above (1) or (2), the hemmed portion is formed by flattening the cylindrical hose, and the widthwise end portions are closely attached to each other. And formed. (4) In the steam ejection hose of the present invention, in the above (1) to (3), the thickness T1 of the hemmed portion is formed to be thinner than the thickness T2 other than the hemmed portion.

[Effects of Invention] The steam ejection hose of the present invention is formed by flattening the resin cylindrical hose composed of the inner layer, the outer layer and the middle layer, and the upper and lower sheets are tightly attached to the two ends in the width direction. The flanges are arranged all over the length of the steam ejection hose. Therefore, even when the steam ejection hose is dragged and placed on the soil surface and rubbed against the soil, it is difficult to damage the outer layer of the hose, even when the steam passes through. The hose swells, and it is difficult for steam to leak from the flange.

Hereinafter, an embodiment of the steam ejection hose of the present invention will be described based on the drawings. Fig. 1 is a cross-sectional view showing the structure of the steam ejection hose, (a) shows the length direction, and (b) shows a part of the width direction (the part on the left in the drawing). Fig. 2 is a plan view showing the longitudinal direction of the steam ejection hose according to the embodiment.

＜Layer composition of steam blow-out hose＞ As shown in the longitudinal cross-sectional view of Fig. 1(a), the steam ejection hose 10 is composed of three layers of an inner layer 11, an outer layer 13, and an intermediate layer 12 to which they are adhered. In the three-layer structure, the inner layer 11 is composed of heat-resistant synthetic resin, the outer layer 13 is composed of synthetic resin with soil decontamination and durability, and the middle layer 12 is composed of the inner layer 11 and the outer layer 13. The adhesive is composed of synthetic resin. The resin of the inner layer 11 may be, for example, polypropylene, the resin of the outer layer 13 may be, for example, nylon, and the resin of the intermediate layer 12 may be, for example, adhesive polyolefin. Since the polypropylene used for the inner layer 11 has excellent heat resistance, it has durability against high-temperature steam circulating in the steam ejection hose 10. Since the nylon used for the outer layer 13 has excellent chemical resistance, it is easy to remove dirt such as oil and mold attached to the outside of the steam ejection hose 10. In addition, since nylon is excellent in abrasion resistance, it is excellent in resistance to damage during laying and storage when dragged on the ground.

＜Thickness distribution＞ Although the thickness of the steam ejection hose can be appropriately determined according to the conditions of use, in the embodiment, the thickness distribution of each layer of the steam ejection hose is set to be directly exposed to the high-heat steam of the inner layer of 60% and the outer layer of 25%. , 15% of the middle layer. However, this thickness distribution can be appropriately changed according to the usage pattern. In addition, although the basic structure of the steam ejection hose 10 of the embodiment is three-layered, as long as it is a combination of an inner layer resin with good heat resistance and an outer layer resin with good decontamination properties, and any layer contains adhesive components , You can also omit the intermediate layer as the adhesive layer.

＜The folded edge of the steam ejection hose＞ As shown in the cross-sectional view in the width direction of Fig. 1(b) and the plan view of Fig. 2, the long cylindrical steam ejection hose 10 is folded into a flat state, and tightly formed at both ends in the width direction throughout the length direction. Paste the integrated folding part 15. The flange portion 15 promotes the flat shape of the steam ejection hose 10, and facilitates the coiling performance of the hose when it is stored. That is, the reason for forming the flange 15 at both ends of the hose is that when the steam ejection hose 10 is stored, it is difficult to wind up in the original cylindrical shape, and the flange 15 is formed flat. It is folded into a flat shape on the basis of the hemming portions 15 formed at the two ends, thereby making it easy to wind up. However, on the other hand, the laying and storage of the steam ejection hose 10 are carried out while being dragged on the ground surface. Therefore, the folded part 15 is easily damaged and may cause steam leakage. Therefore, in order to increase the folded part With a strength of 15, the upper and lower sheets are tightly attached and integrated. In addition, for the convenience of description, the flat hose is shown as the upper sheet 10a and the lower sheet 10b (refer to the cross-sectional view of FIG. 1(b)). The hemming portion 15 is not formed by laminating the upper and lower sheets 10a, 10b, but is formed by closely adhering both ends of the originally integrated cylindrical hose. Therefore, even if the steam is introduced into the soft In the tube and applying internal pressure, it will expand without peeling.

＜Thin-walled folding part＞ As shown in FIG. 1(b), since the hemming part 15 is closely attached to the upper and lower sheets 10a, 10b, the thickness T1 of the hemming part 15 is thinner than the thickness T2 of the hemming part 15 other than the hemming part 15. The hemming portion 15 closely adheres to the upper and lower sheets 10a, 10b and does not include a space. However, since the outside of the hemming portion 15 is a portion where steam is introduced, a cylindrical space 10c remains. In addition, the reason why the hem portion 15 is thin-walled is because it facilitates the coilability of the hose during the laying and storage of the steam ejection hose 10. Such close contact integration of only the hem portion 15 can be formed by calendering only both ends after the hose is flattened. The details are described in the description column of the manufacturing method described later.

＜Width of the folded edge＞ Although the hemming portion 15 is formed in a band shape with a width W along the longitudinal direction, the width is not specifically defined, and can be appropriately determined according to the pressure of the introduced steam and the like.

