JPS59210951A - Method for preventing long strip film from being broken - Google Patents

Abstract

PURPOSE:To prevent a film from being broken by inhibiting the adherence of edges of the film to each other, by applying an anti-sticking agent to both edges of a long strip, hygroscopic plastic film and then metallizing the surface of the film under vacuum while winding up it. CONSTITUTION:In metallizing a long strip film having a thickness of 4mum or below and composed of a hygroscopic plastic comprising unwinding the film wound into a roll and metallizing the surface of the film under vacuum while winding up it, an anti-sticking agent is previously applied to both edges of the long strip film. Since a thin film of 4mum or below in thickness is prepared from a hygroscopic film such as a polyester or a polycarbonate film, the edges of the film wound into a roll adhere to each other in some places so that when the roll is unwound from an unwinding roll, the edges are marred. Examples of the anti- sticking agents are silicone resin, fluororesin, stearate salt, wax, rosin ester, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing breakage of a long strip film when metal is vacuum-deposited on the surface of the long strip film.

Metal-deposited film for capacitors is manufactured by vacuum-depositing a metal such as aluminum or zinc to serve as an electrode on the surface of a dielectric glass film, and the metal-deposited film 2 is cut into narrow widths of required dimensions. The capacitors are stacked one on top of the other and wound to form a so-called wound capacitor. Usually, vacuum evaporation is carried out in a vapor deposition system that is separated into a deposition chamber with an evaporation source and a winding chamber where the long strip of film is unwound and wound. The metal from the evaporation source is deposited onto the film by passing through a deposition chamber.

Recently, wound-wound capacitors have become smaller, and for this reason, very thin dielectric plastic films with a thickness of 4 μm or less are used, and especially for extremely small capacitors, a film with a thickness of about 1.5 to 3 μm is used. It is required to use an ultra-thin film. Such thin plastic films are generally made from polyester films such as polyethylene terephthalate, unsaturated polyesters, or polycarbonate films.

When performing vacuum deposition using the conventional method on a thin plastic film having a thickness of 4 μm or less as described above, a new problem arises that does not exist in the case of a relatively thick film. That is, a long strip of thin plastic film is unwound from an unwinding roll in a vacuum tank, passes through a guide roller, and passes over a cooling can for metal deposition.
When it is wound up on the take-up roll after passing through the guide roller,
The film often breaks at some point. If the film were to break during vacuum deposition, the operation would of course have to be stopped. Since the vapor deposition process itself is a batch method, the time loss is considerable, and in addition, the length of the part that can be manufactured into a product is odd, resulting in a large loss. Furthermore, since the cooling can is exposed to an evaporation source when the film is broken, metal is deposited on the cooling can and the cooling can becomes dirty, requiring cleaning and wasting the metal in the crucible. Furthermore, when performing metal vapor deposition on film, masking is performed with endless tape in order to partially create non-evaporated areas, but the broken and miscoiled film gets tangled with the endless tape, causing the endless tape to shift and cause all In many cases, the tape cannot be reused, resulting in large losses.

In this way, if the film breaks during vacuum evaporation, it will result in a loss of raw materials and products, and it will also result in significant operational losses because several batches of processing are required for one film. .

The above-mentioned film breakage occurs as a particular problem when unwinding and winding a hygroscopic plastic film having a thickness of 4 μm or less in a vacuum.

It often happens that materials that do not break during unwinding or winding in the atmosphere easily break when unwinding or winding is performed in a vacuum. This is because air is trapped between the roller and film in the atmosphere, making it easier for the roller to slide against the film, and the vacuum is used to alleviate local tension on the film. This is thought to be because the rollers do not easily slip on the film inside, so there is no local tension relaxation, so if there are some scratches on the edges of the film, it is likely to break.

Thin films with a thickness of 4 μm or less are manufactured from hygroscopic films such as polyesters such as polyethylene terephthalate and polycarbonate, so the ends of the rolls are exposed to moisture in the air, worker sweat, etc. When this occurs, the ends of the rolled film stick together in places, causing scratches on the ends when the film is unwound from the unwinding roll, which is the biggest cause of film breakage. It has been found. In addition, in the case of a thick film of 5 μm or more, such adhesion hardly leads to breakage.

