JPH0473298A - Transparent paper for second original drawing - Google Patents

Abstract

PURPOSE:To obtain the title transparent paper useful for electrophotographic copying machine of toner fixation type by heat roll free from flapping cockle even in preparation of second original drawing in a wound state by using beaten cellulose fibers and specifying specific weight, transparency and water content. CONSTITUTION:The objective transparent paper which is produced by using cellulose fibers beaten into <=100 cc, preferably <=50 cc Canadian standard freeness (C.S.F) and has 50-100 g/m<2>, preferably 60-90 g/m<2> weight, >=50 %, preferably >=60 % transparency and 8.0-12.0 % water content in paper.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a second original transparent paper used in a rolled form, and more particularly to a second original transparent paper used in an electrophotographic copying machine that uses a heat roll to fix toner. .

[Conventional technology]

Conventionally, as transparent paper for second original drawings, for example,
No. 38729, No. 46-15723, No. 52-314
Tracing paper produced by highly beating cellulose fibers as described in Japanese Patent Publication No. 45, and beating cellulose fibers as described in Japanese Patent Publication Nos. 54-6645 and 56-6650. Transparencies were used that were manufactured in a less advanced manner and treated with a clarifying agent. In particular, tracing paper has excellent erasability of heat-fixed toner images and retouchability with a writing instrument for drawings (second original drawings) copied using an electrophotographic copying machine that uses a heat roll to fix the toner. It is often used in the drafting field because of its weight, especially with a basis weight of 60 to 90 g.
/n(, transparency is 50% or more, and moisture content is 5.0-8
．． 0% was used.

Problems to be Solved by the Invention However, the above-mentioned tracing paper (hereinafter referred to as transparent paper) cannot be used in an electrophotographic copying machine that uses a heat roll to fix toner. When paper is passed in the same direction, especially when used in a rolled form to create a second original, it is recommended to feed the paper in the direction of the paper along the grain of the paper for 3 to 10 minutes.
Wavy wrinkles with mm intervals often occurred. When a diazo copy is made using a diazo copying machine using the second original drawing with these wavy wrinkles, the alignment of the second original drawing and the diazo copy paper is poor, resulting in missing images such as letters and lines.
Since blurring occurs, there is a practical problem as a second original paper. Therefore, currently, when transparent paper is used as the second original paper in an electrophotographic copying machine that uses a heat roll to fix the toner, the transparent paper is made into a cut-size shape to prevent the occurrence of wavy wrinkles. . As is well known, an electrophotographic copying machine forms a latent image on a photosensitive drum, develops it with toner, and then transfers the toner image to paper. Paper and toner are heated using a toner fixation method using a heat roll, and the toner is fixed on the paper to obtain an image. The electrophotographic copying machine used to create the second original drawing is
In recent years, machines have become larger and faster, and the heat roll method, which used to be the mainstream method for toner fixing in small machines, is superior in terms of safety, high speed, compactness, and cost. It has also begun to be adopted in large aircraft. A large electrophotographic copying machine that uses a heat roll to fix toner constantly requires high speed and excellent workability due to its development purpose, so it was also required to be able to use transparent paper in a rolled form. . SUMMARY OF THE INVENTION An object of the present invention is to provide a transparent paper from which a high-quality second original image without waviness can be obtained even when used in a rolled form. [Means for Solving the Problems] As a result of extensive research, the present inventors have created a second original using an electrophotographic copying machine with a fixed toner fixation method using a heat roll, using a roll-shaped transparent paper. When making transparent paper, by using transparent paper with a moisture content of 8.0 to 12°0%, even if the paper is fed in the same direction as the direction of paper movement and the paper flow direction, Good second layer with no wavy wrinkles
It was discovered that the original map can be obtained. That is, in the process of producing transparent paper by highly beating cellulose fibers, the present invention reduces the moisture content of transparent paper to 8.0 to 8.0.
12.0%, and an electrophotographic copying machine with a fixed toner fixation method using a heat roll can
When creating the original drawing, it is designed so that wavy wrinkles will not occur even if it is used in rolled form. The moisture content of the second transparent paper for original drawings of the present invention is considerably higher than that of conventional transparent paper for drafting, etc., and is 8°0 to 12.0°.
%, preferably 8.5 to 11.0%. Moisture is 8.
If the moisture content is less than 0%, the effect of preventing wavy wrinkles is small, while if the moisture content is 12.0% or more, the effect of preventing wavy wrinkles is large, but the transfer of the toner image formed on the photosensitive drum to paper becomes poor. , a clear second original image cannot be obtained. Further, the thermal energy of the heat roll is used as energy for water evaporation, and the thermal energy for toner fusing is reduced, resulting in poor toner fusing to the transparent paper. moreover,
The transparent paper becomes stiff, making it difficult to pass through electrophotographic copying machines. The transparent paper for the second original drawing of the present invention is Canadian Standard Freeness (C, S, F, ) 100cc.
In the following process of manufacturing highly beaten cellulose fibers using a known paper machine, there is a method of controlling drying in a dryer to achieve a moisture content of 8.0 to 12.0%, and a method of producing highly beaten cellulose fibers using a paper machine in the same way as for high-quality paper. There is a method in which the moisture content is adjusted to 4.0 to 6.0% and then adjusted to 8.0 to 12.0% using a humidifier, but good results can be obtained with either method. Regarding the beating degree of cellulose fibers, as is well known, when cellulose fibers are beaten to a high degree to make paper, the voids in the paper layer are reduced, and paper with high transparency can be obtained. Since the transparent paper of the present invention is used as a second original paper, it must have high transparency, and the toner image on the transparent paper must be easily erased with a commercially available toner erasing liquid. It is important to beat cellulose fibers to a high degree to ensure their properties, and the Canadian Standard
It is necessary to beat the freeness (C1S, F,) to 100 cc or less, preferably 50 cc or less. The basis weight of the transparent paper for the second original drawing of the present invention is 50 to 100 g/
m, preferably 60 to 90 g/durability. If the basis weight is less than 50 g/m, the transparent paper will be weak and will have poor paper passing properties in an electrophotographic copying machine, resulting in problems in workability. Furthermore, when making a diazo copy using a diazo copying machine as a second original, there are problems in workability, such as weak stiffness and easy tearing. If the basis weight exceeds 100 g/I, the heat capacity for heating the paper becomes large, resulting in insufficient thermal energy from the heat roll, resulting in poor toner fixation. Further, since the paper becomes hard, problems arise such as making it difficult to handle as a second original paper. The transparency of the second original transparent paper of the present invention is 50% or more, preferably 60% or more. If the transparency is less than 50%, the second
There are problems such as the speed of diazo copying using a diazo copying machine as an original image is slow, and the image is difficult to produce clearly. Furthermore, problems arise in important characteristic items such as the ability to erase parts of toner and re-write on areas that need to be corrected, which are indispensable for the second original paper. The cellulose fibers used in the transparent paper of the present invention include bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), and bleached softwood sulfite pulp (NBSP).
, hardwood bleached sulfite pulp (LBSP), and cotton pulp.Although it is completed by mixing one or more types of cotton pulp, there is no particular restriction on the mixing ratio. There are two methods for producing transparent paper: acid papermaking in which aluminum sulfate is added and neutral papermaking in which aluminum sulfate is not added. can be achieved.

[Effect]

By adjusting the moisture content of the transparent paper of the present invention to 8.0 to 12.0%, a mechanism for preventing wavy wrinkles when the transparent paper is passed through an electrophotographic copying machine using a heat roll to fix the toner in a rolled form. Although not all of the details have been elucidated, after toner is transferred to transparent paper, when passing it through a heat roller to melt and fix the toner, it is possible to increase the number of wrinkles that would normally occur due to excessive heat energy. It is thought that the occurrence of wavy wrinkles can be prevented by water absorbing energy.

【Example】

The second original transparent paper of the present invention will be explained with reference to Examples. Examples 1 to 3 Softwood bleached kraft pulp (NBKP) was C and S. F. Using a pulp slurry that had been beaten to 80 cc and added with 0.2% alkyl ketene dimer, which is a neutral sizing agent, it was made using a Fourdrinier paper machine to produce a paper with a basis weight of 75 g/rd and a moisture content of 8.
．． Transparent paper was manufactured by adjusting drying to give 5%, 10.0%, and 11.5%. These transparent papers are rolled up to a width of 594 mm and a length of 150 m to produce an electrophotographic copying machine that uses a heat roll to fix the toner. ■Copy FW-7120D model manufactured by Ricoh and Canon NP-At model manufactured by Canon. When a second original drawing was created, a good second original drawing with no wavy wrinkles was obtained. Furthermore, when the obtained second original drawing was used as a manuscript and diazo copied using a diazo copying machine, a clear copy without skipped characters or blurred characters was obtained. The results are shown in Table 1. Comparative Examples 1 to 2 Using the pulp slurry of Example 1, a fourdrinier paper machine was used to produce a paper with a basis weight of 75 g/rri, a moisture content of 6.0%, and 6.5%.
Transparent paper was manufactured by adjusting the drying so that the drying temperature was %. When a second original image was prepared from these transparent papers in the same manner as in Example 1, wavy wrinkles were generated on the entire surface of the paper in the direction of the inside of the paper, along the grain of the paper (paper passing direction). Furthermore, when diazo copying was performed in the same manner as in Example 1, skipped characters and blurred characters occurred. Comparative Example 3 Using the pulp slurry of Example 1, a transparent paper was manufactured by drying the pulp slurry using a fourdrinier paper machine so that the paper had a basis weight of 75 g/rd and a moisture content of 12.5%. When a second original image was prepared from this transparent paper in the same manner as in Example 1, there were no wavy wrinkles, but there was little toner coverage, the image quality was poor, and line skipping was observed. Example 4 80 parts of softwood bleached kraft pulp (NBKP) and 20 parts of softwood bleached sulfite pulp (NBSP) were mixed into C1S, F, 50c.
Using pulp slurry beaten to C, the basis weight is 95g/
In the process of manufacturing transparent paper so that the moisture content is 9.5 m, a commercially available surface sizing agent (styrene-maleic anhydride copolymer) is applied in the size press section of a fourdrinier paper machine, and the water content is 9.5 m.
A transparent paper was produced by adjusting drying so that This transparent paper was wound into a roll with a width of 594 mm and a length of 150 m, and a second original drawing was created using a Recopy FW-7120 model and a Canon NP-Al model copying machine in the same manner as in Example 1. A good second original image with good flatness was obtained. Diazo copying was performed using this second original drawing using a diazo copying machine, and a clear copy was obtained. Comparative Example 4 Basis weight 95g/rI using the same method as Example 2! , moisture 6.
A transparent paper was manufactured to have a concentration of 1%. When a second original image was prepared from this transparent paper in the same manner as in Example 2, wavy wrinkles were generated all over the paper in the direction along the grain of the paper. When this second original drawing was used for diazo copying using a diazo copying machine, skipped characters, blurred characters, and partial omissions occurred, making the second original drawing impractical. Example 5 60 parts of softwood bleached kraft pulp (NBKP), 30 parts of softwood bleached sulfite pulp (NBSP), and 10 parts of hardwood bleached kraft pulp (LBKP) were mixed, and the freeness was C, S, F,
Using pulp slurry that had been beaten to 100cc and added with 0.2% rosin size and 1.5% sulfuric acid band,
Basis weight 60g/rr by fourdrinier paper machine? , moisture content is 5.8
A transparent paper was produced by adjusting drying so that The moisture content of this transparent paper was adjusted to 9.0% using a humidifier. This transparent paper was wound into a roll with a width of 594 mm and a length of 150 m, and the same process as in Example 1 was carried out using the Recopy FW-7120.
When a second original image was created using a D-type and Canon NP-Al type copying machine, a good second original image was obtained without wavy wrinkles. Furthermore, when diazo copying was performed using a diazo copying machine, clear copies were obtained without skipping or blurring of characters. Comparative Example 5 Basis weight 60 g/ffl obtained in Example 5, moisture content 5°8
When a second original drawing was prepared in the same manner as in Example 5 using transparent paper of 1.5%, wavy wrinkles were generated in a part of the paper along the grain (paper feeding direction). Furthermore, when I made a diazo copy using a diazo copying machine,
Text blurring was observed in areas where wavy wrinkles had occurred.

【Effect of the invention】

As is clear from the examples, the transparent paper for the second original drawing of the present invention, which is manufactured by highly beating cellulose fibers and has a paper moisture content of 8.0 to 12.0%, is By using an electrophotographic copying machine using a fixed toner fixation method, even if a second original is created in a rolled form, a good second original without any waving or wrinkles can be obtained.

Claims (1)

[Claims] Canadian Standard Freeness (C.S.
F. ) Transparent paper manufactured using cellulose fibers beaten to 100 cc or less, with a basis weight of 50 to 100 g/m
^2, transparency is 50% or more, moisture in paper is 8.0 to 1
2.0% transparent paper for second original drawings.