JPS59104930A - Reinforced plastic pipe and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforced plastic pipe particularly excellent in terms of wear resistance and an inexpensive manufacturing method thereof.

Reinforced plastic pipes used as civil engineering piping are generally made by wrapping a nonwoven fabric impregnated with a thermosetting resin material around the outer periphery of a core mold for forming the pipe body, and applying the so-called filament winding method to the outer part. A tubular body is formed, if necessary, a wood mortar layer is formed on the outer periphery of the tubular body, an outer layer is formed by applying the filament winding method again, and the latter type is manufactured by heating and thinning treatment. The specific structure of the strong-impact snack tube manufactured in this way is shown in Figure 1 ([
phase] 74 hif.

The following explanation is based on a partial cut of the wall of a plastic tube in the direction of the tube axis.

That is, 5 is a non-woven fabric constituting the innermost layer, and 6 is a wound roving (hereinafter referred to as "horizontal strip") made of continuous glass fibers.
), and a longitudinal fiber (glass fiber cut to an appropriate length, hereinafter referred to as "vertical fiber") is placed in the middle of the inner FRP layer (hereinafter simply referred to as "inner layer"). ) A is formed, and on the outer layer side thereof, a mortar layer B is constituted by a resin mortar band 10 and a holding member 12 of the mortar <j) 10. On the outer layer side of the mortar layer B, the horizontal strips 1B and 1B are again wrapped around the vertical strips 14 to form the outer layer F.
An RP layer vessel (hereinafter simply referred to as "outer layer") C is formed, and a surface wave covering material 15 is further disposed on the outermost layer.

Compared to concrete pipes, this Yuzu reinforced plastic pipe has advantages such as light weight, flexibility, corrosion resistance, and ease of pipe construction, so it can be used for urban sewage, industrial wastewater, etc. Although it has come to be widely used for sewage piping (hereinafter referred to as F ``sewage''), the following problems have been pointed out as sewage piping and it has been neglected.

That is, it goes without saying that sewage piping must maintain sufficient watertightness over a long period of time, from the viewpoint of preventing sewage treatment stagnation and soil contamination.

However, since sewage water contains various impurities, the innermost layer of sewage pipes is easily worn out by these impurities.
There is a problem in that watertightness may be significantly reduced depending on the extent of this wear area. However, as mentioned above, the innermost layer of conventional reinforced plastic pipes is made of non-woven fabric;
Specifically, it is a nonwoven fabric impregnated with a thermosetting resin,
As the nucleus woven fabric, a stitched fabric made of organic fibers such as polyester fibers is commonly used. Therefore, there was a quality problem in that the MV1 layer was relatively easily abraded due to the characteristics of the nonwoven fabric and non-uniform impregnation of the rice grain layer.

On the other hand, regarding the manufacturing method, when wrapping the non-woven fabric around the rotating core mold, wrinkles sometimes occur in the non-woven fabric, but these wrinkles simply cause the shape of the product to have a good image. Not only does it fail, but there is also a risk that the above-mentioned wear may lead to local deterioration, so it is necessary to perform the rewinding operation, and the workability becomes worse accordingly. In addition, the process of wrapping non-woven fabric around a socket-type part has many variations, so it is a good idea to mechanize it. Workability is improved.These drawbacks on the drawing surface have been an impediment to reducing manufacturing costs.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to improve the abrasion resistance of the innermost part of the reinforced plastic pipe, thereby increasing its water resistance and production efficiency. The purpose of the present invention is to provide a reinforced plastic pipe and a method for manufacturing the same.

The present invention, which has achieved the above object, is a reinforced plastic tube characterized in that the innermost layer is composed of a resin layer mixed with at least sand, and a rotating core type tube. This method of manufacturing a reinforced plastic pipe is characterized in that a thermosetting resin layer mixed with sand is formed as the innermost layer, and then a pizp layer is formed on the outer periphery of the resin layer.

The l'+A configuration and the effects of the present invention will be explained below based on the drawings of the embodiments. However, the following embodiments are merely representative examples of cars, and are not limited to the i8'' angle which limits the present invention. , all design changes within the range that can comply with the spirit of the above and below descriptions belong to the technical scope of the present invention.

FIG. 2 is a schematic plan view illustrating the pressing process of the reinforced plastic pipe according to the present invention, particularly illustrating the continuous molding method of the FC reinforced dewastic pipe using a continuous molding device. mortar layer in the middle u6
Although one of the eight layers formed is shown, there is no reason to be limited to this, and it may be molded into a single layer. The present invention is applicable to any device in which a fibrous layer made of carbon fibers is used. In Figure 2, reference numeral 1 schematically shows a core drive forming mechanism, which includes a holding drive mechanism that holds the mandrel 2 horizontally and rotates the mandrel 2 in a fixed direction, and a An endless steel belt 8 is wound around the mandrel 2 without any gaps, and the steel belt 8 is pushed sequentially toward the tip of the mandrel 2 by the width of the steel belt. Along with forming the core metal of the molded tube.

