Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Measuring – testing – or inspecting
Patent
1996-05-28
1998-09-22
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Measuring, testing, or inspecting
156 64, 156166, 156180, 156441, 264 401, 264137, 425 93, 425500, B29C 5902
Patent
active
058110518
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to method and apparatus for continuous draw-molding a concrete reinforcing member, particularly a fiber reinforced plastic (FRP) rod formed with a spiral groove.
BACKGROUND ART
In recent years, there has arisen a problem with steel members used as concrete reinforcing members such that the steel members corrode by being exposed to salinity contained in sea sand mixed in concrete material or to salinity at a time when the concrete cracks under a severe salinity condition. In view of such problem, there is a tendency to use an FRP rod as a reinforced member which is in superior in its corrosion proof property in substitution for the steel member. It is necessary for the FRP rod like the steel member to make strong a binding force to the concrete, and as one method therefor, grooves are formed to the circumferential surface of the FRP-made reinforcing member, and there is provided a draw-molding method, as one of FRP-made reinforcing member molding methods, in which fiber is moved in a longitudinal direction of the member.
For example, there are known Japanese Patent Publication No. SHO 57-18484, Japanese Patent Laid-open Publication No. HEI 3-33045, Japanese Patent Laid-open Publication No. HEI 4-12828, and Japanese Patent Laid-open Publication No. HEI 5-124116 which disclose methods and apparatus for draw-molding FRP rods formed with spiral grooves.
In these prior art documents, the apparatus disclosed in the Japanese Patent Publication No. SHO 57-18484 is represented by a structure shown in FIG. 1, in which glass fibers c impregnated with thermosetting resin b are arranged in parallel under tension on a surface of a mandrel a and the glass fibers c are then passed through a heating mold d to form them in a semi-hardened state as glass fiber reinforced resin material g. In the next step, a metal wire filament e having a surface which is coated or covered by a mold releasing agent is continuously wound up around the surface of the glass fiber reinforced material in a spiral fashion, and thereafter, it is heat hardened in a heating furnace f. Finally, by removing the metal wire filament e from the surface of the glass fiber reinforced material g, the spiral groove h is formed on the surface thereof.
Further, in these prior art documents, the apparatus disclosed in the Japanese Patent Laid-open Publication No. HEI 3-33045 is represented by a structure shown in FIG. 2, in which a wire-like fiber base material c' is impregnated with a thermosetting resin b, and then, the fiber base material c' is passed through a preform mold i' to make the resin to a unhardened or semi-hardened state. Thereafter, a wire filament e' having tenacity is wound up around the surface of the fiber base material c' in a spiral fashion with a predetermined space, and a heat-resisting tape j is also wound up in a spiral fashion around the surface of the fiber base material c' so as to cover a surface portion not covered by the wire filament e'. Under this condition, the fiber material base c' is heat hardened in a heating furnace f, and finally, the wire filament e' and the heat-resisting tape j are removed from the surface thereof to thereby form a spiral groove h thereon.
Furthermore, in these prior art documents, the apparatus disclosed in the Japanese Patent Laid-open Publication No. HEI 4-12828 or NO. HEI 5-124116 is represented by a structure shown in FIG. 3, in which a belt-shaped material m is wound up around an FRP rod k before hardening and then is hardened in a heating furnace f. Thereafter, a spiral groove h is formed by removing the belt-shaped material m.
However, the methods and apparatus for continuous draw-molding the spiral grooved FRP rods in the prior arts described above involve the following problems.
First, according to the structure of the apparatus disclosed in the Japanese Patent Publication No. SHO 57-18484, the glass fibers c impregnated with the thermosetting resin b are semi-hardened and, in the next step, the metal wire filament e for forming the spiral groo
REFERENCES:
patent: 3108921 (1963-10-01), Gillman et al.
patent: 4770832 (1988-09-01), Okamoto et al.
Abekawa Toshiharu
Akimoto Haruhito
Hosokawa Junji
Kikuchi Masao
Ozawa Nobuyuki
Kananen Ronald P.
Komatsu Ltd.
Komatsu Plastics Industry Co., Ltd.
Tentoni Leo B.
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