JPH0557732A - Manufacture of preformed resin composite hose - Google Patents

Abstract

PURPOSE:To provide a preformed resin composite hose not generating wrinkles and the release of a resin layer capable of preventing transmission even if used as a cooling medium transport hose of fuel or Freon. CONSTITUTION:After a thin resin layer 2 is formed to the outer peripheral surface of a resin mandrel 1 having flexibility, a first rubber inner layer 3 is extruded to be applied to the outer peripheral surface of the resin layer 2 to be vulcanized. After a second rubber inner layer 4 is extruded to be applied to the outer peripheral surface of the first vulcanized rubber inner layer 3, a rubber outer layer 6 is extruded to be applied to the outer peripheral surface of the second rubber inner layer 4 through a reinforcing layer 5 to form a resin composite hose 7. Next, the resin composite hose 7 containing the resin mandrel 1 is set to a preforming jig 8 and vulcanized in a state bent into a desired shape and the resin mandrel 1 is removed from the vulcanized resin composite hose.

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 preformed resin composite hose which is piped in, for example, an engine room of an automobile and is used as a refrigerant pipe of a car air conditioner and a radiator hose.

[0002]

2. Description of the Related Art In a car air conditioner, a compressor, a condenser, and an evaporator are connected by a hose, and piping is arranged so that a refrigerant such as freon gas can circulate.
Since this hose circulates a high-temperature and high-pressure refrigerant, it must be made of a material having excellent durability, corrosion resistance, and heat resistance.

In addition, due to recent global environmental protection problems, it is required to form a low permeability so that a refrigerant such as fuel or freon gas does not permeate, and a resin composite hose tends to be used for the purpose of preventing permeation.

On the other hand, since the engine room of an automobile is narrow and the hose piping space is limited, a bent rubber hose of a predetermined length is manufactured, and both ends of the bent hose are connected to the compressor, condenser and It is connected to equipment such as an evaporator.

By the way, conventionally, in order to manufacture a bent hose, after forming an unvulcanized hose on the outer peripheral surface of the mandrel, the mandrel is decoreed from the unvulcanized hose and cut into an appropriate length. Next, there is known a method for manufacturing a hose in which a bent mandrel is inserted into the unvulcanized hose and then vulcanized to be preformed.

Further, as known from Japanese Patent Application Laid-Open No. 2-227216, for example, a plastically deformable metal wire is inserted into a hollow mandrel made of flexible resin or rubber in a non-adhesive state, and the mandrel is straightened. And insert it into an unvulcanized rubber hose.

Next, the entire rubber hose is bent into a predetermined shape, vulcanized and molded, and then the entire mandrel is stretched linearly to pull out the mandrel from the vulcanized rubber hose.

[0008]

However, when the resin composite hose is manufactured in the same manner as the method for manufacturing the bent hose described above in order to prevent the permeation of the refrigerant such as the fuel and the Freon gas, the difference in the heat shrinkage between the resin layer and the rubber layer is generated. Causes flatness, wrinkles and peeling of the resin layer, especially when peeling of the resin layer occurs,
Refrigerants such as fuel and freon gas permeate and the desired hose cannot be manufactured.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent permeation of a refrigerant such as fuel or freon gas without causing flatness, wrinkles and peeling of a resin layer on the inner surface. (EN) Provided is a method of manufacturing a preformed resin composite hose.

[0010]

In order to achieve the above-mentioned object, the present invention manufactures a preform resin composite hose according to the following process sequence. (1) A thin film resin layer is formed on the outer peripheral surface of a flexible resin mandrel. (2) The outer peripheral surface of the thin film resin layer is extruded and coated with the first rubber inner layer, and then vulcanized. (3) The outer peripheral surface of the vulcanized first rubber inner layer is extruded and coated with the second rubber inner layer. (4) An outer rubber layer is extruded and coated on the outer peripheral surface of the second inner rubber layer through a reinforcing layer to form a resin composite hose. (5) The resin composite hose together with the resin mandrel is set on a preform jig, and the resin composite hose is vulcanized while being bent into a desired shape. (6) Decore the resin mandrel from the vulcanized resin composite hose.

[0011]

The thin resin layer is formed on the outer peripheral surface of the flexible resin mandrel, and the outer peripheral surface of the thin resin layer is extruded and coated with the first rubber inner layer, so that the inner surface of the resin composite hose becomes the thin resin layer. The thin film resin layer may be selected depending on the fluid flowing through the inside, and in the case of a refrigerant such as Freon gas, a nylon resin is desirable.

By using EPDM / polymethylpentene as the material of the resin mandrel, the decoking property when decoreing the resin mandrel is good, and wrinkles and resin layer peeling can be prevented, and at the same time, the resin mandrel can be prevented. Can be reused.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show the sequence of manufacturing a preformed resin composite hose. The resin mandrel 1 is shown in FIG.
As the material, polymethylpentene is preferably a round rod body in consideration of decoreability and reusability.

As shown in FIG. 1, a thin film resin layer 2 having a wall thickness of 50 to 300 μm is formed on the outer peripheral surface of the mandrel 1 by an extruder. The thin film resin layer 2 may be selected depending on the fluid flowing through the inside, and in the case of a refrigerant such as Freon gas, a nylon resin is desirable.

An adhesive capable of vulcanization adhesion is applied to the outer peripheral surface of the thin film resin layer 2, and rubber is extruded on the outer peripheral surface by an extruder to form the first rubber inner layer 3. This first
The rubber inner layer 3 is preferably NBR, EPDM, IIR or the like, for example. After extruding the first rubber inner layer 3, the polymethylpentene resin is extruded to coat the first rubber inner layer 3 and then primary vulcanization is performed. During vulcanization, it is difficult to soften and a tightening force is generated, and the first rubber inner layer 3 and the thin film resin layer 2 are vulcanized and bonded.