A tube forming material, which will be described later, is wound and laminated around its outer periphery.

The heat treatment device agitation provided inside and on the outer periphery of the mandrel 2 hardens the tube forming material. After curing, the steel belt 8 forming the core metal is unraveled from its tip and attached to the mandrel 2.
24! to the core drive forming mechanism 1 through the center of the core metal drive forming mechanism 1! It is wound again in a spiral around the outer periphery of the mandrel 2. 4 is a 111-shaped material which may be coated with a silicone resin, but is preferably a cellophane film, and the figure shows the case where the cellophane tape 4 is wound. Note that this cellophane tape 4 is removed after being released from the mold after curing and molding. Reference numeral 21 denotes a sand-containing resin layer formed as the innermost layer on the outer periphery of the cellophane tape 4, and the formation procedure is as follows. That is, FIG. 8 is a cross-sectional view taken along the cut line 11 mm-1II in FIG. It is located on the top surface of the cellophane tape 4 that has been wound as a tape.

As the sand supply device 21', a conventional one can be used, and an example thereof is shown in FIG.

22 is supported by a suitable support member in a sand tank, the bottom of which is formed with a cutout 22'. A gate 28 operated by an air cylinder or the like is housed in the cutting port 22', and by retracting the gate 28, the sand in the tank 22 is discharged from the cutting port 22' to the position described above. 2
8 is a resin nozzle, and a suitable pressure discharge nozzle or spray nozzle can be used.

29 is a resin supply pipe, 80 is a flow lid type 4B-forming device,
The resin supply amount is maintained in accordance with the speed of the cellophane tape 4, and the resin supply can be interrupted when the tape 4 stops. Further, a brush 81 is provided between the resin nozzle 28 and the sand tank 22 to flatten the large number of granular resins squeezed out from the resin nozzle 28 onto the cellophane tape 4. In the vicinity of and #lJ781
A pressing roller 24 is disposed on the opposite side to mix all of the thrown sand into the resin layer. Therefore, a resin layer is formed at the lower part of the sand cutting outlet 22' of the sand supply device 2r, and after the thrown-out sand adheres to the resin layer, it completely penetrates into the &I oil layer by the suppression roller 24. Sand-mixed resin 1 and 21 are formed. When discharging sand, the particle size of the sand should be 100 to 200 mesh, and the amount of giraffes per wick surface area should be 100 to 800 g/n. It is recommended that the sweetfish be prepared at a rate of 16. In other words, a mesh as fine as 200mesh is less effective in improving the abrasion resistance of the resin layer 21, while a mesh coarser than 100mesh will cause the inner surface of the aI resin layer 21 to lose its smoothness and cause water to flow. This is because the flow resistance increases.Also, if the number of aoOg/doors is increased, the flow resistance will increase, but if the number of aoOg/doors is increased by 100g/m', the above-mentioned improvement in abrasion resistance will not be effective. This is because there are few. A large number of the rovings 6 are lined up, passed through a storage tank of thermally sandizable resin material, coated with resin, and wound around a rotating core to form the main body of the reinforced plastic tube. In some cases, the resin material is coated after the roving 6 is wrapped. However, the roving 6 serves as a reinforcement for the circumference of the pipe, and maintains strength in the axial direction of the pipe and prevents damage. Therefore, as shown in the figure, the glass fibers 7 for the vertical fibers are used, and the glass fibers 7 for the vertical fibers are supplied directly to the winding section during winding of the roving 60, or a carrier fiber exclusively for the vertical fibers is used. Although the roving may be wound in layers, it is preferable to wind it together with the roving 6, and the figure shows that the roving 6 is used again and the lfR tea 7 for vertical stripes is arranged and supplied thereon. The winding of these rovings 6 and longitudinal fibers 7 is called so-called filament winding, and hereinafter simply referred to as a wine tank. 8 is a mortar mixing wire extrusion device, and granules such as silica sand, a binder, and appropriate additives are kneaded, and 1111 L is extruded by a screw extrusion device. The extruded mortar band 1O is formed into a suitable shape, for example, a flat rectangular cross section, and wound around the outer periphery of the wine tank 6□7. Reference numeral 9 guides the mortar band 10 extruded by the discharge guide portion so as to tightly wrap it around the mortar band 10. The holding member for the 12id mortar band 1O has a small adhesion force to prevent the mortar band 1O from separating from the wrapped layer, and a function to prevent the mortar band 1O from deforming due to the winding loosening force of the winding that is wound in the first place. and is supplied along the mortar zone IO. As the holding member 12, a nonwoven fabric similar to the nonwoven fabric 5 is used. 11 is the guide lower of the holding member 12 and the pressure of the moiretal band lO? Assists V-wrapping. 18 and 14 are outside! With the winding forming ``I'', the inner layer forming winding] the same J, fS with the bobbed roving 6 and the vertical strip 1 thread 7.
t7 is completed and rolled @ is taken. Furthermore, after the surface temporary wood (15) is wound, it passes through a thermosetting treatment device 16 to form a
As shown in the figure, the operation of the reinforced plastic tube of the present invention in which the sand-mixed resin layer 21 is completely formed on the innermost layer is completed.

