JPS5991094A - Seal film for silk screen printing - Google Patents

Abstract

PURPOSE:To largely facilitate a printing operation, enable to cut a pattern easily and precisely and improve finish of printing, by a method wherein a film is adhered onto a bottom-side film by a weak adhesive, and a releasable paper is laminated thereon by a strong adhesive. CONSTITUTION:The film B is laminated on the base-side film A by a weak adhesive 10, and the releasable paper C is laminated thereon by a strong adhesive 11. The weak adhesive means an adhesive inferior to the strong adhesive 11 in adhesive force, which difference in adhesive force arises from the difference in the kind of the adhesive, additives or in concentration at the time of applying. For example, both of the weak adhesive 10 and the strong adhesive 11 are constituted of an acrylic acid base two-pack curable type adhesive, and the quantity of the adhesive 10 applied is set to be about 0.6-0.7 times of that of the adhesive 11. The film A is preferably a thick one having a thickness of about 100mum, while the film B preferably has a thickness of 10-50mum. The releasable paper C is preferably a film laminate paper in view of easiness in releasing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal film used in a cutting method among seal printing methods.

Silk printing methods include a direct method using a film, an intuitive method using a photosensitive resin film, and a cutting method using the seal film of the present invention. The cutting method has been pointed out to have drawbacks such as not being able to print as much as before, being able to print only on paper or cloth, and not being able to reproduce the screen, so it was probably not used much in general.This is explained in more detail. To explain, the conventional cutting method for silk printing is to paste parchment paper (known as varnished paper) coated with shellac varnish onto the original image, cut the outline with a cutter, remove the characters and printed lines, and then create a silk screen. It was attached to the screen by applying heat from the back with an eye.

To print, place this screen frame on paper or other material,
Print on the screen using a squeegee impregnated with printing ink or paint.

Silk Nu Clean is not limited to silk, but also nylon 4.
gauze is used. This method requires patience and skill in laminating the varnish paper to the silk screen, and requires long hours of manual labor to ensure adhesion.
This has become the most difficult point for business owners. No matter how much effort you put into it, during printing, the varnished paper will peel off because a squeegee or the like presses and sweeps from the silk screen side on the back side. Therefore, even if a skilled person implements this method, it is only necessary to print about 50 sheets at most, and peeling progresses quickly. Even so, it is possible to print to this extent when printing on paper or cloth, but when printing on plastic or metal, the distance between the printing surface such as plastic and the varnished paper must be about 0.6 to 0.5 mm. If you do not print, the printing liquid will flow through the varnished paper, making it impossible to print.If you try to print with the above-mentioned culm spacing, the varnished paper will very easily separate from the screen, making it almost impossible to print.

The method of using varnished paper also has the disadvantage that the silk screen frame cannot be recycled very well.Silk screen frames are expensive, so if you repaper them after one or two uses, the printing cost will be very high. It will be expensive. In this respect as well, in the case of the method of using varnished paper, the varnish paper removing liquid is expensive, and after 4 to 5 times of peeling, the screen can no longer be clogged or the varnished paper is not peeled off sufficiently. As a result, the screen frame had to be replaced. Changing the screen frame itself requires a high level of skill7 and is not easy to do. For this reason, Nuclean cannot be regenerated using the varnish method.