After the primary vulcanization, the polymethylpentene resin on the outer peripheral surface of the first rubber inner layer 3 is peeled off, pulverized and reused.
Next, a vulcanizing adhesive is applied to the outer peripheral surface of the first vulcanized first rubber inner layer 3 and dried.

Next, as shown in FIG. 2, the first rubber inner layer 3
A second rubber inner layer 4 is formed by extruding rubber with an extruder on the outer peripheral surface of, i.e., the surface coated with the vulcanizing adhesive.
As the second rubber inner layer 4, for example, NBR, EPD
M, CSM, IIR and the like are preferable.

On the outer peripheral surface of the second rubber inner layer 4, a reinforcing layer 5 made of a blade of RFL treated yarn such as polyester or vinylon is formed, and rubber is extruded on the outer peripheral surface of the reinforcing layer 5 by an extruder. The rubber outer layer 6 is formed. Examples of the rubber outer layer 6 include EPDM, CSM, II
R and the like, or blends thereof, are preferred.

After forming the thin film resin layer 2 on the mandrel 1 in this manner, the first rubber inner layer 3, the second rubber inner layer 4,
After forming the reinforcing layer 5 and the rubber outer layer 6 in this order, by decentering the mandrel 1, as shown in FIG.
A long and unvulcanized resin composite hose 7 is obtained.

Next, the resin composite hose 7 is cut into a desired length together with the resin mandrel 1 and set on a bent preform jig 8 as shown in FIG. In this preform jig 8, a bending groove 11 is formed by a base 9 and two bending plates 10 provided upright on the upper surface of the base 9.

Therefore, the resin composite hose 7 including the resin mandrel 1 is attached to the bending groove 1 of the preforming jig 8.
1, the resin composite hose 7 is bent along the bending shape of the bending groove 11 of the preforming jig 8,
This is vulcanized by hot air vulcanization (HAV).

In this case, since the inner diameter of the thin-film resin layer 2 on the inner surface of the resin composite hose 7 is the same as the outer diameter of the resin mandrel 1, it is possible to prevent flatness and wrinkles during bending, and thus the thin-film resin layer 2
Peeling can be prevented.

After vulcanization, the vulcanized resin composite hose 12 is taken out from the preform jig 8 and the resin mandrel 1 is decoreed. Since the resin composite hose 12 after vulcanization has high elasticity, the resin mandrel 1 can be easily pulled out, and the resin composite hose 12 after decoreing restores to the preform shape. Further, the resin mandrel 1 after decoreing can be regenerated by crushing and extruding, which is economical.

In the above embodiment, the step of applying the vulcanizing adhesive to the outer peripheral surface of the first vulcanized first rubber inner layer 3 and drying it is provided. If the rubber inner layer 4 has good vulcanization adhesion, this step may be omitted.

As the second rubber inner layer 4, for example, N
BR, EPDM, CSM, IIR, etc. are used,
The materials of the first rubber inner layer 3 and the second rubber inner layer 4 may be changed in consideration of the fitting property of the joint fitting, water permeability, heat resistance, vibration transmissibility, and the like.

[0027]

As described above, according to the present invention, the thin film resin layer is formed on the outer peripheral surface of the flexible resin mandrel, and the outer peripheral surface of the thin film resin layer is extruded and covered with the rubber inner layer. Therefore, the inner surface of the resin composite hose becomes a thin film resin layer, and wrinkles and peeling of the resin layer do not occur, and permeation can be prevented even when used as a refrigerant transportation hose for fuel, freon gas, or the like. Further, the preformed resin composite hose has an effect that it can be easily mounted even in a piping space such as a narrow engine room.

Further, by adopting a resin mandrel, it is economical because the resin mandrel after core removal can be regenerated by crushing and extruding.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state where a thin film resin layer and a first rubber inner layer are formed on a resin mandrel by a method for producing a resin composite hose according to an embodiment of the present invention.

FIG. 2 is a view showing a manufacturing method according to the same embodiment, in which a second rubber is formed on a first rubber inner layer
FIG. 3 is a perspective view showing a state where an inner rubber layer, a reinforcing layer and an outer rubber layer are formed.

FIG. 3 is a perspective view of an unvulcanized resin composite hose obtained by the manufacturing method according to the embodiment.

FIG. 4 is a perspective view showing a state where an unvulcanized resin composite hose is set in a preform jig by the manufacturing method according to the embodiment.

FIG. 5 is a perspective view showing a state where a resin mandrel is decoreed from a resin composite hose after vulcanization by the manufacturing method according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Resin mandrel, 2 ... Thin film resin layer, 3 ... 1st rubber inner layer, 4 ... 2nd rubber inner layer, 5 ... Reinforcing layer, 6 ... Rubber outer layer, 7
... Unvulcanized resin composite hose, 8 ... Jig for preform.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location B29K 105: 06 105: 24 B29L 9:00 4F 23:22 4F

Claims (1)

[Claims] 1. A first step of forming a thin film resin layer on the outer peripheral surface of a flexible resin mandrel, and a step of vulcanizing after extruding and coating a first rubber inner layer on the outer peripheral surface of the thin film resin layer. Step 2, a third step of extruding and covering the outer peripheral surface of the vulcanized first rubber inner layer with a second rubber inner layer, and extruding and covering an outer peripheral surface of the second rubber inner layer with a reinforcing layer through a reinforcing layer To form a resin composite hose, and a fifth step of setting the resin composite hose together with the resin mandrel on a preform jig and vulcanizing the resin composite hose in a bent state into a desired shape. A method for producing a preformed resin composite hose, which comprises a sixth step of decoreing the resin mandrel from the already used resin composite hose.