JP4406131B2 - Golf club head and manufacturing method thereof - Google Patents

Golf club head and manufacturing method thereof Download PDF

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Publication number
JP4406131B2
JP4406131B2 JP32032999A JP32032999A JP4406131B2 JP 4406131 B2 JP4406131 B2 JP 4406131B2 JP 32032999 A JP32032999 A JP 32032999A JP 32032999 A JP32032999 A JP 32032999A JP 4406131 B2 JP4406131 B2 JP 4406131B2
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Prior art keywords
head
golf club
club head
epoxy resin
ball
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JP32032999A
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JP2001137393A (en
Inventor
喜春 沼田
巧 石森
恒男 高野
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三菱レイヨン株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club head, and more particularly to a hollow wood type golf club head.
[0002]
[Prior art]
In wood-type golf clubs such as drivers, spoons, and buffies, the distance and controllability (direction) of the ball is important. It is known that the ball flight distance and controllability are greatly influenced by the moment of inertia around the center of gravity of the golf club head, and since the moment of inertia increases in proportion to the volume of the head, recently, The club heads of wood type golf clubs such as drivers, spoons, buffies, etc. are mainly hollow type made of metal materials such as stainless steel, titanium alloy, aluminum high strength alloy to increase the moment of inertia. The head itself is getting larger.
In such a head, the flight distance is longer than that of a solid type head represented by a conventional Persimmon head, the sweet spot is enlarged, and the bend of the hit ball is reduced.
[0003]
[Problems to be solved by the invention]
However, since the above-described metal material has a large specific gravity, it is necessary to reduce the thickness of the head in order to increase the volume of the hollow portion of the club head and increase the moment of inertia of the entire head. There is a limit.
[0004]
An object of the present invention is to solve the above problems. That is, the object of the present invention is to provide a hollow type head having a larger moment of inertia while maintaining a sufficient strength of the head of the golf club. An object of the present invention is to provide a golf club head suitable for a driver or the like having a small size.
[0005]
[Means for Solving the Problems]
Such problem is a hollow golf club head body, the golf club head sole in the hollow portion of the body - Ri Do and a weight distribution member that is disposed along the hollow part inner wall near the crown boundary, the golf club head body Is formed from a fiber reinforced epoxy resin prepreg, and the weight distribution member is solved by a golf club head formed from a tungsten powder-containing epoxy resin prepreg .
The golf club head preferably has a weight of 200 g or less, a volume of 300 to 900 cm 3 , a minimum thickness of the face portion of 4 mm or more, and a golf club head body having a specific strength of 290 MPa or more. It is preferable that the weight distribution member is made of a material having a specific gravity of 3 or more. The weight distribution member is preferably provided in at least a part of the hollow portion of the golf club head main body. The golf club head, the moment of inertia is 4 × 10 - is preferably 4 kg · m 2 or more. The material having a specific strength of 290 MPa or more is preferably a carbon fiber bidirectional reinforced epoxy resin. The material having a specific gravity of 3 or more is preferably a tungsten-containing epoxy resin.
The golf club head is formed by cutting a fiber-reinforced epoxy resin prepreg constituting the golf club head body and a tungsten powder-containing epoxy resin prepreg constituting the weight distribution member into necessary shapes, respectively. Thus, it can be manufactured by a method of laminating and curing the required number of sheets.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
First, the reason why the bend of the hit ball is reduced by increasing the moment of inertia of the golf club head (hereinafter referred to as “head”), thereby preventing the flight distance from being reduced.
[0007]
When a golf ball (hereinafter referred to as “ball”) is hit with a golf club, the collision force between the head and the ball is expressed by the following equation (1).
Collision force = head weight x head acceleration (1)
On the other hand, this collision force corresponds to a change in the momentum that the ball receives within the collision time, and is represented by the following equation (2).
Collision force = Ball weight × (Ball initial velocity × 2) ÷ Collision time ……… (2)
[0008]
The collision time between the ball and the head when the ball is impacted by a golf club is actually measured as 5/10000 seconds by a technique such as flash photography. On the other hand, the weight of the ball is set to 46 g. Therefore, if the initial velocity of the ball is 50 m / sec, a load of 9200 N acts on the ball at the moment of impact.
