JP6444675B2 - Bottle surface treatment apparatus and bottle surface treatment method - Google Patents

Description

  The present invention relates to a bottle surface treatment apparatus and a bottle surface treatment method for treating the inner surface of a bottle.

  Surface treatment is performed in order to modify the surface of a resin container to be hydrophilic or hydrophobic. For example, in Patent Document 1, a gas is supplied through a conduit that opens inside a container, and a glow is generated between electrodes that may be coated with an optional dielectric that is disposed inside and outside the container or both outside the container and facing each other. A plasma treatment method for the inner surface of a container in which discharge is performed is disclosed.

JP-A-5-269370

  However, in the technique of Patent Document 1, it is necessary to supply a gas such as argon, which is expensive to manufacture. Further, the bottle has a narrower opening than the bottle body, and even if an electrode is inserted, it is difficult to efficiently reform the entire inside of the bottle.

  Therefore, the present invention has been made in view of the above-mentioned problems and the like, and an example of the problem is to provide a surface treatment device for a bottle that can reduce the cost and efficiently reform the entire inside of the bottle. With the goal.

In order to solve the above-mentioned problem, the invention according to claim 1 is a bottle surface treatment device for modifying the inner surface of a resin bottle by corona discharge, and an electrode capable of passing through the opening of the bottle; The electrode to which the voltage generating the corona discharge is applied is passed through the opening of the bottle, and the bottom of the inner surface of the bottle is changed until the mode of the corona discharge is changed for processing the bottom of the inner surface of the bottle. Driving means for bringing the bottle into contact, and at least a part of the outside of the bottle has a grounded conductor, and an insulator between the bottle and the conductor, and the insulator is disposed on the bottle. not protrude from the conductor in an opening direction, characterized in Rukoto.

Therefore, the electrode that has passed through the opening of the bottle is brought close to the bottom of the inner surface of the bottle and the manner of corona discharge is changed to efficiently treat the bottom of the bottle. You can quality. Furthermore, there is no need to supply a special gas such as argon, and the cost can be reduced. In this case, the directivity of discharge from the electrode toward the bottle B is improved, and the inner surface of the bottle can be efficiently modified. In this case, the discharge from the electrode becomes stable and uniform reforming is easy. In this case, stable discharge of the electrode is ensured from the top of the opening of the bottle to the entire inner surface of the bottle, and surface treatment can be performed.

  Further, the invention according to claim 2 is the bottle surface treatment apparatus according to claim 1, wherein the driving unit is configured to connect the electrode until the discharge along the bottom of the inner surface of the bottle occurs. It is characterized by being closer to the bottom of the inner surface.

  In this case, the entire inner surface of the bottom of the bottle is easily modified. Also, the bottom is modified in a shorter time.

  The invention according to claim 3 is the bottle surface treatment apparatus according to claim 1 or 2, wherein the electrode has a deployment mechanism that can be deployed after passing through the opening of the bottle. And

  In this case, since the tip of the electrode opens after passing through the opening of the bottle and the tip of the electrode approaches the side wall of the inner surface of the bottle, the side wall of the inner surface of the bottle can be efficiently modified.

In addition, the invention according to claim 4 is the bottle surface treatment apparatus according to any one of claims 1 to 3 , wherein the driving unit is configured to connect the electrode with the opening direction of the bottle as an axis. The electrode is brought close to the bottom of the inner surface of the bottle while rotating the bottle relatively.

  In this case, surface treatment with improved uniformity can be performed.

The invention described in Claim 5, in the bottles for surface treatment method of the inner surface of the resin bottle bottle surface treatment apparatus that modified by corona discharge, the electrode capable of passing through the opening of the bottle, the A voltage applying step for applying a voltage for generating corona discharge; an inserting step for inserting the electrode to which the voltage is applied through the opening of the bottle into the bottle; and for processing the bottom of the inner surface of the bottle And a bottom treatment step for bringing the electrode closer to the bottom of the inner surface of the bottle until the mode of corona discharge from the electrode changes, and the bottle surface treatment device is disposed on at least a part of the outside of the bottle. , especially the grounded conductor, and an insulator between the conductive member and the bottle, said insulator, that you have to protrude from the conductive to the opening direction of the bottle To.

