KR20180111034A - Method for manufacturing pipe cover using multilayer-prepreg having fire resistance and flame retardancy - Google Patents

Abstract

The present invention relates to a method for manufacturing a pipe cover using multilayer-prepreg having fire resistance and flame retardancy, in which a fire resistant material mixed in a resin is directly and uniformly applied to a fiber to continuously laminate the fire resistant material in multiple layers to be suitable for desired thickness, multilayer-prepreg having fire resistance and flame retardancy is manufactured so that a sheet form or a roll form with a desired size can be selectively provided, and the multilayer-prepreg is manufactured to be easily applied as the pipe cover. Therefore, the uniformity of quality is ensured, the productivity can be improved and the production cost can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flame-retardant multilayer prepreg,

TECHNICAL FIELD The present invention relates to a piping cover used for piping in shipbuilding, offshore plants, industrial power generation facilities, and the like, and a method of manufacturing a piping cover using a multilayer prepreg having flame resistance.

Generally, fiber reinforced composites (FRP) with high strength-weight ratio are widely applied not only to small structures for sports leisure such as fishing rods and golf clubs, but also to large structures such as blades for wind turbines, telephone poles, and airframes .

As a method of forming such a fiber-reinforced composite material, there are a sheet molding compound method, an RTM (resin transfer molding) method, a filament winding method, a pultrusion method, a hot press method and an autoclave method Among them, molded products requiring excellent properties, such as airplanes, large blades for wind turbine generators, high-voltage transmission tower telegraph poles, and electric / electronic machine parts, are mostly molded using a prepreg using an autoclave method .

Pre-preg is an abbreviation of pre-impregnated material which means pre-impregnated raw material. It is a sheet-type intermediate material for composite material molding impregnated with reinforcing fiber at a certain ratio. It is a material that has the advantage of being able to form composite materials that can be adjusted, have good fiber orientation, and have various resin properties.

Such prepregs have various properties depending on the kind of the fiber material as well as the kinds of additives and additives added to the resin and the resin depending on the products to be produced. In this respect, recently, fire resistant flame retardant products which do not burn well to prevent fire have been recently demanded. In particular, fire resistant flame retardants are also required for pipe covers for shipbuilding and offshore plants, cover panels for general construction and civil engineering, A product having flame retardancy is required.

In order to produce a prepreg for a fireproof flame retardant cover panel, a resin impregnation method for impregnating a resin mixed with a refractory material into a resin through a drying furnace to produce a prepreg of a single layer, as in a general prepreg manufacturing method, There is a film application pressing method in which the mixed resin is first applied to a film, and then the fibers are compressed.

However, when the above general prepreg manufacturing method is used for manufacturing prepregs for fire-resistant flame retardant cover panels, since the refractory material mixed in the resin can not be uniformly impregnated into the fibers, it is difficult to ensure quality, There is a problem that the process is complicated and the productivity is lowered and the production cost is increased.

In order to solve the above problems, it is an object of the present invention to provide a refractory material which is mixed with a resin uniformly and directly laminated on a fiber in a multilayered manner in a desired thickness, Flame retardant multi-layer prepreg using a flame-retardant multilayer prepreg, which can be easily applied to a pipe cover by using a multilayer prepreg having a fire-retardant property through a series of processes I have to.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to accomplish the above object, a method for manufacturing a pipe cover using a fire retardant multilayer prepreg according to the present invention comprises the steps of: preparing a prepreg made of a fire retardant multilayer prepreg containing a UV curable resin; And a cover manufacturing step of fabricating a cover for a pipe by wrapping the outer circumferential surface of the pipe to be protected in a round shape and UV-curing in advance, wherein the prepreg manufacturing step comprises the steps of: A first resin applying step of applying a resin mixed with a refractory material to an upper portion of the lower release film, a second resin applying step of applying a resin mixed with a refractory material to the upper portion of the lower release film, The first woven fiber sheet is unwound from the first woven fiber roll, and the lower release film A second resin applying step of applying a resin mixed with a refractory material to an upper portion of the first woven fiber sheet; and a second resin applying step of applying a resin mixed with the refractory material A roving fiber laminating step of applying a roving fiber layer to the upper portion of the first woven fiber sheet to form a plurality of roving fiber layers while applying a resin mixed with the refractory material to each of the roving fiber layers; A second weaving fiber supplying step of loosening the second weaving fiber sheet from the second weaving fiber roll and supplying the second weaving fiber sheet along the transport direction so as to be laminated on the uppermost portion of the multilayered laminated roving fiber layer; A third resin applying step of applying a mixed resin; and a third resin applying step of releasing the upper release film from the upper release film roll on which the upper release film is wound, A second release film feed step of feeding the first release film and the second release film along the transport direction so as to be attached to the upper portion of the second woven fiber sheet coated with the first release film, A roller pressing step of pressing the plurality of roving fiber layers and the second woven fiber sheet through a plurality of pressing rollers so as to be impregnated into each of the plurality of roving fiber layers and the second woven fiber sheet, And drying the prepreg.

