JPH0655658A - Manufacture of hose - Google Patents

Abstract

PURPOSE:To enable a continuous production by making it possible to firmly bond a reinforcing layer and an outer surface layer to each other without using an adhesive. CONSTITUTION:In a method for manufacturing a hose wherein an outer surface layer 5 comprising thermoplastic resin is superposed on the outside of a fiber reinforcing layer 3 on the inside of which an inner surface layer 2 comprising thermoplastic resin is superposed, when the layer 5 is superposed, the surface temperature of the layer 3 is preheated to a temperature equal to or higher than a softening point of the thermoplastic resin of the outer surface layer and a molten thermoplastic resin is applied directly to the surface of the preheated reinforcing layer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hose having thermoplastic resin as an inner and outer surface layer and a reinforcing layer made of fibers such as polyester, nylon, cotton, etc. between the layers, more specifically, the reinforcing layer and the outer surface. The present invention relates to a method for manufacturing a hose having improved adhesion to a layer and enabling continuous production.

[0002]

2. Description of the Related Art Conventionally, when manufacturing this type of hose,
If the outer surface layer of the thermoplastic resin is directly coated on the outer side of the fiber reinforcing layer, sufficient adhesiveness cannot be obtained, so that there is a drawback that the fiber reinforcing layer and the outer surface layer are easily delaminated by repeated bending. Therefore, as a method for adhering the reinforcing layer and the outer surface layer resin, a moisture-curable adhesive or a solvent-based adhesive is interposed between the reinforcing layer and the outer surface layer.

However, when a moisture-curable adhesive is used, it takes a maturing time for a curing reaction before the outer-layer resin is coated after the moisture-curable adhesive is applied and impregnated on the reinforcing layer. Therefore, there is a problem that the hose cannot be continuously manufactured on a series of manufacturing lines, and the productivity cannot be improved. Further, even when a solvent-based adhesive is used, there is a problem that the hose cannot be continuously manufactured because the solvent volatilization time is required, and the volatilization of the solvent causes environmental deterioration.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for producing a hose which enables continuous production by enabling strong adhesion between a reinforcing layer and an outer surface layer without using an adhesive. To provide.

[0005]

A method of manufacturing a hose according to the present invention is directed to a hose in which an outer surface layer made of a thermoplastic resin is laminated on the outer side of a fiber reinforced layer having an inner surface layer made of a thermoplastic resin laminated on the inner side thereof. In the production method, in laminating the outer surface layer of the thermoplastic resin, the surface temperature of the fiber reinforcing layer is preheated to a softening point of the outer surface layer thermoplastic resin or higher, and a molten state is formed on the surface of the preheated fiber reinforcing layer. It is characterized in that the thermoplastic resin is directly coated and molded.

Thus, after the surface temperature of the reinforcing layer is preheated to the softening point of the outer surface layer thermoplastic resin or more, the thermoplastic resin in a molten state is directly coated as the outer surface layer, so that the reinforcing layer is not used. Since the outer surface layer and the outer surface layer can be firmly bonded to each other, the hose can be continuously manufactured on a series of manufacturing lines. Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view showing a hose molding manufactured by the method of the present invention, FIG. 2 is a front view showing a hose manufacturing apparatus according to an embodiment of the present invention,
FIG. 3 is a side view showing the resin extruder.

In the figure, a hose molding 1 comprises a heating device arranged as a series of manufacturing lines after braiding or spirally winding an organic fiber as a reinforcing layer 3 on the outside of an inner surface layer 2 made of a thermoplastic resin. 11, the resin extruder 10, the cooling device 13, and the take-up machine 14 are continuously supplied. The heating device 11 is for controlling the surface temperature of the reinforcing layer 3 above the softening point of the outer surface layer thermoplastic resin. The surface temperature of the reinforcing layer 3 is measured by a surface temperature measuring machine 12 provided immediately before the resin extruder 10. The resin extruder 10 heat-melts the thermoplastic resin supplied from the hopper 15 in the cylinder portion, and melts the thermoplastic resin from the head portion of the reinforcing layer 3
It is adapted to be extruded upward to cover and mold the outer surface layer 5. The cooling device 13 is configured to cool and solidify the outer surface layer 5 formed by coating on the reinforcing layer 3. In this way, the hose molded body 1 in which the outer surface layer 5 is provided on the outer side of the reinforcing layer 3
Is taken up by the take-up machine 14 and taken up by a take-up device (not shown).

