KR102515498B1 - Grp pipe based on multi-directional fiberglass reinforcement, method for manufacturing the grp pipe and apparatus for manufacturing the grp pipe to improve performance - Google Patents

Abstract

A method for manufacturing GRP pipes based on multi-directional glass fiber reinforcement to improve performance and a device using the same are disclosed. An automated GRP pipe manufacturing device, according to an embodiment, comprises: a control unit that controls the GRP pipe manufacturing device; a mandrill; a liner layer forming unit that forms a liner layer by providing a liner layer circumferential reinforcement material, a liner layer multi-directional reinforcement material, and a first resin on a base moving along a surface of the mandrill; a first heating unit that is disposed inside the mandrel and thermally connected to the mandrel to provide heat for curing the liner layer to the liner layer through the mandrel; a structural layer forming unit that forms an inner layer by providing an inner layer circumferential reinforcement material, an inner layer multi-directional reinforcement material, and a second resin on the liner layer, forms a core layer by providing a core layer circumferential reinforcement material, a core layer multi-directional reinforcement material, sand, and the second resin on the inner layer on the inner layer, and forms an outer layer by providing an outer layer circumferential reinforcement material, an outer layer multi-directional reinforcement material, and the second resin on the core layer; and a second heating unit that is disposed outside the liner layer, the inner layer, the core layer, and the outer layer and provides heat for curing the liner layer, the inner layer, the core layer, and the outer layer. The liner layer forming unit includes a liner layer resin tank for accommodating the first resin, and the structural layer forming unit includes a structural layer resin tank for accommodating the second resin. The control unit may control the temperature of heat provided from the first heating unit and the second heating unit, and the internal temperature of the liner layer resin tank and the structural layer resin tank.

Description

GRP pipe based on multi-directional glass fiber reinforcement for performance improvement, GRP pipe manufacturing method and GRP pipe manufacturing apparatus }

The following embodiments relate to a multidirectional glass fiber reinforcement-based GRP pipe manufacturing method and apparatus using the same for performance improvement.

GRP pipes (Glass-fiber reinforced plastic pipes) are manufactured by winding glass fibers, such as conventional glass roving, on a pipe base using a filament winding method and impregnating them with resin, or by using various other methods.

However, the existing method creates a reinforcing layer only in a specific axial direction, which has a problem of poor stability against external pressure and internal pressure in directions other than the corresponding axial direction. For example, in the past, reinforcing layers such as glass fibers were used for axes requiring strength, such as in the circumferential direction, in the longitudinal direction, and in the compression direction, in consideration of the load applied according to the use of the pipe. However, in this case, there was a problem of poor safety against external pressure and internal pressure in a direction other than the direction in which the reinforcing material was introduced.

Accordingly, an object of the present invention is to manufacture a GRP pipe by combining a multi-directional reinforcing material between glass rovings to manufacture a GRP pipe having improved strength in various directions in addition to the axial direction, and an automated GRP pipe manufacturing device for manufacturing the pipe is to provide

The embodiments overcome the disadvantages of the conventional winding method using glass roving, thereby increasing strength in all directions, improving stability, and securing high performance compared to manufacturing cost. To manufacture a GRP pipe that can improve economic efficiency am.

In addition, the embodiments are intended to manufacture a GRP pipe with improved durability while improving production speed through temperature control and input amount control of various components included in the GRP pipe.

In addition, the embodiments are intended to manufacture a GRP pipe that can be easily inserted into a connector by performing grinding on the GRP pipe.

The problem to be solved in the present application is not limited to the above-described problem, and problems not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. .

GRP pipe automation manufacturing apparatus according to an embodiment includes a control unit for controlling the GRP pipe manufacturing apparatus; mandrel; a liner layer forming unit for forming a liner layer by providing a circumferential liner layer reinforcing material, a multidirectional liner layer reinforcing material, and a first resin on the base moving along the surface of the mandrel; a first heating unit disposed inside the mandrel and thermally connected to the mandrel to provide heat for curing the liner layer to the liner layer through the mandrel; An inner circumferential reinforcement material, an inner multidirectional reinforcement material, and a second resin are provided on the liner layer to form an inner layer, and a core layer circumferential reinforcement material, a core layer multidirectional reinforcement material, sand, and the second resin are provided on the inner layer. a structural layer forming unit which forms a core layer and forms an outer layer by providing an outer circumferential reinforcing material, an outer multidirectional reinforcing material, and the second resin on the core layer; and a second heating unit disposed outside the liner layer, the inner layer, the core layer, and the outer layer, and providing heat for curing the liner layer, the inner layer, the core layer, and the outer layer, wherein the liner The layer forming unit includes a liner layer resin tank accommodating the first resin, the structure layer forming unit includes a structural layer resin tank accommodating the second resin, and the control unit comprises: the first heating unit; 2 It is possible to control the temperature of the heat provided from the heating unit and the internal temperatures of the liner layer resin tank and the structure layer resin tank.

In addition, a GRP pipe manufacturing apparatus for manufacturing a GRP pipe that is partially inserted into a GRP pipe connector for connection between GRP pipes according to an embodiment includes a mandrel; a liner layer forming unit for forming a liner layer by providing a circumferential liner layer reinforcing material, a multidirectional liner layer reinforcing material, and a first resin on the base moving along the surface of the mandrel; An inner circumferential reinforcement material, an inner multidirectional reinforcement material, and a second resin are provided on the liner layer to form an inner layer, and a core layer circumferential reinforcement material, a core layer multidirectional reinforcement material, sand, and the second resin are provided on the inner layer. a structural layer forming unit which forms a core layer and forms an outer layer by providing an outer circumferential reinforcing material, an outer multidirectional reinforcing material, and the second resin on the core layer; a finishing unit for applying a non-woven fabric and a release film on the outer layer; And it may include a grinding unit for grinding a portion of the outer surface of the GRP pipe to be inserted into the connector for the GRP pipe.

The solutions to the problems of the present application are not limited to the above-described solutions, and solutions not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. You will be able to.

According to the embodiments, by manufacturing a GRP pipe including multi-directional reinforcing materials, strength in all directions is increased, stability is improved, and high performance compared to manufacturing cost is secured, thereby manufacturing a GRP pipe with improved economic feasibility.

In addition, according to the embodiments, it is possible to manufacture a GRP pipe with improved durability while increasing the production speed through temperature control and input amount control of various components included in the GRP pipe.

In addition, according to embodiments, it is possible to manufacture a GRP pipe that can be easily inserted into a connector by performing grinding on the GRP pipe.

The effects of the present application are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

1 is a schematic diagram of an automated GRP pipe manufacturing apparatus according to an embodiment.
2 is a diagram for explaining a base providing unit of a device according to an exemplary embodiment.
3 is a view for explaining a liner layer forming unit according to an exemplary embodiment.
4 is a view showing a curing curve according to the type of resin and the content of the curing agent according to an embodiment.
5 is a view for explaining a first heating unit according to an embodiment.
6 is a view for explaining a structure layer forming unit according to an exemplary embodiment.
7 is a view showing a layer structure of a completed GRP pipe according to an embodiment.
8 is a view for explaining a connector according to an embodiment.
9 is a view for explaining a grinding part and a cutting part according to an embodiment.
10 is a diagram for explaining a grinding unit according to an exemplary embodiment.
11 is a diagram for explaining grinding of a GRP pipe of a grinding unit according to an embodiment.

The foregoing objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. However, the present invention can apply various changes and can have various embodiments. Hereinafter, specific embodiments will be illustrated in the drawings and described in detail.

In the drawings, the thickness of layers and regions is exaggerated for clarity, and elements or layers may be "on" or "on" other elements or layers. What is referred to includes all cases where another layer or other component is intervened in the middle as well as immediately above another component or layer. Like reference numerals designate essentially like elements throughout the specification. In addition, components having the same function within the scope of the same idea appearing in the drawings of each embodiment are described using the same reference numerals.

If it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of this specification are only identifiers for distinguishing one component from another component.

In addition, the suffixes "module" and "unit" for the components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinguished from each other by themselves.

1 is a schematic diagram of an automated GRP pipe manufacturing apparatus according to an embodiment.

Referring to FIG. 1 , in one embodiment, an apparatus 1 includes a mandrel 100, a base providing unit 200 providing a base on the mandrel, and a liner layer forming unit 300 providing a liner layer on the base. ), a structure layer forming unit 400 for forming a structure layer on the liner layer, a first heating unit 500 for providing heat inside the mandrel, and a second heating unit for providing heat outside the liner layer and the structure layer ( 600) and a controller 700.

The controller 700 may control the operation of at least one of the components 100 to 700 included in the device 1 . In addition, the controller 700 may control at least one of the content, number, density, or temperature of materials included in the base, liner layer, and structural layer.

In addition, the control unit 700 controls the set values of the internal configuration of the device 1 to correspond to the specifications and/or physical properties (eg, durability, strength, watertightness, additional safety factor, etc.) of the GRP pipe required in the industrial field. can do. For example, the control unit 700 may adjust the forward speed of the base by adjusting the rotational speed of the belt of the base providing unit 200 . As another example, the control unit 700 may adjust the axial direction of the circumferential reinforcing members provided from the liner layer forming unit 200 and/or the structural layer forming unit 300, the number of fibers provided, and/or the number of textures. As another example, the controller 700 may adjust the size of the multidirectional reinforcing member provided from the liner layer forming unit 200 and/or the structural layer forming unit 300 .

As another example, the controller 700 may adjust the thickness of the liner layer or the structural layer. As in the above examples, the control unit 700 can control all configurations inside the device 1 for all set values of the GRP pipe manufacturing process that can be adjusted inside the device 1.