Each of the first woven fiber sheet, the roving fiber and the second woven fiber sheet may be any one of glass fiber, carbon fiber, or basalt fiber, or a combination thereof. .

The resin mixed with the refractory material is characterized in that any one of magnesite, dolomite, glass fiber, carbon fiber, or bazaart fiber, or a combination thereof is finely crushed or milled and mixed with a resin.

The method may further include cutting both sides of the prepreg, which have been dried through the drying chamber, along a conveying direction with a pair of rotary cutters.

The method may further include a winding roll storing step of winding the prepreg cut at both ends thereof around a winding roller and storing the prepreg in a roll form.

The method may further include a step of storing the sheet into a plate-like prepreg sheet by cutting the prepreg cut at both ends to a predetermined length in the longitudinal direction.

The cover manufacturing step may include: a prepreg lapping step of wrapping the outer peripheral surface of the production roller having a size corresponding to the pipe with the prepreg so that both ends in the radial direction are not connected to each other; A UV curing step in which the prepreg is UV-cured in accordance with the rotation of the production roller; and a UV-curing step of UV-curing the prepreg, And a take-out step of taking out the sheet from the production roller.

The prepreg lapping step may be wrapped around the outer circumferential surface of the production roller so that both ends of the prepreg in the radial direction are overlapped with each other.

The process for producing a pipe cover using a refractory fire-resistant multilayer prepreg according to the present invention is characterized in that a refractory material mixed with a resin is directly and uniformly applied to a fiber and is continuously laminated in multiple layers in accordance with a required thickness, Layered prepreg with refractory flame retardancy is manufactured through a series of processes to selectively provide a roll shape, and it is manufactured so that it can be easily applied to a pipe cover using the multilayer prepreg, thereby ensuring uniformity of quality and improving productivity And the production unit cost can be reduced.

1 is a flow chart showing an embodiment of a method for manufacturing a pipe cover using a fire retardant multilayer prepreg according to the present invention,
Fig. 2 is a schematic view showing a prepreg making step in the embodiment of Fig. 1,
FIG. 3 is a configuration diagram of a recessed portion showing a step of supplying a lower release film and a step of applying a first resin during a prepreg fabrication step in the embodiment of FIG. 2,
FIG. 4 is a cross-sectional view showing a state where the first weaving fiber supplying step, the second resin applying step, the roving fiber supplying step, the second weaving fiber supplying step, the third resin applying step and the upper release film supplying step And Fig.
Fig. 5 is a configuration diagram of the recessed portion showing the roller pressing step during the prepreg manufacturing step in the embodiment of Fig. 2,
Fig. 6 is a configuration view of the main part showing the prepreg drying step in the prepreg manufacturing step in the embodiment of Fig. 2,
Fig. 7 is a flowchart showing another embodiment of the prepreg fabrication step in the embodiment of Fig. 1,
FIG. 8 is a perspective view showing the both-end cutting step and the winding roll storing step in the embodiment of FIG. 7,
Fig. 9 is a flowchart showing still another embodiment of the prepreg fabrication step in the embodiment of Fig. 1,
FIG. 10 is a perspective view showing the both-end cutting step and the sheet-holding step in the embodiment of FIG. 9,
11 is a flowchart showing a specific embodiment of the cover making step in the embodiment of FIG. 1,
FIGS. 12 to 14 are perspective views showing the process of each step of the embodiment of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for manufacturing a pipe cover using a fire retardant multilayer prepreg according to the present invention will be described in detail with reference to the accompanying drawings.

