WO2013051664A1

WO2013051664A1 - Gauze for screen printing and screen printing method

Info

Publication number: WO2013051664A1
Application number: PCT/JP2012/075843
Authority: WO
Inventors: 圭一梶田; 健一郎高須; 瑞恵閑田
Original assignee: 積水ナノコートテクノロジー株式会社
Priority date: 2011-10-07
Filing date: 2012-10-04
Publication date: 2013-04-11
Also published as: JPWO2013051664A1; JP6132403B2; TW201328899A

Abstract

Provided is a gauze for screen printing, constructed from synthetic fibres, and comprising a silk-like fabric whereof only the main surface opposite to the side which is rubbed with a squeegee during screen printing is coated with a metallic thin film. The aim of the present invention is to provide a gauze for screen printing which can be manufactured at low cost, with which high precision printing can be performed and which has high durability with regards to squeegeeing, and a screen printing method using the same.

Description

Screen printing bag and screen printing method

The present invention relates to a screen printing pad and a screen printing method.

In screen printing, a printing paste (eg, ink, conductive paste) is supplied to the upper surface of a printing plate having screen printing ridges disposed on a substrate, and the upper surface of the screen printing ridge is applied with a squeegee. By rubbing (that is, squeezing), the printing paste is passed through a screen-printing basket to print the printing paste on the substrate.

紗 Conventionally, cocoons made of synthetic fiber filaments are used as screen printing cocoons.

However, screen printing jars made of synthetic fibers are charged by squeegee rubbing during printing, etc., thereby adsorbing dust, scattering of printing paste during printing, and printing paste from screen printing jars. Deterioration of slipperiness (ease of passing of printing paste when screen paste passes through screen printing basket), insufficient printing paste transferred from printing pad to substrate Problems such as leveling may occur and high-precision printed images may not be obtained, and when electronic components are mounted on the substrate, these electronic components may be electrically damaged. There was a problem.

In order to solve such problems, there has been proposed a technique for suppressing charging by subjecting a sheet-like screen made of synthetic fibers to a sputtering process to form a metal thin film on the synthetic fibers (for example, Japanese Patent Laid-Open No. Hei 3). No. 236962, JP-A-6-1089, JP-A-7-285276).

In this case, in order to prevent electrification, it was considered essential that a metal thin film was formed on the surface on the side to be squeezed during printing of the screen printing paddle. For example, Japanese Patent Application Laid-Open No. 6-1089 describes that it is preferable to form a metal thin film on both sides of the screen printing ridge, rather than forming a metal thin film on one side of the screen printing ridge in order to prevent electrification. .

However, in such screen printing wrinkles, because the metal thin film on the surface to be squeezed easily peels off due to friction during squeezing, the durability of the printing plate is low, In addition, there is a problem that a highly accurate printed image may not be obtained as a result of the peeled metal thin film adhering to the substrate.

In order to solve such a problem of peeling of the metal thin film, Japanese Patent Laid-Open No. 10-86317 discloses a core-sheath structure in which a sheath component is a polyester composition having a higher alkali hydrolyzability than a core component composed of a polyester composition. The mesh fabric composed of monofilaments is roughened so that the sheath portion of the monofilament has a weight loss rate of 0.1% by weight or less, and a thin film containing a metal component by sputtering is formed on the roughened surface. A functional screen for printing, which is characterized by the above, has been proposed.

Japanese Patent Laid-Open No. 3-236962 Japanese Patent Laid-Open No. 6-1089 JP-A-7-285276 Japanese Patent Laid-Open No. 10-86317

However, the technique proposed in Japanese Patent Application Laid-Open No. 10-86317 requires the use of a special synthetic fiber, which increases the manufacturing cost and, in principle, cannot completely suppress the peeling of the metal thin film. There was a problem.

Accordingly, an object of the present invention is to provide a screen printing ridge that can be manufactured at low cost, enables high-precision printing, and has high durability against squeezing, and a screen printing method using the same. .

Surprisingly, the inventors of the present invention do not form a metal thin film on the surface to be squeezed of the screen printing wrinkle, but if a metal thin film is formed only on the surface facing the substrate, it is accurate. It has been found that printing becomes possible and, of course, according to the configuration of such a screen printing ridge, the problem of peeling due to squeezing is substantially completely suppressed.

