JPH0596691A - Pressure resisting hose - Google Patents

Abstract

PURPOSE:To provide a pressure resisting hose light in weight and improved in pressure resistance for use in feeding and discharging water in engineering works by producing the hose blank having a reinforcing synthetic resin fabric interposed between the base materials consisting of a straight-chain, low-density polyethylene having a predetermined melt flow rate, density and melting point and a high-pressure molded polyethylene. CONSTITUTION:The hose blank 2 is of a three layer structure consisting of two base plates 2a and a reinforcing base material 2b made of vinylon fabric interposed therebetween and the hose blanks 2 are heat sealed at heat seal parts 1a to form a pressure resisting hose 1, which remains flat when water is not being conveyed therethrough and during the water conveying period is expanded. The base plate 2a is produced from a mixture of the alpha-olefin having 4-8 carbon atoms, e.g. a straight-chain, low-density polyethylene obtained by copolymerizing 1-hexane and ethylene and having a melt flow rate of 1-6g/min, a density of 0.910-0.940g/cm<3> and a melting point of 110-130 deg.C, and a high-pressure molded polyethylene made up in such proportions that the mixture comprises 50-100wt.% of the straight-chain, low-density polyethylene and 50-0wt.% of the high-pressure molded polyethylene.

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 / water supply work in the field of civil engineering / construction, water guiding for irrigation in the field of agriculture, and water supply.

[0002]

2. Description of the Related Art Conventionally, various pressure hoses are known, but there is a demand for a durable pressure hose that is compact when stored, is lightweight, and has excellent pressure resistance. Was there.

[0003]

Means for Solving the Problems The present inventors
As a result of examination to solve the problem,
Also, it has 2 continuous heat seal parts at symmetrical positions.
However, it expands when passing water and has a cylindrical shape, but when not passing water
In a flat pressure-resistant hose, the material of the pressure-resistant hose is
Main base material is α-olefin having 4 to 8 carbon atoms and ethylene
A copolymer having a melt flow rate of 1 to
6 g / min, density 0.910 to 0.940 g / cm ³, Melting point 1
Linear low density polyethylene at 10 to 130 ° C 50 to
100 parts by weight and high pressure polyethylene 50 to 0 parts by weight
Polyethylene consisting of and synthetic as a reinforcing base material
A layer structure in which a resin woven fabric is interposed between the main base material and the layers of the main base material.
The pressure resistant hose with a structure is compact when stored,
Found to be lightweight and durable with excellent pressure resistance
The present invention was completed.

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 α-olefin having 4 to 8 carbon atoms and ethylene,
Alternatively, a mixture of high-pressure polyethylene is used, and the mixing ratio thereof is 50:50 to 100: O by weight, preferably 70:30 to 100: O. Among them, α-olefin having 6 carbon atoms is used. The linear low-density polyethylene obtained by copolymerizing 1-hexene (for example, Sumikasen α manufactured by Sumitomo Chemical Co., Ltd.), or a mixture thereof with high-pressure polyethylene is preferable.

As a reinforcing base material to be interposed between the main base materials, woven cloth made of synthetic resin such as polyolefin, vinylon or polyester is used, and particularly, the fusion bonding property with polyethylene of the main base material is good and A polyethylene flat yarn excellent in physical strength is preferable. Moreover, in that case, since the main base material and the reinforcing base material are made of the same polyethylene, it is also preferable from the viewpoint of easily reusing resources, which is often said in recent years.

The pressure-resistant hose according to the present invention is used for drainage / water supply work in the field of civil engineering / construction, for guiding water for irrigation to facility gardening houses in the field of agriculture, and for water supply for sprinkler irrigation and perforated pipe irrigation in upland fields. In addition, it can be used for a wide range of purposes such as water supply for a furrow irrigation system in which water is poured directly into the furrows of a field. The pressure-resistant hose of the present invention can also be used as a watering tube by providing a large number of watering holes arranged at appropriate intervals in the longitudinal direction.