If this film edge is prevented from sticking, the thickness can be reduced to 4
The inventor's research has found that even when a metal is vacuum-deposited onto a thin film of micrometers or less, the film is prevented from breaking. The present invention is based on such knowledge,
This was done for the purpose of eliminating adhesion at the edges of the film and preventing the film from breaking when performing vacuum vapor deposition of metal on a thin hygroscopic plastic film with a thickness of 4 μm or less.

The present invention unwinds a long strip film made of hygroscopic plastic wound into a roll and has a thickness of 4 μm or less, and when vacuum-depositing a metal onto the surface of the film while winding it up, both ends of the long strip film are used. The present invention relates to a method for preventing breakage of a long strip film during vacuum deposition, which comprises applying an anti-sticking agent to the film in advance.

In the present invention, the anti-sticking agent previously applied to both ends of the long strip-shaped film is one that can prevent the ends of the film wound into a roll from sticking due to the action of moisture. Generally used as moisture proofing agents, water repellents, mold release agents, etc., such as silicone resins,
Fluororesins, stearates, waxes, rosin esters, etc. can be used, but depending on the type, when applied to the edges of the film, the edges of the film may stick together. As a result of various studies, it was found that oil-based oils such as silicone oil, synthetic oil, and mineral oil are the most desirable. In short, it is necessary to be able to prevent the edges of the film wound into a roll from sticking, but in order not to deteriorate the degree of vacuum during vacuum evaporation, it is desirable that the material is not a low boiling point compound.

Various methods can be considered for applying the anti-sticking agent, for example,
The plastic film used as the raw material is cut into long strips several hundred meters wide and then rolled into rolls before being used for vacuum deposition, so an anti-sticking agent is applied to the cutting blade when cutting into long strips. By keeping it for a while, an anti-sticking agent is applied to the edges of the cut film. To ensure that the cutting blade is continuously coated with the anti-sticking agent, for example, the tip of the rotating cutting blade is brought into contact with a sponge impregnated with the anti-sticking agent, so that the anti-sticking agent is constantly supplied. Make it. Alternatively, in the case of razor blade cutting, a very small amount of the anti-sticking agent may flow along the blade edge. Further, when the film is cut into long strips and then wound into a roll, an anti-sticking agent can be applied to both ends of the long strip of film. In this case, a sponge, sponge, etc. is impregnated with an anti-adhesion agent, and is brought into contact with both ends of the film wound into a roll. Alternatively, an anti-sticking agent may be applied to both end surfaces of a roll of film cut into long strips and wound into a roll.

In this case, in addition to application using a sponge or the like, application can also be performed using a spray set.

In addition, if the rolled film has been stored for a long time, or if the end of the film has partially stuck as a result of moisture adhering to it due to touching the end, please remove both ends. By cutting off several tens of pieces and applying an anti-sticking agent at that time, it is possible to prevent breakage during vacuum deposition even if the pieces are stored and touched by human hands.

The amount of anti-adhesion agent applied to both ends of the long strip film is 0.1
A width from rtan to about the extent of opening can sufficiently prevent the ends from sticking. If the anti-sticking agent penetrates into the center of the strip-like film, metal deposition will be hindered in the area to which the anti-sticking agent is attached, which is undesirable. Normally, when metal is vapor-deposited onto a long strip of film, in order to prevent the metal from adhering to the cooling can, masking is performed up to about 15 mm on both ends of the film. When cutting into narrow widths, the parts on both ends of the long strip film where metal is not vapor-deposited are 5 to 15 mm.
The product is manufactured by cutting off pieces of about mm. Therefore, if the application of the anti-sticking agent is kept within this range, no film loss will occur due to the anti-sticking agent.

According to the present invention, an anti-sticking agent is applied to both ends of a thin long strip-shaped film made of a hygroscopic plastic such as polyester or polycarbonate and having a thickness of 4 μm or less, which is wound into a roll. When metal vapor deposition is performed on the surface of a film while unwinding it from an unwinding roll, there is no cutting of the film due to scratches on the edges caused by sticking of the edges of the film, and there is no breakage of the film during vacuum vapor deposition. can be prevented. In particular, thickness 1
．． Regarding the vacuum deposition of metal onto ultra-thin films of 5 to 3.0 pm, conventionally the current situation was that more than 50% of the films were broken, but according to the present invention, film breaks almost never occur. Therefore, the yield based on raw materials is improved, and operational losses caused by film breakage can also be prevented.