In addition, the control unit 700 may be physically one or may be plural. For example, when there are physically a plurality of controllers 700 , the controllers 700 may include detailed controllers that individually control at least some of the components 100 to 700 included in the device 1 . In addition, as an example, the controller 700 includes a first temperature controller for controlling the temperature of the first heating unit 500, a second temperature controller for controlling the temperature of the resin provided from the liner layer forming unit 300, and a structural layer. The third temperature controller controls the temperature of the resin provided from the forming unit 400, the fourth temperature controller controls the temperature of the sand provided from the structural layer forming unit 400, and the temperature of the second heating unit 600 It may include a fifth temperature controller for controlling. Hereinafter, for convenience of description, it is assumed that the control unit 700 is physically one, but is not limited thereto.

In addition, the mandrel 100 may mean a mold for forming a material. For example, the mandrel 100 may refer to a metal disposed inside a GRP pipe manufactured in a process of manufacturing a GRP pipe according to an embodiment. In addition, it will be appreciated that the mandrel 100 may preferably have a cylindrical shape, but is not necessarily limited thereto, and may be molded into various shapes that are easy for those skilled in the art as a frame for manufacturing a GRP pipe.

In addition, the device 1 according to an embodiment may include a base providing unit 200 . Here, the base providing unit 200 may provide a base on the surface of the mandrel 100 during the manufacturing process of the GRP pipe. In this specification, the base may refer to a frame on which a liner layer and/or a structural layer of a GRP pipe to be described later are laminated. The base may be a direct component as one layer of GRP pipe, or it may serve as a formwork to be removed after each layer of GRP pipe is stacked. For example, the base may be a branch pipe, and the base may advance along the surface of the mandrel 100 . Also, as an example, when the base advances along the surface of the mandrel 100, the mandrel 100 may not rotate and the base may advance along the surface of the mandrel 100 via the belt. The direction in which the base advances may advance in a spiral direction along the surface of the mandrel 100 based on the axial direction of the mandrel 100. In this case, each layer of GRP pipe may be stacked on top of the advancing base. Further, in one example, when each layer of the GRP pipe is laminated on the base and then cured, the base may be separated from the GRP pipe.

In addition, the liner layer forming unit 300 may laminate a liner layer included in the GRP pipe. Specifically, the liner layer forming unit 300 may laminate a liner layer on the upper portion of the base advancing along the surface of the mandrel 100 . Here, the liner layer may refer to a layer for securing watertightness against an initial water pressure when a completed GRP pipe is used according to an embodiment.

In addition, the liner layer forming unit 300 may provide a circumferential reinforcing member constituting the liner layer. Here, the circumferential reinforcing material may mean a material for increasing the strength of the liner layer constituting the GRP pipe, such as glass fiber, and glass fiber is taken as an example, but it can mean various reinforcing materials that are easy for those skilled in the art. It will be understood.

The liner layer forming unit 300 may provide a circumferential reinforcement to the base. Specifically, the method of providing the circumferential reinforcement by the liner layer forming unit 300 may include a continuous or non-continuous filament winding method. Here, the non-continuous filament winding method adjusts the speed at which a reinforcing material such as glass fiber is moved on a mandrel in various axial directions such as 2-axis, 3-axis, 4-axis, or 5-axis, so that the glass fiber is wound on the base. can mean doing In addition, the continuous filament winding method may refer to a method of impregnating a reinforcing material and a resin in a circumferential direction, applying to a mandrel, and curing at room temperature or high temperature.

In addition, the liner layer forming unit 300 may provide a multi-directional reinforcing material constituting the liner layer. Here, the multidirectional reinforcing material may mean a material obtained by cutting a specific material. For example, the multidirectional reinforcing material may include glass chops (or chopped strands) formed by cutting glass fibers. In addition, the liner layer forming unit 300 may store pre-cut multidirectional reinforcing materials and apply them on the top of the base, or cut raw materials such as glass fibers to form multidirectional reinforcing materials in real time and apply them on the top of the base. may be The applied multidirectional reinforcing material may constitute a liner layer by being impregnated with a resin together with glass fibers. That is, in other words, the liner layer forming unit 300 may apply the multidirectional stiffener to the upper part of the base, and through this, the circumferential stiffener and the multidirectional stiffener may be impregnated with the resin to form a liner layer. As the multi-directional reinforcing material is included in the liner layer, strength and watertightness of the liner layer may be improved compared to conventional ones.

Also, as an example, the liner layer forming unit 300 may not inject the multidirectional reinforcing material into the upper part of the base in a specific direction, but may inject the multidirectional reinforcing material into the upper part of the base without directionality. Meanwhile, in the past, there has been a technology in which an inclined direction reinforcement member is formed in an oblique direction within a liner layer without a multidirectional reinforcement member. However, in this case, since the strength is increased only in the oblique direction, the strength cannot be increased in other directions. However, as the multi-directional reinforcing material is introduced without directionality in the liner layer forming unit 300, strength and watertightness of the liner layer may be improved in all directions as well as in an oblique direction.

Of course, according to the embodiment, the liner layer forming unit 300 may apply a multi-directional reinforcing material to the upper part of the base in a specific direction.

Also, according to the embodiment, in the present invention, the liner layer forming unit 300 may inject a multi-directional reinforcing material and other axial reinforcing materials into the liner layer.

In addition, the liner layer forming unit 300 may apply resin. Through this, the multidirectional stiffener and the circumferential stiffener on the upper part of the base can be impregnated with each other.

In addition, the structure layer forming unit 400 may laminate structure layers included in the GRP pipe. The structural layer according to an embodiment may serve to secure safety against external pressure and internal pressure when the GRP pipe is used in an industrial field. Here, the structural layer according to an embodiment may include an inner layer, a core layer, and/or an outer layer, and a detailed description of each layer will be described later.

The structure layer forming unit 400 may form a structure layer by injecting a circumferential reinforcement material, a multidirectional reinforcement material, and a resin onto the liner layer.

In addition, as described in the liner layer forming unit 300, the structural layer forming unit 400 may improve the strength of the structural layer in various directions by introducing the multi-directional reinforcing material without direction. On the other hand, in the past, there has been a technology in which an inclined direction reinforcement member is formed in an oblique direction within a structural layer without a multidirectional reinforcement member. However, in this case, since the strength is increased only in the oblique direction, the strength cannot be increased in other directions. However, as the multi-directional reinforcing materials are introduced without directionality in the structure layer forming unit 400, the strength of the structure layer can be improved in all directions, not just the oblique direction.

Of course, according to embodiments, the structural layer forming unit 400 may inject multi-directional reinforcing materials in a specific direction. Further, according to embodiments, in the present invention, the structural layer forming unit 400 may also input multi-directional reinforcing materials and other axial reinforcing materials.

In addition, the structure layer forming unit 400 may apply a material such as sand on the liner layer. Through this, circumferential reinforcement, multidirectional reinforcement and/or sand can be impregnated with the resin to constitute the structural layer. However, it will be understood that auxiliary materials such as sand are not necessarily added here, and may or may not be added depending on the performance or specifications of the GRP pipe required in the industrial field.

In addition, the resin provided by the liner layer forming unit 300 and the structural layer forming unit 400 may be composed of various types of resins such as epoxy resin, unsaturated ester resin, and vinyl ester resin.

In addition, the first heating unit 500 may be positioned to be inserted into the mandrel 100. The first heating unit 500 serves to adjust the temperature of the mandrel 100 to an appropriate temperature for forming the liner layer and the structural layer. In addition, the first heating unit 500 may heat the mandrel 100 to provide a temperature for curing the liner layer to the liner layer. In one embodiment, the first heating unit 500 may heat the mandrel 100 to provide heat to the liner layer in order to control a time point at which the resin injected into the liner layer becomes a gel state. For example, after the resin of the liner layer passes through a gel state and starts curing, when the circumferential reinforcing material, multidirectional reinforcing material, and resin included in the inner layer are put on the liner layer, as layer separation occurs between the liner layer and the inner layer The durability of the GRP pipe may be reduced. In order to solve this problem, the control unit 700 controls the liner layer resin tank ( 332), and the temperature of the first heating unit 500 may be adjusted in consideration of the time when the circumferential reinforcing material, the multidirectional reinforcing material, and the resin included in the inner layer are injected onto the liner layer.

In addition, the second heating unit 600 may be adjacent to the structure layer forming unit 400 and located outside the liner layer and the structure layer. Through this, when the liner layer is formed in the liner layer forming unit 300 and the structure layer is formed in the structure layer forming unit 400, the second heating unit 600 applies heat to the liner layer and the outside of the structure layer to form a liner Layers and structural layers can be cured. When the liner layer and the structure layer are cured by the second heating unit 600, a GRP pipe may be finally created.

Also, heating temperatures of the first heating unit 500 and the second heating unit 600 may be controlled by the control unit 700 . This will be described later in more detail.

In addition, the apparatus 1 may further include at least one of a finishing unit 810, a grinding unit 820, a cutting unit 830, a mold release unit 840, and a compactor 850.

After the structure layer is laminated, the finishing unit 810 may sequentially apply the nonwoven fabric and the release film on the structure layer. Here, the layer including the nonwoven fabric and the release film sequentially applied on the structural layer can be expressed as an outer surface finishing layer. Specifically, the finishing unit 810 may first apply a nonwoven fabric on the outer layer formed by the structure layer forming unit 400 and then apply a release film on the coated nonwoven fabric. Since the multidirectional stiffener and the circumferential stiffener are applied to the top of the outer layer, the release film may not be properly applied, but the nonwoven fabric is applied first, so that the release film can be properly applied. In addition, by applying a release film on the non-woven fabric, the finished GRP pipe can be finished so that the outer appearance is smooth.

