JPH08336850A - Manufacture of frp molding - Google Patents

Abstract

PURPOSE: To facilitate manufacture of an FRP molding having a thin wall part at optional position easily at a low cost with one mold by a method wherein in press molding of molding material containing glass fiber, a projected part forming a thin wall part of a bottom force or a top force is formed with a projected material which is freely attachable/detachable. CONSTITUTION: Four threaded holes on a bottom force 4 are provided at three positions such as a drainage hole of a bath, the drainage hole of a wash place, and the drainage hole of a closet, and four screws are provided respectively to those threaded holes. For example, three pieces of platy projected materials such as 50mm diameter and 5mm thick one for a bath drainage hole, 120mm diameter and 5mm thick one for a wash place trap, and 140mm diameter and 5mm thick one for a closet drainage, are respectively fixed with four screws. Then, a molding material 5 containing glass fiber and unsaturated polyester resin is laminated on the bottom force 4, a top force is placed, and they are molded by heating. After molding with heating, a water proofing pan having a thin wall part at three positions corresponding to the drainage hole is taken out from the mold. For the water proofing pan having the thin wall part manufactured by this method, its hole can be easily opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention applies to an F having a thin portion.
The present invention relates to a method for manufacturing an RP molded body and a mold thereof.

[0002]

2. Description of the Related Art Conventionally, an FRP molded product having a drainage hole has been manufactured by a method of forming a hole with a hole saw after molding or a method of molding a portion where the hole is provided as a thin portion, and an FRP molded product having a thin portion. For example, the body may be formed by a method of using a mold in which a protrusion is provided on the upper mold or the lower mold, which corresponds to the thin-walled part of the mold, or by penetrating the upper mold corresponding to the thin-walled part of the mold. It is manufactured by a piston rod having a cylindrical body.

[0003]

However, in the manufacturing method using the hole saw, it is necessary to make holes in the necessary parts of the FRP molded body with the hole saw, and the same parts as other parts are cut to remove unnecessary parts. There is a problem that the thickness is filled with synthetic resin.In addition, the method using the columnar body provided at the tip of the piston rod that penetrates the mold determines the location where the thin-walled part is formed. There is a problem in that the die must be changed in order to provide the thin wall portion, which is difficult in terms of cost and work. An object of the present invention is to manufacture a FRP molded body having a thin portion at an arbitrary position, particularly a waterproof pan or a bath, easily and at low cost with one mold.

[0004]

According to the invention of the present application, in molding a molding material containing glass fibers by an upper mold and a lower mold, a protrusion for forming a thin portion of the lower mold or the upper mold is detachable. The present invention relates to an FRP molded body having a thin portion formed by a protrusion, particularly to a method for manufacturing a waterproof pan or a bath and a mold thereof.

The projection for forming the thin portion may be provided in either the upper mold or the lower mold, but is preferably provided in the lower mold. The protrusion and the die are attached and detached by, for example, a screw for attaching and detaching the protrusion provided on the protrusion and a screw hole, for example, for attaching and detaching, provided on the die.
Further, when it is not necessary to provide the thin portion, the mold can be made to have a flat surface by inserting a screw into the screw hole of the mold. In addition, in order not to leave a mark of the thread groove on the molded body, the screw portion may be coated, or the mold serving as the back surface of the molded product may be detachable.

The thin portion is usually preferably circular, but can have other shapes. In addition, the detachable protrusion is
It is necessary to prevent the molding material containing the glass fiber from entering the space between the mold and the mold. For example, as shown in FIG. 4, it is necessary to have a member for detaching around the projection. Is preferable because it can prevent a gap between the protrusion and the mold.

If the hardness of the detachable protrusion provided on the upper mold or the lower mold is smaller than the hardness of the mold, the mold is not damaged, which is preferable. Rubber and copper are particularly preferable as the material having a hardness smaller than that of the metal mold of the protrusion.

The FRP molded body is an FRP molded body having a thin wall portion, and in particular, an FRP molded body having a thin wall portion for forming a hole.
It is a molded product, and a bathtub and a waterproof pan are particularly preferable. As the hole, it is particularly suitable for opening a hole such as a drainage hole and a floor sewage flange.

The molding material containing glass fibers is a mixture of unsaturated polyester resin, synthetic resin such as epoxy resin, curing agent, thickener, internal release agent, pigment, filler and the like.

The present invention will be described below with reference to the drawings.

