JPS6219432A - Forming of ultraviolet-cured fiber reinforced plastic - Google Patents

Abstract

PURPOSE:To provide the forming of ultraviolet-cured FRP, in which no crosswise slippage and the like generates, by a method wherein firstly the end parts are cured and, after the cured end parts are being held, uncured portion is shaped and cured. CONSTITUTION:Firstly, the end parts of a forming sheet 1 fed are irradiated with ultraviolet light by ultraviolet-light irradiation lamps 5a and 5b in a pair of ultraviolet-light irradiation boxes 4a and 4b which are arranged in the feeding passage of the forming sheet 1 so as to cover both the end parts of the forming sheet 1, in order to be quickly cured. Secondly, the forming sheet 1, the cured end parts 1a and 1b of which are held with clamps 6a and 6b, is transferred to a shaping process 7 so as to be formed in the inverted U-shape by means of a plurality of rolls 8 and sent out to a curing process 9, during which the forming sheet 1 is irradiated with ultraviolet light by ultraviolet-light irradiation lamps 10. The forming sheet 1 is cured by being irradiated with ultraviolet light passing among respective shaping rolls 8' so as to be sent out in the form of a molded part 1' such as gutter at the eaves or the like. Because the end part is cured, no flowing-out of resin occurs and crosswise slippage can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a molding method for manufacturing rain gutters and various other molded products using ultraviolet curable FRP as a molding material.

Recently, as a new type of molding material, ultraviolet curable FRP has been developed, which is made by coating both sides of a glass fiber-containing unsaturated polyester resin layer that can be cured by ultraviolet irradiation with an ultraviolet transparent film. Ta.

Such a method of forming ultraviolet curable FRP includes, for example, as shown in FIG. It is bent into a mold, sent to an ultraviolet curing mold 104 that is fixedly supported on a support stand 103, etc., where it is sized and cured by being exposed to ultraviolet rays from an ultraviolet irradiation device (not shown). Although it is conceivable to continuously manufacture molded products of irregular shapes such as gutters and corrugated plates, the following problems arise in the process.

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That is, in the above-described molding method, if the UV-curable FRP is not regulated in the traveling direction when being fed into the forming Ronil 102 or the UV-curing mold 104, it may shift laterally in the traveling direction. In severe cases, it may come off the forming roll 102, resulting in the production of defective molded products or the inability to mold. For this reason, it is necessary to grasp the ends of the UV-curable FRP to prevent it from shifting in the direction of travel, but uncured UV-curable FRP is so soft that it is extremely difficult to grasp it with clamps, etc. Not only can it not be held securely, but also resin may leak out from the edges, which is a major hindrance to producing molded products with a good finish.

The present invention of L was made in view of the above circumstances, and aims to provide a method for molding ultraviolet curable FRP in which the ultraviolet curable FRP does not cause lateral displacement during the molding process, The gist of the present invention is a method for molding an ultraviolet curable FRP, which is characterized in that after hardening the end portion and gripping the hardened end portion, the unhardened portion is shaped and hardened.

Sakuichimi LL effect - Ultraviolet curing type F according to the present invention using the above-mentioned means
According to the RP molding method, when sending the ultraviolet curable FRP to the forming process such as a forming roll, only the ends of the UV-curable FRP are hardened in advance, so the hardened ends can be easily grasped using a clamp or the like. This makes it possible to completely eliminate lateral displacement of the ultraviolet curable FRP during molding. Also, since the edges are hardened,
There is no resin flowing out from this part.As described above, according to the present invention, it is possible to eliminate the lateral shift of the ultraviolet curable FRP, and there is also no resin flowing out from the edges, so the finished product of the molded product can be improved. EXAMPLE 1 The present invention will be described below based on an illustrated embodiment.

FIG. 1 is an explanatory view of the molding process in which the ultraviolet curable FRP molding method according to the present invention is implemented, and shows the molding process in the case of continuously manufacturing rain gutters and the like from the ultraviolet curable FRP.