As described above, after the surface temperature of the reinforcing layer 3 is preheated to the softening point of the outer surface layer thermoplastic resin or above, the molten thermoplastic resin is extruded onto the surface of the preheated reinforcing layer 3 to form the outer surface layer. Since the reinforcing layer 3 and the outer surface layer 5 can be firmly adhered without using an adhesive by directly covering and molding 5, the hose molded body 1 is extruded from the inner surface layer 2 to be braided with the reinforcing layer 3. Then, the outer surface layer 5 can be continuously manufactured until extrusion molding.

In the present invention, the surface temperature of the reinforcing layer 3 when the thermoplastic resin for the outer surface layer 5 is extruded needs to be equal to or higher than the softening point of the outer surface layer thermoplastic resin. This is because when the surface temperature of the reinforcing layer 3 is lower than the softening point of the outer surface layer thermoplastic resin,
This is because the adhesive strength between the reinforcing layer 3 and the outer surface layer 5 becomes insufficient, so that peeling between layers tends to occur during pressing. Further, in the present invention, as the thermoplastic resin constituting the inner surface layer 2 and the outer surface layer 5, a usual hose compound such as nylon, polyester, urethane or the like can be used, and as the reinforcing layer 3, Fibers such as nylon, polyester and cotton can be used.

[0010]

【Example】

<No. 1> Polyester elastomer resin (Hytrel made by Toray DuPont) is used as the inner layer, and the inner diameter is 9.5 mm,
After extrusion molding to an outer diameter of 11.5 mm, a polyester fiber (Toray Tetron) was braided as a reinforcing layer on the outer side of the inner surface layer by a braiding machine (Kurg Brader). Then, in a state where the reinforcing layer was preheated under the following heating conditions, a polyester elastomer resin (Perprene manufactured by Toyobo: softening point 89 ° C) was continuously formed on the reinforcing layer as an outer surface layer under the following extrusion conditions to have an outer diameter of 15.8 mm. Extruded.

External layer resin extrusion conditions Extruder: ES-40 cylinder temperature manufactured by Ikegai Tekko Co., Ltd .; 150 to 225 ° C. head temperature; 220 ° C. Reinforcing layer heating condition heating device; Far infrared lamp 1500 W × 4 surface temperature measuring instrument; infrared Radiation thermometer In the above, when passing through the reinforcing layer heating device, the intensity of the far-infrared lamp is changed with a slider to measure the reinforcing layer surface temperature at 25 ° C (room temperature), 60 ° C, 80 ° C, 100 ° C.
A high-pressure hose was manufactured by forming the outer surface layer by coating at various temperatures of 120 ° C., 120 ° C., 140 ° C., and 160 ° C.

[0012] Further, up to the braiding of the polyester fiber constituting the reinforcing layer, it is manufactured in exactly the same manner as above, and then a moisture-curable adhesive is applied on the reinforcing layer by the conventional manufacturing method, and after aging for 48 hours, thermoplasticity is applied. A high pressure hose having an adhesive layer 4 as shown in FIG. 4 was manufactured by extruding a resin and coating the outer surface layer. These eight types of hoses were subjected to hose performance tests such as adhesive strength, bending resistance, burst test and fatigue resistance under the following conditions, and the evaluation results are shown in Table 1.
It was shown to.

Adhesive strength It was carried out in accordance with the test conditions of JIS K 6301. When the bending resistant hose was bent into a U shape with a bending radius of 50 mm, the state of the outer surface layer on the inside of the bending was observed, and those having no abnormality were indicated by ◯, and wrinkles were indicated by x.

