JP2002224558A - Corona discharge treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corona discharge treatment apparatus whereby parts not subjected to corona discharge treatment can be left in subjecting the surface of a belt-like substrate of a plastic film, paper, a nonwoven fabric, or the like to a corona discharge treatment. SOLUTION: In a corona discharge treatment apparatus wherein a belt-like substrate 4 is traveled through the gap between a discharge electrode 2 and a counter electrode 3 to subject the surface of the substrate 4 to a corona discharge treatment, an isolation means 7 that forms parts not subjected to a corona discharge treatment by isolating a corona discharge from the substrate 4 by interposing a shielding member 5 between the electrode 2 and the substrate 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a corona discharge-untreated portion on the surface of a strip-shaped object such as a plastic film, paper, woven fabric or non-woven fabric. The present invention relates to a corona discharge treatment device that can be used.

[0002]

2. Description of the Related Art Plastic films, papers, woven fabrics and non-woven fabrics are widely used for various purposes. Among them, plastics have excellent physical properties such as processability, chemical resistance, mechanical strength and transparency. Film, sheet,
Widely used as various molded articles such as containers.

However, plastic films,
The surface of paper, woven fabric and non-woven fabric is relatively chemically stable, and especially the surface of plastic is free of oxidizing (corrosive) organic compounds, is hydrophobic, and has excellent chemical stability. I have. Therefore, it has low affinity for inks, adhesives, paints, and the like, and is not suitable for adhesion or printing. Then, in order to improve these, the surface of the film is processed by corona discharge treatment.

[0004] Corona discharge treatment is performed by applying a high frequency and a high voltage between a high voltage electrode and a metal processing roll (counter electrode) to generate a high pressure corona, pass the film through the corona, and cause the film surface to pass through. The surface is made hydrophilic by reacting ozone and nitric oxide, which have generated corona. In this way, bonding and printing can be performed by chemically and physically forming an oxide film to modify the surface.

[0005]

However, when the corona discharge treatment is performed, the compounding agent in the objects to be transferred migrates to the surface, and as a result, the strength of the heat welding between the objects to be processed is reduced.
The strength of heat sealing when forming a packaging bag is weakened.

Therefore, conventionally, the portion of the object to be heat-sealed is not subjected to the corona discharge treatment. As this method, there is a method of temporarily stopping corona discharge from a discharge electrode in a process of carrying a corona discharge treatment by transporting an object between a discharge electrode and a processing roll. However, it takes a long time to stop and restart the discharge, and the portion not subjected to the corona discharge treatment (corona discharge untreated portion) becomes longer than desired, so that the corona discharge untreated portion can be freely formed. Can not do it.

Further, a plurality of projections are formed on the discharge electrode,
There is a method of performing corona discharge treatment partially by performing corona discharge only from this convex part. However, the discharge generated from the convex part is disturbed before reaching the workpiece, and corona discharge It is not possible to clarify the boundary between the treated part (corona discharge treated part) and the corona discharge untreated part. Therefore, it is necessary to increase the distance between the corona discharge processing sections or the corona discharge non-processing sections to some extent, so that it is not possible to make detailed settings.

In addition, a groove is formed on the processing roll,
There is a method of partially arranging an insulating layer on the counter electrode so that even if corona discharge is oscillated from the discharge electrode, the object to be processed is not partially subjected to corona discharge treatment. Similarly to the above, the boundary between the corona-discharge treated portion and the corona-discharge-untreated portion is not clear due to disturbance of the high voltage current from the discharge electrode, and fine setting cannot be performed.

Accordingly, the present invention provides a corona discharge treatment apparatus which can clearly distinguish the boundary between a corona discharge treatment section and a corona discharge untreated section and can freely form a corona discharge treatment section. The purpose is to do.

[0010]

In order to solve the above-mentioned problems, the present invention relates to a method of transporting a band-shaped object such as a plastic film, paper, woven cloth and non-woven cloth between a discharge electrode and a counter electrode. In a corona discharge treatment apparatus for performing corona discharge treatment on the surface of an object to be treated, a shielding member is interposed between a discharge electrode and the object to be treated, and an interruption means for interrupting corona discharge is provided. By interposing a shielding member between the discharge electrode and the object to be processed, corona discharge in the interposed portion can be cut off, so that a corona discharge unprocessed portion is partially formed in the object to be processed. Can be. When the untreated portion of the corona discharge is formed so as to correspond to a portion that needs to be heat-sealed (in the case of a bag, a side portion, a town portion, a bottom portion, and the like), the strength of the heat seal is reduced. It is possible to manufacture a high-priced bag or the like.