【Example】

Example 1 In the lower mold 4 of FIG. 2, four screw holes as shown in FIG. 3 and FIG. 4 are provided at three positions of the drain hole of the bathtub, the drain hole of the washing room, and the drain hole of the toilet bowl. In addition, it has three screws 2 with a diameter of 50 mm for a bath drain hole, a thickness of 5 mm, a diameter of 120 mm for a washing place trap, a thickness of 5 mm, a diameter of 140 mm for a toilet bowl, and a thickness of 5 mm. Protrusion 1
Are fixed with four screws 2, respectively. Next, the molding material 5 containing glass fiber and unsaturated polyester resin is laminated on the lower mold, and the upper mold is placed and heat-molded. After the heat-molding, the waterproof pan having thin-walled parts at three places corresponding to the drain holes is taken out from the mold. The waterproof pan having a thin portion manufactured by this method could be easily perforated.
In addition, by fixing the screw to the screw hole of the drainage hole of the toilet so that the drainage hole of the toilet bowl becomes flat, there is no drainage hole of the toilet bowl, and the drainage hole of the bathtub and the drainage of the washroom. It was possible to make a waterproof pan with two holes.

Embodiment 2 The upper mold 3 of FIG. 1 is provided with four screw holes as shown in FIGS. 3 and 4 at three positions of a drainage hole of a bathtub, a drainage hole of a washing room and a drainage hole of a toilet bowl, In this screw hole, there are four screws 2; a diameter of 50 mm for a bath drain hole, a thickness of 3 mm, a diameter of 120 mm for a wash-basin trap, a thickness of 3 mm, a diameter of 140 mm for a toilet bowl, and a thickness of 3 mm. Plate-shaped protrusion 1
Each with 4 screws. Next, the molding material 5 containing glass fiber and unsaturated polyester resin is laminated on the lower mold having no protrusion, and the upper mold is placed and heat-molded. After the heat-molding, the waterproof pan having thin-walled parts at three places corresponding to the drain holes is taken out from the mold. The waterproof pan having a thin portion manufactured by this method could be easily perforated. In addition, by fixing the screw to the screw hole of the drainage hole of the toilet so that the drainage hole of the toilet bowl becomes flat, there is no drainage hole of the toilet bowl, and the drainage hole of the bathtub and the drainage of the washroom. It was possible to make a waterproof pan with two holes.

[0012]

According to the invention of the present application, by operating not only the air jet but also the upper and lower sides of the mold not only by the air jet but also by the hydraulic pressure, a thin wall portion is provided not only at the drain hole but at an arbitrary position in the molded article where the hole is desired to be opened. Since it has become possible, it is particularly suitable for changing the positions of drain holes in bathtubs and the sewage flange on the floor. Also, since the position can be easily changed simply by processing the mold, it is possible to manufacture many types of FRP molded products, especially waterproof pans and baths, with one mold, and many molds are required. There is an excellent effect of not doing. By fixing the screw in the screw hole to form a flat surface, it is possible to produce an FRP molded body having no thin portion,
For example, a waterproof pan having a drainage hole for a toilet bowl and a waterproof pan having no drainage hole for a toilet bowl can be manufactured with a single mold.

[Brief description of drawings]

FIG. 1 is a sectional view of an upper mold having a protrusion.

FIG. 2 is a sectional view of a lower mold having a protrusion.

FIG. 3 is a sectional view of a protrusion.

FIG. 4 is a plan view of a protrusion.

[Explanation of symbols]

 1 protrusion 2 screw 3 upper mold 4 lower mold 5 molding material containing glass fiber

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Claims (8)

[Claims] 1. In press molding of a molding material containing glass fiber by an upper mold and a lower mold, a protrusion for forming a thin portion of the lower mold or the upper mold is formed by a detachable protrusion. And a method for producing an FRP molded body having a thin portion. 2. The method for producing an FRP molded body according to claim 1, wherein the hardness of the detachable protrusion is smaller than the hardness of the mold. 3. The method for producing an FRP molded article according to claim 1, further comprising a member for attaching and detaching the detachable protrusion around the protrusion. 4. The method for producing an FRP molded product according to claim 1, wherein the FRP molded product is a waterproof pan or a bath. 5. A molding die comprising an upper die and a lower die,
A mold, wherein a protrusion for forming a thin portion provided on the lower mold or the upper mold is a detachable protrusion. 6. The mold according to claim 5, wherein the hardness of the removable protrusion is smaller than the hardness of the mold. 7. The mold according to claim 5, further comprising a member for attaching and detaching around a detachable protrusion. 8. The mold according to claim 5, wherein the FRP molded body is a waterproof pan or a bath.