The method for manufacturing a pipe cover using a flame retardant multilayer prepreg according to the present invention includes a prepreg making step (S100) and a cover making step (S200) as shown in FIGS. 1 to 14, The step S100 may include a lower release film supplying step S101, a first resin applying step S102, a first weaving fiber supplying step S103, a second resin applying step S104, a roving fiber laminating step S105, The second weave fiber supplying step S106, the third resin applying step S107, the upper release film supplying step S108, the roller pressing step S109, and the prepreg drying step S110. 7 to 10, the prepreg making step S100 may further include a winding roll storing step S112 or a sheet holding step S113 together with a both-end cutting step S111 . 11 to 14, the cover manufacturing step S200 includes a prepreg lapping step S201, a UV light irradiation step S202, a UV curing step S203, and a cover taking step S204 can do.

First, in the prepreg making step (S100), a refractory fire-resistant multilayer prepreg 10 containing a UV-curable resin is prepared as shown in Figs. The refractory flame-retardant multilayer prepreg 10 is produced in such a manner that UV curable resin is contained in each of the resins to be applied in the process of manufacturing the prepreg 10, as described later. Accordingly, the prepreg 10 can be cured by irradiating UV light in the cover making step S200.

As shown in FIGS. 2 and 3, the lower release film feed step (S101) is a process of manufacturing the prepreg from the lower release film roll 200 wound with the lower release film 210 The lower release film 210 is released and fed onto the transfer table 100 along the transfer direction. The lower release film 210 is referred to as a peelply, and can be easily removed after curing the resin by suppressing impregnation of the resin by treatment such as coating on the nylon fiber. The lower release film 210 is wound in the form of a roll and is unwound from the lower release film roll 200 while being fed along the conveying direction onto the conveyance table 100. The lower release film 210 is fed from the prepreg And functions as a lower cover surface.

In the first resin application step (S102), the resin 10 mixed with the refractory material is applied to the upper part of the lower release film 210 as shown in FIGS. The resin 10 mixed with the refractory material may be finely crushed or crushed into a resin, and the refractory material may be any one of magneite, dolomite, glass fiber, carbon fiber, or Vasartite fiber, or a combination thereof. Refractories are materials that are not cracked or deformed at high temperatures, and they are acidic, basic or neutral depending on how they are made. The glass fiber or the basalt fiber is acidic, the magnesite or dolomite is basic, and the carbon fiber is neutral. These refractory materials are finely crushed or kneaded and put into a resin, followed by stirring to form a mixture, and the resulting mixture becomes a resin 10 mixed with the refractory material.

The first weaving fiber supply step (S103) may be performed by loosening the first woven fiber sheet 310 from the first woven fiber roll 300 on which the first woven fiber sheet 310 is wound as shown in Figs. 2 and 4 The refractory material is supplied along the transport direction so that the mixed resin 10 is laminated on the upper part of the coated lower release film 210. The first woven fiber sheet 310 forms the lowest layer of a prepreg that is finally fabricated, and is formed by weaving fibers into sheets. That is, it is a fiber sheet made by weaving two groups of yarns at right angles to each other using a loom. The first woven fiber sheet 310 may be made of any one of glass fiber, carbon fiber and basalt fiber so as to have flame retardant resistance together with the resin 10 mixed with the refractory material. One or a combination thereof may be used. That is, glass fiber, carbon fiber, and basalt fiber all have a flame retardant resistance to heat up to at least 1000 ° C.

The second resin applying step (S104) applies the resin mixed with the refractory material to the upper portion of the first woven fiber sheet 310 as shown in Figs. The resin 10 mixed with the refractory material in the second resin applying step S104 is applied every time the respective layers are stacked in the first resin applying step S102 and the third resin applying step S107 described later So that a large amount of refractory material is impregnated with the resin between the fibrous layers.

