JPS62201245A - Printed protective member - 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 [Field of Industrial Application] The present invention relates to a print protection member for protecting recorded matter (print) using a recording liquid, particularly a print obtained by an inkjet method.

[Conventional method]

Various ink jet recording methods are known, such as an electrostatic suction method, a method that applies mechanical vibration or displacement using a piezoelectric element, and a method that heats ink to foam it and uses the pressure generated at that time. In this method, recording is performed by forming ink droplets using a recording medium (hereinafter referred to as recording paper), and sticking some or all of them onto a recording material such as paper (hereinafter referred to as recording paper). It is attracting attention as a recording method that generates little noise and allows for high-speed printing and multicolor printing.

Water-based recording liquids are mainly used for inkjet recording in view of safety and printing characteristics. When recording using liquid ink, it is generally necessary that the recording liquid does not bleed onto the surface of the recording paper and cause the print to become blurry, and that the ink dries as quickly as possible after recording to prevent unexpected damage. It is necessary not to contaminate the recording paper surface. and,
In a multicolor inkjet recording system that uses two or more different color inks, the amount of ink that adheres to the surface of the recording paper increases, so the recording paper is particularly required to have high ink absorbency.

As described above, recording paper having a porous ink-receiving layer has come to be used as a recording paper that satisfies the performance requirements for recording paper used in inkjet recording, and in particular can provide high ink absorbency. However, since the surface of such recording paper is porous, the gloss is low, and since recording is performed using water-based ink, the gloss of the image on the recording paper is low, making it difficult to see.

Conventionally, as a method of imparting gloss to a recorded image, a method is known in which an image is recorded on recording paper using a recording liquid, and then a glossy liquid is applied by blowing or using a bar coater. However, in the two-leg gloss liquid application method, since the recording paper is porous, the gloss liquid also permeates into the recording paper, and a large amount of the gloss liquid is required to obtain the desired gloss. In addition, since the glossy liquid penetrates into the recording paper more than necessary, the transparency of the recording paper increases and the whiteness decreases. It is difficult to control the desired gloss. Furthermore, it is necessary to use an organic solvent to prevent the dye forming the recorded image from dissolving, which poses a safety problem.

[Problem that the invention seeks to solve]

As a means to solve the above-mentioned problems, a print protection member made of a base material carrying a transfer material is superimposed on the recording surface recorded using a recording liquid from the transfer material side, and these are pressed together. There is a method in which the base material is then peeled off, only the transfer material remains on the recording surface, and only the recording surface is laminated with the transfer material. This method has the advantage of imparting gloss to the print surface and physically protecting the image area. The transfer material for conventional print protection members used in this method is generally composed mainly of thermoplastic resins such as acrylic resin, polystyrene resin, polyester resin, and polyethylene resin. In this case, it was difficult to achieve both bending resistance and blocking resistance. Flexibility is a property required when printing protective members are rolled, and blocking resistance is a property that prevents protective members from adhering or sticking to other protective members when stacked and stored. .

Furthermore, when a conventional print protection member is used, there is a problem in that the print curls after the transfer material is transferred.

[Purpose of the invention]

The present invention was made in view of the two-legged problem, and its objectives are: ■ Excellent gloss imparting properties, as well as bending resistance and anti-blocking properties at the same time; ■ Excellent transferability ■ Use of transfer material To provide a print protection member that physically protects the print surface without causing the protected print to curl.

[Means for solving the invention]

The above object of the present invention is achieved by a print protection member formed by removably laminating a transfer material containing polyvinyl alcohol on a base material.

The present invention uses polyvinyl alcohol, which is excellent in both bending resistance and blocking resistance, as a material for the transfer material.

The first cross-sectional view of the basic structure of the print protection member of the present invention is shown below.
As shown in the figure. In FIG. 1, a print protection member 104 has a transfer material 102 laminated on a base material 101 in a releasable manner.

In the present invention, the term "peelable" means that the adhesive does not peel off during handling, but is adhered to such an extent that it can be peeled off when necessary.

The transfer material +02 is mainly made of polyvinyl alcohol.

The water absorption of polyvinyl alcohol used in the present invention can be adjusted by partially or completely saponifying polyvinyl acetate using an acid saponification method or an alkali saponification method. In other words, the degree of saponification of saponified polyvinyl alcohol (referred to as the degree of saponification)
Water absorption changes depending on the If there is a large difference in water absorption between the recording paper and the transfer material, Purine I will curl, so the degree of saponification of polyvinyl alcohol is adjusted depending on the material of the recording paper. For example, when a general inkjet recording paper is used, the degree of saponification is preferably 60% to 85%.

A plasticizer such as a polyhydric alcohol such as glycerin, ethylene glycol, or diethylene glycol, ethanolamine, or an anionic or nonionic surfactant is added to the transfer material 102 in order to impart appropriate bending durability and towability. It is preferable that The amount of plasticizer added is preferably 50% by weight or less. This is because if the content exceeds 50% by weight, the adhesiveness of the transfer material becomes too high, making it difficult to handle, and blocking is likely to occur when stacked.

Furthermore, the transfer material 102 may contain saponified polyacrylic acid, hydroxymethylcellulose, carboxymethylcellulose, methylcellulose, polyethylene glycol, casein, alginic acid, etc., as necessary, for the purpose of imparting plasticity, lowering the melting temperature, and improving transferability. Water-soluble polymers such as soda, gelatin, starch, dextrin, and glue may also be added.

