JP2014066314A - Flexible hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube incorporated flexible hose which suppresses that retractility or bending property of the flexible hose is inhibited on a portion where a tube inserted into the hose is adhered.SOLUTION: A tube incorporated flexible hose 1 includes a flexible hose body 2 formed by integrally winding a flexible strip band made of synthetic resin spirally and a flexible tube 3 which is integrally bonded to the inner circumferential surface of the flexible hose body 2 with an adhesive 4. An inner circumferential part (204, 22) arranged on the innermost circumferential part of the hose of the inner circumferential surface of the flexible hose body 2 has two spiral regions S1 and S2 arranged alternately spirally. Surfaces of the two spiral regions S1 and S2 have adhesiveness for the adhesive material 4 different from each other, that is, in one side spiral region S1, the flexible hose body 2 and the flexible tube 3 are bonded to each other and, on the other spiral region S2, the flexible hose body 2 and the flexible tube 3 substantially are not bonded to each other.

Description

The present invention relates to a flexible hose made of a synthetic resin having excellent flexibility, and more particularly to a flexible hose in which a tube is joined and integrated along the length of the hose inside the hose.

2. Description of the Related Art A tube built-in type flexible hose in which a tube is joined and integrated inside a hose is used for, for example, a hose of an electric vacuum cleaner. In a vacuum cleaner, the tube provided inside the hose is used for, for example, a purpose of sending cleaning liquid, reflux air, or the like, or inserting a wiring (lead wire) into the tube.
If the tube is not fixed in the hose, the tube may move around in the hose and be worn or damaged. Therefore, the tube is often joined and integrated to the inner peripheral surface of the hose by an adhesive or the like.

In the portion where the tube is bonded and integrated with the inner peripheral surface of the hose, the elasticity and flexibility of the hose are likely to be impaired due to the influence of the tube and the adhesive. Therefore, it is expected that the tube is joined and integrated with the hose so as not to impair the flexibility of the hose as much as possible.

Patent Document 1 discloses a flexible hose with a built-in tube in which a flexible tube is bonded and integrated into a loose flexible hose. A tube-mounted flexible hose is disclosed in which concave grooves and ridges are formed when viewed from the inside, and the tube is bonded and integrated to the inner peripheral wall of the hose in the ridges. According to the characteristic hose, it is disclosed that the stretchability and bendability of the flexible hose can be prevented from being inhibited at the site where the tube is bonded.

JP 2009-024750 A

The inventor tried to improve the flexibility of the tube-containing flexible hose by another technique different from the technique disclosed in Patent Document 1. That is, an object of the present invention is to suppress the obstruction of the stretchability and bendability of the flexible hose at the site where the tube inserted into the hose is bonded in the flexible hose with a built-in tube.

As a result of intensive studies, the inventor provided two spiral regions alternately arranged in a spiral on the inner peripheral surface of the hose to which the tube can be joined by an adhesive, and between the surfaces of the two spiral regions. The tube and the hose can be joined intermittently by making the adhesiveness to the adhesive material different so that they are joined in one region and not substantially joined in the other region. As a result, the present invention has been completed.

The present invention relates to a flexible hose body having a hose wall formed by integrally winding a flexible strip made of synthetic resin in a spiral shape, and a hose length on an inner peripheral surface of the flexible hose body. A flexible hose having a flexible tube bonded and integrated along the direction by an adhesive, and is disposed on the innermost peripheral portion of the hose of the inner peripheral surface of the flexible hose body. The inner peripheral portion has two spiral regions alternately arranged in a spiral shape, and the surfaces of the two spiral regions are different from each other in adhesion to the adhesive, and one spiral In the spiral region, the inner peripheral portion of the flexible hose body and the flexible tube are joined to each other, and in the other spiral region, the inner peripheral portion of the flexible hose body and the flexible tube are substantially joined. It is a flexible hose which is not (first invention).

