WO2022085821A1 - Appareil d'inspection de défauts internes d'un pneu au moyen d'une technologie d'imagerie par transmission térahertz - Google Patents

Appareil d'inspection de défauts internes d'un pneu au moyen d'une technologie d'imagerie par transmission térahertz Download PDF

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Publication number
WO2022085821A1
WO2022085821A1 PCT/KR2020/014518 KR2020014518W WO2022085821A1 WO 2022085821 A1 WO2022085821 A1 WO 2022085821A1 KR 2020014518 W KR2020014518 W KR 2020014518W WO 2022085821 A1 WO2022085821 A1 WO 2022085821A1
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WIPO (PCT)
Prior art keywords
tire
support
unit
terahertz
inspection
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PCT/KR2020/014518
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English (en)
Korean (ko)
Inventor
신문식
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(주)레이텍
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Publication date
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Publication of WO2022085821A1 publication Critical patent/WO2022085821A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination

Definitions

  • the present invention relates to a tire internal defect inspection apparatus using terahertz transmission imaging technology, and more particularly, to a tire using terahertz transmission imaging technology for automatically inspecting tire defects by transmitting terahertz waves into the tire. It relates to an internal defect inspection device.
  • a tire is coupled to a wheel to form a wheel, and is mounted on a transport means such as a vehicle and used to move the transport means.
  • Tires are made using raw materials mixed with natural rubber and other chemical additives, have a dark black color as a whole, and have elasticity so that they can be deformed appropriately within the deformation limit.
  • the vehicle body can be supported.
  • Tires are largely composed of six types: tread, sidewall, carcass, belt, bead, and inner liner. It is produced by stacking in order.
  • the sidewall is the part corresponding to the side of the tire, and it is responsible for withstanding the repeated contraction and expansion during driving and protecting the carcass, the skeleton of the tire, from moisture and friction.
  • the operator checks the presence of bubbles through a contact inspection by touching the inside of the sidewall of the tire.
  • An object of the present invention to solve the above problems is to provide a tire internal defect inspection apparatus using terahertz transmission imaging technology, which can check the interlayer bonding state inside the sidewall of a tire with an image using terahertz waves. will be.
  • Another object of the present invention is to provide a tire internal defect inspection device using terahertz transmission imaging technology that automatically detects bubbles and defective adhesion parts of the produced tire, and displays the detected parts so that the operator can secondarily check them. will be.
  • Another object of the present invention is to provide a tire internal defect inspection apparatus using terahertz transmission imaging technology, in which the inspection position can be varied according to the model or standard of the tire, and the tire can be automatically drawn into and discharged from the inspection apparatus.
  • the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention comprises: a frame formed so that various members can be mounted and open at the front and rear so that the tire can be drawn in or discharged; a transfer unit formed on the front and rear surfaces of the frame, respectively, for supplying or discharging the tire into or out of the frame; A support unit for moving, a rotation unit formed on both sides of the support unit to rotate the tire by being in close contact with the outer surface of the tire, and a terra on a sidewall of the tire formed inside the frame and rotated by the rotation unit and an inspection unit for inspecting the tire by irradiating a Hertz wave.
  • the inspection unit of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention includes a transmitter positioned above and below the sidewall of the tire to irradiate terahertz waves, and is formed inside the tire and has an upper portion and a receiver for receiving the terahertz wave irradiated from the transmitter located below, and an image processor for outputting the inside of the tire as an image based on the signal received from the receiver and detecting a defective part of the tire characterized.
  • the inspection unit of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention focuses the terahertz wave irradiated from the transmitter so that the field angle becomes small, so that the terahertz wave is formed on the sidewall of the tire in the form of a line. It is irradiated and characterized in that it further comprises a lens for controlling the irradiation position of the terahertz wave through angle adjustment.