[0009]
By the way, it has been clarified by measurement that the deformation of the club shaft upon impact of the ball is zero. Therefore, at the time of impact, only exchange of kinetic energy occurs between the ball and the head, and it is estimated that a part of the kinetic energy of the head moves to the ball.
[0010]
Therefore, the flight distance of the ball is proportional to the kinetic energy of the head (ie, head weight × speed 2 ). In other words, in order to extend the flight distance, either one or both of the head weight and the head speed may be increased. However, if these are increased excessively, it is practically difficult to catch the ball at the sweet spot on the striking surface of the head.
[0011]
The sweet spot here means a point where a straight line passing through the center of gravity of the head intersects with a striking surface (face) of the head at a right angle. When the ball does not hit the sweet spot of the head, blurring occurs in the ball flying direction. Assuming that the loft angle of the face is 0 degree, the blur in the flying direction in the horizontal plane of the ball is calculated as follows.
[0012]
When the ball is hit out of the sweet spot of the head and hits the ball, a rotational torque around the vertical axis passing through the center of gravity is generated in the head, and the head rotates.
This rotational torque is calculated by the following equation. Here, it is assumed that the ball is hit 3 cm off the left or right in the horizontal plane from the sweet spot.
Rotation torque = Collision force x Distance from the center of gravity to the hitting point (3)
= 9200 × 0.03 = 276 N · m (3 ′)
The rotational energy of the head is
Rotational energy = moment of inertia x angular acceleration (4)
It is represented by
[0013]
Since the rotational energy and the rotational torque are balanced, the angular acceleration during the rotation of the head can be obtained from the equations (3 ′) and (4). Here, the inertia moment of the head is 2 × 10 −4 kg · m 2 of a general head.
Angular acceleration = 276 N · m ÷ 2 × 10 -4 kg · m 2
= 1.38 × 10 6 rad / sec 2
When the rotational speed is obtained by multiplying the angular acceleration by the collision time, it is 1.38 × 10 6 × 0.0005 = 690 rad / sec, and the rotational angle is expressed by the following equation (5), which is 9.9 degrees. Calculated.
Rotation angle = Angular acceleration x (Collision time) 2 ÷ 2 (5)
[0014]
From the above calculation, it can be seen that if the ball is hit 3 cm off the sweet spot of the head, the head rotates 9.9 degrees in 5/10000 seconds.
For this reason, the ball launch angle is shifted leftward or rightward due to the rotation of the head. According to a simple calculation, when the flight distance is 200 m, approximately 30 m is shifted leftward or rightward from the target point. Become.
[0015]
Furthermore, since the rotational movement of the head consumes a part of the kinetic energy of the head to be transmitted to the ball, the flying distance of the ball is also adversely affected. When the decrease in the flight distance is calculated, the kinetic energy of the head is expressed by weight × (head speed) 2 ÷ 2, so that if the head weight is 200 g and the head speed is 50 m / sec, the kinetic energy is 250 J. On the other hand, the rotational energy of the head is expressed by the moment of inertia × (rotational speed) 2 ÷ 2. Therefore, when the moment of inertia is 2 × 10 −4 kg · m 2 and the rotational speed is 690 rad / sec as described above, 48 J is obtained. . That is, when the head rotates at the time of striking, about 20% of the kinetic energy of the head is lost, and the flight distance is also shortened by about 20%.
[0016]
When the above theoretical calculation is performed by changing the moment of inertia of the head and the deviation of the ball from the target point and the amount of decrease in the flight distance are obtained, the results shown in the graphs of FIGS. 3 and 4 are obtained. The vertical axis in FIG. 3 represents the deviation of the ball from the target point (bend of the hit ball) when the flight distance is 200 m, and the vertical axis in FIG. 3 and FIG. 4, the horizontal axis represents the moment of inertia of the head. In the graphs of FIGS. 3 and 4, theoretical calculation was performed in the same manner as described above, assuming that the head weight was 200 g, the head speed at impact was 40 m / sec, and the deviation of the ball hit point from the sweet spot was 2 cm.
