JP2020176724A - Wiring integrated type resin pipe - Google Patents

Abstract

To provide a wiring integrated type resin pipe which has achieved both light weight and productivity.SOLUTION: A wiring integrated type resin pipe includes: a pipe-shaped sheet (7) which has substantially a pipe shape with an interval such that a slit (6) is formed between both ends in a shorter direction (X); a wiring unit (8) disposed in the pipe-shaped sheet (7) in a longer direction (Y) of the slit (6) further inside than the slit (6); and a resin material (9) filled in a gap constituted by a mating surface of the slit (6) of the pipe-shaped sheet (7) and the wiring unit (8), and sealing the mating surface of the slit (6) of the pipe-shaped sheet (7). The wiring unit (8) includes a conductor wire (10) for wiring, and a holder (11) in which the conductor wire (10) is inserted, and the conductor wire (10) is laid in the longer direction inside the wiring unit (8).SELECTED DRAWING: Figure 1

Description

The present invention relates to a wiring-integrated resin pipe in which a lead wire for electrical wiring is integrally laid.

The wiring-integrated resin pipe is generally formed by, for example, injection molding or extrusion molding to obtain a target diameter and length. In the method of coating a lead wire for electrical wiring, for example, by inserting the lead wire into a cross head portion at the tip of an extrusion molding machine, a coating resin is formed while covering the periphery of the lead wire together with extrusion molding.

When these conventional techniques are combined to form a resin pipe with integrated wiring by extrusion molding, it is easy to manufacture a resin pipe in which the lead wire is arranged in the pipe by inserting the lead wire into the cross head at the tip. I can imagine.

However, in the wiring-integrated resin pipe manufactured by the method described above, when the resin pipe is cut to an arbitrary length, the wiring inside the resin pipe is also cut, so that the end face of the resin pipe is also cut. Since the end faces of the wiring and the wiring are lined up on the same surface, there is a problem that it is extremely difficult to conduct with the outside and add / connect terminals.

The method shown in Patent Document 1 has been developed to solve the above problems. 23 and 24 show the method of integrating the pipe and the wiring described in Patent Document 1.

FIG. 23 shows an inner cylinder member 41 for a nominal diameter (inner diameter of a pipe) of 200 mm before grooving, which is substantially cylindrical, has an inner diameter D of about 218 mm, and a wall thickness t of 5 mm. There are pedestals 42a and 42b on the outer surfaces of both ends to which the connector pins are mounted, and these are made of a thermoplastic resin such as polyethylene.

The spiral groove 43 shown in FIG. 24 is machined in the inner cylinder member 41. Then, a heating wire is wound in the groove 43, a connector pin is connected, and this is attached to the pedestals 42a and 42b. Separately, the outer cylinder member is integrally molded by injection molding to complete an electrowelding type plastic pipe joint.

Japanese Unexamined Patent Publication No. 6-341587

However, in the conventional configuration, it is necessary to perform groove processing on the entire circumference of the pipe according to the distance between the connector pins that require wiring, and then wind the lead wire along the groove. Further, it is necessary to form an outer cylinder capable of covering the wiring according to the distance required after winding the wiring around the inner cylinder in which the groove is machined. Therefore, there is a problem that the final pipe thickness becomes large and the weight becomes heavy, and there is a problem that the manufacturing time until the completion of the pipe becomes long and the productivity becomes extremely low.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a wiring-integrated resin pipe that is lightweight and has both productivity.

The wiring-integrated resin pipe of the present invention has a pipe-shaped sheet having a substantially pipe shape at intervals so that slits are formed between both ends in the lateral direction, and the length of the slit inside the slit. The wiring unit arranged in the tube-shaped sheet along the direction, and the gap formed by the mating surface of the slit of the tube-shaped sheet and the wiring unit are filled to fit the slits of the tube-shaped sheet. It has a resin material whose surface is hermetically sealed, and is characterized in that a wiring lead wire is laid inside the wiring unit in the longitudinal direction.

Further, in the method for manufacturing a wiring-integrated resin pipe of the present invention, a thermoplastic sheet having a rectangular shape is arranged in a substantially pipe shape at intervals so that slits are formed between both ends in the lateral direction, and wiring is performed. A wiring unit in which a lead wire for use is laid in the longitudinal direction is arranged on the thermoplastic sheet along the longitudinal direction of the slit inside the slit, and the mating surface of the slit of the thermoplastic sheet and the wiring unit. It is characterized in that the gap formed by the above is filled with a resin material to integrate the thermoplastic sheet and the wiring unit.

