JP7335482B2 - Mass measuring device and mass measuring method for rubber member - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus and method for measuring the mass of an extruded strip-shaped rubber member, and more particularly, to increase the degree of freedom in the cross-sectional shape of the strip-shaped rubber member to be measured, and to accurately measure the mass of the rubber member. The present invention relates to a mass measuring device and a mass measuring method for a rubber member that enable good measurement.

Tire constituent members such as tread members and side members used in pneumatic tires are obtained by cutting extruded strip-shaped rubber members into predetermined lengths. Tire components cut to size in this manner do not always have a mass that matches the target value. In other words, even if the belt-shaped rubber member is cut into a fixed length, the mass of each tire component may vary due to variations in extrusion conditions and expansion and contraction of the rubber member.

On the other hand, as a method for measuring the mass of a strip-shaped rubber member, the cross-sectional area of the rubber member is calculated based on the distance between a pair of roller heads that roll the strip-shaped rubber member, the rubber width of the rubber member, and the shape of the roller head. Calculate the extrusion speed of the rubber member based on the rotation speed of the roller head, measure the temperature of the rubber member with a temperature sensor, and measure the mass of the rubber member based on the cross-sectional area, extrusion speed and temperature of the rubber member (see, for example, Patent Document 1).

However, if the rotational speed of the roller head is used to calculate the extrusion speed of the rubber member, slippage between the roller head and the rubber member may cause measurement errors in the rotational speed. This is a factor that lowers the accuracy of mass measurement. In addition, when using the spacing and shape of the roller head to calculate the cross-sectional area of the rubber member, the cross-sectional shape of the rubber member to be measured is limited by the spacing and shape of the roller head. There is also a drawback that the degree is lowered.

JP 2006-116835 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber member mass measuring apparatus and a mass measuring method capable of increasing the degree of freedom in the cross-sectional shape of a band-shaped rubber member to be measured and capable of accurately measuring the mass of the rubber member. to do.

In order to achieve the above object, the rubber member mass measuring apparatus of the present invention comprises a conveying device that continuously conveys a band-shaped rubber member along its longitudinal direction, and the conveying device that is interrupted in the conveying route of the rubber member. a pair of non-contact type profile sensors arranged to sandwich the rubber member from both sides at a mass measurement position set at a position set to a position corresponding to the mass measurement position, and measuring the cross-sectional area of the rubber member; and the rubber member at the mass measurement position. a non-contact speed sensor for measuring the speed of, a non-contact temperature sensor for measuring the temperature of the rubber member at the mass measurement position, the profile sensor, the speed sensor, and the temperature sensor based on measurement data a computing device for temporally computing the mass per unit time of the rubber member in the conveying state and computing the integrated value of the mass per unit time; A rubber member mass measuring device comprising a cutting device that is installed downstream and uses the integrated value to cut the rubber member to a desired mass,
The rubber member is arranged to sandwich the rubber member from both sides at a correction condition measurement position set upstream of the mass measurement position in the transport path of the rubber member and at a portion where the transport device is interrupted. A pair of non-contact correction profile sensors for measuring the cross-sectional area of the rubber member, a non-contact correction speed sensor for measuring the speed of the rubber member at the correction condition measurement position, and the rubber at the correction condition measurement position and a non-contact correction temperature sensor for measuring the temperature of the member, and the calculation device calculates the integration using the measurement data of the correction profile sensor, the correction speed sensor, and the correction temperature sensor as correction terms. It is characterized by correcting the mass per unit time of the rubber member that is used in the calculation of the value .