  According to the present invention, the electrode that has passed through the opening of the bottle is brought close to the bottom of the inner surface of the bottle, and the corona discharge mode is changed to efficiently treat the bottom of the bottle. The entire interior can be modified. Furthermore, there is no need to supply a special gas such as argon, and the cost can be reduced.

It is a mimetic diagram showing an example of outline composition of a surface treatment device for bottles concerning an embodiment of the present invention. It is a schematic diagram which shows an example which set the bottle to the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the electrode of FIG. The process of blow molding is shown, (A) shows the supply of the preform, (B) shows the heating of the preform, and (C) shows the blow molding. It is a flowchart which shows the operation example of the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the mode of the corona discharge process in the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the mode of the corona discharge process in the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the mode of the corona discharge process in the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the mode of the corona discharge process in the surface treatment apparatus for bottles of FIG. It is a schematic diagram which shows an example of the mode of the corona discharge process in the surface treatment apparatus for bottles of FIG. (A) to (E) are schematic views showing modifications of the electrode of FIG. (A) to (E) are schematic views showing modifications of the electrode insertion step. (A) to (C) are schematic views showing a modification of the electrode of FIG. 1 and an example of an electrode having a deployment mechanism. FIGS. 9A to 9C are schematic diagrams illustrating an example of a state of corona discharge treatment in the electrode of FIG. It is a schematic diagram which shows the modification of the earth | grounded conductor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment described below is embodiment at the time of applying this invention with respect to the surface treatment apparatus for bottles.

[1. Overview of bottle surface treatment equipment and functions]
First, the configuration and outline function of a bottle surface treatment apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic diagram illustrating a schematic configuration example of a bottle surface treatment apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view showing an example in which a bottle is set in a bottle surface treatment apparatus. FIG. 3 is a schematic diagram illustrating an example of an electrode.

  As shown in FIG. 1, the bottle surface treatment apparatus 10 applies an electrode 11 that can pass through an opening of a resin bottle B, a grounded ground portion 12, and a voltage at which corona discharge is generated at the electrode 11. A power supply unit 13 for driving, a drive unit 14 for inserting the electrode 11 into the inside of the bottle B, a drive unit 15 for covering the bottle B with the ground unit 12, and a control unit 16 for controlling the movement of the drive unit 14 and the drive unit 15 It is equipped with.

  The bottle surface treatment apparatus 10 modifies the inner surface of the bottle B by corona discharge. For example, electrons emitted from the electrode 11 by corona discharge are accelerated in an electric field and collide with electrons and molecules in the atmosphere, thereby causing excitation, dissociation, and ionization. Electrons are also emitted from ionized atoms and molecules. Electrons reach the surface layer of the resin and cut off the main chain and side chain of the polymer bond. The polymer surface layer thus cut is in a chemically radical state. And, oxygen radicals, ozone, etc. in the gas phase are recombined with the main chain or side chain, thereby introducing a polar functional group such as a hydroxyl group or a carbonyl group, and imparting hydrophilicity to the surface layer of the resin, Improves wettability. That is, the surface of the resin is modified.

  The bottle B is held at a predetermined position of the bottle surface treatment apparatus 10 by the holding unit 17.

  Here, as shown in FIG. 2, the bottle B includes a body part b1, a bottom part b2 that closes the bottom of the body part b1, and at least one opening part b3 provided on the side facing the bottom part b2.

  The shape of the body part b1 of the bottle B is, for example, a substantially cylindrical shape. The shape of the trunk | drum b1 spreads from the opening part b3, and transfers to a cylindrical shape. In addition, in order to increase the strength of the bottle B, the body part b1 of the bottle B may have a waveform in part in the direction from the bottom part b2 to the opening part b3. Further, the shape of the body portion b1 of the bottle B may be other shapes such as a rectangular tube shape, for example.

  In the tubular opening b3, a male screw is formed on the outside, and in order to close the bottle B, a female screw is formed and a cap is attached. The size of the opening of the opening b3 is smaller than the size of the bottom b2, and smaller than the cross section of the body b1.

  In addition, as a material of the bottle B, low density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, a single substance or a mixture of two or more kinds of polyolefins such as cyclic polyolefin, ethylene-vinyl alcohol copolymer, nylon, polyethylene It consists of a non-olefin resin such as terephthalate, and consists of a single layer of these resins or a multilayer structure of two or more types. A part of the bottle B may be formed by vapor deposition made of metal or inorganic material, metal foil, or other materials. At least the inner surface of the bottle B is formed of the resin. The size of the bottle B can be set to 500 mL capacity, for example. In addition, the object filled in the bottle B may be not only a liquid but also an object including a granular material, a lump or the like, or a highly viscous object.