As shown in FIGS. 2 and 4, the roving fiber laminating step S105 is a step of supplying the roving fibers 400 to the upper portion of the first woven fiber sheet 310 coated with the resin 10 mixed with the refractory material, The resin 10 mixed with the refractory material is applied between the roving fiber layers 410, respectively. Although the roving fiber layer 410 shows two layers, the roving fiber layer 410 may be formed of three or more layers depending on the thickness of the prepreg to be manufactured. At this time, a plurality of roving fibers 400 are unwound from the fiber rolls and are arranged in parallel in one direction to form a roving fiber layer 410, which is laminated on top of the first woven fiber sheet 310, A resin 10 mixed with a refractory material is applied. As compared with the first woven fiber sheet 310, the roving fiber layer 410 is a unidirectional fiber layer, and since there is much space between the fibers and the fiber, a greater amount of the refractory material can be inserted. Like the first woven fiber sheet 310, the roving fiber may be any one of glass fiber, carbon fiber, and bar-cut fiber.

The second weaving fiber supply step (S106) loosens the second woven fiber sheet 510 from the second woven fiber roll 500 in which the second woven fiber sheet 510 is wound as shown in Figures 2 and 4 And is supplied along the transport direction so as to be stacked on the uppermost portion of the roving fiber layer (410) stacked in layers. The second weft fiber sheet 510 has the same structure and function as the first weft fiber sheet 310, but forms the uppermost layer of the prepreg that is finally fabricated, and is formed by weaving the fibers into sheets.

In the third resin applying step S107, the resin 10 mixed with the refractory material is applied to the upper portion of the second woven fiber sheet 510 as shown in Figs. The resin 10 mixed with the refractory material in the third resin applying step S107 is also applied each time the respective layers are laminated in the first resin applying step S102 and the second resin applying step S104 , So that a large amount of refractory material is impregnated with the resin between the fiber layers.

As shown in FIGS. 2 and 4, the upper release film is supplied from the upper release film roll 600 on which the upper release film 610 is wound, to remove the upper release film 610, Along the conveying direction, so that the first woven fabric sheet 10 is attached to the upper portion of the second woven fiber sheet 510 to which the second woven fiber sheet 510 is applied. The upper release film 610 has the same structure and function as the lower release film 210 described above and can be easily removed after resin curing by suppressing impregnation of the resin, Function.

The roller pressing step S109 is a step in which the resin 10 mixed with the refractory material applied between the lower release film 210 and the upper release film 610 is pressed against the first woven fiber sheet 310 The plurality of roving fiber layers 410 and the second woven fiber sheets 510 are pressed through the plurality of pressing rollers 710 so as to be impregnated. The compression by the compression roller 710 is to remove the air inside while impregnating the resin 10 mixed with the refractory material and to make the thickness of the prepreg to be manufactured constant. Although a plurality of pressing rollers 710 are shown in the drawing, three or more pressing rollers 710 may be provided as the number of the fiber layers increases. In addition, the thickness of the pressing roller 710 must be reduced by sequentially pressing the pressing roller 710 to reduce the pressing resistance, thereby ensuring uniformity in quality.

As shown in FIGS. 2 and 6, in the prepreg drying step (S110), the prepregs 10 having a predetermined thickness are dried through the drying chamber 720 through the plurality of pressing rollers 710. The drying chamber 720 appropriately dries the resin impregnated in the multilayer prepreg 10 under a high temperature atmosphere. The drying temperature and time may be varied depending on the number of the fiber layers constituting the prepreg 10, depending on the number of the fiber layers. At this time, a multi-stage hot roller may be disposed as shown in FIG. 6 so that heat can be directly transferred to the prepreg 10 in order to reduce drying time.

As described above, the prepreg 10 is manufactured through the prepreg drying step (S110). It is possible that air is discharged to both side ends or the resin is pushed, and both side ends of the prepreg 10 are cut It is necessary to keep it clean. To this end, it is possible to further include an end cutting step S111 as shown in FIGS. That is, in the both-end cutting step (S110), both side ends of the prepreg (10) dried through the drying chamber (720) are cut along the feeding direction by the pair of rotary cutters (730).