Further, the method for measuring the mass of a rubber member according to the present invention for achieving the above object is provided by continuously conveying a strip-shaped rubber member along its longitudinal direction, and the conveying device is interrupted in the conveying path of the rubber member. The cross-sectional area of the rubber member is measured by a pair of non-contact profile sensors arranged so as to sandwich the rubber member from both sides at the mass measurement position set at the site, and the non-contact velocity is measured at the mass measurement position. The speed of the rubber member is measured by a sensor, the temperature of the rubber member is measured by a non-contact temperature sensor at the mass measurement position, and transport is performed based on the measurement data of the profile sensor, the speed sensor, and the temperature sensor. The mass per unit time of the rubber member in the state is calculated over time, the integrated value of the mass per unit time is calculated, and the device is installed downstream of the mass measurement position in the conveying route of the rubber member. A method for measuring the mass of a rubber member by cutting the rubber member to a desired mass by using the integrated value with a cutting device,
A pair of corrective components arranged to sandwich the rubber member from both sides at a correction condition measuring position set upstream of the mass measuring position in the conveying path of the rubber member and at a portion where the conveying device is interrupted. A cross-sectional area of the rubber member is measured by a profile sensor, a speed of the rubber member is measured by a non-contact correction speed sensor at the correction condition measurement position, and a non-contact correction temperature is measured at the correction condition measurement position. The temperature of the rubber member is measured by a sensor, and the measurement data of the profile sensor for correction, the speed sensor for correction, and the temperature sensor for correction are used as correction terms, and the integrated value is calculated as a unit of the rubber member. It is characterized by correcting the mass per time .

In the present invention, a belt-shaped rubber member is continuously conveyed along its longitudinal direction, and the cross-sectional area of the rubber member is measured by a non-contact profile sensor at a mass measurement position set on the conveying path of the rubber member, The speed of the rubber member is measured by a non-contact speed sensor at the mass measurement position, and the temperature of the rubber member is measured by a non-contact temperature sensor at the mass measurement position. Accurately measures the mass of the belt-shaped rubber member by calculating the mass per unit time of the rubber member in the transported state over time based on the measurement data and calculating the integrated value of the mass per unit time. The integrated value can be used to cut the belt-like rubber member to a desired mass.

In particular, a non-contact profile sensor is used to measure the cross-sectional area of the rubber member, a non-contact speed sensor is used to measure the speed of the rubber member, and a non-contact temperature sensor is used to measure the temperature of the rubber member. is used, the cross-sectional shape of the rubber member to be measured is not restricted, unlike the case where a contact-type sensor is used, and the degree of freedom of the cross-sectional shape can be increased. In addition, by using a non-contact profile sensor or a non-contact speed sensor, it is possible to eliminate measurement errors caused by slippage between the sensor and the rubber member, and improve the accuracy of measuring the mass of the rubber member.

In the rubber member mass measuring apparatus of the present invention, the arithmetic unit calculates the cross-sectional area A of the rubber member measured by the profile sensor and the velocity V of the rubber member measured by the velocity sensor as the mass of the rubber member per unit time. and the density ρ of the rubber member converted from the temperature T of the rubber member measured by the temperature sensor. As a result, the mass of the rubber member per unit time can be obtained with high accuracy.

Further, in the rubber member mass measuring apparatus of the present invention, it is preferable that the computing device corrects the density ρ of the rubber member using the previously obtained rubber physical properties of the rubber member as a correction term. The rubber physical properties such as viscosity and elastic modulus are acquired in advance for the rubber material to be measured, and if the rubber physical properties change due to variations in rubber compounding and processing conditions, the rubber physical properties acquired in advance are used as correction terms. By correcting the density ρ of the rubber member, it is possible to improve the measurement accuracy of the mass of the rubber member.

Further, the rubber member mass measuring apparatus of the present invention is a non-contact correction profile for measuring the cross-sectional area of the rubber member at a correction condition measuring position set upstream of the mass measuring position in the rubber member conveying path. a sensor, a non-contact correction speed sensor for measuring the speed of the rubber member at the correction condition measurement position, and a non-contact correction temperature sensor for measuring the temperature of the rubber member at the correction condition measurement position. Preferably, the computing device corrects the mass per unit time of the rubber member using the measurement data of the correcting profile sensor, the correcting velocity sensor, and the correcting temperature sensor as correction terms. In this manner, at the correction condition measurement position, the cross-sectional area of the rubber member is measured by the correction profile sensor, the speed of the rubber member is measured by the non-contact correction speed sensor, and the rubber temperature is measured by the non-contact correction temperature sensor. By measuring the temperature of the member and correcting the mass of the rubber member per unit time using the measurement data of the profile sensor for correction, the speed sensor for correction and the temperature sensor for correction as a correction term, the expansion and contraction of the rubber member in the conveying route It is possible to correct the measurement error caused by such influences and improve the measurement accuracy of the mass of the rubber member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a rubber member mass measuring device according to an embodiment (reference example) of the present invention; 4 is a graph showing the relationship between mass per unit time and time obtained by the rubber member mass measuring method according to the embodiment (reference example) of the present invention. FIG. 3 is a side view showing a rubber member mass measuring device according to another embodiment of the present invention.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a rubber member mass measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 1 , the rubber member mass measuring device of the present embodiment is a device for measuring the mass of a strip-shaped rubber member 2 extruded from an extruder 1 . Here, the case where the strip-shaped rubber member 2 is directly supplied from the extruder 1 will be described. good.