In the present invention, the adhesive is a thermoplastic adhesive, and the melting point of the synthetic resin that forms a spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are joined to each other is the flexible hose body. It is preferable to lower the melting point of the synthetic resin that forms a spiral region where the inner peripheral portion and the flexible tube are not substantially joined to each other (second invention). In the present invention, the adhesive is a thermoplastic adhesive, and the synthetic resin forming the spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are joined to each other is the thermoplastic adhesive. Synthetic resin, which is a compatible thermoplastic resin and forms a spiral region in which the inner peripheral portion of the flexible hose body and the flexible tube are not substantially joined to each other, is incompatible with the thermoplastic adhesive. A resin is preferable (third invention).

In the present invention, it is preferable that the spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are joined to each other is subjected to a surface treatment for improving the adhesiveness with the adhesive (first). 4 invention). In the present invention, the spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are not substantially joined to each other is subjected to a surface treatment that makes the spiral region non-adhesive to the adhesive. It is preferable that it is (5th invention).

According to the flexible hose of the present invention (first invention), in the tube-mounted flexible hose, the stretchability and bendability of the flexible hose are hindered at the site where the tube inserted into the hose is bonded. This can be suppressed.

Furthermore, if the configurations of the second invention to the fifth invention are adopted, an effect that the flexible hose with a built-in tube can be efficiently produced is also obtained.

It is a figure which shows the external appearance of a vacuum cleaner provided with the flexible hose with a tube which concerns on this invention. It is a partial cross section figure which shows the structure of the flexible hose with a tube of 1st Embodiment of this invention. It is sectional drawing which expanded and showed the part to which the hose main body and tube of the flexible hose with a built-in tube of 1st Embodiment of this invention are joined. It is sectional drawing which expanded and showed the hose wall part of the hose main body which comprises the tube built-in flexible hose of 1st Embodiment of this invention. It is sectional drawing of the flexible strip used for manufacture of the hose main body which comprises the tube built-in flexible hose of 1st Embodiment of this invention. It is sectional drawing which expanded and showed the part to which the hose main body and tube of the flexible hose with a built-in tube of 2nd Embodiment of this invention are joined. It is sectional drawing which expanded and showed the part to which the hose main body and tube of the flexible hose with a built-in tube of 3rd Embodiment of this invention are joined. It is sectional drawing which expanded and showed the part to which the hose main body and tube of the flexible hose with a built-in tube of 4th Embodiment of this invention are joined.

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the individual embodiments shown below, and can be carried out by changing the form and application. As a first embodiment, a tube built-in flexible hose 1 according to an embodiment of a household vacuum cleaner will be described. FIG. 1 shows the overall appearance of a vacuum cleaner. The flexible hose 1 with a built-in tube is connected to an intake port provided in the vacuum cleaner main body 99 via a connecting pipe (mouth member) 95. The other end of the flexible hose 1 with a built-in tube is connected to the hand operation unit 98, and the extension tube 97 and then the floor nozzle 96 are connected to the hand operation unit 98, and the electric vacuum cleaner. Is configured.

The tube built-in flexible hose 1 includes a plurality of conductive wires. The conductive wire is inserted into the tube of the tube-containing flexible hose 1. By means of the conductive wire, an input signal of a switch provided in the hand operation section 98 can be transmitted to the cleaner body 99, or power can be supplied to the brush driving motor built in the floor nozzle 96. In the vacuum cleaner, the tube built in the flexible hose 1 with a built-in tube can also be used for sending liquid such as cleaning liquid or reflux air.

2 and 3 show the structure of the tube-containing flexible hose 1 according to the first embodiment of the present invention. In FIG. 2, the upper left half is a cross-sectional view and the rest is shown in appearance. FIG. 3 is an enlarged cross-sectional view of a portion where the hose wall and the tube are joined. In these drawings, the tube 3 is shown not as a cross section but as an external appearance, and the conductive wires inserted through the tube 3 are not shown.

A flexible hose 1 with a built-in tube has a flexible hose body 2 having a hose wall formed in a substantially cylindrical shape by a synthetic resin having flexibility, and a flexible tube 3 joined together by an adhesive 4. Flexible hose. The tube 3 is disposed along the hose length direction on the inner peripheral surface of the flexible hose body 2 and is integrally bonded.