That is, the present invention includes the following aspects.
Item 1.
A screen-printing bag made of a cocoon-shaped woven fabric made of a synthetic fiber and having only a main surface opposite to a side rubbed by a squeegee in screen printing coated with a metal thin film.
Item 2.
Item 2. The screen printing bag according to item 1, wherein the synthetic fiber is a polyester fiber.
Item 3.
Item 3. The screen printing bag according to item 1 or 2, wherein the metal thin film is a metal thin film formed by sputtering.
Item 4.
Item 4. The screen printing pad according to any one of Items 1 to 3, wherein the metal thin film is a stainless steel thin film.
Item 5.
Item 5. The screen printing pad according to any one of Items 1 to 4, wherein the thickness of the metal thin film is 80 μg / cm ² or less as a metal adhesion amount.
Item 6.
Item 6. The screen printing pad according to any one of Items 1 to 5, wherein the thickness of the metal thin film is 3 μg / cm ² or more in terms of metal adhesion.
Item 7.
Item 7. The screen printing bag according to any one of Items 1 to 6, wherein the main surface of the bag-like fabric opposite to the side coated with the metal thin film is antistatic treated with an antistatic agent.
Item 8.
A step of preparing a screen printing wrinkle made of a woven fabric made of synthetic fiber and having only one main surface covered with a metal thin film, and a squeegee on the main surface opposite to the side covered with the metal thin film The screen printing method which has the process rubbed by.
Item 9.
A screen printing method comprising the steps of preparing the screen printing wrinkle according to claim 1 and rubbing a main surface opposite to the side coated with the metal thin film with a squeegee.

According to the screen printing scissors of the present invention, there are provided a screen printing scissors that can be manufactured at low cost, can be printed with high precision, and have high durability against squeezing, and a screen printing method using the same. be able to.

It is a longitudinal cross-sectional view which shows an example of a sputtering device. 6 is a graph showing the height of fine line-shaped ink printed using the screen printing ridge of Comparative Example 1. 3 is a graph showing the height of fine line-shaped ink printed using the screen printing ridge of Example 1. FIG.

1.1. Screen-printing scissors The screen-printing scissors of the present invention are made of synthetic fibers and are made of a scissor-like woven fabric in which only the main surface opposite to the side rubbed by the squeegee in screen printing is coated with a metal thin film.

1.1.1. Saddle-like woven fabric The saddle-like woven fabric in the scissors for screen printing of the present invention has the synthetic fiber as warp and weft, and the warp and weft form an opening. That is, the saddle-like woven fabric has a net-like form. The woven structure of the cocoon-shaped woven fabric is preferably a structure such as a flat structure that is less prone to misalignment and has a uniform vertical and horizontal opening surface. The diameter of the opening is preferably 20 to 100 μm. The opening ratio of the cocoon-shaped fabric is preferably 20 to 70%. The fiber density of the cocoon-shaped woven fabric is preferably 50 to 200 / cm.

The wire diameter of the synthetic fiber is preferably 10 to 70 μm. If the wire diameter is too thin, the synthetic fiber is easily cut, whereas if it is too thick, precise printing becomes difficult.

The numerical values related to these cocoon-shaped fabrics are substantially the same as the numerical values of the screen printing ridges of the present invention.

The synthetic fiber in the present invention is preferably a polyester fiber.

Examples of the polyester constituting the polyester fiber include polyethylene terephthalate, modified polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate (eg, polyethylene-2,6-naphthalate) and the like.

The synthetic fiber is preferably a monofilament.

The thickness of the cocoon-shaped fabric is preferably 30 to 80 μm. As will be described later, the thickness of the metal thin film in the screen printing ridge according to the present invention is very thin compared to the thickness of the ridge-shaped woven fabric. It is substantially the same as the thickness of the fabric.

When the screen printing wrinkle of the present invention is used for screen printing, the printing paste is held in the opening of the wrinkle-shaped fabric. The holding amount varies depending on the hole diameter of the opening and the thickness of the cocoon-shaped woven fabric, and is preferably 5 to 70 cm ³ / m ² .

As such a cocoon-like woven fabric in the screen printing cocoon of the present invention, a cocoon made of synthetic fiber filaments conventionally used as a screen printing cocoon can be used.

1.1.2. Metal thin film In the saddle-like woven fabric in the screen printing ridge according to the present invention, only the main surface opposite to the side rubbed by the squeegee in screen printing is coated with a metal thin film.