  As shown in FIG. 3, the electrode 11 has an electrode discharge part 11a and an electrode support 11b.

  The electrode 11 is a metal conductor such as stainless steel. The electrode 11 has a shape and size that can pass through the opening of the bottle B, and has a length that can approach the bottom of the inner surface of the bottle B. For example, the electrode discharge part 11 a has a disk shape smaller than the inner diameter of the opening of the bottle B, and the electrode support 11 b has a length that can approach the bottom of the inner surface of the bottle B.

  The ground portion 12 (an example of a grounded conductor) includes a conductive portion 12a that is a metal conductor such as stainless steel, and an insulating portion 12b such as a resin. Examples of the conductor include stainless steel, iron, copper, brass, aluminum, gold-plated metal, carbon, conductive polymer, and the like.

  The conductive portion 12a (an example of a conductor that is grounded to at least a part of the outside of the bottle) has a bottom portion and has a shape that covers the bottom portion and the trunk portion of the bottle B. For example, when the body portion of the bottle B is cylindrical, the conductive portion 12a is larger than the bottle B. In addition, the conductive portion 12a is grounded.

  The insulating portion 12b (an example of an insulator between the bottle and the conductor) is made of resin, has a predetermined thickness, exists between the bottle B and the conductive portion 12a, and functions as a spacer. For example, the insulating part 12b has a bottom, the inside of the insulating part 12b has a shape into which the bottle B can be inserted, and the outside has a shape that fits in the conductive part 12a. The insulating part 12b has a part of the outer peripheral surface of the insulating part 12b and the bottom part in contact with the conductive part 12a.

  Examples of the material of the insulating portion 12b include phenol resin, epoxy resin, polypropylene, polyethylene, polyethylene terephthalate, and the like.

  Furthermore, the insulating part 12b protrudes from the conductive part 12a in the opening direction of the bottle B. That is, the length (depth) in the longitudinal direction of the insulating portion 12b is longer than the height of the bottle B. Further, the length (depth) of the conductive portion 12a in the longitudinal direction is preferably about the same as the height of the opening b3 of the bottle B in the state where the insulating portion 12b exists.

  The power supply unit 13 is a power supply that generates a high voltage with constant power. The power supply unit 13 includes a converter that performs frequency conversion for increasing the frequency of the commercial power supply, a high-voltage transformer that boosts voltage to generate corona discharge, and the like. The power supply unit 13 applies a high voltage that causes corona discharge to the electrode 11. The power supply unit 13 may be a constant voltage or a constant current.

  The drive unit 14 (an example of a drive unit) includes a motor such as a servo motor. The drive unit 14 is connected to the electrode 11. As shown in FIG. 2, the driving unit 14 performs driving to insert the electrode 11 into the bottle B through the opening of the bottle B. And the drive part 14 approaches the bottom part of the inner surface of the bottle B, and performs the drive extracted from the bottle B. The driving unit 14 may perform an operation of inserting or removing the electrode 11 while rotating the electrode 11 about the major axis direction of the electrode 11 (the opening direction of the bottle B).

  The drive unit 15 (an example of a drive unit) includes a motor such as a servo motor. The drive unit 15 is connected to the bottom of the ground unit 12. As shown in FIG. 2, the drive unit 15 drives the ground unit 12 so as to cover from the bottom of the bottle B. After the discharging process, the drive unit 15 drives the ground unit 12 so as to remove the ground unit 12 from the bottle B. In addition, the drive part 15 may rotate the earthing | grounding part 12 in which the bottle B was set with the bottle B about the major axis direction (opening direction of the bottle B) of the electrode 11 as an axis | shaft.

  The control unit 16 includes a CPU (Central Processing Unit) and a memory. Based on the program stored in the memory, the CPU controls on / off of the power supply unit 13, voltage, and the like, and controls driving of the driving unit 14 and the driving unit 15. Further, the control unit 16 may control the operation of the holding unit 17.

[2. Operation of surface treatment equipment for bottles]
(2.1 Bottle molding operation)
First, the operation of bottle forming will be described with reference to FIG.

  FIG. 4 shows a blow molding process, where (A) shows the supply of the preform, (B) shows the heating of the preform, and (C) shows the blow molding.

  In a bottle filling system (not shown) for filling the bottle B with liquid or the like, as shown in FIG. 4 (A), the mandrel 6 enters the opening b3 of the inverted preform pB, and the preform pB is inserted. receive.

  As shown in FIG. 4B, the mandrel 6 that has received the preform pB travels along the heater 7 in the heating chamber of the bottle filling system, and the preform pB held in each mandrel 6 is moved by the heater 7. Heated. This heating raises the preform pB to a temperature at which blow molding is possible.

  As shown in FIG. 4C, the blow molding die 8 can be divided into two symmetrically. When the heated preform pB arrives, the blow mold 8 sandwiches the preform pB together with the mandrel 6 while rotating around the turntable. The blow nozzle 9 is inserted into the preform pB through a through hole formed in the center of the mandrel 6. Then, by blowing a gas such as air from the blow nozzle 9 into the preform pB, the bottle B is molded inside the blow molding die 8.

  The formed bottle B is transported to the bottle surface treatment apparatus 10 by a transport device (not shown).

  Examples of the bottle molding method include various methods such as injection blow, direct blow, and injection molding.

(2.2 Bottle surface treatment)
Next, the bottle surface treatment operation of the bottle surface treatment apparatus 10 will be described with reference to FIGS. 5 to 6E.

  FIG. 5 is a flowchart showing an operation example of the bottle surface treatment apparatus 10. 6A to 6E are schematic views showing an example of a state of corona discharge treatment in the bottle surface treatment apparatus 10.

  As shown in FIG. 5, the bottle B is set (step S1). Specifically, the bottle B conveying apparatus conveys the blow-molded bottle B to the bottle surface treatment apparatus 10. As shown in FIG. 2, the bottle B held by the holding unit 17 is set at a predetermined position of the bottle surface treatment apparatus 10. The bottle surface treatment apparatus 10 confirms by a sensor or the like whether the bottle B is set at a predetermined position.

  And by control of the control part 16 of the surface treatment apparatus 10 for bottles, the drive part 14 drives the ground part 12 in the opening direction of the bottle B so that the bottle B is accommodated in the ground part 12 from the bottom part of the bottle B. . Then, as shown in FIG. 6A, the bottle B is stored in the ground portion 12.

  Next, the bottle surface treatment apparatus 10 applies a voltage to the electrode 11 (step S2). Specifically, under the control of the control unit 16 of the bottle surface treatment apparatus 10, the power supply unit 13 applies a voltage to the electrode 11 such that corona discharge is generated in the air from the electrode discharge unit 11 a of the electrode 11. . As shown in FIG. 6A, a corona discharge C1 is generated from the circumferential portion of the disk of the electrode discharge portion 11a. Since the electrode discharge part 11a is separated from the conductive part 12a of the ground part 12, the corona discharge C1 is a discharge mode of corona discharge with weak directivity.

  Next, the bottle surface treatment apparatus 10 starts an insertion operation of the electrode 11 (step S3). Specifically, under the control of the control unit 16, the drive unit 14 of the electrode 11 starts an insertion operation of the electrode 11 generating corona discharge. The drive unit 14 may be inserted while rotating the electrode 11. Or you may make it the drive part 15 rotate the earth | ground part 12 with the bottle B, and rotate the bottle B and the electrode 11 relatively.

  Next, when the electrode discharge part 11a approaches the conductive part 12a, the discharge mode changes to corona discharge whose directivity increases in the direction of the conductive part 12a. Then, as shown in FIG. 6B, when the electrode discharge part 11a enters the opening b3 of the bottle B, a corona discharge C2 having strong directivity is generated from the circumferential part of the electrode discharge part 11a. The corona discharge C2 is a corona discharge discharge mode with strong directivity. Then, as the electrode discharge part 11a passes through the narrow inner diameter part of the opening b3 of the bottle B, the surface of the inner diameter part of the opening b3 is modified by the corona discharge C2.

  In addition, since the distance of the surface of the internal diameter part of the opening part b3 of the bottle B and the circumferential part of the electrode discharge part 11a is near, the drive part 14 may let the electrode discharge part 11a pass early.

  As shown in FIG. 6C, the driving unit 14 further inserts the electrode 11 into the bottle B. As the electrode 11 is inserted, the inner surface of the body portion b1 of the bottle B is sequentially modified by the corona discharge C2.

  Next, the bottle surface treatment apparatus 10 brings the electrode 11 close to the bottom surface of the bottle B (step S4). Specifically, the drive unit 14 of the electrode 11 brings the electrode discharge unit 11a closer to the bottom b2 of the inner surface of the bottle B under the control of the control unit 16. As shown in FIG. 6D, when the electrode discharge part 11a approaches the bottom part b2 of the inner surface of the bottle B, the surface discharge corona discharge starts from the circular part of the electrode discharge part 11a (the face opposite to the bottom surface of the conductive part 12a). C3 is generated. Since the impedance of the surface portion of the electrode discharge part 11a and the conductive part 12a of the ground part 12 is lower than the impedance of the circumferential part of the electrode discharge part 11a and the conductive part 12a of the ground part 12, the surface of the electrode discharge part 11a A surface discharge corona discharge C3 (an example of a discharge for treating the bottom b2 of the inner surface of the bottle B) is generated from the portion. That is, the corona discharge mode changes from the corona discharge C2 to the corona discharge C3.

  The bottom b2 of the inner surface of the bottle B begins to be modified by the corona discharge C3 of the surface discharge.

  The driving unit 14 or the driving unit 15 may bring the electrode 11 closer to the bottom b2 on the inner surface of the bottle B while relatively rotating the electrode 11 and the bottle B around the opening direction of the bottle B.

  Further, when the electrode discharge portion 11a is brought close to the bottom b2 of the inner surface of the bottle B, as shown in FIG. 6E, the corona discharge C3 is discharged to the discharge C4 (an example of a discharge for processing the bottom b2 of the inner surface of the bottle B). The manner of changes. The discharge C4 is a creeping discharge along the inner surface of the bottom b2. A discharge is generated such that the corona discharge discharged from the surface portion of the electrode discharge portion 11a spreads along the bottom portion b2 of the inner surface of the bottle B over the entire inner surface of the bottom portion b2. Due to the discharge C4, the entire inner surface of the bottom b2 is easily modified.

  Next, the bottle surface treatment apparatus 10 starts an operation of removing the electrode 11 (step S5). Specifically, under the control of the control unit 16, the driving unit 14 of the electrode 11 starts an operation of pulling out the electrode 11 that has generated corona discharge. As the electrode 11 is removed, the discharge response changes from the discharge C4 to the corona discharge C3 instead of the corona discharge C3. Even in the operation of removing the electrode 11, the inner surface of the bottle B is modified. The drive unit 14 may pull out the electrode 11 while rotating the electrode 11. Further, the operation of removing the electrode 11 by stopping the application of voltage may be performed.

  Next, the bottle surface treatment apparatus 10 stops the application of voltage (step S6). Specifically, when the position of the electrode 11 comes to a position as shown in FIG. 6A, the power supply unit 13 stops the application of voltage to the electrode 11 under the control of the control unit 16, and the corona discharge is generated. stop. In addition, since the inner diameter part of the opening part b3 of the bottle B is close to the circumferential part of the electrode discharge part 11a and is easily modified, the position of the electrode 11 comes to a position as shown in FIG. 6B. The power supply unit 13 may stop applying the voltage to the electrode 11.

  Next, the bottle surface treatment apparatus 10 removes the bottle B (step S7). Under the control of the control unit 16, the drive unit 14 drives the ground unit 12 so as to remove the bottle B stored in the ground unit 12. The bottle B held by the holding unit 17 is removed from the fixed position of the bottle surface treatment apparatus 10, and the conveying device conveys the bottle B to the next process position.

  As described above, according to the present embodiment, the electrode 11 that has passed through the opening b3 of the bottle B is brought close to the bottom b2 on the inner surface of the bottle B, and the corona discharge mode is changed to achieve efficiency up to the bottom b2 of the bottle B. Since it is processed well, the entire inside of the bottle B can be reformed efficiently. Furthermore, it is not necessary to supply a special gas such as argon, and the corona discharge is performed in the normal atmosphere, so that the cost can be reduced.

