JP3142394B2 - Reinforced plastic pipe and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced plastic tube having excellent strength against external pressure and a method for producing the same, and more particularly, to a method for forming a resin tube between a resin inner layer and an outer layer reinforced by a fiber reinforcing material. The present invention relates to a three-layer reinforced plastic pipe provided with an intermediate layer made of resin mortar and a method of manufacturing the same.

[0002]

2. Description of the Related Art Recently, reinforced plastic pipes having excellent workability due to their light weight compared to metal pipes and concrete pipes have been widely used. In particular, reinforced plastic pipes having a three-layer structure in which an inner layer and an outer layer are constituted by a fiber reinforced plastic reinforced by a fiber reinforcing material, and an intermediate layer constituted by a resin mortar is provided between the inner layer and the outer layer, have been used in various fields. In order to be able to use it, its use is also expanding. Such a reinforced plastic pipe having a three-layer structure usually requires an intermediate layer made of a resin mortar, despite the fact that high strength is required for an external force received during transportation, piping work, or after piping. Is smaller than the elongation of the inner layer and the outer layer made of fiber reinforced resin, so that there is a drawback that the inner layer and the outer layer peel off between the respective layers before the inner layer and the outer layer break.

In order to solve this drawback, Japanese Patent Publication No. 53-25877, for example, discloses that a filler is contained between an inner layer and an outer layer made of fiber reinforced plastic and an intermediate layer made of resin mortar. A reinforced plastic tube having a five-layer structure in which glass fiber reinforced plastic layers are interposed is disclosed.

[0004]

SUMMARY OF THE INVENTION The reinforced plastic tube disclosed in the above publication is characterized in that the difference between the elongation of the inner layer and the outer layer and the elongation of the intermediate layer is determined by determining the difference between the elongation of the inner layer, the outer layer and the intermediate layer. As a result, the inner layer and the outer layer are prevented from being separated from the intermediate layer to some extent. However, since the adjacent layers are not firmly bonded to each other, peeling of the inner layer and the outer layer from the intermediate layer cannot be reliably prevented, and sufficient strength against external force cannot be obtained.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a reinforced plastic pipe having high strength against external force, and a method of manufacturing the reinforced plastic pipe by which the reinforced plastic pipe can be efficiently manufactured. Is to do.

[0006]

A reinforced plastic pipe according to the present invention is provided between an inner layer and an outer layer made of a resin reinforced by a continuous fiber reinforcing material, between the inner layer and the outer layer, and has a surface. Roller protrusions with protrusions
Is partially reinforced with a reinforcing material inserted inside.
And an intermediate layer made of the obtained resin mortar, whereby the above object is achieved.

According to the method for manufacturing a reinforced plastic tube of the present invention, a step of laminating an uncured resin layer on the peripheral surface of a cylindrical mold subjected to a mold release treatment, and a step of laminating a fiber reinforcing material on the resin layer. Step and extruding the uncured resin mortar into a sheet, and after contacting the continuous fiber reinforcement with each surface thereof, pass through a roller provided with projections on the surface, and a part of each fiber reinforcement. A step of fitting the resin mortar in a resin mortar, and a step of laminating a resin mortar in which a continuous fiber reinforcement is provided on each surface on the fiber reinforcement laminated on the resin layer,
Curing the resin in the resin layer and the resin mortar, thereby achieving the above object.

[0008]

According to the reinforced plastic pipe of the present invention , a protrusion is formed on the surface.
Part of the roller fits inside due to the protrusion of the roller provided with
The inserted reinforcing material is in a state of being fitted into the resin mortar of the intermediate layer provided between the inner layer and the outer layer, and the inner layer, the outer layer, and the intermediate layer are integrally connected. .

In the method for manufacturing a reinforced plastic pipe of the present invention, a resin mortar sheet serving as an intermediate layer is laminated on a resin layer on which a fiber reinforcing material is laminated. On each surface of the resin mortar, a continuous fiber reinforcement is provided in advance,
Since a part of the fiber reinforcing material was fitted in the resin mortar, the resin in which the resin mortar was laminated and the resin in the resin mortar were cured, and thus provided on each surface of the resin mortar. Each fiber reinforcing material cures while immersed in the resin. As a result, a fiber reinforced material on the surface of the resin mortar becomes a reinforcing material for the inner layer and the outer layer, and a reinforced plastic pipe in which a part of the reinforcing material is fitted in an intermediate layer between the inner layer and the outer layer is manufactured.