  • the inspection unit of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention is formed on the upper portion of the support unit, and when the tire is raised and lowered by the support unit, an inspection table that slides toward both inner side surfaces of the tire. It further includes, characterized in that the upper and lower surfaces of the inspection table are formed so as to receive a terahertz wave irradiated from the outside of the tire.
  • the inspection unit of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention is formed on the upper portion of the support unit, and when the tire is raised and lowered by the support unit, an inspection table that slides toward both inner side surfaces of the tire. It further includes, wherein a plurality of support rollers are formed at both ends of the inspection table to support the inner surface of the tire when the tire is rotated by the rotation unit.
  • the support unit of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention includes a support fixed to the frame and formed to support various members, and the tire positioned above the support and transported.
  • a lifting platform that supports one surface and is formed to be lifted in an upward direction, a cylinder positioned below the support to transport the elevator to the upper or lower portion by pneumatic pressure, and a lift positioned between the support and the elevator It is characterized in that it consists of a plurality of support shafts that maintain the balance of the elevator when it is lifted.
  • the rotation units of the tire internal defect inspection apparatus using the terahertz transmission imaging technology of the present invention are respectively formed on both sides of the tire so that when the tire is moved to the inspection position, it can be transported toward the outer surfaces of both sides of the tire. It characterized in that it consists of a conveyance table, and a rotating roller which is formed on the conveyance board and applies a rotational force to rotate the tire when it is in close contact with the outer surface of the tire.
  • the tire internal defect inspection apparatus using the terahertz transmission imaging technology according to the present invention the effect of automatically detecting bubbles and poor adhesion parts of the produced tire and displaying the detected parts so that the operator can check it secondarily there is.
  • the inspection position can be changed according to the model or standard of the tire, and the tire can be automatically drawn into and discharged into the inspection apparatus. It works.
  • FIG. 1 is a schematic diagram showing the configuration of a tire internal defect inspection apparatus using a terahertz transmission imaging technique according to the present invention.
  • FIG. 2 is a front view showing a state in which the tire is inserted into the tire internal defect inspection apparatus using the terahertz transmission imaging technique according to the present invention.
  • FIG 3 is a front view showing a state in which the tire internal defect inspection apparatus using the terahertz transmission imaging technique according to the present invention moves the tire to the inspection position.
  • FIG. 4 is a front view showing a state in which the tire internal defect inspection apparatus using the terahertz transmission imaging technique according to the present invention inspects the tire.
  • FIG. 5 is a front view showing a state in which an angle adjustment lens is used in the tire internal defect inspection apparatus using terahertz transmission imaging technology according to the present invention.
  • the present invention relates to a tire internal defect inspection apparatus using terahertz transmission imaging technology, and more particularly, to a tire using terahertz transmission imaging technology for automatically inspecting tire defects by transmitting terahertz waves into the tire. It relates to an internal defect inspection device.
  • FIG. 1 is a schematic diagram showing the configuration of a tire internal defect inspection apparatus using terahertz transmission imaging technology according to the present invention
  • FIG. It is a front view showing the state in which the tire is retracted
  • FIG. 3 is a front view showing the state in which the tire internal defect inspection apparatus using the terahertz transmission imaging technique according to the present invention moves the tire to the inspection position
  • FIG. 4 is a front view according to the present invention. It is a front view showing a tire inspection device for internal defects using terahertz transmission imaging technology.
  • the tire (T) internal defect inspection apparatus using terahertz transmission imaging technology is formed so that various members can be mounted, and is opened at the front and rear sides of the tire (T). ) is formed so that it can be drawn in or discharged, and the transfer unit 200 is formed on the front and rear surfaces of the frame 100, respectively, and supplies the tire T into the frame 100 or discharges it to the outside. And, a support unit 300 formed inside the frame 100 to support the tire T transported by the transport device and move it to the inspection position, and the tire T formed on both sides of the support unit 300 .
  • the frame 100 is used to prepare a space so that each unit can be mounted using a plurality of profiles, and on the front side, the tire T transported by the transport unit 200 flows into the frame 100 .