7 and 8, the prepreg 10 may be wound around a winding roller 740 and stored in the form of a roll. In FIGS. 9 and 10, It may be cut and stored in a plate-like prepreg sheet. That is, in the winding roll storage step (S112), the prepregs 10 having both ends cut off are wound around a take-up roller 740 and stored in the form of rolls. In the step S113, The legs 10 are cut to a predetermined length in the front and rear directions, and are stored in a plate-like prepreg sheet.

The cover fabricating step S200 for fabricating the pipe cover 20 is performed by using the refractory flame retardant multilayer prepreg 10 fabricated by the prepreg fabrication step S100 as described above. 1 and 11 to 14, the prepreg 10 is wrapped round the circumference of the pipe to be protected, and is UV-cured to manufacture the pipe cover 20 do.

More specifically, the cover making step S200 includes a prepreg lapping step S201, a UV light irradiation step S202, a UV curing step S203, and a cover taking step S204 as shown in FIG. 11 do.

As shown in FIGS. 12 and 13, the prepreg lapping step (S201) is a step of forming the prepreg 10 so that both ends of the radial direction are not connected to the outer circumferential surface of the production roller 800 having a size corresponding to the pipe Wrap. 10, when the prepreg 10 is in the form of a sheet-like sheet, the prepreg sheet 10 has to be made sufficiently large so as to cover the outer circumferential surface of the production roller 800, As shown in the figure, when the roll is wound in the form of a roll, the prepreg 10 is unwound from the wound roll 740 wound around the production roller 800 and cut to a desired size.

At this time, the prepreg lapping step (S201) allows the prepreg 10 to be wrapped around the outer circumferential surface of the production roller 800 such that both ends of the prepreg 10 in the radial direction are overlapped with each other. This is for wrapping the entire circumference of the pipe, and both ends are wrapped around the pipe and fixed to each other through bonding or other bolts.

13, the UV light irradiation step S202 irradiates the prepreg 10 wrapped by the production roller 800 from the UV light irradiation part 900 provided below the production roller 800, Light is irradiated. As shown in the prepreg fabrication step (S100), since the UV curable resin is contained in the resin to be coated when preparing the prepreg (10), UV curing will occur when UV light is irradiated toward the prepreg (10).

That is, in the UV curing step (S203), as shown in FIG. 13, the prepreg 10 is UV-cured in accordance with the rotation of the producing roller 800. When the prepress 10 is wrapped around the outer circumferential surface of the production roller 800, if the production roller 800 is rotated with respect to the fixed UV light irradiating unit 900, the prepreg 10 also rotates, ) Penetrate the entire area of the prepreg 10. Accordingly, the prepreg 10 is UV-cured in the state of being wrapped around the outer circumferential surface of the production roller 800 and is made of the pipe cover 20.

In the cover take-out step S204, the prepreg 10 which is UV-cured is taken out from the production roller 800 as shown in Fig. The UV cured prepregs 10 are not connected to each other at both ends in the radial direction and therefore are opened when the both ends of the UV cured prepregs 10 are gripped by the production roller 800. When the pipe cover 20 The pipe cover 20 can be easily taken out from the production roller 800. As a result,

As described above, the method for manufacturing a pipe cover using the refractory flame retardant multilayer prepreg according to the present invention is characterized in that a refractory material mixed with a resin is directly and uniformly applied to a fiber, Layered prepreg 10 having a flame retardant property can be manufactured through a series of processes so as to selectively provide a sheet form or a roll form of the laminate prepreg 10, Quality uniformity can be ensured, productivity can be improved, and production cost can be reduced.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10: prepreg
20: Cover for piping
100: Feed table
200: Lower release film roll 210: Lower release film
300: first woven fiber roll 310: first woven fiber sheet
400: roving fiber 410: roving fiber layer
500: second weave fiber roll 510: second weave fiber sheet
600: Upper release film roll 610: Upper release film
710: Compression roller 720: Drying chamber
730: rotary cutter 740: winding roll
800: Production roller
900: UV light irradiation part
S100: Prepreg manufacturing step
S101: Lower Release Film Feeding Step
S102: First resin application step
S103: First weaving fiber supplying step
S104: the second resin application step
S105: roving fiber laminating step
S106: Second weaving fiber supplying step
S107: Third resin application step
S108: upper release film feeding step
S109: roller pressing step
S110: prepreg drying step
S111: Cutting step on both sides
S112: winding roll storage step
S113: Storing the sheet on a sheet
S200: Step of making cover
S201: prepreg wrapping step
S202: UV light irradiation step
S203: UV curing step
S204: Step of taking out the cover

