JPH0130036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible hose that is frequently subjected to repeated reeling and expansion due to water supply pressure.

Conventionally, flexible hoses are shown in Figures 1a and b.
As shown in Fig. 2, a tubular fiber base material in which a weft thread 2 and/or a horizontally wound diagonal thread 3 are wound and bonded around the outer periphery of a warp thread 1 is embedded in a polymer material 4 as shown in Fig. 2 to form a tubular fiber base material. The hose is wound spirally around a reel for storage and transportation, and when used, it is stretched from the reel and expanded from its flat shape by water supply pressure. Generally, when a cylindrical hose is stored or transported, both ends of the hose when bent into a flat shape are the ear portions A, and the other portions other than the ear portions are the bottom portion B (see Figure 3). However, since the ears of this hose are frequently bent and expanded, the inner skin of the polymer material at the ears is more severely damaged than the inner skin of the base, and water often leaks. became the cause of In particular, in recent years, water supply pressure has become higher and 5
It is commonly used at ~10Kg/cm ² , and along with the expansion in the circumferential direction when the hose is expanded, the ear part is repeatedly stretched nearly 180 degrees from the bent state, and the inner skin of the polymer material becomes increasingly harsh. exposed. For this reason, if an attempt was made to increase the thickness of the polymer material in the inner skin and strengthen it, the ear part of the hose, which is wound on a spiral reel and handled with as small a volume as possible when not in use, would be bent almost flat. Therefore, the outer periphery from the weft and/or diagonal threads constituting the tubular fiber base material in the center of the hose to the outer skin surface is stretched.
The inner periphery from the warp to the inner surface of the inner skin is compressed, and especially when a polymer material with relatively low elongation is used, the unevenness of the inner wrinkles is large, and in severe cases, the concave part cracks and the warp is exposed. Water seeping into the warp threads was transmitted to the weft threads, causing water to leak from weak spots on the surface, gradually turning into a large fountain that could no longer be used as a hose.

As a result of various studies on the causes of this, we found that the warp threads are arranged at equal intervals as shown in Figure 2, and the required number of threads are twisted so that each warp thread has a nearly circular cross section to support strength and pressure in the longitudinal direction. Since the hose is bonded and integrated with the inner skin of the polymer material, its natural shape maintains a nearly circular cross section, but as shown in Figure 3, the hose is folded into a flat shape and wound onto a reel for storage. The selvage part is bent, and the warp threads are rolled in a direction centripetal to the selvage arc due to the compression of the inner periphery, deformed into an elliptical shape, and moved inward together with the inner skin. At this time, the inner skin is Since the diagonal threads can move to the outer periphery through the gaps between the threads, the polymer material on the innermost end of the warp threads becomes thinner as a whole, and an uneven state on the inner surface is formed along the warp threads, resulting in convexity. It has been found that this is because the recesses are deep and cracks occur due to the protrusion of the warp, and the polymer material at the apex of the warp becomes thin and can no longer be stretched.

This invention has been made based on the above circumstances, and includes reducing the amount of warp yarns, which are relatively rigid compared to polymer materials, in the selvedge part than in the ground part,
By increasing the amount of polymer material by the amount of warp threads that have been reduced, the selvage part can be made flexible and durable, and a product with extremely simple construction and extremely high reliability can be supplied at a low cost. The purpose is to provide a hose that can

This invention will be described with reference to an embodiment shown in the drawings.

FIG. 4 is a cross-sectional view of the essential parts of an embodiment of the hose of the present invention, and FIG. 5 is a cross-sectional view of the ear portion of the same hose when it is bent into a flat shape. In the figure, reference numeral 10 denotes a hose, and the hose 10 has a tubular fiber member 13 formed by winding a weft 12 and/or a diagonal thread (not shown) wound in the left-right direction around the outer periphery of a warp 11. The fiber member 13 is coated with an inner skin 14a and an outer skin 14b by dipping or extrusion into a flexible polymer material 14 made of synthetic rubber, polyvinyl chloride, or the like. At this time, both ends A and A' of the hose 10 are ear portions, and the remaining portion excluding the ear portions is a base portion B.

