JPS62131500A - Charge elimination - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for removing static electricity from a sheet-like material such as a strip (also referred to as a "web") or a sheet-like material, and more specifically relates to a method for removing static electricity from a sheet-like material such as a strip-like material (also referred to as a "web") or a sheet-like material, and more specifically, from a photographic material or a magnetic material. The present invention relates to a method for eliminating static electricity during the manufacturing process, processing process, or utilization process of recording materials such as pressure-sensitive recording materials and heat-sensitive recording materials, and their supports.

[Prior art]

Recently, the speed of manufacturing processes, processing processes, and handling of finished product sheets for various plastic sheets has increased, and static electricity is more likely to be generated. It is well known that this static electricity causes various problems in each process. When the amount of the generated band M charge increases and exceeds a certain value, spark discharge will occur between the sheet and the transport roll or other object. When such a discharge phenomenon occurs, an explosion is induced in an atmosphere of a flammable solvent, which is extremely dangerous, and secondary disasters such as personal injury are likely to occur, posing an extremely serious problem. Particularly in the coating and drying processes of photographic emulsions in the production of photographic light-sensitive materials, this discharge failure appears as a failure called a static mark after the development process.
The problem was that it could not be considered a product.

Also, Tokukai Akira! As seen in the ≠-yo≠020 publication and the like, when a photographic hydrophilic colloid liquid is applied to a charged support, coating unevenness occurs depending on the uneven charge. Furthermore, it goes without saying that electrification is a cause of dust adhesion in all processes.

Conventional methods to prevent failures caused by such charging include installing metal brushes or metal moldings near the transport roll to remove charges from the film, or using a corona discharge static eliminator that uses corona discharge to remove positive and negative charges. A method using a radioisotope static eliminator that generates ions and thereby removes the charge on the film, or a method using a radioisotope static eliminator that utilizes the ionization of air by radiation from a radiointobe, or a method of applying a conductive liquid to the surface of these sheets, etc. How to do it, and recently the above-mentioned Tokukai Sho≠-! As seen in Japanese Patent No. ≠020, methods for eliminating static electricity by heat-treating the support have also been developed.

Tokukai Akira! The method disclosed in Patent Publication No. 020 includes a method in which a heating zone is provided in the transport path of the support prior to coating, and a method in which hot air is blown onto the support to heat it, an infrared heating zone, or a microwave heating oven is provided. A wide variety of methods are included, such as a method of heating by radiation or induction through a sheet-like object, a method of heating a conveyor roll in contact with the sheet-like object by electric heat, or a method of heating it by passing hot air or steam. be done.

On the other hand, Tokukai Showa 6? -'? ! In ≠No. 12, Applicant Oil discloses a static elimination method characterized by scanning the surface of a plastic sheet or plastic web with a laser beam to remove the electrical charge on the plastic sheet or plastic web. .

[Problem that the invention seeks to solve]

However, methods using metal brushes and metal molds do not have a sufficient static elimination effect and often cause discharge, while methods using corona discharge static eliminators cause fogging in the production of photographic light-sensitive materials and are not suitable for general use. Moreover, since the method using a radioisotope static eliminator uses radiation, it is not only difficult to handle, but also requires a large amount of money for incidental equipment. The method of applying a synthetic liquid not only increases the drying load but also creates a new problem in that it tends to cause uneven drying.

All of the methods disclosed in Japanese Patent Application Laid-open No. 01-010002 require a large heating zone, and therefore installation is often difficult in limited space manufacturing machines. Furthermore, in these heat treatment methods, the temperature of not only the surface but also the entire sheet-like object increases in the heating zone, causing it to become soft and deformed. This type of static elimination method requires a cooling zone in addition to the heating zone, creating a double load on equipment.

On the other hand, Tokukai Akira! Even in the static elimination method described in Publication Day F3≠r2, the burden on equipment is not improved.

It is an object of the present invention to compensate for the drawbacks of these conventional techniques and to provide an efficient static elimination method using simple equipment.

