Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
  • H01T19/00—Devices providing for corona discharge
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
  • B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/06—PE, i.e. polyethylene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/10—Polymers of propylene
  • B29K2023/12—PP, i.e. polypropylene

Definitions

• the present invention relates to a surface treatment system for treating a surface of an object by means of electrical discharge.
• 2002-292272 discloses a device in which corona discharge is generated between an elongated discharge electrode held by an electrode holder and an earth roll, and the surface of the object to be treated is modified by moving an object to be treated such as a film or the like on the earth roll with the object to be treated being allowed to intersect with the discharge electrode, while the discharge electrode is held relative to an electrode-side rail elongated along the longitudinal direction of the discharge electrode to hang and hold the electrode -side rail in a freely slidable manner relative to the electrode holder through a slide unit.
• the wettability of the object is improved in a subsequent printing process by modifying the object to be treated such as a film or the like by means of corona discharge, improving the endurance of printed characters.
• a film is treated by allowing the same to travel at a high speed and hence if the film snakes its way in the lateral direction (transverse shift), it is possible for the discharge electrode to follow this snaking movement.
• a high-voltage current needs to be supplied to the discharge electrode to perform corona discharge or plasma discharge, and thus use of a coated conductor such as a jacketed cable or the like is likely to put a user at risk of electrical shock.
• corona discharge and plasma discharge give rise to ozone from a discharge electrode and therefore the ozone generated should be disposed of.
• an object of the present invention to provide a surface treatment system in which a conductor through which a high-voltage current flows can be insulated and ozone thus generated can be disposed of.
• a surface treatment system including a discharge electrode and a conductor for connecting said discharge electrode with an electric source to modify a surface of an object to be treated by electric discharge generated by said discharge electrode, characterized in comprising: a casing in which said discharge electrode is provided; a duct having one end coupled to said casing, said duct allowing said conductor to be arranged thereinside with said duct and conductor being spaced apart from each other, and, an exhaust section provided at an other end of said duct.
• a second aspect of the present invention is a surface treatment system of the first aspect, further including an exhaust fan for sucking air from the casing toward the exhaust section.
• a third aspect of the present invention is a surface treatment system of the first or second aspect, in which the casing is movably provided and the duct is retractably formed.
• a fourth aspect of the present invention is a surface treatment system of the third aspect, in which the duct is a retractable double pipe.
• a fifth or sixth aspect of the present invention is a surface treatment system of the foregoing third or fourth aspect, in which the conductor is retractable.
• Seventh to ninth aspects of the present invention are a surface treatment system of any one of the foregoing first to third aspects, further including an ozone disposal unit for disposing of ozone generated by the electrical discharge.
• ltenth to twelfth aspects of the present invention are a surface treatment system of any one of the foregoing seventh to ninth aspects, in which the ozone disposal unit is provided on a downstream side of the exhaust section in the duct.
• Thirteenth to fifteenth aspects of the present invention are a surface treatment system of any one of the foregoing first to third aspects, in which the discharge electrode generates corona discharge and is coated with an insulator.
• the conductor is arranged inside the duct and thus can be insulated from external and further the ozone generated by the electrical discharge can be exhausted from the exhaust section of the duct coupled to the casing.
• an exhausting action of ozone and heat dissipation of the discharge electrode can be effectively carried out in addition to the effect produced by the first aspect.
• the duct is retractable along with the movement of the casing in addition to the effect produced by the first or second aspect.
• the duct becomes retractable by varying an overlapped length in the double pipe in addition to the effect produced by the third aspect.
• the duct and the conductor become retractable along with the movement of the casing in addition to the effect produced by the third or the fourth aspect.
• ozone can be disposed of by the ozone disposal unit in addition to the effect produced by any one of the first to third aspects.
• the ozone disposal unit provided on the downstream side of the exhaust section of the duct can dispose of ozone in addition to the effect produced by any one of the seventh to ninth aspects.
• an aluminum evaporated film or the like can be treated in addition to the effect produced by any one of the first to third aspects.
• FIG. 1 is a cross-sectional view illustrating a main part of the surface treatment system in accordance with an embodiment of the invention.
• FIG. 2 is a cross-sectional view taken on an A-A line of FIG. 1, showing the embodiment according to the present invention.
• FIG. 3 is a schematic view illustrating a device showing the embodiment according to the present invention.
• FIG. 4 is a schematic view illustrating a structure around an ozone disposal unit showing the embodiment according to the present invention.
• FIG. 1 to FIG. 4 show the embodiment of the present invention.
• a corona discharge surface treatment device acting as a surface treatment system of the present invention comprises a discharge electrode 2 acting as a corona electrode.
• the discharge electrode 2 is arranged at a given interval between itself and an earth roll 1 and is connected with an electric power unit 4 via a conductor 3.
• the electric power unit 4 and the earth roll 1 are then electrically connected to each other, while the earth roll 1 is earthed and a film 5, as an object to be treated, is drawn from a roll R around which the film 5 is wound and then the film 5 drawn is allowed to pass through a portion between the earth roll 1 and the discharge electrode 2 to modify the film 5 by corona discharge generated by the discharge electrode 2.
• the electric power unit 4 includes an output unit 6 and a controller 7 for controlling the output unit 6.
• the film 5 in the present embodiment may, for example, be a film whose surface is made of PP (polypropylene), PE (polyethylene), etc.
• a roll film is used which has 40 ⁇ m in thickness, 380mm in width and 1,000m in length.
• the surface treatment system is installed in various packaging machines to be used for, e.g., a printer which prints an expiration date or the like. Ink adhesion is improved by performing a printing operation after having modified a printing part on the film 5.
• the periphery of the electrode body 2A thus cylindrically formed is coated with an insulator 2B such as ceramic or the like so that the insulator 2B acts as a dielectric body. Since the electrode body 2A is cylindrically formed and is coated with the insulator 2B in this way, local discharge from the electrode body 2A can be controlled. Hence, it becomes possible to perform surface treatment to an aluminum evaporated film having an aluminum layer on a film. In other words, although pores are formed in the aluminum layer if local discharge is applied to the aluminum evaporated film, the electrode body 2A according to the present embodiment is coated with the insulator 2B, thus enabling the controlling of the local discharge.
• the casing 11 is elongated, corresponding to a length of the earth roll
• the electrode bodies 2A are provided side by side in the circumferential direction of the earth roll 1.
• a plurality of sliding bodies 12 are provided on an upper surface of the casing H, while a pair of right-and-left guide rods 13 is arranged on the upper surface of the casing H so that the sliding bodies 12 may be slidably movable along the guide rods 13.
• the guide rods 13 are arranged approximately in parallel with the earth roll 1 and are fixed to a machine body of the system.
• Both the first and second pipes 22, 23 are made of a hard material, having insulation properties, made, for example, of transparent polycarbonate, with the first end of the first pipe 22 being coupled to the casing 11, while the second pipe 23 being coupled to an exhaust path 32 of an ozone disposal unit 31.
• the duct 21 is arranged so as to intersect with a conveying direction of the film 5 and protrude from the earth roll 1.
• the conductor 3 is provided inside the duct 21.
• the conductor 3 comprises a first conductor 25 and a second conductor 26 which are made of an electrical conducting material such that the first conductor 25, made up of a pipe, has a second end into which a first end of the second conductor 26 is slidably inserted.
• An insulated mounting member 27 is fixed to both sides of the first conductor 25. By fixing these insulated mounting members 27 to the first pipe 22, the first conductor 25 is mounted on the center of the first pipe 22. Further, the insulated mounting member 27 is fixed to the second end of the second conductor 26 such that by fixing the insulated mounting member 27 to the second end of the second pipe 23, the second conductor 26 is mounted on the center of the second pipe 23. Accordingly, when moving the casing 11 along the guide rods 13, the first pipe 22 moves relative to the second pipe 23 fixed, and at the same time, the first conductor 25 moves relative to the second conductor 26. In this case, as shown in FIG.
• a movement driving means 14 which performs driving control so as to move the casing 11, the first pipe 22 and the first conductor 25 along the guide rods 13.
• the ozone disposal unit 31 is coupled to the exhaust section 24 of the duct 21.
• the ozone disposal unit 31 includes an exhaust path 32, in which are provided a flow volume detection means 33, a filter 34, an ozone catalyst 35 acting as an ozone disposal means, an exhaust fan 36 and an ozone concentration detector 37, arranged in that order starting with a side of the exhaust section 24.
• manganese dioxide is used as the ozone catalyst 35 in the present embodiment.
• the corona discharge surface treatment device By driving the exhaust fan 36, air is sucked from a side of the casing 11 to the exhaust path 32 to be exhausted, while the flow volume detection means 33 detects an airflow to check the operation of the exhaust fan 36. Then, when the volume of an exhausted gas is smaller than a preset volume, the corona discharge surface treatment device is halted.
• the filter 34 captures dusts or the like mixed with the exhaust gas so that the exhaust gas whose dusts have been removed therefrom passes through the ozone catalyst 35, thereby decomposing the ozone contained in the exhaust gas without clogging the ozone catalyst 35.
• the controller 7 is incorporated with a program for halting the operation of the output section 6 to cut electrical power transmission to the conductor 3 when the signal has been transmitted to the controller 7 by the signaling means. Accordingly, even if the volume of ozone exceeds the control level of concentration, discharge from the discharge electrode 2 is able to be automatically turned off, thus ensuring higher safety.
• the ozone concentration detector 37 includes the signaling means, the present invention is not necessarily limited to this scheme, but a notifying means may be provided which notifies an excessive volume of ozone passing through the exhaust path 32 by emitting sounds or light when the volume of ozone has exceeded the control level of concentration.