As the base material 101, any material can be used as long as it can support the transfer material and provide removability of the transfer material 102 if necessary, such as paper, cloth, or plastic film. In addition, in order to obtain better or sufficient releasability, the surface of the base material was treated with a release agent capable of imparting various release properties, such as silicone resin, polyester resin, or thermosetting resin, depending on the material of the transfer material. You may also use This release agent treatment can be performed by extrusion lamination, dry lamination, or solvent coating. Further, if the base material is formed from a polyethylene terephthalate film, a polypropylene film, or the like, the film itself has peeling performance, so that a good transfer agent peeling effect can be obtained.

The thickness of the base material 101 is 5 to 2000 gm, preferably 10 gm.
~500 tiles is recommended.

In the print protection member of the present invention, in order to further improve the adhesion of the transfer material to the print, an adhesive is disposed on the surface of the transfer material as shown in FIG. ).

This print protection member 204 is made up of a base material 201 and a transfer material 202 and an adhesive material 203 arranged in the same order.

The adhesive 203 used here is made of resin such as butyral resin, polyester resin, acrylic resin, urethane resin, rubber resin, polyolefin resin, etc., and is appropriately selected depending on the material of the recording paper on which the print will be formed. The adhesive 203 acts as a heat sealing material, adhesive material, etc. depending on the type of resin used.

An example of a print protection method using the print protection member of the present invention will be explained with reference to FIG.

First, print 2 on the surface of the adhesive 203 of the print protection member.
05 in close contact. Next, these are heated while being pressed together to melt the adhesive 203 and fuse it to the print. Finally, the base material 201 is peeled off from the transfer material 202 to complete the print protection process.

The print protection member of the present invention and the print to be protected (
Both or one of the transfer target members) may be a sheet material or a roll material.

The transfer material included in the print protection member of the present invention is mainly made of polyvinyl alcohol, which is strong, resistant to tearing and abrasion, and particularly has excellent tensile strength, and is useful for reinforcing the print after transfer. Also, because it has low permeability to oxygen gas, it is useful for thickening prints and preventing photo-oxidation.

Furthermore, by disposing an adhesive on the surface of the transfer layer, there is no peeling after lamination, and the product has excellent long-term storage stability.

〔Example〕

Specific examples and comparative examples of the print protection member of the present invention are listed below.

Example 1 The resin shown in the Example 1 column of Table 1 was applied to a 200-thickness 0 release process paper whose surface was treated with polyethylene thalphthalate as a release agent, and dried at 80°C for 1 hour to give a coating thickness of 1.
A layer of 0u+ transfer material was formed. Next, butyral resin (
A layer of ESLEL B BM-5 (manufactured by Miki Kagaku Co., Ltd., trade name) was further coated on the transfer material layer, and dried at 80°C for 1 hour to give a coating thickness of 5 scales to obtain the print protection member of the present invention. .

Separately, an image was recorded on coated inkjet paper using Color Inkjet A-1210 manufactured by Canon to obtain a print (transferred member). The above-mentioned print protection member is superimposed on the image surface of this print from the transfer material side, and a roller with a surface temperature of 180°C is applied with a linear pressure of 4 kg/am to 10 mm/min.
After laminating at a speed of 5 seconds and cooling, the release coated paper of the print protection member was peeled off from the image surface.

The bending resistance of the print whose surface is protected by the above process,
The blocking resistance and curl condition were examined. The results are shown in Table 1.

Flexibility was evaluated according to JIS K5400.

The blocking resistance was evaluated according to JIS 202191 "Tackiness resistance test for processed paper for packaging".

Karl has 15 B-B size surface protected prints.
After leaving it at °C13 (H humidity), observe the height of the highest raised part, ○ up to 20 tiles, 40μ over 20 tiles
Less than 40 tiles were evaluated as △, and 40 or more tiles were evaluated as ×.

At this time, those that did not cause curling were marked as O.
Those with significant curling were marked as x, and those in between were marked as △.

Examples 2 and 3, Comparative Examples 1 to 3 Print protection members having the same structure as in Example 1 were obtained, except that the materials shown in Table 1 were used as the transfer material. Using these print protection members, the transfer material was transferred to a print in the same manner as in Example 1, and an evaluation test was conducted on the protected print.

These results are shown in Table 1.

〔Effect of the invention〕

As explained above, the print protection member of the present invention: ■ has excellent gloss imparting properties and also has bending resistance and anti-blocking properties at the same time; ■ has excellent transferability; ■ prints protected by the transfer material curl. ■It has the effect of physically protecting the print surface.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of the basic structure of the print protection member of the present invention. 101.201: Base material 102.202: Transfer material 203: Adhesive material 104.204 + Print protection member 205 Niblint (transferred material) Patent applicant Canon Co., Ltd. Agent Tadashi Wakabayashi Figure 1 Figure 2

Claims (3)

[Claims] (1) A print protection member formed by removably laminating a transfer material containing polyvinyl alcohol on a base material. (2) The print protection member according to claim 1, wherein an adhesive is disposed on the surface of the transfer material. (3) The print protection member according to claim 1, wherein a surface of the base material that is in close contact with the transfer material is treated with a release agent.