  Further, when the electrode 11 is further brought closer to the bottom b2 of the inner surface of the bottle B until the discharge C4 along the bottom b2 of the inner surface of the bottle B occurs, the entire inner surface of the bottom b2 is easily modified. Further, the bottom b2 is reformed in a shorter time.

  When at least a part of the outside of the bottle B has a grounded conductive portion 12a (an example of a conductor), the directivity of discharge from the electrode discharge portion 11a toward the bottle B is improved, and the bottle B The inner surface can be efficiently modified.

  Moreover, when it has the insulation part 12b (an example of an insulator) between the bottle B and the electroconductive part 12a, the discharge from the electrode discharge part 11a is stabilized and it becomes easy to perform uniform modification | reformation.

  Moreover, when the insulating part 12b (an example of an insulator) protrudes from the conductive part 12a (an example of a conductor) in the opening direction of the bottle B, all the inner surfaces of the bottle B from the top of the opening of the bottle B Stable discharge of the electrode 11 is ensured and surface treatment can be performed.

  Further, when the electrode 11 is brought closer to the bottom b2 of the inner surface of the bottle B while the electrode 11 and the bottle B are relatively rotated with the opening direction of the bottle B as an axis, a surface treatment with improved uniformity is performed. Can do.

[3. Modified example]
Next, a modified example of the electrode and a modified example of the grounded conductor will be described with reference to the drawings.

(3.1 Modification of electrode shape)
A modification of the shape of the electrode will be described with reference to FIG.

  FIGS. 7A to 7E are schematic views showing modifications of the electrode of FIG.

  As shown in FIG. 7A, the electrode 21 that can pass through the opening b3 of the resin bottle B has a shape in which three or more rod-shaped electrode discharge portions 21a are radially spread from the tip of the electrode column 21b. Good. In the case of the corona discharges C1 and C2, corona discharge is generated from the tip of the rod-shaped electrode discharge portion 21a. In the case of the corona discharge C3 and the discharge C4, corona discharge is generated from the side surface of the rod of the electrode discharge portion 21a toward the bottom portion b2 of the bottle B.

  As shown in FIG. 7B, the electrode 22 that can pass through the opening b3 of the resin bottle B may have a shape in which a rod-shaped electrode discharge portion 22a extends in a T shape from the tip of the electrode support 22b.

  As shown in FIG. 7C, the electrode 23 that can pass through the opening b3 of the resin bottle B may have a shape in which the rod-shaped electrode discharge portion 23a is bent in an L shape from the tip of the electrode support 23b.

  As shown in FIG. 7D, the electrode 24 that can pass through the opening b3 of the resin bottle B is transferred from the rod-shaped electrode column 24b to the rod-shaped electrode discharge portion 24a via the electrode curved portion 24c. It may be bent into an L shape with no corners.

  As shown in FIG. 7E, the electrode 25 that can pass through the opening b3 of the resin bottle B may have a gently curved shape from the electrode support 25b to the electrode discharge portion 25a.

  In order to reform as homogeneously as possible, the electrodes 21, 22, 23, 24 are rotated while relatively rotating the electrodes 21, 22, 23, 24, 25 and the bottle B around the opening direction of the bottle B. , 25 is preferably brought closer to the bottom b2 of the inner surface of the bottle B.

(3.2 Variation of electrode insertion)
Next, in the case of the electrode 24, the operation of inserting the electrode 24 into the bottle B will be described with reference to FIG.

  FIGS. 8A to 8E are schematic views showing modifications of the electrode insertion process. In FIGS. 8A to 8E, the ground portion 12 is omitted.

  As shown in FIG. 8A, in step S3, the drive unit 14 applies the electrode 24 to which the voltage has been applied in step S2 from the tip of the electrode discharge unit 24a of the electrode 24 to the opening b3 of the bottle B. 24 is inserted. At this time, the drive unit 14 rotates the bottle B.

  Next, as shown in FIG. 8B, the driving unit 14 causes the electrode column 23b to move in the direction of the electrode 24 while the tip of the electrode discharge unit 24a passes through the opening b3 of the bottle B. It approaches so that it may become parallel to the opening direction of B. The inner surface of the place that spreads from the opening b3 of the bottle B to the thick part of the body part b1 is modified.