＜Manufacturing method of steam blowing hose＞ Fig. 3 is a schematic diagram showing the method of manufacturing the three-layer steam blow-out hose of the embodiment. This steam ejection hose is manufactured by, for example, a resin molding method using an inflation method. As shown in the manufacturing method shown in Figure 3, a co-extrusion die 20 with a ring-shaped end edge called a ring die or a cross-head die is set at the front end of the extruders A, B, and C, and the resin is extruded to continuously shape Cylindrical hose 21. In this case, a co-extrusion die 20 capable of discharging the three-layer resin of the inner layer, the middle layer, and the outer layer of the cylindrical tube 21 is prepared. A hole is provided in the center of the co-extrusion die 20, and air or water is blown from here to expand the hose by 2 to 3 times to form a cylindrical hose 21, and it is stretched by a pinch roller 22. While making the cylindrical hose 21 into a flat shape, only the two ends of the flat hose 23 are pressed tightly with the roller 24 to form the flange 15 to make the flat hose 23, and then temporarily wound around reel. The diameter of the cylindrical hose 21 can be adjusted by adjusting the ring diameter of the coextrusion die 20 or the pressure of the air fed. In addition, the thickness of the cylindrical hose 21 can be adjusted by adjusting the ejection amount of the resin in the extruders A, B, and C and the drawing speed of the pinch roller 22. Although the extrusion direction of the resin is upward and downward, in the case of extruding polypropylene resin, a co-extrusion die 20 is set on the upper part of the equipment to extrude downward. This system can simplify the equipment and make the operation easier, and can use a smaller co-extrusion die 20 to manufacture a cylindrical hose 21 with a larger diameter.

＜Formation of ejection hole＞ In the steam ejection hose 10 of the embodiment, a plurality of ejection holes 16 for ejecting steam from the hose to the outside are formed along the longitudinal direction. In this embodiment, each ejection hole 16 is formed in a pair in the upper and lower sheets 10a, 10b. After these ejection holes 16 are rolled back the flat hose 23 temporarily wound on the reel, the upper and lower sheets 10a, 10b are clamped by the upper and lower rollers, and the punching machine is used to remove It is formed by piercing and drilling from the top to the bottom, and drilling. In addition, the diameter, shape, pitch, number, formation position, etc. of each ejection hole 16 can be appropriately determined by judging the capacity of the boiler and the type of soil, and inputting the data into the punching control device in advance.

＜Use example＞ Fig. 4 is an example of the use of the steam ejection hose of this embodiment. As shown in the perspective view of Figure 4 (a) and the cross-sectional view of (b), a steam jet hose 10 is laid on the surface 30a of the soil (for example, a field) 30 to be disinfected, and its base 10d is connected to a boiler installed outside 31. The front end 10e is blocked. After that, the soil 30 and the steam ejection hose 10 are covered by a cover plate 32 made of non-air-permeable polyethylene or the like, and a weight 33 is placed on the upper surface of the cover plate 32 to form a disinfection area 34.

In addition, as shown in the conceptual diagram of FIG. 5, when the steam generated in the boiler 31 is introduced from the base 10d of the steam ejection hose 10, the steam ejection hose 10 expands, and high-temperature steam is ejected to the outside through the ejection hole 16, and is filled. Between the cover plate 32 and the soil 30, a heat front is formed over the entire soil surface 30a. With the continuous supply of steam, the heat front propagates downward from the soil surface 30a, and the entire soil 30 is surely disinfected by uniform temperature distribution. [Industrial availability]

The steam ejection hose of the present invention can be widely used in the prevention of soil infectious diseases and insect pests caused by the annual cultivation of melons, etc., gardening, agriculture, etc. Furthermore, the present invention is non-toxic and harmless to humans, animals, and neighboring crops, and has high industrial applicability.

10: Steam ejection hose 10a: Upper sheet 10b: Lower sheet 10c: Cylindrical space 10d: Vapor ejected from the base of the hose 10e: The front end of the steam jet hose 11: inner layer 12: Middle layer 13: Outer layer 15: Folding part 16: spout hole 20: Co-extrusion die 21: Cylindrical hose 22: Pinch roller 23: Flat hose 24: Roll 30: soil (field) 30a: soil surface 31: Boiler 32: cover 33: Heavy 34: Disinfection area A, B, C: extruder T1: The thickness of the folded edge 15 T2: The thickness of the hem section other than 15

[Fig. 1] is a cross-sectional view showing the structure of the steam ejection hose of the present invention, (a) shows the length direction, and (b) shows a part of the width direction. [Fig. 2] A plan view showing the length direction of the steam ejection hose according to the embodiment. [Fig. 3] is a schematic diagram showing the method of manufacturing the three-layer steam ejection hose of the embodiment. [Fig. 4] shows an example of use of the steam ejection hose of the embodiment, (a) is a perspective view, and (b) is an X-X cross-sectional view of (a). [Fig. 5] is a conceptual diagram showing how the steam ejected from the steam ejection hose 6 spreads to the soil.

10: Steam ejection hose

10a: Upper sheet

10b: Lower sheet

10c: Cylindrical space

11: inner layer

12: Middle layer

13: Outer layer

15: Folding part

T1: The thickness of the folded edge 15

T2: The thickness of the hem section other than 15

Claims (4)

A steam ejection hose is a flat steam ejection hose made of a resin cylindrical hose composed of an inner layer, an outer layer and an intermediate layer, and is characterized by: At both ends in the width direction, the folded edges formed by the upper and lower sheets are arranged in the length direction. Such as the steam ejection hose of claim 1, in which, The inner layer is made of polypropylene, The outer layer is made of nylon. Such as the steam ejection hose of claim 1 or 2, in which, The hemmed portion is formed by flattening the cylindrical hose, and closely adhering both ends in the width direction. Such as the steam ejection hose of any one of claims 1 to 3, wherein: The thickness T1 of the hemming part is formed to be thinner than the thickness T2 other than the hemming part.

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