WO2020030082A1 - Système de réduction de charge statique utilisant de l'air humide - Google Patents

Système de réduction de charge statique utilisant de l'air humide Download PDF

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Publication number
WO2020030082A1
WO2020030082A1 PCT/CN2019/099920 CN2019099920W WO2020030082A1 WO 2020030082 A1 WO2020030082 A1 WO 2020030082A1 CN 2019099920 W CN2019099920 W CN 2019099920W WO 2020030082 A1 WO2020030082 A1 WO 2020030082A1
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WO
WIPO (PCT)
Prior art keywords
roller
static charge
static
charge reduction
humid air
Prior art date
Application number
PCT/CN2019/099920
Other languages
English (en)
Inventor
Kek Hing Kow
Original Assignee
Esd Technology Consulting & Licensing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esd Technology Consulting & Licensing Co., Ltd. filed Critical Esd Technology Consulting & Licensing Co., Ltd.
Priority to CN201980051498.5A priority Critical patent/CN112544123B/zh
Publication of WO2020030082A1 publication Critical patent/WO2020030082A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges

Definitions

  • the present invention relates to static charge reduction technique, and more specific, to a static charge reduction system using humid air.
  • a static charge reduction system using humid air comprising a conductor connecting a low voltage source, a static charge reduction component having at least a first surface, and a humid air supplier continuously supplying humid air with an RH higher than 60% to the first surface of the static charge reduction component and/or a discharging surface of a static latent object that is lurking with high static charge , wherein by momentarily contacting and separating the first surface of the static charge reduction component to the discharging surface of the static latent object , the static charge on the static latent object drops drastically to at least less than a half.
  • the first surface of the static charge reduction component and/or the discharging surface of the static latent object are soaked with humid air with an RH in a range of 70%-99%, and the static charge on the static latent object drops drastically to less than at least one-tenth to zero.
  • the humid air supplier comprises a humid air generator and an incoming tube for delivering the humid air generated by the humid air generator to the static charge reduction component.
  • the first surface of the static charge reduction component is an airy netting where humid air travels in and out of the airy netting easily through its non-obstructive air flow path.
  • the static charge reduction component comprises a roller arranged in a first direction
  • the static latent object is a flexible static latent object moving in a second direction which is different from the first direction, such that when a first surface of the roller momentarily contacts with and then separates from a discharging surface of the flexible static latent object, the first surface of the roller and the discharging surface of the flexible static latent object are moved in a same direction.
  • the roller comprises at least one first roller having a roller body with a cylindrical surface and a roller rod connecting the conductor, wherein a discharging surface of the flexible static latent object momentarily contacts with and then separates from the cylindrical surface of the roller body.
  • one first roller is provided, the first roller rotates in an anti-clockwise direction and the flexible static latent object rotates in the same anti-clockwise direction to pass through the first roller.
  • each roller body rotates about its roller rod, the flexible static latent object is moved to pass through the first rollers such that a discharging surface of the flexible static latent object momentarily contacts with and then separates from the cylindrical surface of the roller body of at least one of the first rollers.
  • the incoming tube comprising at least two branch tubes for delivering the humid air generated by the humid air generator to at least two of the first rollers is provided.
  • the roller comprises at least one second roller having a rod shaft electrically connected to the conductor and a roller surface surrounding the rod shaft, the flexible static latent object is moved in a horizontal direction and the rod shaft is arranged above the flexible static latent object such that the roller surface of the second roller momentarily contacts with and then separates from a discharging surface of the flexible static latent object.
  • the rod shaft is arranged in the horizontal direction and the roller surface is rotatable about the rod shaft.
  • the incoming tube is arranged in parallel to the second roller and the incoming tube has multiple holes on a surface facing the roller surface for directing the humid air.
  • the roller comprises a dispenser formed by a plate provided with multiple dispensing rods arranged relatively rotated with each other, wherein a discharging surface of the flexible static latent object momentarily contacts with and then separates from an outer surface of at least one of the multiple dispensing rods.
  • the multiple dispensing rods are arranged on the plate in a circular pattern and the plate is affixed with a side wall cover around its edge to form an enclosure with an opening through which the flexible static latent object is rolled into the dispenser and passed through the multiple dispensing rods.
  • the plate is affixed with a core rod at its middle, the flexible static latent object is rolled into and passed through the multiple dispensing rods and finally convolved on the core rod or rolled out of the dispenser at the opening of the enclosure.