• a high" voltage current is applied to the discharge electrode 2 through the conductor 3 by the electric power unit 4 to generate corona discharge by means of the discharge electrode 2, thus modifying the film 5 by means of this corona discharge.
• the conductor 3 is housed within the duct 21 without being exposed to the outside, to thereby be insulated from external and hence the insulation of the conductor 3 can be ensured without coating the conductor 3.
• the exhaust fan 36 operates and thus air containing ozone in the casing 11 is allowed to pass through the duct 21 to be sucked and exhausted by the ozone disposal unit 31.
• the corona discharge surface treatment device acting as a surface treatment system, comprising the discharge electrode 2 and the conductor 3 for connecting the discharge electrode 2 with the electric power unit 4 acting as an electric source to modify the surface of the film 5 as an object to be treated by means of discharge generated by the discharge electrode 2, wherein the discharge electrode 2 is provided in the casing 11, to which one end of the duct 21 is coupled and then the conductor 3 is arranged inside the duct 21 with the conductor 3 spaced apart from the duct 21 and further the exhaust section 24 is provided at the other end of the duct 21.
• the conductor 3 can be insulated from external and further ozone generated by corona discharge and plasma discharge can be exhausted from the exhaust section 24 of the duct 21 coupled to the casing 11.
• a duct and a conductor are separately provided, resulting in the large size of the device.
• the duct 21 and the conductor 3 do not need to be separately provided and the conductor 3 is arranged inside the duct 21, thus producing an effect of downsizing, by just that much.
• the exhaust fan 36 for sucking air from the casing 11 into the exhaust section 24.
• the casing 11 is movably provided while the duct 21 is retractably formed.
• the duct 21 is retractable in conjunction with the movement of the casing 11.
• the duct 21 is a retractable double pipe.
• the overlapping length of the first and second pipes is allowed to vary and thus the duct 21 can retractably operate. Since the overlapping length is adjustable, a pipe material made of a hard substance can be used for the first and second pipes.
• the conductor 3 is retractable and hence the duct 21 and the conductor 3 become retractable along with the movement of the casing 11. Furthermore, according to the present embodiment, there is provided the ozone catalyst 35 acting as an ozone disposal means for disposing of the ozone generated by corona discharge and plasma discharge and hence the ozone can be disposed of by the ozone catalyst 35.
• the casing 11 is provided on the upstream side of the duct 21 while the ozone catalyst 35 acting as an ozone disposal means is provided on the other-end side of the duct 21.
• ozone can be disposed of by the ozone catalyst 35 provided on the downstream side of the exhaust section 24 of the duct 21.
• the discharge electrode 2 even though the discharge electrode 2 generates corona discharge, the discharge electrode 2 is coated with the insulator 2B and thus local discharge can be controlled.
• the casing 11 can move by means of the movement driving means 14 so as to follow the lateral movement.
• the duct 21 is formed from a transparent or semi-transparent material for the conductor inside the duct 21 to be visible and hence the state of the conductor 3 inside the duct can be checked.
• the inner diameter of the second pipe 23 is made larger than the outer diameter of the first pipe 22 to form a gap between the other-end side of the first pipe 22 and the one-end side of the second pipe 23 with both the pipes not in contact with each other in the inserted state of the both. Hence, the first pipe 22 can be smoothly moved.
• the overlapping length of the first pipe 22 and second pipe 23 is larger than at least the diameter of the first pipe 22 and further air is sucked to a side of the exhaust section 24 located on a more downstream side than the casing 11 and therefore even if the gap exists between the other-end side of the first pipe 22 and the one-end side of the second pipe 23 with one being inserted into the other, ozone is not leaked outward.
• the present invention is not limited to the embodiment described above and various modifications are possible.
• the double pipe is shown as the duct.
• three or more pipes may be formed as a sheathed pipe.
• the conductor not limiting to two conductors, three or more conductors may be slidably coupled.
• the filter 34 a heat-treating filter for heat-treating ozone and an absorbing filter for absorbing ozone may be utilized, allowing these filters to work as an ozone disposal unit.
• a figure of the casing 11 is not limited to a rectangle shown in the embodiment and may be accordingly selectable.
• a non-retractable one may be adopted by utilizing only one duct or the like and in this case, it goes without saying that only one conductor is used to adopt a scheme of taking advantage of a non-retractable conductor.
• the discharge electrode 2 according to the present embodiment is a pair of the electrode bodies 2A, 2A.
• the electrode body may be one.
• a corona discharge surface treatment device is utilized.
• an atmospheric plasma surface treatment system may be utilized.
• an air sending means may be provided on a side of the casing 11 and as a result air may be sent by the air sending means from a side of the casing 11 to the exhaust section and the exhaust path.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Plasma & Fusion (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Oxygen, Ozone, And Oxides In General (AREA)
• Treatments Of Macromolecular Shaped Articles (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)

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Citations (2)

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• 2008
  • 2008-11-11 JP JP2008289274A patent/JP5332526B2/ja active Active
• 2009
  • 2009-11-10 WO PCT/JP2009/069510 patent/WO2010055951A1/en active Application Filing
  • 2009-11-10 CN CN200980144864.8A patent/CN102210074B/zh not_active Expired - Fee Related

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