The structure of the flexible hose body 2 is shown in FIG. The flexible hose body 2 has a hose wall 21 in which a flexible strip T made of a synthetic resin is spirally wound and side edges of adjacent flexible strips T are integrated. Flexible hose. In the present embodiment, the flexible strip T has a substantially S-shaped cross-section portion 21T that becomes the hose wall 21 and a portion 22T that becomes the lip 22 as shown in FIG. .

That is, in this embodiment, the flexible hose body 2 is a hose in which the hose wall 21 and the lip 22 are integrated. The hose wall 21 has a spiral ridge on the inner peripheral surface thereof. In other words, the inner peripheral surface of the hose wall 21 is provided with concave and convex strips that form a concave groove and a convex strip when viewed from the inside of the hose in a spiral shape. Further, the hose wall 21 is formed in a loose shape by the S-shaped cross-section portion 21T of the flexible strip T, and the concave groove portion on the inner periphery of the hose is directly a convex strip portion on the outer peripheral surface of the hose. .

And the lip | rip 22 is provided in the inner peripheral surface of the hose wall 21 spirally along the concave groove so that the concave groove provided in the inner peripheral surface may be covered. In the flexible hose body 2, the lip 22 and the inner peripheral portion 204 of the hose wall 21 are located on the innermost peripheral side of the hose. Only the inner periphery 204 is exposed. That is, in the flexible hose main body 2, the inner peripheral portion arranged on the innermost hose side of the hose main body has two spiral portions, the lip 22 and the inner peripheral portion 204. In other words, the inner peripheral portion arranged at the innermost peripheral portion of the hose in the inner peripheral surface of the flexible hose body has two spiral regions S1 and S2 alternately arranged in a spiral shape. Yes. In this embodiment, the lip 22 corresponds to the first spiral region S1, and the inner peripheral portion 204 corresponds to the second spiral region S2.

When the tube 3 is joined and integrated to the inner peripheral surface of the flexible hose body 2 by the adhesive 4, the tube 3 is arranged so that the lip 22 and the inner peripheral portion 204 face each other, and the hose body 2 and the tube 3 are bonded by an adhesive 4. As the adhesive 4, an adhesive having good adhesion to the tube 3 is selected.

Here, the lip 22 of the hose body 2 and the inner peripheral portion 204 of the hose wall are formed of different resin materials, and the resin material constituting the lip 22 and the resin material constituting the inner peripheral portion 204 are: The adhesion to the adhesive 4 is different. In other words, the surfaces of the two spiral regions S <b> 1 and S <b> 2 provided on the innermost circumference of the hose body have different adhesive properties to the adhesive 4.

In the present embodiment, the resin constituting the lip 22 (first spiral region S1) is a resin having high adhesiveness to the adhesive material 4, and the inner peripheral portion 204 (second spiral region S2) of the hose wall. ) Is a resin having low adhesion to the adhesive 4 (substantially does not adhere). As a result, in the tube built-in flexible hose 1, the tube 3 and the flexible hose body 2 are integrated (bonded) by the adhesive 4 at the lip 22 (first spiral region S <b> 1). On the other hand, the inner peripheral portion 204 (second spiral region S2) of the hose wall is not substantially bonded (bonded) and integrated.

Here, in the second spiral region S2, the hose body 2 and the tube 3 (adhesive 4) are not substantially bonded and integrated (substantially non-bonded). The bonding between the hose body 2 and the tube 3 (adhesive material 4) in the second spiral region S2 is not limited to the bonding, but due to the displacement or force applied when the flexible hose 1 with a built-in tube is used. It includes a weak adhesive state that will be damaged (peeled).

Examples of the synthetic resin constituting the flexible hose body 2 and the tube 3 include relatively soft synthetic resin materials such as polyolefin resins. Examples of the polyolefin resin include polypropylene resin (PP), polyethylene resin (PE), and ethylene vinyl acetate copolymer resin (EVA). A soft vinyl chloride resin (PVC resin), a thermoplastic elastomer (TPE), or the like can be used, and the flexible hose body 2 and the tube 3 may be formed of other resin materials.