The wiring-integrated resin pipe having this configuration does not increase in thickness due to the outer peripheral coating in terms of the thickness and weight of the pipe, so that it can be molded with the target sheet thickness from the beginning, and a significantly lightweight pipe can be obtained. it can.

In addition, it is not necessary to wind the wire over the entire circumference required for wiring, and the wire covering process after winding is not required, so that the running time until the product is completed can be reduced.

According to this configuration, a lightweight resin pipe using a thermoplastic multilayer fiber reinforced sheet and integrated wiring can be supplied at low cost with high productivity and yield.

Perspective view of the end of the wiring-integrated resin pipe according to the first embodiment of the present invention. (A) Longitudinal sectional view and (b) AA sectional view of the wiring-integrated resin pipe of the same embodiment. (A) Longitudinal sectional view of the holder and (b) sectional view thereof BB according to the same embodiment. External view of vacuum cleaner Perspective view of the wiring-integrated resin pipe of the same embodiment Explanatory drawing of the mold open state of the injection molding apparatus used for molding the wiring-integrated resin pipe of the same embodiment. Explanatory drawing of the mold closed state of the injection molding apparatus used for molding the wiring-integrated resin pipe of the same embodiment. (A) Cross-sectional view immediately before setting the wiring unit on the core rod of the injection molding apparatus and side view of the core rod, and (b) Cross-sectional view of the state where the wiring unit is set on the core rod and its CC cross-sectional view. An enlarged view showing a gap 26 for joining the slide cores 23a and 23b. Explanatory drawing of a state where the mold is closed and the resin material 9 is injected and filled. A mold configuration diagram showing a wiring relief space 28 that covers a portion of the wiring unit 8 from which the lead wire 10 is pulled out during molding. Explanatory drawing of mold opening state after solidification of resin material 9 Explanatory drawing of the state where the core rod 24 is pulled out from a molded product An exploded view of (a) a wiring unit used for the wiring-integrated resin pipe according to the second embodiment of the present invention and (b) a DD sectional view of a holder. Cross-sectional view of the main part of the core rod of the injection molding apparatus used in the same embodiment. Cross-sectional view before the wiring unit 8 is set in the recess 25 of the core rod in the same embodiment, the resin material 9 is injected and injected, and the core rod 24 is pulled out from the molded product. An explanatory diagram of (a) contraction stress acting from both ends in the axial direction toward the center of the pipe and (b) an overall view thereof when the first embodiment is used as a comparative example. An explanatory view of (a) the contraction stress acting from both ends in the axial direction toward the center of the pipe and the restoring force acting from the holder according to the second embodiment of the present invention, and (b) the overall view thereof. Cross-sectional view of another embodiment of the holder and the core rod used in the same embodiment. (A) (b) (c) of Embodiment 3 of this invention is a plan view which shows the holder of another Example. Cross-sectional view showing different holders (a) and (b) of Embodiment 4 of the present invention. (A) Cross-sectional view of the wiring unit and (b) E-E arrow view according to the fifth embodiment of the present invention. The figure which shows the inner cylinder member of the wiring-integrated resin pipe described in Patent Document 1. The figure which shows the groove shape provided in the inner cylinder member of the wiring-integrated resin pipe described in Patent Document 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 13 show the first embodiment of the present invention.

In the general vacuum cleaner shown in FIG. 4, a motor for generating dust and a force for sucking dust is arranged in the vacuum cleaner main body 1. The vacuum cleaner main body 1 and the suction nozzle 2 are connected via a flexible hollow hose 3 and a wiring-integrated resin pipe 4. A hand operation unit 5 provided at the tip of the hose 3 is provided with a power supply, a switch for performing various operations, and a display unit. For example, the motor of the suction nozzle 2 can be energized to rotate the brush via the wiring-integrated resin pipe 4.