[Means for solving problems]

The above-mentioned object of the present invention is to have a surface in contact with a sheet-like object to be conveyed a material that is positively charged due to frictional electrification with the sheet-like object, and a material that is negatively charged, in the direction of conveyance of the sheet-like object. This is achieved by a static elimination method characterized by conveying the sheet-like material by means of conveying tools that are alternately combined.

In the present invention, a material that is positively charged due to frictional electrification with a sheet-like object means a material that is positively charged, focusing on the charging series of the sheet-like object, and a material that is negatively charged is Focusing on the electrification series of sheet-like materials, it means something that is negatively charged.

For example, when the sheet-like material is a photographic light-sensitive material, positively charged materials such as Teflon (registered trademark), vinyl chloride, nylon, Delrin, styrene, ceramics, and wood, as well as other positively charged materials, are used. As the negatively charged material, negatively charged materials such as stainless steel, aluminum, titanium, copper, iron, and tin are used.

Next, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, the sheet-like object to be conveyed/ is a material λ whose contact surface with the sheet-like object/ is positively charged due to frictional electrification with the sheet-like object, and the material 3 which is negatively charged. The material is conveyed by a conveying tool ≠ that is combined in the conveying direction of the object, and the surface that comes into contact with the sheet-like object becomes negatively charged, unlike materials that are positively charged due to frictional electrification with the sheet-like object. The material 2 is conveyed by other conveyors 7, 7 formed by combining the sheet-like material 2 in the conveyance direction, and is subjected to a static eliminating action.

In FIG. 2, the sheet conveyance table used in the present invention≠ has a contact surface with the sheet conveyed
It is formed by alternately combining a material λ that is charged with a positive charge due to frictional electrification with a material λ and a material 3 that is charged with a negative charge in the conveying direction of the sheet-like material shown by the arrow.

In order to manufacture such a sheet-like object conveying table≠, grooves parallel to the direction perpendicular to the conveying direction are dug in the conveying table made in advance from Material 3, so that it has a shape as shown in Fig. 3. The cut materials are inserted alternately into these grooves and fixed with adhesive.

The interval between the alternating combinations of the material 3, which is positively charged due to frictional electrification with the sheet-like object to be conveyed, and the material 3, which is negatively charged, is determined by the material of the sheet-like object to be conveyed/and the material λ・3, and the sheet. This will be determined empirically depending on the conveyance speed of the sheet-like article, but for example, the moisture content t of the sheet-like article to be conveyed will be determined empirically.
, j% or less paper, material 1 is Tear 0 (registered trademark name), and material 3 is stainless steel, the appropriate distance is 1 m at the conveyance speed A Om 7 minutes, and 2 pots at the interval at the conveyance speed 200 m/min. .

Further, in these cases, if the thickness of the material is ≠n or less, the effect will be weak. In FIG. 1, the upper surface of the sheet material conveyor is uneven to reduce the contact area with the sheet material.

However, the outer shape and dimensions of the sheet conveyance table can be selected from a wide range. In addition, in Fig. 2, the contact surface between the sheet-like object l and the conveyance table≠ is one side, and the entire width direction of the sheet-like object is the contact surface, but the contact surface may be both sides, or Even a part of the direction, for example, both sides, has the effect of eliminating static electricity.

In Fig. 1, the roller 7 for conveying a sheet-like object used in the present invention has a surface in contact with a sheet-like object to be conveyed, which has a negative charge, unlike a material that is positively charged due to frictional electrification with the sheet-like object 1. The sheet material 6 is formed by alternately combining materials 6 having a tinge of color in the direction of conveyance of the sheet-like material indicated by the arrow.

To manufacture such a sheet-like material conveying roller 7, grooves parallel to the longitudinal direction are dug in a pass roller made in advance from material 2, and the material is cut into the shape shown in FIG. 5! After inserting them alternately into these grooves and fixing them with adhesive, attach the shafts at both ends. A retaining ring? Fit and secure.