  Next, as shown in FIG. 8C to FIG. 8D, when the direction of the electrode support 24 b becomes parallel to the opening direction of the bottle B, the driving unit 14 moves the electrode 24 to the opening direction of the bottle B. The electrode discharge portion 24a is brought closer to the bottom portion b2 of the inner surface of the bottle B while the inner surface of the body portion b1 of the bottle B is modified by the corona discharge C2.

  Next, as shown in FIG. 8E, in step S4, the drive unit 14 brings the electrode discharge unit 24a closer to the bottom b2 of the inner surface of the bottle B until the discharge mode changes. Corona discharge C3 is generated from the side surface portion of the electrode discharge portion 24a (the surface facing the bottom surface of the conductive portion). Since the electrode 24 and the bottle B rotate relatively, the entire bottom b2 of the inner surface of the bottle B is easily modified.

(3.3 Electrode with deployment mechanism)
Next, an electrode that expands when the tip of the electrode is opened or closed will be described with reference to FIGS. 9 and 10.

  FIGS. 9A to 9C are schematic views showing a modification of the electrode of FIG. 1 and an example of an electrode having a deployment mechanism. FIGS. 10A to 10C are schematic diagrams illustrating an example of a state of corona discharge treatment in the electrode of FIG. 9A. In FIGS. 10A to 10C, the ground portion 12 is omitted.

  As shown in FIG. 9A, the electrode 31 may include a rod-shaped electrode column 31b, two rod-shaped electrode discharge portions 31a, and a hinge portion 31c for expanding the electrode discharge portion 31a. The electrode discharge part 31a opens and closes around the hinge part 31c.

  As shown in FIG. 9B, the electrode 32 may include a rod-shaped electrode support 32b, a single rod-shaped electrode discharge portion 32a, and a hinge portion 32c for expanding the electrode discharge portion 32a.

  As shown in FIG. 9C, the electrode 33 has a rod-shaped electrode support 33b, three or more umbrella-shaped rod-shaped electrode discharge portions 33a, and a hinge portion 33c for expanding the electrode discharge portion 33a. May be.

  When passing through the opening b3 of the bottle B, the driving unit 14 closes the electrode discharge units 31a, 32a, and 33a to the extent that the opening b3 can pass. To close, the electrode discharge parts 31a, 32a, 33a are folded and approach the electrode columns 31b, 32b, 33b, and the electrode discharge parts 31a, 32a, 33a are folded and separated from the electrode columns 31b, 32b, 33b. But there is either.

  The hinge portions 31c, 32c, and 33c (an example of a deployment mechanism that can be deployed after passing through the opening b3 of the bottle B) have a mechanism that can rotate around the hinge portions 31c, 32c, and 33c. For example, a mechanism such as a mechanism that pulls up with a wire and opens the electrode discharge portions 31a, 32a, and 33a by its own weight, a spring mechanism, an umbrella folding method, and the like.

  The electrodes 31, 32, 33 are discharged and pass through the narrow part of the opening b3 of the bottle B while rotating around the electrode columns 31b, 32b, 33b. After passing, the electrodes 31, 32, 33 are developed, and the electrode discharge portions 31a, 32a, 33a are opened. After the electrode discharge portions 31a, 32a, and 33a are opened, the electrodes 31, 32, and 33 are moved to the bottom portion b2 of the bottle B by the driving portion 14 while rotating around the electrode columns 31b, 32b, and 33b.

  In the case of the electrode 31, as shown in FIG. 10A, in step S3, the electrode discharge part 31a is rotated around the electrode column 31b while the electrode discharge part 31a is closed, and the electrode discharge part 31a is opened to the opening b3 of the bottle B. Pass through the narrow part. Corona discharge from the tip of the electrode discharge part 31a modifies the inner part of the opening b3. In addition, the electrode discharge part 31a may be in a slightly opened state so as to approach the inside of the tubular opening b3.

  As shown in FIG. 10B, the electrode discharge portion 31a that generates corona discharge from the tip starts to open while rotating along the inner surface shape of the body portion b1 from the opening portion b3. When the electrode 31 has moved to the position where the inner diameter of the body portion b1 is the maximum, the electrode discharge portion 31a is fully opened. Corona discharge from the tip of the electrode discharge part 31a modifies the inner part of the body part b1. In addition, when the body part b1 has a constricted shape, the electrode discharge part 31a may be somewhat closed.