The shielding means supports a shielding member, one or more of the shielding members, and a rotatable shielding member mounting plate for rotating these around the discharge electrode. And rotation driving means for causing the rotation. The shielding member has a rod shape or a plate shape using a non-conductive member, and is fixed to a shielding member mounting board with a screw or the like.

When the shielding member mounting plate with the shielding member is rotated by the rotation driving means, the corona discharge is interrupted only when the shielding member is interposed between the discharge electrode and the object to be processed. Corona discharge untreated portions can be formed at predetermined intervals.

If a plurality of screw holes for mounting the shielding member are formed on the shielding member mounting plate, the mounting position can be changed on the surface of the shielding member mounting plate. A plurality can be attached. By changing the mounting position of the shielding member, it is possible to change the position of the corona discharge unprocessed portion formed on the workpiece, and
By providing a plurality of shielding members and changing the interval between the shielding members, the interval between the untreated portions of the corona discharge can be changed. Further, by deforming the shielding member into various shapes, the shape, size, and the like of the corona discharge processing target portion can be freely changed.

When the untreated portion of the corona discharge is formed, if the shielding member is brought into contact with the object to be treated, the corona discharge is reliably interrupted, and the untreated portion of the corona discharge having a predetermined width and size can be formed. Therefore, the boundary between the corona-discharge treated part and the corona-discharge-untreated part can be clearly distinguished, and the accuracy can be improved. Settings can be set.

[0015] Corona discharge treatment is performed on the bag-shaped article to be heat-sealed while leaving a portion to be heat-sealed, and the corona discharge-treated portion is printed. Then, the untreated portion of the corona discharge is heat-sealed to remove the bag. In the manufacturing method, before the corona discharge treatment, a mark for identifying the corona discharge treated portion and the corona discharge untreated portion is printed, and the mark is used as a mark, so that the corona discharge treatment is performed while leaving a portion to be heat-sealed. Since the portion to be heat-sealed is not subjected to the corona discharge treatment, the strength of the heat seal can be maintained and the durability as a bag is improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the present corona discharge treatment apparatus 1 transports a band-shaped workpiece 4 between a discharge electrode 2 and a counter electrode (processing roll) 3, and performs corona discharge treatment on the surface of the workpiece 4. In the corona discharge treatment device 1
The shielding member 5 is interposed between the discharge electrode 2 and the workpiece 4 to interrupt corona discharge, and the workpiece 4 is provided with a blocking means 7 for forming a corona discharge unprocessed portion 6.

The structure is such that a plate-shaped discharge electrode 2 supported on a support shaft 8, a metal processing roll 3 positioned below the discharge electrode 2 and rotated by a rotary drive motor (not shown),
It comprises a high-frequency high-voltage generator (not shown) for supplying a high-frequency high voltage to the discharge electrode 2, and a cutoff means 7. The form of the discharge electrode and the counter electrode is not limited.

The shielding means 7 includes a shielding member 5 and a shielding member 5.
And a rotation driving means 10 for rotating the shield plate mounting plate 9 rotatably mounted on the support shaft 8 of the discharge electrode 2, and a shield plate mounting plate By rotating 9, untreated portions 6 of corona discharge are formed on the workpiece 4 at predetermined intervals. The shielding member 5 is prepared in a rod shape or a plate shape having various thicknesses and lengths, a plurality of screw holes 11 are formed in the shielding plate mounting plate 9, and the shielding member 5 is fitted to the shielding plate mounting plate 9. And fix it.

The shielding plate mounting plate 9 is a non-conductive disk-shaped plate having a hole at the center. A bearing 12 is fitted into this hole, and the support shaft 8 of the discharge electrode 2 is passed through the hole of the bearing 12. Thereby, it is rotatably arranged on one side or both sides of the discharge electrode 2.

The rotation driving means 10 uses the rotation force of the processing roll 3. The rotary drive pulley 13 is fixed to the shaft of the processing roll 3, and the bearing 1 of the shield plate mounting plate 9 is fixed.
2, the driven pulley 14 is fixed, and the timing belt 15 is wound around the rotary drive pulley 13 and the driven pulley 14 in an intersecting manner. According to this configuration, the rotational force of the processing roll 3 generated by the rotary drive motor is transmitted to the driven pulley 14 via the rotary drive pulley 13 and the timing belt 15 to rotate the shield plate mounting board 9.

