JP3024313B2 - Pressure hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-resistant hose used for drainage and water supply work in the civil engineering and construction fields, irrigation water supply and water supply in the agricultural field, and the like.

[0002]

2. Description of the Related Art Various pressure-resistant hoses have hitherto been known. However, there is a demand for a compact pressure-resistant hose which is compact when stored and which is lightweight and has excellent pressure resistance. I was

[0003]

The present inventors have SUMMARY OF THE INVENTION As a result of studies to solve the above problems, has extending along the longitudinal direction, the heat-sealed portion consecutive in two places at symmetrical positions, In a pressure-resistant hose that expands when passing water and has a cylindrical shape but becomes flat when not passing water, the raw material of the pressure-resistant hose is
The main substrate is a copolymer of α-olefin having 4 to 8 carbon atoms and ethylene, having a melt flow rate of 1 to 6 g / min, a density of 0.910 to 0.940 g / cm ³ , and a melting point of 110 to 130 ° C. Linear low density polyethylene of 50 to 10
Polyethylene comprising 0 parts by weight and 50 to 0 parts by weight of a high-pressure polyethylene, and has a layer structure in which a synthetic resin woven fabric as a reinforcing base is interposed between the main base and the main base. The present inventors have found that the hose is compact when stored, is lightweight, and is durable with excellent pressure resistance, and completed the present invention.

In the pressure-resistant hose of the present invention, the main base material is linear low-density polyethylene alone, which is a copolymer of the above-mentioned C4 to C8 α-olefin and ethylene;
Alternatively, a mixture obtained by mixing high-pressure polyethylene is used, and the mixing ratio is 50:50 to 100: O, preferably 70:30 to 100: O by weight, and among them, α-olefins having 6 carbon atoms Is preferable, for example, a linear low-density polyethylene copolymerized with 1-hexene (for example, Sumikasen α manufactured by Sumitomo Chemical Co., Ltd.) or a mixture thereof with a high-pressure polyethylene.

As a reinforcing base material interposed between the main base materials, a woven fabric made of a synthetic resin such as polyolefin, vinylon or polyester is used. A polyethylene flat yarn having excellent physical strength is preferred. Moreover, in this case, since the main base material and the reinforcing base material are made of the same polyethylene, it is preferable from the viewpoint that it is easy to reuse resources, which is often used in recent years.

The pressure-resistant hose of the present invention is used for drainage and water supply work in the civil engineering and construction fields, water supply for irrigation to greenhouses in the agricultural field, water supply, and water supply for sprinkler watering and perforated pipe watering in upland fields. It can be used for a wide range of purposes, such as for furrow irrigation, in which water is directly poured between furrows in a field. In addition, the pressure-resistant hose of the present invention can be used as a watering tube by providing a large number of irrigation holes arranged at appropriate intervals in the longitudinal direction.

[0007] The pressure hose of the present invention is used a lightweight material, is particularly from 0.5 to raw thickness to form the pressure hose 1.0 mm, to 450 without the weight per 1 m ² in the range of 950 g However, it is practical in terms of lightness and compactness. Further, it is preferable that the thickness of the raw material of the heat sealing surface is 0.2 mm or more from the viewpoint of the pressure resistance, and it is particularly preferable that the thickness is 0.3 mm or more.

[0008]

The pressure-resistant hose of the present invention has a continuous heat seal portion, expands when flowing water, and has a cylindrical shape.
Easy to lay, store and store. In addition, because of the layer structure in which the synthetic resin woven fabric as the reinforcing base material is interposed between the main base material and the main base material layer, the pressure resistance is increased.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The pressure-resistant hose 1 shown in FIGS. 1 and 2 has two continuous heat-sealing portions 1a at symmetrical positions extending along the longitudinal direction, and expands when flowing water, as shown in FIG. This is a pressure-resistant hose having a cylindrical shape as shown in FIG.

As shown in FIG. 3, the raw fabric 2 has a three-layer structure in which a reinforcing base material 2b is interposed between main base materials 2a.

FIGS. 4 to 6 show examples of use of the pressure-resistant hose of the present invention. FIG. 4 shows that a submersible pump 3 is installed in a water reservoir 4 due to spring water or rainfall at a civil engineering / construction site, and a pressure-resistant hose 1 of the present invention is connected to a discharge side of the pump via a joint, and is guided to a drain channel 5 for discharge. This is an example of the operation.

As an example of use in the agricultural field, as shown in FIG. 5, for example, when it is desired to irrigate crops in a greenhouse 8, a water source 9 such as an irrigation canal, a pond, etc. Guide to the horticulture house with the hose 1 and use the existing irrigation system (filter, liquid fertilizer mixer,
Water is supplied to a branch pipe in a house, an irrigation tube, and the like.

Further, as shown in FIG. 6, the pressure-resistant hose of the present invention having a fine water-spray hole formed on one side is capable of watering a field crop 11 having a large area at a time as a high pressure-resistant water sprinkling hose 10. is there.