[0017]
From these graphs, it can be seen that by increasing the moment of inertia of the head, even if the ball hit point slightly deviates from the sweet spot of the head, the bending of the ball is reduced, and the decrease in flight distance is thereby reduced.
[0018]
As shown in FIG. 5, the moment of inertia in the present invention is a vertical axis H passing through the center of gravity G when the sole 2 of the head 1 is placed on a horizontal plane, that is, when it is in a normal use position. Say the moment around. In the figure, reference numeral 3 is a face, 4 is a crown, and 5 is a neck.
[0019]
This moment of inertia is measured by a two-pendant pendulum method using the apparatus shown in FIG. In FIG. 6, reference numeral 1 denotes a cross section of the head, and the head 1 is placed on a support base 6 having a known flat disk-like moment of inertia. The support base 6 is suspended from the base 8 by two wires 7 and 7.
In FIG. 6, a is 1/2 of the fixed distance of the wires 7 and 7 on the support base 6, b is 1/2 of the fixed distance of the wires 7 and 7 on the base 8, and h is the distance between the base 8 and the support base 6. Indicates distance.
[0020]
First, in this state, the support base 6 is twisted and then released to freely rotate, and the period T at that time is measured. Next, from the period T measured here, the inertia moment Ig of the head is calculated by the following equation (A).
[0021]
[Expression 1]
[0022]
As described above in detail, by increasing the moment of inertia of the head, the bend of the hit ball can be reduced, and the decrease in the flight distance can be reduced accordingly.
As a method of increasing the moment of inertia of the head, the volume of the head may be increased. However, if the weight of the head is increased unnecessarily when the volume of the head is increased, swinging or the like becomes difficult. Therefore, the upper limit of the weight of the head is practically 200 g. Therefore, in order to increase the volume while keeping the weight of the head constant, it is necessary to make the head structure hollow and to increase the volume as much as possible.
[0023]
However, for example, the head weight is 200 g, the volume that is an index indicating the size of the head is 300 cm 3 , and the large moment of inertia that is another index indicating the size of the head is 3 × 10 −4 kg · m 2. If the head is made of a metal material such as stainless steel, titanium alloy, or aluminum high-strength alloy, the thickness of the head must be reduced. As a result, the head may be destroyed by impact at the time of impact. When a larger head with a moment of inertia of 4 × 10 −4 kg · m 2 is made of these metal materials, a part with a thickness of 1 mm or less such as a face portion is generated, and the head is actually damaged at the time of impact. It was confirmed by experiments that it occurred.
[0024]
This is because the specific gravity of these metal materials is large and the specific strength (tensile strength (MPa / specific gravity)) is small. Actually, the specific strength of these metal materials is 130 to 160 MPa, and the upper limit of the moment of inertia of the head is 3 × 10 −4 kg · m 2 for a material having such a specific strength. Therefore, it is difficult to increase the inertia (moment of inertia) by increasing the size (volume) of the head in the metal material head.
[0025]
However, as can be seen from the graphs of FIG. 3 and FIG. 4, in order for the bend of the hit ball and the amount of decrease in the flight distance to be within an allowable range, at least the inertia moment of the head is 4 × 10 −4 kg · m 2. Desirably, the head volume needs to be 300 cm 3 or more in order to obtain the moment of inertia in this range.
[0026]
On the other hand, if the volume of the head is increased, the thickness of the face portion must be reduced, and such a head may be damaged when hit. Specifically, in order to prevent breakage of the hollow head when it is hit, the minimum thickness of the face portion needs to be 4 mm or more. For this purpose, a material having a specific strength of 290 MPa or more is used. As a result of examination, it has been found that the volume needs to be 900 cm 3 or less.