Also, the grinding unit 820 may grind the outer shape of the GRP pipe. This may be to facilitate insertion of the GRP pipe into a connector to be described later. Also, the grinding unit 820 may grind the outer shape of the GRP pipe and simultaneously mark the cut area of the GRP pipe. Then, the cutting unit 830 may perform cutting on the cut region of the marked GRP pipe. The grinding unit 820 and the cutting unit 830 will be described later in detail in the description of FIGS. 8 to 11 .

The demolding machine 840 may separate the base and the cut GRP pipe. Specifically, when the GRP pipe is cut in the device 1, the demolding machine 840 may separate the base inside the cut GRP pipe from the GRP pipe. The compactor 850 may compress and process the separated base.

2 is a diagram for explaining a base providing unit of a device according to an exemplary embodiment.

Referring to FIG. 2 , the base providing unit 200 may include a base supplying unit 210 , a base forming unit 220 and a belt 230 .

According to one embodiment, the base providing unit 200 may form a base and provide it to the mandrel 100 . Specifically, the base supply unit 210 may supply paper, which is a material for forming the base, to the base forming unit 220 . Here, one or more base supply units 210 may be provided. In addition, the number of base supply units 210 may be changed corresponding to the thickness of the base or the number of paper layers of the base. For example, when the base has three paper layers, the base supply unit 210 may be composed of three and supply paper constituting each paper layer. Here, each base supply unit 210 may include a roll shape, and may include a configuration capable of applying a bonding agent, wax, paraffin, and the like. That is, each of the base supply units 210 may supply the base to the base forming unit 220 by applying materials such as a bonding agent, wax, and paraffin to each base.

When the base supply unit 210 supplies the base to the base forming unit 220, the base forming unit 220 may form the shape of the base. Specifically, the base forming unit 220 may form one base shape (eg, a branch tube shape) using the bases supplied from the base supply unit 210 . Here, the base forming unit 220 may form a base shape using paper coated with wax, paraffin, or a bonding agent.

In addition, the base providing unit 200 may perform a release process on the base. For example, the base forming unit 220 may apply a release film on the base. That is, the base forming unit 220 may apply the release film to the uppermost layer among the various paper layers supplied from the base supplying unit 210 . Here, when the release treatment is completed on the base, the base providing unit 200 may provide a fabric such as a nonwoven fabric on the release treatment base. For example, the base forming unit 220 may apply a nonwoven fabric on the release film after the release film is applied on the base. The release film is for easy separation of layers, and if the liner layer is directly formed on the release film, it may be difficult to properly laminate the liner layer. In order to solve this problem, the base providing unit 200 may more easily laminate the liner layer by applying a nonwoven fabric on the release film. Here, as mentioned above, the layer in which the release film and the nonwoven fabric are sequentially stacked may be referred to as an inner finishing layer. That is, in other words, the base providing unit 200 may form an inner surface finishing layer on top of the base.

In addition, when the manufacturing process of the GRP pipe is completed, the base should be separated from the GRP pipe, and since a mold release process is performed on the base, separation between the base and the liner layer may be facilitated.

When the base shape is formed, the base providing unit 200 may provide the formed base to the mandrel 100 . Specifically, the belt 230 may transport the base completed in the base forming unit 220 along the surface of the mandrel 100 so as to advance in a spiral direction with respect to the central axis of the mandrel 100 . For example, in a situation where the mandrel 100 does not rotate, the belt 230 may carry the branch pipe forward while wrapping the surface of the mandrel 100 .

3 is a view for explaining a liner layer forming unit according to an exemplary embodiment.

Referring to FIG. 3 , the liner layer forming unit 300 according to an exemplary embodiment includes a liner layer circumferential reinforcement member providing unit 310, a liner layer multidirectional reinforcing member providing unit 320, and a liner layer resin providing unit 330. can include

The liner layer forming unit 300 may provide a circumferential reinforcement on the base. Specifically, the liner layer circumferential reinforcement member providing unit 310 may apply the circumferential reinforcement member on the base advancing along the surface of the mandrel 100 . Here, since the base advances in a spiral direction along the surface of the mandrel 100, when the circumferential reinforcement is applied to the base, the circumferential reinforcement can be wound on the base. Also, according to the input direction of the circumferential reinforcement, the direction of the shaft around which the circumferential reinforcement is wound can be set.

Also, in one embodiment, the control unit 700 may adjust the tex of the circumferential reinforcement provided from the liner layer circumferential reinforcement providing unit 310 in consideration of physical properties of the liner layer. For example, the control unit 700 may adjust the tex of the circumferential reinforcement provided from the liner layer circumferential reinforcement member providing unit 310 to 1200. As will be described later, the tex of the circumferential reinforcement provided from the liner layer circumferential reinforcement member providing unit 310 may be smaller than the tex of the circumferential reinforcement provided from the structural layer forming unit 400 . Accordingly, the number of circumferential reinforcements of the liner layer per reference area may be smaller than the number of circumferential reinforcements of the structural layer. This is because, as the structural layer is disposed outside the liner layer in the GRP pipe, the liner layer may serve to protect the inner layer of the structural layer. In addition, as the multi-directional reinforcing material is introduced into the liner layer of the present invention, the liner layer can play a role of securing an additional safety factor for the inner layer.

In addition, the inner layer serves to secure an additional safety factor for the inner layer, the core layer serves to secure stability against internal and external deformation, and the structural layer serves to secure stability against external pressure. there is. Also, since the liner layer serves to protect the inner layer, durability of the structural layer may be higher than that of the liner layer. Depending on the characteristics of the liner layer and the structure layer, the thickness of the liner layer may be smaller than that of the structure layer. Accordingly, the amounts of the circumferential reinforcement, the multidirectional reinforcement, and the resin input to form the liner layer may be smaller than the amounts of the circumferential reinforcement, the multidirectional reinforcement, and the resin to form the structural layer.

In addition, the thickness of the liner layer and the structural layer may be adjusted according to the required specifications of the GRP pipe. For example, in the manufacture of GRP pipes requiring high pressure resistance durability, the thicknesses of the liner layer and the inner layer may be set to be thick. Also, when the GRP pipe to be manufactured is placed in an area with a lot of impurities or sludge. The thickness of the liner layer may be set to be thick. In addition, when manufacturing a GRP pipe requiring high external pressure durability, the thickness of the core layer and the outer layer may be set to be thick.

Also, as will be described later, the shape of the multidirectional reinforcement provided by the liner layer multidirectional reinforcement providing unit 320 may be long in the longitudinal direction. For example, the multidirectional reinforcement provided by the liner layer multidirectional reinforcement providing unit 320 may have a length of 30 to 100 mm. Also, depending on embodiments, the lengths of the multidirectional reinforcing materials injected into the liner layer, the inner layer, the structural layer, and the outer layer may be the same or different.

Accordingly, while the circumferential reinforcement is introduced, the circumferential reinforcement can surround the multidirectional reinforcement, and thus the multidirectional reinforcement can be prevented from being separated from the base. That is, the circumferential stiffener can serve as a guide for the multidirectional stiffener.

In addition, the liner layer multidirectional reinforcement member providing unit 320 may provide a multidirectional reinforcement member on the base advancing along the surface of the mandrel 100 . Here, since the base advances in a spiral direction along the surface of the mandrel 100, when the multidirectional stiffener 2220 is applied to the base, the multidirectional stiffener 2220 can be applied to the entire surface of the base. Also, here, the liner layer multidirectional reinforcing material providing unit 320 may cut a reinforcing material such as glass fiber to form the multidirectional reinforcing material 2220 and then provide the multidirectional reinforcing material 2220 formed on the base, or may provide the multidirectional reinforcing material 2220 on the base in advance. By storing the directional stiffeners 2220, the stored multi-directional stiffeners 2220 may be provided on the base.

In addition, the liner layer multidirectional reinforcement providing unit 320 may further include a multidirectional reinforcement collecting unit (not shown). When the multidirectional stiffeners are input from the liner layer multidirectional stiffener providing unit 320, most of the multidirectional stiffeners are impregnated by the circumferential stiffeners and resin on the base, but some of the multidirectional stiffeners may be released without being impregnated on the base. can The multidirectional stiffener collection part is located at the bottom of the base. It is possible to collect multi-directional stiffeners that break away on the base. The multidirectional stiffeners collected in the multidirectional stiffener collection unit can be recycled or discarded.

In addition, according to the embodiment, the multidirectional stiffener collection unit is input from the inner layer multidirectional stiffener providing unit 420, the core layer multidirectional stiffener providing unit 440, and/or the outer layer multidirectional stiffener providing unit 460, which will be described later. Among the directional stiffeners, multidirectional stiffeners separated from the GRP pipe may be collected. in this case. The multidirectional reinforcement collection unit is physically divided into a liner layer multidirectional reinforcement supply unit 320, an inner layer multidirectional reinforcement supply unit 420, a core layer multidirectional reinforcement supply unit 440 and/or an outer layer multidirectional reinforcement supply unit ( 460) It may be arranged in a position corresponding to each, or may be physically implemented as one.

In addition, the liner layer resin providing unit 330 may apply resin on the base advancing along the surface of the mandrel 100 . Here, due to the resin, the circumferential reinforcement and the multidirectional reinforcement can be impregnated with each other. Also here, since the base is advancing in a spiral direction along the surface of the mandrel 100, the circumferential stiffener, the multidirectional stiffener, and the resin can be impregnated and advanced into each other on top of the base.

