JP3045577B2 - Continuous production method of uneven hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing a hose having irregularities, and more particularly, to a method for producing a hose having a modified cross section with a reinforcing rib or a flange. The hose generally refers to a flexible pipe, but is used herein to mean a large-diameter pipe, a duct, and the like, which are slightly less flexible.

[0002]

2. Description of the Related Art Conventionally, cylindrical uneven hoses have been in great demand, and well-known excellent continuous production methods have been widely practiced. There was no good good continuous manufacturing method. For this reason, if an irregular-section hose with irregularities is required, knowing that the efficiency is poor, post-process the cylindrical irregular-shaped hose and deform it into the required sectional shape, or blow molding. Had been manufactured.

[0003] However, the technology of manufacturing hoses of irregular cross section has been gradually developed. For example, Japanese Patent Publication No. Sho 59-30534 discloses a continuous manufacturing apparatus for square hoses.
Japanese Patent Laid-Open Publication No. H11-15083 discloses a method for manufacturing a hose with irregularities that can also produce a hose with irregularities of irregular cross section. The irregularities on the outer periphery of the hose body are provided for the purpose of reinforcing ribs and flanges.

[0004]

Recently, in order to efficiently use the space of a building or a civil engineering structure, a hose having an irregular cross section is required for an air-conditioning duct, a utility pipe duct, and the like. Has increased. However, although a hose having an irregular cross section can be manufactured by the apparatus described in Japanese Patent Publication No. 30534/1984,
The equipment is complex and inefficient. Also, Japanese Patent Application Laid-Open No. 3-751
In the method described in Japanese Patent Application Publication No. 11 (1999), the material that can be used for the hose body is limited because the hose body is formed by extrusion.
For example, a rubberized cloth cannot be used for the hose wall. Furthermore, since a core for forming the required inner surface cannot be inserted into the hose body, a material that is flexible at room temperature or a material that may be deformed by heat and pressure when forming the convex portion is used. Is restricted.

[0005]

Accordingly, the present inventor has studied a continuous manufacturing method of a hose having an irregular cross section, in which the material used is not restricted and the required material can be used freely. Completed the invention.

According to the present invention, a long sheet as a material of a hose body is supplied continuously or intermittently. First, the cantilever guide whose root portion is configured as a guide for forming a long sheet into a cylindrical shape and whose distal end portion is configured as a core for forming a hose body into a required inner peripheral shape, Cover the long sheet and make it cylindrical, b. Joining both ends of the tubular long sheet to form a tubular body; c. Covering the core with the tubular body to form a hose body having a required inner peripheral shape; d. After setting a mold for injection molding using the hose body as an insert, injection molding is performed to integrally form a convex portion on the outer periphery of the hose body, e. A method for continuously manufacturing a hose with irregularities, wherein the molded hose with irregularities is detached from the core and the injection mold to produce a hose with irregularities. It is preferable that the cantilever shaft is hollow and has a core portion provided with a large number of small holes communicating the outside and the hollow portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS For better understanding of the continuous production method of a hose with irregularities of the present invention, specific embodiments will be described with reference to the drawings. FIG. 1 is a schematic view of an example of an embodiment of a method for continuously manufacturing a hose with irregularities according to the present invention. FIG.
FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1.

First, a long sheet 1 which is a material of a hose with irregularities, that is, a material of a hose body 4 is supplied from a feed roll 5 also serving as a width, and the long sheet 1 is formed into a tubular shape at a root portion. Of the cantilever shaft which is formed as a core 6 for forming the hose body 4 into a required inner peripheral shape at the distal end portion, and is formed in a tubular shape. Here, the guide 6 has a function of a jig for bending the long sheet 1 into a tubular shape and joining the both end portions 2 thereof.
In this embodiment, the cantilever shaft is L at the guide 6 in the axial direction.
It is bent in the shape of a letter. The cross-sectional shape of the guide 6 is usually not uniform, and is formed into a shape convenient for bending the long sheet 1 into a tubular shape and joining the two end portions 2 thereof. When the guide 6 alone is not enough to form the long sheet 1 into a tubular shape, the guide 6 is used as a core and a long auxiliary sheet 1 is used inside the long sheet 1 by using, for example, a ring-shaped auxiliary guide. It can be easily made into a tubular shape.

The material of the hose body 4 is not particularly limited as long as the material is not inappropriate for the hose. For example, plastics and rubber and their foam sheets, fabrics,
A composite material such as leather, paper, or a rubberized cloth or a plastic containing glass fiber can be used. Alternatively, a semi-cured sheet such as a prepreg may be used, formed into a cylinder having a required cross-sectional shape, and then cured to form a hose body.
In addition, the long sheet 1 usually uses a single sheet. In a special case, for example, a plurality of sheets are overlapped with each other in order to double a hose wall or use a different material for one part. Or they can be used side by side.