  • the incoming tube comprising at least two branch tubes for delivering the humid air generated by a humid air generator to the dispenser, wherein the two branch tubes are arranged close to the opening with one branch tube above the flexible static latent object and one branch below the flexible static latent object.
  • the static charge reduction component is an adhesive film removal mechanical mechanism comprising at least two side structures each having one slot facing each other, a pair of slidable and rotatable rods hold in two slots to allow free and easy sliding movement of the slidable and rotatable rods, the flexible static latent object is inserted into a gap between the slidable and rotatable rods such that a discharging surface of the flexible static latent object momentarily contacts with and then separates from outer surfaces of the slidable and rotatable rods.
  • the slidable and rotatable rods are electrically connected to at least one of the two side structures which are further electrically connected to the conductor.
  • the incoming tube comprising at least two branch tubes for delivering the humid air generated by a humid air generator to the adhesive film removal mechanical mechanism, wherein the two branch tubes is arranged at opposite sides of the slidable and rotatable rods.
  • the static charge reduction component comprises at least a first roller and a second roller intervally arranged in a first direction and a roller holder for holding the first roller, the second roller and the incoming tube, wherein the incoming tube is arranged above the static latent object.
  • the roller holder has a triangle shape and is moveable along the second direction, the first roller and the second roller are arranged in parallel at a lower part of the triangle shape and at least one incoming tube is arranged at an upper part of the triangle shape.
  • the roller holder has a rectangle shape and is moveable along the second direction, the first roller and the second roller are arranged in parallel at a lower part of the rectangle shape and more than two incoming tubes are arranged in parallel at an upper part of the rectangle shape.
  • the humid air supplier comprises a humid air generator, a hollow compartment structure constructed from an outer wall and an inner wall with perforated air holes spread all over the inner wall, and a humid air delivery element for delivering the humid air generated by the humid air generator to the hollow compartment structure; wherein the static charge reduction component comprises a roller placed along a centre axis of the hollow compartment structure.
  • the roller is wrapped with a static dissipative or conductive layer of flexible foam sheet or a static dissipative or conductive layer of protruding stubs.
  • the conductor having an electrical resistance of less than 10e7ohm is grounded or connected in series to the low voltage source.
  • the static latent object is a polymeric or insulative film, block, sheet, tape or web
  • the static charge reduction component is made of plastic, metal, wood, rubber, or any combination of these materials.
  • FIG. 1 is a diagram showing a static charge reduction system according to a first embodiment of the present application.
  • Fig.2A is a diagram showing putting a first surface of the static charge reduction component of the static charge reduction system to a discharging surface of a static latent object.
  • Fig.2B is a diagram showing contacting the first surface of the static charge reduction component and the discharging surface of the static latent object.
  • Fig.2C is a diagram showing separating the first surface of the static charge reduction component and the discharging surface of the static latent object.
  • Fig. 3 is a diagram showing a static charge reduction system according to a second embodiment of the present application.
  • Fig. 4 is a diagram showing a static charge reduction system according to a third embodiment of the present application.
  • Fig. 5A is a diagram showing a first transformation of the static charge reduction system according to a third embodiment of the present application.
  • Fig. 5B is a diagram showing a second transformation of the static charge reduction system according to a third embodiment of the present application.
  • Fig. 5C is a diagram showing a third transformation of the static charge reduction system according to a third embodiment of the present application.
  • Fig. 5D is a diagram showing a fourth transformation of the static charge reduction system according to a third embodiment of the present application.
  • Fig. 5E is a diagram showing a fifth transformation of the static charge reduction system according to a third embodiment of the present application.
  • Fig. 6 is a diagram showing a static charge reduction system according to a fourth embodiment of the present application.
  • Fig. 7A is a diagram showing a static charge reduction system according to a fifth embodiment of the present application.
  • Fig.7B is a diagram showing the inner parts of the static charge reduction component of the static charge reduction system according to the fifth embodiment of the present application.
  • Fig.7C is a diagram showing the out enclosure of the static charge reduction component of the static charge reduction system according to the fifth embodiment of the present application.
  • Fig.7D is a diagram showing a first transformation of the static charge reduction system according to a fifth embodiment of the present application.
  • Fig. 8 is a diagram showing a static charge reduction system according to a sixth embodiment of the present application.