Also, in one embodiment, the liner layer resin supply unit 330 may include a liner layer resin input unit 331 and a liner layer resin tank 332 . Resin provided for the liner layer may be accommodated in the liner layer resin tank 332 , and the liner layer resin injection unit may inject the resin contained in the liner layer resin tank 332 onto the base.

Also, in one embodiment, the controller 700 may control the temperature of the resin contained in the liner layer resin tank 332 . This may be to minimize bubbles and cracks that may occur depending on the temperature of the resin, and improve the impregnation performance of the circumferential reinforcement and the multidirectional reinforcement. If the temperature of the resin is too high, as the viscosity of the resin decreases and the fluidity increases, the amount of the resin released out of the mandrel increases, and accordingly, the required amount of resin may not be impregnated into the liner layer. In addition, as the curing speed of the resin increases, the resin is not impregnated in the liner layer, and the possibility of bubbles and cracks occurring in the resin may increase. In addition, if the temperature of the resin is too low, the required amount of resin may not be impregnated into the liner layer as the viscosity of the resin increases and the fluidity decreases. In addition, as the curing rate of the resin slows down, impregnation performance of the circumferential reinforcement and the multidirectional reinforcement into the resin may decrease, and the possibility that the resin may be uncured may increase. Accordingly, as described above, the circumferential reinforcing material, the multidirectional reinforcing material, and the resin of the inner layer may be put on the liner layer before the resin becomes a gel, and as a result, layer separation between the liner layer and the inner layer may occur. . In addition, the temperature of the resin may vary depending on the external environment (eg, season), and this causes the impregnation performance of the circumferential reinforcement and the multidirectional reinforcement to change along with the possibility of bubbles and cracks, thereby changing the GRP pipe depending on the season. quality may vary. To solve this problem, the controller 700 may control the temperature of the resin contained in the liner layer resin tank 3320 to an appropriate temperature. For example, the controller 700 may control the temperature of the resin contained in the liner layer resin tank 332 to 20 degrees to 25 degrees. This may be for the control unit 700 to control the time when the resin of the liner layer becomes a gel state by adjusting the temperature of the resin contained in the liner layer resin tank 332 to be robust against temperature changes according to the season. In addition, the controller 700 may control the temperature of the resin stored in the structure layer resin tank 482 to be 20 to 30 degrees.

In addition, the controller 700 may control the temperature of the resin contained in the liner layer resin tank 332 in consideration of the type of resin and the content of the curing agent. Referring to FIG. 4, FIG. 4 is a view showing a curing curve according to the type of resin and the content of the curing agent according to an embodiment.

Referring to Figure 4, (A) shows the curing curve of the resin with temperature and time when the resin is CW-135 (S) and the curing agent is contained 1.0%, (B) is the resin CW-135 ( S), and a curing curve according to the initial temperature and time of the resin when 1.8% of the curing agent is contained may be shown. In addition, (C) shows the curing curve according to the temperature and time of the resin when the resin is CW-135 (M) and the curing agent is contained 1.0%, (D) is the resin is CW-135 (M), A curing curve according to the temperature and time of the resin when 1.8% of the curing agent is contained can be shown.

In (A) to (D), it can be seen that the time for resins having different initial temperatures to reach the highest temperature over time, that is, the slope of the graph until reaching the highest temperature is different. In each graph, the fact that the resin reaches the highest temperature may mean that the resin is cured. In addition, it can be understood that the point in time before the slope of each graph sharply rises is the point in time when the resin becomes clear. Accordingly, the time at which the resin becomes a gel state may vary depending on the type of resin, the initial temperature of the resin, and the content of the curing agent.

More specifically, in (A), the resin when the initial temperature is 25 degrees reaches the gel state in about 18 minutes, and in (B), the resin when the initial temperature is 25 degrees reaches the gel state in about 10 minutes. can Further, in (C), the resin when the initial temperature is 25 degrees reaches a gel state in about 20 minutes, and in (D), the resin when the initial temperature is 25 degrees can reach a gel state in about 13 minutes. there is. As such, even when the resins have the same initial temperature, the time to reach the gel state may be different depending on the type of resin and the amount of the curing agent included in the resin. Accordingly, the time for curing the resin and the time of the resin Impregnation properties may also vary. Accordingly, the controller 700 may adjust the temperature of the liner layer resin tank 332 in consideration of the type of resin, the content of the curing agent, and the processing time of the GRP pipe.

Also, as described above, the thickness of the liner layer may be less than that of the structural layer. As the thickness of the liner layer is relatively thin, when the liner layer is cured at an excessively high speed, impregnation of the circumferential reinforcement and the multidirectional reinforcement may not proceed smoothly. Accordingly, the control unit 700 may control the content of the curing agent provided to the resin accommodated in the liner layer resin tank 332 to be less than the content of the curing agent provided to the resin accommodated in the structural layer resin tank 482 of FIG. 6 . can For example, the content of the curing agent provided to the resin accommodated in the liner layer resin tank 332 and the content of the curing agent provided to the resin accommodated in the structural layer resin tank 482 may be set to a predetermined standard (eg, 1.0% to 2.5%). %, which can be changed according to the required specifications of GRP pipe). At this time, since the resin of the liner layer is directly affected by the heat provided from the first heating unit 500, the content of the curing agent provided to the resin accommodated in the liner layer resin tank 332 is within the predetermined standard. may be relatively less than the content of the curing agent provided to the resin accommodated in the structure layer resin tank 482. Of course, according to the embodiment, the controller 700 determines that the content of the curing agent provided to the resin accommodated in the liner layer resin tank 332 and the content of the curing agent provided to the resin accommodated in the structural layer resin tank 482 are the same. may be

In addition, the liner layer forming unit 300 first inputs the circumferential reinforcing material from the liner layer circumferential direction reinforcing material supply unit 310, then discharges the resin from the liner layer resin dispensing unit 331, and then discharges the liner layer multidirectional reinforcing material. The provision unit 320 may input multi-directional reinforcing materials. Accordingly, the multidirectional reinforcing material is put on the circumferential reinforcing material so that the circumferential reinforcing material surrounds the multidirectional reinforcing material, thereby increasing bonding strength and resin impregnability and reducing loss of the multidirectional reinforcing material. In addition, by constituting the liner layer by combining the multi-directional stiffeners between the circumferential stiffeners, there is an effect of increasing strength and safety of the liner layer in multi-directional and circumferential directions. Also, the resin and the multidirectional reinforcing material may be put in substantially simultaneously.

Also, according to embodiments, the liner layer forming unit 300 may inject resin, circumferential reinforcing materials, and/or multidirectional reinforcing materials in various orders.

For example, when resin is applied on the base by the liner layer resin providing unit 330, the circumferential reinforcing material is applied on the resin applied by the liner layer circumferential reinforcing material providing unit 310, and the applied resin and the circumferential reinforcing material are applied. On the liner layer, the multidirectional reinforcing material providing unit 320 may provide the multidirectional reinforcing material.

As another example, the liner layer resin providing unit 330, the liner layer circumferential reinforcement material providing unit 310, and/or the liner layer multidirectional reinforcement material providing unit 320 simultaneously supplies the resin, the circumferential reinforcement material, and/or the multidirectional reinforcement material to the base. Can be applied on top.

As another example, after the resin is applied to the base in the liner layer resin providing unit 330, the circumferential reinforcing material providing unit 310 for the liner layer and the multidirectional reinforcing material providing unit 320 for the liner layer simultaneously apply the circumferential reinforcing material and the multidirectional reinforcing material in the liner layer 320. Reinforcements can be applied on the base.

As another example, the resin may be applied on the base in the liner layer forming unit 300 after the circumferential reinforcement and/or the multidirectional reinforcement have been applied in advance.

5 is a view for explaining a first heating unit according to an embodiment.

Referring to FIG. 5 , the first heating unit 500 may include a heating unit 510 and a heat providing unit 520 .

As described above, the first heating unit 500 may be disposed inside the mandrel 100 . If the heater is disposed only on the outside of the mandrel 100, the thermal efficiency is low, and heat is directly applied to the outer surface of the liner layer, making it difficult for heat to be transmitted throughout the circular liner layer, thereby partially curing may occur, or the properties of the resin may be altered. Accordingly, the first heating unit 500 may be disposed inside the mandrel 100 to provide uniform heat to the entire mandrel 100 and the entire inner surface of the liner layer.

In one embodiment, the size and length of the heat providing unit 520 may correspond to the size and length of the mandrel 100 . This may be to ensure that heat provided from the heat providing unit 520 uniformly reaches the entire inner surface of the liner layer. In addition, the heat providing unit 520 and the mandrel 100 may be thermally connected. For example, the heat providing unit 520 and the mandrel 100 may be in direct contact, or a medium may exist between the heat providing unit 520 and the mandrel 100 .

Also, the heating unit 510 and the heat providing unit 520 may be interlocked, and the heating unit 510 may heat air inside the heat providing unit 520 . The air whose temperature is raised by the heating unit 510 is dispersed inside the heat providing unit 520, so that the overall temperature of the heat providing unit 520 may rise, and as the temperature of the heat providing unit 520 rises, Accordingly, the temperature of the mandrel 100 thermally connected to the heat providing unit 520 may also rise. As the temperature of the mandrel 100 is increased by the heat providing unit 520, heat may be uniformly provided to the inner surface of the liner layer disposed on the mandrel 100.

Also, the controller 700 described above may control the heating unit 510 to control the temperature of the heat provided from the heat providing unit 520 .