As the adhesive 4, a hot melt adhesive made of the same kind of resin as the flexible hose body 2 and the tube 3 can be used. Also, other adhesive materials such as an adhesive using a solvent and a reactive adhesive can be used as the adhesive 4. Alternatively, the tube 3 may be made of a thermoplastic resin, a part of the surface of the tube 3 may be melted, and the portion may be used as the adhesive 4 to adhere to the hose body 2.

In the present embodiment, the hose wall portion 21 (the S-shaped portion 21T of the strip T) of the flexible hose body 2 is made of an olefin resin having a melting point of 110 ° C., particularly a linear low density polyethylene resin (LLDPE). The hose wall inner peripheral portion 204 (second spiral region S2) disposed at the innermost inner periphery of the hose is also made of the same resin. On the other hand, the lip 22 (the lip portion 22T of the strip T, the second spiral region S2) of the flexible hose body 2 is composed of an olefin resin having a melting point of 90 ° C., particularly an EVA resin containing a high vinyl content. . A thermoplastic adhesive (EVA resin) is used as the adhesive 4.

By selecting such a material, the hose wall portion 21 and the lip 22 are joined and integrated using co-extrusion to form a flexible resin strip T, and the melting temperature and bonding conditions of the adhesive 4 By appropriately adjusting the lip 22, the lip 22 and the adhesive material 4 can be bonded while making the hose wall inner peripheral portion 204 and the adhesive material 4 substantially non-bonded, particularly utilizing the difference in melting point.

Of the two spiral regions S1 and S2, one means is bonded to the adhesive 4 and the other is not substantially bonded to the adhesive 4, and the surface between the spiral regions S1 and S2 What is necessary is just to vary the adhesiveness of. In order to make the adhesiveness different, the difference in melting point can be used as in the present embodiment, or the degree of compatibility of the resin can be made different as in the embodiment described later. Alternatively, either or both of these two regions are subjected to a surface treatment that increases the adhesion or weakens the adhesion (substantially non-adhesion), and the surface between these spiral regions S1 and S2 The adhesiveness may be different from each other.

The manufacturing method of the tube built-in flexible hose 1 is demonstrated.
The tube 3 is manufactured by a known method such as extrusion molding or a so-called continuous blow molding method.

In manufacturing the flexible hose body 2, first, two types of resin materials are supplied to an extruder, and these resin materials are co-extruded in a semi-molten state, so that a flexible strip as shown in FIG. Create T. The strip T has a substantially S-shaped portion 21T formed by sequentially connecting an inward side edge 201, an outer periphery 202, a rising portion 203, an inner periphery 204, and an outward side edge 205, A lip portion (extension portion) 22T branched from a portion where the peripheral portion 204 and the outward side edge portion 205 are connected is provided. The substantially S-shaped portion 21T is made of LLDPE resin and the lip portion 22T is made of EVA resin. Extruded and formed. The extruded strip T is then cooled and its cross-sectional shape is fixed.

Thereafter, the flexible hose body 2 is manufactured from the flexible strip T by a so-called spiral molding method. A flexible strip T is spirally wound around a guide shaft of a known hose manufacturing apparatus. The strip T is wound so that the inward side edge 201 is overlapped with the outward side edge 205 of the strip that has been wound in advance, and the inward side edge 201 and the outward are overlapped with each other. By filling and adhering the adhesive 30 between the side edge portions 205, they are joined and integrated, so that the substantially S-shaped portion 21T becomes the hose wall 21 having the spiral irregularities, and the lip portion 22T is connected to the lip 22. Thus, the flexible hose body 2 is continuously manufactured.
As the adhesive 30, a hot-melt adhesive made of the same type of resin as the substantially S-shaped portion 21T of the strip T can be used.

The obtained flexible hose main body 2 is cut into a predetermined length, the tube 3 is inserted into the hose main body along the length of the hose, and the tube 3 is connected to the inner periphery of the hose main body 2 using the adhesive 4. The tube-mounted flexible hose 1 is obtained by being integrated with the surface. This adhesion process can be performed by a known adhesion process disclosed in European Patent EP1011960 (B1), International Publication WO2008 / 035484, or the like.