[0027]
That is, if it is hollow and has a weight of 200 g or less and a volume of 300 to 900 cm 3 , a practically preferable moment of inertia can be obtained. Further, by using a material having a minimum thickness of 4 mm or more and a specific strength of 290 MPa (30 kg / mm 2 ) or more as a material constituting the head body, it is relatively light in spite of having a large volume. In addition, practically sufficient strength and durability can be obtained. Furthermore, by providing a weight distribution member made of a material having a large specific gravity on the head body, the position of the center of gravity can be adjusted and the moment of inertia can be further increased efficiently.
[0028]
1 and 2 show an embodiment of a golf club head according to the present invention. A hollow golf club head main body (hereinafter referred to as the head) comprising a face portion 11, a crown portion 12, a neck portion 13 and a sole portion 14 is shown. 10) and a weight distribution member 20 provided in a part of the hollow portion 15 of the head main body 10, has a weight of 200 g or less, a volume of 300 to 900 cm 3 , The minimum wall thickness is 4 mm or more. The head body 10 is made of a material having a specific strength of 290 MPa or more, and the weight distribution member 20 is made of a material having a specific gravity of 3 or more.
[0029]
As a material having a specific strength of 290 MPa (30 kg / mm 2 ) or more, carbon fiber, glass fiber, aramid fiber, polyester fiber, etc. are impregnated with a matrix resin such as epoxy resin, unsaturated polyester resin, vinyl ester resin, etc. Although the fiber reinforced plastic is made of carbon fiber, the reinforcing fiber is preferably carbon fiber from the viewpoint of strength, and it is particularly preferable to use the carbon fiber oriented in two orthogonal directions because the impact resistance can be secured. The matrix resin is preferably an epoxy resin from the viewpoint of strength and moldability. In addition, high elasticity and high density components such as tungsten powder may be dispersed in the matrix resin to improve the vibration characteristics of the head and to improve the sound at impact.
In the case of carbon fiber bi-directionally reinforced epoxy resin using orthogonal bi-directionally oriented carbon fiber as the reinforcing fiber and epoxy resin as the matrix resin, the carbon fiber content is preferably in the range of 40 to 70% by volume. The strength is 340 to 590 MPa.
[0030]
As the carbon fiber bi-directional reinforced epoxy resin, specifically, a prepreg obtained by impregnating uncured epoxy resin into a roving cloth, a plain weave cloth, etc. made of high elastic carbon fiber, for example, “Pyrofil TR3110-340” manufactured by Mitsubishi Rayon Co., Ltd. Etc. can be used. In addition to the carbon fiber bi-directional reinforced epoxy resin, a material having a specific strength of 290 MPa or more and usable for the head main body 10 includes a C / C composite, although it is expensive.
[0031]
Furthermore, by arranging the weight distribution member 20 made of a material having a specific gravity of 3 or more on at least a part of the head body 10, a suitable center of gravity position can be easily set and the moment of inertia can be further increased. The position at which the weight distribution member 20 is disposed is not particularly limited, but is preferably a position away from the center of gravity of the head in the hollow portion 15 of the head body 10, for example, the vicinity of the boundary between the sole portion 14 and the crown portion 12. Is appropriate. 1 and 2 show a longitudinal sectional view and a transverse sectional view when the weight distribution member 20 is arranged along the inner wall in the vicinity of the sole-crown boundary portion in the hollow portion 15.
By using a high specific gravity material having a specific gravity of 3 or more and arranging the weight distribution member 20 at a position far from the center of gravity, the moment of inertia can be improved efficiently. On the other hand, if a material having a specific gravity of less than 3 is used as the weight distribution member 20 such as a carbon fiber bi-directional reinforced epoxy resin and is provided in the vicinity of the sole-crown boundary, the weight of the weight distribution member 20 is small because the specific gravity of the material is small. As the thickness increases, the weight distribution member 20 approaches the center of gravity of the head, and the moment of inertia cannot be improved efficiently.
[0032]
The material having a specific gravity of 3 or more is not particularly limited, and examples thereof include metals such as iron, copper, nickel, lead, tin, zinc, tungsten and alloys containing these having a specific gravity of 7 or more. Is preferred. These metals can be used alone, in the form of powder, granule, fiber, foil, plate, bar, lump, etc., but epoxy resin, You may use in the form which impregnated matrix resins, such as saturated polyester resin and vinyl ester resin, and the form of the prepreg which arranged carbon fiber, glass fiber, aramid fiber, polyester fiber, etc. further. As such a material, for example, a tungsten-containing epoxy resin is preferable.