Specifically, the heat provided from the heat providing unit 520 is for curing the resin of the liner layer, and the curing speed and generated air bubbles depend on the type of resin, the content of the curing agent contained in the resin, and the temperature of the heat provided to the resin. The amount, hardness, etc. may vary.

In one embodiment, the controller 700 may control the temperature of the heat providing unit 520 higher than the temperature of the resin provided from the liner layer forming unit 300 . For example, when the initial temperature of the resin provided from the liner layer forming unit 300 is 20 to 25 degrees, the control unit 700 sets the heat providing unit to 35 to 45 degrees higher than the initial temperature of the resin by about 10 degrees or more ( 520) can be controlled. As the heat provided by the first heating unit 500 is higher than the temperature of the resin provided from the liner layer forming unit 300, the time at which the resin of the liner layer becomes a gel state may be shortened. In addition, the control unit 700 may improve the durability of the GRP pipe by adjusting the temperature of the heat providing unit 520 to control the time when the resin of the liner layer becomes a gel state.

Also, referring back to FIG. 1 , the device 1 may include a second heating unit 600 . The second heating unit 600 may be disposed outside and used for curing the liner layer. For example, the second heating unit 600 may be disposed at a position facing the liner layer forming unit 300 . In addition, the second heating unit 600 may be disposed between the liner layer forming unit 300 and the structure layer forming unit 400 .

In addition, the second heating unit 600 may cure the impregnated materials by heating the liner layer from the outside when the resin, the circumferential reinforcing material and/or the multidirectional reinforcing material are impregnated and applied as a whole to the upper part of the base to form a liner layer. there is.

In one embodiment, the controller 700 may control the temperature of the second heating unit 600 . For example, the controller 700 may control the temperature of the second heating unit 600 within a predetermined temperature range (eg, 110 degrees to 150 degrees). At this time, the temperature of the second heating unit 600 may be higher than the temperature of the resin provided from the liner layer forming unit 300 and the temperature of the heat provided by the first heating unit 500 . This is because the heat provided from the first heating unit 500 is used to control the time when the resin of the liner layer having a relatively thin thickness is in a gel state, and the heat provided from the second heating unit 600 is used to control the liner layer and This may be because it is used for curing the structural layer.

Temperature control of the second heating unit 600 may be to achieve an optimal curing level and an optimal production rate of the liner layer. For example, the strength of the GRP pipe can be created with the desired strength only when the structural layer is formed after the liner layer is cured at a predetermined level or higher. Accordingly, the temperature of the second heating unit 600 may need to be adjusted in response to the optimal production rate of the liner layer and the target strength of the GRP pipe. If the temperature of the second heating unit 600 is too high, as the curing speed of the liner layer is excessively fast, bubbles and cracks may be generated, and interlayer separation may occur between the liner layer and the structural layer. In addition, when the temperature of the second heating unit 600 is too low, the curing speed of the liner layer is excessively slow, and as the curing of the liner layer is cured below a predetermined curing level, the physical properties of the liner layer may be deteriorated. liner layer in the process of moving the structure layer forming part 400 of the liner layer (for example, the process of moving the structure layer forming part 400 from the liner layer forming part 300 by the transport roller) Shape deformation of the liner layer, such as being pressed by the transport roller, may occur. Accordingly, the control unit 700 may control the temperature of the second heating unit 600 to a predetermined temperature range.

6 is a view for explaining a structure layer forming unit according to an exemplary embodiment.

Referring to FIG. 6 , the structural layer forming unit 400 according to an exemplary embodiment includes an inner circumferential reinforcement member providing unit 410, an inner multidirectional stiffener providing unit 420, a core layer circumferential reinforcement member providing unit 430, It may include a core layer multidirectional reinforcement member providing unit 440 , an outer layer circumferential reinforcement member providing unit 450 , an outer layer multidirectional reinforcement member providing unit 460 , a sand providing unit 470 and a resin providing unit 480 .

The structural layer may include an inner layer, a core layer, and an outer layer, and the inner layer may be formed on the liner layer, the core layer may be formed on the inner layer, and the outer layer may be formed on the core layer.

Specifically, the inner layer may perform a function of securing safety against initial internal pressure in the GRP pipe.

The inner layer circumferential reinforcement member providing unit 410 may provide a circumferential reinforcement member on the upper portion of the liner layer after the liner layer is cured at a predetermined curing level or higher. In one embodiment, the control unit 700 controls the input amount of the resin and the input amount of the multidirectional reinforcing material according to the number of tex numbers of the circumferential reinforcing material provided from the inner circumferential reinforcing material providing unit 410 in consideration of the physical properties of the inner layer. can

In one embodiment, the number of tex of the circumferential reinforcement provided by the inner layer circumferential reinforcement providing unit 410 may be adjusted to 2400 and 4400. Of course, it is not limited thereto, and the number of textures of the circumferential reinforcement may be adjusted according to the required specifications of the GRP pipe.

For example, the circumferential reinforcement provided by the inner circumferential reinforcement member providing unit 410 may include a first inner circumferential reinforcement of 2400 tex and a second inner circumferential reinforcement of 4400 tex. For example, the inner circumferential reinforcement providing unit 410 first inserts the first inner circumferential reinforcement of 2400 tex and then the second inner circumferential reinforcement of 4400 tex in order to increase the impregnation of the circumferential reinforcement. can Also, according to embodiments, the inner circumferential reinforcement member providing unit 410 may alternately inject the first inner circumferential reinforcement member and the second inner circumferential reinforcement member onto the liner layer, or simultaneously inject the first inner circumferential reinforcement member.

In addition, the tex of the circumferential reinforcement provided from the inner layer circumferential reinforcement providing unit 410 may be greater than the tex of the circumferential reinforcement provided from the liner layer circumferential reinforcement providing unit 310 . Accordingly, the number of circumferential reinforcements of the inner layer per reference area may be greater than the number of circumferential reinforcements of the liner layer. Accordingly, as described above, the durability of the structural layer may be higher than that of the liner layer.

In addition, the shape of the multidirectional reinforcement member provided by the inner layer multidirectional reinforcement member provider 420 may be long in the longitudinal direction, like the multidirectional reinforcement member provided by the liner layer multidirectional reinforcement member provider 320 . Accordingly, while the circumferential reinforcement member is introduced, the circumferential reinforcement member may cover the multidirectional reinforcement member, thereby preventing the multidirectional reinforcement member from being separated from the liner layer. That is, the circumferential stiffener can serve as a guide for the multidirectional stiffener.

In addition, the structure layer resin providing unit 480 may include a structure layer resin input unit 481 and a structure layer resin tank 482 . The resin provided for the structural layer is accommodated in the structural layer resin tank 482, and the structural layer resin injection unit 481 injects the resin contained in the structural layer resin tank 482 to form the inner layer, the core layer, and the outer layer. can In addition, although the structure layer resin providing unit 480 is expressed as one in FIG. 6, it is not limited thereto, and the structure layer resin providing unit 480 may be separated. For example, the structural layer resin providing unit 480 may be divided into an inner layer resin providing unit, a core layer resin providing unit, and an outer layer resin providing unit. Accordingly, each of the inner layer resin providing unit, the core layer resin providing unit, and the outer layer resin providing unit may include a resin input unit and a resin tank.

Also, in one embodiment, the controller 700 may control the temperature of the resin contained in the structure layer resin tank 482 . In this regard, the description of the liner layer resin providing unit 330 may be applied. For example, the controller 700 may control the temperature of the resin contained in the structure layer resin tank 482 to 20 degrees to 25 degrees. However, while the temperature control of the resin in the liner layer resin tank 332 is to control the time when the resin of the liner layer becomes a gel state, the temperature control of the resin in the structure layer resin tank 482 is to control the temperature of the resin in the structure layer. It may be to control the time point at which the resin is cured.

Also, according to the embodiment, the structural layer resin providing unit 480 may inject resin to form the inner layer, the core layer, and the outer layer, and the control unit 700 considers the physical properties of the inner layer, the core layer, and the outer layer to form the structure. The temperature of the resin contained in the layered resin tank 482 may be adjusted. Depending on circumstances, the temperature of the resin for forming the inner layer, the temperature of the resin for forming the core layer, and the temperature of the resin for forming the outer layer may be different.

Also, as described above, the curing agent content of the resin contained in the structural layer resin tank 382 may be higher than that of the resin contained in the liner layer resin tank 332 within the predetermined criteria. This is because the thickness of the liner layer is thicker than that of the structural layer, and the liner layer can be more affected by the heat provided from the first heating unit 500 than the structural layer.

Of course, depending on the embodiment, the resin contained in the structure layer resin tank 382 and the resin contained in the liner layer resin tank 332 may be the same or different in type and/or content of the curing agent.

In one embodiment, in order to form the inner layer, the circumferential reinforcement is first introduced in the inner layer circumferential reinforcement member providing unit 410, then the resin is injected in the structural layer resin providing unit 480, and the inner layer multidirectional reinforcement material is injected. In the study 420, a multi-directional reinforcing material may be introduced. Accordingly, the multidirectional reinforcing material is put on the circumferential reinforcing material so that the circumferential reinforcing material surrounds the multidirectional reinforcing material, thereby increasing bonding strength and resin impregnability and reducing loss of the multidirectional reinforcing material. In addition, since the multidirectional stiffeners are combined between the circumferential stiffeners to form the inner layer, the strength and safety of the inner layer in multidirectional and circumferential directions are increased. Also, the resin and the multidirectional reinforcing material may be put in substantially simultaneously.

