JP3002455B1 - Recording sheet - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a recording sheet for ink jet printing in color for a personal computer printer, which has a high transfer speed, uses a relatively small amount of ink, and has excellent color tone and sharpness of a printed image. Provide a sheet. SOLUTION: In a recording sheet having a sheet substrate 1, a support layer 2 formed on an upper surface of the sheet substrate 1, and an ink absorbing layer 3 formed on an upper surface of the support layer 2, The support layer 2 and the ink absorbing layer 3 each include at least a porous inorganic fine powder for absorbing and fixing ink and a binder or an adhesive.
Is larger than the binder or the adhesive forming the ink absorbing layer 3, and the inorganic fine powder forming the ink absorbing layer 3 is the inorganic fine powder forming the support layer 2. Have more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording sheet in which an ink-absorbing layer mainly composed of an inorganic powder and a binder is formed on the surface side of a cloth sheet substrate, particularly a recording sheet suitable for ink-jet printing. About. The recording sheet according to the present invention is used for outdoor advertisements, interior decorations, duplicates, or personal computer printers on which color printing by an ink jet method has been performed.

[0002]

2. Description of the Related Art Examples of such recording sheets for ink jet printing include those disclosed in JP-A-7-266690 and JP-A-10-29370. A recording sheet for inkjet printing disclosed in JP-A-7-266690 has a laminated structure including a base fabric, an adhesive layer, and a coating layer, wherein the coating layer has an inorganic powder and a cationic polymer resin. It is characterized by having. Also,
The recording sheet for ink jet printing disclosed in JP-A-10-29370 has a structure in which an ink absorbing layer composed of an inorganic filler and a binder is laminated on a fiber base material, and an image hiding layer is laminated on the back surface with an adhesive layer interposed therebetween. It is characterized by being.

[0003]

However, the recording sheet for ink-jet printing has a problem that lines or images have blurred outlines and lack sharpness. This is probably because the printing ink is rapidly absorbed and diffused in the surface direction of the sheet. In addition, when a conventionally available recording sheet is used for inkjet printing,
There are problems that the transfer speed (drying of the ink) is slow, the amount of ink used is very large, and the color tone of the printed image is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and as a recording sheet for color inkjet printing such as for a personal computer printer, the transfer speed is high.
It is an object of the present invention to provide a recording sheet that uses a relatively small amount of ink and has good color tone and clearness of a printed image, that is, all of the above-described conventional problems.

[0005]

In order to solve the above-mentioned conventional problems, in the recording sheet according to the first aspect, as shown in FIG. 1, a sheet base 1 and a top surface of the sheet base 1 are formed. In a recording sheet having a support layer 2 formed as described above and an ink absorbing layer 3 formed on the upper surface of the support layer 2, the support layer 2 and the ink absorbing layer 3 absorb and fix ink, respectively. At least a porous inorganic fine powder to be made and a binder or an adhesive, the amount of the binder or the adhesive forming the support layer 2 is larger than the amount of the binder or the adhesive forming the ink absorbing layer 3, and The inorganic fine powder forming the ink absorbing layer 3 has a larger amount than the inorganic fine powder forming the support layer 2. At least a part of the binder or the adhesive contained in the support layer 2 and the ink absorbing layer 3 is common. The inorganic fine powder contained in the support layer 2 and the ink absorbing layer 3 is mainly made of clay powder and silica gel and is common.

Next, in the recording sheet according to the second aspect, the sheet substrate 1, the support layer 2 formed on the upper surface of the sheet substrate 1, and the ink formed on the upper surface of the support layer 2 In the recording sheet having the absorbing layer 3, the sheet substrate 1
Is formed of a woven fabric made of wooly yarn of polyester filament, and the support layer 2 and the ink absorbing layer 3
Means that a porous inorganic fine powder for absorbing and fixing an ink made of clay powder or silica gel having a particle size of micron order, and an ink absorbing layer 3 are bonded to the sheet substrate 1 via the support layer 2. The support layer 2 has at least a binder or an adhesive such as ponyvinyl alcohol and acrylate ester having a function as a binder, and the support layer 2 has vinyl acetate as an adhesive. The amount of the binder or the adhesive forming the body layer 2 is larger than the amount of the binder or the adhesive forming the ink absorbing layer, and the inorganic fine powder forming the ink absorbing layer 3 is the inorganic fine powder forming the support layer 2. It is characterized by having a large amount of particles having a particle diameter of several microns smaller than the fine powder.

[0007] In the recording sheet according to claim 1 or 2,
It is desirable that the ink absorbing layer 3 and / or the support layer 2 have a relatively small amount of a water-proofing agent and a dispersant.

