JP3929446B2 - Duct hose forming method - Google Patents

Description

The present invention relates to a method for forming a duct hose having flexibility that can be bent flexibly and having a heat insulating layer, for example, as a gas transfer application for cooling and heating.

Conventionally, as a duct hose as described above, a heat insulating muffler duct hose described in Patent Document 1 below is known, and this heat insulating muffler duct hose includes an inner surface layer, an open cell layer, an intermediate sheet layer, a closed cell layer, and The outer surface layer is formed by sequentially laminating each layer from the inside.
JP-A-9-89357

In the heat insulating silencer duct hose, the intermediate sheet layer separating the open cell layer and the closed cell layer is wound in a spiral while polymerizing a part of the resin thin sheet band, and the integrated portions are bonded and integrated. It is formed over the entire length along the axial direction of the duct hose.

In the duct hose as described above, the heat insulating layer made of the foamed resin layer provided between the inner layer and the outer layer needs to maintain the heat insulating property well for a long period of time, and prevents the heat insulating foamed resin layer from being displaced or deformed as much as possible. Is required to do. Also, the intermediate sheet layer without a gap formed over the entire length of the duct hose, there is a failure problem in terms of cost reduction due to weight and material savings desired in the handling of such duct piping work . This invention makes it a subject to satisfy | fill these requirements, and it aims at providing the method which can form the duct hose lightly and at low cost while being able to prevent the shift | offset | difference and deformation | transformation of a heat insulation foaming resin layer reliably .

In order to achieve the above object, the method for forming a duct hose according to claim 1 is a step of forming an inner layer in which a breathable tape is spirally wound and its side edges are connected to each other and retained by a hard spiral reinforcement. A process of forming a sound-absorbing foamed resin layer in which an open-cell structure soft foam tape is spirally wound on the outside of the inner layer, and a closed-cell structure soft foam resin tape on the outside of the sound-absorbing foam resin layer A step of forming a heat-insulating foamed resin layer that is spirally wound in a face-to-face configuration, and between the adjacent side edges of the soft foamed resin tape having the closed-cell structure on the inner peripheral surface of the heat-insulating foamed resin layer The side edges are connected to each other by spirally winding and heat-sealing an intermediate resin band for sealing the gap .
In addition, the method for forming a duct hose according to claim 2 includes a step of forming an inner layer in which a breathable tape is spirally wound and the side edges thereof are connected to each other and the shape is retained by a hard spiral reinforcement, and closed cells are formed outside the inner layer. A step of forming a heat-insulating foamed resin layer in which a soft foamed resin tape having a structure is wound spirally with adjacent side edges of each other, and the closed cell is provided on an inner peripheral surface of the heat-insulating foamed resin layer. It is characterized in that the side edges are connected to each other by spirally winding and heat-sealing an intermediate resin band that seals a gap between adjacent side edges of the soft foam resin tape having a structure. To do.
Further, according to a third aspect of the present invention, in the duct hose forming method according to the first or second aspect, the outer layer is formed by spirally winding a soft resin tape on the outer peripheral surface of the heat insulating foamed resin layer and thermally fusing it. It is characterized by including the process to perform.

The method for forming a heat insulating layer for a duct hose according to the present invention (Claim 1 or 2) is wound around the inner peripheral surface of a heat insulating foamed resin layer formed of a soft foamed resin tape on the outside of the sound absorbing foamed resin layer or the inner layer. The intermediate resin band that is heat-sealed connects the side edges of adjacent soft foam resin tapes to prevent the thermal insulation foam resin layer from shifting and seals the gap between the side edges of the soft foam resin tape. There is no risk that fluid will enter the gap and impair the heat insulation performance.

According to a heat insulating layer forming method for a duct hose according to claim 3 , the outer layer is entirely heat-sealed with the heat insulating foamed resin layer, and between the outer layer and the heat insulating foamed resin layer or between the soft foamed resin tapes. In addition to being able to maintain excellent heat insulation properties for a long time without generating gaps, it is possible to more reliably prevent displacement and deformation of the heat insulating foamed resin layer.

According to the method of the present invention, the intermediate resin band is bonded by thermal fusion between adjacent side edges of the soft foamed resin tape constituting the heat insulating foamed resin layer. Therefore, the gap between the side edges can be sealed at the same time, and a molding method suitable as a heat insulation duct for air-conditioning / heating / air supply in a general house can be provided. Moreover, the intermediate resin band placed on the inner surface of the heat insulating foamed resin layer can be wound at intervals without polymerizing the side edges, and therefore it can be formed with as little material as possible and is handled with light weight. It is easy and the molding cost can be expected to be reduced.