[0010]

The present invention will be described below with reference to examples.
FIG. 1 is a longitudinal sectional view showing an example of the reinforced plastic pipe of the present invention. The reinforced plastic tube is provided with an inner layer 10 on the inner peripheral side made of fiber reinforced resin, an outer layer 20 on the outer peripheral side also made of fiber reinforced resin, and a resin provided between the inner layer 10 and the outer layer 20. And a middle layer 30 made of mortar E1. The inner layer 10 includes glass paper C as a reinforcing material,
The glass strand D and the glass fiber mat E2 are used to constitute a glass fiber reinforced resin (FRP). The outer layer 20 also has glass paper G, glass strand F, and glass fiber mat E3 as reinforcing materials. It is composed of the used glass fiber reinforced resin. And the mid layer 30 is made of the glass fiber mat E2.
A part and a part of the glass fiber mat E3 are fitted in the resin mortar E1.

FIG. 2 is a schematic structural view of an apparatus used for manufacturing such a reinforced plastic pipe of the present invention. This apparatus is a dross-holm type molding apparatus, and has a rotating shaft 2 extending horizontally from an apparatus main body 1. A base end of a cylindrical mold 3 is connected to the rotating shaft 2 so as to rotate about the rotating shaft 2. The tip of the mold 3 is open, and the open end is inserted into the curing furnace 8.

An endless steel belt 4 is spirally wound around the mold 3. The spiral steel belt 4
The outer peripheral surface constitutes a mold surface 5, and a resin or the like is sequentially laminated on the mold surface 5 to manufacture a reinforced plastic tube.
The steel belt 4 having the mold surface 5 is moved toward the open end, which is the tip of the mold 3, as the mold 3 rotates. The steel belt 4 reaching the open end of the mold 3 is
After being returned to the apparatus main body 1 through the inside of the mold 3,
It is wound around the mold 3.

A resin supply hose 6 for supplying a thermoplastic resin is disposed opposite the mold surface 5 of the steel belt 4 wound around the base end of the mold 3. The steel belt 4 is located closer to the tip of the mold 3
A resin mortar supply device 7 is arranged to face the mold surface 5.

By the molding apparatus having such a configuration, the manufacturing method of the present invention is carried out as follows, and the reinforced plastic pipe of FIG. 1 is manufactured.

While rotating the mold 3 and sequentially moving the steel belt 4 wound around the mold 3 toward the tip end of the mold 3, a mold surface 5 which is the outer peripheral surface of the steel belt 4 is formed. The release sheet A is spirally wound thereon. And mold surface 5
The thermosetting resin B is supplied from the resin supply hose 6 onto the release sheet A wound thereon, and a thermosetting resin layer is laminated. Next, a glass paper C and a glass strand D as an inner layer reinforcing material are laminated on the resin layer. Then, on the resin layer on which the glass paper C and the glass strand D are laminated, the reinforced resin mortar E supplied together with the glass fiber mat as the reinforcing material by the resin mortar supplier 7 is laminated.

As shown in FIG. 3, the resin mortar supplier 7 has an extruder 7a for extruding a resin mortar E1 using a thermosetting resin into a sheet. Immediately after the extrusion, the sheet-like resin mortar E1 extruded from the extruder 7a is sandwiched between glass fiber mats E2 and E3, and inserted between the pair of rollers 7b and 7b. As shown in FIG. 4 (a), each roller 7b has a large number of triangular pyramid-shaped protrusions 7c protruding at a predetermined pitch on the entire outer peripheral surface, and a reinforced resin mortar E is provided between each roller 7b. By passing, the glass fiber mats E2 and E3 are fitted into the resin mortar E1 by the numerous protrusions 7c provided on the surface of each roller 7b.

The protrusion 7c formed on the surface of the roller 7b may be hemispherical, as shown in FIG.

