JP3737878B2 - Moisture-proof package containing a large number of accumulated small judgment paper made of electrophotographic transfer paper - Google Patents

Description

【００５１】
【発明の効果】
本発明による電子写真用転写紙及びそれを収納した防湿包装体を用いることにより、内包装紙を廃止することができ、開封時の負担や廃棄物の削減に繋がったのみならず、高速ＰＰＣや高速プリンターの走行試験に於いても支障のない結果が得られ、包装の簡素化と性能の維持を両立することができた。
【００５２】
特に大手ユーザーが一度に大量に電子写真用転写紙を使用する高速プリンター及び高速ＰＰＣの場合により効果を発揮するものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to transfer paper used in electrophotographic printers and PPCs (plain paper copiers), and in particular, simplifies packaging and contributes to reducing labor during mass use and volume reduction of used packaging materials. The present invention relates to an electrophotographic transfer paper, a moisture-proof package containing the same, or a packaging method using them.
[0002]
[Prior art]
Electrophotographic transfer paper (PPC paper) used for electrophotographic printers and PPCs is usually supplied in cut sheets such as A4 and B4, and can be handled almost the same as ordinary high-quality paper (writing, stamping, etc.) For this reason, the amount of use has increased with the progress of OA. Taking advantage of such convenience, the movement to perform document / form printing with high-speed electrophotographic printers and high-speed copiers using PPC paper is accelerating. However, it has been opened in various locations, and the replacement of conventional continuous slip forms is progressing. Therefore, the number of heavy users whose monthly paper usage per user reaches several tens of t is increasing.
[0003]
PPC paper, except for special ones, is generally cut into standard sizes such as A4, B4, etc. (subjudgment), and is usually about 100 to 1000 sheets in a moisture-proof packaging paper or synthetic resin bag such as polyethylene. In addition, about 3 to 10 books are collected and stored in a package such as a cardboard case, and supplied to the end customer. Therefore, a large amount of used cases and wrapping papers are generated every day for the heavy users as described above, and the burden of labor associated with the treatment and opening of the package is large, which is a problem. In addition, these packaging materials may be reused for sending out documents, etc., but they are usually treated as waste paper or waste after use. From the aspect, simplification of packaging materials has been desired.
[0004]
However, the role of packaging in PPC paper is not only to protect the contents, but also to keep moisture from entering and exiting the outside world in order to maintain good transfer image quality and runnability. The above-mentioned wrapping paper is coated with a moisture-proofing agent such as polyethylene laminate treatment, moisture-proof SBR, or styrene acrylic copolymer. For this reason, if the inner packaging is simply removed, the moisture of the paper will rise and fall due to changes in the external humidity, and the electrical resistance of the paper will change due to moisture fluctuations, affecting the transfer image quality, and accompanying moisture absorption and desorption. There are concerns about the occurrence of ripples, copy wrinkles, etc. Therefore, in order to simplify the packaging material, it is necessary that such problems do not occur and the burden on the user can be reduced.
[0005]
On the other hand, from the viewpoint of protecting resources related to environmental problems, PPC paper packaging capable of recycling packaging materials has been proposed (Japanese Patent Laid-Open Nos. 6-306955 and 7-206188), and sales of products have been started. However, even if the packaging material can be treated as a waste paper, the use of a moisture-proof packaging paper is not changed, and the packaging material is not sufficiently simplified.
[0006]
For this reason, proposals have not been made for the supply of electrophotographic transfer paper that can reduce the burden of packaging materials and reduce the burden of the work, and that does not cause quality degradation due to them. Not.
[0007]
[Problems to be solved by the invention]
In order to cope with environmental problems in the electrophotographic transfer paper and the package containing it, after omitting the inner wrapping paper of the package to reduce the amount of packaging material used and storing the package for a long time, It is an object of the present invention to provide an electrophotographic transfer paper that does not deteriorate the quality of the electrophotographic transfer paper after the package is opened, and a moisture-proof package containing the electrophotographic transfer paper.
[0008]
[Means for Solving the Problems]
In the present invention, as a result of intensive studies on the above problems, the elongation in water in the CD direction of the paper is 3.0% or less, the moisture is 4.7 to 7.0%, and the maximum strength in a zero span tensile tester. The electrophotographic transfer paper is characterized in that the direction is within ± 4 degrees with respect to the papermaking axis direction, and further, a large number of accumulated small judgment paper made of the electrophotographic transfer paper has a moisture permeability of 150 g. It was led to form a present invention by accommodating the / m ^2/24 hours or less moisture-proof packaging.
[0009]
When the conventional electrophotographic transfer paper is directly stored in a moisture-proof package without the inner wrapping paper, the moisture proof performance is lowered, and thus the inner wrapping paper cannot be omitted. The electrophotographic transfer paper of the present invention, on the other hand, in order to improve moisture-proof performance, be omitted inner wrapper by moisture permeability is housed in moistureproof package below 150g / m ^2/24 hours moistureproof Excellent performance. As a result, after storing the moisture-proof packaging body of the present invention for a long period of time, even if the packaging body is opened and the electrophotographic transfer paper is used, undulations, copy wrinkles, etc. associated with moisture absorption and desorption do not occur. Thus, an electrophotographic transfer paper of good quality was obtained.
[0010]
The electrophotographic transfer paper provided in the present invention is more suitable for use in high-speed printers and high-speed PPCs, but there is no strict definition of “high-speed”, and the scope of application is also found in each office machine manufacturer. In the present invention, it generally refers to a model having a printing ability of 50 pages or more per minute in A4 horizontal. The electrophotographic transfer paper provided in the present invention can also be used in printers and PPCs not corresponding to “high speed”.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Pulp used in the present invention may be any known one, and is not particularly limited. Various pulps such as kraft pulp, mechanical pulp, non-wood pulp such as kenaf, bagasse, hemp, bamboo, and waste paper pulp are used. Is possible. However, it is desirable to manage the freeness after blending to 380 ml or more for pulps that tend to have poor dimensional stability, such as waste paper pulp.
[0012]
As the filler used in the present invention, various known fillers such as heavy calcium carbonate, light calcium carbonate, kaolin, talc, titanium dioxide, calcined clay, and white carbon can be used, and the blending amount may cause generation of paper dust. Therefore, a blending ratio of 1 to 12% per sheet weight is desirable.
[0013]
In addition, various treatments such as treatment with a conductive agent, imparting sizing properties, dyeing, and pigment coating can be performed in order to provide the necessary characteristics as an electrophotographic transfer paper.
[0014]
The electrophotographic transfer paper of the present invention can be made with a known paper machine, but a twin-wire paper machine (including a hybrid former) with high curl control ability such as front and back fiber orientation, filler distribution, and fine fiber amount distribution. Is more preferable.
[0015]
The electrophotographic transfer paper must have an underwater elongation of 3.0% or less in the CD (perpendicular to the machine direction) direction. The underwater elongation is related to the corrugation of the paper, and the paper with a large underwater elongation is likely to be corrugated, and causes problems such as defective printing and jamming in handling. The underwater elongation generally fluctuates in the width direction of the paper machine and increases toward the end, but exceeding 3.0% causes the above problems.
[0016]
Next, the moisture needs to be in the range of 4.7 to 7.0%, more preferably 5.6 to 6.5%. Most of the water content of current electrophotographic transfer paper is approximately 3.8 to 5.5%, but the electrophotographic transfer paper provided in the present invention requires a slightly higher moisture value. This is because it is necessary to set the paper moisture close to a general indoor humidity environment from the viewpoint of reducing undulation due to moisture absorption of the paper. As a result of analyzing the generation mechanism of wavy, it tends to occur when the difference between the relative humidity converted value of paper moisture and the relative humidity of outside air exceeds 20%, and air conditioning in large-scale centralized copy rooms and print centers is generally humidity In consideration of being 40 to 60% RH, control in this moisture value range is necessary. The conversion value of the paper moisture into the relative humidity varies depending on the characteristics of the pulp used and the blending amount of the filler, but the relative humidity conversion value in the moisture value of the present invention is approximately 28% to 50% at a temperature of 20 ° C. Can be suppressed and improved.
[0017]
It has been pointed out that the moisture value of electrophotographic transfer paper is not preferable from the viewpoint of image suitability and curling after copying (especially 5.5% or more) (Japanese Patent Laid-Open No. 63-309700). When only the moisture value is raised, the above-mentioned problems may occur. However, the inventors have studied that the image characteristics can be adjusted at a moisture content of 7.0% or less, and there is no practical problem. In addition to the curl control technique, by adding the underwater elongation specified in the present invention and the angle management with a zero span tensile tester, it is possible to obtain a sheet having no practical problem.
[0018]
It is necessary from the aspect of curl management that the maximum strength direction in the zero span tensile tester is within ± 4 degrees with respect to the papermaking axis direction. The curling of electrophotographic transfer paper is not only the curl of the paper alone, but also the small judgment, so when curling that is oblique to the vertical and horizontal axial directions of the paper occurs, the lifting of the four corners is exaggerated, the actual situation It will be a bigger curl. Such slanted curls are also slanted with respect to the axial direction of the transport rolls of copying machines and printers, which deteriorates transportability. Since such slanted curls coincide with the maximum strength angle using a zero span tensile tester, the slant curl can be managed small by managing this angle within ± 4 degrees with respect to the papermaking axis direction. In addition, it is possible to prevent deterioration in transportability, and more preferably ± 3 degrees.
[0019]
Examples of means for achieving within ± 4 degrees include characteristic investigation in the width direction of the original fabric, adjustment of paper machine operating conditions such as raw material jet speed and slicing conditions, and the like.
[0020]
The basis weight of the electrophotographic transfer paper is preferably 60 to 85 g / m ² . If it is less than 60 g / m ² , the paper becomes less elastic and the transportability of a high-speed printer or high-speed PPC decreases, and the curl of the paper tends to increase. If it exceeds 85 g / m ² , the amount of dehumidification will increase when the moisture content is high (especially 5.5% or more). Problems such as remaining are likely to occur.
[0021]
Next, the packaging material used in the present invention will be described.
[0022]
In the present invention, unlike conventional electrophotographic transfer paper, moisture-proof paper or inner wrapping using a film is not used, so it is necessary to provide moisture resistance to the package.
[0023]
The case material used for the package is not particularly limited as long as the desired moisture resistance can be obtained. Known moisture-proof corrugated cardboard, cardboard, synthetic paper case, plastic case, synthetic resin pack (polyethylene, polypropylene, etc.) Bag-shaped packaging material) can be used. However, moisture-proof corrugated cardboard by a recyclable processing method is desirable from the viewpoint of resource protection, and a paper product case is desirable from the viewpoint of convenience of post-processing. The moisture-proof moisture-proof packaging is required from the viewpoint of preventing moisture excessive adsorption of the sheet is less than 150g / m ^2/24 hours, and preferably not more than 60g / m ^2/24 hours. If it exceeds 150g / m ^2/24 hours can not hygroscopic held, undulation or copy wrinkling. Also, if you are managing in a suitable low temperature (10 to 30 ° C.) and humidity (25-55%) made, moisture permeability, 60 g / m ² / problems due to moisture absorption even higher than 24 hours occur Absent.
[0024]
In addition, since the electrophotographic transfer paper itself can maintain strength, the moisture-proof package itself does not necessarily need to be a robust material unless particularly required.
[0025]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. The evaluation method in the present invention is as follows.
[0026]
(1) Basis weight: Measured according to JIS P8124.
[0027]
(2) Thickness: Measured according to JIS P8118.
[0028]
(3) Underwater elongation: JAPAN TAPPI NO. It measured according to 27A.
[0029]
(4) Moisture: Measured according to JIS P8127.
[0030]
(5) Moisture permeability: JAPAN TAPPI NO. It measured according to 7A.
[0031]
(6) Zero span tensile strength: Measured according to TAPPI T231.
[0032]
[Example 1]
A blend of 50% bleached kraft pulp and 30% fine recycled paper pulp and 20% magazine waste paper pulp, mixed with 7% light calcium carbonate as a filler in a pulp material adjusted to a freeness of 402 ml. Paper was made with a mer type paper machine. The physical properties of this electrophotographic transfer paper are as follows: basis weight 65.2 g / m ² , thickness 97 μm, elongation in water 2.5% in CD direction, moisture 5.2%, maximum strength direction in zero span tensile tester. The angle to the papermaking axis direction was 2 °.
[0033]
Toru (by JISZ1507) Humidity 55g / m ^2/24 hours 0203 format using duplex cardboard molding the case, 3,000 sheets filling the above electrophotographic transfer paper was cut into A4 size therein, the openings Sealed with commercially available renewable kraft tape.
[0034]
[Example 2]
Blended with 30% bleached kraft pulp and 60% fine recycled old paper pulp and 10% kenaf pulp, and mixed with a raw material of 7% light calcium carbonate as a filler in a pulp material adjusted to a freeness of 380 ml. Paper was made with a paper machine. This electrophotographic transfer paper has a basis weight of 75.0 g / m ² , a thickness of 105 μm, an elongation in water of 2.1% in the CD direction, a moisture content of 6.4%, and the axial direction of the paper making in the maximum strength direction with a zero span tensile tester. The angle to 3.3 ° was 3.3 °.
[0035]
Using the same double-sided cardboard as in Example 1, a 0303 type case was formed, and the above-described electrophotographic transfer paper was cut into 3000 sheets of A4 size, and the product was covered with a lid.
[0036]
[Example 3]
An electrophotographic transfer paper was obtained in the same manner as in Example 1 except that 10% of kaolin as a filler was added to 100% of bleached kraft pulp adjusted to a freeness of 425 ml. The physical properties of this electrophotographic transfer paper are as follows: basis weight 66.7 g / m ² , thickness 95 μm, elongation in water 2.7% in CD direction, moisture 5.9%, maximum strength direction in zero span tensile tester The angle to the papermaking axis direction was 1 °.
[0037]
A double-sided cardboard case similar to that in Example 1 was filled with 3000 sheets of the above-mentioned electrophotographic transfer paper cut to A4 size, and a lid was put on to make a product.
[0038]
[Comparative Example 1]
Except for using a double-sided corrugated cardboard moisture permeability 190g / m ^2/24 hours, the electrophotographic transfer paper in the same manner as in Example 1 were packed in moisture proof processing case.
[0039]
[Comparative Example 2]
A blend of 50% newspaper waste pulp, 20% thermomechanical pulp, 30% fine waste pulp, and adjusted to a freeness of 350 ml with a blend of light calcium carbonate and 7% per pulp as filler. Paper was made with a Ford Liner type paper machine. The physical properties of this electrophotographic transfer paper are as follows: basis weight 65.2 g / m ² , thickness 97 μm, elongation in water 3.5% in CD direction, moisture 5.4%, maximum strength direction in zero span tensile tester. The angle to the papermaking axis direction was 2 °.
[0040]
The same case as in Example 2 was filled with 3000 sheets of the above-mentioned electrophotographic transfer paper cut to A4 size, and the product was covered.
[0041]
[Comparative Example 3]
An electrophotographic transfer paper and a cardboard case storing it were obtained in the same manner as in Example 1 except that the drying conditions were changed to make the paper moisture 7.8% when the electrophotographic transfer paper was made.
[0042]
[Comparative Example 4]
Paper made of 100% bleached kraft pulp and adjusted to a freeness of 400 ml and blended with 3% kaolin as a filler was made with a Ford linear type paper machine. The physical properties of this electrophotographic transfer paper were as follows: basis weight 66.7 g / m ² , thickness 92 μm, elongation in water 2.7% in CD direction, moisture 6.1%, maximum strength direction in zero span tensile tester. The angle to the paper making axis direction was 5.5 °.
[0043]
3000 sheets of this electrophotographic transfer paper cut to A4 size were packed in a cardboard case similar to Example 1 and sealed.
[0044]
[Comparative Example 5]
Basis weight 66.0 g / m ² , thickness 93 μm, elongation in water 3.1% in the CD direction, moisture 4.4%, angle of the maximum strength direction in the zero-span tensile testing machine 4.3 ° A commercially available electrophotographic transfer paper ("PPC paper A4" manufactured by Nippon Paper Industries Co., Ltd.) was stored in the same case as in Example 1.
[0045]
Each of the above samples was stored separately in a room at 20 ± 3 degrees Celsius and relative humidity 65 ± 15% and stored at the same time, and subjected to various evaluations using the electrophotographic transfer paper after 60 days.
[0046]
(1) Suitability for high-speed printers Each sample was printed on a single side 1500 and double-sided 1500 using an electrophotographic high speed printer FX-4660 (trade name of Fuji Xerox Co., Ltd.). At this time, the problems (jams, paper feed failures, post-printing integration failures, image failures, etc.) that occurred were evaluated.
[0047]
{Circle around (2)} High-Speed PPC Suitability A high-speed PPC of an electrophotographic system, NP-9800 (trade name of Canon Inc.), made a copy of 1500 sheets on one side and 750 sheets on both sides with A4 through. The failure was evaluated in the same manner as (1).
[0048]
The above evaluation was performed in a room at a temperature of 20 ° C. and a relative humidity of 45%.
[0049]
The evaluation results are summarized in Table 1.
[0050]
[Table 1]

[0051]
【The invention's effect】
By using the electrophotographic transfer paper according to the present invention and the moisture-proof packaging body that houses the transfer paper, the inner wrapping paper can be abolished, which not only has led to a reduction in burden and waste during opening, but also high-speed PPC In the running test of the high-speed printer, no problem was obtained, and both simplification of packaging and maintenance of performance were achieved.
[0052]
This is particularly effective in the case of a high-speed printer and high-speed PPC in which a large user uses a large amount of electrophotographic transfer paper at a time.

Claims (4)

It is characterized in that the elongation in water in the paper CD direction is 3.0% or less, the water content is 4.7 to 7.0%, and the maximum strength direction in the zero span tensile tester is within ± 4 degrees with respect to the papermaking axis direction. the number of the deposited oval cut paper consisting of electrophotographic transfer paper to be accommodated the moistureproof package, the moisture permeability of the moistureproof packaging is not more than 150g / m ^2/24 hours, the oval cut paper The said moisture-proof packaging body which does not use the inner packaging paper to carry out an inner packaging . Moistureproof package according to claim 1, the basis weight of the transfer paper for electrophotography is characterized in that it is a 60~85g / m ^2. The moistureproof packaging is cardboard case according to claim 1 or 2 moistureproof package according. The moisture permeability of the moisture-proof package is 60. g / m ² The moisture-proof package according to any one of claims 1 to 3, which is / 24 hours or less.