[0008]

According to the recording sheet, the ink absorbing layer 3
And the support layer 2 are similar in composition and structure. The same inorganic powder and binder as those of the ink absorbing layer 3 are mixed with the support layer 2 mainly for the purpose of bonding to the sheet substrate. As a result, the ink absorption layer retains and blocks the ink, and achieves the appropriate permeability of the ink to the support layer. Printing was enabled.

[0009]

FIG. 1 is a schematic structural view of a recording sheet for ink jet printing according to an embodiment of the present invention. As shown in FIG. 1, the recording sheet has an ink absorption layer 3 formed on a top surface of a sheet substrate 1 as a base cloth via a support layer 2. The configuration and function of each layer will be described below.

(1) As a cloth to be the sheet substrate 1, a woven cloth formed of polyester filament yarn having the following structure in consideration of printability, strength, and adhesion to the ink absorbing layer support. Using. Polyester filament 10
Woven fabric with 0% yarn is a long fiber, has almost no seams, fuzz or fine hair, and has a surface smoothness suitable for printing that is closer to paper than other synthetic fiber cloths and natural fiber cloths. Enables sharp images and intensity. In the present invention, a wooly processed yarn was used. Woolly processing means that the yarn is first twisted to the right (or left), heated, twisted, and then twisted to the left (or right), and then heated and set. A high fiber space is formed, the penetration of the binder of the ink absorbing layer support to the fiber surface (anchoring effect) is enhanced, and the adhesion is strengthened. further,
By performing the fluorescent exposure (exposure with a fluorescent dye), the whiteness of the cloth is significantly increased, and the sharpness of the image color development is enhanced.

(2) Function and structure of ink-absorbing layer support as support layer 2 This support is located between the ink-absorbing layer and the sheet base material (base fabric), and serves as a medium in which both are in close contact with each other. This has the purpose of avoiding the ink smoothness, ink strike-through, and image expansion. The composition structure of the support is as follows. Inorganic fine powder About 30 parts by weight to about 40 parts by weight (clay powder about 10 parts by weight) (silica gel about 25 parts by weight) Binder (or adhesive) about 60 parts by weight to about 70 parts by weight (polyvinyl alcohol about 20 parts by weight) (Acrylic ester approximately 10 parts by weight) (Vinyl acetate approximately 32 parts by weight) Dispersant approximately 0.5 parts by weight Waterproofing agent approximately 0.5 parts by weight Clay powder as inorganic fine powder, porous powder of silica gel It is effective to use particles having a particle size of about 1 μm to about 30 μm. The support had a higher specific gravity in the binder section in order to withstand external pressure such as bending peeling and water resistance and to secure an ink absorbing layer. In addition, by the closeness of the composition structure with the ink absorbing layer, the ink can be retained and blocked in the absorbing layer, and the ink can be appropriately transmitted to the support, so that a very reasonable amount of ink can be used. Was completed.

(3) Function and Configuration of Ink Absorbing Layer 3 Inorganic fine powder in which an ink absorbing layer support is formed on a polyester filament cloth as a sheet substrate and an ink absorbing layer having the following composition is further formed thereon Approximately 50 parts by weight to approximately 60 parts by weight (clay powder approximately 20 parts by weight) (silica gel approximately 35 parts by weight) Binder (or adhesive) approximately 40 parts by weight to approximately 50 parts by weight (polyvinyl alcohol approximately 25 parts by weight) (acrylic) Acid ester about 20 parts by weight) Adsorbent about 3 parts by weight (modified polyamine resin about 3 parts by weight) Dispersant about 0.5 part by weight Waterproofing agent about 0.5 part by weight The ink absorbing layer has a color development and drying speed of ink. And three points of a clear image. The particle size of the porous powder is preferably smaller than that of the porous powder in the support.
Degree) is preferable.

As described above, the composition ratio of the binder or the adhesive contained in the support layer 2 to the binder or the adhesive contained in the ink absorbing layer 3 is about 6 to 7: about 4 to
Since the support of No. 5 and the undercoat was formed in a binder-rich manner, the ink absorbing layer increased the composition ratio of the particle dispersion, and enabled the above three points.

[0014]

EXAMPLE A support having the following composition was applied to the upper surface of the above-mentioned polyester woven fabric (sheet base material) to form a support layer.
An ink-absorbing layer having the following composition was applied on the upper surface to form a layer. Composition of support Clay powder 10 parts by weight Silica gel 25 parts by weight Polyvinyl alcohol (PVA217, Kuraray Co., Ltd.) 20 parts by weight Acrylic acid ester (Showa Kogyo Co., Ltd.) 10 parts by weight Vinyl acetate (Polysol 1314, Showa Kogyo Co., Ltd.) 32 parts by weight Part Dispersant (Orotan 731DP, Rohm and House) 0.5 part by weight Waterproofing agent (S1-617, Japan PMC) 0.5 part by weight Clay powder, porous silica gel powder has a particle size of approximately 1 to 1. 3
Those between 0μ were used. Composition of ink absorbing layer Clay powder 20 parts by weight Silica gel 35 parts by weight Polyvinyl alcohol (PVA217, Kuraray Co., Ltd.) 25 parts by weight Acrylic ester (Showa Kogyo Co., Ltd.) 20 parts by weight Modified polyamine resin (Showa Kogyo Co., Ltd.) 3 parts by weight Dispersant (Orotan 731DP, Rohm and House) 0.5 part by weight Waterproofing agent (S1-617, Japan PMC) 0.5 part by weight Clay powder and silica gel porous powder have a particle size of about 1-3.
Those between μ were used.