Then, by appropriately adjusting the selection of the adhesive and the bonding conditions in the bonding step, the inner peripheral portion of the flexible hose body 2 can be used in one spiral region S1 as in the above embodiment. The flexible tube 3 is joined (bonded) to each other, and in the other spiral region S2, the inner peripheral portion of the flexible hose body 2 and the flexible tube 3 are not substantially joined. A flexible hose 1 can be obtained.

The operation and effect of the tube built-in flexible hose 1 will be described.
In the tube built-in flexible hose 1, the innermost part of the hose body 2 that is disposed so as to oppose the tube 3 and the hose body 2 has two spiral regions with different adhesive properties to the adhesive 4. S1 and S2 are provided. In one spiral region S1, the inner peripheral portion of the flexible hose body 2 and the flexible tube 3 are joined to each other, and in the other spiral region S2, The inner peripheral part of the flexible hose body 2 and the flexible tube 3 are not substantially joined. Therefore, the hose body 2 and the tube 3 are bonded intermittently along the longitudinal direction of the tube.

If the hose body 2 and the tube 3 are continuously bonded, the hose wall of the bonded portion is hardened and hardly deformed due to the influence of the adhesive 4 and the tube 3, and the hose body is not deformed. Therefore, the flexibility and stretchability of the tube built-in flexible hose are hindered. On the other hand, according to the flexible hose 1 with a built-in tube, since the hose body 2 and the tube 3 are intermittently bonded along the longitudinal direction of the tube, the tube is substantially bonded to the hose wall 21. In the part which is not, since deformation | transformation is accept | permitted, stretchability is not prevented. Therefore, according to the said tube built-in flexible hose 1, it can suppress that the stretchability and bendability of the flexible hose 1 are inhibited at the site | part which adhered the tube 3 penetrated inside the hose.

In particular, like the flexible hose 1 with a built-in tube of the present embodiment, the adhesive 4 is a thermoplastic adhesive typified by a hot melt adhesive, and the inner peripheral portion of the flexible hose body 2 is flexible. The melting point of the synthetic resin that forms the spiral region S1 where the tubes 3 are joined together forms the spiral region S2 where the inner peripheral portion of the flexible hose body 2 and the flexible tube 3 are not substantially joined together. If it is lower than the melting point of the synthetic resin, the adhesion / non-adhesion between the hose body 2 and the tube 3 can be easily controlled, and the tube-containing flexible hose 1 can be efficiently manufactured.

In this embodiment, the difference between the melting points of the resins constituting the two spiral regions is set to 20 ° C. The difference between the melting points is preferably 10 to 50 ° C., particularly preferably about 15 to 30 ° C.

Further, like the flexible hose 1 with a built-in tube of the present embodiment, the hose body 2 is provided with a lip 22 so as to branch from the bellows-like hose wall 21, and the hose body 2 is provided at the lip 22 portion. It is preferable that a spiral region S1 where the tube 3 and the tube 3 are bonded is formed. In this way, the hose body 2 and the tube 3 are bonded only at the lip portion 22 branched from the hose wall 21, and the bellows-like hose wall portion 21 has a portion bonded to the adhesive 4. Therefore, it is possible to effectively prevent the hose wall portion 21 from being inhibited from being deformed or stretched, and hindering the stretchability or bendability of the tube built-in flexible hose 1.

The present invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above embodiment will be mainly described, and detailed descriptions of the same portions will be omitted. In addition, the embodiments described below can be implemented by combining some of them or replacing some of them.

In FIG. 6, the flexible hose 5 with a built-in tube of 2nd Embodiment of this invention is shown. In the present embodiment, the tube 3 is bonded to the flexible hose body 55 with the adhesive 4, and the cross-sectional shape of the flexible hose body 55 is the same as that in the first embodiment. In the present embodiment, a covering portion 53 is provided on the inner peripheral portion 504 of the bellows-like hose wall 51 so as to face the inside of the hose.