Claims (8)

A prepreg manufacturing step of manufacturing a fire retardant multilayer prepreg containing a UV curable resin,
Forming a cover for a pipe by winding the prepreg in a round shape so as to surround an outer circumferential surface of a pipe to be protected,
The prepreg-
A lower release film feeding step of loosening the lower release film from the lower release film roll on which the lower release film is wound and feeding the release film on the transfer table along the conveying direction,
A first resin applying step of applying a resin mixed with a refractory material to an upper portion of the lower release film,
The first woven fiber sheet is unwound from the first woven fiber roll on which the first woven fiber sheet is wound, and the first woven fiber sheet is wound around the first woven fiber roll so that the first woven fiber sheet is stacked on the upper portion of the lower release film coated with the resin mixed with the refractory material. A supply step,
A second resin applying step of applying a resin mixed with a refractory material to an upper portion of the first woven fiber sheet;
A roving fiber laminating step of applying a resin mixed with a refractory material to each of the roving fiber layers while forming a plurality of roving fiber layers by supplying roving fibers to the upper portion of the first woven fiber sheet coated with the resin mixed with the refractory material;
A second weaving fiber feeding step of feeding the second weaving fiber sheet from the second weaving fiber roll wound with the second weaving fiber sheet rolled up so as to be laminated on the uppermost portion of the multilayered laminated roving fiber layer along the feeding direction,
A third resin applying step of applying a resin mixed with a refractory material to an upper portion of the second woven fiber sheet,
An upper release film feeding step of loosening the upper release film from the upper release film roll on which the upper release film is wound and supplying the upper release film along the conveying direction so as to be adhered to the upper portion of the second woven fiber sheet coated with the resin mixed with the refractory,
A roller pressing step of pressing a resin mixed with the refractory material applied between the lower release film and the upper release film through a plurality of compression rollers so as to be impregnated into the first woven fiber sheet, the plurality of roving fiber layers and the second woven fiber sheet, ,
And a prepreg drying step of drying a prepreg having a predetermined thickness through the plurality of compression rollers through a drying chamber.
The method according to claim 1,
The first woven fiber sheet, the roving fiber, and the second woven fiber sheet, respectively,
Flame retardant multilayer prepreg according to any one of claims 1 to 3, wherein the flame retardant multilayer prepreg is one of glass fiber, carbon fiber, and basalt fiber, or a combination thereof.
The method according to claim 1,
The refractory-
Flame retardant multilayer prepreg characterized in that any one or a combination of two or more of magnesite, dolomite, glass fiber, carbon fiber, or barazalt fiber is finely crushed or milled and mixed with a resin.
The method according to claim 1,
Further comprising cutting both sides of the prepreg, which have been dried through the drying chamber, along a feeding direction with a pair of rotary cutters. The method according to claim 1, Way.
5. The method of claim 4,
Further comprising a winding roll storing step of winding the prepreg cut at both ends thereof around a winding roller and storing the prepreg in a roll form.
5. The method of claim 4,
Further comprising a step of storing a sheet-like prepreg sheet by cutting the prepregs cut at both ends to a predetermined length before and after the sheet-like prepreg sheet, and storing the sheet-like prepreg sheet.
The method according to claim 1,
The cover-
A prepreg wrapping step of wrapping the prepreg in such a manner that both ends of the production roller having a size corresponding to the pipe are not connected to each other in the radial direction,
A UV light irradiation step in which UV light is irradiated from the UV light irradiation part provided below the production roller toward the prepreg wrapped by the production roller,
A UV curing step in which the prepreg is UV-cured in accordance with rotation of the production roller,
And removing the UV-cured prepreg from the production roller. 2. The method of claim 1,
8. The method of claim 7,
The prepreg wrapping step may include:
Flame retardant multilayer prepreg is wrapped around the outer circumferential surface of the production roller so that both ends of the prepreg in the radial direction are overlapped with each other.

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