When the recording sheet according to the above embodiment was subjected to curler printing by an ink jet method using a personal computer printer, three points of color development, drying speed, and clear image of the ink were obtained. Satisfactory results were obtained with the problem solved.

[0016]

According to the recording sheet of the present invention, as described above, the ink absorbing layer 3 and the support layer 2 are similar in composition and structure, and mainly have an adhesive function with the sheet substrate. The same inorganic powder and binder as in the ink absorbing layer 3 were mixed in the supporting layer 2 for the purpose of the above, so that the retention and blocking of the ink in the ink absorbing layer and the appropriate permeability of the ink to the supporting layer were achieved. , Which enabled extremely reasonable use of ink and color printing by the sharp and sharp inkjet method.

Further, by forming the sheet base material 1 from a woven fabric made of wooly yarn of polyester filament, permeation (anchoring effect) of the binder of the ink absorbing layer support to the fiber surface is enhanced, and the adhesion is strengthened. Therefore, despite the structure having an inorganic powder having an ink absorbing function in the support as an adhesive layer, there is no problem that the structure is stable and the image is easily peeled off. Further, by performing the fluorescence exposure (exposure with a fluorescent dye), the whiteness of the cloth is extremely increased, and the sharpness of the color development of the image can be enhanced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a schematic structure of a recording sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet base material 2 Support layer 3 Ink absorption layer

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-282966 (JP, A) JP-A-5-96844 (JP, A) JP-A-7-89216 (JP, A) JP-A 8- 187934 (JP, A) JP-A-8-337999 (JP, A) JP-A-8-311784 (JP, A) JP-A-6-79967 (JP, A) JP-A-7-17125 (JP, A) JP-A-9-86032 (JP, A) JP-A-10-297079 (JP, A) JP-A-10-315610 (JP, A) JP-A-11-20301 (JP, A) JP-A-10-203008 (JP, A) JP-A-10-264507 (JP, A) JP-A-7-266690 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/00

Claims (3)

(57) [Claims] 1. A recording sheet comprising: a sheet substrate; a support layer formed on an upper surface of the sheet substrate; and an ink absorbing layer formed on an upper surface of the support layer. And the ink absorbing layer , respectively,
Approximately, clay powder and silica gel to absorb and fix ink
At least partially supporting the inorganic fine powder consisting mainly of Le
It has a binder or an adhesive common to the body layer side and the ink absorbing layer side, and the inorganic fine powder forming the ink absorbing layer has a larger amount than the inorganic fine powder forming the support layer. In addition, the support layer has a larger amount of a binder or an adhesive for fixing the ink absorbing layer to the sheet substrate via the support layer than the binder or the adhesive in the ink absorbing layer. A recording sheet comprising: a recording sheet; 2. A recording sheet comprising a sheet substrate, a support layer formed on the top surface of the sheet substrate, and an ink absorbing layer formed on the top surface of the support layer, wherein the sheet substrate Is formed by a woven fabric of wooly yarn of polyester filament, and the support layer and the ink absorbing layer are each composed of
Approximately, clay powder and silica gel that absorb and fix ink consisting of silica gel etc.
Inorganic fine powder mainly and at least a part thereof such as ponivinyl alcohol and acrylate ester are used as a support layer.
Has a common binder or adhesive and a relatively small amount of a waterproofing agent and a dispersant on the side and the ink absorbing layer side ,
Further, the support layer has vinyl acetate as an adhesive, the binder or the adhesive forming the support layer is larger in amount than the binder or the adhesive forming the ink absorbing layer, and A recording sheet, wherein the inorganic fine powder forming the ink absorbing layer has a large amount of fine particles having a smaller particle diameter than the inorganic fine powder forming the support layer. 3. The method according to claim 1 , wherein the inorganic fine powder is substantially
30 to 40 parts by weight and the binder
Chromatography or adhesive has about 60 parts by weight to approximately 70 by weight part,
The ink absorbing layer contains approximately 50 parts by weight of the inorganic fine powder.
About 60 parts by weight and the binder or
That the adhesive has about 40 parts by weight to about 50 parts by weight.
The recording sheet according to claim 1, wherein: