Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-03-21
1998-02-24
Choi, Kathleen
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 365, 428 3692, 156184, 156242, 264267, 264241, 264257, 210504, B01D 2911, D32B 108, B29D 900, B29D 2200
Patent
active
057210314
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/SP94/01194 filed Jul. 20, 1994.
TECHNICAL FIELD
The present invention relates to a porous plastic tube which has continuous pores in the tube wall, high mechanical strength, and smooth external and internal surfaces.
BACKGROUND OF THE INVENTION
A porous plastic tube has been used as structural materials for architecture and construction, because it has merits that the consumption of the plastics can be minimized, and the rigidity of the tube can be improved by increasing the thickness of the tube wall owing to the existence of the continuous pores in the tube wall.
Further, it has been used as a filter material, a diffusing tube and the like utilizing the continuous pores.
A sinter-forming process using resinous powders as a raw material has been known as a method of producing such a porous plastic tube as described in KOGYO ZAIRYO, Vol. 32, No.4.
According to the conventional sinter-forming process, a porous plastic tube has been made by filling the resin powders into a double-cylindrical mold, and heating it near the melting point of the resin so as to only adhere the surface of the resin powders, and then removing the product from the mold.
The porous tube obtained by the above process, however, is low in strength because the resin powder is only melt-adhered on the points of surface of the powders.
Further, there is a problem that the continuous porosity can be obtained at most about 50% by volume.
In the meanwhile, porous plastic tubes have been known, which were formed in the shape of a pipe with fibers alone using thermo-adhesive composite fibers without any binder such as an adhesive agent at all, but such tubes are usually made by steps of filling webs containing thermo-adhesive composite fibers between the an outer cylinder and an inner cylinder of a combination mold, subjecting them to heat, cooling, and then removing them from the mold.
This method, however, includes problems that the length of the mold is limitative because the fibers are filled from one end of the mold, and the thickness thereof is also limitative because the whole of the mold should be heated, so that only a small tube can be produced, and the strength against compression is low.
Japanese Patent Application KOKOKU 56-43139 discloses a process of production of a hollow cylindrical fiber molded product in which a fiber layer of a given width containing thermo-adhesive composite fibers is wound on a core as reducing the bulkiness and elasticity as pressed by the dead load of the wound fibers to provide a given porosity, and then cooled, and after that the core is taken out from the wound fiber in order to improve the above defects. This process has merits that according to the method described therein a hollow cylinder having any desirable size can be prepared, and even a small size one can be efficiently produced by cutting one which has the same shape but a longer size, and the porosity can be freely controlled within 50-90% by volume. But, the problems have not been solved that they are porous plastic tubes formed in a pipe shape and made of fibers having a small tensile modulus, and have a small bulk density and a small compressive strength in general.
As apparent from the above, the objects of the present invention are first to provide a fiber-reinforced porous plastic tube having a high compression strength and a large continuous porosity, and secondly to provide a method of producing the aforementioned fiber-reinforced porous plastic tube using a composite sheet obtained from matrix resins and fibers for reinforcement.
DISCLOSURE OF THE INVENTION
As the results of our study to solve the above problems, it has been found that a porous plastic tube which has continuous pores and is reinforced with high modulus fibers exhibits a high mechanical strength, and the continuous porosity can be optionally controlled by selecting the conditions for the production.
The first feature of the present invention is a fiber-reinforced porous plastic tube having continuous pores which comprises a
REFERENCES:
patent: 3767054 (1973-10-01), Farrow et al.
patent: 4339334 (1982-07-01), Eguchi et al.
patent: 4376675 (1983-03-01), Perrotta
patent: 4523995 (1985-06-01), Pall et a.
patent: 4973382 (1990-11-01), Kinn et al.
patent: 5264162 (1993-11-01), Salem et al.
patent: 5529844 (1996-06-01), Degen et al.
English Translated Copy of FR 2 396 231.
Echigo Yoshiaki
Iwaya Yoshiaki
Nakanishi Kiyotaka
Choi Kathleen
Unitika Ltd.
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