Also, according to embodiments, similarly to what has been described with respect to the liner layer forming unit 300, the structural layer forming unit 400 supplies resin, circumferential reinforcement, and/or multidirectional reinforcement in various orders to form the inner layer. can be put in

In addition, the core layer may be formed at the center of the GRP pipe to improve stability against external pressure. In the case of the core layer, unlike the inner layer or the outer layer, sand may be further included.

The core layer circumferential reinforcement member providing unit 430 may provide a circumferential reinforcement member on the upper portion of the inner layer. At this time, the core layer circumferential reinforcement member providing unit 430 may provide the circumferential reinforcement member to the upper portion of the inner layer after the inner layer has been cured to a predetermined curing level or higher. In addition, the controller 700 may adjust the texture of the circumferential reinforcement member provided from the core layer circumferential reinforcement member 430 in consideration of the physical properties of the core layer. For example, the control unit 700 may adjust the tex of the circumferential reinforcement provided from the core layer circumferential reinforcement member providing unit 430 to 2400 and 4400, respectively. Regarding the adjustment of the tex of the circumferential reinforcement in the core layer circumferential reinforcement 430, the description of the adjustment of the tex of the circumferential reinforcement in the inner circumferential reinforcement providing unit 410 may be applied. Of course, as the controller 700 considers the physical properties of the core layer, the tex of the circumferential reinforcement in the core layer circumferential reinforcement 430 is different from the tex of the circumferential reinforcement in the inner circumferential reinforcement providing unit 410. can be adjusted differently.

In addition, the shape of the multidirectional reinforcing member provided in the core layer multidirectional reinforcing member 440 may be long in the longitudinal direction, like the multidirectional reinforcing member provided in the inner layer multidirectional reinforcing member providing part 420 . Accordingly, while the circumferential reinforcement member is introduced, the circumferential reinforcement member may cover the multidirectional reinforcement member, thereby preventing the multidirectional reinforcement member from being separated from the liner layer. That is, the circumferential stiffener can serve as a guide for the multidirectional stiffener.

Also, the sand providing unit 470 may provide sand on the inner layer. In one embodiment, the sand providing unit 470 may include a sand inputting unit 471 and a sand receiving unit 472 . The sand inlet 471 may inject sand received in the sand accommodating unit 472 . At this time, the sand injection unit 471 may inject sand into the upper part of the inner layer without directionality. As the multidirectional reinforcing material and the sand are provided to the core layer without orientation, the core layer can have improved strength in all directions overall without orientation.

Also, the sand accommodating unit 472 may accommodate sand used for forming the core layer. At this time, the control unit 700 may control the temperature of the sand accommodated in the sand accommodating unit 472 . In the case of sand, the temperature may vary depending on the external environment (eg, season). Depending on the temperature of the sand, the possibility of bubbles and cracks and the performance of impregnating the resin may vary. This is because the temperature of the resin can also be changed as the sand is put into the core layer as a whole. For example, when the temperature of the sand is too low, the amount of sand released from the core layer may increase as the impregnation rate and impregnation performance of the sand into the resin decrease. In addition, as the temperature of the resin is lowered, the impregnation rate and impregnation performance of the circumferential reinforcing material and the multidirectional reinforcing material in the core layer are reduced, so that the amount of the multidirectional reinforcing material separating from the core layer may also be increased.

In addition, when the temperature of the sand is too high, the possibility of bubbles and cracks occurring in the resin due to the hot sand may increase. In addition, as the temperature of the resin increases, the rate of impregnation of the circumferential reinforcing material and the multidirectional reinforcing material in the core layer increases and the impregnation time decreases, so that the amount of the multidirectional reinforcing material separated from the core layer may increase.

In order to solve this problem, the control unit 700 may control the temperature of the sand accommodated in the sand receiving unit 472 to an appropriate temperature. For example, the control unit 700 may control the temperature of the sand accommodated in the sand accommodating unit 472 to be equal to or higher than the initial temperature of the resin. For example, the control unit 700 may control the temperature of the sand accommodated in the sand accommodating unit 472 to between 25 degrees and 35 degrees.

In addition, heat provided from the first heating unit 500 may not be transferred to the core layer by the liner layer and the inner layer, or only a small amount of heat may be transferred to the core layer. In addition, as described above, the temperature of the resin changes as the sand is entirely introduced onto the core layer, and the temperature of the sand may be higher than the initial temperature of the resin. Accordingly, the curing of the resin of the core layer may be more affected by the temperature of the sand than the first heating unit 500, and this may be expressed as the first post-curing of the core layer. According to the first post-curing of the core layer according to the temperature of the sand, the generation of bubbles and cracks in the core layer is reduced, the impregnation performance of circumferential reinforcement, multidirectional reinforcement and sand into resin is improved, and the production speed of GRP pipes is improved. Impregnation performance into the resin can be adjusted accordingly.

In addition, the structural layer resin providing unit 480 may provide resin on the inner layer to form the core layer. For the operation of the structure layer resin providing unit 480 in the core layer, the description of the structure layer resin providing unit 480 described in the process of forming the inner layer may be applied.

In addition, in one embodiment, in order to form the core layer, the circumferential reinforcement is first introduced in the core layer circumferential reinforcement member providing unit 430, and then the multidirectional reinforcement is input in the core layer multidirectional reinforcement member providing unit 440. After being injected, the sand is injected in the sand providing unit 470, and then the resin may be applied on the circumferential direction reinforcing material, the multidirectional reinforcing material, and the sand in the structure layer resin providing unit 480. Accordingly, the multidirectional stiffener and the sand are put on the circumferential reinforcement so that the circumferential reinforcement covers the multidirectional reinforcement and the sand, thereby increasing the bonding strength and resin impregnability and reducing the loss of the multidirectional reinforcement and the sand. can In addition, by constituting a core layer by combining multidirectional reinforcing materials and sand between circumferential reinforcing materials, there is an effect of increasing strength and safety of the core layer in multidirectional and circumferential directions.

Also, according to an embodiment, the structural layer forming unit 400 may inject a circumferential reinforcement material, then a resin, and then sand and multidirectional reinforcement materials. Further, according to the embodiment, sand may be introduced first and then the multidirectional reinforcing material may be input, or the sand and the multidirectional reinforcing material may be simultaneously inputted. Accordingly, the sand and the multidirectional stiffener are put on the circumferential reinforcement so that the circumferential reinforcement covers the sand and the multidirectional reinforcement, thereby increasing the bonding strength and resin impregnability and reducing the loss of the sand and the multidirectional reinforcement. can In addition, by combining sand and multidirectional reinforcing materials between circumferential reinforcing materials to form a core layer, there is an effect of increasing strength and safety of the liner layer in multidirectional and circumferential directions. Also, the resin, sand, and multi-directional reinforcing material may be input substantially simultaneously. Of course, it is not limited thereto, and according to embodiments, similarly to the description of the liner layer forming unit 300, the structural layer forming unit 400 includes a resin, a circumferential reinforcing material, a multidirectional reinforcing material, and a resin in order to form a core layer. /or the sand can be added in a variety of sequences.

In addition, the outer layer may perform a function of securing stability against external pressure and internal pressure when the GRP pipe is used in the field.

The outer layer circumferential reinforcement member providing unit 450 may provide a circumferential reinforcement member over the core layer. In this case, the outer layer circumferential reinforcement member providing unit 450 may provide the circumferential reinforcement member on the upper part of the core layer after the core layer has been cured to a predetermined curing level or higher. In addition, the controller 700 may adjust the texture of the circumferential reinforcement provided from the outer circumferential reinforcement 450 in consideration of physical properties of the outer layer. For example, the control unit 700 may adjust the tex of the circumferential reinforcement provided from the outer circumferential reinforcement providing unit 450 to 2400 and 4400, respectively. Regarding the adjustment of the tex of the circumferential reinforcement member in the outer circumferential reinforcement member provider 450, the description of the control of the circumferential reinforcement member in the inner circumferential reinforcement member provider 410 may be applied. Of course, as the controller 700 considers the physical properties of the outer layer, the outer layer circumferential reinforcement is different from the texture of the circumferential reinforcement in the inner circumferential reinforcement provider 410 and/or the core layer circumferential reinforcement provider 430. The texture of the circumferential stiffener in the provision unit 450 may be adjusted differently.

Also, the shape of the multidirectional reinforcing member provided in the outer layer multidirectional reinforcing member 460 may be long in the longitudinal direction, like the multidirectional reinforcing member provided in the inner layer multidirectional reinforcing member providing unit 420 . Accordingly, while the circumferential reinforcement is introduced, the circumferential reinforcement can surround the multidirectional reinforcement, thereby preventing the multidirectional reinforcement from being separated from the outer layer. That is, the circumferential stiffener can serve as a guide for the multidirectional stiffener.

In addition, in one embodiment, the liner layer multidirectional reinforcement member providing unit 320, the inner layer multidirectional reinforcement member providing unit 420, the core layer multidirectional reinforcement member providing unit 440, and the outer layer multidirectional reinforcement member providing unit described above with reference to FIG. 3 The content of the multi-directional reinforcing material provided in 460 may be adjusted in consideration of the physical properties of the GRP pipe.

Specifically, Table 1 below shows the tensile strength and flexural strength of the layer when the content ratio of the multidirectional stiffener to the weight of the circumferential stiffener injected into each layer is set differently in the layer composed of the circumferential stiffener, the multidirectional stiffener, and the resin. This is the experimental data showing

In Table 1, the test for tensile strength was performed according to the test method of KS M ISO 8513 / ASTM D 638 / ISO 527-4, 5, and the test for flexural strength was performed according to the test method of ASTM D 790.