Example 1 Width 5 made of polyethylene terephthalate with a thickness of 2 μm
When a sponge impregnated with silicone oil (product name: 5H200 oil manufactured by Tone Silicone) was brought into contact with both end surfaces of a roll of 6,000 m long film cut into 00 mm, the ends of the film 1-2
Silicone oil was applied to a width about the size of the throat. In a vapor deposition apparatus in which this roll is separated into a vapor deposition chamber with an evaporation source and a film winding chamber, the unwound film passes through the vapor deposition chamber with a cooling can as the back, and metal vapor deposition is performed at this time. Then, vacuum evaporation of aluminum was performed on the above-mentioned ilm. The degree of vacuum is 2 x 10-'To
rr', and the evaporation source temperature was 1450°C. Aluminum could be deposited over the entire length of the long strip film of 6000 m without causing any breakage of the film.

Comparative Example When a roll of the same film as in Example 1 was vacuum-deposited as in Example 1 using the 11th unwinding roll without applying silicone oil to both ends, aluminum was vacuum-deposited up to approximately 200 m. The film broke when this was done.

Example 2 A film made of polyethylene terephthalate with a thickness of 2 μm and having a width of 500 meters and a length of 6,000 meters, which has a risk of being cut when vacuum-depositing metal because the edges are partially fixed, was cut at each end by 20 tubes. It was cut off using a slitter machine to obtain a film with a width of 460 m. A rotary blade was used as the cutting blade, and the tip of the blade was placed in contact with a sponge impregnated with silicone oil (product name: 5H200 oil manufactured by Tone Silicon ■).

The film whose edges were coated with silicone oil as described above was stored in a roll shape for a certain period of time, and after touching the edges of the roll with human hands, aluminum was coated in the same manner as in Example 1. When vacuum evaporation was performed, aluminum could be vacuum evaporated without causing any breakage over the entire length of the film.

Example 3 Both ends of a 25 μm thick polycarbonate film with a width of 600 m and a length of 15,000 m, which had a risk of cutting during vacuum deposition because some of the ends were stuck, were
Cut 9 pieces using a slitter machine in 0 deaf increments, width 56
It was made into a 0-pharyngeal film. A razor blade was used as the blade of the slitter machine, and silicone oil (product name: 5H200 oil manufactured by Tone/Ricon ■) was constantly supplied to the tip of the razor blade.

After storing the film coated with silicone oil on the edges as described above for a long period of time as a roll, and touching the edges of the roll with human hands, aluminum was vacuum-coated in the same manner as in Example 1. When the film was vapor-deposited, aluminum could be vacuum-deposited over the entire length of the film without causing any breakage.

Example 4 Both ends of the same film as in Example 3 were cut off using a slitter machine to obtain a film having a width of 560 mm. A rotary blade is used as the cutting blade, and when the film is cut and wound into a roll, the edges of the film are coated with silicone oil (made by Tone Silicone Product Name 5).
When the film was placed in contact with a sponge impregnated with H200 oil, silicone oil was applied to both ends of the film in a width of 1 to 2 m+n.

After storing this film for a long time and touching the end of the roll with human hands, aluminum was vacuum-deposited in the same manner as in Example 1, and no breakage occurred during the deposition over the entire length of the film. Ta.

Claims (6)

[Claims] (1) When a long strip film made of hygroscopic plastic wound into a roll and having a thickness of 4 μm or less is unwound and a metal is vacuum-deposited on the surface of the film while being rolled up, both ends of the long strip film are A method for preventing breakage of a long strip film during vacuum deposition, the method comprising applying an anti-sticking agent to the film in advance. (2) A film made of hygroscopic plastic is cut into long strips with a cutting blade coated with an anti-sticking agent, and then the film is rolled into a roll, and the anti-sticking agent is applied to both ends of the long strip of film. A method for preventing breakage of a long strip film according to claim 1. (3) Preventing breakage of the long strip-shaped film according to claim 1, which involves applying an anti-sticking agent to both ends of the long strip-shaped film when the Kaiyo film is cut into long strips from hygroscopic plastic and then wound into a roll. Method. (4) A method for preventing breakage of a long strip film according to claim 1, which comprises cutting a film made of hygroscopic plastic into long strips and winding the film into a roll, and applying an anti-sticking agent to both end surfaces of the roll. (5) A method for preventing breakage of a long strip film according to claim 4, wherein the application is carried out using a spray set. (6) The method for preventing breakage of a long strip film according to any one of claims 1 to 5, wherein the hygroscopic plastic is polyester or polycarbonate.