  • Figs.9A-9D are diagrams showing further transformations of the static charge reduction system according to a seventh embodiment of the present application.
  • Figs.10 is diagrams showing another transformation of the static charge reduction system according to an eighth embodiment of the present application.
  • Figs.11A-11B are diagrams showing preferred embodiments of the rollers.
  • Fig.12 has shown a table 1 which discloses remaining static charges after the contact and separation of the first surface of the static charge reduction component and the static charge on the static latent object.
  • Fig. 1 is a diagram showing a static charge reduction system according to a first embodiment of the present application.
  • Figs.2A-2C have shown the contact and separation of the static charge reduction component and the static latent object.
  • the static charge reduction system comprises a conductor 20 connecting a low voltage source 40, a static charge reduction component 10 electrically connected to the conductor 20, and a humid air supplier 70 continuously supplying humid air with an RH higher than 60%.
  • the conductor 20 can have an electrical resistance of less than 10e7ohm.
  • the conductor 20 can be grounded or connected to the low voltage source 40 of 1.5V, 3V, 6V, 12V and 24V. It should be noted that, the listed or tested low voltage source 40 is just for example, one skilled in the art knows that any voltage source lower than the voltage of the static latent object 30 is allowable.
  • the static charge reduction system can be applicable to a static latent object 30 that is lurking with high static charges 32.
  • the static latent object 30 can be objects with large insulative surface areas or materials of high purity or highly insulative nature like polymeric films, sheets or wide webs.
  • a first surface11 of the static charge reduction component 10 and a discharging surface 31 of the static latent object 30 are contacted with each other, and then momentarily separated immediately, such as after 1-2 seconds, or at most after 5 seconds.
  • the humid air supplier 70 continuously supplies the humid air with an RH higher than 60%, preferably in a range of 70%-99% to the discharging surface 31 of the static latent object 30 or the first surface11 of the static charge reduction component 10.
  • the humid air supplier 70 continuously supplies the humid air in a range of 70%-99% to the contact points of both the discharging surface 31 and the first surface 11.
  • the humid air supplier 70 continuously supplies the humid air in a range of 70%-99% to some other point of the discharging surface 31 or the first surface 11 only, and such that the discharging surface 31 and/or the first surface 11 can be soaked with the humid air.
  • the static charge on the static latent object 30 drops drastically to less than a half.
  • the static charge on the static latent object 30 drops drastically to less than a fraction of the original high static charge level, such as less than one-tenth. It dependents on the contact time, duration time and the RH of the humid air and so on.
  • Fig.12 has shown a table 1 which discloses remaining static charges after the contact and separation of the first surface 11 of the static charge reduction component 10 and the static charge on the static latent object 30. Different voltages of low voltage source 40 are tested and similar result is obtained for the same RH and same contact time.
  • the inventor does not know why such a surprising and dramatic reduction of the static charge in high relative humidity of above 60%RH compared to normal dry ambient environment of 40%RH to 50%RH which does not yield any visible significant static charge reduction under such standard production environment.
  • Fig. 3 is a diagram showing a static charge reduction system according to a second embodiment of the present application.
  • the static charge reduction system comprises an electrically grounded conductor 21, a static charge reduction component 10 electrically connected to the conductor 21, and a humid air supplier continuously supplying humid air with an RH higher than 60%.
  • the humid air supplier continuously supplies humid air with an RH (Relative Humidity) in a range of 70%-99%.
  • the conductor 20 can have an electrical resistance of less than 10e7ohm.
  • the conductor 20 can be grounded or connected to the low voltage source 40 of 1.5V, 3V, 6V, 12V and 24V.
  • the static charge reduction system can be applicable to a static latent object 30 that is lurking with high static charges 32.
  • the static latent object 30 is a rectangular block full of static charges, and the static charge reduction component 10 has a similar structure of the static latent object 30, but a slightly bigger size is more preferred.
  • the static charge reduction component 10 and the static latent object 30 can have other size or structure.
  • the static charge reduction component 10 and the static latent object 30 also can have other structure, such as a square, hemisphere or other structure as if there are contacting surfaces between each other.
  • the humid air supplier continuously supplies humid air with an RH higher than 60% to the contact point of the first surface 11 of the static charge reduction component 10 and the discharging surface (not shown) of the static latent object 30.