As shown in Table 1, the tensile strength shows the highest value when the content ratio of the multidirectional reinforcement is 20%, and the flexural strength shows the highest value when the content ratio of the multidirectional reinforcement is 15%. Accordingly, in general, since tensile strength and flexural strength are important physical properties for performance of GRP pipes, the liner layer multidirectional reinforcing material providing unit 320, the inner layer multidirectional reinforcing material providing unit 420, and the core layer multidirectional reinforcing material providing unit The content ratio of the multidirectional reinforcing materials provided by the multidirectional reinforcing material 440 and the outer layer multidirectional reinforcing material providing unit 460 may be adjusted within 15% to 20%. Of course, according to the embodiment, when manufacturing GRP pipes in which tensile strength is more important, the content ratio of multidirectional reinforcing materials provided in each layer is set to 20%, and in manufacturing GRP pipes in which flexural strength is more important, each layer provides The content ratio of the multidirectional reinforcing material to be can be set to 15%. In addition, according to the embodiment, provided by the liner layer multidirectional reinforcement member providing unit 320, the inner layer multidirectional reinforcement member providing unit 420, the core layer multidirectional reinforcement member providing unit 440, and the outer layer multidirectional reinforcement member providing unit 460. The content ratio of the multidirectional reinforcing material may be controlled by the control unit 700.

In addition, the structural layer resin providing unit 480 may provide resin on the core layer to form the outer layer. For the operation of the structure layer resin providing unit 480 in the outer layer, the description of the structure layer resin providing unit 480 described in the process of forming the inner layer may be applied.

In addition, in one embodiment, in order to form the outer layer, the circumferential reinforcement is first injected in the outer circumferential reinforcement member providing unit 450, and then the resin is injected in the structural layer resin providing unit 480, and the outer layer is multi-directional. In the reinforcing material 460, multi-directional reinforcing materials may be introduced. Accordingly, the multidirectional reinforcing material is put on the circumferential reinforcing material so that the circumferential reinforcing material surrounds the multidirectional reinforcing material, thereby increasing bonding strength and resin impregnability and reducing loss of the multidirectional reinforcing material. In addition, multidirectional stiffeners are combined between circumferential stiffeners to form the outer layer, thereby increasing strength and safety of the outer layer in multidirectional and circumferential directions. Also, the resin and the multidirectional reinforcing material may be put in substantially simultaneously.

Also, according to embodiments, similarly to what has been described with respect to the liner layer forming unit 300, the structural layer forming unit 400 supplies resin, circumferential reinforcement, and/or multidirectional reinforcement in various orders to form an outer layer. can be put in

Also, referring back to FIG. 1 , the above-described second heating unit 600 may be disposed outside and used for curing the structural layer. In addition, when the second heating unit 600 is impregnated with resin, circumferential reinforcement, multidirectional reinforcement, and/or sand to sequentially form an inner layer, a core layer, and an outer layer on the liner layer, the inner layer, core layer, and outer layer are formed on the outside. The inner layer, the core layer, and the outer layer may be sequentially cured by heating.

In one embodiment, the controller 700 may control the temperature of the second heating unit 600 . For example, the controller 700 may control the temperature of the second heating unit 600 within a predetermined temperature range (eg, 110 degrees to 150 degrees). At this time, the temperature of the second heating unit 600 may be higher than the temperature of the resin provided from the structure layer forming unit 400 . Also, the temperature of the second heating unit 600 may be higher than the temperature of sand provided for forming the core layer. Accordingly, the heat provided by the second heating unit 600 may be used for curing from the outer surfaces of the inner layer, the core layer, and the outer layer. In particular, in the case of the core layer, as described above, after the first post-curing is performed on the inner surface of the core layer by sand, as the outer surface of the core layer is cured by the heat provided by the second heating unit 600, Curing by heat provided by the second heating unit 600 in the core layer may be expressed as secondary post-curing of the core layer.

The temperature control of the second heating unit 600 may be to achieve an optimal curing level and an optimal production rate of the structural layer. For example, the core layer is formed after the inner layer is cured at a predetermined curing level or higher, and the outer layer is formed after the core layer is cured at a predetermined curing level or higher to achieve the desired strength of the GRP pipe. Accordingly, the temperature of the second heating unit 600 may need to be adjusted in response to the optimal production rate of the structural layer and the target strength of the GRP pipe.

If the temperature of the second heating unit 600 is too high, as the curing speed of the structural layer is excessively fast, bubbles and cracks are generated, and interlayer separation may occur between the inner layer, the core layer, and the outer layer. . In addition, if the temperature of the second heating unit 600 is too low, the curing speed of the structural layer is excessively slowed, and as the curing of the structural layer is cured below a predetermined curing level, physical properties of the structural layer may be deteriorated. In the process of moving the inner layer and the core layer (for example, the process of moving the inner layer and the core layer by the transport roller), the shape deformation of the structural layer may occur, such as the inner layer and the core layer being pressed by the transport roller. can Accordingly, the control unit 700 may control the temperature of the second heating unit 600 to a predetermined temperature range.

In addition, the control unit 700 considers the physical properties of the liner layer, the inner layer, the core layer, and the outer layer, the temperature of the second heating unit 600 in the liner layer forming process, and the second heating unit 600 in the inner layer forming process. The temperature of the temperature of the second heating unit 600 in the inner layer formation process in the core layer formation process and the temperature of the second heating unit 600 in the inner layer formation process in the outer layer formation process are different from each other can also be adjusted.

7 is a view showing a layer structure of a completed GRP pipe according to an embodiment.

Referring to FIG. 7 , a GRP pipe according to an embodiment may include a liner layer 4 , a structural layer 5 , an inner finishing layer 9 and an outer finishing layer 10 . Specifically, the structural layer 5 may include an inner layer 6 , a core layer 7 , and an outer layer 8 , respectively.

According to one embodiment, the liner layer 4 may include a circumferential reinforcing material, a multidirectional reinforcing material, and a resin. In addition, the liner layer 4 may be subjected to a release treatment to facilitate separation from the base. The liner layer 4 is formed on the innermost side of the GRP pipe to protect the core layer 7 and the structural layer 5, and to improve the safety of the GRP pipe from pressure resistance.

In the case of the inner layer 6, it may include circumferential stiffeners, multidirectional stiffeners, and resins. An inner layer 6 may be formed over the liner layer 4 . The inner layer 6 serves to protect the core layer 7 and improve stability against internal pressure and external pressure.

In the case of the core layer 7, a circumferential reinforcing material, a multidirectional reinforcing material, sand, and resin may be included. The core layer 7 may be formed on the inner layer 6 . The core layer 7 is formed at the center of the GRP pipe to improve stability against external pressure.

The outer layer 8 may include circumferential stiffeners, multidirectional stiffeners and resins. The outer layer 8 is formed on the core layer 7 and is formed on the outermost part of the GRP pipe to protect the GRP pipe including the core layer from the outside.

The inner finishing layer 9 may be formed under the liner layer 4 . The inner finishing layer 9 is formed on the upper part of the base and may include a non-woven fabric and a release film. The release film is formed on the innermost side of the GRP pipe to be in contact with the base, and performs a function of facilitating separation of the base and the GRP pipe after the GRP pipe is completed.

The outer finishing layer 10 may be formed on top of the outer layer 8 . The outer finishing layer 10 may be formed on the outermost side of the GRP pipe. In addition, the outer finishing layer 10 may include a non-woven fabric and a release film. Specifically, as described above, the nonwoven fabric is applied to the top of the outer layer 8, and the release film is applied and formed on the nonwoven fabric, thereby making the outer surface of the GRP pipe smooth.

8 is a view for explaining a connector according to an embodiment.

Referring to FIG. 8 , FIG. 8 shows a cross-sectional side view of the connector 1000 . The connector 1000 may include a straight pipe 1100 and a first water sealing member 1200, a second water sealing member 1300, and a stopper 1400 included in the straight pipe. Here, the straight pipe 1100 may be the aforementioned GRP pipe or another pipe. In addition, the first GRP pipe 2A and the second GRP pipe 2B may be inserted into the connector 1000 . At this time, the first GRP pipe 2A and the second GRP pipe 2B are disposed with the stopper 1400 interposed therebetween, and the first GRP pipe 2A is in contact with the first water-milling member 1200, The second GRP pipe 2B may be in contact with the second water-tight member 1300 . The first GRP pipe 2A and the second GRP pipe 2B are inserted from the outside to the inside of the connector 1000, and the first water-milling member 1200 and the second water-milling member 1300 may have protrusions. there is. The protrusion can prevent the first GRP pipe 2A and the second GRP pipe 2B from being separated from the connector 1000 and preventing foreign substances from being inserted into the connector 1000 from the outside. However, it may be difficult to insert the connector 1000 of the first GRP pipe 2A and the second GRP pipe 2B due to the protrusion. Accordingly, in the present specification, by grinding the outer surfaces of the first GRP pipe 2A and the second GRP pipe 2B in consideration of the protrusions of the first water-milling member 1200 and the second water-milling member 1300, A method for easily inserting the first water-tight member 1200 and the second water-tight member 1300 into the connector 1000 is proposed.

9 is a view for explaining a grinding part and a cutting part according to an embodiment.

