KR20060028078A - Device that cut preform's bur for pet-bottle - Google Patents

Abstract

The present invention relates to a device for cutting burrs formed in a PET bottle preform, wherein the upper injection hole portion of the preform P is absorbed by the vacuum adsorption mechanism 170 and moved in position, so that the lower end of the preform P is moved. In the state in which the preform insertion groove 180a of the preform fixing member 180 is inserted and fixed, the burr Pa exposed to the outside of the preform insertion groove 180a is cut by the cutting tool 700, and the burr (Pa) Since the cutting operation is performed stably, and the burr (Pa) cutting is always made uniformly, there is an effect that can greatly reduce the occurrence of defective PET bottle due to the burr cutting failure.

Description

Device that cut preform's bur for PET-bottle}             

1 is a plan view of a cutting device according to the present invention,

2 is a partial front cross-sectional view of a cutting device according to the present invention;

3 is a partial cross-sectional view showing a preform alignment transport mechanism constituting a cutting device according to the present invention;

4 is a partial cross-sectional view showing a cutting mechanism constituting a cutting device according to the present invention,

5a to 5c are views for explaining the operating state of the cutting device according to the invention,

Figure 6 is an enlarged cross-sectional view of the vacuum suction mechanism constituting the cutting device according to the present invention.

-Explanation of terms for the main parts of the accompanying drawings-

10; Preform supply line, 11; Preform release prevention cover,

20; Preform discharge lines, 31,32; Belt tensioner,

40; Rotary joint, 50; Support,

60; Vacuum supply line, 70; Vacuum feeder,

100; Rotary feed mechanism, 110; Rotation axis,

110a; Vacuum line, 111; Support member,

112; Main gear, 120; Drive motor,

130; First stereoscopic cam, 131; Cam,

140; Linear reciprocating mechanism, 141; housing,

141a; Guide hole 142; Moving shaft,

142a; Contact 142b; Roller,

143; Spring, 150; 2D Stereo Cam,

151; Cam portion 160; Air Valve,

161; ON / OFF button, 161a; Roller,

170; Vacuum suction device, 170a; Vacuum Line,

171; Fixing part, 172; Moving,

173; Spring, 180; Preform fixing member,

180a; Preform insertion groove, 400; Preform guide member,

500; Preform alignment feed mechanism, 510; Screw Shaft,

510a; Guide groove, 520; Screw shaft drive mechanism,

521; First power transmission member, 521a; Gear,

521b; Belt pulley, 522; Second power transmission member,

522a; Belt pulley, 522b; 45 ° Helical Gear,

523; Third power transmission member, 523a; 45 ° Helical Gear,

523b; Belt pulley, 600; Preform feeder,

610; Gear, 620; Preform transfer plate,

700; Cutting tool, 710; Rotary Blade,

711; Belt pulley, 712; knife,

720; Rotary blade drive mechanism, 721; Gear,

722; Belt pulley, 730; Fixed Blade,

800; Preform discharge mechanism, 900; Preform guide member,

B; Base, P; Preform,

Pa; Bur.

The present invention relates to an apparatus for cutting burrs formed in a PET bottle preform, and more particularly, to an apparatus for cutting burrs of a PET bottle preform, which enables the burr to be cut more uniformly and stably.

As is well known, a plastic bottle is prepared by injection molding a synthetic resin such as polyethylene into a preform in the form of a test tube, followed by blow molding while heating the preform.

A burr is formed on the bottom of the preform due to injection molding, and this burr causes product defects during blow molding of the preform (in the case of blow molding, the burr affects the thickness and uniformity of the PET bottle), and a separate cutting device The burr is cut | disconnected before blow molding using the.

However, in the conventional burr cutting device, the preform is rotated along the arc-shaped guide rail by a pusher which is rotated about the rotation axis in a state in which the preform is mounted on the arc-shaped guide rail for guiding the preform along the rotation path. While being pushed in the direction, the burr of the preform is cut through the fixed blade automatically, so that the burr cutting of the preform is not uniform and the cutting operation is not performed stably.