  • the humid air supplier continuously supplies the humid air in a range of 70%-99% to some other point of the discharging surface 31 or the first surface 11 only, and such that the discharging surface 31 and/or the first surface 11 can be soaked with the humid air.
  • the static charge on the static latent object 30 drops drastically to less than a half.
  • the static charge on the static latent object 30 drops drastically to less than a fraction of the original high static charge level, such as less than one-tenth. It dependents on the contact time and the RH of the humid air, and so on.
  • the humid air supplier comprises a humid air generator 50 and an incoming tube 60 for delivering humid air with high relative humidity generated by the humid air generator 50 to the static charge reduction component 10.
  • the incoming tube 60 is arranged along the longitudinal direction of the static charge reduction component 10, and provided multiple holes 61 for directing the humid air to the static charge reduction component 10.
  • the humid air generator 50 can be a humidifier, a humid air jet, a water vapour evaporation from wet surface coating, from capillary action, from dipping, from printing, from heated water or any other method commonly known in the industry.
  • the first surface 11 of the static charge reduction component 10 can have an airy netting where humid air travels in and out of the airy netting easily through its non-obstructive air flow path.
  • the electrically grounded static charge reduction component that soaked with column of humid air has created a new and economical way to mitigate static charge on insulative material without the use of an air ionizer.
  • Fig. 4 is a diagram showing a static charge reduction system according to a third embodiment of the present application.
  • the static charge reduction system comprises a conductor which is grounded, a static charge reduction component electrically connected to the conductor, and a humid air supplier continuously supplying humid air with an RH higher than 60%.
  • the humid air supplier continuously supplies humid air with an RH (Relative Humidity) in a range of 70%-99%.
  • the conductor can be a grounded wire 200 having an electrical resistance of less than 10e7ohm.
  • the static charge reduction component can be a first roller 100 rotating in a first direction, such as in an anti-clockwise direction or a clockwise direction.
  • the first roller 100 can have a roller body 102 having a cylindrical surface 101 and a roller rod 103 arranged in the core centre of the roller body 102 as a rotating shaft.
  • the static latent object can be an insulative film 300 rotating freely in the same direction such as in an anti-clockwise direction or a clockwise direction.
  • the humid air supplier continuously supplies humid air with an RH higher than 60% to the contact point of the discharging surface 301 of the insulative film 300 and the cylindrical surface 101 of the roller body 102.
  • the humid air supplier continuously supplies the humid air in a range of 70%-99% to some other point of the discharging surface 301 or the cylindrical surface 101only, and such that the discharging surface 301 and the cylindrical surface 101can be soaked with the humid air.
  • the discharging surface 301 of the insulative film 300 momentarily contacts with and then separates from the cylindrical surface 101 of the roller body 102.
  • the high static charge on the discharging surface 301 of the insulative film 300 is surprisingly reduced to an unexpected very low level, such as less one-tenth of the initial static charge level.
  • the insulative film 300 and the roller can arranged in other directions as if when the discharging surface 301 of the insulative film 300momentarily contacts with and then separates from the cylindrical surface 101 of the roller body 102, the discharging surface 301 of the insulative film 300 and the cylindrical surface 101 of the roller body 102 are moved in a same direction.
  • the insulative film 300 can be moved in the horizontal direction and the roller rod 103 is arranged in the core centre of the roller body 102, and the roller body 102 rotates about the roller rod 103, such as in an anti-clockwise direction or in clockwise direction.
  • the roller rod 103 and the roller body 102 can be formed in one-piece. In other preferred embodiments, there can be more than one first rollers 110, and these embodiments would be discussed later.
  • the cylindrical surface 101 of the roller body 102 can be made of plastic, metal, wood, rubber, or any combination of these materials.
  • the cylindrical surface 101 of the roller body 102 can be an airy netting where humid air travels in and out of the airy netting easily through its non-obstructive air flow path.
  • the humid air supplier comprises a humid air generator 500 and an incoming tube 600 for delivering humid air with high relative humidity generated by the humid air generator 500 to the first roller 100.
  • the incoming tube 600 is arranged along an axis direction of the first roller and provided multiple holes 601 for directing the humid air to the cylindrical surface 101 of the roller body102.
  • the humid air generator 500 can be a humidifier, a humid air jet, a water vapour evaporation from wet surface coating, from capillary action, from dipping, from printing, from heated water or any other method commonly known in the industry.