Burst test The test was carried out in accordance with the test conditions of JIS K 6375, and those with no abnormality are indicated by ◯. Fatigue resistance Carried out in accordance with JIS K 6375 test conditions, impact pressure 1
After addition of 50,000 times, no abnormality was indicated by ◯, and peeling of the outer surface layer was indicated by x.

[0015]

As can be seen from Table 1, the high pressure hoses (Examples 1 to 4) in which the outer surface layer is coated by extruding the resin in a state where the surface temperature of the reinforcing layer is preheated to 100 ° C. or more, use an adhesive. Although it can be continuously manufactured without using it, it shows the same performance as a high-pressure hose (Comparative Example 4) manufactured by using an adhesive of a conventional manufacturing method, and can be sufficiently put into practical use. It was

On the other hand, the high-pressure hoses (Comparative Examples 1 to 3) in which the resin is extruded in a state where the surface temperature of the reinforcing layer is less than 100 ° C. to form the outer surface layer, are more fatigue-resistant than the conventional high-pressure hoses, Performance such as bending resistance was inferior and was not suitable for practical use. <Part 2> The fiber used for the reinforcing layer is changed to aramid fiber (Kevlar manufactured by Toray DuPont), and the surface temperature of the reinforcing layer is 80 ° C, 100 ° C, 120 ° C, 140 ° C, 160.
Six types of high pressure hoses were manufactured by the same method as described above except that the outer surface layer was formed by coating at various temperatures of 180 ° C and 180 ° C. A hose performance test was conducted on these six types of hoses, and the evaluation results are shown in Table 2.

[0018]

As can be seen from Table 2, the high-pressure hoses (Examples 5 to 9) in which the outer surface layer is formed by extruding the resin in a state where the surface temperature of the reinforcing layer is preheated to 100 ° C. or higher, use an adhesive. Although it can be continuously manufactured without using it, it shows the same performance as a high-pressure hose (Comparative Example 4) manufactured by using an adhesive of a conventional manufacturing method, and can be sufficiently put into practical use. It was On the other hand, the surface temperature of the reinforcing layer is 80
The high-pressure hose (Comparative Example 5) in which the resin was extruded in the state of ℃ to coat the outer surface layer was inferior in fatigue resistance, bending resistance, etc. to the conventional high-pressure hose, and was practically used. Was unsuitable.

[0020]

As described above, according to the present invention, there is provided a hose manufacturing method in which an outer surface layer made of a thermoplastic resin is laminated outside a fiber reinforced layer having an inner surface layer made of a thermoplastic resin laminated therein. In laminating the outer surface layer of the thermoplastic resin, the surface temperature of the fiber reinforcement layer is preheated to a temperature not lower than the softening point of the outer surface thermoplastic resin, and the thermoplastic resin in a molten state is formed on the surface of the preheated fiber reinforcement layer. Since the resin is directly coated and molded, the reinforcing layer and the outer surface layer can be firmly bonded without using an adhesive, so that the hose can be continuously manufactured on a series of manufacturing lines. By enabling continuous production in this way, work-in-progress products are reduced, storage space is not required, and manufacturing costs can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a hose molding manufactured by the method of the present invention.

FIG. 2 is a front view showing a hose manufacturing apparatus according to an embodiment of the present invention.

FIG. 3 is a side view showing the resin extruder of FIG.

FIG. 4 is a perspective view showing a hose molding manufactured by a conventional method.

[Explanation of sign]

DESCRIPTION OF SYMBOLS 1 Hose molded body 11 Heating device 2 Inner surface layer 12 Surface temperature measuring machine 3 Reinforcing layer 13 Cooling device 4 Adhesive layer 14 Pulling machine 5 Outer surface layer 15 Hopper 10 Resin extruder

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Claims (1)

[Claims] 1. A method for producing a hose, wherein an outer surface layer made of a thermoplastic resin is laminated on the outer side of a fiber reinforced layer having an inner surface layer made of a thermoplastic resin laminated on the inner side thereof. A method for producing a hose, in which the surface temperature of the fiber reinforcing layer is preheated to a temperature not lower than the softening point of the outer layer thermoplastic resin, and the surface of the preheated fiber reinforcing layer is directly coated with the molten thermoplastic resin.