The rubber member mass measuring apparatus of this embodiment includes a conveying device 3 that continuously conveys a band-shaped rubber member 2 along its longitudinal direction, and a pair of non-contact type measuring devices that measure the cross-sectional area A of the rubber member 2. It has profile sensors 4 and 5 , a non-contact speed sensor 6 for measuring the speed V of the rubber member 2 , and a non-contact temperature sensor 7 for measuring the temperature T of the rubber member 1 . As the conveying device 3, for example, a belt conveyor is used. The profile sensors 4 and 5 are devices for optically detecting the surface shape of the object to be measured, and are arranged so as to sandwich the rubber member 2 from the upper and lower surfaces. The cross-sectional area A of the rubber member 2 is geometrically calculated based on the surface shapes of both surfaces of the rubber member 2 acquired by these profile sensors 4 and 5 . The speed sensor 6 is a device that optically detects the moving speed of the object to be measured. The temperature sensor 7 is, for example, a device that detects infrared rays emitted from an object to be measured and measures the temperature based on the amount of infrared rays. These profile sensors 4 and 5, speed sensor 6, and temperature sensor 7 all perform measurement at a mass measurement position P1 set on the conveying path of the rubber member 1. As shown in FIG. It is preferable that the measuring points of the sensors 4 to 7 coincide with each other in the longitudinal direction of the rubber member 2, but they may be slightly shifted in the longitudinal direction of the rubber member 2. Further, a cutting device 8 for cutting the rubber member 2 is installed downstream of the mass measurement position P1 in the transport path of the rubber member 2 .

Furthermore, the rubber member mass measuring apparatus of the present embodiment measures the mass M per unit time of the rubber member 2 in the conveying state over time based on the measurement data of the profile sensors 4 and 5, the speed sensor 6 and the temperature sensor 7. , and an integrated value of the mass M per unit time. The control device 10 drives the cutting device 8 based on the calculation result of the calculation device 9 to cut the rubber member 2 to have a predetermined mass. The control device 10 also uses the calculation result of the calculation device 9 as feedback to the extruder 1 . For example, when the mass M of the rubber member 2 per unit time exhibits an abnormal value, the operating speed of the extruder 1 is controlled accordingly.

Next, a method for measuring the mass of the rubber member 2 using the rubber member mass measuring apparatus described above will be described with reference to FIG. First, by driving the extruder 1, the strip-shaped rubber member 2 is continuously extruded from the extruder 1, and the transport device 3 continuously transports the strip-shaped rubber member 2 along its longitudinal direction. At that time, the cross-sectional area A of the rubber member 2 is measured by the non-contact profile sensors 4 and 5 at the mass measurement position P1 set on the conveying path of the rubber member 2, and the non-contact speed sensor 6 measures the rubber member 2, the temperature T of the rubber member 2 is measured by the non-contact temperature sensor 7, and the computing device 9 conveys based on the measurement data of the profile sensors 4, 5, the speed sensor 6, and the temperature sensor 7. The mass M per unit time of the rubber member 2 in the state is calculated over time, and the integrated value of the mass M per unit time is calculated.

More specifically, the computing device 9 measures the mass M per unit time of the rubber member 2 by the profile sensors 4 and 5 as shown in FIG. From the measured cross-sectional area A (mm ² ) of the rubber member 2, the speed V (mm/sec) of the rubber member 2 measured by the speed sensor, and the temperature T (°C) of the rubber member 2 measured by the temperature sensor The product with the converted density ρ (g/mm ³ ) of the rubber member 2 is calculated. Then, an integrated value X is calculated by integrating the mass M (g/sec) per unit time over a predetermined period of time.

