JP2015059610A - Synthetic resin hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance weldability among a string band 2 including PET resin, and resin reinforcing members 3, 4, in a synthetic resin hose in which the string band is wound in a helical manner and integrally assembled with the helical resin reinforcing members to form the synthetic resin hose 1 and improve quality of the generated hose 1.SOLUTION: A synthetic resin hose 1 is constituted in such a way that a flexible sheet string band 2 including synthetic resin is wound in a helical manner to form a substantial cylindrical hose wall and side edges of the string band 2 adjacent to each other are connected by helical reinforcing members 3, 4. The helical reinforcing members 3, 4 are connected to surfaces of the side edges of the string band 2 through welding. In the string band 2, a surface of part where at least helical reinforcing members 3, 4 are welded is constituted of polyethylene terephthalate resin. At least a part welded to the string band 2, of the helical reinforcing members 3, 4 is constituted of polyarylate resin. The string band 2 and the helical reinforcing members 3, 4 are integrated through welding of polyarylate resin and polyethylene terephthalate resin.

Description

The present invention is a flexible hose made of synthetic resin excellent in flexibility, in particular, a flexible strip is spirally wound to form a hose wall, and adjacent strip side edges are spirally reinforced. The present invention relates to a flexible hose joined by a body.

A flexible hose having a helical reinforcement body is formed by winding a flexible strip in a spiral shape, and the hose wall can be configured to have a lightweight hose wall for various uses such as a ventilation duct hose, Used as various transport hoses.

For example, in Patent Document 1, a strip made of a laminated composite material in which a resin layer (PET resin layer) and a metal foil layer (aluminum foil layer) are laminated is spirally wound, and the strip side edges adjacent to each other. An invention is disclosed in which a resin reinforcing body (made of PET resin) is bonded and integrated in a spiral shape to form a heat-resistant duct so as to straddle the sheet, and in this invention, airtightness is well maintained, light weight, and lamination It is disclosed that peeling between layers of a composite material can be suppressed.

JP 2011-80512 A

The hose as disclosed in Patent Document 1 has a hose wall constituted by a strip containing a PET resin and can be a particularly lightweight hose, and the side edge portion of the strip and the resin reinforcing body are integrally bonded. In particular, it is excellent as a duct hose for blowing air.

However, in the hose as disclosed in Patent Document 1, the PET resin layer of the strip and the reinforcing body made of PET resin are bonded and integrated, but there is still room for improvement in this bonding and integration. For example, when attempting to integrate the reinforcing body and the strip side edge by welding, the welding tends to be insufficient even though the PET body of the reinforcing body and the strip is the same material. If the reinforcement and the strip side edge are not sufficiently welded, the hose may be separated or the airtightness of the hose may be impaired.

An object of the present invention is to improve the quality of a hose obtained by increasing the weldability between a strip containing a polyethylene terephthalate resin (PET resin) and a resin reinforcing body.

As a result of intensive studies, the inventor used a polyarylate resin in a portion where the resin reinforcement is welded to the strip, and the polyethylene terephthalate resin (PET resin) of the strip and the polyarylate resin (PAR) of the resin reinforcement Resin) and the present invention was completed.

The present invention forms a substantially cylindrical hose wall by spirally winding a strip made of a flexible sheet material containing a synthetic resin, and by means of a synthetic resin helical reinforcement body, A synthetic resin hose in which side edges adjacent to each other are joined to each other, wherein the spiral reinforcing body is joined to the surface of the side edge of the strip by welding, and the strip is at least spirally reinforced. The surface of the part to which the body is welded is made of polyethylene terephthalate resin, and at least the part to be welded to the strip is made of polyarylate resin, the polyarylate resin and the polyethylene terephthalate resin This is a synthetic resin hose in which the strip side edge portion and the spiral reinforcing body are joined by welding (1st invention).