That is, in the screen-printing scissors of the present invention, the metal thin film exists only on one main surface of the scissor-shaped fabric and does not exist on the other main surface. However, as long as the effect of the present invention is not lost, a metal thin film or a fragment thereof may exist on a part of the other main surface, and a metal is formed on the side surface of the synthetic fiber constituting the saddle-shaped woven fabric. A thin film or a fragment thereof may be present. Such screen printing wrinkles are also within the scope of the present invention.

The metal thin film in the screen printing basket of the present invention is preferably a metal thin film formed by sputtering.

The metal thin film in the screen printing basket of the present invention is preferably an amorphous thin film.

The metal thin film needs to have an opening so as not to block the opening of the saddle-like woven fabric as described above. This is naturally achieved when the metal thin film is appropriately formed on the main surface of the saddle-shaped woven fabric, as will be described in the production method described later. The metal thin film as a whole is preferably electrically connected and conductive, that is, not divided.

Examples of the metal constituting the metal thin film in the screen printing basket of the present invention include simple metals such as titanium, silver, aluminum, tin, zinc, nickel, copper, cobalt, chromium, antimony, niobium; Hastelloy (trademark), permalloy And alloys such as stainless steel, monel, and cobalt-based alloys. Of these, titanium and stainless steel are preferable. That is, the metal thin film in the screen printing basket of the present invention is preferably a titanium thin film or a stainless steel thin film. Examples of stainless steel constituting the stainless steel thin film include martensitic stainless steel, ferritic stainless steel, and austenitic stainless steel. Of these, austenitic stainless steel is preferable (eg, SUS310S).

The thickness of the metal thin film is not particularly limited as long as it has electrical conductivity. However, the metal adhesion amount is preferably 80 μg / cm ² or less, more preferably 35 μg / cm ² or less, and preferably 3 μg / cm ² or more. More preferably, it is 5 μg / cm ² or more.

If the thickness is too thin (that is, if the amount of metal adhesion is too small), the desired effect is difficult to obtain, whereas if it is too thick (that is, if the amount of metal adhesion is too large), the metal thin film will open. As a result, the aperture ratio is reduced and the fine line printability is lowered, and the manufacturing cost is increased. Moreover, even if the said thickness is too thin or too thick, the adhesiveness (it may be called a metal adhesiveness in this specification) of the metal thin film to a saddle-like textiles falls.

In addition, in this-application specification and a claim, the adhesion amount of a metal is measured according to the fluorescent X ray method. Here, the numerical value of the amount of adhesion is expressed as the mass of adhered metal per unit area analyzed.

1.1.3. Manufacturing method The screen printing paddle of the present invention is, for example,
Step A for preparing a cocoon-like woven fabric composed of synthetic fibers, and Step B for covering the main surface of the cocoon-like fabric opposite to the side rubbed with a squeegee in screen printing with a metal thin film
It can manufacture by the manufacturing method containing.

1.1.3.1 Process A
In step A, a cocoon-like fabric composed of synthetic fibers described in detail above is prepared. In order to use for the below-mentioned process B, the said cocoon-shaped textiles are preferably long.

Such a cocoon-shaped woven fabric may be manufactured by a method similar to a method for manufacturing a cocoon made of synthetic fiber filaments conventionally used as a screen printing cocoon.

Here, preferably, the hook-shaped woven fabric is subjected to antistatic treatment.

As the method of the antistatic treatment, for example, spraying of an antistatic agent on the surface of the cocoon-shaped fabric is preferable.

The antistatic agent is mainly a conventionally known surfactant having an effect of preventing or suppressing charging such as an anionic surfactant, a cationic surfactant, a nonionic surfactant, or an amphoteric surfactant. What is contained as a component is mentioned.

The amount of the antistatic agent only needs to be a level that can prevent or suppress the charging, and is usually less than 1% by weight with respect to the weight of the woven fabric.

The antistatic treatment is preferably performed on one main surface of the saddle-shaped fabric. When the antistatic treatment is performed on one main surface of the saddle-shaped woven fabric, from the viewpoint of adhesion of the metal thin film to the saddle-shaped fabric, the surface of the metal thin film opposite to the antistatic-treated surface is used. It is preferable to perform sputtering on the substrate.

Synthetic fibers often have a hydrophobic surface and are prone to static electricity damage during sputtering processing, but even when sputtering is performed on the surface opposite to the antistatic surface by antistatic treatment. Electrostatic failure can be prevented or suppressed, and as a result, the productivity of the screen printing bag of the present invention is improved.