  • the tire T is opened at the rear so that the inspected tire T can be discharged to the outside of the frame 100 .
  • a display 600 is formed on the side of the frame 100 to check the information of the supplied tire T, inspection history, inspection result, and defective detection position, and through the display 600, an operator can check the tire to be inspected. It becomes possible to set the standard of (T) and control the operation of each unit.
  • the transfer unit 200 is formed on the front and rear surfaces of the frame 100, respectively, and is connected from a manufacturing facility or a supply unit to sequentially transfer the manufactured tire T into the frame 100. Upon completion, the tire T is discharged to the outside of the frame 100 .
  • the transfer unit 200 is preferably also formed inside the frame 100, and more specifically, formed as a conveyor belt formed on both sides of the support unit 300 to support the lower portions of both sides of the tire T and to be transported. It is preferable that, through this, when the support unit 300 is raised and lowered, only the tire T is supported to be raised and lowered.
  • the width of the support unit 300 is formed to be smaller than the width of the transfer unit 200, so that the lower part of the tire T is supported when it is raised and lowered, and when lowered, the lower portions of both sides of the tire T are supported by the conveyor belt. It is desirable to be able to discharge to the outside.
  • the support unit 300 includes a support 340 fixed to the frame 100 to support various members, and a support 340 positioned above the support 340 to support one surface of the transported tire T and upper
  • the elevator 310 is formed so as to be raised and lowered in the direction; It is characterized in that it is positioned between the 310) and consists of a plurality of support shafts 330 that maintain the balance of the elevator 310 when the elevator 310 is lifted.
  • the lifting platform 310 is formed to support the lower surface of the tire T, and is used to align the tire T and elevate it to the inspection position where the inspection unit 500 is formed.
  • a support 340 fixed to the frame 100 is formed at the lower portion of the lift 310, and a cylinder 320 is formed on the lower surface of the support 340, The piston rod of the cylinder 320 is coupled to the lower surface so that the lifting platform 310 can be raised or lowered by protrusion or insertion in the operation of the piston rod.
  • a plurality of support shafts 330 are formed on the lower edge of the elevator 310 to prevent eccentricity from occurring while the elevator 310 is raised and lowered, and the support shaft 330 penetrates the support 340 to prevent eccentricity from occurring. It is formed to move vertically in the direction so that the elevator 310 can be maintained in a horizontal state in parallel.
  • a rotating plate coupled to the shaft so as to rotate freely from the elevator 310 is formed, and when the rotation unit 400 rotates the tire T by 360 degrees, friction is not generated by the rotating plate. It is desirable to allow the tire T to rotate freely.
  • the rotation unit 400 is closely attached to both outer surfaces of the tire T and rotates the tire T by 360 degrees. Used to inspect the entire sidewall.
  • the rotation unit 400 is formed on both sides of the tire T, and when the tire T is moved to the inspection position, the transport table 410 is formed so as to be transported toward the outer surfaces of both sides of the tire T; It is formed on the transport table 410 and is characterized in that it comprises a rotating roller 420 that applies a rotational force to rotate the tire T when it is in close contact with the outer surface of the tire T.
  • Carriers 410 are respectively formed on both sides of the inspection position where the tire T is inspected, and when the tire T is lifted by the support unit 300, the tire T is in close contact with the outer surface of the tire T. is formed to move toward the center of
  • a ball screw and an LM guide are formed on the upper portion of the frame 100 to support the elevator 310 and simultaneously move the elevator 310 in the direction of the center of the tire T by external power.
  • the rotary roller 420 formed on the carriage 410 can be in close contact with the outer surface of the tire T, and the rotary roller 420 by external power ) is rotated, the tire T is rotated in a 360 degree direction from the upper surface of the support unit 300 .
  • the rotating roller 420 may be formed to rotate freely.
  • a separate rotating motor for rotating the rotating plate of the support unit 300 is provided so that the tire T can be rotated 360 degrees. .
