JPS60229741A - Manufacture of expanded long fiber-reinforced synthetic resin for scaffold plate - Google Patents

Abstract

PURPOSE:To integrally form many projection on the surface of a molding by inserting a belt with many holes between the inner surface of a path for molding and continuous long fiber bundles. CONSTITUTION:When the bundle of continuous long fibers is impregnated with an expansible resin liquid and directed to a molding path 4, a belt 5 with many holes, a synthetic resin film 6, and a latticed reinforcement 7 are inserted from an endless belt 41 side. They are sent into a heating furnace 8 under guidance of a guide roll 42, where the expansion and hardening of the expansible resin are accelerated and the resin liquid enters the holes of the belt 5 through the film 6 to form many projections integrally on the surface of the molding 10. The molding is then taken by a takeoff unit 9 and the film 6 is peeled off.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a method for producing a long fiber reinforced synthetic resin foam for scaffolding boards used for workers to walk on sites such as construction, civil engineering, and shipbuilding. be.

(Prior art and its drawbacks) Recently, lightweight,
fi! is made of synthetic resin foam reinforced with long glass fibers for excellent water resistance. 4& is proposed.

For example, Japanese Patent Application Laid-open No. 5
As described in Japanese Patent No. 3-58570, a manufacturing method is provided in which a long fiber bundle impregnated with a resin liquid is continuously introduced into a molding passage and foamed and hardened therein. There is. However, materials manufactured by such a method tend to crack along the filament direction, and have the disadvantage that they are not sufficiently safe when used as scaffolding boards.

It is also known to manufacture a sandwich structure by using a synthetic resin foam as a core and covering the core with an FRP board as a surface material, but such a manufacturing method complicates the manufacturing process and is not economical. Furthermore, it is difficult to continuously manufacture elongated bodies.

In addition, in any of the above methods, the surface of the molded body is ground after it is manufactured in order to ensure that the surface obtained is smooth and provides the anti-slip effect required as a function of the scaffolding board. It has to be busy with unevenness, and post-processing takes time, making it less economical.

(Purpose) In view of the above-mentioned drawbacks, the present invention provides a long fiber-reinforced glue for scaffolding boards that has excellent mechanical strength and bending strength in the width direction, and has a large number of anti-slip protrusions on the surface. A method for continuously manufacturing resin foam is provided.

(Structure) The gist of the present invention is to guide a continuous filament bundle impregnated with a foamable resin liquid that can be foamed and hardened in a short time into a molding passage composed of an endless belt, and in which the resin is When producing a long fiber-reinforced synthetic resin foam by foaming and curing the liquid, the continuous long fiber bundle is sandwiched from the entrance of the molding passage to the inner surface of the upper or lower part of the molding passage. A large number of holes were sequentially drilled from the endless belt side of the molding passage as shown in FIG. The present invention relates to a method for producing a long fiber-reinforced synthetic resin foam for scaffolding boards, characterized by completing foaming and curing of the foam.

In the process of wood invention, a foaming # that can be foamed and hardened in a short time is used as a fat liquid, but this resin liquid is initially liquid and then hardens due to heating or the presence of a hardening agent. It has the property of foaming, and an appropriate curing agent or curing accelerator for curing, a reactive foaming agent, a thermally decomposable foaming agent, etc. may be added for foaming. Examples of the resin liquid suitable for use in the present invention include polyurethane, epoxy resin, and phenol resin.

Furthermore, a continuous long fiber bundle is a collection of many uncut long fibers arranged in one direction, and the fibers used for this are inorganic fibers such as glass fibers and carbon fibers. It may also be an organic fiber made from synthetic resin such as polyamide, polyester, or polyolefin, or a natural fiber such as cotton, hemp, or wool. Further, the fiber may be a single fiber or a plurality of fibers twisted together. When the long fiber reinforced foam obtained according to the present invention is used as a scaffold board, it is preferable to use long glass fibers as the fibers from the viewpoint of cost and physical properties.

Next, the forming path used in the present invention is composed of endless belts, and the forming path is formed so that the space surrounded by the plurality of endless belts arranged parallel to each other forms the outline of the desired product. It is what was done. The endless belt is preferably supported by a roller bearing or a cylindrical body to prevent it from bending in a direction perpendicular to the direction of travel due to the expansion force of the foamable resin liquid when it is foamed and hardened.

Next, in the present invention, a belt with a large number of holes is used, and the belt is made of a long fiber reinforced base r! (i) This is to integrally form a large number of protrusions that provide an anti-slip effect on the surface of the resin foam, and when the foaming resin liquid is foamed, it pushes up the synthetic resin film described below, creating a large number of pores. It crawls into the inside and a large number of protrusions are formed. During the period when the continuous filament bundle passes through the forming passage, the belt is constructed of an upper or lower part forming the forming passage, and an interlocking mechanism between the upper and lower endless belts and the synthetic resin film described below. Since the belt is interposed, it is preferable that a belt-like belt is made into a loop like the endless belt and placed around the endless belt so that it moves along the forming path together with the endless belt. . There are no particular restrictions on the material of the belt, but if a large number of holes are to be drilled, it is best to use metal such as henching metal.

The thickness of the belt, the size and shape of the holes, etc. may be determined depending on the size and shape of the projections to be provided.

Next, the lattice-like reinforcing material is melted to form a plurality of short weft threads parallel to each other, and a plurality of long warp threads glued to the surface of the weft threads at predetermined intervals in a direction perpendicular to the ζ threads in a lattice pattern. The commonly used materials for the weft and warp yarns include glass fibers, metal fibers, synthetic fibers, etc. Among these, glass fibers are preferred. The weft yarn and the warp yarn may be made of different materials. The thickness of the weft and warp yarns, for example, in the case of glass Mk#, it is best to bundle 200 to 800 single fibers with a diameter of 4 to 10μ to make a strand, and the number of weft and warp yarns can be adjusted as in the case of lattice reinforcement. It is recommended that the distance between the warp yarns and the distance between the warp yarns be 2 to 25 cm.

The above-mentioned lattice-shaped reinforcing material may be made of glass fiber, such as a commercially available product [G 1assFibe manufactured by Nittobo Co., Ltd.].
r Scrim Fabric) can be used.

The lattice-shaped reinforcing material is embedded integrally in the surface layer of the fiber-reinforced synthetic resin foam and has the effect of preventing warp cracks that occur along the long fiber direction, and is limited to the above. For example, short weft yarns may be joined together with vinylon fiber yarn or the like in a sag-like manner.

As the synthetic resin film, films made from ordinary synthetic resins such as polyvinyl chloride and polyolefin may be used, but wood F! In step 4, the film prevents the foamable resin liquid from penetrating through the holes of the belt having a large number of holes during foaming and from adhering the endless belt to the belt having a large number of holes. After foaming and curing, the long fibers are reinforced! Since the main purpose is to improve the releasability between the M resin foam and the belt, it is preferable to use a material that has poor adhesiveness with the foamable resin liquid. In addition, by using a synthetic resin film with embossed processing on the surface, fine irregularities can be formed on the surface of the protrusions that are integrally formed on the surface of the long fiber reinforced synthetic resin foam, further improving the anti-slip effect. do.

Next, the manufacturing method of the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing the steps of an embodiment of the present invention,
In the figure, 1 is a continuous long fiber, and glass fiber was used.

A large number of the long glass fibers 1 are collected by a converging tool 31 and made into fibers, and a foaming resin liquid is sprayed thereon by a resin wI scattering device 2 to impregnate the fibers with the resin liquid to make the impregnation uniform. It is passed through a kneading plate 32 that reciprocates in the direction of the arrow. The continuous long fiber bundle e impregnated with the foamable resin liquid is guided to the shaping passage 4, which is formed by an endless belt 41 formed in a loop shape and a guide roll supporting the endless belt 41. 42.

Note that the forming passage 4 is constituted by an endless belt 41 and a guide roll 42 on both the upper and lower sides and the left and right sides, but the lower part and the cloth part in the drawing are omitted.

5 companiesThis belt had a large number of holes, and punched metal with circular holes was used. *In the implementation SW, the belt 5Fi is made into a loop like the endless belt 41, placed outside the endless belt 41, and made into a trap so as to move together with the endless belt 41.

If five pieces of belt are placed above and below each other, a piece with protrusions on both sides can be obtained.

6 is a synthetic resin film, and a polyvinyl chloride film with an embossed surface was used.

It is a reinforcing material in the form of a lattice, and in this example, a plurality of short weft threads 71, 71... parallel to each other are bonded to the surfaces of the weft threads at predetermined intervals in a direction perpendicular to the weft threads. A yarn made of multiple long warp threads was used.