In the corona discharge treatment apparatus 1 constructed as described above, at the time of use, the object 4 is conveyed, and at the same time, the high-frequency high voltage supplied from the high-frequency high-voltage generator is applied to the discharge electrode via the conductor. 2, discharge is performed from the discharge electrode 2 to the processing roll 3, and the object 4 is subjected to corona discharge processing. At the same time, when the shield plate mounting board 9 on which the plurality of shield members 5 are mounted is rotated by the above-described rotating mechanism, and the shield member 5 is interposed between the discharge electrode 2 and the workpiece 4, the portion is subjected to corona discharge treatment. Is not performed, and the corona discharge unprocessed portions 6 can be formed at predetermined intervals. At this time, if the shielding member 5 is set so as to be in contact with the workpiece 4, the corona discharge can be completely cut off.

The untreated portion 6 of the corona discharge can be formed in any shape according to the number and shape of the shielding members 5 fixed to the shielding plate mounting board 9. For example, if a long rod or plate-shaped shielding member is used, the corona discharge unprocessed portion 6 can be formed as shown in FIG. 3A, and if a short rod or plate-shaped shielding member is used, as shown in FIG. As shown in FIG. 3B, the corona discharge untreated portion 6 can be formed only at the end, and if a plate-shaped shielding member along the circular shape of the outer edge of the shielding plate mounting plate 9 is used, FIG.
As shown in (c), the end portion is continuously treated with the untreated portion 6 of the corona discharge.
Can be Also, by combining these,
It is also possible to form a corona discharge untreated portion 6 as shown in FIG. Reference numeral 16 in the drawing indicates a corona discharge processing unit.

In the printing process, a mark is printed by a mark printing device, and in the next printing process, the mark is read by a mark reading device to recognize the position of a portion to be printed, and printing is performed so that the portion is printed. It is common to control the device. Therefore, as shown in FIG. 1, the present corona discharge processing device 1 is interposed in this printing process, and the mark printing device 17 is interlocked with the shielding member 5 of the present corona discharge processing device 1, so that the corona discharge processing portion 16 or the corona discharge When the mark printing is performed on the discharge-unprocessed portion 6, it is possible to control the mark reading device 18 to read the mark-printed portion in the next printing process and to perform printing only on the corona discharge processing portion. .

In order to link the mark printing device 17 with the shielding member 5 of the corona discharge treatment device 1, the mark is printed such that the mark is printed in accordance with the interval at which the shielding member 5 of the corona discharge treatment device 1 blocks corona discharge. The printing device 17 may be controlled. In such a configuration, when a mark is printed on the corona discharge processing unit 16, the control is performed so that printing is performed on the mark printing portion in the next printing process, and the mark is printed on the corona discharge unprocessed unit 16. In such a case, control may be performed so that printing is performed on a portion other than the mark printing portion in the next printing step. In the above embodiment, the mark printing device 17 and the shielding member 5 of the corona discharge treatment device 1 are used.
However, the mark reading device may be interposed between the mark printing device 17 and the corona discharge processing device 1, and the mark reading device and the shielding member 5 of the present corona discharge processing device 1 may be linked. That is, the mark printing portion of the mark printing device 17 is read by a mark reading device interposed between the mark printing device 17 and the corona discharge processing device 1, and the mark printing portion is read by the corona discharge processing section 16 or the corona discharge unprocessed portion. What is necessary is just to control the blocking member 5 so that it may become the part 6. The mark by the mark printing device 17 may be printed on the boundary between the unprocessed corona discharge section 6 and the corona discharge processing section 16.

Also, without using a mark printing device, the ink may come out of the shielding member 5 itself so that the mark can be printed simultaneously with contacting the workpiece 4 when the corona discharge is cut off. That is, since the portion on which the mark is printed is the unprocessed portion of the corona discharge 6, the mark printed portion is read by the mark reading device 18 in the next printing step, and
The printing devices 19 and 2 are configured to perform printing on portions other than the marked portions.
0 and 21 may be controlled.

The ink used for printing the mark may be any ink that can be printed without performing a corona discharge treatment, and the printed state may be visible or invisible. If a visible ink is used for printing a mark on the corona discharge processing section 16, it is possible to obtain a product in which the corona discharge unprocessed section 6 is also printed, and the appearance is excellent.

Printing of the workpiece 4 on the corona discharge processing section 16 by the printing devices 19, 20, and 21 is performed on the entire surface of the corona discharge processing section 16, so that the corona discharge processing 16 and the corona discharge unprocessed section 6 are performed. The boundary between the corona discharge treatment device 1 and the corona discharge-untreated portion 6, that is, the heat-sealable portion can be visually confirmed, and the practicality of the corona discharge treatment device 1 can be improved. In the drawing, reference numeral 19 denotes a first-color printing device, 20 denotes a second-color printing device, 21 denotes a third-color printing device, a denotes corona discharge, and an arrow indicates a transport direction of the workpiece. In addition, in the figure, only the third color printing device is described, and it is a multicolor printing of three colors,
Multi-color printing of four or more colors may be used.