The basis weight of the glass fiber mats E2 and E3 is preferably 50 to 200 g / m ² . If the basis weight of the glass fiber mat is less than 50 g / m ² , the resin mortar cannot provide a sufficient reinforcing effect due to the glass fiber mat fitted into the resin mortar, and if the basis weight exceeds 200 g / m ² , The rigidity of itself increases, and it becomes impossible to fit a part of the glass fiber mat sufficiently into the resin mortar E1.

The tension for supplying the glass fiber mat E2 is preferably 50 g / cm width to 1 kg / cm width. 50g / cm
If the width is less than the width, the glass fiber mat sags. 1
When the width is not less than kg / cm, the tension of the glass fiber mat E2 is so strong that it is difficult to fit into the resin mortar.

In this manner, the reinforced resin mortar E in which a part of each of the glass fiber mats E2 and E3 disposed on each surface of the resin mortar E1 is fitted into the resin mortar E1 is supplied to the resin mortar supply device. 7, the reinforced resin mortar E is laminated on the resin layer on which the glass paper C and the glass strand D are laminated. After that, the glass strand F and the glass paper G, which are the reinforcing materials of the outer layer, are further laminated on the reinforced resin mortar E.

While the mold 3 is being rotated, a resin layer is laminated on the spirally wound steel belt 4, and further, the resin layer is uncured, and glass paper C and glass strand D When the reinforcing resin mortar E, the glass strand F and the glass paper G are sequentially laminated, they become embedded in the resin layer, and are conveyed together with the steel belt 4 into the curing furnace 8 to be cured. The curing furnace 8 cures the resin layer and the resin mortar. At this time, the glass fiber mats E2 and E3 in the reinforced resin mortar E are impregnated with the uncured thermosetting resin and the surplus resin of the resin mortar E1.

Thus, the inner layer 10 made of glass fiber reinforced resin reinforced by the glass paper C, the glass strand D and the glass fiber mat E2, the glass strand F, the glass paper G and the glass fiber mat E3
Outer layer 20 reinforced with glass fiber mat E2
And a middle layer 30 in which a part of the glass fiber mat E3 is fitted in a resin mortar, to produce a reinforced plastic tube.

In the reinforced plastic tube manufactured in this manner, the inner layer 10 and the intermediate layer 30 are made of a glass fiber mat.
Since the outer layer 20 and the intermediate layer 30 are connected by the glass fiber mat E3 , the inner layer 10 and the intermediate layer 30 and the outer layer 20 and the intermediate layer 30 are connected to each other. The peeling of the layer 30 is prevented. Therefore, this reinforced plastic tube shows high strength against external pressure.

The resin used in the reinforced plastic pipe of the present invention, that is, the thermosetting resin constituting the inner layer 10 and the outer layer 20 and the resin in the resin mortar of the intermediate layer 30 are not particularly limited. For example, unsaturated polyester resin,
Vinyl ester resin, epoxy resin and the like can be used. In particular, vinyl ester resins are preferably used because of their excellent chemical resistance.

Further, in the reinforced plastic pipe of the present invention,
The reinforcing material to be fitted into the mid layer 30 is not limited to the glass fiber mats E2 and E3, and a glass chop may be used. Further, the material of the fiber is not limited to glass, but may be, for example, carbon or organic fiber such as polyester. When a glass chop is used as a reinforcing material for the inner layer 10 and the outer layer 20, as shown in FIG. 5, when extruding the sheet-like resin mortar E1 from the extruder 7a, a plurality of wires E5 extending in the extrusion direction are used. Glass chops E4 are fixed to each
5 is disposed on each surface of the resin mortar E1 extruded in a sheet shape, and the resin mortar E1 is
Inserted between. Thereby, the reinforced resin mortar E in which the glass chop E4 made continuous by the wire E5 is fitted into the resin mortar E1 is obtained. In this case, the amount of the glass chop E4 is preferably 50 to 200 g / m ² . If the amount of glass chop E4 becomes less than 50 g / m ² ,
A sufficient reinforcing effect cannot be obtained by the glass chop E4 fitted in the resin mortar, and if the glass chop E4 exceeds 200 g / m ² , the rigidity of the glass chop E4 increases and the resin mortar E1
It will not be able to fit enough inside. Vinylon, polyester, or the like is used as the wire to which the glass chop is fixed.