Next, a production example of the pressure-resistant hose of the present invention, pressure resistance when the pressure-resistant hose is used, and peel strength of the heat seal will be described. Linear low-density polyethylene copolymerized with 1-hexene as the main base material of the raw material (Sumikacene α manufactured by Sumitomo Chemical Co., Ltd., melt flow rate 2.0 g / min, density 0.912 g / cm ³ , melting point 117 ° C.) With a woven fabric of stretched polyethylene flat yarn as a reinforcing base material
12 pcs x 12 pcs / inch, weight of 79 g / m ² , with a thickness of the raw material of 0.75 mm and two continuous symmetrical positions extending along the longitudinal direction as shown in Fig. 1 A pressure-resistant hose (hose of Example 1) having a heat-sealed portion and a hose diameter of 50 mmφ was manufactured.

[0015] Further, a linear low-density polyethylene obtained by copolymerizing 1-hexene and a high-pressure polyethylene (melt flow rate 2 g / min, density 0.924 g / c
A pressure-resistant hose (the hose of Example 2) was produced in the same manner as in Example 1 above, using an 8: 2 mixture by weight with m ³ ).

Further, a linear low-density polyethylene copolymerized with 1-hexene and a high-pressure polyethylene (melt flow rate 2 g / min, density 0.924 g / cm
^A pressure-resistant hose (the hose of Example 3) was produced in the same manner as in Example 1 above, using a 7: 3 mixture by weight with ³ ).

Next, as a reinforcing base material, a vinylon woven fabric having a drawing number of 15 × 15 / inch and a weight of 81 g / m ² was used. A hose (the hose of Example 4) was manufactured.

Next, the thickness of the base material on the heat sealing surface of the raw material is
A pressure-resistant hose (the hose of Example 5) was manufactured in the same manner as in Example 1 except that the diameter was set to 0.2 mm.

A 3 m long pressure hose is plugged at the end, and a pressure gauge for measuring the pressure strength is attached to the other end. The pressure gauge is connected to a power atomizer and pressurized water is supplied to the pressure hose while gradually pressurizing. The pressure when the hose was broken was measured.
The peel strength of the heat seal was determined from an actual load at the time when the heat seal was peeled at a pulling speed of 200 mm / min using an autograph of a test piece obtained by cutting the heat seal part of the pressure-resistant hose into a 1 cm width. Table 1 shows the results. As a comparative example, a hose similar to that of Example 1 was prepared except that no reinforcing base material was interposed, and the results of the pressure resistance and the peel strength were also described.

[0020]

[Table 1]

Next, the hose of Example 1 was examined for its weight and winding diameter at 100 m, and it was found to be light and compact as follows. 100m weight: 12.5kg 100m winding diameter: 45cmφ

[0022]

The pressure-resistant hose of the present invention is compact when stored, lightweight, durable with excellent pressure resistance, and can be widely used in the fields of civil engineering, construction, and agriculture.

[Brief description of the drawings]

FIG. 1 shows a pressure-resistant hose 1 when flowing water. 1a represents the heat seal portion.

FIG. 2 shows the pressure-resistant hose 1 when water is not passed.

FIG. 3 shows a three-layer structure of a web 2; It has a structure in which a reinforcing base material 2b is interposed between the main base materials 2a.

FIG. 4 shows a submersible pump 3 installed in a water reservoir 4 and a pressure-resistant hose 1
Shows the state of being guided to the drainage channel 5 by means of.

FIG. 5 shows a state in which water is supplied from a water source 9 to a greenhouse 8 through a filter 7 via a pump 6 on land.

FIG. 6 shows watering of a field crop 11 using a watering hose 10 having a fine watering hole formed on one side.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-87989 (JP, A) JP-A-1-87990 (JP, A) JP-A-1-203787 (JP, A) JP-A-63-879 51135 (JP, A) Actual opening 57-164548 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 F16L 9/00-9/22 F16L 11/00-11/24

Claims (5)

(57) [Claims] 1. A pressure resistance which has two continuous heat seal portions at symmetrical positions extending in the longitudinal direction and which expands when flowing water and has a cylindrical shape but becomes flat when not flowing water. In the hose, the raw material of the pressure-resistant hose is that a main base material is a copolymer of an α-olefin having 4 to 8 carbon atoms and ethylene, a melt flow rate is 1 to 6 g / min, and a density is 0.
910 to 0.940 g / cm ^3, melting point of the polyethylene consisting of a linear low density polyethylene 50 to 100 parts by weight of high-pressure polyethylene 50 to 0 parts by weight of from 110 130 ° C., a synthetic resin as a reinforcing substrate A pressure-resistant hose having a layer structure in which a woven fabric is interposed between layers of a main substrate and the main substrate. 2. A base material comprising a copolymer of an α-olefin having 4 to 8 carbon atoms and ethylene, having a melt flow rate of 1 to 6 g / min and a density of 0.910 to 0.940 g / cm.
^3. The pressure-resistant hose according to claim 1, which is a linear low-density polyethylene having a melting point of 110 to 130 ° C. 3. The woven fabric made of synthetic resin is polyolefin, vinylon or polyester.
The described pressure hose 4. The pressure-resistant hose according to claim 3, wherein the synthetic resin woven fabric is a flat yarn made of polyethylene. 5. A watering tube according to claim 1, wherein the watering tube has a plurality of irrigation holes arranged at appropriate intervals in the longitudinal direction.