JP3274539B2 - Laminated transparent paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated transparent paper particularly suitable for automatic plotters and copying.

[0002]

2. Description of the Related Art Conventionally, tracing paper or drafting film has been used as automatic plotter paper and copy paper. According to the latest paper processing handbook (edited by Tech Times, issued on August 20, 1988), "Natural Treppe was a tracing paper that considered tracing work and diazo copy work as the original drawing paper in drafting. Tracing paper is transparent paper. The reason why paper is opaque and white is that high quality paper contains about 50% air in its volume. The paper looks white and opaque due to the distribution of the fine voids and the difference in the refractive index between the cellulose fibers and air. There are two types of tracing paper: natural treble and impregnated trepe. Natural trepe is a paper made by highly beating pulp fibers to reduce voids to 15 to 25%. On the other hand, the impregnated trepe is transparent paper obtained by impregnating general high-quality paper with a transparent resin having the same refractive index as that of cellulose. ],

[0003] Further, as a characteristic of trepe, the more the beaten paper, the greater the expansion and contraction of the paper with respect to the humidity change. Particularly, the expansion and contraction in the horizontal direction is large, and the dimensional stability is poor as compared with high-quality paper and impregnated treble. For this reason, curling is likely to occur, and the portion wet with water becomes uneven. Therefore, in the handling of natural treble, it is necessary to pay more attention to the printing operation conditions and the storage of drawings, as compared to other papers, so as not to have a sudden external influence or change in the water content of the paper. In tracing paper, thin articles of 40-60 g / m ² are used for office work, and 55 g / m ² for design drafting and the second original drawing.
m ² or more are used. ],

[0004] The film for the original drawing is a film base (mainly a polyester film) in addition to a paper base.
There is a matted film. Matting includes sand matting and chemical matting. The sand mat is obtained by physically roughening the surface of a polyester film. The chemical mat is obtained by forming a mat surface by coating a polyester film surface. In both cases, an antistatic layer is generally provided on the surface. Film needs for drafting applications are shifting from sand mat films to chemical mat films. ] There is a description.

[0005] In the section of transparent paper in the New Edition Printing Encyclopedia (edited by the Printing Society of Japan, Printing Bureau, Ministry of Finance), "a kind of thin and transparent writing paper. Transparency of the original drawing is used for manuscripts such as the BANDIKE method and blueprint. There are two types. 1) The raw material is beaten to a high degree of viscosity to make it transparent, or processed paper made by coating a mixture of Canadian balsam, turpentine, vegetable oil, etc. on thin paper. 2) Thin-leaf Japanese paper made by the pouring method using KOZO / MITSUMATA. Also called drawing paper. ] There is a description.

[0006] The section on transparent paper in the Paper and Pulp Technology Handbook (1982 by the Japan Pulp and Paper Technology Association) states, "A general term for thin leaves, many types such as dictionary paper, rice paper, type paper, printing paper, etc., and the basis weight is 40 g. / M ² or less, and thin paper Japanese paper is 20 g / m ² or less. ] There is a description.

[0007] Although tracing paper is excellent in writability, its moisture content is liable to change under the influence of temperature and humidity due to the inherent properties of the paper, and has problems in dimensional stability, flatness such as wrinkles and curls, and mechanical strength. Further, when used as a second original sheet, there is a disadvantage that the tear strength and the bending strength are remarkably reduced by heat during the heat fixing in the copying process. On the other hand, although the film has high transparency and excellent dimensional stability and mechanical strength, it does not absorb ink and requires a long time for drying, has poor writing properties, and has poor toner fixability as compared with paper.

[0008] As a method of solving such a disadvantage, for example, Japanese Utility Model Publication No. 3-51171 discloses a matted film or a basis weight of 10 to 40 g /
tracing sheet is laminated to paper m ² are described,
Further, Japanese Patent Publication No. 57-49897 describes a method of impregnating a Japanese paper tracing paper with a resin composition which is substantially cured at 120 ° C. for 5 minutes or less, and further disclosed in Japanese Patent Publication No. Sho 62-28465. Describes a method of laminating ultra-thin paper on both sides of a transparent synthetic resin film and impregnating the ultra-thin paper with a thermoplastic synthetic resin.
Japanese Patent No. 18200 describes a method of laminating Japanese paper on one side or both sides of a plastic film via an adhesive and performing a super calender treatment.

