Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1996-02-14
1998-08-11
Jagannathan, Vasu
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
523348, 524492, 524493, 524494, 428902, B29D 2200, B29D 2300
Patent
active
057925275
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a product in a continuous length (hereinafter sometimes referred to as a "continuous-length product") formed from a resin reinforced with a fiber reinforcement, a process for preparing the same and uses of the same. More particularly, the invention relates to a fiber-reinforced continuous-length product in a specific shape and excellent in tensile strength, which is formed from a reinforced resin composition comprising a resin matrix of a thermoplastic resin (e.g., a crystalline polyolefin resin, a polyamide resin (nylon) or a specific composition of both resins) or a thermosetting resin as a base resin, and a fiber reinforcement, particularly a glass fiber reinforcement. The invention also relates to a process for preparing the continuous-length products.
Moreover, the invention relates to a spacer in a continuous length capable of keeping opposite panels of a concrete form at a given distance when fit inside the panels and capable of maintaining the given distance while withstanding great tensile stress applied during the setting period of the concrete placed between the panels.
BACKGROUND ART
For forming a structure of prescribed shape from cement plaster, cement, concrete, etc. (sometimes referred to as "concrete or the like" hereinafter), generally adopted is such a technique that a concrete form surrounding a space of shape corresponding to the housing of the structure is set up and concrete or the like is placed in the space. In this technique, plates (form panels) made of steel, light metal, wood or plastic (resin) are used to build the form.
In the form built of the form panels, it is required that not only the adjacent form panels are fixed to each other at their corners, side edges or ridges, but also the opposite form panels are fixed at plural positions with a spacer, in order to keep the panels, which face each other via the space for placing the concrete therein, at a given distance. The reason is that the action of the concrete or the like placed in the spacer to push the form outward cannot be restrained only by fixing the form panels at their corners, side edges or ridges. The concrete or the like is a heavy fluid before setting, and it is swollen hen set. Therefore, the force of the concrete or the like to push the form outward is very great. To withstand the strong outward force, the spacer needs to have high tensile strength, but its own weight is desired to be small.
It is, therefore, an object of the invention to provide a continuous-length product which is reinforced with a fiber material, thereby exhibiting high tensile strength, particularly to provide a spacer which is useful for concrete forms and satisfies such two requirements that the spacer sufficiently withstands the outwardly strong tensile stress and the spacer's own weight is as light as possible and the amount of the material used for the spacer is as small as possible.
DISCLOSURE OF THE INVENTION
The continuous-length product according to the present invention is characterized in that the continuous-length product is formed from a fiber-reinforced resin comprising a fiber reinforcement and a resin matrix (Lmm)/real area of the section (Smm.sup.2)! of 0.5 to 2.5/mm, preferably 0.55 to 2.2/mm, and a thickness of 1 to 4 mm, preferably 1.5 to 3.5 mm.
The continuous-length products of the invention may be in any shape satisfying the above-defined shape ratio, and its sectional shape is, for example, X shape (+shape), H shape, shape, * shape, circular ring shape or polygonal ring shape.
In the continuous-length products of the invention, the fiber reinforcement is preferably dispersed and contained in the resin matrix in such a manner that the fiber reinforcement is arranged substantially in parallel with the major axis of the continuous-length product in at least the surface portion (layer) of the continuous-length products.
The fiber reinforcement used in the invention has a mean fiber length of preferably 0.3 to 30 mm, more preferably 3 to 30 mm. The fiber reinforcem
REFERENCES:
patent: 4613647 (1986-09-01), Yonaiyama et al.
patent: 5133316 (1992-07-01), Kasai et al.
patent: 5238989 (1993-08-01), Takei et al.
patent: 5264174 (1993-11-01), Takei et al.
Atsumi Nobukazu
Yonaiyama Rikio
Yoshimitsu Minoru
Chisso Corporation
Jagannathan Vasu
Rajguru U. K.
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