To explain this in more detail, the preform pushed in the rotational direction along the guide rail by the rotary feed mechanism swings up, down, front, back, left, and right due to the interference with the arc of the guide rail during transportation. In this state, when the burr of the preform comes into contact with the fixed blade, the burr is cut in a state in which the preform is inclined arbitrarily, so that the burr is not cut uniformly and stably. Therefore, the burr length of the cut preforms is not fixed to each other, the longer the length of the burr becomes thicker the bottom thickness of the blow-molded PET bottle, the overall thickness of the PET bottle is not constant, the defective PET bottle is greatly increased, The merchandise of the finished PET bottle was greatly reduced.

Accordingly, the present invention has been invented to solve the above problems, an object of the present invention is to provide a burr cutting device of a PET bottle preform that can be cut more uniformly and stably.

The present invention for achieving the above object is provided with a support member on the upper end, the rotating shaft rotatably installed on the base, a drive motor for forcibly driving the rotating shaft, fixed to the base via a support medium disposed on the top of the rotating shaft A rotary feed mechanism having a plurality of linear reciprocating mechanisms which are radially installed on the support member about the first rotational cam, and the rotational shaft is interlocked with the first stereoscopic cam, and linearly reciprocates vertically along the longitudinal direction of the rotational shaft; Preform guide member for guiding the supplied preform to the rotary feed mechanism; A preform alignment transfer mechanism for aligning the supplied preforms along the preform guide member at equal intervals; A preform supply mechanism for supplying the preform conveyed by the preform alignment transport mechanism to the rotary feed mechanism along the preform guide member; A cutting mechanism for cutting the burr of the preform conveyed by the rotary feed mechanism; A preform ejector for conveying the burr cut preform conveyed by the rotary feed mechanism to the preform discharge line; In the burr cutting device of the preform for PET bottles having a preform guide member for guiding the burr cut preform conveyed by the preform discharge mechanism to the preform discharge line,

The second stereo cam disposed between the first stereo cam and the rotary shaft is reinforced on the first stereo cam, and the vacuum suction mechanism for vacuum adsorption of the preform is separately installed on the linear reciprocating mechanism, and the vacuum line is provided on the rotary shaft. And an air valve which is connected to the second stereo cam to individually block the vacuum line of the rotary shaft and the vacuum suction mechanism, is radially installed on the support member about the rotary shaft, while the preform insertion groove corresponds to the vacuum suction mechanism. The preform fixing member formed radially with respect to the structure is characterized in that the reinforcement is installed on the rotating shaft located below the support member.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the burr cutting device includes a rotary shaft 110 rotatably installed on the base B with a support member 130 at an upper end thereof, and a driving motor 120 forcibly driving the rotary shaft 110. ) Is fixed to the base B via the supporter 50, and is radially installed on the support member 130 around the first stereo cam 130 and the rotation shaft 110 disposed on the upper end of the rotation shaft 110. A rotary feed mechanism (100) having a plurality of linear reciprocating mechanisms (140) interlocked with the first stereo cam (130) and linearly reciprocating vertically along the longitudinal direction of the rotary shaft (110); Preform guide member 400 for guiding the supplied preform (P) to the rotary feed mechanism (100); A preform alignment transfer mechanism 500 for aligning the supplied preforms P at regular intervals while transferring the preforms P supplied along the preform guide member 400; A preform supply mechanism 600 for supplying the preform P conveyed by the preform alignment transfer mechanism 500 to the rotary transfer mechanism 100 along the preform guide member 400; Cutting tool 700 for cutting the burr (Pa) of the preform (P) conveyed by the rotary feed mechanism (100); A preform discharge mechanism 800 for transferring the cut preform P cut by the rotary transfer mechanism 100 to the preform discharge line 20; It consists of a preform guide member 900 for guiding the cut preform (P) cut by the preform discharge mechanism 800 to the preform discharge line (20).

Here, in the burr cutting device according to the present invention, the second stereo cam (150) disposed between the first stereo cam (130) and the rotating shaft (110) is reinforced on the first stereo cam (130), and the preform ( The vacuum suction mechanism 170 for vacuum suctioning P) is individually reinforced and installed on the linear reciprocating movement mechanism 140, and the vacuum line 110a is formed on the rotation shaft 110 and interlocked with the second stereo cam 150. Thus, the air valve 160 for individually blocking the vacuum line 110a and the vacuum suction mechanism 170 of the rotary shaft 110 is radially installed on the support member 130 around the rotary shaft 110, while the preform is inserted. The preform fixing member 180 in which the groove 180a is formed radially about the rotating shaft 110 corresponding to the vacuum adsorption mechanism 170 is reinforced and installed in the rotating shaft 110 positioned below the supporting member 111. It is worth noting that it is characterized by.