However, a film having a mat on both sides of a transparent film or paper having a basis weight of 10 to 40 g / m ² and, if necessary, a transparentizing agent such as a resin described in Japanese Utility Model Publication No. 3-51171 is disclosed. The main purpose of the tracing sheet to which the impregnated paper is to be bonded is to eliminate the problem of erasure of writing and erasure of printing at the time of correction because all printing is applied to the inside of the lamination and does not appear on the surface And
The drawback is that blisters occur between the film and the paper during thermal fixing due to insufficient adhesive strength of the printed part applied inside when the toner is thermally fixed when copying on this tracing sheet with an electrophotographic copying machine. is there.

Japanese Patent Publication No. 57-49897 describes a method of impregnating Japanese paper tracing paper with a resin composition which is substantially cured at 120 ° C. for 5 minutes or less. It is related to the base paper, and does not consider automatic plotter paper.In other words, when impregnated with synthetic resin, the paper surface becomes hard and loses hydrophilicity, so writing with a pencil mainly used in automatic plotters In terms of the properties, the written line is not sharp, and furthermore, the amount of pencil loss is large, and there is a defect that the stain on the paper due to dusting of the sharpened pencil becomes remarkable. In addition, the writing performance of the water-based pen has poor ink absorbency, and has a defect that the written line is not sharp due to bleeding and poor drying of the ink.

Japanese Patent Publication No. Sho 62-28465 discloses that ultra-thin paper is bonded to both sides of a transparent synthetic resin film, and the ultra-thin paper is impregnated with a thermoplastic synthetic resin to reduce the surface electric resistance to 10 ⁹ to 10. There is a description of a drawing paper suitable as an electrophotographic copying paper for the second original drawing by a method of making it ¹⁰ Ω. Further, if the amount of attached thermoplastic synthetic resin is less than 1 g / m ² per unit area, the transparency of ultra-thin paper is If it exceeds 5 g / m ² , the paper fibers of the ultra-thin paper are coated with the resin, as if the film were laminated on the ultra-thin paper, and the properties of the paper were lost. The attached amount of the thermoplastic synthetic resin is set to 1 to 5 g / m ² , and is partially covered. Based on these facts, this patent does not consider automatic plotter paper, that is, paper made by highly beating pulp like tracing paper becomes a dense paper layer and many fibers are bonded together. Although the surface strength is high, the ultra-thin paper mentioned here can be impregnated with resin, so the paper layer is coarse and the bonding between fibers is small, the surface strength is weak, and the thermoplastic synthetic resin 1 to 5 g / m ²
If the grid is only partially covered, recent high-speed grid roller type automatic plotters have a problem that the strength of the paper pressed by the grid roller is insufficient, the paper breaks, and the paper falls off the plotter. There is. Further, since the amount of the attached thermoplastic synthetic resin is partially covered with 1 to 5 g / m ² , the water-based ink is absorbed in the paper fiber portion when writing, and the portion covered with the thermoplastic synthetic resin is used in the writing. The water-based ink is repelled, and there is a problem that writing unevenness is remarkably generated. In addition, there is a problem that, in a portion of the paper fiber that is not covered with the thermoplastic synthetic resin, a portion written by a pen becomes sticky.

Japanese Patent Application Laid-Open No. 4-18200 describes a recording paper characterized in that Japanese paper is laminated on one or both sides of a plastic film via an adhesive, and supercalendering is performed before or after lamination. However, due to the manufacturing method, the paper layer is not dense, and the superficial calender treatment is used as described in this patent to change the existing state of surface fibers from rough to flat. Although the super calendar can improve the surface properties of the paper, the paper layer is not as dense as natural paper like a natural trepe, so a copy was made on this recording paper with an electrophotographic copying machine. later,
If the correction is made with a toner correcting liquid to correct the copy surface, toner particles are mixed into the fibers of the paper layer, making it difficult to completely erase the toner particles.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to solve these drawbacks, and a laminating method having both the writability of paper, the dimensional stability not affected by the humidity of the film and the transparency. The purpose is to provide transparent paper.

Another object of the present invention is to prevent the occurrence of blisters between the film and the paper when the toner is thermally fixed when performing copying with an electrophotographic copying machine, and to provide good toner correction after copying. It is an object of the present invention to provide a laminated transparent paper that can be printed at a high speed and can be printed at a high speed even with fine lines.

[0015]

Means for Solving the Problems That is, the present invention is in the laminating paper laminated transparent paper via an adhesive on both surfaces of a transparent polyester film, the transparent paper freeness 100
ml (csf) basis weight, prepared using a beaten cellulose fibers below the at 30 g / m ² or less, Oken type air permeability
500 to 500,000 seconds, transparency is 70% or more , and the thickness of the polyester film is 9 to 25 μ, preferably 12 to 25 μm.
The laminated transparent paper has a thickness of 16 μm and the transparency of the laminated transparent paper is 55% or more, more preferably 60% or more.

If the thickness of the polyester film used in the present invention is less than 9 μm, the dimensional stability is poor, and the polyester film may be broken when writing with a pencil on a pen plotter. On the other hand, when the thickness is more than 25 μm, the thickness after lamination with the transparent paper becomes thick, the flexibility of the paper is lost, the adhesion with the diazo paper is poor at the time of blue printing, and the blue printing becomes unclear, which is not preferable. .

For use in electrophotographic copying machines, the polyester film has excellent heat resistance, an area shrinkage at 220 ° C. of 10% or less, and a wetting index of 45 dyne / c.
It is preferable to use a polyethylene terephthalate film having a thickness of 9 to 25 μm or more. If the area shrinkage of the polyester film at 220 ° C. is greater than 10% and the wetting index is less than 45 dyne / cm, the transparent paper bonded to the film at the time of thermal fixing of the toner when copying with an electrophotographic copying machine is used. Blisters tend to occur between them.

For bonding the polyester film and the transparent paper, a known laminating method using an adhesive is applied.
Adhesives include urea resin adhesives, melamine resin adhesives, phenolic adhesives, resorcinol adhesives,
Epoxy adhesive, polyurethane adhesive, polyester adhesive, vinyl acetate adhesive, ethylene / vinyl acetate adhesive, acrylic adhesive, cyanoacrylate adhesive, copolymerized nylon adhesive, and modified rubber adhesive An adhesive is used, and a polyurethane-based adhesive is preferably used in view of adhesive strength, heat resistance, and the like. When it is desired to avoid yellowing due to ultraviolet rays, a polyurethane-based adhesive using an aliphatic isocyanate curing agent can be used.

The transparent paper to be bonded to the polyester film is a natural type transparent paper produced using cellulose fibers beaten to a freeness of 100 ml (csf) or less, having a basis weight of 30 g / m ² or less and a transparency of 30%. 70% or more. The freeness of the pasted transparent paper is 100ml (cs
If it is larger than f), the paper layer is not dense, the surface strength is weak, and the transparency is low at less than 70%. If the surface strength is weak after lamination, the high-speed grid roller type automatic plotter will not have enough strength of the paper pressed by the grid roller, causing the paper to tear and dropping from the plotter. There is a problem of fluffing of the part written in. As a result, the transparency does not exceed 55%, and clear blue printing at a high speed is not expected.

When the basis weight is more than 30 g / m ^2, the thickness after laminating with the polyester film becomes thick, the flexibility of the paper is lost, the adhesion to diazo paper is poor at the time of blue printing, and the blue printing becomes unclear. This is not preferred. In addition, for electrophotographic copying machines, the Oken type air permeability is 500 ~
It is preferable to use 500,000 seconds, preferably 500 to 100,000 seconds, and more preferably 500 to 10,000 seconds of transparent paper. If the Oken-type air permeability is less than 500 seconds, the paper layer is coarse, so that the toner penetrates into the paper layer at the time of erasing the toner, resulting in poor toner erasability. 5
The air permeability is reduced for more than 100,000 seconds, and blisters are easily generated between the film and the laminated transparent paper at the time of thermal fixing of the toner when copying on the laminated transparent paper in the electrophotographic copying machine.

When the smoothness of the surface of the laminated paper, in which the transparent paper is laminated on both sides of the transparent polyester film via an adhesive, is low and less than 40 seconds, the writing property with a pencil mainly used in an automatic plotter is used. In, the written line does not become sharp, furthermore, there is a defect that the amount of pencil loss is large, and the stain on the paper due to the sharpening of the sharpened pencil becomes remarkable.
The writing quality of the water-based pen has a defect that the written line is not sharp. Conversely, if the smoothness is high and exceeds 90 seconds, the writing performance with a pencil has a defect that the line slipped by the pencil is thinned and the thin line is not sharp. If the thickness of the laminated paper, which is made by laminating a transparent paper on both sides of a transparent polyester film via an adhesive, is thin and less than 60μ, it may be broken at the time of writing with an automatic plotter, and it is thin and weak. When copying with an electrophotographic copying machine or a blue printer, a paper jam occurs. Conversely, thick 9
If it exceeds 0μ, it is thick and stiff, so paper jams may occur when copying with electrophotographic copiers and blue printers.At the time of blue printer, the adhesion between the laminated paper and diazo paper may be poor. Blue roasting may be unclear.

[0022]

EXAMPLES The present invention will be described in detail below with reference to examples, but is not limited thereto.

The measurement of data in the embodiment is performed by the following method. (1) Dimensional stability: Two samples at a temperature of 20 ° C and a humidity of 6
Control the humidity for at least 24 hours in a 5% environment, and accurately measure the length of each sample. One of them is at 20 ° C and 45 humidity.
% For at least 24 hours, and the other is at a temperature of 20%.
Humidity was controlled for 24 hours or more in an environment of 85% C. and 85% humidity, and the length of each sample was similarly measured accurately.
With respect to the original size measured and controlled for 24 hours or more in an environment of 5%, the absolute value of the expansion and contraction of the absolute value was measured in the transverse direction of the paper to determine the dimensional stability. (2) Strength: Measured according to JIS P 8116-76 tear strength test method for paper and paperboard. (3) Blister at the time of copying: A-0 size sample was copied by FUJI XEROX 5080 with the fuser scale set to 3, 10 sheets each, and the number of generated blisters was measured and compared. (4) Toner erasability: FUJI XEROX 5080
Then, the copied portion was rubbed with felt impregnated with benzyl alcohol, and then the toner dissolved in benzyl alcohol was wiped off with a tissue paper, and further erased with an eraser, and the portion was compared with the portion not copied. In the table, ○ is good, △ is slightly poor,
× indicates failure. (5) Plotter aptitude (pencil writing): A pencil lead of 0.3 mm was written with HB using XP700 manufactured by Mutoh Kogyo Co., Ltd., and the written lines were compared for blurring, powder dropping, and tearing. In the table, ○ indicates good, Δ indicates acceptable, and × indicates unacceptable. (6) Suitable for plotter (water-based pen): Graphtec
With MP5300, writing was performed using an ink pen, and the written lines were compared for blurring, bleeding and drying property. In the table, ○ indicates good, Δ indicates acceptable, and × indicates unacceptable. (7) Transparency: expressed by 100- (Hunter opacity value). The hunter opacity value is defined by JIS P 81
The opacity (%) measured at 38. (8) Thickness: JIS P 8118 Measured by a test method for the thickness and density of paper and paperboard. (9) Smoothness: Measured by a smoothness test method using a Beck tester for JIS P 8119 paper and paperboard. (10) Blue printing suitability: RICOPY manufactured by Ricoh Co., Ltd.
In PL5010, XP70 manufactured by Mutoh Kogyo Co., Ltd.
Each of the A-0 size samples written at 0 was copied 10 sheets at a time, and the background dirt, the sharpness of the written lines, the white spots, etc. were comprehensively evaluated. ○ indicates good, △ indicates acceptable, ×
Indicates not possible.

Example 1 One side of a PET film (H500, manufactured by Diafoil Hoechst Co., Ltd.) having a thickness of 16 μm, an area shrinkage at 220 ° C. of 8.4%, and a wetting index of 50 dyne / cm was adhered with the following composition. After applying the agent, the solvent was removed with a dryer. The solid content of the adhesive applied at that time was 4.7 g / m ² . Oken-type air permeability manufactured using cellulose fibers beaten to the surface and a freeness of 90 ml has a basis weight of 150,000 seconds and a basis weight of 1
The back surface of a transparent paper having a transparency of 5 g / m ² and a transparency of 77% was laminated by a dry lamination method. The same process was performed on the opposite surface to obtain a laminated transparent paper. Tables 1 and 2 show the measurement results. Adhesive composition 100 parts by weight of Seikabond E-285B manufactured by Dainichi Seika Kogyo Co., Ltd. 10 parts by weight of Seikabond C-75N manufactured by Dainichi Seika Kogyo Co., Ltd. 100 parts by weight of ethyl acetate

Example 2 In place of the transparent paper used in Example 1, the Oken type air permeability was 35.
The procedure was performed in the same manner as in Example 1 except that transparent paper having a basis weight of 25 g / m ^{2 in} 10,000 seconds was used. Tables 1 and 2 show the measurement results.

Example 3 In place of the transparent paper used in Example 1, the Oken type air permeability was 45.
The same operation as in Example 1 was performed except that transparent paper having a basis weight of 30 g / m ² for 10,000 seconds was used. Tables 1 and 2 show the measurement results.

Comparative Example 1 Instead of the transparent paper used in Example 1, the Oken type air permeability was 50.
The procedure was performed in the same manner as in Example 1 except that transparent paper having a basis weight of 35 g / m ² exceeding 10,000 seconds was used. Tables 1 and 2 show the measurement results.

Comparative Example 2 The same data as in Example 1 was measured for a sheet in which a resin-impregnated paper was attached to both sides of a commercially available PET film having a thickness of 16 μm. The results are shown in Tables 1 and 2.

Comparative Example 3 Tables 1 and 2 show the measurement results of sheets obtained by laminating a resin-impregnated Japanese paper on both sides of a commercially available film.

Comparative Example 4 Tables 1 and 2 show the measurement results of DX tracing paper N75: natural trepe manufactured by Mitsubishi Paper Mills, Ltd.

Comparative Example 5 Tables 1 and 2 show the measurement results of a commercially available chemical mat.

COMPARATIVE EXAMPLE 6 Instead of the transparent paper used in Example 1, a cellulose fiber beaten to a freeness of 150 ml was used, and the Oken type air permeability was 400 seconds, the transparency was 30 g / m ² and the basis weight was 30%. The operation was performed in the same manner as in Example 1 except that 68% of transparent paper was used. Tables 1 and 2 show the measurement results.

[0033]

[Table 1]

[0034]

[Table 2]

Example 4 The film used in Example 1 was replaced with a film having a thickness of 12 μm and a film thickness of 22 μm.
The area shrinkage at 0 ° C. is 8.4% and the wetting index is 50 dy.
The procedure was performed in the same manner as in Example 1 except that a ne / cm PET film (H500 manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

Example 5 The film used in Example 2 was replaced with a film having a thickness of 12 μm and a film thickness of 22 μm.
The area shrinkage at 0 ° C. is 8.4% and the wetting index is 50 dy.
Example 2 was repeated except that a ne / cm PET film (H500 manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

Example 6 The film used in Example 3 was replaced with a film having a thickness of 12 μm and a film thickness of 22 μm.
The area shrinkage at 0 ° C. is 8.4% and the wetting index is 50 dy.
Example 3 was carried out in the same manner as in Example 3 except that a ne / cm PET film (H500, manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

Example 7 Instead of the transparent paper used in Example 4, using a cellulose fiber beaten to a freeness of 100 ml, the Oken type air permeability was 500 seconds, and the transparency was 15 g / m ² and the basis weight was 15%. The operation was performed in the same manner as in Example 4 except that 70% of transparent paper was used. The measurement results are shown in Tables 3 and 4.