+1ti in the thus obtained reinforced plastic tube
J JXIn order to confirm the effect of improving wear resistance,
Regarding the conventional reinforced plastic pipe that has a nonwoven fabric in the innermost layer and an FRP layer on the outside, and the reinforced plastic pipe of the present invention that has a sand-containing resin layer in the innermost layer and an FRP layer on the outside, When we conducted a taper set wear experiment using the side piece of a sand vapor (≠180), we found that the following
The results shown in the table were obtained.

As is clear from Table 1 above, the wear rate in the case of the reinforced plastic pipe of the present invention is approximately 70 times that of the conventional example (■), and nI
It became clear that the wear resistance could be improved by about 80q6.

By the way, in the above manufacturing process, especially in the process of forming the innermost layer, 1e15 is sprayed and mixed after the resin is sprayed, so there is no need to rewind the work due to the wrinkles that occur when winding a nonwoven fabric as in the past. etc. are unnecessary, and it is also possible to perform the work on the mouth-shaped parts such as the raised socket type by a machine.

As a result, crop performance can be greatly improved.

In addition to improving work efficiency, it is possible to reduce manufacturing costs.

In the above embodiment, the method of forming the innermost layer is to mix sand after coating the resin, but it is also possible to coat the resin mixed with sand in advance.

For example, as shown in FIG. 5, resin pellets from a resin tank 88 and sand from a sand tank 84 may be charged into a hopper 82 of a resin kneading extruder 81. fji 28~8
The (7q configuration of 1 is the same as in FIG. 8).

Furthermore, although a 1 Jd hard grease layer is sufficiently effective as the innermost layer, it is also possible to further increase the strength by appropriately laying a nonwoven fabric inside the layer.

For example, as shown in FIG. 6, while the mixed resin is extruded from the resin supply pipe 29 like a sword and stored in the tank 85 to form a sand-mixed resin bath 86, the non-woven fabric 6 is passed through the resin bath 86 and then the cellophane All you have to do is wrap it around the tape 4.

In the above embodiment, a continuous 9-core molding device based on the so-called Dorstholm method was applied, but for example, a single core mold may be rotated in a fixed position to perform winding layer molding, or a single core mold may be used. It can also be used in a method in which the core molds are rotated and moved a specific distance to perform winding layer formation, or in a method in which a large number of individual core molds are rotated and layered while sequentially moving in the axial or lateral direction of the core molds.

Since the reinforced plastic pipe and its nine manufacturing methods of the present study have been developed as described above, it is possible to provide a reinforced plastic pipe that is even better in terms of shore abrasion resistance, and also to improve its manufacturing method. By improving workability, we were able to increase production efficiency and reduce manufacturing costs.

[Brief explanation of drawings]

Figure 1 shows the main part of conventional reinforced plastic f"ψ"
FIG. 282 is a schematic plan view illustrating the manufacturing process of the reinforced plastic pipe according to the present invention, and FIG.
FIG. 4 is a schematic vertical cross-sectional view of a main part illustrating the reinforced plastic tube of the present invention, and FIGS. 5 and 6 are other examples of manufacturing processes. A...Inner FRP) So B...Mortar layer C Outer curve I FRP)m 5...Nonwoven fabric 21...
Sand-mixed ladle layer 2r...Sand supply device 22...H small tank 29...Resin supply no.) Eve...Sand-mixed resin bath Kubota Iron Works Co., Ltd. Fig. 3 21'

Claims (1)

[Claims] 11) A reinforced plastic tube formed by forming an FRP layer while rotating a core mold, and providing a mortar layer in the middle as necessary, the innermost layer of the wire tube having at least A reinforced plastic pipe characterized by having a resin layer mixed with sand. (2. In claim 1, the innermost layer is a resin layer containing sand and nonwoven fabric. (3) In claim 1 or 2, the particle size of sand is 100 to 200. Reinforced plastic tube that is made of mesh and has a mixed amount of 100 to 800 g/- in weight per core mold surface area. A method for producing a reinforced plastic pipe, which comprises forming an FRP layer on the outer periphery of the resin layer after forming the inner layer. (6) In claim 4 or 5, the grain size of the sand is 100 to 200 m2V and the amount of sand mixed is A manufacturing method in which the surface area of the core type is 100 to 800 g/door.