Reference numeral 1 denotes a long molded sheet made of ultraviolet curable FRP, which is continuously supplied to the following steps by a feed roller 2. First, only the ends of the supplied molded sheet 1 are hardened in an end hardening step 3. This edge hardening step 3 is the second
As shown in the figure and FIG.
s4b, each ultraviolet irradiation box 4a14
The inside of b is equipped with ultraviolet irradiation lamps 5a and 5b,
The edges of the supplied molded sheet 1 are irradiated to quickly harden it. In addition, if you harden not only the ends (the center part is also fixed width) and grip the ends and the center part during molding as described later, it will be possible to take out the center or pull it out when manufacturing wide molded products such as corrugated sheets. It is convenient to take.

Next, the cured end portions 1a and lb cured as described above are held by a clamp E3a%8b as shown in FIG. 2, and the molded sheet 1 is conveyed in this state to the molding step 7. In the forming process 7, the formed sheet 1 is formed by a plurality of rolls 8.
is gradually formed into a substantially inverted U-shape and sent to a curing step 9. The curing step 9 is a step of irradiating the forming sheet 1 with ultraviolet rays using an ultraviolet irradiation lamp °10, as shown in FIGS. 1 and 4, when the forming of the forming sheet 1 is completed by the forming roll 8. The molded sheet 1 is cured by being irradiated with ultraviolet rays from between the forming rolls 8', and the desired rain gutter or the like is sent out as a molded product 19. Irradiation lamp 0 is as shown by arrows X and Y in FIG.
By swinging or rotating, the molded sheet 1 is uniformly irradiated.

In the above embodiment, the edges are cured by placing the ultraviolet irradiation boxes 4a and 4b at the ends of the molded sheet 1, but as shown in FIG. The end portions may be hardened by arranging a cover 11 whose only portion is made of an ultraviolet-transparent material 12, 13, and suitable examples of such ultraviolet-transparent material include soda glass, potash glass, borosilicate glass, and colored glass. In addition, methyl methacrylate, polycarbonate, etc. can be used.

Further, although a clamp is generally used to grip the hardened end, the clamp is not particularly limited to this.

Furthermore, the forming process and the curing process are not limited to those using a forming roll as in the above embodiment, and for example, as shown in FIG. good. In FIG. 0, a plurality of molds 15 fixedly supported by a support base 14 etc. are arranged in succession with an ultraviolet irradiation space 16 provided between them, and ultraviolet irradiation lamps 17 are arranged around them. A curing process is being carried out. As shown in FIG. 7, the mold 15 consists of a male mold 18 with a roughly inverted U-shaped cross section and a female mold 19 with a roughly U-shaped cross section that covers the male mold 18. sheet 1
slides between these male mold 18 and female mold 19. In this case, if air is forced or oil is conveyed between the molded sheet 1 and the male mold 18 and/or the female mold 19, the molded sheet slides smoothly. In addition, as the mold 15 in FIG. 6, a pressure molding mold consisting of a lid 18 and a mold 20 as shown in FIG. 8 may be used. Furthermore, when performing discontinuous vacuum or pressure forming, the molded sheet 1 is cut into rectangles, the four circumferences are partially cured in an ultraviolet irradiation box, and the cured ends are held with clamps to remove the uncured parts. What is necessary is just to irradiate ultraviolet rays and harden it while shaping the central part in a vacuum or compressed air.

In short, in the present invention, any method of shaping and curing may be used.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing the molding process of the ultraviolet curable FRP molding method according to the present invention, and FIG.
A schematic plan view explaining the edge hardening process, FIG. 3 is an AA end view of FIG. 1, FIG. 4 is a B-B end view of FIG. 1, and FIG. 5 is an edge hardening process according to another example. FIG. 8 is a schematic side view showing the molding process according to another embodiment, and FIG.
FIG. 8 is an explanatory end view showing another example of a mold, and FIG. 9 is a schematic side view showing a conventional molding process. 1... Molding sea) 1a1 lb... Hardened end 3... End hardening process 7... Molding process 9...
Curing process patent applicant Takiron Co., Ltd. Figure 2 Figure 9

Claims (1)

[Claims] (1) A method for molding an ultraviolet curable FRP, which comprises curing the end portion and gripping the hardened end portion, and then shaping and curing the unhardened portion.