Example 8 The film used in Example 1 was replaced with a film having a thickness of 16 μm and a thickness of 22 μm.
The area shrinkage at 0 ° C. is 11.1% and the wetting index is 42 d.
The same procedure as in Example 1 was performed except that a PET film of yne / cm (G130 manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

Comparative Example 7 The film used in Example 1 was replaced with an 8 μm thick 220
The area shrinkage at 8.4% is 8.4% and the wetting index is 50 dyn.
The procedure was performed in the same manner as in Example 1 except that an e / cm PET film (H500 manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

Comparative Example 8 The film used in Example 5 was replaced with a film having a thickness of 30 μm and a thickness of 22 μm.
The area shrinkage at 0 ° C. is 8.4% and the wetting index is 50 dy.
The same procedure was performed as in Example 5 except that a ne / cm PET film (H500 manufactured by Diafoil Hoechst Co., Ltd.) was used. The measurement results are shown in Tables 3 and 4.

[0042]

[Table 3]

[0043]

[Table 4]

Example 9 Instead of the transparent paper used in Example 5, the Oken type air permeability was 28.
10,000 seconds, smoothness is 40 seconds, basis weight is 25 g / m ² and transparency is 76
%, Except that transparent paper was used. Tables 5 and 6 show the measurement results.

Example 10 Instead of the transparent paper used in Example 5, the Oken type air permeability was 43.
Smoothness of 10,000 seconds, 90 seconds, basis weight of 25 g / m ² and transparency of 78
%, Except that transparent paper was used. Tables 5 and 6 show the measurement results.

Example 11 Instead of the transparent paper used in Example 5, the Oken type air permeability was 30.
Smoothness of 10,000 seconds, 35 seconds, basis weight of 25 g / m ² and transparency of 76
%, Except that transparent paper was used. Tables 5 and 6 show the measurement results.

Example 12 In place of the transparent paper used in Example 5, the Oken type air permeability was 40.
Smoothness of 10,000 seconds, 95 seconds, basis weight of 25 g / m ² and transparency of 78
%, Except that transparent paper was used. Tables 5 and 6 show the measurement results.

[0048]

[Table 5]

[0049]

[Table 6]

[0050]

According to the laminated tracing paper of the present invention, the polyester film and the transparent paper are laminated with an adhesive, so that they have excellent dimensional stability, strength and toner fixability, and can be used with an aqueous pen. The paper surface has an appropriate cushioning property, has good pencil writing properties, has good ink absorbency and good printing properties, and has the effect of suppressing the occurrence of blisters on the adhesive surface.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Keita Takesue 6-26 Akebonocho, Toyama City, Toyama Pref. Terada Mansion Examiner Hiroaki Hirai (56) References JP-A-4-73298 (JP, A) JP-A-2 −161450 (JP, A) Actually open 1979-131577 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 D21H 11/00-27/42

Claims (4)

(57) [Claims] 1. A laminated paper in which transparent paper is laminated on both sides of a transparent polyester film via an adhesive,
The basis weight of the transparent paper manufactured using cellulose fibers beaten to a freeness of 100 ml (csf) or less is 30 g / m ^2.
Below, the Oken type air permeability is 500-500,000 seconds and the transparency is 7
0% or more , and the thickness of the polyester film is 9 to 2%.
A laminated transparent paper characterized by having a thickness of 5 μ and a transparency of the laminated paper of 55% or more. 2. A polyester film in an area shrinkage at 220 ° C. with excellent heat resistance more than 10%, and laminating a transparent sheet of claim 1, wherein wetting index is polyethylene terephthalate film above 45 dyne / cm. 3. A surface smoothness of 40 to 90 seconds and a thickness of 6
Claim 1 or 2 laminating transparent paper according a 0～90Myu. 4. The basis weight of the transparent paper to be pasted is 15 to 25.
g / m ² , the thickness of the polyester film is 12 to 16 μm
The laminated transparent paper according to claim 1, 2, or 3 .