  • the insulative film 300 can be replaced by any other flexible material, such as tapes or plates, or webs.
  • Figs. 5A-5D are diagrams showing the transformations of the static charge reduction system according to the third embodiment of the present application which is capable of adapting different insulative film in and out orientation to achieve various film traveling patterns in offering more flexibility in the usage condition of the present application.
  • the two first roller 100 electrically connected with a grounded conductor are arranged next to each other in the longitudinal direction.
  • the two first rollers100 can be constructed according to any one of the embodiments discussed in Fig.4.
  • the incoming tube 620 connecting to the humid air generator 500 is specifically constructed.
  • the incoming tube 620 has one main tube connecting the humid air generator 500 and two branch tubes 621 and 624 which are parallel to the axis of the two first rollers100, respectively.
  • the insulative film 300 travels in the horizontal direction at first to contact with and then momentarily separate from a cylindrical surface of the first roller 100 arranged at the bottom with a discharge surface.
  • the insulative film 300 rotates upward with the first roller 100 arranged at the bottom to be passed to the first roller 100 arranged at the top. After that, the insulative film 300 momentarily contacts with and then separates from a cylindrical surface of the first roller 100 arranged at the top with the discharge surface. After that, the insulative film 300 is passed through the first roller 100 arranged at the top and travels in the horizontal direction again.
  • the branch tubes 621 and 624 are arranged at opposite sides of the two first rollers 100 and further provided with multiple holes 622 and 623 at the surfaces facing the cylindrical surfaces of the two first rollers for directing humid air to them.
  • the multiple holes can be replaced by a long slit of thin air gap.
  • the two first rollers 100 can be arranged next to each other in the horizontal direction.
  • the incoming tube 620 can be positioned in the horizontal direction or the longitudinal direction for directing humid air to the cylindrical surface of the two first rollers which contact with and then momentarily separate from the discharging surface of the insulative film 300.
  • the two rollers 100 can be arranged in next to each other in other directions, such as an angle relative to the longitudinal direction, as shown in Fig.5B.
  • the incoming tube 620 can be positioned in a corresponding angle respectively.
  • Fig.5C has shown another transformation in which four first rollers 100 are provided.
  • the four first rollers 100 are arranged in parallel in the horizontal direction. Similar as that discussed above, the insulative film 300 is moved in the horizontal direction to pass through the four rollers 100 to contact with and then momentarily separate from the cylindrical surface of each of the first roller 100 via its discharging surface.
  • the incoming tube 620 has one main tube connecting the humid air generator 500 and two branch tubes with multiple holes for directing humid air to the cylindrical surface of any two of the first rollers 100.
  • the incoming tube 620 may have more or less branch tubes with multiple holes for directing humid air to the cylindrical surface of the first rollers 100.
  • Figs.5D and 5E have shown further transformations in which four first rollers 100 are provided.
  • the four first rollers 100 are arranged in two groups in parallel with each other in the horizontal direction. In each group, two first rollers 100 are arranged in parallel with each other in the longitudinal direction.
  • the insulative film 300 is moved in the horizontal direction to pass through the four first rollers 100.
  • the incoming tube 620 has one main tube connecting the humid air generator 500 and two branch tubes with multiple holes for directing humid air to the cylindrical surface of any two of the first rollers 100.
  • the incoming tube 620 may have more or less branch tubes with multiple holes for directing humid air to the cylindrical surface of the first rollers 100.
  • the branch tubes are be adjusted to any position for directing humid air to the cylindrical surface.
  • the four first rollers 100 are arranged in two groups in parallel with each other in the horizontal direction.
  • three first rollers 100 are arranged in parallel with each other in the longitudinal direction.
  • the other one first roller 100 is arranged in parallel with the lowest one of the three first rollers.
  • the other first roller 100 also can be arranged in parallel with the top one of the three first rollers.
  • the insulative film 300 is moved in the horizontal direction at first and then in the longitudinal direction to pass through the four first rollers 100.
  • first rollers can be arranged in different ways, as if the insulative film 300 can be moved to contact with and then momentarily separate from at least one cylindrical surface of at least one of the first roller 100 via its discharge surface.
  • the insulative film 300 can be moved to contact with and then momentarily separate from each cylindrical surface of all first roller 100 via its discharge surface.
  • the incoming tube 620 has one main tube connecting the humid air generator 500 and two branch tubes with multiple holes for directing humid air to the cylindrical surface of any two of the first rollers 100.