In the present invention, it is preferable that the entire spiral reinforcing body is made of polyarylate resin (second invention). Moreover, in this invention, it is preferable that the flexible sheet material which comprises a strip is the lamination sheet material which laminated | stacked the layer which consists of a polyethylene terephthalate resin, and the layer which consists of metal foil (3rd invention).

According to the synthetic resin hose of the present invention (first invention), the weldability of the strip constituting the hose and the resin reinforcing body can be improved, and the quality of the obtained hose can be improved.

Furthermore, as in the second invention, when the entire spiral reinforcing body is made of polyarylate resin, the weldability is further improved and the hose is less likely to be crushed. Further, as in the third invention, when the flexible sheet material constituting the strip is a laminated sheet material in which a layer made of polyethylene terephthalate resin and a layer made of metal foil are laminated, the hose wall is shielded from light. This improves the performance and protects the objects inside the hose from external UV rays.

It is a partial cross section figure which shows the structure of the synthetic resin hoses of 1st Embodiment. It is an expanded sectional view showing the details of the joined part of the hose wall and reinforcement of the synthetic resin hose of the first embodiment. It is a schematic diagram which shows the manufacturing process of the synthetic resin hoses of 1st Embodiment. It is an expanded sectional view which shows the other structural example of the joint part of the hose wall of a synthetic resin hose and a reinforcement body. It is an expanded sectional view which shows the other structural example of the joint part of the hose wall of a synthetic resin hose and a reinforcement body.

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. FIG. 1 shows a partial cross-sectional view of the synthetic resin hose 1 of the first embodiment. The upper side of the figure is a sectional view, and the lower side of the figure is an external view. In FIG. 2, the detail of the junction part of the hose wall and reinforcement body of the synthetic resin hose 1 of 1st Embodiment is shown. In addition, the synthetic resin hose of the present invention does not necessarily require that all the constituent materials be synthetic resins. As in the embodiments described below, metal materials and natural fibers are used depending on the functions required. A hose containing a material other than a synthetic resin material such as a material may be used.

The synthetic resin hose 1 is configured by forming a substantially cylindrical hose wall by spirally winding a sheet-like strip 2 having flexibility, and the helical reinforcement bodies 3 and 4 made of synthetic resin are used to form the above-mentioned strip. It has a structure in which adjacent side edges of the band 2 are joined together. The spiral reinforcement bodies 3 and 4 function as a reinforcement body for maintaining the cylindrical shape of the hose, and the spiral reinforcement bodies 3 and 4 are formed on the side edges of the strip 2 wound spirally. By being arranged and joined in between, the hose wall can be prevented from being separated, and the airtightness of this portion can be ensured. In the present embodiment, the spiral reinforcement body 3 is joined and integrated with the inner peripheral surface of the wound strip 2 so that the spiral reinforcement body 3 is located inside the hose wall. It is joined and integrated with the outer peripheral surface of the wound strip 2 so as to be located outside the wall.

The strip 2 is made of a flexible sheet material containing a synthetic resin. In the strip 2, at least the surface of the portion to which the spiral reinforcing bodies 3 and 4 are welded is made of polyethylene terephthalate resin (hereinafter also referred to as “PET resin”). Other parts may be made of other materials as required. In the present embodiment, a laminated composite material having a laminated structure in which an intermediate layer 23 made of an aluminum foil is sandwiched between an inner layer 21 made of a PET resin film and an outer layer 22 is used for the strip 2. That is, in this embodiment, the PET resin layers 21 and 22 exist on the inner peripheral surface and the outer peripheral surface of the strip 2. In addition, as will be described later, the strip 2 can also be configured by a flexible sheet material having other configurations.

The spiral reinforcing bodies 3 and 4 joined to the side edge of the strip 2 are synthetic resin reinforcing bodies. Note that that the reinforcing body is made of a synthetic resin means that the main body of the reinforcing body is made of a synthetic resin, and does not mean that the reinforcing body does not contain any material other than the synthetic resin. For example, hard steel wires, conductive wires, natural fibers, or the like can be added to the synthetic resin reinforcing bodies 3 and 4 as necessary.