Then, when the continuous long fiber bundle is guided to the rL type passage 4, a belt is provided with a large number of holes perforated on the 1 endless belt 41 side so as to be sandwiched between the 1 endless belt 41 and the continuous long fiber bundle. 5, synthetic resin film 6, lattice reinforcement material 7
are sequentially inserted from the entrance of the forming passage 40. .

It is a 8Vi heating furnace, and heated air is sent from a heated air supply pipe 71 to promote foaming and curing of the foamable resin liquid. It is a nine-fold pulling device, and by the drive of the device, a continuous long fiber bundle passes through the shape passage 4, and an endless belt 41 and a large number of holes are perforated therein. r! i. When the foamable resin liquid impregnated into the continuous fiber bundle is foamed in the form passage 4 and hardened, a large number of holes are formed in the same way as the endless belt 41 and the synthetic resin film 6 during foaming. As the foaming resin liquid spreads out the synthetic resin film 6 and squeezes into the holes of the belt 5, as shown in FIG. formed in one piece,
The material is taken out from the molding path 4 by a taking-off device 9 and cut into appropriate lengths. In addition, synthetic resin film 6t
It is sufficient to peel it off from the molded body 10 when it exits the take-up device 9.

In this way, the long fiber reinforced VCTLT resin foam produced by the method of the present invention has a lattice-like reinforcing material embedded in the surface layer of the foam, so it has a mechanical strength frame. The bending strength of the Ktc shape in the width direction (in the direction of the arrow in FIG. 2) is excellent. Furthermore, since the protrusions are integrally formed on the surface of the foam, the surface becomes uneven, increasing frictional resistance and causing slippage.

(Effects) The method of the present invention is as described above, in which a belt with a large number of protruding holes is inserted and interposed between the inner surface of the forming passage and the continuous filament bundle. , a layer in which a large number of protrusions are integrally formed is formed on the surface of the lit shape. The frictional resistance is greater than the shape of the protrusion rcK, and the anti-slip effect is improved. Furthermore, since a synthetic resin film is interposed between the belt and the continuous fiber bundle, the molded product has excellent mold releasability after foaming and curing.

Since the reinforcing material in the form of a synthetic resin film and the continuous fiber bundle impregnated with the foaming resin liquid is inserted and interposed, the reinforcing material in the form of a lattice is integrally embedded in the surface layer of the molded product.
Excellent bending strength in the width direction.

Furthermore, molded bodies can be continuously produced through a relatively simple process, which is economically advantageous.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the process of one embodiment of the present invention, and Figure 2 is a perspective view of a long fiber reinforced synthetic resin foam obtained from the process shown in Figure 1. ...Continuous long fiber, 4...Molding passage, 41...Endless belt, 4
DESCRIPTION OF SYMBOLS 2... Guide roll, 5... Belt with many holes perforated, 6... Synthetic resin film, 7... Grid-like reinforcement material, 71... Weft, 72... Warp. , Patent applicant Sekisui Chemical Co., Ltd. Representative Motoshi Fujinuma

Claims (1)

[Claims] A series impregnated with a foamable resin liquid that can foam and harden in Lfn hours! During VC, a long fiber bundle is introduced into a molding passage constituted by an endless belt, and the resin liquid is foamed and cured in the molding passage to produce a long fiber reinforced synthetic resin foam. A belt with a large number of holes drilled sequentially from the endless belt side of the K and U cedar passages so as to be sandwiched between the inner surface of the upper or lower part of the forming passage and the continuous folk fiber bundle from the entrance of the cedar passage. A long fiber-reinforced synthetic resin foam for scaffold boards, characterized in that a synthetic resin film and a lattice-shaped reinforcing material are continuously inserted to complete foaming and curing of the foamable resin liquid within a molding passage. Manufacturing method 1゜2 A patent for using a belt with a large number of holes in which a belt is made into a loop, power is distributed to the outside of the endless belt, and the belt moves together with the endless belt! The manufacturing method according to item 1, wherein the end of 1ilI is within the scope of item 1. The manufacturing method according to claim 1, wherein the λ combination vi, tR resin film is embossed according to Table i1. The lattice-like reinforcing material is made up of a plurality of short weft threads parallel to each other and a plurality of long nine-strand threads glued at predetermined intervals in a direction perpendicular to the weft threads on the surface of the weft threads. A manufacturing method according to claim 1.