The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, in the above-described embodiment, the shielding plate mounting plate 9 is constantly rotated, but the shielding members 5 of various lengths are fixed to the shielding plate mounting plate 9 so as to be rotatable about the axis, and the shielding plate mounting plate 9 is required. You may make it rotate only at the time. According to this configuration, if the shielding member 5 is always interposed between the discharge electrode 2 and the object to be processed, a corona discharge unprocessed portion is continuously formed by a predetermined width from the side of the object to be processed 4. At this time, since the shielding member itself is rotatable about the axis, no friction occurs at the contact point with the workpiece 4. When the shielding member mounting plate is rotated to interpose a shielding member having a different length between the discharge electrode 2 and the workpiece, the width of the corona discharge unprocessed portion can be changed.

[0029]

As is apparent from the above description, according to the present invention, in order to solve the above-mentioned problems, a corona discharge is cut off by interposing a shielding member between the discharge electrode and the object to be processed, and Since the interruption means for forming the untreated portion of the corona discharge is provided on the object, the untreated portion of the corona discharge can be partially formed on the object to be treated.

Since the shielding means rotates the shielding member mounting plate on which the shielding member is mounted by the rotation driving means, it is possible to form untreated portions of corona discharge at predetermined intervals on the object to be processed. Since the rotation of the processing roll is used for the rotation driving unit, power consumption can be reduced.

A plurality of shielding members can be mounted on the surface of the shielding member mounting board, and the mounting position thereof can be changed. Therefore, a plurality of shielding members are provided to change the interval, and various shielding members are provided. Or the like, the shape, size, width, etc. of the untreated portion of the corona discharge can be freely changed.

At the time of forming the untreated portion of the corona discharge, if the shielding member is brought into contact with the object to be treated, the corona discharge is surely interrupted, and the boundary between the untreated portion of the corona discharge and the treated portion of the corona discharge is clearly distinguished. And its accuracy can be increased. Therefore, it is possible to make fine settings such as setting the interval between the untreated portions of the corona discharge or the intervals between the treated portions of the corona discharge to be small.

[Brief description of the drawings]

FIG. 1 is a diagram showing a printing process in which the present corona discharge treatment device is interposed.

FIG. 2 is a perspective view of a main part of the corona discharge treatment apparatus.

FIG. 3 is a plan view of an object to be subjected to a corona discharge treatment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corona discharge processing apparatus 2 Discharge electrode 3 Processing roll 4 Workpiece 5 Shielding member 6 Corona discharge unprocessed part 7 Blocking means 9 Shielding member mounting board 10 Rotation driving means 16 Corona discharge processing part 17 Mark printing device 18 Mark reading device

Claims (5)

[Claims] 1. A corona discharge treatment apparatus for conveying a band-shaped object between a discharge electrode and a counter electrode and performing corona discharge treatment on the surface of the object. A corona discharge treatment apparatus provided with a blocking means for intercepting a corona discharge with a shielding member interposed therebetween, and partially forming an untreated portion of the corona discharge in an object to be processed. 2. The shielding means, a shielding member, a shielding member mounting plate supporting one or a plurality of the shielding members, and being rotatable so that these can rotate around the discharge electrode; 2. The corona discharge treatment device according to claim 1, further comprising: a rotation drive unit for rotating the attachment plate, wherein the unshielded portion of the corona discharge is partially formed at predetermined intervals on the workpiece by rotating the shield member attachment plate. 3. The corona discharge treatment apparatus according to claim 2, wherein said shielding member is mounted on a surface of said shielding member mounting board so that its mounting position can be changed. 4. The corona discharge treatment apparatus according to claim 1, wherein said blocking means contacts said shielding member with a surface of an object to be treated when forming an untreated portion of corona discharge. 5. A corona discharge treatment is performed on a band-shaped workpiece for bag keeping while leaving a portion to be heat-sealed, and printing is performed on the corona discharge-treated portion. In a method of manufacturing a bag, a mark for identifying a corona-discharge-treated portion and a corona-discharge-untreated portion is printed before corona discharge treatment, and the mark is used as a mark to perform a corona discharge treatment while leaving a portion to be heat-sealed. Manufacturing method.