Moreover, in this embodiment, the S-shaped cross-section part which comprises the hose wall 51, and the lip | rip part 52 are comprised by the same resin material. On the other hand, the covering portion 53 is made of a resin material different from the hose wall 51 and the lip 52. More specifically, the hose wall 51 and the lip 52 are made of a resin material that is incompatible with the thermoplastic adhesive 4 (that is, difficult to be thermally welded), and the covering portion 53 is made of a thermoplastic adhesive. It is made of a resin material that is compatible with the material 4 (that is, is easily thermally welded).

That is, in this embodiment, the portion of the covering portion 53 provided on the inner peripheral portion 504 of the hose wall 51 becomes the first spiral region S4 bonded to the adhesive 4 (tube 3), and the lip 52 This is a second spiral region S3 that is not substantially bonded to the adhesive 4 (tube 3).

More specifically, in this embodiment, a hot melt adhesive mainly composed of EVA resin is used as the adhesive 4, and the hose wall 51 and the lip 52 are soft vinyl chloride incompatible with the EVA resin. It is made of resin (soft PVC resin), and the covering portion 53 is made of EVA resin. The inner peripheral portion 504 and the covering portion 53 of the hose wall 51 are integrated via an adhesive layer (not shown) such as a modified EVA resin.

Or in the flexible hose 5 with a built-in tube of the present embodiment, a hot melt adhesive mainly composed of a low density polyethylene resin (LDPE) is used as the adhesive 4, and the hose wall 51 and the lip 52 are combined with the LDPE resin. It is also possible to configure with an incompatible soft vinyl chloride resin (soft PVC resin) and to configure the covering portion 53 with an LDPE resin. In this case, the inner peripheral portion 504 and the covering portion 53 of the hose wall 51 can be integrated by an adhesive layer such as a polyethylene resin grafted with vinyl chloride.

The tube built-in flexible hose 5 of the present embodiment can also be manufactured by the same process as that of the first embodiment, and the stretchability and bendability of the tube built-in flexible hose 5 can be suppressed.

In this way, in the inner peripheral portion arranged at the innermost circumference of the hose, which is arranged so that the hose and the tube are bonded to each other, when two spiral regions arranged alternately are provided, It is arbitrary whether the spiral region can be bonded to the adhesive and which spiral region is not substantially bonded to the adhesive.

Further, as in this embodiment, by utilizing the difference in compatibility with the synthetic resin constituting the thermoplastic adhesive, the difference in adhesion between the first spiral region and the second spiral region is added. However, the adhesion / non-adhesion of the hose body 55 and the tube 3 can be easily controlled, and the tube built-in flexible hose 5 can be efficiently manufactured.

In FIG. 7, the flexible hose 6 with a built-in tube of 3rd Embodiment of this invention is shown. In the present embodiment, the point that the tube 3 is bonded to the flexible hose body 66 by the adhesive 4 is the same as that in the first embodiment. In the present embodiment, the configuration of the flexible hose body 66 is different from the first embodiment and the second embodiment. The flexible hose body 66 is formed by spirally winding a resin-coated metal wire obtained by coating a hard steel wire with a hard resin so as to cover the spiral reinforcement bodies 61 and 61 as the spiral reinforcement body 61 of the hose body. A hose wall 62 formed by spirally winding a strip made of a soft resin is provided, and both are bonded and integrated.

The flexible hose body 66 can be expanded and contracted by extending or bending a hose wall 62 made of a soft resin provided between the spiral reinforcing bodies 61 and 61. In the present embodiment, the hose wall 62 of the flexible hose body 66 is disposed at the innermost peripheral portion of the hose at a portion between the spiral reinforcing bodies 61 and 61, and the tube 3 is joined and integrated. The adhesive 4 can be bonded to this portion.

A portion of the hose wall 62 between the spiral reinforcements 61 and 61 is divided into three spiral regions S5, S6, and S5 provided in parallel with the spiral reinforcement 61. These spiral regions include a first spiral region S5 (part of the A section in the cross section of the hose wall) that adheres to the adhesive 4 and a second spiral region S6 (hose that does not substantially adhere to the adhesive 4). Portion of the B section in the wall cross section) are alternately provided, and when viewed from the inside of the hose, the spiral reinforcing body 61, the first spiral region S5, the second spiral region S6, the first spiral region S5 It is provided so as to be aligned with the spiral reinforcement 61. Thus, three or more spiral regions may be provided on the innermost periphery of the hose.