The spiral reinforcing bodies 3 and 4 are joined to the surface of the side edge portion of the strip 2, that is, the inner peripheral surface and the outer peripheral surface by welding. In the spiral reinforcing bodies 3 and 4, at least a portion welded to the strip 2 is made of polyarylate resin (hereinafter also referred to as “PAR resin”). In this embodiment, as for the spiral reinforcement bodies 3 and 4, all the reinforcement bodies are comprised with PAR resin.

Therefore, in the synthetic resin hose 1, the side edge of the strip 2 and the spiral reinforcements 3 and 4 are joined by welding the polyarylate resin of the spiral reinforcements 3 and 4 and the polyethylene terephthalate resin of the strip 2. It is integrated.

Here, the polyarylate resin is a synthetic resin belonging to an amorphous thermoplastic resin, which is based on polycondensation of a dihydric phenol and a dibasic acid such as phthalic acid / carboxylic acid. Is a thermoplastic synthetic resin called chemical name poly 4,4'-isopropylidenediphenylene terephthalate / isophthalate copolymer. The polyarylate resin is sold, for example, by Unitika Co., Ltd. under resin names such as “U polymer” and “U-100” (“U polymer” is a registered trademark of Unitika Co., Ltd.).

A method for manufacturing the synthetic resin hose 1 will be described. The synthetic resin hose 1 can be manufactured by a so-called spiral molding method. FIG. 3 schematically shows a process of forming the synthetic resin hose 1 by a spiral molding method. Prior to forming the hose, first, a strip 2 (tape T in FIG. 3) to be a hose wall is prepared. The tape T may be wound around a reel, etc., and may be used after being unwound from the reel when forming a hose.

The hose forming material is sequentially supplied to the hose forming shaft SFT capable of spiral forming of the hose to form the hose. The hose forming shaft SFT is configured so as to be able to rotate and feed the supplied material while spirally winding the supplied material. By using a resin extruder (not shown), the PAR resin, which is a constituent material of the spiral reinforcing bodies 3 and 4, is extruded into a string having a predetermined cross-sectional shape in a semi-molten state, and the semi-molten resin strings S1, S2 and To do. The semi-molten resin string S <b> 1 corresponds to the spiral reinforcement body 3, and the semi-molten resin string S <b> 2 corresponds to the spiral reinforcement body 4.

A semi-molten resin string S1, a tape T, and a semi-molten resin string S2 are supplied in this order to the hose forming shaft SFT, and the synthetic resin hose 1 is formed by spirally winding these materials. The supply positions of these materials are appropriately adjusted so that the spiral reinforcing bodies 3 and 4 are arranged so as to straddle both side edges of the strip 2.

When the semi-molten resin strings S1, S2 and the tape T come in contact with each other on the hose forming shaft, the PET resin of the tape T is heated by the heat amount of the PAR resins of the semi-molten resin strings S1, S2, and the PAR resin and the PET resin Welds. Then, the hose in which the semi-molten resin strings S1, S2 and the tape T are joined and integrated by welding, and both side edges of the spirally wound strip 2 are joined and integrated by the spiral reinforcing members 3, 4. 1 structure is realized. When the cooling water or cooling air is supplied from the cooling device C provided downstream of the molding shaft SFT (right side in FIG. 3) and the hose is cooled with respect to the position where the hose structure is realized, the synthetic resin hose 1 is completed. By performing these steps continuously, a synthetic resin hose 1 of indefinite length can be manufactured continuously.

The operation and effect of the synthetic resin hose 1 will be described. In the synthetic resin hose 1, the polyarylate resin of the spiral reinforcing bodies 3 and 4 and the polyethylene terephthalate resin of the inner layer 21 and the outer layer 22 of the strip 2 are well welded, and the strength and airtightness of the hose 1 are improved. The quality is improved.

