Process for producing resin hose

Details Process for producing resin hose Process for producing resin hose

1994-06-13

1997-11-04

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264267, 264259, 264314, 425127, 4251291, 425525, B29C 4920

Patent

active

056836473

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a process for producing a resin hose which is optimum for producing air duct hoses, filler hoses or the like for automobiles.


BACKGROUND ART

In a field of hoses, for instance, air duct hoses, filler hoses or the like for automobiles, it has been tried to replace rubber hoses with hoses made of resin recently. Some of the rein hoses have been put into actual applications.
The resin hoses have advantages in that they have light specific gravities compared to those of the rubber hoses, they can be lightweighted, they can make an integrally formed product comprising soft portions and hard portions, and they allow a high degree of freedom in designing the configurations or the like.
In the resin hoses, hard resinous materials are used for portions which require hardness, and soft resinous materials are used for portions which require softness. When forming the hoses, the hard and the soft portions can be formed integrally with the two materials, e.g., the hard and the soft resinous materials. However, in the rubber hoses, it is difficult to constitute the hard and the soft portions with an integrally formed product. Usually, in the rubber hoses, metallic pipes make the portions which require hardness, rubber hoses make the other portions which require softness and flexibility, and they are assembled together.
In the resin hoses, the soft and the hard portions can be made with the integrally formed product. Hence, the number of the component parts can be decreased, and the production costs can be reduced.
In the resin hoses, the phrase, "the high degree of freedom in designing the configurations or the like," means that the hose are limited less configurationally because they fully resist negative pressures. On the other hand, in the rubber hoses, when the rubber hoses are formed in a flattened shape in cross-section at a portion thereof and they are subjected to negative pressure, they are likely to deform at the portion. Consequently, compared to the resin hoses, the rubber hoses allow a lower degree of freedom in designing the configurations or the like.
By the way, in the resin hoses, blow molding processes are employed preferably as a process for forming the resin hoses. In the blow molding processes, a tubular or bag-shaped parison is usually expanded by blowing air thereinto, and it is adhered to inner surfaces of a forming mold, thereby being formed into a predetermined configuration. Accordingly, the outer surfaces of the formed products can be formed into predetermined shapes accurately with the forming mold. However, the inner surfaces of the formed products are not formed with the mold surfaces, but they are formed in the free states. Hence, the inner surfaces are inevitably inferior in terms of the configurations and the dimensional accuracy.
However, the hoses are usually connected by fitting a mating member, e.g., a metallic pipe or the like, into the inside of them at the end which usually makes the connecting portion, and at the same time it is necessary to securely provide a sealing property at the connecting portion. If such is the case, when the inner surfaces of the connecting portion of the hoses are inferior in terms of the configurations and the dimensional accuracy, for example, when the hoses have fluctuating inside diameter dimensions or thickness, uneven thickness and convexities and concavities on the inner surfaces, the sealing property cannot be fully secured at the connecting portion between the hoses and the mating member.
Therefore, in the resin hoses made by the above-described blow molding processes, the inner surfaces of the connecting portion are finished to predetermined shapes and dimensions by grinding.
However, when the grinding is carried out onto the hoses, not only the number of the hose production processes increases, but also there remain ground chips at the processed portions and the peripheries. Consequently, it is necessary to employ a washing process for removing the ground chips, thereby further increasing th

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patent: 3047910 (1962-08-01), Downs
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patent: 5266262 (1993-11-01), Narayama et al.
patent: 5445782 (1995-08-01), Sadr
Patent Abstracts of Japan, vol. 12 No. 149, May 10, 1988 JP-A-62 270315 (Toyo Seikan Kaisha Ltd).

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