The pressure-resistant hose of the present invention is made of a lightweight material. Especially, the thickness of the material forming the pressure-resistant hose is 0.5 to 1.0 mm, and the weight per m ^{2 is} within the range of 450 to 950 g. However, it is practical in terms of lightness and compactness. The thickness of the raw material of the heat-sealed surface is preferably 0.2 mm or more from the viewpoint of pressure resistance, and more preferably 0.3 mm or more.

[0008]

The pressure-resistant hose of the present invention has a continuous heat-sealed portion, has a cylindrical shape that expands when water is passed through, and is flat when not passing water, so that it can be wound compactly.
Easy to lay, store and store. Moreover, since the synthetic resin woven fabric as the reinforcing base material is interposed between the main base material and the layers of the main base material, the compressive strength is increased.

[0009]

Embodiments 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 passing water and is shown in FIG. The pressure hose has a cylindrical shape as shown in FIG. 2 but is flat 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 a main base material 2a.

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 caused by spring water or rainfall at a civil engineering / construction site, the pressure-resistant hose 1 of the present invention is connected to a discharge side of the pump through a joint, and the drainage path 5 is discharged. The following is an example.

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 for facilities, the pressure resistance of the present invention is applied from a water source 9 such as an irrigation canal or a pond via a land pump 6. The hose 1 guides you to the greenhouse for greenhouses, and the existing irrigation system (filter, liquid fertilizer mixing device,
Examples include water supply to branch pipes in the house, watering tubes, etc.).

Further, as shown in FIG. 6, the pressure-resistant hose of the present invention in which minute water spray holes are formed on one surface is a high-pressure perforated pipe water hose 10 capable of irrigating a large area of field crop 11 at once. is there.

Next, a production example of the pressure resistant hose of the present invention, a pressure resistance strength when the pressure resistance hose is used, and a peel strength of heat seal will be shown. Linear low-density polyethylene copolymerized with 1-hexene as the main raw material (Sumitake Chemical Industries Ltd. Sumikasen α, melt flow rate 2.0 g / min, density 0.912 g / cm ³ , melting point 117 ° C) Woven fabric of stretched polyethylene flat yarn as a reinforcing base material
Use 12 × 12 / inch, 79g / m ² in weight and 0.75mm thickness of the original fabric. There are two continuous locations at symmetrical positions extending along the longitudinal direction as shown in FIG. A pressure-resistant hose having a diameter of 50 mm and a heat-sealed portion (the hose of Example 1) was manufactured.

Further, linear low-density polyethylene copolymerized with 1-hexene and high-pressure process polyethylene (melt flow rate 2 g / min, density 0.924 g / c as main base material of raw material)
A pressure-resistant hose (hose of Example 2) was produced in the same manner as in Example 1 above, using a 8: 2 weight ratio mixture with m ³ ).

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

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

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

A pressure-resistant hose having a length of 3 m is plugged at the end, and a pressure gauge for measuring pressure-resistant strength is attached to the other end of the pressure-resistant hose. The pressure when the hose broke was measured.
Further, the peel strength of the heat seal was determined by the actual load at the time when the heat seal portion was peeled off, with a test piece obtained by cutting the heat seal portion of the pressure resistant hose into a width of 1 cm with an autograph at a pulling speed of 200 mm / min. The results are shown in Table 1. In addition, as a comparative example, a hose similar to that of Example 1 is prepared except that a reinforcing base material is not interposed, and pressure resistance and peel strength are determined.

[0020]

[Table 1]

Next, when the weight and winding diameter at 100 m of the hose of Example 1 were examined, the hose was lightweight and compact as follows. 100m weight: 12.5kg 100m roll diameter: 45cmφ

[0022]

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

[Brief description of drawings]

FIG. 1 shows a pressure-resistant hose 1 when passing water. 1a represents the heat seal part.

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

FIG. 3 shows a three-layer structure of the original fabric 2. The structure is such that the reinforcing base material 2b is interposed between the main base material 2a.

[Fig. 4] The submersible pump 3 is installed in the water reservoir 4, and the pressure hose 1
The following shows how to lead to the drainage channel 5.

FIG. 5 shows how water is supplied from a water source 9 to a facility gardening house 8 through a filter 7 via a land-based pump 6.

FIG. 6 shows irrigation of a field crop 11 using a watering hose 10 having micro watering holes formed on one surface.

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Claims (5)

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