As is clear from the above explanation, in the Kutch-R puffer silk screen printing method using varnished paper, it is impossible to print a large number of lines, skill is required, and the number of printing points is 44. There were many problems, such as the fact that the material was limited to paper and cloth, and most of the materials were almost thrown away.Therefore, many proposals have been made to solve these problems. For example, there is a method of using a special plastic film instead of varnished paper.However, even with these methods, it is still not possible to avoid pasting to a silk screen. However, the problem of peeling off during printing and screen regeneration (which cannot be used for important purposes) has not yet been solved, and the high 111i and high printing costs make it impossible to use normally.Therefore, the inventor first proposed -1- He developed and proposed a new cutting method (Patent Application No. 57-157107) that solved the following difficulties: Rather than pasting varnished paper to the screen, a mold sealing film made by cutting letters or line shapes and leaving the cut outs is pasted on the screen, and then resin is applied to the same Screen-H to form a film. After drying this, the mold seal film is peeled off from the screen to form ink permeable holes.The seal film does not remain on the screen, but the resin coating forms the ink permeable holes. Since it is formed integrally with the other parts, it can withstand repeated use and has the advantage of good finish.The present invention is a sealing film used in such a silk screen method. With the completion of the sealing film of the present invention, the silk screen printing method according to the invention has become easier and more reliable in operation. The seal film is
Film A (A,) is applied with a weak adhesive to film (B).
), and then a release paper is attached to E with a strong adhesive.

This will be explained in detail below with reference to the drawings.

1 to 5 are perspective views showing how a screen is manufactured using the seal fill reno according to the present invention.

FIG. 6 is an enlarged sectional view of the sealing film according to the present invention. First, the sealing film of the present invention is prepared. As shown in Figure 1, place the sticker film (2) on the original picture (1) and stick it tightly, then use the cutter (3) to cut out the letters and pictures (4) as shown in Figure 2. ) and remove the curved part, leaving the mold sealing film as shown in Figure 6. This point is completely different from conventional cutting methods. In the conventional method, the letters and pictures are removed using a cutter. Therefore, in the conventional method, the varnished paper immediately becomes a template, and the parts of pictures and letters that are cut and removed with a cutter become ink permeable holes.

Next, as shown in Figure 3, remove the uncut oval seal
Bring the silk screen frame (6) to the screen (7) and attach the mold sealing film (5) to the screen (7) using an adhesive. Mold seal fill leno L
The screen (7) to which (5) is attached is coated with resin to form a film (8) as shown in FIG. 4. It is preferable that this film has a thickness of 25 to 50 μm, which is usually equal to or less than the thickness of the seal film. The film of Screen-H is very easy to dry, and can be easily dried using, for example, a hair dryer.

Next, the mold sealing film (5) is peeled off and removed. For peeling, it is best to wipe the mold sealing film (5) from the back side of the screen with a cloth impregnated with a solvent. The solvent used at this time should not dissolve the resin film (8), but should be used to remove the mold seal film (5).
It has the property of dissolving only the adhesive bonded to the screen - this will be explained in detail in the next section. After the mold sealing film is removed, an ink permeable hole (9) with the same shape as the original image is formed, as shown in Figure 5. Nuclean, which is made through the above process, is used for printing. As for the printing method, it is possible to freely print by any conventionally known method, such as printing using a Nukuizi or the like that is adhering and impregnated with printing ink or paint.

In this method, the properties of the adhesive used to attach the mold sealing film (5) to Nuclean and the resin used to form the film on the screen are different.

If one is water-soluble, the other is water-insoluble. For example, when the printing ink is oil-based, a water-soluble resin such as polyvinyl alcohol-71/(PVA
) to form a film, and to attach the mold sealing film to the screen, an adhesive that dissolves in an organic solvent (for example, an acrylic rubber adhesive that is soluble in thinner) is used.

If used properly in this manner, the mold sealing film (5) can be easily peeled off in the mold sealing film peeling process by simply wiping the adhesive surface of the mold sealing film (5) from the back of the screen with a cloth impregnated with an organic solvent. Furthermore, the screen film remains stable even during printing with oil-based ink, and can be printed many times (several thousand sheets). After printing is completed, simply pouring water on the screen film dissolves the film, making it easy to regenerate the screen. Contrary to this example, if the printing ink is water-soluble, the film formed on the screen is made of a water-insoluble resin, and the mold sealing film is attached to the screen using a water-soluble adhesive. can achieve the purpose.