  • the two branch tubes are arranged at opposite sides of one first roller.
  • the incoming tube 620 may have more or less branch tubes with multiple holes for directing humid air to the cylindrical surface of the first rollers 100.
  • Fig. 6 is a diagram showing a static charge reduction system according to a fourth embodiment of the present application.
  • the static charge reduction system comprises a conductor which is grounded, a static charge reduction component electrically connected to the conductor, and a humid air supplier continuously supplying humid air with an RH higher than 60%.
  • the humid air supplier continuously supplies humid air with an RH (Relative Humidity) in a range of 70%-99%.
  • the conductor can be a grounded wire 200 having an electrical resistance of less than 10e7ohm.
  • the static charge reduction component can be a second roller 110 comprising a rod shaft 112 electrically connected to the grounded wire 200 and a roller surface 111enclosing the rod shaft 112.
  • the roller surface 111 can be an airy netting where humid air travels in and out of the airy netting easily through its non-obstructive air flow path.
  • the roller surface 111 can be rotated about the rod shaft 112.
  • the roller surface 111 and the rod shaft 112 also can be made in one-piece or just made separately.
  • the roller surface 111 and the rod shaft 112 also can be made of plastic, metal, wood, rubber, or any combination of these materials.
  • the humid air supplier comprises a humid air generator 500 and an incoming tube 610 for delivering humid air with high relative humidity generated by the humid air generator 500 to the second roller 110.
  • the incoming tube 610 is arranged above the insulative film 310 and in parallel with the rod shaft 112.
  • the surface of the incoming tube 610 facing the rod shaft 112 is provided multiple holes 611 for directing the humid air to the roller surface 111 of the second roller 110.
  • the humid air generator 500 can be a humidifier, a humid air jet, a water vapour evaporation from wet surface coating, from capillary action, from dipping, from printing, from heated water or any other method commonly known in the industry.
  • the insulative film 300 can be replaced by any other insulative flexible material, such as tapes or plates.
  • the static latent object can be an insulative film 310 moving along a first direction, such as the horizontal direction.
  • the rod shaft 112 is arranged above the insulative film 310 such that the roller surface 111 of the second roller 110 momentarily contacts with and then separates from a discharging surface 311 of the insulative film 310.
  • the static charge on the insulative film 310 drops drastically to less than a fraction of the original high static charge level, such as less than one-tenth.
  • the insulative film 310 can be convolved in a rotating shaft and the insulative film 310 can be moved in the horizontal direction during the rotation of the rotating shaft.
  • Figs. 7A-7C are diagrams showing a static charge reduction system according to a fifth embodiment of the present application.
  • the static charge reduction system comprises a conductor which is grounded, a static charge reduction component electrically connected to the conductor, and a humid air supplier continuously supplying humid air with an RH higher than 60%.
  • the static charge reduction component can be a dispenser 120 formed by a plate 122 provided with multiple dispensing rods 124 arranged in a circular pattern, such as one or more circular pattern.
  • the plate 122 and the multiple dispensing rods 124 can be relatively rotated with each other.
  • the plate 122 can be a rotatable circular plate, and the multiple dispensing rods 124 can be fixed on or rotateably arranged the plate 122.
  • the plate 122 can be fixed, while the multiple dispensing rods 124 can be rotatably arranged the plate 122.
  • the plate 122 can be a circular plate and made of plastic, metal, wood, rubber, or any combination of these materials.
  • the plate 122 is affixed with a side wall cover around its edge to form an enclosure 123 with an opening 121 and a core rod 125 at its middle.
  • the enclosure 123 is detachable from the plate 122.
  • the static latent object can be tape 320 which is rolled into the dispenser 120 at the opening 121, then passed through the multiple dispensing rods 124 and finally convolved on the core rod 125 or rolled out of the dispenser 120 at the opening 121 via or without via the core rod 125.
  • the plate 122 can be arranged without such core rod 125.
  • At least one of the multiple dispensing rods 124 is soaked with humid air with an RH (Relative Humidity) higher than 60% via the humid air supplier.
  • the core rod 125 is soaked with humid air with an RH (Relative Humidity) higher than 60%.
  • the multiple dispensing rods 124 and the core rod 125 are soaked with humid air with an RH (Relative Humidity) higher than 60%.
  • the whole dispenser 120 soaked with humid air with an RH (Relative Humidity) higher than 60% via a continuous humid air supplying system.
  • a discharging surface of the tape 320 contact with and then momentarily separate from at least one outer surface of at least one of the multiple dispensing rods 124 or the core rod 125, preferred all the outer surfaces of the dispensing rods 124 and the core rod.
  • the high static charge on the discharging surface of the tape 320 is surprisingly reduced to an unexpected very low level, such as less one-tenth of the initial static charge level.
  • the humid air supplier comprises a humid air generator and an incoming tube for delivering the humid air generated by the humid air generator to the static charge reduction component.
  • the incoming tube 630 connecting to the humid air generator is specifically constructed in the present embodiment.
  • the incoming tube 630 has one main tube connecting the humid air generator and two branch tubes 631 which are parallel to the travelling direction of the tape 320 and close to the opening 121, respectively.
  • the two branch tubes 631 are provided with multiple holes 61 for directing the humid air into the dispenser 120. It is preferred that just one small opening 121 is provided to allow minimum volume of humid air to move in and move out of the dispenser 120 in achieving an economic yet effective static charge reduction objective.
  • the plate 122 can have a bigger outer ring formed by the multiple dispensing rods 124 put at a bigger circumference to allow the tape 320 to make a bigger wrap around such outer ring to achieve a longer distance travelled in providing even more time for the static charge on the tape 320 to steadily drain away before being dispensed out for use.
  • Such design will achieve further improvement on the static charge reduction effectiveness especially for very sensitive microchip or assembled PCB (printed circuit board).
  • the multiple dispensing rods 124 are arranged in a regular spacing. Of course in other embodiment, the multiple dispensing rods 124 can be arranged in different ways, such as irregular spacing.
  • more dispensing rods 124 are provided for forming a two-circular pattern.
  • more dispensing rods 124 can be provided for forming more circles to achieve yet longer distance travelled in providing even more time for the static charge on the tape 320 to steadily drain away before being dispensed out for use.
  • These designs are particularly good for ultra-sensitive devices where the slightest amount of static charge will pose a great threat and high risk of causing damage to its highly complex large scale integrated circuitry.
  • Fig. 8 is a diagram showing a static charge reduction system according to a sixth embodiment of the present application.
  • the static charge reduction system comprises a conductor which is grounded, a static charge reduction component electrically connected to the conductor, and a humid air supplier continuously supplying humid air with an RH higher than 60%.
  • the static charge reduction component can be an adhesive film removal mechanical mechanism130 comprising at least two side structures 131 each having one slot 132 facing each other.
  • a pair of slidable and rotatable rods 133 are hold in the two slots 132 with both ends inserted into the slots 132 to allow free and easy sliding movement of the slidable and rotatable rods 133.
  • the adhesive film removal mechanical mechanism 130 has a low height square or rectangle structure to allow the slots 132 having a long tiny shape.
  • the two slidable and rotatable rods 133 are electrically connected to at least one of the two side structures 131 which are further electrically connected to the wire 200 via a further conductor 134.
  • the humid air supplier comprises a humid air generator 500 and an incoming tube 640 for delivering humid air with high relative humidity generated by the humid air generator 500 to the adhesive film removal mechanical mechanism 130.
  • the incoming tube 640 can having a main tube passing through a hole of the rod holder arranged on one of the side structures 131and at least two branch tubes 641 provided with multiple holes 642 for directing the humid air to the slidable and rotatable rods 133.
  • the two branch tubes 641 can be arranged at opposite sides of the slidable and rotatable rods 133.
  • the static latent object can be an adhesive film 330 on a semiconductor wafer or other carriers.
  • an initial small portion of the adhesive film 330 is peeled off from the wafer and inserted in between the gap of two slidable and rotatable rods 133, and then passed through it and be pulled upwards out from the gap.
  • the discharging surface of the adhesive film 330 momentarily contacts with and then separates from the outer of the slidable and rotatable rods 133 which may be electrically connected to the conductor, the static charge on the adhesive film 330 drops drastically to less than a half.
  • the static charge on the adhesive film 330 drops drastically to less than a fraction of the original high static charge level, such as less than one-tenth. It dependents on the contact time and the RH of the humid air soaked by the slidable and rotatable rods 133.
  • the static charge reduction component comprises at least a first roller 710, a second roller 720 and a holder 730 for holding the first roller 710 and the second roller 720.