As the tungsten-containing epoxy resin, a prepreg in which an epoxy resin is impregnated with a tungsten powder and a glass cloth, a tungsten content of 90% by weight and a specific gravity of 7, such as “Pyrofil TP010G-E3417” manufactured by Mitsubishi Rayon Co., Ltd., etc. Can be used.
[0033]
Since the tungsten-containing epoxy resin contains tungsten with a high specific gravity, when this is used as the weight distribution member 20, the moment of inertia can be improved efficiently with a small volume. Further, a material in which the matrix resin such as a carbon fiber bi-directionally reinforced epoxy resin is an epoxy resin is used as the head body 10, and a material in which the matrix resin such as a tungsten-containing epoxy resin is an epoxy resin is used as the weight distribution member 20. When used, the head main body 10 and the weight distribution member 20 are preferably made of the same matrix resin, and therefore can be molded integrally.
The material of the weight distribution member 20 is selected according to the desired head characteristics, and an appropriate amount is provided at an appropriate position. Using the tungsten-containing epoxy resin having a specific gravity of 7 as the weight distribution member 20, the weight distribution member 20 is disposed along the inner wall in the vicinity of the sole-crown boundary portion in the hollow portion 15 as shown in FIG. In the case, it is provided with a weight of about 5 to 100 g.
[0034]
As a method of creating the head, for example, the carbon fiber bi-directionally reinforced epoxy resin prepreg constituting the head body 10 and the tungsten powder-containing epoxy resin prepreg constituting the weight distribution member 20 are cut into necessary shapes, respectively. Then, the required number of sheets is laminated on the inner surface of the split female mold for molding. In this case, a metal film such as titanium having a small specific gravity and excellent strength may be disposed on the outermost layer. Next, when the two split female molds are combined, a tubular bag made of nylon or the like is placed inside. Next, the mold is placed in a heating furnace and heated, and at the same time, pressurized air is pressed into the bag, and the laminated prepreg is pressed against the mold and cured.
[0035]
A head main body 10 made of a carbon fiber bi-directionally reinforced epoxy resin having a carbon fiber content of 40% by volume and a specific strength of 340 MPa, and a tungsten-containing epoxy resin (as a weight distribution member 20 near the sole-crown boundary portion of the head main body 10) When a hollow head having a volume of 400 cm 3 and having a specific gravity 7) is produced, the moment of inertia is 4.2 × 10 −4 kg · m 2 , and a sufficiently large moment of inertia can be applied to the head. In this case, the thickness of the head main body 10 is 3 mm at the thinnest portion, and the minimum thickness is 6 mm at the face portion 11. There is no fear of.
[0036]
Such a golf club head has a head volume of 300 cm 3 or more, and further, a weight distribution member 20 made of a material having a specific gravity of 3 or more is provided on at least a part of the head body 10. However, the value of the moment of inertia is preferably 4 × 10 −4 kg · m 2 or more. Therefore, even when the ball is slightly deviated from the sweet spot of the face portion 11 of the head and the ball is hit, the bending of the ball is small, and the decrease in the flight distance due to the bending of the ball can be reduced.
[0037]
Further, since a material having a specific strength of 290 MPa or more is used for the head main body 20, the thickness of the head main body 10 can be increased even if the moment of inertia is increased, and destruction of the head due to impact or the like can be prevented. Can do. In particular, in the face portion 11 that receives an impact, the head volume is increased to 900 cm 3 by setting the minimum thickness of the face portion 11 to 4 mm or more so that stress is not concentrated on a part of the face portion 11. In addition, it is possible to prevent the head from being destroyed by hitting or the like.
Further, the head body 10 is provided with a metal plate on the sole 14 in order to lower the center of gravity position, a back metal is attached to move the center of gravity position rearward, a balance weight or the like in the hollow portion 15. A foam can also be provided.
