JPS6411447B2 - - Google Patents

Description

Detailed Description of the Invention "Definition Items in this Specification" In this specification, a resin molded article refers to a resin molded article whose board surface is A board that is square or rectangular and has a flange integrally formed around the periphery of the board. In addition, in the following explanation, mainly
This is carried out in the case where the resin molded body is a unit plate for an assembly type storage tank.

"Industrial Field of Application" When manufacturing a resin molded body by press molding under heating, the present invention provides a method for applying fibers such as glass fiber to the four corners of the panel surface where stress is concentrated during use of the resin molded body. The present invention relates to a method for producing a resin molded body reinforced with main parts, in which a sheet-like reinforcing material made of a quality material is interposed without shifting the position.

"Prior art" In an assembled storage tank 14 as shown in FIG.
A plurality of unit plates 15, 15, which constitute the storage tank 14,
In most cases, the stress that acts on each component is concentrated at the four corners of the board, as shown by arrows A in the figure. Conventionally, in order to deal with such stress concentration, as shown in FIG. A thick reinforcing material 12' made of glass fiber or the like is interposed over the entire surface of the board 15a.

"Problems to be Solved by the Invention" The unit plate 15' as shown in FIG. 5A and the unit plate 15'' as shown in FIG.
The weight of each unit plate 15'' is very heavy, and the work of transporting it and assembling the storage tank 14 (see Fig. 4) has become labor intensive.In particular, the unit plate 15'' as shown in Fig. Not only do wrinkles 16 occur due to the thick reinforcing material 12' during press molding, but also
Product prices were rising due to an increase in the cost of glass fiber materials. Furthermore, as mentioned above, since the resin molded body is manufactured by press molding under heat, it is technically difficult to distribute and interpose small reinforcing materials at the four corners of the board surface 15a as described above. was considered impossible. In other words, during press molding, the softened resin material flows in the mold (not shown) along the shape of the mold, so reinforcing materials are placed and loaded in advance at optimal positions in the mold. Even if there is, it is not possible to accurately position the reinforcing material with respect to the resin molded body after molding.

``Object of the Invention'' The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to manufacture a molded article reinforced with main parts that can accurately position the intervening position of a sheet-like reinforcing material made of a fiber material. The purpose is to provide a method.

"Structure of the Invention" (Means for Solving the Problems) The gist of the method for manufacturing a resin molded article reinforced with main parts according to the present invention (hereinafter referred to as "method of the present invention") is to When press-molding a resin molded body with an integrally formed flange,
In the overlapping part of the connecting shell formed into a square ring by polymerizing the adjacent edges of four band-shaped connecting members made of a fibrous material arranged corresponding to positions along the peripheral edge of the board surface of the resin molded body, Sheet reinforcing materials made of fibrous material arranged corresponding to the four corners of the board are fixed to form a group of interconnecting reinforcing materials, and the group of interconnecting reinforcing materials and the resin material are heated under pressure molding. It is placed on a predetermined position on the upper surface of a mold, and then the upper mold is assembled to produce a resin molded article.

(Operation) The operation of the method of the present invention will be explained based on the embodiment shown in FIGS. 1 to 3. In the connecting reinforcing material group 1, the sheet-like reinforcing materials 2, 2, ... are connected in advance in an annular shape by the connecting tool 4, so that when press-molding together with the resin material 9 in the forming mold (not shown), it softens. Even if the resin material 9 flows along the shape inside the mold, a repulsive force is generated in the connecting member 4 against this flow, so that the sheet-like reinforcing materials 2, 2, . . . are not moved. In addition, in the connecting tool 4, since the overlapping parts 4a, 3a, 3a of the band-like connecting members 3, 3 and the sheet-like reinforcing material 2 are fixed with the band width dimension of the connecting member 3, softening during press molding is prevented. The repulsive tensile stress σ generated in the band width region of the connecting member 3 against the flow of the resin material 9 is small, and local tensile force that causes wrinkles in the sheet-like reinforcing material 2 is not generated. Further, the connecting tool 4 connects the adjacent edges 3a of four band-like connecting members 3, 3,... made of a fibrous material arranged corresponding to positions along the peripheral edge 5b of the board surface 5a of the resin molded body 5. , 3a are polymerized to form a rectangular ring shape, it is possible to easily accommodate various resin molded bodies with different board dimensions by simply adjusting the length of the band-like connecting material 3 according to the size of the board surface 5a. can.

(Example) Hereinafter, the method of the present invention will be explained based on the drawings showing the example.

FIG. 1 is a perspective view showing an assembly type storage tank unit plate 5 obtained by the method of the present invention. This unit plate 5 is made of sheet molding compound (hereinafter referred to as "SMC") as a resin material and has a side of 1 m.
It is formed into a square plate shape, and a group of connecting reinforcing materials 1 is interposed within the board surface 5a.

As shown in FIG. 2, the connecting reinforcing material group 1 consists of four sheet-like reinforcing materials 2, 2, .
a,..., and are connected in a ring as a whole.

The reinforcing material 2 is made of glass fiber, woven glass cloth, carbon fiber, etc., and is formed into a small square sheet shape. The outer dimensions of the reinforcing material 2 are 150 mm in length and width, and 0.5 to 1 mm in thickness.

The connecting tool 4 connects to the peripheral edge 5b of the board surface 5a of the unit body 5.
Adjacent edges 3 of four strip-shaped connecting members 3, 3, ... made of fibrous material arranged corresponding to positions along
A and 3a are polymerized to form a square ring. The connecting member 3 is made of the same material as the reinforcing member 2, is thinner than the reinforcing member 2, and is formed into an elongated band shape. The external dimensions of the connecting member 3 are 1000 mm in length, 150 mm in width, and 0.2 mm in thickness.

As shown in FIG. 3, the interconnected reinforcing material group 1 formed in this manner includes a resin material 9 molded into a plate shape made of SMC and the resin material 9 formed into a plate shape made of SMC on the upper surface of the heated lower mold 7 for pressure molding. A group of connecting reinforcing materials 1 such as the following are placed. The connecting reinforcing material group 1 is placed at the sheet-like reinforcing material 2,
2, . . . are positions arranged at the four corners of the board surface forming portion 7a of the lower mold 7, respectively. In other words, the four corners of the board molded part are stress concentration points when the resin molded body is used. Then, in the same manner as in a normal press molding process, the lower mold 7 and the molding upper mold 8 are joined and pressed to produce a resin molded body.

In addition, in the method of the present invention, when producing a large storage tank or a unit body that is subject to severe usage conditions and requires special strength, SMC is added to the surface and back layers of the connecting reinforcement group 1. Resin material 9,9
It is better to have a so-called Sandermanch structure with a In addition, the square annular k linking tool 4 is one size larger than the size of the board, and its flange 5 is
c (see FIG. 1).

"Effects of the Invention" As is clear from the above explanation, the method of the present invention has the following effects:
It has the following excellent effects.

The sheet-like reinforcement material does not move even when the softened resin material flows along the shape inside the mold.
They are installed at the four corners of the board surface of the resin molded body. As a result, the method of the present invention makes it possible to accurately position the reinforcing material, and to stably supply a resin molded body of a predetermined quality and a constant strength.

The interconnected reinforcement group does not generate local tensile forces that cause wrinkles in the sheet reinforcement. As a result, the method of the present invention makes it possible to accurately position the reinforcing material spread in a sheet shape, and it is possible to stably supply a resin molded body of a predetermined quality and a constant strength.

The connecting tool can be easily formed by simply adjusting the length of the band-like connecting material in accordance with the size of the board surface of the resin molded body. As a result, the method of the present invention can easily be applied even if the size of the board surface of the resin molded body is different.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a unit plate for an assembled storage tank obtained by the method of the present invention, Fig. 2 is a perspective view showing a linked reinforcement group used in the method of the present invention, and Fig. 3 is a perspective view showing an embodiment of the method of the present invention. 4 is an overall perspective view showing a prefabricated storage tank; FIG. 5 is a partially cutaway perspective view of a conventional unit plate for a prefabricated storage tank; A unit plate formed with a large thickness is shown in FIG. 1... Connected reinforcing material group, 2... Sheet-like reinforcing material, 3...
Connecting material, 3a... Edge, 4... Connecting tool, 4a... Overlapping part, 5... Unit plate, 5a... Board surface, 5b... Peripheral part, 7
...lower mold, 9...resin material.

Claims (1)

[Claims] 1. When press-molding a resin molded body in which a flange is integrally formed on the periphery of a square or rectangular board surface, a fibrous material is placed at a position along the periphery of the board surface of the resin molded body. A sheet-like reinforcing material made of a fibrous material placed corresponding to the four corners of the board surface is fixed to the overlapping part of the connecting tool, which is made by overlapping the adjacent edges of four strip-like connecting materials to form a square ring. This group of connected reinforcing materials and the resin material are placed on a predetermined position on the upper surface of a heated lower mold for pressure molding, and then the upper mold is joined to form a resin molded body. 1. A method for producing a main part reinforced resin molded article.