In the present embodiment, the hose wall 62 is formed of a flexible strip made of a soft resin made of the same material, but a substance that hinders the adhesiveness with the adhesive 4 is present in the second spiral region S6. It is coated. That is, in this region, the surface treatment is made non-adhesive to the adhesive, and the adhesive 4 and the hose wall 62 are not bonded. Therefore, also in this embodiment, it can suppress that the stretchability and bendability of the tube built-in flexible hose 6 are inhibited.

Specifically, the hose wall 62 is made of EVA resin, and the adhesive 4 is also made mainly of EVA resin. In the first spiral region S5 where the coating process is not performed, both are bonded. On the other hand, in the second spiral region S6, for example, a treatment agent (non-adhesive) that does not adhere to the adhesive 4 mainly composed of EVA resin, such as a treatment agent such as a fluorine-based mold release agent or a silicone-based oil repellent. Coating agent) is applied.

Moreover, if the adhesiveness between the adhesive 4 and the hose wall is adjusted by applying a non-adhesive coating material as in the present embodiment, the adhesion / non-adhesion between the hose body 66 and the tube 3 can be easily performed. The tube-containing flexible hose 6 can be efficiently manufactured.

In FIG. 8, the tube built-in flexible hose 7 of 4th Embodiment of this invention is shown. In the present embodiment, the point that the tube 3 is bonded to the flexible hose body 77 with the adhesive 4 is the same as in the other embodiments. In the present embodiment, the structure of the flexible hose body 77 is different from the other embodiments. In the flexible hose body 77, a synthetic resin strip that has been extruded so as to have an uneven strip is spirally wound, and adjacent strip side edges are bonded and integrated to form a bellows-shaped hose wall 72. It is configured. The bellows-like hose wall 72 is configured to have two spiral concavo-convex ridges.

The flexible hose body 77 can be expanded and contracted by deforming and expanding and contracting the bellows-shaped hose wall 72. In the present embodiment, in the bellows-shaped hose wall 72, two spiral regions S7 and S8 formed so as to be convex when viewed from the inside of the hose are arranged at the innermost peripheral portion of the hose. The adhesive 4 that joins and integrates the tube 3 is bonded to this portion.

In the present embodiment, the hose wall 72 is formed of a synthetic resin flexible strip made of the same material, but a substance that improves the adhesiveness to the adhesive 4 is present in the first spiral region S7. It is coated. That is, the surface treatment for improving the adhesiveness with the adhesive 4 is performed. Specifically, the hose wall 62 is formed of PP resin, and the adhesive 4 is mainly formed of LDPE resin. In the second spiral region S8 where the coating process is not performed, the two do not substantially adhere to each other. .

On the other hand, a primer that can be bonded to the adhesive 4 is applied to the first spiral region S7, and the adhesive 4 and the hose wall 72 are bonded to each other. Therefore, also in this embodiment, it can suppress that the stretchability and bendability of the tube built-in flexible hose 6 are inhibited.

As shown in the present embodiment, the spiral region S7 that adheres to the adhesive 4 and the region S8 that does not substantially adhere to the adhesive 4 may not be provided so as to be directly adjacent to each other. .

In addition, as in this embodiment, if a surface treatment is performed to increase the adhesion between the adhesive 4 and the hose wall by applying a primer or the like, adhesion / non-adhesion between the hose body 77 and the tube 3 can be easily performed. It can control and can manufacture the flexible hose 7 with a built-in tube efficiently. The surface treatment for improving the adhesiveness is not limited to the primer, and the surface treatment may be performed by application of a coupling agent or other treatment such as plasma treatment. In addition, the adhesiveness of two spiral area | regions can also be adjusted using together the primer in this embodiment, and the non-adhesive coating material in 3rd Embodiment.