The ratio of the ear parts A and A' to the base part B varies depending on the diameter and thickness of the hose 10, and can be determined appropriately according to each condition. Since the whole part becomes soft and inconvenient when used, the ear part A,
It is preferable that both A'(A+A') be formed so as to occupy 1/4 or less of the inner circumference of the hose.
The warp threads 11a of the edge portions A and A' have approximately the same thickness as the warp threads 11b of the ground portion, and are arranged more sparsely than the warp threads 11b of the ground portion B.

The degree of roughness of the warp threads 11a of the edge portion A relative to the base portion B varies depending on the diameter and thickness of the hose, how the hose is used, and where it is used, but is approximately 10 to 50%.
It is applicable if it falls within this range, but it is more preferable if it falls within the range of 20 to 30%.

Note that this hose 10 has ear portions A,
A folding pattern is formed so that A' is pressed and always bent at the ear. In addition, although the tubular fiber member 13 in the figure is shown as having one layer each of warp 11, weft 12, and diagonal yarn, it is not limited to this, and may be formed by winding it into multiple layers depending on the water supply pressure. Needless to say, you can do it this way.

In the hose 10 configured as described above,
The amount of polymer material in the inner skin 14a' of the ear portion A is:
It is contained in a large amount compared to the amount of polymer material in the inner skin 14a'' of the base portion.

That is, when comparing the area occupied by the warp yarns 11 per unit cross-sectional area of the inner skin 14a' of the ear part A and the inner skin 14a'' of the ground part B, the unit cross-sectional area is relatively smaller than that of the polymer 14. However, when the weft 12 and/or the diagonal are constant, the density of the warp 11a in the selvedge part is the same as that in the ground part, as described above. Since the warp yarns 11b are arranged more coarsely than the warp yarns 11b, the polymer material layer occupies a larger area in the inner skin 14a' of the edge portion A than the inner skin 14a'' of the base portion B by the decrease in the warp yarns 11a. It will be occupied. This is because the amount of polymer material per unit cross-sectional area in the inner skin 14a' of the ear portion A is greater than that in the inner skin 14a'' of the bottom portion B.

As described above, since the hose of the present invention contains a large amount of polymer material in the ear portion, it is possible to impart inner flexibility when bending, and the warp threads 11a
This means that the amount of polymer material covered is increased. Therefore, this hose 10 is stored and transported by being wound around a reel in a spiral shape, and when used, it is stretched from the reel and expanded from a flat state to an expanded state by the water supply pressure, and is bent into a bent state and an expanded circular arc. Even if the state is repeated frequently, for example in the bent state shown in FIG.
There is no outward movement of a', and therefore no damage to the ear portions or water leakage due to this occurs, making it possible to provide a highly durable hose.

FIG. 6 is a sectional view of a main part showing another embodiment of the hose of the present invention, in which the warp threads 11a' of the ear portion A are formed to be thinner than the warp threads 11b of the ground portion B, and their density is the same. It differs from the previous embodiment in that it is roughly formed, and the other parts are almost the same as the previous embodiment and have the same functions, so a detailed explanation thereof will be omitted.

FIG. 7 is a cross-sectional view of the main part showing another embodiment of the hose of the present invention, in which the warp yarns 11a'' of the ear portion A are of a lightly twisted elliptical shape with a small number of twists; This warp 11a'' is used as the warp 11b of the base part B.
The difference from the above embodiment is that the cells are arranged at the same density or sparse density, and the other parts are almost the same as the above embodiment, and the operation is also the same, so a detailed explanation thereof will be omitted. shall be.

FIG. 8 is a sectional view of a main part showing still another embodiment of the hose of the present invention, in which the warp threads 11a'' of the ear portion A are formed of hollow fibers which are heat insulating fibers, and the hollow fibers are The difference from the above embodiment is that the threads are arranged at the same density or sparse density with respect to the warp threads 11b of the ground portion B, and the other parts are almost the same as the above embodiment, and the operation is also the same. A detailed explanation thereof will be omitted.Although the above embodiment shows one hollow system, the present invention is not limited to this, and multiple hollow systems may be used as necessary. They may also be twisted together.