In the rubber member mass measuring method described above, the strip-shaped rubber member 2 is continuously transported along its longitudinal direction, and the non-contact profile sensor 4 is measured at the mass measuring position P1 set on the transport path of the rubber member 2. , 5 to measure the cross-sectional area A of the rubber member 2, measure the velocity V of the rubber member 2 by the non-contact velocity sensor 6 at the mass measurement position P1, and measure the velocity V of the rubber member 2 by the non-contact temperature sensor 7 at the mass measurement position P1. The temperature T of the rubber member 2 is measured, the mass M per unit time of the rubber member 2 in the conveying state is calculated over time based on the measured data, and the integrated value X of the mass M per unit time is calculated. By calculating, the mass of the strip-shaped rubber member 2 can be measured with high accuracy. Then, using the integrated value X, the cutting device 8 can cut the belt-like rubber member 2 so as to have a desired mass.

In particular, the non-contact profile sensors 4 and 5 are used to measure the cross-sectional area A of the rubber member 2, the non-contact speed sensor 6 is used to measure the speed V of the rubber member 2, and the temperature of the rubber member 2 is Since the non-contact temperature sensor 7 is used to measure T, the cross-sectional shape of the rubber member 2 to be measured is not restricted, unlike the case of relying on a contact-type sensor. degree of freedom can be increased. In addition, by using the non-contact profile sensors 4 and 5 and the non-contact speed sensor 6, it is possible to eliminate measurement errors caused by the slippage of the rubber member 2 and improve the measurement accuracy of the mass of the rubber member 2. .

When converting the density ρ of the rubber member 2 from the temperature T of the rubber member 2 measured by the temperature sensor 7 , the correlation between the temperature T and the density ρ of the rubber member 2 is input in advance to the computing device 9 . That is, since the rubber member 2 made of a specific rubber composition tends to have a lower density ρ as the temperature T rises, the density ρ can be calculated from the temperature T of the rubber member 2 by referring to the correlation. can be converted.

Here, the computing device 9 is desirably configured to correct the density ρ of the rubber member 2 using the previously obtained rubber physical property of the rubber member 2 as a correction term. That is, the reference information regarding the correlation between the temperature T and the density ρ of the rubber member 2 input to the arithmetic unit 9 is determined based on a reference sample having specific rubber physical properties (viscosity, elastic modulus, etc.). However, the rubber physical properties (viscosity, elastic modulus, etc.) of the rubber member 2 to be actually measured may fluctuate due to variations in rubber compounding and processing conditions at the time of manufacture. Therefore, the physical properties of the rubber member 2 to be measured, such as viscosity and elastic modulus, are obtained in advance, and if the physical properties of the rubber change from those of the reference sample due to variations in rubber compounding and processing conditions, By correcting the density ρ of the rubber member 2 using the rubber physical properties obtained in advance as a correction term, the measurement accuracy of the mass of the rubber member 2 can be improved. For example, when the viscosity of the rubber member 2 to be actually measured is higher than the viscosity of the reference sample, correction is performed so that the density ρ becomes smaller. Further, when the elastic modulus of the rubber member 2 to be actually measured is higher than the elastic modulus of the reference sample, correction is performed so that the density ρ becomes smaller. The physical properties of the rubber used as such a correction term are not particularly limited, and any property that affects the correlation between the temperature T and the density ρ of the rubber member 2 can be used as appropriate.

FIG. 3 shows a rubber member mass measuring apparatus according to another embodiment of the present invention. In FIG. 3, the same reference numerals are given to the same parts as in FIG. 1, and detailed description of those parts will be omitted.

As shown in FIG. 3, in the rubber member mass measuring apparatus of the present embodiment, the cross-sectional area of the rubber member 2 is measured at a correction condition measuring position P2 set upstream of the mass measuring position P1 in the transport path of the rubber member 2. Non-contact correction profile sensors 14 and 15 for measuring A', a non-contact correction speed sensor 16 for measuring the speed V' of the rubber member 2 at the correction condition measurement position P2, and the correction condition measurement position P2. is provided with a non-contact correction temperature sensor 17 for measuring the temperature T' of the rubber member 2 at. As the correction profile sensors 14 and 15, the correction speed sensor 16 and the correction temperature sensor 17, the same sensors as the profile sensors 4 and 5, the speed sensor 6 and the temperature sensor 7 can be used. It is preferable that the measuring points of the sensors 14 to 17 coincide with each other in the longitudinal direction of the rubber member 2, but they may be slightly shifted in the longitudinal direction of the rubber member 2.