FIG. 5 shows a wiring-integrated resin pipe 4. FIG. 1 is an enlarged view of one end of the wiring-integrated resin pipe 4. As shown in FIGS. 2A and 2B, the wiring-integrated resin pipe 4 has a substantially pipe shape at intervals so that slits 6 are formed between both ends in the lateral direction (arrow X direction). The pipe-shaped sheet 7 is composed of a pipe-shaped sheet 7, a wiring unit 8 arranged inside the slit 6 along the longitudinal direction (arrow Y direction), a mating surface of the slit 6 of the pipe-shaped sheet 7, and a wiring unit 8. It has a resin material 9 which is filled in the gap to be filled and seals the mating surface of the slit 6 of the pipe-shaped sheet 7, and a wiring lead wire 10 is laid in the wiring unit 8 in the longitudinal direction.

The tube-shaped sheet 7 is a polyolefin-based thermoplastic multilayer fiber-reinforced resin sheet having a woven fabric layer, and has a rectangular shape before molding. In the wiring unit 8, the holder 11 shown in FIGS. 3A and 3B and the groove 12 formed in parallel with each other in the holder 11 are formed in the longitudinal direction. The lead wire 10 is inserted into the groove 12. A polyolefin-based thermoplastic resin was used as the material of the holder 11. Both ends of the lead wire 10 are bent by 90 ° and pulled out to the outside of the holder 11. The length of the holder 11 in the longitudinal direction is longer than that of the tube-shaped sheet 7.

The resin material 9 melted by the injection molding device is injected and filled in the gap between the slit 6 formed so that the long sides of the tube-shaped sheet 7 face each other in the lateral direction and the holder 11 of the wiring unit 8. The tube-shaped sheet 7 and the wiring unit 8 are integrated by lowering the temperature of the resin material 9 and solidifying the resin material 9.

At both ends of the wiring-integrated resin pipe 4, connecting portions 13 having a predetermined shape are integrally formed of the resin material 9 at both ends of the pipe-shaped sheet 7 in the longitudinal direction. A part of the end portion of the holder 11 is exposed by the window 14 formed in the connecting portion 13, and the end portion of the lead wire 10 is pulled out from the window 14 of the connecting portion 13.

Further, when the resin material 9 melted by the injection molding apparatus is filled, the resin material 9 is also filled in the gaps between the grooves 12 of the holder 11 and solidified.

FIG. 6 shows the mold open state of the injection molding apparatus, and FIG. 7 shows the mold closed state. This injection molding apparatus is composed of a first mold 21 on the movable side and a second mold 22 on the fixed side. The second mold 22 is composed of slide cores 23a and 23b and a core rod 24 and the like set in the slide cores 23a and 23b. As shown in FIG. 8A, the core rod 24 is formed with a recess 25 for setting the holder 11 in a part of the upper surface.

The wiring-integrated resin pipe 4 can be manufactured in the following process.

First, the wiring unit 8 in which the lead wire 10 is set in the groove 12 is set in the recess 25 of the core rod 24 as shown in FIG. 8 (b). Further, as shown in FIG. 6, the tube-shaped sheet 7 is set on the peripheral surface of the core rod 24 so as to have a substantially tube shape.

Although the tube-shaped sheet 7 is wound after setting the wiring unit 8 on the core rod 24, the same applies to the case where the wiring unit 8 is set after winding the tube-shaped sheet 7 around the peripheral surface of the core rod 24.

Next, the slide cores 23a and 23b are closed, and the outer peripheral surface of the tube-shaped sheet 7 is restrained by the slide cores 23a and 23b. As shown in FIG. 9, a joining gap 26 is formed in the upper portion of the closed slide cores 23a and 23b along a slit 6 formed with the long sides facing each other in the lateral direction of the tube-shaped sheet 7. .. The joining gap 26 of the slide cores 23a and 23b is covered with the first mold 21.

As a result, the joining gap 26 is formed in an axially long shape by the slit mating surface of the tube-shaped sheet 7, the wiring unit 8, and the three surfaces of the slide cores 23a and 23b.

As shown in FIG. 10, the molten resin material 9 is injected and filled into the joining gap 26 from the sprue 27 of the first mold 21. As the resin material 9, a polyolefin-based thermoplastic bonding resin was used. By injecting the molten resin material 9 into the bonding gap 26 and dissipating the heat of the resin material 9, the resin material 9 is solidified and has a shape that is long in the axial direction along the slit mating surface of the tube-shaped sheet 7. The joining and wiring units 8 are integrated, and the connecting portions 13 shown in FIG. 2A are also integrally formed on both end faces in the axial direction of the tube-shaped sheet 7 tubularly wound around the core rod 24. Seal with resin.

The lead wire 10 drawn out from the wiring unit 8 during this molding is housed in the wiring relief space 28 provided by the configuration of the mold as shown in FIG. 11, and the outer edge portion 29 of the wiring relief space 28 is accommodated. Since the mold is in contact with the holder 11, the molten resin material 9 does not flow into the wiring escape space 28.

After the resin material 9 is cooled and solidified, the mold is opened as shown in FIG. 12, the slide cores 23a and 23b are opened, and the core rod 24 is further pulled out from the molded product as shown in FIG. , Obtain a wiring-integrated resin pipe 4.

In this wiring-integrated resin pipe 4, a rectangular tube-shaped sheet 7 is wound around a core rod 24 to constrain the cross-sectional shape to a tubular shape, and further, the mating surface of the tube-shaped sheet 7 and the wiring unit 8 are cooled and solidified. It is joined and integrated with the resin material 9.

When the diameter of the lead wires 10 is d and the required number of the lead wires 10 is n, the holder 11 has a width (d + 0.2 mm or more) × n, and the intervals between the lead wires 10 are such that the adjacent lead wires 10 maintain insulation. The thickness is (d + 0.2 mm or more), and the axial length in the longitudinal direction is equal to or longer than the required wiring distance by the lead wire 10. The depth of the groove 12 is d / 2 or more, and the shape of the holder 11 is width 13 mm × height 2 mm × length 344 mm, distance between wires 3 mm, wire diameter d = 1 mm, and groove 12 depth 0.8 mm. did.

According to such a configuration, the product weight at the time of manufacturing the wiring-integrated pipe with the same material, the same inner diameter, and the same distance wiring can be reduced by about 45% with respect to the weight of the pipe product by the conventional manufacturing method. Moreover, when comparing the structures having the same inner diameter, the outer diameter of the pipe after the wiring was integrated could be reduced by about 9%.

Further, not only the axial slit mating surface of the tube-shaped sheet 7 but also both end surfaces of the tube-shaped sheet 7 are covered with the connecting portion 13 of the resin material 9 and sealed with resin, so that the cross-sectional shape is tubular. It was possible to restrain distortion and deformation from both ends of the tube-shaped sheet 7, and it was possible to manufacture a resin pipe having a high degree of roundness.

Since the wiring-integrated thermoplastic resin pipe of the present invention can integrate the wiring into the pipe in the same cycle time as the conventional injection molding, it is also applicable to mass production of pipe materials that require wiring. it can.

A multilayer fiber reinforced resin sheet having a woven fabric layer was used for the tube-shaped sheet 7, but the configuration is not particularly limited as long as it is a sheet material that can be wound around the core rod 24 in a tube shape. Alternatively, a laminated sheet having a plurality of layers, a prepreg including a woven layer composed of reinforcing fibers, and the like may be used, and the present invention is not particularly limited.

Further, although the pipe-shaped sheet 7, the holder 11 having the groove 12, and the resin material 9 for joining were used, the combination thereof is not particularly limited, and the pipes are integrated by using sheets and holders of different systems and the joining resin. It may be manufactured, and the combination is not limited as long as it can be joined by injection molding.

Further, the lead wire 10 drawn out of the pipe is bent at 90 ° and pulled out, but the drawing angle is not particularly limited and may be set to an arbitrary angle.

(Embodiment 2)
14 to 19 show the second embodiment of the present invention.

In the first embodiment, the holder 11 of the wiring unit 8 has a flat shape as shown in FIG. 8A before being set on the core rod 24. However, in the second embodiment, the holder 11 has a flat shape as a whole. It differs from the first embodiment in that the holder 11 whose overall shape is curved in the longitudinal direction is set on the core rod 24 and molded. The same components as those in the first embodiment will be described by using the same reference numerals.

The shape of the holder 11 curved in the longitudinal direction is the one used in the first embodiment, which has a width of 13 mm, a height of 2 mm, a length of 344 mm, a distance between wires of 3 mm, a wire diameter of 1 mm, and a groove depth of 0.8 mm. A product with a radius of curvature of 350 mm was manufactured. As shown in FIG. 14B, the curved holder 11 is formed with steps by forming convex portions 30 over the entire length of the holder 11 on both side surfaces. A convex portion 31 that engages with the convex portion 30 of the holder 11 set as shown in FIG. 15 is formed on the inner surface of the concave portion 25 of the core rod 24. The concave portion 25 has a shape in which the upper surface is narrow and the lower surface is wide.

When the holder 11 of the wiring unit 8 is set on the core rod 24, the upper surfaces of the convex portions 30 and 30 at one end of the holder 11 are engaged with the lower surfaces of the convex portions 31 and 31 of the core rod 24 and curved. By setting the holder 11 while sliding it from one end of the core rod 24, the shape of the holder 11 can be elastically deformed from a curved shape to a straight shape by the recess 25 having a straight cross-sectional shape and inserted.

After winding the tube-shaped sheet 7 in a substantially tube shape around the outer circumference of the core rod 24 in which the wiring unit 8 having the curved holder 11 is set, the tube shape is formed by the slide cores 23a and 23b as in the first embodiment. The outer peripheral surface of the sheet 7 is restrained. Then, the molten resin material 9 is injected and filled from the sprue 27 of the first mold 21 in the same manner as in the first embodiment. After the filled resin material 9 has cooled and solidified, the core rod 24 is pulled out from the molded product.

In the second embodiment, due to the effect of the restoring elastic force of the holder 11 that tries to return to the original curved state by pulling out the core rod 24 from the molded product, it is generated axially on the joining gap 26. The amount of warpage inward of the pipe could be reduced by 5% as compared with the case of the first embodiment, and the wiring-integrated resin pipe 4 having a high cylindricity could be manufactured.

The details are shown below.

When the holder 11 is not curved, the entire bonding resin is thermally shrunk when the molten resin material 9 injected into the bonding gap 26 changes to the cooled / solidified bonding resin 9A.

Further, the axially both end surfaces 7A of the tubular sheet 7 wound in a tubular shape are restrained and sealed by the cooling and solidifying bonding resin 9A, and as shown in FIG. 17A, the pipe center from both axial ends. Shrinkage stress 32 is generated toward. However, since the tube-shaped sheet 7 having a woven layer made of reinforcing fibers does not melt, the state change of cooling and solidification does not occur, and the heat shrinkage of the bonding resin 9A cannot be followed. Therefore, the molded product is warped as shown in FIG. 17B in the axially long direction on the joining gap 26 provided on the slit mating surface of the tube-shaped sheet 7.

On the other hand, in the second embodiment, since the holder 11 itself is curved, the slide cores 23a and 23b are opened after molding and the core rod 24 is pulled out, so that the molded product has a holder as shown in FIG. 18A. A restoring force 33 that tends to return the 11 to the curved state is generated in the entire region that is long in the axial direction to the bonding resin 9A that is injected into the slit mating surface of the tube-shaped sheet 7 and cooled and solidified.

As a result, the force that tends to warp inward on the joining gap 26 can be repelled from the inside as shown in FIG. 18B, and the amount of warpage in the axial direction of the wiring-integrated resin pipe 4 can be reduced. it can.

The curvature of the holder 11 can be freely set within a range in which the holder 11 is not cracked or cracked when it is slid into the recess 25 of the core rod 24 and inserted for correction.

Further, the structure may be such that the holder 11 of the wiring unit 8 can be restrained flat when the core rod 24 is inserted while sliding. For example, as shown in FIG. 19, the total length of the holder 11 is on both side surfaces of the curved holder 11. A combination of forming a half-moon-shaped concave portion 34 over the entire portion and providing a crescent-shaped convex portion 35 that engages with the concave portion 34 inside the concave portion 25 of the core rod 24 is not particularly limited.

Further, in order to restrain the curved holder 11 flatly, the curved holder 11 is engaged with the flat recess 25 of the core rod 24, but the holder 11 itself is flat as in the first embodiment. However, it can also be carried out by engaging with the flat recess 25 of the core rod 24.

(Embodiment 3)
20 (a), (b) and (c) show the third embodiment of the present invention.