  • the inspection unit 500 is used to read bubbles or adhesion failure inside the tire T by irradiating terahertz waves to the upper and lower portions of the sidewall of the tire T, respectively.
  • the inspection unit 500 includes a transmitter 510 positioned on the upper and lower portions of the sidewall of the tire T to irradiate terahertz waves, and a transmitter 510 formed inside the tire T and positioned on the upper and lower portions (
  • a receiver 520 that receives the terahertz wave irradiated from 510 and an image of outputting the inside of the tire T as an image based on the signal received from the receiver 520 and detecting a defective part of the tire T It is characterized in that it consists of a processor (530).
  • the inspection unit 500 is formed on the upper portion of the support unit 300, and when the tire T is raised and lowered by the support unit 300, it further includes an inspection table 560 that slides toward both inner side surfaces of the tire T. , it is characterized in that the upper and lower surfaces of the inspection table 560 are formed so as to receive the terahertz wave irradiated from the outside of the tire (T).
  • the transmitter 510 is a device for generating terahertz waves, and terahertz waves refers to electromagnetic waves in the terahertz region, and may preferably have a frequency of 0.1 THz to 10 THz.
  • a region that does not significantly deviate from this range can be recognized as a terahertz wave in the present invention, and the transmitter 510 can be designed in various forms to generate and supply terahertz waves.
  • the transmitter 510 may be implemented using a Gunn diode, and the Gunn diode is a diode that oscillates electromagnetic waves using the gunn effect, and has the advantage of being inexpensive and capable of minimizing the volume.
  • the transmitter 510 of the present invention may generate a terahertz wave using such a Gunn diode.
  • the terahertz wave generated by the Gunn diode may be radiated through a horn, but the present invention must use such a Gunn diode. It is not limited.
  • the transmitter 510 is positioned at the upper portion of one side and the lower portion of the other side of the tire T supported by the support unit 300 to irradiate the terahertz wave into the sidewall of the tire T.
  • the transmitter 510 may be positioned at the upper and lower sides of one side to radiate terahertz waves. It is preferable to irradiate the wave.
  • the transmitter 510 is preferably formed to be movable in the horizontal direction together with the transport table 410 of the rotation unit 400, and through this, irradiating terahertz waves according to the standard or model of the tire T. It is desirable to be able to change the position.
  • the transmitter 510 when the transmitter 510 is interlocked with the transporter 410 and the position is transferred, the transmitter 510 is transported to a position where the transporter 410 is in close contact with the outer surface of the tire T according to the standard of the tire T. ) can be transferred to a position close to the sidewall of the tire T.
  • the transmitter 510 can adjust the position in the horizontal and vertical directions as needed, so that the position at which the terahertz wave is irradiated can be finely adjusted according to the tire (T) standard or model.
  • Two inspection tables 560 are formed on the lower surface of the fixed shaft 550 to be crossed with each other and can be slid toward both sides inside the tire T, and the surface is irradiated from the transmitter 510 and then the tire ( A receiver 520 for receiving the terahertz wave transmitted through T) is formed.
  • the inspection table 560 When the tire T is raised and lowered by the support unit 300 , the inspection table 560 is moved toward the center point of the fixed shaft 550 to prevent the fixing table from interfering with the outer surface of the tire T, and the tire T ) is fully lifted and reached the inspection position, the two inspection tables 560 slide to one side and the other side toward the inside of the tire T, respectively.
  • the receiver 520 formed on the surface of the examination table 560 is formed close to the portion where the transmitter 510 is located.
  • the receiver 520 should be formed on the upper surface of the 560 and the detector 520 sliding to the other side is irradiated from the lower side, so it is preferable that the receiver 520 is formed on the lower surface of the inspection table 560 . .
  • the receiver 520 is always located in a portion close to the sidewall to receive the terahertz wave passing through the sidewall, and as the terahertz wave is transmitted, it is inside the sidewall of the tire T. Bubbles, voids, foreign substances, and poor adhesion can be detected.