The calculation device 9 corrects the mass M of the rubber member 2 per unit time using the measurement data of the correction profile sensors 14 and 15, the correction speed sensor 16, and the correction temperature sensor 17 as correction terms. That is, if the rubber member 2 shrinks during transportation, it may cause a measurement error. Therefore, at the correction condition measurement position P2 set upstream of the mass measurement position P1, the cross-sectional area A' of the rubber member 2 is measured by the correction profile sensors 14 and 15, and the non-contact correction speed sensor 16 is used. The velocity V' of the rubber member 2 is measured by the non-contact correction temperature sensor 17, and the temperature T' of the rubber member 2 is measured by the non-contact correction temperature sensor 17. Using these measured data as a correction term, the mass M By correcting , it is possible to correct the measurement error caused by the influence of expansion and contraction of the rubber member 2 in the transport path, and improve the measurement accuracy of the mass of the rubber member 2 .

For example, the computing device 9 can calculate the mass M' of the rubber member 2 per unit time at the correction condition measurement position P2 based on the formula M'=A'.times.V'.times..rho.'. If the specific portion of the rubber member 2 does not shrink at all when moving from the correction condition measurement position P2 to the mass measurement position P1, the mass M per unit time of the rubber member 2 is equal to the mass M' per unit time. match. However, if a specific portion of the rubber member 2 contracts when moving from the correction condition measurement position P2 to the mass measurement position P1, the mass M per unit time of the rubber member 2 and the mass M' per unit time There will be a mass difference ΔM between Such a tendency continues to appear even when a specific portion of the rubber member 2 moves from the mass measurement position P1 to the cutting position. Therefore, it is possible to correct the mass M of the rubber member 2 per unit time based on the difference ΔM so that the mass M″ of the rubber member 2 per unit time at the cutting position is optimized. If the distance from the position P2 to the mass measurement position P1 is equal to the distance from the mass measurement position P1 to the cutting position, M″=M+ΔM. Correction condition If the distance from the measurement position P2 to the mass measurement position P1 is different from the distance from the mass measurement position P1 to the cutting position, the influence of the mass difference ΔM may be adjusted according to the ratio of the distances.

In correcting the mass M per unit time of the rubber member 2 using the measurement data of the correction profile sensors 14 and 15, the correction speed sensor 16, and the correction temperature sensor 17 as correction terms, all of the measurement data are used as described above. You don't necessarily have to use it. For example, it is possible to obtain the difference ΔA between the cross-sectional area A of the rubber member 2 at the mass measurement position P1 and the cross-sectional area A′ of the rubber member 2 at the correction condition measurement position P2, and use this difference ΔA alone as a correction term. is. Further, it is possible to obtain the difference ΔV between the speed V of the rubber member 2 at the mass measurement position P1 and the speed V′ of the rubber member 2 at the correction condition measurement position P2, and use this difference ΔV alone as a correction term. . Furthermore, it is possible to find the difference ΔT between the temperature T of the rubber member 2 at the mass measurement position P1 and the temperature T' of the rubber member 2 at the correction condition measurement position P2, and use this difference ΔT as a correction term.

In the rubber member mass measuring method described above, in addition to being able to accurately measure the mass of the belt-shaped rubber member 2, as shown in FIG. It is possible to grasp along the axis (that is, the longitudinal direction of the rubber member 2). Therefore, for example, when a tire constituent member (e.g., tread member, side member) obtained by cutting a band-shaped rubber member is wound around the tire forming drum, the moving speed of the conveying device for the tire constituent member and the rotation of the forming drum By controlling the speed based on the longitudinal mass distribution of the tire component, it is possible to perform the winding operation in such a way that the mass distribution of the tire component is uniform around the circumference of the drum.