  • the first roller 710 and the second roller 720 are electrically connected and placed in parallel to each other by means of the holder 730.
  • the incoming tube 740 further connecting a humid air generator is also supported by the holder 730.
  • the incoming tube 740 is arranged above the first roller 710 and the second roller 720, such that the holder 730 holds the incoming tube 740 and the two first roller 710 and the second roller 720 together forming a triangle-like structure to allow it moves freely on any flat surface.
  • the holder 730 can be shaped as an equicrural triangle or a right triangle.
  • the first roller 710 and the second roller 720 are arranged in parallel at a lower part of the triangle shape and the incoming tube 740 is arranged at an upper part of the triangle shape (referring Figs9A-9B.).
  • the holder also can have other shapes, such as a square shape, a rectangle or other regular or unregular shape.
  • the holder 730 is a rectangle shape holder, and two rollers are arranged in parallel at a lower part of the rectangle shape holder and two incoming tubes or three incoming tubes are arranged in parallel at an upper part of the rectangle shape holder.
  • the static charge reduction system comprises a humid air generator, a hollow compartment structure 800 and a humid air delivery element 900 for delivering the humid air generated by the humid air generator to the hollow compartment structure 800 and a roller 700.
  • the humid air generator can be constructed as discussed above, and the humid air delivery element 900 can comprises an incoming tube as discussed before and an air inlet 910 communicating the incoming tube and the hollow compartment structure 800 for delivering humid air with high relative humidity generated by the humid air generator to the hollow compartment structure 800.
  • the hollow compartment structure 800 can be a hollow semi-cylindrical compartment structure constructed from an outer and an inner semi-cylindrical walls 810, 820 with perforated air holes 830 spread all over the surface of the inner semi-cylindrical wall 820.
  • the air inlet 910 is preferably arranged between the outer and an inner semi-cylindrical walls 810, 820.
  • the roller 700 is placed along the centre axis of the hollow semi-cylindrical structure by means of two side holders placed at the extreme ends of the hollow compartment structure 800.
  • hollow compartment structure 800 can be constructed in any shape, such as hollow cylindrical shape, hollow cube shape and so on.
  • Figs.11A-11B are diagrams showing preferred embodiments of the rollers.
  • the roller 700 can be wrapped with a static dissipative or conductive layer of flexible foam sheet 760 to form a soft surface conductive roller.
  • a static dissipative or conductive layer of flexible foam sheet 760 to form a soft surface conductive roller.
  • Such add-on wrapping surprisingly achieves a very similar result as the conductive roller without any wrapping.
  • the addition of conductive foam is to provide a soft surface to improve the contacting surfaces between the film and the conductive rod to achieve optimum static charge reduction performance.
  • the roller 700 can be wrapped with a static dissipative or conductive layer of protruding stubs 770 in covering the full surface of the roller to form an evenly spread protruded static dissipative or conductive stubs surface.
  • a static dissipative or conductive layer of protruding stubs 770 in covering the full surface of the roller to form an evenly spread protruded static dissipative or conductive stubs surface.
  • the evenly spread protruded static dissipative or conductive stubs surface design will minimise contact surface area to minimise contact contamination risk in certain specialized application.
  • the mechanical design structure provides a means to achieve consistent peel direction in the adhesive film removal process in achieving consistent optimum low static charge generation.

Landscapes

  • Elimination Of Static Electricity (AREA)

Abstract

L'invention concerne un système de réduction de charge statique utilisant de l'air humide comprenant un conducteur connectant une source de basse tension, un composant de réduction de charge statique présentant au moins une première surface et un dispositif d'alimentation en air humide fournissant en continu de l'air humide à un RH supérieur à 60 % à la première surface du composant de réduction de charge statique et/ou une surface de décharge d'un objet latent statique qui conserve une charge statique élevée. En mettant momentanément en contact et en séparant la première surface du composant de réduction de charge statique et la surface de décharge de l'objet latent statique, la charge statique sur l'objet latent statique chute de façon spectaculaire d'au moins 50 %.
PCT/CN2019/099920 2018-08-10 2019-08-09 Système de réduction de charge statique utilisant de l'air humide WO2020030082A1 (fr)

Priority Applications (1)

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CN2018099858 2018-08-10
CNPCT/CN2018/099858 2018-08-10

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