According to the study by the inventors, in the prior art, it was not always easy to weld the strip provided with the PET resin to the surface layer with the resin reinforcing body. That is, the strip including the PET resin has poor weldability, and even when the same kind of PET resin is used for the reinforcing body, the strip and the reinforcing body may not be welded well. In addition, we tried to improve weldability by mixing low-melting point PET resin into the reinforcement PET resin or using modified PET resin, but there was no significant improvement in weldability, and the strength of the reinforcement was It was easy to drop, or the reinforcement body was easy to peel off from the strip.

As in the present invention, when polyarylate (PAR) resin is used for the reinforcing body, the reason why the weldability of the strip to the PET resin is good is not clear. However, since the PAR resin has a higher melting point than the PET resin, the temperature at which the PAR resin is supplied to the hose forming shaft in a semi-molten string is high, and the heat amount of the semi-molten resin strings S1 and S2 increases. It is speculated that the fact that the temperature of the PET resin of the strips to be fused is easily increased is one of the reasons why the weldability is good.

Furthermore, if the entire spiral reinforcing bodies 3 and 4 are formed of PAR resin as in the above embodiment, the welding between the reinforcing bodies 3 and 4 and the strip 2 is further improved. This is because if the entire reinforcing body is made of PAR resin, the amount of heat of the semi-molten resin strings S1 and S2 becomes larger, and the weldability of the strip with the PET resin is improved. Inferred. Moreover, when the spiral reinforcement bodies 3 and 4 are entirely formed of PAR resin, an effect that the hose is not easily crushed can be obtained. This effect is derived from the good spring recovery of the PAR resin. Even when the hose is stepped on by mistake, the hose reinforcements 3 and 4 are prevented from being damaged or plastically deformed.

In general, when the strip 2 is constituted by a laminated sheet material including a layer made of a metal foil, heat is easily released from the strip side edge portion to the center portion of the strip through the metal foil. The temperature rise at the edge of the power strip side tends to be hindered, and the weld between the strip and the reinforcing body tends to be insufficient. However, according to the present invention, as shown in the above embodiment, even when a strip having such a metal foil layer is used, the strip 2 and the reinforcing members 3 and 4 can be welded well. Can improve the quality of the hose. If a strip having a metal foil layer can be used as the strip, the light shielding property of the hose wall is improved, which is convenient for protecting an object inside the hose from external ultraviolet rays and the like.

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.

FIG. 4 shows an enlarged view of the structure of the hose wall and the reinforcing body of the synthetic resin hose of the second embodiment. In the present embodiment, the strip 5 serving as a hose wall is made of a flexible laminated sheet material having a two-layer structure in which a PET resin layer 51 on the hose outer peripheral surface side and a nonwoven fabric layer 52 on the hose inner peripheral surface side are laminated. It is configured. In this embodiment, the nonwoven fabric layer 52 is a polyester fiber nonwoven fabric. The nonwoven fabric may be another nonwoven fabric. Also in this embodiment, the entire spiral reinforcing body 6 is formed of PAR resin. In the present embodiment, the spiral reinforcing body 6 has a shape in which the central portion of the reinforcing body protrudes outward in the radial direction of the hose.

Even if the strip 5 has such a configuration, as in the synthetic resin hose 1 of the first embodiment, the PET resin of the strip 5 serving as the hose wall and the PAR resin of the reinforcing body 6 are well welded, The quality of the hose is improved. As described above, the specific structure of the strip to be the hose wall is not particularly limited as long as the surface on which the reinforcement is to be welded is a PET resin layer. May be changed as necessary. Further, the entire strip may be composed of PET resin, that is, the strip may be composed of a single layer of PET resin film.

Further, in the embodiment shown in FIG. 4, the side edges of the spirally wound strip 5 are overlapped with each other, and the lower side from the strip side edge that is outside at the overlapping portion. A reinforcing member 6 made of PAR resin is welded and integrated so as to cover the overlapped portion across the strip side edge. Thus, the concrete form at the time of winding a strip | belt spirally (It winds so that side edge parts may be faced | matched like the form of FIG. 2, or a side edge like the form of FIG. There is no particular limitation on whether the parts are wound so as to overlap each other, and so long as the side edges of the strip can be integrated so that the hose wall does not fall apart by the spiral reinforcing body. It may be changed. Moreover, when superimposing the strip side edge part, you may make it use an adhesive material together in an overlap part.