  As shown in FIG. 10C, when the opened electrode discharge portion 31a approaches the bottom portion b2 in step S4, corona discharge is generated from the rod portion of the electrode discharge portion 31a. The bottom b2 of the inner surface of the bottle B is modified while the electrode discharge part 31a rotates.

  When the electrodes 31, 32, and 33 have a deployment mechanism that can be deployed after passing through the opening b3 of the bottle B, the tips of the electrodes (electrode discharge portions 31a, 32a, and 33a) pass through the opening b3 of the bottle B. Since the electrode discharge parts 31a, 32a, 33a are opened and approach the side wall parts of the inner surface of the bottle B (the inner side of the opening b3 and the inner side of the body part b1), the side wall part of the inner surface of the bottle B is efficiently modified. Can do.

(3.4 Modification of conductor)
Next, a modified example of the conductor will be described with reference to FIG.

  FIG. 11 is a schematic view showing a modification of the grounded conductor.

  As shown in FIG. 11, the ground part 42 (an example of a grounded conductor) may be only a grounded conductor without an insulating part. In this case, the bottle B is set so that the bottle B does not contact the ground portion 42 of the conductor. Further, the opening b3 of the bottle B slightly protrudes from the opening of the ground part 42. And the effect equivalent to having an insulation part can be acquired by further opening the space | interval of the bottle B and the earth part 42. FIG.

  In addition, the surface treatment apparatus 10 for bottles does not need to have the grounding part 12. By changing the electrical characteristics and electrode shape of the electrode 11, the bottle surface treatment apparatus 10 can efficiently perform the surface treatment even in a state where the grounded earth portion 12 is not provided.

  Furthermore, the present invention is not limited to the above embodiments. Each of the embodiments described above is an exemplification, and any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and has the same operational effects can be used. It is included in the technical scope of the present invention.

10: Surface treatment apparatus for bottles 11, 21, 22, 23, 24, 25, 31, 32, 33: Electrodes 11a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a: Electrode discharge parts 12, 42 : Grounding part (an example of a grounded conductor)
12a: Conductive part (an example of a grounded conductor)
12b: Insulating part 13: Power supply part 14, 15: Drive part (drive means)
16: Control part B: Bottle b2: Bottom part b3: Opening part C1, C2, C3: Corona discharge C4: Discharge

Claims (5)

In the bottle surface treatment device that modifies the inner surface of the resin bottle by corona discharge,
An electrode capable of passing through the opening of the bottle;
Passing an electrode to which a voltage generating the corona discharge is applied, through the opening of the bottle;
Driving means for bringing the inner surface of the bottle closer to the bottom until the aspect of the corona discharge changes for processing the bottom of the inner surface of the bottle;
Equipped with a,
At least a part of the outside of the bottle has a grounded conductor, and an insulator between the bottle and the conductor,
It said insulator, bottle surface treatment apparatus which is characterized that you have to protrude from the conductive to the opening direction of the bottle. In the surface treatment apparatus for bottles of Claim 1,
The bottle surface treatment apparatus, wherein the electrode further brings the electrode closer to the bottom of the inner surface of the bottle until the driving means generates a discharge along the bottom of the inner surface of the bottle. In the surface treatment apparatus for bottles according to claim 1 or 2,
The bottle surface treatment apparatus, wherein the electrode has a deployment mechanism that can be deployed after passing through the opening of the bottle. In the surface treatment apparatus for bottles according to any one of claims 1 to 3,
The bottle surface treatment apparatus characterized in that the driving means brings the electrode closer to the bottom of the inner surface of the bottle while relatively rotating the electrode and the bottle about the opening direction of the bottle. In the bottle surface treatment method of the bottle surface treatment apparatus for modifying the inner surface of the resin bottle by corona discharge,
A voltage application step of applying a voltage at which the corona discharge is generated to an electrode capable of passing through the opening of the bottle;
An insertion step of inserting the electrode to which the voltage is applied into the bottle through the opening of the bottle;
A bottom processing step for bringing the electrode closer to the bottom of the inner surface of the bottle until the aspect of corona discharge from the electrode changes for processing of the bottom of the inner surface of the bottle;
Including
The bottle surface treatment apparatus has a grounded conductor at least at a part of the outside of the bottle, and an insulator between the bottle and the conductor, and the insulator is formed on the bottle. bottles for surface treatment wherein that you have to protrude from the conductive to the opening direction.

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