[0038]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples.
(Example)
150 g of “Pyrofil TR3110-340” (carbon fiber content: 40% by volume) manufactured by Mitsubishi Rayon Co., Ltd. is used as a carbon fiber woven cloth reinforced epoxy resin prepreg, and tungsten powder-containing epoxy resin is disposed near the sole-crown boundary. 30 g of “Pyrofil TP010G-E3417” (specific gravity 7) manufactured by Mitsubishi Rayon Co., Ltd. (specific gravity 7) is used as the prepreg, and this prepreg is cut into a predetermined shape, and the required number of pieces is orthogonal to the inner surface of the split female mold for molding. At the same time, a titanium film was placed in the outermost layer, and a nylon tubular bag was placed inside when the mold was assembled and assembled.
[0039]
The female mold was placed in a heating furnace and heated at a temperature of 130 ° C. for 1 hour, and at the same time, pressurized air with a pressure of 0.4 MPa was pressed into a nylon bag. After curing, the mold was broken to obtain the target head.
[0040]
This head has a specific strength of 580 MPa, a weight of 180 g, a moment of inertia of 6.2 × 10 −4 kg · m 2 , a volume of 700 cm 3 , a minimum wall thickness of 5 mm and a loft angle of 13 mm. It was a degree.
[0041]
A carbon fiber woven epoxy resin shaft was attached to this head to obtain a golf club. This golf club was attached to a swing robot, and it was not damaged even after repeated hits 1000 times with a head speed set at 50 m / sec. In addition, when this golf club was set to a head speed of 40 m / sec and subjected to a field test using a swing robot, it was found that the ball was falling in a range of several meters at the landing point 200 m away from the tee shot point. Was confirmed.
[0042]
【The invention's effect】
As described above, the golf club head of the present invention has a very small bend of the ball when hit, compared to a conventional golf club head, and therefore, there is no decrease in flight distance, so-called a well-flight golf club that does not fly Can be obtained. In addition, since the thickness of the face portion is sufficiently secured, the club head is not damaged at the time of hitting.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a golf club head of the present invention.
2 is a cross-sectional view of the golf club head of FIG.
FIG. 3 is a graph showing the relationship between the moment of inertia and the bend of the hit ball.
FIG. 4 is a graph showing the relationship between the moment of inertia and the amount of decrease in flight distance.
FIG. 5 is an explanatory diagram for explaining the definition of the moment of inertia.
FIG. 6 is a schematic configuration diagram showing an inertia moment measuring apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Golf club head main body, 11 ... Face part, 15 ... Hollow part, 20 ... Member for weight distribution

Claims (2)

  1. A hollow golf club head body, the golf club head sole in the hollow portion of the body - Ri Do and a weight distribution member that is disposed along the hollow part inner wall near the crown boundary,
    The golf club head main body is formed of a fiber reinforced epoxy resin prepreg, and the weight distribution member is formed of a tungsten powder-containing epoxy resin prepreg .
  2. A method of manufacturing a golf club head according to claim 1,
    The fiber reinforced epoxy resin prepreg constituting the golf club head body and the tungsten powder-containing epoxy resin prepreg constituting the weight distribution member are each cut into a required shape, and a necessary number of layers are laminated in a mold and cured. A method for manufacturing a golf club head.
JP32032999A 1999-11-10 1999-11-10 Golf club head and manufacturing method thereof Active JP4406131B2 (en)

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JP4406131B2 true JP4406131B2 (en) 2010-01-27

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6425832B2 (en) * 1997-10-23 2002-07-30 Callaway Golf Company Golf club head that optimizes products of inertia
JP4251061B2 (en) 2003-10-03 2009-04-08 ブリヂストンスポーツ株式会社 Golf club head
JP2006102247A (en) * 2004-10-06 2006-04-20 Daiwa Seiko Inc Golf club
JP2006280439A (en) * 2005-03-31 2006-10-19 Daiwa Seiko Inc Golf club head
JP5161518B2 (en) * 2006-09-28 2013-03-13 ダンロップスポーツ株式会社 Golf club head

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