1.1.3.2. Process B
The coating of one main surface of the cocoon-shaped fabric with a metal thin film is preferably carried out by sputtering. Sputtering is performed such that the metal thin film does not block the opening of the woven fabric. When the hook-shaped woven fabric is subjected to antistatic treatment in Step A, it is preferable to perform sputtering on the opposite side of the antistatic treated surface from the viewpoint of adhesion of the metal thin film to the hook-shaped woven fabric. Hereinafter, as an example, formation of an amorphous thin film of stainless steel by sputtering will be described with reference to FIG.

FIG. 1 is a longitudinal sectional view showing an example of a sputtering apparatus, in which a sealable casing 10 is divided into a lower sputter chamber 12 and an upper fabric chamber 13 by a horizontal partition plate 11, and a lower sputter is formed. A flat plate-like target 14 made of stainless steel is fixed on a hollow target source 15 at the center of the chamber 12, and is cooled from the lower surface side by cold water passed through the target source 15. The anode 16 is horizontally installed above and to the left and right of the target 14. On the other hand, a water-cooled cylinder 17 is horizontally and rotatably installed in the lower part of the upper fabric chamber 13, and its lower half projects into the sputtering chamber 12 from an opening 11 a formed in the partition plate 11. A feeding shaft 18 for the cocoon-shaped fabric F is disposed on the upper right side of the fabric chamber 13 and a winding shaft 19 for the cocoon-shaped fabric F is disposed horizontally and rotatably on the upper left side, and is wound around the feeding shaft 18. The saddle-like woven fabric F is drawn out, wound around the water-cooled cylinder 17 through the guide roller 20 at the upper right part, and wound around the winding shaft 19 through the guide roller 20 at the upper left part. Note that a second vacuum pump 21 is connected to the sputtering chamber 12, and a first vacuum pump 22 is connected to the fabric chamber 13.

Preferably, before the coating with the metal thin film by sputtering, the woven fabric F is dried under a drying condition of, for example, 100 to 130 ° C. until the water content becomes 0.1% by weight or less.

The long cocoon-shaped woven fabric F is wound on a winding core in a roll shape, and the winding core is attached to a feeding shaft 18 provided in the casing 10 that can be sealed. From the winding core on the feeding shaft 18 The leading end of the drawn woven fabric F is fixed to a winding core on a winding shaft 19 provided in parallel with the feeding shaft 18. Then, by rotating the feed shaft 18 and the take-up shaft 19, the cocoon-shaped fabric F is fed forward at a predetermined speed in the expanded state. In the present invention, the cocoon-shaped fabric F is fed out. Cooled between the shaft 18 and the winding shaft 19, the surface temperature of the cocoon-shaped fabric F is preferably maintained at 1/2 or less, particularly preferably 1/3 or less of the melting point of stainless steel (1620 to 1720 ° K). The When this surface temperature exceeds 1/2 of the melting point (absolute temperature), the stainless steel thin film formed by sputtering is crystallized, making it difficult to obtain an amorphous thin film.

The saddle-like fabric F can be cooled by bringing the saddle-like fabric F into contact with the large-diameter water-cooled cylinder 17 and feeding it forward. Further, as another method, there is exemplified a method in which a large number of small-diameter water-cooled rollers are pressure-contacted in the form of guide rollers and forwardly fed. Note that the target 14 is also preferably cooled by water cooling or other cooling means, or heat radiation is preferably improved, which facilitates formation of an amorphous thin film. The rod-shaped anode 16 longer than the width of the saddle-like fabric F on one side of the saddle-like fabric F moving in contact with the water-cooled cylinder 14 and the target 14 made of flat stainless steel are the saddle-like fabric F and the target. The anodes 16 are arranged so as to be close to each other and parallel to each other, and a DC voltage of 500 to 1000 V is applied between the anodes 16 and the target 14. The inside of the casing 10 is depressurized in a sealed state in advance, and then an inert gas such as argon gas is introduced to form an inert gas atmosphere of about 1 × 10 ⁻¹ to 1 × 10 ⁻² Pa.

2.2. Screen printing method The screen printing method of the present invention comprises a step C of preparing a screen printing ridge composed of a cocoon-like woven fabric composed of synthetic fibers and having only one main surface coated with a metal thin film, and the metal Step D of rubbing the main surface opposite to the side coated with the thin film with a squeegee
Have

The screen printing method of the present invention uses a screen printing ridge composed of a woven fabric made of synthetic fiber and having only one main surface coated with a metal thin film, and is opposite to the side coated with the metal thin film. Except for rubbing the main surface on the side with a squeegee, it can be carried out in the same manner as the conventional screen printing method.

2.2.1. Process C
In Step C, for example, the screen-printing scissors of the present invention are prepared by the manufacturing method described above.

A printing plate can be produced in the same manner as a conventional screen printing paddle using the prepared screen printing paddle of the present invention. That is, the screen printing ridge according to the present invention is held, for example, on a metal (eg, aluminum) frame under a predetermined tension, and a masking layer is formed thereon to obtain a printing plate.

The printing plate having the screen printing ridge according to the present invention is grounded via the metal thin film and the metal frame, so that charging is suppressed on the metal thin film side.

The printing plate is arranged on the substrate so that the main surface on the metal thin film side faces the substrate. Then, the printing paste is supplied on the opposite main surface.

2.2.2. Process D
In step D, by sliding a squeegee on the main surface of the screen printing basket opposite to the side coated with the metal thin film (that is, on the main surface supplied with the printing paste), the main surface Rub. As a result, the printing paste passes through the screen printing basket and is printed on the substrate.

The printing paste used in the printing method of the present invention is not particularly limited, and printing pastes having various viscosities can be used. Examples thereof include ink and conductive paste.

Further, the substrate to be printed in the printing method of the present invention is not particularly limited, and examples thereof include paper, cloth, a substrate for electronic parts, and the like.

According to the printing method of the present invention, problems due to charging due to squeezing and peeling of the metal thin film are suppressed, and a high-precision printed image becomes possible.

Example 1
[Manufacture of screen printing candy]
Using the apparatus shown in FIG. 1, the screen printing wrinkles of the examples were made by sputtering stainless steel on a scissors-like fabric F (140 warps / cm, wire diameter 30 μm) made of polyethylene terephthalate fibers. Manufactured. That is, austenitic stainless steel (SUS310S) was used for the target 14. The hooked fabric F is pulled out from the feeding shaft 18 and wound around the water-cooled cylinder 17, and the tip of the hooked fabric F is wound around the winding shaft 19, and the feeding shaft 18, the winding shaft 19 and the water-cooled cylinder 17 are wound. Was rotated and the cocoon-shaped fabric F was conveyed clockwise at a speed of 4.4 m / min. First, the first vacuum pump 22 is driven to reduce the pressure in the casing 10 to about 5 Pa, then the second vacuum pump 21 is driven to lower the pressure to about 5 × 10 ⁻⁵ Torr, Thereafter, argon gas was introduced to adjust the pressure to 1 × 10 ⁻¹ to 1 × 10 ⁻² Pa, and a DC current of 500 V × 60 A was passed between the anode 16 and the target 14, so The stainless steel thin film (metal adhesion amount: 12 μg / cm ² ) was formed on one side, and the screen printing ridge of Example 1 was obtained.

Example 2
The hook-shaped woven fabric F used in Example 1 was subjected to antistatic treatment. The antistatic treatment was performed by spraying an appropriate amount of a spray solution containing sodium lauryl sulfate, which is an anionic surfactant, on one side of the cocoon-shaped fabric F. Sputtering treatment was performed on this antistatic treatment surface in the same manner as in Example 1 to obtain a screen printing pad of Example 2 (metal adhesion amount: 12 μg / cm ² ).

Example 3
Example 3 was performed in the same manner as in Example 2 except that the sputtering process was performed on the side opposite to the surface subjected to the antistatic process and that the metal adhesion amount was adjusted to 4 μg / cm ² by adjusting the conveyance speed. A screen printing paddle was obtained.

Example 4
A screen printing wrinkle of Example 4 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 6 μg / cm ² by adjusting the conveyance speed.

Example 5
Except that the metal adhesion amount was adjusted to 12 μg / cm ² by adjusting the conveyance speed, in the same manner as in Example 3 (in other words, the surface opposite to the antistatic treatment surface of the woven fabric F was subjected to sputtering treatment) In the same manner as in Example 2 except that the above was obtained, a screen printing basket of Example 5 was obtained.

Example 6
A screen printing wrinkle of Example 6 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 25 μg / cm ² by adjusting the conveyance speed.

Example 7
A screen printing wrinkle of Example 7 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 35 μg / cm ² by adjusting the conveyance speed.

Example 8
A screen printing wrinkle of Example 8 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 50 μg / cm ² by adjusting the conveyance speed.

Example 9
A screen printing wrinkle of Example 9 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 80 μg / cm ² by adjusting the conveyance speed.

Example 10
A screen printing wrinkle of Comparative Example 2 was obtained in the same manner as in Example 3 except that the metal adhesion amount was adjusted to 90 μg / cm ² by adjusting the conveyance speed.

Comparative Example 1
The cocoon-shaped woven fabric F was used as the screen printing ridge of Comparative Example 1.

Comparative Example 2
A screen printing bag (metal adhesion amount 12 μg / cm ² ) of Comparative Example 2 was obtained in the same manner as in Example 5 except that the metal thin film was formed as a squeezed surface.

Comparative Example 3
Except that a metal thin film on both sides, in the same manner as in Example 5 to obtain a screen printing gauze of Comparative Example 3 (metallic adhesion amount 24 .mu.g / cm ² (per side 12μg / ^cm 2)).

Test example 1
[Create print version]
Each of the screen printing ridges manufactured in the above-mentioned examples and comparative examples was cast on an aluminum frame (320 mm × 320 mm), a tension of 1.10 mm (tension gauge: model STG-75B, Protech), and a bias angle of 30 degrees. The condition was extended. A photosensitive emulsion containing polyvinyl alcohol and plasticized vinyl acetate as a main component is applied on the ridge to a thickness of 4 μm and cured by exposure. A 70 μm wide slit has a spacing of 70 μm. Patterns arranged in a row were formed to obtain the printing plates of the examples and comparative examples.
[Screen printing]
Using each printing plate of the above-mentioned Examples and Comparative Examples and polyester-based one-component evaporation drying ink (PAL mat, Seiko Advance), the shape of the pattern was changed to a urethane squeegee (hardness: 70 °, width: 170 mm). Was screen-printed on a polyethylene terephthalate film (trade name: Lumirror, Toray) under the following conditions using a screen printing machine (LS-15GX, Neurong Seimitsu Kogyo Co., Ltd.) equipped with

<Printing conditions>
Push-in amount: 0.7mm
Clearance: 2.0mm
Squeegee angle: 70 °
Printing speed: 150 mm / second Scraper speed: 150 mm / second Temperature: 22-23 ° C.
Humidity: 40-50%
[Flatness of fine line ink]
The thickness (shape) of the ink layer of the obtained printed matter was analyzed by a color 3D laser microscope (VK-8710). The results are shown in FIG. 2 (Comparative Example 1) and FIG. 3 (Example 1). 2 and 3, the vertical axis represents the surface height of the ink layer, and the horizontal axis represents the measurement distance. 2 and 3, the vertical axis does not indicate the absolute value of the surface height of the ink layer. The lower broken line in the figure is the baseline, and the surface height of the ink layer can be calculated using the lower broken line as the baseline.

As is clear from this, the printed material printed using the printing plate of Example 1 was flatter than the printed material printed using the printing plate of Comparative Example 1. From this, it is understood that the ink removal property and leveling were good.

Furthermore, for each of the examples and comparative examples, the flatness of the ink was evaluated according to the following criteria in four stages: excellent, good, acceptable, and impossible.

<Evaluation criteria for flatness of fine-line ink>
The peak of the ink layer is regarded as a trapezoid, the length of the portion from the maximum value of the surface height to 90% of the maximum value is the upper base length, and the mountain ridges on both sides of the peak of the ink layer intersect with the baseline (ink The flatness of the ink was evaluated according to the following criteria, with the distance between the starting point and the ending point of the layer crest being the bottom base length.

Excellent (◎): The upper base length is 40% or more with respect to the lower base length.
Good (◯): The upper base length is 35% or more and less than 40% with respect to the lower base length.
Possible (Δ): The upper base length is 30% or more and less than 35% with respect to the lower base length.
Impossible (x): The upper base length is less than 30% with respect to the lower base length.

The results are shown in Table 1 (flatness).
[Thin line printability]
About each Example and the comparative example, the fine line printability was evaluated in four steps of excellent, good, acceptable, and impossible according to the following criteria.

<Evaluation criteria for fine line printability>
Ten arbitrary thin line-like inks were selected from the printed ink layer, the surface thereof was observed with a magnifying glass, and evaluated according to the following criteria.
Excellent (◎): All the thin line-like ink observed has no breakage, blurring or blurring.
Good (◯): There is no disconnection, but blurring or blurring is observed with one or two fine-line inks.
Good (Δ): There is no disconnection, but bleeding or blurring is observed with three or four fine-line inks. Impossible (x): Disconnection is observed with one or more fine-line inks, or bleeding or blurring is observed with five or more fine-line inks.

The results are shown in Table 1 (thin line printability).
[Metal adhesion]
About each Example and the comparative example, metal adhesion was evaluated in four steps of excellent, good, good, and bad by the following criteria.

<Evaluation criteria for metal adhesion>
After printing 10 times, the ink on the surface of the plate was wiped off with a cloth soaked with propyl acetate and allowed to dry naturally. Then, arbitrary 10 places of each plate were selected, the surface was observed with a magnifying glass, and evaluated according to the following criteria.
Excellent (◎): Metal peeling on the mesh is observed at less than 5%.
Good (◯): Metal peeling on the mesh is observed at 5% or more and less than 15%.
Good (Δ): 15% or more and less than 35% metal peeling on the mesh is observed.
Impossible (x): Metal peeling on the mesh of 35% or more is observed.

The results are shown in Table 1 (metal adhesion).
[Productivity of screen printing candy]
The productivity of screen-printing ridges was evaluated according to the following criteria in four stages: excellent, good, acceptable, and impossible.

<Evaluation criteria for productivity of screen printing candy>
Excellent (◎): The woven fabric F can be conveyed at high speed.
Good (◯): The woven fabric F can be conveyed at a relatively high speed.
Possible (Δ): The woven fabric F must be conveyed at a low speed.

However, in Example 1 where no antistatic treatment was applied, it took time for the work to be performed due to the influence of static electricity when setting the cocoon-like fabric F in the apparatus, and therefore, the productivity was evaluated as acceptable (Δ).

Further, in Comparative Example 3 in which film formation was performed on both surfaces, it was necessary to perform the vacuum evacuation operation before film formation twice, and the productivity was evaluated to be inferior (×) because the productivity was extremely low.

Further, Comparative Example 1 in which the sputtering process was not performed was evaluated as having excellent (優) productivity.

The results are shown in Table 1 (Productivity).
[Comprehensive evaluation]
Based on the above evaluation, comprehensive evaluation was performed as follows.

<Evaluation criteria for comprehensive evaluation>
The total score of each evaluation was calculated with 3 (excellent), 2 (good), and 0 (good).
Excellent (◎): 10 points or better Good (○): 5-9 points possible (△): less than 5 points However, if there is even one (×) in each evaluation, the overall evaluation is impossible (×) evaluated.

The results are shown in Table 1 (overall).

From the above evaluation results, it can be seen that the scissors for screen printing of the present invention can be manufactured at a low cost, can be printed with high precision, and exhibit excellent characteristics such as high durability.

F: Woven fabric 10: Casing 11: Partition plate 11a: Partition plate opening 12: Sputter chamber 13: Fabric chamber 14: Target 15: Target source 16: Anode 17: Water-cooled cylinder 18: Feed shaft 19: Winding shaft 20 : Guide roller 21: First vacuum pump 22: Second vacuum pump

Claims

A screen-printing bag made of a cocoon-shaped woven fabric made of a synthetic fiber and having only a main surface opposite to a side rubbed by a squeegee in screen printing coated with a metal thin film.
The screen printing bag according to claim 1, wherein the synthetic fiber is a polyester fiber.
The scissors for screen printing according to claim 1 or 2, wherein the metal thin film is a metal thin film formed by sputtering.
The scissor for screen printing according to any one of claims 1 to 3, wherein the metal thin film is a stainless steel thin film.
The screen printing pad according to any one of claims 1 to 4, wherein the thickness of the metal thin film is 80 µg / cm 2 or less in terms of metal adhesion.
6. The screen printing pad according to claim 1, wherein the thickness of the metal thin film is 3 μg / cm 2 or more in terms of metal adhesion.
The screen printing bag according to any one of claims 1 to 6, wherein a main surface of the bag-like woven fabric opposite to the side coated with the metal thin film is antistatic treated with an antistatic agent.
A step of preparing a screen printing wrinkle made of a woven fabric made of synthetic fiber and having only one main surface covered with a metal thin film, and a squeegee on the main surface opposite to the side covered with the metal thin film The screen printing method which has the process rubbed by.