FIG. 5 shows an enlarged view of the structure of the hose wall and the reinforcing body of the synthetic resin hose of the third embodiment. In this embodiment, the strip 7 is formed along the strip main portion 72 formed of a film-like synthetic resin (for example, rubber film) and the side edge of the strip main portion. It is comprised by the side edge lamination | stacking part 71 made from integrated PET resin. Thus, you may make it comprise only the part (surface which should be welded) which should be welded with a reinforcement body among strips with PET resin. In addition, the portion (layer) of the PET resin of the strip and the portion (layer) made of another material may be integrated by means of co-extrusion, lamination, coating, or the like, or an adhesive or pressure-sensitive adhesive, or other You may integrate using the means of.

Moreover, in this embodiment, the reinforcement body 8 is a reinforcement body of the laminated structure which compounded different materials. That is, the side where the reinforcing body 8 is bonded to the strip 7 is a PAR resin layer 81, and the outer peripheral side of the reinforcing body 8 is a PET resin layer 82. Also in such an embodiment, the PAR resin layer 81 of the reinforcing body 8 and the PET resin side edge laminated portion 71 of the strip 7 are well welded, and the quality of the hose is improved. That is, the entire reinforcing body may be formed of PAR resin, or the portion welded to the strip is formed of PAR resin and the other portion is made of other resin as in this embodiment. It may be formed.

In forming the reinforcing body 8 of the present embodiment, the PAR resin layer 81 and the PET resin layer 82 are laminated so that the PAR resin and the PET resin are co-extruded, and the hose forming shaft SFT is formed. It may be supplied and integrated with the strip 7, or first the PAR resin is extruded and supplied to the hose forming shaft so that only the PAR resin layer 81 is obtained, and then integrated with the strip 7. Then, the PET resin layer 82 is obtained by extruding the PET resin and supplying it to the hose forming shaft. The PAR resin layer is then wound and overlapped with the PAR resin layer 81 previously integrated with the hose. 81 and a PET resin layer 82 may be laminated.

The synthetic resin hose of the present invention is lightweight and airtight, and can be particularly preferably used as a blower duct hose or a ventilation duct. The synthetic resin hose of the present invention can also be used for transferring liquids, granules, powders and the like. Furthermore, the synthetic resin hose of the present invention can be used as a protective cover by inserting cables, piping, tubes, and the like inside the hose.

The synthetic resin hose of the present invention can be used for, for example, a blower duct hose and has high industrial utility value.

1 Synthetic resin hose 2 Strip (hose wall)
21 Inner layer 22 Outer layer 23 Intermediate layer 3, 4 Spiral reinforcement SFT Hose forming shaft T Tape S1, S2 Semi-molten resin string C Cooling device 5, 7 Strips 6, 8 Spiral reinforcement

Claims (3)

A strip made of a flexible sheet material containing a synthetic resin is spirally wound to form a substantially cylindrical hose wall, and the spiral reinforcing bodies made of synthetic resin make the strips adjacent to each other. A synthetic resin hose with edges joined together,
The spiral reinforcement is joined to the surface of the strip side edge by welding,
The strip is composed of a polyethylene terephthalate resin at least on the surface of the portion where the helical reinforcement is welded,
The helical reinforcing body is composed of a polyarylate resin at least a portion welded to the strip.
A synthetic resin hose in which the strip side edge and the spiral reinforcing body are joined by welding polyarylate resin and polyethylene terephthalate resin. The synthetic resin hose according to claim 1, wherein the entire spiral reinforcing body is made of polyarylate resin. The synthetic resin hose according to claim 1 or 2, wherein the flexible sheet material constituting the strip is a laminated sheet material obtained by laminating a layer made of polyethylene terephthalate resin and a layer made of metal foil.

Images