Next, both ends 2 of the tubular sheet are joined to form a tubular body 3. The formation of the cylindrical body 3 is performed by the guide 6
It may be carried out between the core and the core 9 or after the core 9 is put on the core 9, or may be carried out while shifting from the guide 6 to the core 9. As the joining means, adhesion, fusion, pressure bonding, caulking, suturing, or the like is used according to the material to be used. In the present embodiment, the adhesive is applied to both ends 2 of the sheets by the adhesive application device 7 and then joined, and the joined portion is pressed and adhered by the press roll 8 to form the cylindrical body 3. Press roll 8
Has a function of pressing the joint portion and pulling the long sheet 1 from the feed roll 5.

The cylindrical body 3 thus formed is provided with a core 9
Core 9 which has been transferred to the
And is fixed as the hose body 4. This cross-sectional shape can be set not only to a required irregular cross-section such as a triangle or a square, but also to a cylindrical shape. Next, using the hose body 4 as an insert, an injection molding die 10 for integrally forming a convex portion on the outer periphery thereof is set by a mold clamping device (not shown). The injection mold 10 generally includes an upper mold and a lower mold.

When the setting is completed, an injection device (not shown)
Through the nozzle 16 and the runner 15 to the cavity 1
The projection constituent material is injected to the hose 4 and the projection is fused to the outer periphery of the hose body 4 to be integrally formed. The convex component material is vinyl chloride,
Plastics such as polyolefin and synthetic rubber, or fiber reinforced materials thereof are used. Hose body 4
Since the core 9 is inserted into the hose, the hose body 4 is not deformed by heat or pressure during injection molding, and a hose having a precise shape can be manufactured using any material. When the injection molding is completed, the injection molding die 10 is opened, and the manufactured uneven hose 17 is separated from the apparatus by the take-off device 11.

The above-described process operation is performed for the long sheet 1
Is supplied continuously or intermittently, and is carried out while moving the cylinder 3 and the hose body 4 continuously or intermittently. Although the selection of the moving method is determined depending on economy, etc., the continuous moving may involve a complicated device.

It is preferable to use a hollow cantilever shaft for use in the present invention and to provide a large number of small holes 13 communicating with the hollow portion 12 in the core 9. By reducing the pressure in the hollow portion 12, the hose body 4 is brought into close contact with the core 9 to form a precise inner peripheral surface, and by applying pressure, the hose body 4 can be separated from the core 9 and moved smoothly. It is.

[0015]

According to the method of the present invention for continuous production of a hose having irregularities, the material used is not limited, and even if the hose body is flexible, even if it is likely to be deformed by heat and pressure during molding of the convex part, It is possible to continuously manufacture a hose with irregular cross section by using the optimum material freely.
For example, a flexible hose body is formed with reinforcing ribs and flanges that also serve as shape retention and reinforcement, and can be bent freely in the longitudinal direction, but the cross section is light and large in diameter while maintaining the required shape. A hose with an irregular cross section can be manufactured. The cross-sectional shape of the convex portion can be freely changed, and its direction can be formed in a ring shape or a linear shape.

If the supply of the long sheet and the injection molding of the convex portion are appropriately adjusted, for example, a flange or the like can be provided at an arbitrary position on the hose body. In addition, by exchanging the cantilever shaft and the mold for injection molding during the production of the hose, it is possible to produce a hose with irregularities having a different cross-sectional shape and a partially different convex shape.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of an embodiment of a method for continuously manufacturing a hose with irregularities according to the present invention.

FIG. 2 is a sectional view taken along line AA ′ in FIG.

[Explanation of symbols]

1: long sheet 2: side end 3: cylindrical body 4: hose body 5: feed roll 6: guide 7: adhesive coating device 8: press roll 9:
Core 10: Injection molding die 11: Take-up device 1
3: Small hole 17: Hose with unevenness

Continuation of the front page (51) Int.Cl. ⁷ identification code FI // B29L 23:18 (58) Fields investigated (Int.Cl. ⁷ , DB name) B29D 1/00-31/00 B29C 45/14 B29C 53/48 B29C 47/00-47/96 B29C 69/02 F16L 11/04

Claims (2)

(57) [Claims] 1. A long sheet, which is a material of a hose body, is supplied continuously or intermittently; a. First, the cantilever shaft guide whose root portion is configured as a guide for forming a long sheet into a cylindrical shape and whose distal end portion is configured as a core for forming a hose body into a required inner peripheral shape, Cover the long sheet and make it cylindrical, b. Joining both ends of the tubular long sheet to form a tubular body; c. Covering the core with the tubular body to form a hose body having a required inner peripheral shape; d. After setting a mold for injection molding using the hose body as an insert, injection molding is performed to integrally form a convex portion on the outer periphery of the hose body, e. A method for continuously manufacturing an uneven hose, comprising: releasing the formed uneven hose from the core and the injection mold to manufacture a uneven hose. 2. The uneven structure according to claim 1, wherein the cantilever shaft is hollow, and a plurality of small holes are provided in the core portion so that the outside and the hollow portion communicate with each other. Hose continuous production method.