According to the present invention, the upper injection hole portion of the preform (P) is adsorbed by the vacuum adsorption mechanism 170 and moved in position, and the lower end of the preform (P) is inserted and fixed in the preform insertion groove (180a) of the preform fixing member 180 In the opened state, since the burr Pa exposed to the outside of the preform insertion groove 180a is cut by the cutting tool 700, the burr cutting operation is stably performed, and the burr cutting is always uniform. Will be done.

In addition, when the vacuum pressure supply to the vacuum suction mechanism 170 is controlled using the second stereo cam 150 and the air valve 160 mechanically interlocked therewith, the vacuum line to the vacuum suction mechanism 170 is controlled. It is greatly simplified, and the vacuum pressure supply control to the vacuum suction device 170 can be quickly performed.

Connection between the rotary shaft 110 and the drive motor 120 may be made in various forms, as shown in Figure 2, the main gear 112 is installed on the rotary shaft 110, the drive shaft of the drive motor 120 By installing the drive gear 121, the main gear 112 of the rotary shaft 110 and the drive gear 121 of the drive motor 120 is directly engaged with each other, it is possible to minimize the power loss. Here, reference numeral "60" denotes a vacuum pressure supply line, and reference numeral "40" denotes a known rotary joint connecting the rotary shaft 110 and the vacuum pressure supply line 60 to each other. In addition, reference numeral "70" indicates a vacuum pressure supply that generates a vacuum pressure by itself and supplies a vacuum pressure to the vacuum line 110a of the rotating shaft 110 through the vacuum pressure supply line 60. The pneumatic feeder 70 is only a component that can optionally be provided as needed.

1 and 3, a screw shaft 510 and a screw shaft drive mechanism 520 for driving the screw shaft 510 are used as the preform alignment transfer mechanism 500, and the screw shaft 510 is used. In order to be directly interlocked mechanically with the rotary shaft 110, the power transmission members mechanically engaged with the rotary shaft 110 of the rotary feed mechanism 100 to transfer power from the rotary shaft 110 to the screw shaft 510 ( A power transmission mechanism consisting of 521,522,523 is used as the screw shaft drive mechanism 520. The power transmission path of the preform alignment transfer mechanism 500 includes the main gear 112 of the rotary shaft 110 → the gear 521a of the first power transmission member 521 and the belt pulley of the first power transmission member 521. → belt → pulley 522a of second power transmission member 522 → 45 ° helical gear 522b of second power transmission member 522 → 45 ° helical of third power transmission member 523 Gear 523a → Belt pulley 523b of the third power transmission member 523 → Belt → Belt pulley (see Fig. 1) → Screw shaft 510 of the screw shaft 510. In the case of this embodiment, as shown in Figs. 1 and 3, the preform alignment transfer mechanism 500 which is driven by mechanically engaged with the rotary shaft 110 of the rotary transfer mechanism 100, but in some cases Of course, it is also possible to use a preform alignment transfer mechanism that is driven separately from the rotary transfer mechanism 100 by separate driving means. Here, reference numeral "31" is a belt tension regulator for maintaining a constant tension of the belt connecting the third power transmission member 523 and the screw shaft 510, and reference numeral "11" is a preform supply line ( 10 shows a preform escape preventing cover 11 for preventing the preforms P, which are inclined at a predetermined angle, from being pressed by a load and being separated from the preform supply line 10.

In the case of this embodiment, as shown in Figs. 1 and 2, the mechanically engaged with the rotary shaft 110 of the rotary feed mechanism 100 is used as the preform supply mechanism 600, but in some cases Of course, it is also possible to use a preform supply mechanism that is driven separately from the rotary feed mechanism 100 by a separate driving means. 1 and 2, the preform supply mechanism 600 includes a gear 610 meshed with and coupled to the main gear 112 of the rotation shaft 110, and a preform conveyed by the preform alignment transfer mechanism 500. A preform conveying plate 620 for sequentially transferring P) to the rotary conveying mechanism 100 along the preform guide member 400 forms a structure provided at both ends.

1 and 4, the rotary blade 710 rotatably installed on the base (B), the rotary blade drive mechanism 720 for driving the rotary blade 710 and fixed to the base (B) to rotate Although the cutting tool 700 is formed of a fixed blade 730 disposed to face the blade 710, the present invention is not limited thereto, but the preform is transferred to the preform insertion groove 180a in a fixed state. Of course, all of the known ones capable of cutting the burr Pa of P) may be used as the cutting tool 700. For example, using a pair of fixed blades (see "730") disposed opposite to each other as the cutting tool 700, while the preform (P) is inserted and fixed in the preform insertion groove (180a), the preform The burr Pa of (P) is cut while passing between a pair of fixed blades, or by using only one fixed blade (see "730") as the cutting tool 700, the burr Pa is fixed by one. Using a pair of rotary blades (see "710"), which are arranged to face each other or are opposed to each other and forcedly rotated by the rotary blade driving mechanism, as the cutting tool 700, a pair of burrs Pa is used. It can also be cut while passing between the rotary blades. Of course, a non-driven rotary blade that is idling without a separate rotary blade drive mechanism may be used as the cutting mechanism 700, of course. In addition, in the present embodiment, as shown in Figures 1 and 4, by mechanically engaging the rotary shaft 110 of the rotary feed mechanism 100 to transfer the power from the rotary shaft 110 to the rotary blade 710. Although the power transmission mechanism is used as the rotary blade drive mechanism 720, the rotary blade 710 is mechanically engaged with the rotary shaft 110 of the rotary feed mechanism 100, but in some cases the rotary blade 710 ) May be driven separately from the rotary feed mechanism 100 by a rotary blade drive mechanism having its own power source. Here, reference numeral 32 denotes a belt tension controller for maintaining a constant tension of the belt connecting the rotary blade 710 and the rotary blade drive mechanism 720.

Since the preform discharge mechanism 800 is the same as the preform supply mechanism 600, a description thereof will be omitted instead of the description of the preform supply mechanism 600. In addition, although not shown, the preform discharge line 20 is inclined at a predetermined angle (in the opposite direction of the preform supply line) so that the preforms P discharged by the preform discharge mechanism 800 may naturally fall. .

As the first stereo cam 130, the moving shaft 142 of the linear reciprocating mechanism 140 (refer to FIGS. 5A to 5C) is rotated about the rotation shaft 110 and moved in a vertical reciprocating direction in a vertical direction. All known three-dimensional cams may be applied, and the second stereo cam 150 may likewise have an ON / OFF button 161 (see FIGS. 5A to 5C) of the air valve 160 about the rotation shaft 110. All known three-dimensional cams to be linearly reciprocated in the vertical direction while being rotated to move the position can be applied. In the present embodiment, as shown in Figs. 2 and 4 and 5A to 5C, the cross-sectional cam is used as the first stereo cam 130 and the second stereo cam 150. As described above, the present invention is not limited thereto, and well-known three-dimensional cams such as a swash plate cam or a cylindrical cam may be used as the first three-dimensional cam 130 and / or the second three-dimensional cam 150.

In the present embodiment, as the linear reciprocating mechanism 140, as shown in Figures 5a to 5c, the guide hole 141a is formed to be fixed to the support member 111 and the housing ( A moving shaft exposed to the outside through the guide hole 141a of the 141 and contacting the cam portion 131 of the first stereo cam 130 to be inserted into and fixed to the housing 141. 142 and a spring 143 that supports the moving shaft 142 in one direction so that the contact portion 142a of the moving shaft 142 abuts against the cam portion 131 of the first stereo cam 130. . The linear reciprocating movement mechanism 140 is also not limited to this embodiment, but may be modified in various forms known as necessary. Here, reference numeral "142b" is a roller which is rotatably installed in the contact portion 142a in order to reduce interference between the contact portion 142a of the moving shaft 142 and the cam portion 131 of the first stereo cam 130. Unexplained reference numeral "161a" is rotatably installed in the ON / OFF button 161 to reduce the interference between the ON / OFF button 161 of the air valve 160 and the cam portion 151 of the second stereo cam 150. Indicates a roller. The ON / OFF button 161 is elastically supported in one direction by a spring (not shown) built in the air valve 160 to maintain a state facing the cam portion 151 of the second stereo cam 150.

Referring to the operating state of the burr cutting device of the PET bottle preform according to the present invention.

First, the preform P introduced into the preform guide member 400 through the preform supply line 10 is transferred along the preform guide member 400 by the preform alignment transfer mechanism 500, and then the preform supply mechanism ( 600 is fed along the preform guide member 400 and supplied to the rotary feed mechanism 100.

5A is a view illustrating a state before the vacuum suction device 170 reaches a position for vacuum suction of the preform P. Referring to FIG. According to this, based on the preform P supplied to the rotary transfer mechanism 100 (based on the preform P shown in FIG. 5A), the vacuum suction mechanism 170 is spaced apart from the preform P by a predetermined distance. As it is lifted upwards, the ON / OFF button 161 of the air valve 160 is also lifted upwards so that the connection between the vacuum line 110a of the rotary shaft 110 and the vacuum suction device 170 is blocked. .

In the state as shown in FIG. 5A, when the vacuum suction device 170 is transferred to a position for vacuum suction of the preform P, the vacuum suction device 170 gradually descends, and the air valve 160 is turned on / off. The button 161 is also gradually lowered, as shown in FIG. 5B, the intake port of the vacuum suction device 170 is inserted into the inlet of the preform P, and the air valve 160 is turned ON so that the rotary shaft 110 is rotated. Vacuum pressure from the vacuum line (110a) of the) is transmitted to the vacuum suction device (170).

As shown in FIG. 5B, the preform P adsorbed and fixed to the vacuum adsorption mechanism 170 is later rotated about the rotation shaft 110 after exiting from the preform guide member 400 to form a burr Pa. It is moved to a position for cutting, that is, the cutting tool 700.

The vacuum suction mechanism 170 moved to a position for cutting the burr Pa is gradually lowered, and as shown in FIG. 5C, the bottom surface of the preform P is formed on the preform fixing member 180. It is inserted into and fixed to the preform insertion groove 180a and passes through the cutting tool 700. Therefore, the burr Pa of the preform P is fixed to the cutting tool 700 while the upper and lower portions of the preform P are firmly fixed by the vacuum suction mechanism 170 and the preform fixing member 180, respectively. Is cut by

Thereafter, the vacuum suction device 170 is rotated about the rotation shaft 110 and moved to the preform discharge device 800. As such, the vacuum suction mechanism 170 which is moved to the preform discharge mechanism 800 is gradually raised in the state shown in FIG. 5C to return to the initial position, and the ON / OFF button 161 of the air valve 160 is also Since it is gradually raised and returned to the initial position, the preform P cut out of the burr (Pa) is pulled out of the preform insertion groove 180a of the preform fixing member 180 and then separated from the vacuum suction mechanism 170 to be preform guide. It is injected into the member 900.

The preform P cut into the burr (Pa) introduced into the preform guide member 900 is then transported along the preform guide member 900 by the preform discharge mechanism 800 and discharged to the preform discharge line 20. The preform P discharged to the preform discharge line 20 naturally falls along the inclined preform discharge line 20 and is then transferred to the next process.

On the other hand, the linear reciprocating mechanism 140 is not provided with a method for absorbing the shock due to the interference between the vacuum suction mechanism 170 and the preform (P), the vacuum suction mechanism 170 is a preform (P) There is a risk of damage to the preform (P) due to the impact generated when adsorbing.

In this case, however, as shown in FIG. 6, the fixing part 171 fixed to the linear reciprocating moving mechanism 140 and the moving part 172 fixed to the fixing part 171 to be capable of linear reciprocating in the vertical direction. And a vacuum suction member 170 disposed between the fixing part 171 and the moving part 172 and including a spring 173 that supports the moving part 172 in one direction. It is easy to solve.

The present invention is not limited to the embodiment as described above, and of course, various modifications can be made without departing from the scope of the following claims.

According to the present invention as described above, while the upper injection port portion of the preform (P) is absorbed by the vacuum suction mechanism 170 and moved in position, the lower end of the preform (P) preform insertion groove of the preform fixing member 180 ( In the fixed state inserted into the 180a, the burr Pa exposed to the outside of the preform insertion groove 180a is cut by the cutting tool 700, so that the burr cutting operation is stably performed. Since the cutting of the burr (Pa) is always made uniformly, there is an effect that can greatly reduce the occurrence of defective PET bottle due to the burr cutting failure.