Referring to FIG. 9 , the grinding unit 820 and the cutting unit 830 may be disposed at opposite positions. In addition, the device 1 may further include a transfer unit (not shown) and a plurality of rotating rollers 910 . A transfer unit (not shown) may transfer the GRP pipe 2, and when the GRP pipe 2 is transferred, the GRP pipe 2 may be rotated by a plurality of rotating rollers 910. The grinding unit 820 may grind the rotating GRP pipe 2 according to a predetermined length interval and mark a cutting area. The cutting unit 830 may cut the cutting area of the rotating GRP pipe 2 .

10 is a diagram for explaining a grinding unit according to an exemplary embodiment.

Referring to FIG. 10 , (a) is a side view of the grinding unit 820 . As in (a), the grinding member 821 of the grinding unit 820 may be configured in a cylindrical shape. Also, the grinding member 821 may include a plurality of grinders 822 .

(b) is a plan view of the cylindrical grinder member 821. The plurality of grinders 822 of the grinding member 821 may be divided into a first grinding part 823 , a cutting part 824 and a second grinding part 825 . In the first grinding part 823, the plurality of grinders 822 are arranged in a first oblique shape with a high right side and a low left side, and in the second grinding part 825, a plurality of grinders 822 have a high left side and a low right side. It may be arranged in a second oblique shape. That is, the plurality of grinders 822 in the first grinding part 823 and the second grinding part 825 may be symmetrically disposed with respect to the cutting part 824 . In addition, the plurality of grinders 822 in the cutting portion 824 may be disposed horizontally without being inclined. In addition, the plurality of grinders 822 may protrude from the cutting portion 824 relative to the first grinding portion 823 and the second grinding portion 825 . In addition, the center of the plurality of grinders 822 in the cutting portion 824 may include a protruding surface 826 having the highest height. Accordingly, the plurality of grinders 822 in the first grinding part 823 may have a lower height from left to right. In addition, the plurality of grinders 822 in the second grinding part 825 may have a lower height from right to left.

11 is a diagram for explaining grinding of a GRP pipe of a grinding unit according to an embodiment.

Referring to FIG. 11, the GRP pipe 2 may move from left to right at a predetermined speed by the above-described transfer unit. The control unit 700 calculates the transport length according to the transport speed of the GRP pipe, and when the transport length reaches a predetermined length, the grinding unit 820 and the aforementioned cutting unit 830 come into contact with the GRP pipe to perform grinding and cutting. can Specifically, by the cutting portion 830, the GRP pipe 2 may be divided into a second GRP pipe 2B and a first GRP pipe 2A. At this time, the first grinding part 823 of the grinding part 820 grinds the outer surface of the first end region 831 of the second GRP pipe 2B, and the second grinding part 825 grinds the first GRP pipe 2B. The outer surface of the second end region 832 of (2A) is ground, and the cut portion 824 may mark a cut region between the second GRP pipe 2B and the first GRP pipe 2A.

When the grinding and cutting of the GRP pipe 2 is performed, when the GRP pipe is not moved by the transfer unit, the length of the first end region 831 corresponds to the width of the first grinding portion 823, and the second The length of the end region 832 may correspond to the width of the second grinding part 825 . also. When the GRP pipe is moved by the conveying unit, the length of the first end region 831 is longer than the width of the first grinding part 823 by the moving length according to the moving speed of the GRP pipe, and the second end region 832 The length of may be longer than the width of the second grinding part 825 by the moving length according to the moving speed of the GRP pipe.

In the first grinding part 823, a plurality of grinders 822 are disposed in the first oblique direction, and as the height decreases toward the right, in the first end region 831 of the second GRP pipe 2B, The depth of grinding performed by the plurality of grinders 822 is the deepest outside the first end region 831 , and may decrease from the outside to the inside of the first end region 831 . Accordingly, a portion of the outer layer may be exposed on the outside of the first end region 831, and only the outer finishing layer may be exposed without the outer layer being exposed on the inside. Accordingly, the second GRP pipe 2B is inserted into the connector 1100 from the outside of the first end region 831 as shown in FIG. 9, and the height of the outside of the first end region 831 is the first end region. As it is lower than the inner side of 831, the second GRP pipe 2B can be easily inserted into the connector 1100.

In addition, as the plurality of grinders 822 protrude from the cutting portion 824 and include the protruding surface 826, the grinding depth performed by the plurality of grinders 822 at the cutting area 833 is first It may be deeper than the end region 831 and the second end region 832 . This may be to divide the second GRP pipe 2B and the first GRP pipe 2A by the cutting region 833 and facilitate cutting of the cutting region 833 by the cutting portion 830 .

In addition, in the second grinding part 825, a plurality of grinders 822 are disposed in the second oblique direction, and as the height decreases toward the left, the second end region 832 of the first GRP pipe 2A In , the grinding depth by the plurality of grinders 822 is the deepest outside the second end region 832 , and the grinding depth may decrease from the outside to the inside of the second end region 832 . Accordingly, a part of the outer layer may be exposed from the outside of the second end region 832, and only the outer finishing layer may be exposed without the outer layer being exposed from the inside. Accordingly, the first GRP pipe 2A is inserted into the connector 1100 from the outside of the second end region 832, as shown in FIG. 9, and the height of the outside of the second end region 832 is the second end region. As it is lower than the inner side of 832, the first GRP pipe 2A can be easily inserted into the connector 1100.

When the grinding and cutting are completed, the control unit 700 may separate the grinding unit 820 and the cutting unit 830 from the GRP pipe 2 .

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (13)

In the GRP pipe manufacturing apparatus,
A controller for controlling the GRP pipe manufacturing apparatus;
mandrel;
a liner layer forming unit for forming a liner layer by providing a circumferential liner layer reinforcing material, a multidirectional liner layer reinforcing material, and a first resin on the base moving along the surface of the mandrel;
a first heating unit disposed inside the mandrel and thermally connected to the mandrel to provide heat for curing the liner layer to the liner layer through the mandrel;
Forming an inner layer by providing an inner circumferential reinforcement, an inner multidirectional reinforcement, and a second resin on the liner layer;
Forming a core layer by providing a core layer circumferential reinforcement, a core layer multidirectional reinforcement, sand, and the second resin on the inner layer;
a structural layer forming unit for forming an outer layer by providing an outer circumferential reinforcing material, an outer multidirectional reinforcing material, and the second resin on the core layer; and
A second heating unit disposed outside the liner layer, the inner layer, the core layer, and the outer layer, and providing heat for curing the liner layer, the inner layer, the core layer, and the outer layer.
including,
The liner layer forming unit includes a liner layer resin tank accommodating the first resin,
The structure layer forming unit includes a structure layer resin tank accommodating the second resin,
The control unit,
Control the temperature of the heat provided from the first heating unit and the second heating unit and the internal temperature of the liner layer resin tank and the structural layer resin tank,
The structural layer forming unit,
Including a sand accommodating portion for accommodating the sand,
The control unit,
Control the internal temperature of the liner layer resin tank and the structure layer resin tank to 20 degrees to 25 degrees,
The internal temperature of the sand receiving part is controlled to 25 degrees to 35 degrees,
Control the temperature of the heat provided from the first heating unit to 35 degrees to 45 degrees,
Controlling the temperature of the heat provided from the second heating unit to 110 degrees to 150 degrees,
GRP pipe manufacturing equipment.
delete delete delete delete delete delete According to claim 1,
The tex number of the liner layer circumferential reinforcement is controlled to be smaller than the tex numbers of the inner circumferential reinforcement, the core layer circumferential reinforcement, and the outer circumferential reinforcement,
GRP pipe manufacturing equipment.
According to claim 8,
The tex number of the liner layer circumferential reinforcement is 1200,
The number of tex of the inner circumferential reinforcement, the core layer circumferential reinforcement, and the outer circumferential reinforcement are controlled to 2400 and 4400,
GRP pipe manufacturing equipment.
According to claim 1,
The liner layer providing unit,
The liner layer circumferential reinforcement, the liner layer multidirectional reinforcement, and the first resin are provided on the base in the order of the liner layer circumferential reinforcement, the first resin, and the liner layer multidirectional reinforcement, in order to form the liner layer. form,
The structural layer forming unit,
Forming the inner layer by providing the inner circumferential reinforcement, the inner multidirectional reinforcement, and the second resin on the liner layer in the order of the inner circumferential reinforcement, the second resin, and the inner multidirectional reinforcement,
The core layer circumferential reinforcement, the core layer multidirectional reinforcement, and the second resin are provided on the inner layer in the order of the core layer circumferential reinforcement, the second resin, the sand, and the core layer multidirectional reinforcement, forming a core layer;
Forming the outer layer by providing the outer circumferential reinforcement, the outer multidirectional reinforcement, and the second resin on the core layer in the order of the outer layer circumferential reinforcement, the second resin, and the outer multidirectional reinforcement,
GRP pipe manufacturing equipment.
According to claim 1,
The weight ratio of the liner layer multidirectional stiffener, the inner layer multidirectional stiffener, the core layer multidirectional stiffener, and the outer layer multidirectional stiffener and the circumferential stiffener included in each layer is controlled at 15% to 20%,
GRP pipe manufacturing equipment.
A GRP pipe manufacturing method using the GRP pipe manufacturing apparatus of any one of claims 1 and 8 to 11.
As it is produced by the GRP pipe manufacturing apparatus of any one of claims 1 and 8 to 11, the possibility of bubbles and cracks is lowered, and the circumferential reinforcement of the liner layer and the multidirectional reinforcement of the liner layer Impregnation performance of the first resin and the inner circumferential reinforcement, the inner multidirectional reinforcement, the core layer circumferential reinforcement, the core layer multidirectional reinforcement, the sand, the outer circumferential reinforcement, and the outer multidirectional reinforcement A GRP pipe having improved impregnation performance into the second resin.

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