Hereinafter, an embodiment of a heat insulating hose having a heat insulating layer formed by the method of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the heat insulating hose 1 is composed of an inner layer 2, a sound absorbing foamed resin layer 5, an intermediate resin band 6, a heat insulating foamed resin layer 7 and an outer layer 8.

The inner layer 2 is formed by spirally winding a breathable tape 3 made of a non-woven fabric made of polypropylene (PP) or the like, and spirally winding a PP hard resin reinforcing material 4 outside the adjacent side edges. It is formed by connecting and integrating by fusion, and its inner peripheral surface is formed to be substantially smooth.

The sound-absorbing foamed resin layer 5 is formed by winding a soft foam tape T1 having an open cell structure such as a soft polyurethane foam on the outside of the inner layer 2 in a spiral manner with the adjacent side edges butting each other.

The heat-insulating foamed resin layer 7 has a closed cell-structured soft foamed resin tape T2 made of a soft polyethylene (PE) foam on the outside of the sound-absorbing foamed resin layer 5 with its adjacent side edges butted in a spiral shape. The intermediate resin band 6 that is formed by turning and spirally wound between adjacent side edges is connected and integrated with the soft foamed resin tape T2 on the inner peripheral surface thereof. Yes. The intermediate resin band 6 is made of a material that can be heat-sealed with the soft foam resin tape T2. For example, a polyolefin resin such as PE or PP and various thermoplastic elastomers can be used alone or in a blend.

The outer layer 8 is formed by spirally winding a soft resin tape made of the same material as the intermediate resin band 6 on the outer side of the heat insulating foamed resin layer 7 and heat-sealing with the heat insulating foamed resin layer 7 on the inner side. Is integrated by bonding.

The intermediate resin band 6 is formed with a width narrower than that of the soft foam resin tape T2, and does not cover the entire inner peripheral surface of the heat insulating foam resin layer 7, but adjacent contact portions of the soft foam resin tape T2. Covering only the vicinity, the inner peripheral surface of the heat insulating foamed resin layer 7 is exposed between the adjacent intermediate resin bands 6 and 6 and directly faces the inner sound absorbing foamed resin layer 5.

In Example 1 described above, the breathable inner layer and the outer sound-absorbing foamed resin layer combine to provide both heat insulation and sound-absorbing properties. The resin band is wound and fused to the heat insulating foamed resin layer on the outside of the resin band, and this is connected and integrated.

FIG. 2 is a partially enlarged sectional view showing another embodiment of a heat insulating hose in which a heat insulating layer is formed by the method of the present invention, in which the formation of the sound-absorbing foamed resin layer 5 in FIG. 1 is omitted. 1 are the same as those shown in FIG. In this embodiment, the inner layer 2 is formed of a breathable tape to impart breathability. However, it is not always necessary to impart breathability, and a non-breathable tape such as a soft resin tape is spirally wound. The inner layer can be formed by turning.

It is a partial cross section front view of the duct hose which formed the heat insulation layer by the method of this invention. It is a partially expanded sectional view which shows the other Example of the duct hose which formed the heat insulation layer by the method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat insulation hose 2 Inner layer 3 Breathable tape 4 Hard resin reinforcement material 5 Sound-absorbing foam resin layer 6 Intermediate resin belt 7 Heat insulation foam resin layer 8 Outer layer

Claims (3)

A process of forming an inner layer in which a breathable tape is spirally wound and the side edges thereof are connected to each other and shaped by a hard spiral reinforcing body;
A process of forming a sound-absorbing foamed resin layer in which a soft foam tape having an open-cell structure is spirally wound outside the inner layer;
Forming process of heat-insulating foamed resin layer in which a closed-cell structure soft foamed resin tape is wound outside in a spiral shape with the adjacent side edges butting each other.
A duct hose forming method comprising :
By spirally winding and heat-sealing an intermediate resin band that seals the gap between adjacent side edges of the soft foam resin tape of the closed cell structure on the inner peripheral surface of the heat insulating foam resin layer A method for forming a duct hose characterized in that the side edges are connected to each other . A process of forming an inner layer in which a breathable tape is spirally wound and the side edges thereof are connected to each other and shaped by a hard spiral reinforcing body;
Forming a heat-insulating foamed resin layer by spirally winding a soft foamed resin tape having a closed cell structure on the outside of the inner layer with the adjacent side edges butting each other
A duct hose forming method comprising :
By spirally winding and heat-sealing an intermediate resin band that seals the gap between adjacent side edges of the soft foam resin tape of the closed cell structure on the inner peripheral surface of the heat insulating foam resin layer A method for forming a duct hose characterized in that the side edges are connected to each other . The method of forming a duct hose according to claim 1 or 2, further comprising a step of spirally winding a soft resin tape around the outer peripheral surface of the heat insulating foamed resin layer and heat-sealing to form an outer layer .

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