JP2014227192A - Storage bag for plaster printing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage bag in which a printing sheet having a plaster layer as a printing layer, subjected to ink jet printing and having a printed image formed in the plaster layer can be effectively stored.SOLUTION: A storage bag 1 is used to store a plaster printing sheet having a printed image formed in a plaster layer. The storage bag 1 is formed of a film or a sheet in which carbon dioxide gas permeability is 5,000 cm/m.24 hrs.1 atm or more, preferably, 10,000 cm/m.24 hrs.1 atm or more.

Description

  The present invention relates to a storage bag for a printed sheet on which printing has been performed for a plaster printing sheet having a plaster layer as a printing surface.

  With the spread of personal computers and digital cameras to general households, inkjet printers capable of printing clear full-color images are widely used due to their low cost.

  By the way, the printing paper used in the printers as described above, including those used in laser printers other than inkjet printers, is a flat image such as a photograph, and is a painting-like image. There was no one capable of forming a deep image.

  From such a viewpoint, a printing sheet having a stucco layer as a printing layer has been proposed and patented (Patent Document 1).

  This printing sheet is obtained by applying a kneaded mixture of slaked lime (calcium hydroxide) and water on the surface of a base sheet such as paper to form a stucco layer. The layer is what works. In other words, plaster is slaked lime (calcium hydroxide) that reacts with carbon dioxide in the atmosphere to form calcium carbonate, but ink jet printing is performed before this slaked lime is completely carbonated to become calcium carbonate. When applied, the printing ink penetrates into the plaster layer before it is completely carbonated, and further carbonation fixes color material components such as pigments or dyes in the printing ink between the calcium carbonate particles. An image is formed. Further, after the printing is performed, in a state where the carbonation further proceeds and is completed, there is an advantage that the color material components are protected from deterioration factors such as ultraviolet rays, and the fading is prevented.

Patent 5039701

  However, since the printing sheet having the plaster layer before being completely carbonated as described above has just been developed, an unexpected problem has occurred.

  For example, printing on the stucco layer of this printing sheet is usually performed by ink jet printing, and this printing is performed before the stucco layer is completely carbonated, specifically, water used for forming the stucco layer. It is performed by ink jet printing when the carbonation rate of calcium oxide is about 80%. If the carbonation proceeds excessively, the surface of the stucco layer that functions as a printing layer is densified, the permeability of the printing ink is reduced, image bleeding and spots occur, and a fine and beautiful image can be obtained. It becomes difficult. On the other hand, in the state where carbonation has not progressed, the surface of the stucco layer is not densified during printing, so that the surface of the print layer is easily damaged. As understood from this, before printing, in order to suppress the carbonation of the stucco layer and protect the printing surface, this printing sheet is stored by being wrapped with a non-breathable film. Will be sold at.

  However, in the past, no consideration has been given to the storage of a printed sheet on which a printing sheet having such a stucco layer has been printed. That is, at the stage where the printed image is formed on the stucco layer by ink jet printing, since the calcium hydroxide is not completely carbonated, the surface of the stucco layer lacks denseness and has low mechanical strength. . As a result, there has been a problem that, after printing, the plaster layer on which the printed image is formed is damaged due to friction or the like until the plaster layer is almost completely carbonated.

  Accordingly, an object of the present invention is to provide a storage bag capable of effectively storing a printing sheet on which a printing image is formed on a stucco layer by printing on a printing sheet having a stucco layer as a printing layer. It is to provide.

According to the present invention, the storage bag is used for storing a stucco printing sheet having a printed image formed on a stucco layer, and has a carbon dioxide gas permeability of 5,000 cm ³ / m ² · 24 hrs · 1 atm or more. A storage bag for a plaster printing sheet and a storage method using the storage bag are provided.

In the storage bag and storage method of the present invention,
(1) The film or sheet is made of polyolefin,
Is preferred.

In the storage bag and storage method of the present invention, the film or sheet forming the bag has a carbon dioxide gas permeability of 5,000 cm ³ / m ² · 24 hrs · 1 atm or more, and exhibits a high permeability to carbon dioxide gas. As a result, if the stucco printing sheet printed on this bag is stored and stored, the carbonation of the stucco layer will proceed smoothly, until the stucco layer on which the printed image is formed is completely carbonated. It is possible to effectively prevent the printing surface from being damaged.

It is a perspective view which shows the typical form of the storage bag for plaster printing sheets of this invention.

  With reference to FIG. 1, the storage bag for plaster print sheets of this invention (it shows by 1 as a whole) is formed by bonding the film thru | or sheet | seat arrange | positioned so that it may mutually face in a bag shape. The upper portion has an opening 3 for inserting a stucco printing sheet on which ink jet printing has been performed.

  In addition, the stucco printing sheet | seat in which inkjet printing is given is a thing as disclosed by the patent document 1 mentioned above.

  A folded portion 5 extending upward from the opening 3 is formed on one of the films or sheets facing each other. An adhesive layer 7 is appropriately formed on the folded portion 3 by applying an adhesive known per se (for example, (meth) acrylic resin). The adhesive layer 7 may be made of silicon paper or the like if necessary. A release paper (not shown) is stuck. That is, a stucco printing sheet printed from the opening 3 is inserted, the sheet is accommodated in the bag, the release paper is peeled off, and then the folded portion 5 is folded so as to close the opening 3, and the adhesive layer 7 The folded portion 5 is attached to the surface of the other film or sheet, and the stucco printing sheet is stored in this state.