  • the inspection unit 500 irradiates terahertz waves in a state in which the tire T is rotated in a 360 degree direction by the rotation unit 400, the entire sidewall of the tire T can be inspected.
  • the image processor 530 is formed inside the frame 100 and is connected to the examination table 560 so that it can be displayed as a two-dimensional image on the display 600 based on the signal received from the receiver 520 .
  • the image processor 530 has a built-in circuit for removing noise and amplifying a signal, and displays an image of a position where the terahertz wave is currently irradiated as a two-dimensional image through software that analyzes the received terahertz wave (600). ) can be printed.
  • the image processor 530 detects if an image similar to a preset size, shape, foreign material, void, or bubble is formed, and outputs it to the display 600 , and the operator secondarily reports the defective part. You will be able to mark the location so that you can check it.
  • a separate marking machine 700 is formed inside the frame 100 , and the portion detected by the image processor 530 can be displayed on the outer surface of the tire T, through which the operator is discharged from the frame 100 . By secondly inspecting the tire T, it is possible to finally determine whether the tire is good or defective.
  • the tire T is rotated 360 degrees and the tire T is automatically inspected and the defective position can be marked at the same time, so that the quality inspection is possible more quickly.
  • a plurality of support rollers are formed at both ends of the inspection table 560 to support the inner surface of the tire T when the tire T is rotated by the rotation unit 400 .
  • the inspection table 560 slides toward both inner side surfaces of the tire T when the tire T is raised and lowered by the support unit 300 . At this time, a plurality of support rollers (not shown) are formed at both ends of the inspection table 560 . It is formed so that it can rotate freely in contact with the inner surface of the tire (T).
  • the support roller can come into contact with the inner surface of the tire T by sliding of the inspection table 560, and when the tire T is rotated 360 degrees by the rotation units 400 formed on both outer surfaces of the tire T It is used to support the inner surface of the tire T so that the tire T can be rotated in a circular state.
  • the support rollers are respectively in contact with and support the inner side surfaces of the tire (T), the rotating rollers 420 come into contact with the outer side surfaces of the tire (T), respectively, and the supporting rollers and the rotating rollers 420 are located close to each other. It is preferable that it is formed.
  • the tire T rotated by 360 degrees by the rotation unit 400 can be rotated in the correct position without changing its position or shape, and Since the terahertz wave irradiated from the transmitter 510 is irradiated to the sidewall of the tire T rotated at a predetermined position, the terahertz wave irradiated position can be uniformly maintained.
  • the internal state of the sidewall of the tire T can be checked as an image, and the inspected tire T is lowered by the support unit 300 and then the frame ( 100) can be discharged to the rear side.
  • FIG 5 is a front view showing a state in which a lens 540 is used in the tire internal defect inspection apparatus using terahertz transmission imaging technology according to the present invention.
  • the inspection unit 500 focuses the terahertz wave irradiated from the transmitter 510 so that the field angle is small so that the terahertz wave is irradiated to the sidewall of the tire T in the form of a line. , characterized in that it further comprises a lens 540 for controlling the irradiation position of the terahertz wave through angle adjustment.
  • the lens 540 is used to irradiate the cylindrical terahertz wave irradiated from the transmitter 510 as a line-shaped beam, and a lens ( 540 is formed, and transmitters 510 are respectively formed in the horizontal direction of the lens 540 to irradiate terahertz waves to the lens 540 .
  • the lens 540 can adjust the angle so that the position at which the terahertz wave irradiated from the transmitter 510 is irradiated to the tire T can be adjusted. It becomes possible to precisely control the position where the wave is irradiated.
  • the lens 540 is coupled to the transport table 410 together with the transmitter 510 and moved in the horizontal direction so that the position is changed according to the size or model of the tire T so that the sidewall can be irradiated with terahertz waves.
  • the lens 540 is preferably formed so that it can be finely adjusted in the horizontal and vertical directions independently of the transmitter 510 .
