Stock material or miscellaneous articles – Sheets or webs edge spliced or joined
Patent
1994-05-31
1998-12-22
Weisberger, Richard
Stock material or miscellaneous articles
Sheets or webs edge spliced or joined
428 347, 428 369, 156173, 156174, 156175, 156177, 156189, 156190, 156191, 156195, 156255, 156446, B29C 6714, B32B 300
Patent
active
058516190
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hollow laminated molded article composed of a fiber-reinforced thermoplastic resin and a method for producing it.
BACKGROUND ART
In the prior art, a molded article made of resin is mainly formed by laminating fiber-reinforced low molecular weight thermosetting resin plates and heating and molding them.
However, the thermosetting resin has a low molecular weight, so that there is such a problem that the resin generates odors such as a styrene monomer odor in the case of an unsaturated polyester resin and an amine odor in the case of an epoxy resin during production operation, and adverse effects are exerted on human bodies.
In addition, also during the lamination, the resin is not integrated with reinforcing fibers, so that they are apt to deviate during the molding, and wrinkles are apt to occur. Thus, a considerable degree of technical skill is required for the molding, and a considerable period of time is also required for curing of a molded article, so that there are such problems that such a molding apparatus becomes extremely expensive, and production cost also increases.
Thus, production of molded articles has been tried using fiber-reinforced resin plates including thermoplastic resins which can be relatively easily handled.
As an illustration of molding using the thermoplastic, in addition to the method described in an official gazette of Japanese Patent Laid-open Application No. 1-286823 entitled "Continuous shaping method and its apparatus for fiber-reinforced resin molded articles", there is generally known a method in which fiber-reinforced resin plates are heated and softened followed by pressurizing and molding at a high pressure in a mold using a pressing machine, that is a press molding method in which a predetermined number of the fiber-reinforced resin plates are laminated on a surface of a male mold or a female mold, the molds are closed to perform pressurizing while heating them to not less than a temperature capable of fluidization of the resin, followed by cooling to not more than a melting temperature of the resin and performing mold release, and an autoclave molding method in which laminated fiber-reinforced resin plates are introduced into a mold, they are heated to not less than a temperature capable of fluidization under vacuum to perform shaping and deaeration, and thereafter the temperature in the mold is lowered to room temperature to perform mold release and the like.
In these methods, generally it is possible to produce a shell-shaped molded article such as for example one having a box shape, a dish shape and the like in which a cross-sectional shape of the molded article is an open curve, however, it is impossible to produce a hollow and cylindrical molded article in which a cross-section is a closed curve.
As a method for producing such a hollow and cylindrical molded article, there is a method in which a laminated article of fiber-reinforced resin plates is prepared in which a resin is melted and is wound around a core mold to perform molding, the resin is introduced into a mold together with the core mold, and is pressurized while heating using a pressing machine or under vacuum, followed by cooling to take out the molded article, and the core mold is withdrawn.
However, a high degree of technical skill is required for winding the laminated article around the core mold so as not to make wrinkles and sagging, and a long period of time is required for the steps of heating while performing the pressurizing followed by the cooling, so that the problem is such that production cost becomes expensive.
Thus, generally the hollow and cylindrical molded article is produced in such a manner that it is divided into a plurality of parts to perform molding, they are assembled to provide a hollow and cylindrical body, and their side edges are mutually joined using bolts and nuts or an adhesive, or their joining faces are heated to obtain adhesion under pressure.
However, in such a method, it is necessary that a plurality of parts a
REFERENCES:
patent: 4990207 (1991-02-01), Sakai et al.
patent: 4992127 (1991-02-01), Kishi et al.
patent: 5071687 (1991-12-01), Shigetoh
patent: 5201979 (1993-04-01), Koba et al.
patent: 5294394 (1994-03-01), Sakai et al.
patent: 5445701 (1995-08-01), Koba et al.
patent: 5514448 (1996-05-01), Kishi et al.
patent: 5532054 (1996-07-01), Koba et al.
Handbook of Polymer Composites, Section 3.4, J Barnes Continuous Fibre Reinforced Thermoplastic Composites pp. 145-149.
Hosoyama Nobuyuki
Kishi Satoru
Morita Katsuyuki
Motai Kojiro
Sakai Hideo
Mitsui Chemicals Inc.
Weisberger Richard
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