FIG. 9 is a cross-sectional view of the main part showing still another embodiment of the hose of the present invention, and FIG. 10 is a cross-sectional view of the ear portion showing the same wound state, which shows the polymer material 14 of the ear portion A. It is the inner circumferential surface of the inner skin 14a, and an uneven portion 17 is formed along the longitudinal direction. As the thickness of the inner peripheral portion of the uneven portion 17 increases, the gentler the uneven portion 17, the easier it is to absorb the bending compression of the ear portion A. The above points are different from those of the previous embodiment, and other parts are almost the same as those of the previous embodiment, and the operation is also the same, so a detailed explanation thereof will be omitted.

FIG. 11 is a cross-sectional view showing still another embodiment of the hose of the present invention, in which the warp threads 11a' of the ear portion A are formed of fine threads, and the densities thereof are arranged at the same density or coarse density. In addition, the warp threads 11b of the ground portion B are formed by arranging the main thick threads 11b in a coarse density arrangement and arranging a plurality of supporting thin threads 11b' between the thick threads 11b. The above points are different from those of the previous embodiment, and the other parts are almost the same as those of the previous embodiment, and the operation is also the same, so a detailed explanation thereof will be omitted.

As described above, this invention substantially reduces the amount of warp yarns, which are relatively rigid compared to the polymer material, in the selvedge portion than in the base portion, and conversely increases the amount of the polymer material by the amount of the decreased warp yarns. Since the ears are made flexible, the ears will not be damaged even if the bent state and the expanded arc state are repeated frequently and can withstand long-term use. be able to. Furthermore, the present invention has excellent effects such as being able to supply products with extremely simple construction and extremely high reliability at low cost.

By the way, as a result of comparing a conventional hose used for the same purpose and the hose of this invention in the number of repetitions until cracks appear in the ears in a repeated flattening/expansion test, it was found that the hose of this invention was superior to the conventional hose. It has been revealed that the durability is two to three times longer than that of a hose.

[Brief explanation of drawings]

Figures 1a and b are explanatory diagrams showing the twisted yarn, Figure 2 is a partial sectional view showing an example of a conventional hose, Figure 3 is a sectional view of the ear part showing the same wound state, and Figure 4 is A cross-sectional view of the main part showing one embodiment of the hose of the present invention, FIG. 5 is a cross-sectional view of the ear part showing the same rolled state,
FIG. 6 is a sectional view of the main part showing another embodiment of the hose of the present invention, FIG. 7 is a sectional view of the main part showing still another embodiment of the hose of the invention, and FIG. 8 is a sectional view of the main part showing another embodiment of the hose of the invention. FIG. 9 is a cross-sectional view of the main part showing another embodiment of the hose of the present invention; FIG. 10 is a cross-sectional view of the ear portion showing the same rolled state; FIG. , FIG. 11 is a sectional view showing still another embodiment of the hose of the present invention. 1, 11... warp, 2, 12... weft, 3...
Diagonal thread, 10... hose, 13... tubular fiber member,
14...polymer material, 14a...endothelium, 14b...
Outer skin, A... ear part, B... base part, 17... uneven part.

Claims (1)

[Scope of Claims] 1. A tubular fiber member in which a weft thread and/or a diagonal thread wound in the left-right direction are wound and bonded around the outer periphery of the warp thread is embedded in a polymer material for coating and formed into a cylindrical shape. In a flexible hose, the ear portion of the hose occupies 1/4 or less of the inner circumference of the hose, and the area occupied by the warp per unit cross-sectional area of the hose in the ear portion is:
A hose characterized in that flexibility is imparted to the inner peripheral surface of the ear portion by forming the inner peripheral surface of the ear portion to be substantially smaller than that of the base portion. 2. The hose according to claim 1, wherein the warp of the ear portion is formed of an elliptical yarn with a small number of twists. 3. The hose according to claim 1, wherein the warp of the ear portion is formed of a hollow fiber or a yarn made by twisting a combination of hollow fibers. 4. The hose according to any one of claims 1 to 3, wherein an uneven strip along the longitudinal direction is formed on the inner circumferential surface of the ear portion.