  • the bonding state between the layers inside the sidewall of the tire can be checked with an image using terahertz waves, and the produced tire Automatically detects the bubble and defective adhesion parts of the engine and marks the detected parts so that the operator can check them secondarily.
  • the inspection position can be changed according to the model or standard of the tire, and the tire is automatically drawn into the inspection device and It has the effect of allowing it to be released.

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Abstract

La présente invention concerne un appareil d'inspection des défauts internes d'un pneu au moyen d'une technologie d'imagerie par transmission térahertz, comprenant : un bâti, formé pour permettre le montage de divers types d'éléments sur ce dernier et dont une surface avant et une surface arrière sont formées pour être ouvertes pour pouvoir insérer le pneu à l'intérieur de ce dernier ou l'en extraire ; une unité de transfert, formée sur chacune de la surface avant et de la surface arrière du bâti et qui introduit le pneu à l'intérieur du bâti ou qui l'en extrait vers l'extérieur ; une unité de soutien, formée à l'intérieur du bâti, qui soutient le pneu transféré grâce à l'unité de transfert et qui déplace le pneu en position d'inspection ; une unité rotative, formée de part et d'autre de l'unité de soutien et en contact étroit avec la surface extérieure du pneu pour faire tourner le pneu ; et une unité d'inspection, formée à l'intérieur du bâti et émettant une onde térahertz au niveau d'une paroi latérale du pneu tournant grâce à l'unité rotative, afin d'inspecter le pneu.
PCT/KR2020/014518 2020-10-22 2020-10-22 Appareil d'inspection de défauts internes d'un pneu au moyen d'une technologie d'imagerie par transmission térahertz WO2022085821A1 (fr)

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Application Number Priority Date Filing Date Title
KR1020200137238A KR102388751B1 (ko) 2020-10-22 2020-10-22 테라헤르츠 투과 영상기술을 이용한 타이어 내부 결함 검사장치
KR10-2020-0137238 2020-10-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11874223B1 (en) 2022-08-30 2024-01-16 The Goodyear Tire & Rubber Company Terahertz characterization of a multi-layered tire tread

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Publication number Priority date Publication date Assignee Title
JP2006153789A (ja) * 2004-12-01 2006-06-15 Institute Of Physical & Chemical Research タイヤの検査装置とタイヤの検査方法
KR20100128531A (ko) * 2009-05-28 2010-12-08 조선대학교산학협력단 타이어 결함검출 측정시간 단축을 위한 장치
KR101299571B1 (ko) * 2012-07-06 2013-08-23 세반코주식회사 타이어 검사방법
JP2016041577A (ja) * 2014-08-13 2016-03-31 ステインビッヒラー オプトテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング タイヤの検査方法および装置
JP2018119928A (ja) * 2017-01-27 2018-08-02 株式会社ブリヂストン タイヤ接地特性の評価方法

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Publication number Priority date Publication date Assignee Title
MX2017007772A (es) 2014-12-22 2017-10-02 Pirelli Metodo y aparato para revisar llantas en una linea de produccion.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006153789A (ja) * 2004-12-01 2006-06-15 Institute Of Physical & Chemical Research タイヤの検査装置とタイヤの検査方法
KR20100128531A (ko) * 2009-05-28 2010-12-08 조선대학교산학협력단 타이어 결함검출 측정시간 단축을 위한 장치
KR101299571B1 (ko) * 2012-07-06 2013-08-23 세반코주식회사 타이어 검사방법
JP2016041577A (ja) * 2014-08-13 2016-03-31 ステインビッヒラー オプトテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング タイヤの検査方法および装置
JP2018119928A (ja) * 2017-01-27 2018-08-02 株式会社ブリヂストン タイヤ接地特性の評価方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11874223B1 (en) 2022-08-30 2024-01-16 The Goodyear Tire & Rubber Company Terahertz characterization of a multi-layered tire tread

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