In addition, when the vacuum pressure supply to the vacuum suction mechanism 170 is controlled using the second stereo cam 150 and the air valve 160 mechanically interlocked therewith, the vacuum line to the vacuum suction mechanism 170 is greatly increased. On the other hand, it is possible to quickly perform a vacuum pressure supply control to the vacuum suction mechanism 170, there is an advantage that the processing speed of the cutting device due to the vacuum pressure control speed is prevented from being lowered.

Claims (6)

The base member B has a support member 130 at an upper end thereof, and the base shaft B is rotatably installed on the base B, a drive motor 120 forcibly driving the rotation shaft 110, and a support 50. The first three-dimensional cam 130, which is fixed to the rotation shaft 110 is disposed on the top, the radially installed on the support member 130 around the rotary shaft 110 is interlocked with the first three-dimensional cam 130, the rotary shaft ( A rotary feed mechanism (100) having a plurality of linear reciprocating mechanisms (140) linearly reciprocating vertically along the longitudinal direction of (110); Preform guide member 400 for guiding the supplied preform (P) to the rotary feed mechanism (100); A preform alignment transfer mechanism 500 for aligning the supplied preforms P at regular intervals while transferring the preforms P supplied along the preform guide member 400; A preform supply mechanism 600 for supplying the preform P conveyed by the preform alignment transfer mechanism 500 to the rotary transfer mechanism 100 along the preform guide member 400; Cutting tool 700 for cutting the burr (Pa) of the preform (P) conveyed by the rotary feed mechanism (100); A preform discharge mechanism 800 for transferring the cut preform P cut by the rotary transfer mechanism 100 to the preform discharge line 20; In the burr cutting device of the preform for PET bottles having a preform guide member 900 for guiding the cut preform (P) to be carried by the preform discharge mechanism 800 to the preform discharge line 20, The second three-dimensional cam 150 disposed between the first three-dimensional cam 130 and the rotating shaft 110 is reinforced to the first three-dimensional cam 130, the vacuum suction mechanism 170 for vacuum adsorption of the preform (P) ) Is installed to reinforce separately to the linear reciprocating mechanism 140, the vacuum line (110a) is formed on the rotary shaft 110, the vacuum line (110a) of the rotary shaft 110 is linked to the second stereo cam (150) An air valve 160 for individually blocking the vacuum suction mechanism 170 is radially installed on the support member 130 about the rotating shaft 110, while the preform insertion groove 180a is the vacuum suction mechanism 170. Corresponding to the rotating shaft 110, the preform fixing member 180 is formed radially to the burr cutting device for PET bottle preform, characterized in that the reinforcement is installed on the rotating shaft 110 located below the support member 111 . The method of claim 1, wherein the preform alignment transfer mechanism 500, the preform supply mechanism 600, or the preform discharge mechanism 800 is driven in mechanical engagement with the rotary shaft 110 of the rotary transfer mechanism 100. Burr cutting device for preforms for PET bottles. According to claim 1, The cutting tool 700 is a rotary blade 710 rotatably installed on the base (B), a rotary blade drive mechanism 720 for driving the rotary blade 710, and the base ( B) Burr cutting device of the preform for PET bottles, characterized in that the fixed blade 730 is fixed to the rotating blade 710 is disposed to be opposed to. The power transmission device of claim 3, wherein the rotary blade drive mechanism 720 mechanically engages the rotary shaft 110 of the rotary feed mechanism 100 to transmit power from the rotary shaft 110 to the rotary blade 710. Burr cutting device for preforms for PET bottles, characterized in that the mechanism. According to claim 1, wherein the vacuum suction mechanism 170, the fixed portion 171 is fixed to the linear reciprocating movement mechanism 140, and the movement is fixed to the fixed portion 171 so that the linear reciprocating movement in the vertical direction Burr cutting device for a PET bottle preform, characterized in that the portion 172, and a spring (173) disposed between the fixed portion 171 and the moving portion 172 to support the moving portion 172 in one direction. The PET bottle according to any one of claims 1 to 5, wherein the first three-dimensional cam 130 and / or the second three-dimensional cam 150 are a single-sided cam, a swash plate cam, or a cylindrical cam. Burr cutting device of preform.

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