According to the silk screen printing method described in detail below, unlike the pasting of varnished paper onto Nuclean, the varnish film is integrally formed on the screen, so it can withstand multiple printings and print multiple sheets. can be printed.

Moreover, the screen formation does not require any skill and can be done in a short time. Furthermore, the range of printing can be expanded to include not only paper and cloth, but also plastic, glass, metal, and other materials that were difficult to print using conventional cutting methods.

An example of the structure of the seal film is shown in Figure 6. This sealing film has a multilayer structure, and a film (B) is laminated to the bottom film (A) using a weak adhesive of 00, and then a release paper ( C)
is pasted. A weak adhesive is an adhesive that has a weaker adhesive strength than a strong adhesive θυ, and the difference in adhesive strength is due to differences in the type of adhesive, additives, or coating concentration. In the illustrated example, both the weak adhesive 11 (J) and the strong adhesive (11) are acrylic/phosphoric acid ester type adhesives, and the former is about 60 to 70% of the latter. The adhesive is soluble in thinner.The film (A) serves as a paste and should preferably be about 100μ thick.

The film (n) serves as the aforesaid tapered seal film (5), and as a result of various studies, it is preferable to have a thickness of 10 to 50 μm. It is easy to form strips when a flexible polyester film is used for the film (A) and the film (B), but other films made exclusively for polyethylene or polypropylene may also be used.

In this example, the release paper (C) is glassine paper laminated with a polyethylene film.In order to be able to release 311I despite the presence of a strong adhesive 0υ, the release paper (C) is made by laminating a film on the paper and applying adhesive to the film part. It is advisable to use adhesive for adhesion or to use one that has been treated with paraffin. Furthermore, the release paper (C) is not limited to paper, and may be replaced by aluminum foil, plastic film, or the like. Release paper (C) is used to protect the strong adhesive until it adheres to the screen. In the example shown in FIG. 1, a transparent plastic film is used as the release paper (C), and the entire sheet, seal fill sheet, etc. are transparent. In terms of ease of peeling, it is II.
Film laminated paper is preferable for III paper (C).

In that case, in order to make a mold seal film by cutting the seal film, it is preferable to place the original picture on the seal film and cut from above using a cutter.

Remove the release paper from the mold sealing film left behind by cutting, and remove the thick base film (A) and film (FI) V.
At this time, the release paper left on the mold seal film is also removed, and when the film (B) is brought into close contact with the screen, it is strongly adhered to the screen by the strong adhesive (11). In this state, the film (A) can be removed easily since the film (A) and the film (, B,) are bonded with a weak adhesive. As mentioned above, if the resin is applied as shown in FIG. 4, there is no mold sealing film applied, so the mold sealing film (5) is applied later.
By removing it, an ink permeable hole is created. To remove the mold sealing film (5), it is necessary to use a solvent that dissolves the strong adhesive but does not dissolve the resin film. When the above-mentioned strong adhesive is an acrylic acid ester-based adhesive and polyvinyl alcohol is used as the resin film (8), thinner is suitable as the solvent. The seal film makes it extremely easy to perform the unconventional silk screen IJ printing process, which involves integrally forming a resin film on the screen, and allows for easy and precise cutting of the mold, which improves the quality of the finished print. It was made into a good one.

[Brief explanation of the drawing]

0 to 5 are perspective views showing how a screen is manufactured using the sealing film of the present invention.
The figure shows a sealing film. (1) Original picture (2) Sticker film (3) Cutter (4) Picture (5)
Mold sealing film (6) Silk screen frame (7
) Screen (8) Film ((Liink Liao 1 Electron Hole 0() Weak adhesive 00 Strong adhesive (A), (B) Film CG) Release paper or above Applicant 1) Hikari agent Patent attorney Hirozo Mori Department

Claims (1)

[Claims] 1 Place the film (B) onto the film (A) using a weak adhesive.
) and then a release paper (C) is laminated on top of the film (I) using a strong adhesive.