Combinations of resins, treatment agents, etc. for preventing the adhesive 4 and the hose bodies 2, 55, 66, 77 from being bonded to each other or substantially not bonded are limited to the combinations exemplified in the above embodiment. not. Based on known knowledge, the resin, the processing agent, and the bonding conditions may be selected and adjusted so as not to adhere or substantially adhere to each other.

Further, the specific shape and structure of the flexible hose body are not limited to the above embodiment, and various hoses can be used as the flexible hose body. In particular, if a flexible hose having a hose wall formed by integrally winding a flexible strip made of synthetic resin in a spiral shape is adopted, two spiral shapes that are alternately arranged in a spiral shape and have different adhesive properties The region can be easily provided at the time of manufacturing the hose body, and the manufacturing efficiency is high.

The tube 3 may be an extruded straight tube as exemplified in the above embodiment, but may be a tube of another form. For example, it may have a bellows-like tube wall formed by continuous blow molding, and such a tube is particularly preferable because it is soft and does not hinder the flexibility of the hose. Further, the cross section of the tube may be circular, or may be another shape such as an ellipse, a semicircle, or a polygon.

Moreover, in the said embodiment, although demonstrated as an example the flexible hose with a built-in tube for vacuum cleaners, it also applies to other technical fields other than a vacuum cleaner, for example, an industrial hose which sends main liquid and auxiliary liquid The tube built-in flexible hose of the present invention can be applied. That is, the use of the tube built-in flexible hose is not particularly limited.

In the flexible hose of the present invention, a tube is integrated on the inner peripheral surface of the hose, and a conducting wire can be inserted into the tube or other fluid can be flowed.

DESCRIPTION OF SYMBOLS 1 Tube built-in flexible hose 2 Flexible hose main body 21 Hose wall 204 Inner peripheral part 22 Lip S1 1st spiral area S2 2nd spiral area T Flexible strip 21T S-shaped part 22T Lip part 3 Tube 4 Adhesives 5, 6, 7 Flexible hose 55, 66, 77 with built-in tube Flexible hose body 51, 62, 72 Hose wall 52 Lip 61 Spiral reinforcement S4, S5, S7 First spiral region S3 S6, S8 Second spiral region 99 Vacuum cleaner main body 98 Hand operating part 97 Extension pipe 96 Floor nozzle 95 Connection pipe

Claims (5)

A flexible hose body having a hose wall formed by integrally winding a flexible strip made of synthetic resin in a spiral shape, and along the hose length direction on the inner peripheral surface of the flexible hose body A flexible hose having a flexible tube joined and integrated by an adhesive,
Of the inner peripheral surface of the flexible hose body, the inner peripheral portion arranged in the innermost peripheral portion of the hose has two spiral regions alternately arranged in a spiral shape,
The surfaces of the two spiral regions are different from each other in adhesion to the adhesive,
In one spiral region, the flexible hose body inner peripheral portion and the flexible tube are joined together,
A flexible hose in which the inner peripheral portion of the flexible hose body and the flexible tube are not substantially joined in the other spiral region. The adhesive is a thermoplastic adhesive,
The melting point of the synthetic resin that forms a spiral region where the inner peripheral part of the flexible hose body and the flexible tube are joined together,
The flexible hose according to claim 1, wherein the inner peripheral portion of the flexible hose body and the flexible tube are made lower than a melting point of a synthetic resin that forms a spiral region in which the flexible hose body is not substantially joined to each other. The adhesive is a thermoplastic adhesive,
The synthetic resin that forms a spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are joined together is a thermoplastic resin that is compatible with the thermoplastic adhesive,
The synthetic resin that forms a spiral region in which the inner peripheral portion of the flexible hose body and the flexible tube are not substantially joined to each other is a thermoplastic resin that is incompatible with the thermoplastic adhesive. Flexible hose. The flexible hose according to claim 1, wherein the spiral region where the inner peripheral portion of the flexible hose body and the flexible tube are joined to each other is subjected to a surface treatment for improving the adhesion to the adhesive. 2. The spiral region in which the inner peripheral portion of the flexible hose body and the flexible tube are not substantially joined to each other is subjected to a surface treatment that makes the spiral region non-adhesive to the adhesive. The flexible hose as described.

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