REFERENCE SIGNS LIST 1 extruder 2 rubber member 3 conveying device 4, 5 profile sensor 6 speed sensor 7 temperature sensor 8 cutting device 9 computing device 10 control device 14, 15 profile sensor for correction 16 speed sensor for correction 17 temperature sensor for correction

Claims (6)

A conveying device for continuously conveying a band-shaped rubber member along its longitudinal direction, and a mass measurement position set at a portion where the conveying device is interrupted in the conveying path of the rubber member so as to sandwich the rubber member from both sides. a pair of non-contact profile sensors for measuring the cross-sectional area of the rubber member, a non-contact speed sensor for measuring the speed of the rubber member at the mass measurement position, and A non-contact temperature sensor for measuring the temperature of the rubber member, and mass per unit time of the rubber member being conveyed over time based on measurement data of the profile sensor, the speed sensor, and the temperature sensor. and an arithmetic device for calculating an integrated value of the mass per unit time; A rubber member mass measuring device comprising a cutting device for cutting to a desired mass ,
The rubber member is arranged to sandwich the rubber member from both sides at a correction condition measurement position set upstream of the mass measurement position in the transport path of the rubber member and at a portion where the transport device is interrupted. A pair of non-contact correction profile sensors for measuring the cross-sectional area of the rubber member, a non-contact correction speed sensor for measuring the speed of the rubber member at the correction condition measurement position, and the rubber at the correction condition measurement position and a non-contact correction temperature sensor for measuring the temperature of the member, and the calculation device calculates the integration using the measurement data of the correction profile sensor, the correction speed sensor, and the correction temperature sensor as correction terms. A mass measuring device for a rubber member, characterized in that the mass per unit time of the rubber member used for calculation of the value is corrected . The arithmetic unit calculates the cross-sectional area A of the rubber member measured by the profile sensor, the speed V of the rubber member measured by the speed sensor, and the temperature sensor as the mass of the rubber member per unit time. 2. A mass measuring apparatus for a rubber member according to claim 1, wherein the product of the density ρ of the rubber member converted from the temperature T of the rubber member measured by . 3. The apparatus for measuring the mass of a rubber member according to claim 1, wherein the calculating device corrects the density ρ of the rubber member using a rubber physical property obtained in advance of the rubber member as a correction term. A belt-shaped rubber member is continuously conveyed along its longitudinal direction, and is arranged so as to sandwich the rubber member from both sides at a mass measurement position set at a portion where the conveying device is interrupted in the conveying path of the rubber member. The cross-sectional area of the rubber member is measured by a pair of non-contact profile sensors, the velocity of the rubber member is measured by a non-contact velocity sensor at the mass measurement position, and the non-contact velocity sensor is measured at the mass measurement position. measuring the temperature of the rubber member with a temperature sensor, calculating over time the mass per unit time of the rubber member in a conveying state based on the measurement data of the profile sensor, the speed sensor and the temperature sensor; An integrated value of mass per unit time is calculated, and the rubber member is cut to a desired mass using the integrated value by a cutting device installed downstream of the mass measurement position in the conveying path of the rubber member. A method for measuring the mass of a rubber member cut like
A pair of corrective components arranged to sandwich the rubber member from both sides at a correction condition measuring position set upstream of the mass measuring position in the conveying path of the rubber member and at a portion where the conveying device is interrupted. A cross-sectional area of the rubber member is measured by a profile sensor, a speed of the rubber member is measured by a non-contact correction speed sensor at the correction condition measurement position, and a non-contact correction temperature is measured at the correction condition measurement position. The temperature of the rubber member is measured by a sensor, and the measurement data of the profile sensor for correction, the speed sensor for correction, and the temperature sensor for correction are used as correction terms, and the integrated value is calculated as a unit of the rubber member. A method for measuring the mass of a rubber member, comprising correcting the mass per hour . As the mass of the rubber member per unit time, the cross-sectional area A of the rubber member measured by the profile sensor, the speed V of the rubber member measured by the speed sensor, and the 5. The method of measuring the mass of a rubber member according to claim 4 , wherein the product of the density ρ of the rubber member converted from the temperature T of the rubber member and the density ρ of the rubber member is calculated. 6. The method for measuring the mass of a rubber member according to claim 4 , wherein the density [rho] of the rubber member is corrected using a rubber physical property obtained in advance of the rubber member as a correction term.

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