The interval between the alternating combinations of the material that is positively charged and the material 6 that is negatively charged due to frictional electrification with the sheet-like object to be conveyed is determined by the material of the sheet-like object to be conveyed/and material j, A, and the sheet. This will depend on the conveyance speed and K of the sheet-like article, and will be determined empirically, but for example, if the conveyed sheet-like article l has a moisture content
, j% or less, when the material 2 is Teflon (registered trademark) and the material t is stainless steel, the appropriate spacing is J'l 1 m when the conveying speed A is 0 m 1 minute, and the interval 2 is appropriate when the conveying speed is 200 m 7 minutes.

In the present invention, dimensions such as the outer diameter and length of the sheet conveying roller 7 can be selected from a wide range. Also, in Figure 7,
The contact surface between the sheet material/and the conveyance roller 7 is on one side,
Although the entire widthwise surface of the sheet-like material is the contact surface, the contact surface may be both surfaces, or a part of the widthwise direction, for example, both sides, has the effect of eliminating static electricity.

In the present invention, the support material for the sheet to be conveyed includes paper, plastic film, resin coated paper,
Includes synthetic paper, etc. Materials for the plastic film include, for example, polyolefins such as polyethylene and polypropylene, vinyl polymers such as polyvinyl acetate, polyvinyl chloride, and polystyrene; 4. Polyamides such as J-nylon and Otsu-nylon, polyesters such as polyethylene terephthalate, polyethylene-J and J-su7talate, polycarbonates, cellulose acetates such as cellulose triacetate and cellulose diacetate, and the like are used. Further, the resin used for resin coated paper is typically polyolefin such as polyethylene, but is not necessarily limited thereto.

[Effect]

When conveying a sheet-like object according to the present invention, the polarity of the charge that occurs when the sheet-like object and the surface of the conveyor come into contact with each other and separate from each other changes alternately, so that they are substantially canceled out and the static electricity is removed. .

〔Example〕

In Figures 2 and 3, aluminum is used as material 2 and soft vinyl chloride is used as material 3, the interval between alternate combinations is 1 m, effective width (dimension W)≠00Il, length dimension L in the sheet conveyance direction) 2001II+ , total thickness/j1m+, thickness of material λ, height dimension of convex part h)
-We produced a 2m long white ginseng.

Next, in Figures ≠ to 6, material is Teflon (registered trademark), material 6 is stainless steel (5US-
3044) using the alternate combination spacing Jrin, outer diameter! jtm, λ conveyor rollers 7 with an effective length of 00 m were manufactured.

With these conveyors, the width is 3 and the length is 4 as shown in Figure 1.
! Ojtm paper (surface resistance is 10-14 in LogSR value)
~10-15) was transported in 60 m/min, and was similarly transported using a transport platform of the same size made only of soft vinyl chloride and 22 rows of the same size made only of stainless steel (SUS304A).

Compared to the case, the band [i decreased to '/r due to the static elimination effect.

[Effects] By eliminating static electricity from a sheet-like object according to the present invention, static electricity can be easily and efficiently removed even during high-speed conveyance and when the surface resistance of the conveyed object is large, making it possible to suppress the occurrence of static electricity. , static electricity damage is drastically reduced.

Furthermore, the durability of the equipment is improved, and cleaning and maintenance work can be simplified.

The present invention is not limited to the embodiments and examples and can be widely applied.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the static elimination method according to the present invention. FIG. 2 is a perspective view showing an example of a carrier used in the present invention, and FIG. 3 is a perspective view of its parts. FIG. 5 is a perspective view showing another example of the carrier used in the present invention, FIG. 5 is a perspective view of its parts, and FIG. 2 is an enlarged side view of the carrier shown in FIG. l... Sheet-like material λ, j... Material that takes on a positive charge due to frictional electrification 3.6... Material that takes on a negative charge due to frictional electrification Hiroshi, 7... ...Transportation equipment?・・・・・・Shaft portion・・・・Retaining ring

Claims (1)

[Claims] The surface of the contact surface with the sheet-like object to be conveyed is formed by a conveying device in which a material that is positively charged due to frictional electrification with the sheet-like object and a material that is negatively charged are alternately combined in the conveying direction of the sheet-like object. A static elimination method characterized by conveying the sheet-like material.