  For example, when two films or sheets are used, the side edges 1a, 1a, and 1b in FIG. 1 can be bonded by a three-way seal using an appropriate adhesive or heat seal. What is necessary is just to adhere | attach or weld 1a and the bottom edge 1b, and when using one film or sheet | seat, it should just be bent at the bottom edge 1b, and the side edges 1a and 1a should be adhere | attached or welded by a two-way seal. .

In the present invention, the carbon dioxide gas permeability of the film or sheet used for the production of the storage bag 1 is 5,000 cm ³ / m ² · 24 hrs · 1 atm or more, particularly 10,000 cm ³ / m ² · 24 hrs · 1 atm. It is preferable to use the above. As a result, carbon dioxide in the atmosphere flows into the bag at a certain rate and the carbonization of the stucco layer that has not been completely carbonated flows into the bag for a relatively short time (usually about 10 to 15 days). Carbonates and hardens, and exhibits high mechanical strength. For example, a stucco printing sheet that has not been subjected to ink jet printing needs to suppress carbonation, and needs to be packaged using a film that does not transmit carbon dioxide. The film is greatly different from such a film in that a film that easily transmits light is used. The carbon dioxide gas permeability in the present invention is based on the differential pressure method based on JIS K7126-1.

The upper limit of the carbon dioxide gas permeability of the film or sheet to be used is not particularly limited, but if it is excessively large, only the strength of the film or sheet is impaired, and there is no particular merit. Therefore, although depending on the material of the film or sheet, in general, the carbon dioxide gas permeability is preferably 100,000 cm ³ / m ² · 24 hrs · 1 atm or less.

  Further, the film or sheet used for the production of the storage bag 1 is not particularly limited as long as the carbon dioxide gas permeability is within the above range, and may be formed of any plastic or paper, or stretched. It may be unstretched. However, it is desirable that the film or sheet is transparent in that the printed sheet accommodated in the bag 1 can be visually recognized, and further, it is flexible and smooth so as not to damage the stucco layer of the printed sheet when stored. This is preferable. Therefore, from this point of view, it is desirable to form the storage bag 1 using a film or sheet formed of a polyolefin resin, particularly polyethylene or polypropylene. Further, the polyolefin resin bag 1 forms a printed image. There is also an advantage that it is possible to prevent the inconvenience of ink jet ink adhering.

  Incidentally, the carbon dioxide gas permeability can be set within a target range by adjusting the thickness according to the material of the film or sheet. For example, the stretched carbon dioxide gas permeability is higher than the unstretched one. Accordingly, the stretched film or sheet can be made thinner, and the unstretched product can be made relatively thick.

  In the above-described storage bag 1 of the present invention, after the stucco layer of the printing sheet accommodated therein is completely carbonated, the folded portion 5 is peeled off to take out the printing sheet accommodated from the opening 3, and the stucco The printed image formed on the layer will be appreciated, but when the bag 1 is transparent, it is stored as it is even when it is completely carbonated and can be viewed in this state. Of course, once taken out, it can be stored in the bag 1 again.

  According to the storage bag 1 of the present invention, it is possible to effectively suppress damage to the stucco layer after the printed image is formed and until the stucco layer is completely carbonated, and to keep the printed image well. it can.

  The excellent effect of the present invention will be described in the following experimental example. The test methods and materials used in the experimental examples are shown below.

Carbon dioxide gas permeability The measurement was performed using a gas permeability measuring device “GTME 2510” (manufactured by Shimadzu Corporation) based on a differential pressure method based on JIS K 7126-1.

Carbonation rate of the stucco layer By the ignition loss method, calcium hydroxide and calcium carbonate in the stucco layer were quantified, and the rate of change of calcium hydroxide to calcium carbonate was calculated as the carbonation rate.

Stucco printing sheet;
What was produced by manufacture example 1 of patent 5039701 (patent document 1).

Base sheet: Charcoal calcare paper Stucco layer: calcium hydroxide content 60% by weight, thickness 100 μm
Carbonation rate 75%
The surface hardness of the plaster surface was measured using a pencil scratch hardness tester “No. 533-S” (manufactured by Yasuda Seiki Seisakusho) in accordance with JIS K 5600-5-4.

<Example 1>
A polyolefin film having the material and thickness shown in Table 1 was heat-sealed to prepare a storage bag having a length of 350 mm and a width of 230 mm in the same form as the storage bag 1.
Next, a test body having a size of 210 mm × 300 mm, in which yellow was printed by an ink jet printer (manufactured by Epson, model: PX-5600, using water-based ink in which a pigment was dispersed), was prepared using a sheet for plaster printing. The surface hardness immediately after printing was 4B.

  This specimen was put in a storage bag, and the carbonation rate and surface hardness after 15 days were measured. The results are shown in Table 1.

<Comparative Example 1>
Except for using the film having the material and thickness shown in Table 2, the same operation as in the example was performed, and the carbonation rate and surface hardness after 15 days were measured. The results are shown in Table 1.

1: Storage bag 3: Opening 5: Folded part

Claims (3)

A storage bag used for storing a stucco printing sheet on which a printed image is formed on a stucco layer, wherein the film has a carbon dioxide permeability of 5,000 cm ³ / m ² · 24 hrs · 1 atm or more. A storage bag for a plaster printing sheet, which is formed from a sheet.   The storage bag for plaster printing sheets according to claim 1, wherein the film or sheet is made of polyolefin. A method for storing a stucco printing sheet on which a printed image is formed on a stucco layer, the film being formed from a film or sheet having a carbon dioxide gas permeability of 5,000 cm ³ / m ² · 24 hrs · 1 atm or more. The said storage method characterized by storing with the storage bag for the plaster printing sheet which has been carried out.

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