Next, specific examples of the reinforced plastic pipe of the present invention will be described. 800m outside diameter using the device shown in Fig.2 and Fig.3
m reinforced plastic tubing was manufactured (Sample A). A glass fiber smut of 100 g / m ² was used as a reinforcing material provided on the surface of the resin mortar, and a glass strand of number 2200 was used as a reinforcing material for the inner layer and the outer layer. Also,
Unsaturated polyester resin (containing 1 phr curing agent and 0.5% accelerator) was used as the resin for the inner and outer layers. The molding speed was 20 m / h. The obtained reinforced plastic tube is
The thickness of the inner and outer layers was 2.5 mm each, and the thickness of the tube was 16 mm. When the manufactured reinforced plastic pipe is cut and observed between the layers, the fiber reinforced resin forming the inner layer and the outer layer and the resin mortar forming the intermediate layer are formed by a glass fiber mat which is a continuous reinforcing material. It was reinforced integrally.

A glass chop (120 g / m ² ) was used in place of the glass fiber mat, and vinylon was used as a strand (wire) for fixing the glass chop to the surface of the resin mortar. To produce a reinforced plastic tube (Sample B). Also in this case, the fiber reinforced resin constituting the inner layer and the outer layer, and the resin mortar constituting the intermediate layer were integrally reinforced by a glass chop fixed to the strand.

For comparison, a reinforced plastic pipe was manufactured by laminating a resin layer on a resin layer without providing a reinforcing material on each surface of the resin mortar (sample C).

For the samples A, B and C, the reinforced plastic pipe was cut into a length of 300 mm and subjected to a crush test and a Charpy impact test. Table 1 shows the results. Samples A and B, which are the reinforced plastic tubes of the present invention, had significantly higher strength against external pressure than Sample C, which was a comparative example.

[0030]

[Table 1]

[0031]

As described above, the reinforced plastic pipe of the present invention is formed by the protrusions of the roller having the protrusions on the surface.
A part of the reinforcing material inserted inside is partially inserted into the intermediate layer, and the inner layer and the outer layer are firmly connected to the intermediate layer by the reinforcing material. Very high, showing excellent strength against external pressure.

Further, according to the method of manufacturing a reinforced plastic pipe of the present invention, a fiber reinforced material is provided on the surface of a resin mortar and the reinforcing material is inserted into the resin mortar by passing between rollers having projections on the surface. As a result, the reinforced plastic pipe of the present invention can be continuously and efficiently manufactured with relatively few man-hours. In addition, the equipment is not economical because it does not increase in size.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an example of a reinforced plastic pipe of the present invention.

FIG. 2 is a schematic diagram showing the entire configuration of an apparatus suitable for implementing the manufacturing method of the present invention.

FIG. 3 is a schematic diagram illustrating a configuration of a sheet feeder.

FIG. 4A is a front view of a roller of a sheet feeder,
(B) is a front view showing another example of the roller of the sheet feeder.

FIG. 5 is a side view showing another example of the sheet feeder.

[Explanation of symbols]

 Reference Signs List 10 inner layer 20 outer layer 30 middle layer E reinforced resin mortar E1 resin mortar E2 glass fiber mat E3 glass fiber mat

Claims (2)

(57) [Claims] 1. A roller provided with an inner layer and an outer layer made of a resin reinforced by a continuous fiber reinforcing material, and provided between the inner layer and the outer layer, and having a projection on the surface.
With a reinforcing material part of which is inserted inside by the protrusion of
A reinforced plastic tube having an intermediate layer made of reinforced resin mortar. 2. A step of laminating an uncured resin layer around a release-treated cylindrical mold, a step of laminating a fiber reinforcing material on the resin layer, and a step of applying an uncured resin mortar to a sheet. After extruding in a shape, after contacting the continuous fiber reinforcing material to each surface, it is passed between rollers provided with protrusions on the surface,
A step of fitting a part of each fiber reinforcing material into a resin mortar, and a step in which a continuous fiber is formed on the fiber reinforcing material laminated on the resin layer.
A method for manufacturing a reinforced plastic pipe, comprising: a step of laminating a resin mortar having a reinforcing material provided on each surface; and a step of curing a resin in the resin layer and the resin mortar.