In each of the above embodiments, both sides of the lead wire 10 are bent by 90 ° and pulled out from the vicinity of both ends of the wiring-integrated resin pipe 4, but the drawing position to the outside of the pipe is not particularly limited. Specifically, as shown in FIG. 20 (a), a groove shape 12A in which a plurality of lead wires 10 can be arranged in a straight line, and a groove shape 12B in which the lead wires 10 can be arranged diagonally as shown in FIG. 20 (b). As shown in FIG. 20 (c), the lead wire 10 is embedded in a straight shape without being bent at an arbitrary position, and structurally with a sheet or a resin for joining, such as a through groove shape 12C for drawing out wiring from the axial end face of the pipe. If there is no interference, the required number of wires can be manufactured from any position in various groove shapes, and the lead wire 10 that has passed through a free path from various positions can be pulled out of the pipe. The number of grooves determined by the number n of the conducting wires 10 is also not limited. According to such a configuration, it is possible to handle complicated wiring and when the position to be drawn out is different for each lead wire.

(Embodiment 4)
In the holder 11 of each of the above embodiments, only the groove into which the lead wire 10 is inserted is formed on the surface on the side of the joining gap 26, and both sides of the groove are smooth flat surfaces. As shown in a), the protrusion shape 36 may be provided in a place other than the groove portion, or as shown in FIG. 21B, the surface texture of the joint surface may be intentionally roughened.

According to such a configuration, the anchor effect of the resin material 9 is exhibited on the holder surface by providing the protrusions or roughening the surface texture, and the bonding strength is improved.

(Embodiment 5)
The holder 11 of each of the above embodiments is formed with grooves 12 or 12A, 12B, 12C into which the lead wire 10 is inserted, but as shown in FIGS. 22 (a) and 22 (b), only both ends of the lead wire 10 are electrically connected. It is also possible to pull out from the holder 11 made of the insulating material and bury the lead wire 10 in the electrically insulating material except for both ends.

It should be noted that a plurality of the above embodiments can be combined at the same time.

The present invention contributes to mass production of wiring-integrated resin pipes used in various devices.

1 Vacuum cleaner body 2 Suction nozzle 3 Hose 4 Wiring integrated resin pipe 5 Hand operation part 6 Slit 7 Pipe shape sheet 8 Wiring unit 9 Resin material 9A Cooled and solidified bonding resin 10 Lead wire 11 Holder 12 Groove 12A, 12B, 12C Groove Shape 13 Connection part 14 Connection part 13 window 21 First mold 22 Second mold 23a, 23b Slide core 24 Core rod 25 Core rod 24 recess 26 Joint gap 27 First mold 21 sprue 28 Wiring escape space 29 Outer edge of wiring escape space 28 30 Convex part of holder 11 31 Convex part of core rod 24 32 Shrinkage stress from both ends in the axial direction toward the center of the pipe 33 Restoring force of holder 11 34 Concave part of holder 11 35 Convex of core rod 24 Part 36 Protrusion shape provided on the joint surface of the holder 11 37 Roughened surface provided on the joint surface of the holder 11

Claims (4)

A tube-shaped sheet that has a substantially tubular shape with a gap so that slits are formed between both ends in the lateral direction.
A wiring unit arranged on the tube-shaped sheet inside the slit along the longitudinal direction of the slit.
It has a resin material that fills the gap formed by the mating surface of the slit of the tube-shaped sheet and the wiring unit and seals the mating surface of the slit of the tube-shaped sheet.
The wiring unit has a wiring lead wire and a holder into which the lead wire is inserted.
The lead wire is laid inside the wiring unit in the longitudinal direction.
Wiring integrated resin pipe. In the wiring unit, the cross section perpendicular to the axial direction of the holder has a stepped or uneven shape.
The wiring-integrated resin pipe according to claim 1. The wiring unit has the holder in which the groove for inserting the lead wire for wiring is formed.
The groove into which the lead wire is inserted is filled with the resin material.
The wiring-integrated resin pipe according to claim 1. When the diameter of the conducting wire is d and the required number of the conducting wires is n,
The width of the holder is (d + 0.2 mm or more) × n, and the intervals between the wires are arranged so that the adjacent wires are insulated.
The thickness of the holder is (d + 0.2 mm or more), the depth of the groove is d / 2 or more, and the axial length is the required wiring distance.
The wiring-integrated resin pipe according to claim 3.

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