JPH05177924A - Continuous recording paper - Google Patents

Abstract

(57) [Summary] [Purpose] After heating and printing, the inclined and tilted phenomenon of continuously folded and laminated paper is small at all positions in the width direction of the paper machine.
(EN) Provided is continuous recording paper with less trouble such as paper jam in a stacker (paper ejection unit) of a printing device. [Structure] Paper orientation angle θ (S) and back surface orientation angle θ
The sum of (W) is within 12 degrees, and the absolute value of the difference between the front and back sides of the orientation angle of the paper is within 8 degrees. Preferably, the difference between the maximum value and the minimum value of the aspect ratio of the paper is 0. A method for producing continuous recording paper, which comprises adjusting the amount to be 05 or less, and more preferably performing papermaking using a twin wire former. [Effect] It is possible to provide a continuous recording sheet with less inclination after heating and printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous recording paper, and more specifically, in a non-impact printer, a stacking paper of a printing device (printer stacker) which is not inclined by continuous folding and stacking after printing. The present invention relates to continuous recording paper in which there are few troubles such as paper jams in the paper discharge section).

[0002]

2. Description of the Related Art In recent years, output computers have been required to have high speed, versatility, and low noise as the size of computers has increased and the amount of information processing has increased. The number of non-impact printers is increasing rapidly.

In this type of printing apparatus, the printed toner is fixed by pressing the paper against a drum heated to about 200 degrees, so that the water content of the paper is reduced and the paper shrinks.
At this time, if the amounts of deformation in the two diagonal directions of the papers are different, the papers that are continuously folded after printing are stacked in an inclined shape, which causes a trouble in the stacker.

It is known that these inclination phenomena involve a deviation between the principal axis of fiber orientation in paper and the papermaking direction. In this regard, Japanese Patent Application Laid-Open No. 59-31186 discloses a machine operating condition such as a paper making speed, a speed ratio (jet ratio) of a slurry jet and a net making, a strengthening of shaking, a position of a forming board, a use condition of a dandy roll and the like. A continuous recording paper of a printing heat fixing system characterized in that the angle formed by the principal axis of the fiber orientation in the paper measured by the sonic method and the papermaking direction is adjusted to ± 5.5 degrees or less. There is.

[0005]

However, when papermaking is carried out by a high-speed paper machine, the shearing rate of the fiber slurry is remarkably increased and the speed gradient in the slurry layer is increased. Is difficult to prevent. That is, an object of the present invention is to provide a continuous recording paper in which even after being printed with a high-speed paper machine, the inclination phenomenon of the continuously folded and laminated paper after heating and printing is small at all positions in the width direction of the paper machine. ..

[0006]

In order to achieve the above-mentioned object, the present inventor has found that in order to achieve the above object, the ratio of the ultrasonic wave propagation speed in the papermaking direction and the direction orthogonal to it in the orientation angles of the front and back layers of the paper and over the entire width of the paper machine. As a result of studying the relationship between the profile of the aspect ratio of the paper (MD / CD) and the inclination phenomenon, the absolute value of the sum of the orientation angles of the front and back layers measured by peeling the paper into two layers having the same basis weight is 12 degrees. And the absolute value of the difference between the front and back orientation angles is 8
The degree of difference is less than 0.05, and more preferably, the difference between the maximum and minimum values of the aspect ratio measured for the entire width of the paper machine is adjusted to be 0.05 or less, and more preferably, papermaking is performed with a twin wire former. As a result, it was found that after thermal printing, a continuous recording paper in which the folding and laminating papers with continuous folding have very little inclination phenomenon was obtained, and the present invention was completed.

The difference between the front and back of the orientation angle in the present invention means the surface (S) separated by a sheet splitter or the like so as to have the same basis weight.
ASTM for each sample of each layer) and back (W layer)
The orientation angle θ (S) and θ (W) are measured by using a device specified by F89-68, a sonic sheet tester described in Pulp and Paper Technology Association magazine, July 1986, p. 40, etc. The absolute value of the value obtained by subtracting θ (W) from (S) is defined as the front-back difference of the orientation angle of the paper.

Conventionally, the orientation angle of paper has been discussed by measuring only the orientation angle of the entire paper and, after heating and printing, the relationship with the inclination phenomenon of sheets that are continuously folded and laminated. However,
At first glance, even if it seems that the orientation angles of the entire paper are uniform, if the distribution of the fibers in the sheet, especially on the front and back, is different, drying stress is ubiquitous in the paper from the press part to the dry part. Are accumulated as a result and lead to a tilt phenomenon during heating printing.

Therefore, it is necessary to carry out the papermaking under the condition that the difference in the orientation angle between the front and back surfaces of the fiber is made as small as possible. Specifically, when (1) papermaking is performed using a gap former, or when using a hybrid former, (2) the landing points of the slurry jets from the slice lips are made uniform in the width direction. Adjust the position of the forming board so that (3) adjust the position and number of foils in the wire part so that the dehydration in the first half of the wire part is accelerated in order to speed up the setting of the fibers in the slurry, ( 4) Raise the temperature of papermaking during papermaking, (5) Reduce the deviation of the slice lip opening at each position in the width direction, (6) Use the deckle shower at the ear of the headbox, and drive side It is possible to use a method such as adjusting the balance of the flow rate on the operating side, alone or in combination.

Further, when the continuous recording paper is made into a paper, if the difference in the ratio of ultrasonic wave propagation speed in the width direction is large, when the perforation is made, the tension of the paper differs in the width direction in the processing machine. , It becomes impossible to make a perforation perpendicular to the paper flow direction. Furthermore, when a continuous recording paper whose elastic modulus changes greatly in the plane of the paper in this way, the difference in the plane of shrinkage of the paper that occurs at the time of heating printing becomes large, and the Cause a tilt phenomenon.

Therefore, even better results can be obtained by simultaneously performing the papermaking under the condition that the ratio of the ultrasonic wave propagation speed changes little over the entire width of the paper machine. Specifically, (1) increase the water squeezing rate in the press section as a whole, and adjust the water profile in the width direction by crown control,
(2) Suppress the draw of wet paper from the press section to the entrance of the dryer, (3) make the temperature gradient of the initial drying zone (group 1) dryer steep, (4) increase the tension of the dryer canvas, etc. It is possible to provide a continuous recording paper having the characteristics of the present invention by using it alone or in combination.

The continuous recording paper of the present invention includes LBKP, N
BKP, DIP, GP, TMP, etc. are used as pulp raw materials and are made by various formers, and a twin wire former such as a gap former is preferable. Also, fillers, dyes, sizing agents, dry paper strength enhancers,
Additives that are usually used in papermaking, such as a wet paper strength enhancer, a fixing agent, and a yield improving agent, are included as necessary. Surface treatment with starch, polyvinyl alcohol, polyacrylamide, gelatin or the like can be performed as necessary.

The continuous recording paper of the present invention can be used as a paper of a heat fixing type non-impact type printing apparatus, a paper of a printing apparatus of a measuring recorder, and the like. It can also be used as electrophotographic copying paper. Further, it can be used for printing of offset, light offset, gravure, flexo, and the like.

The evaluation of the difference between the front and back of the orientation angle of the continuous recording paper of the present invention is such that the air layer of Nichiban cellophane tape does not enter the two measurement samples taken from the same sampling position in the width direction of the paper machine. So that it sticks evenly to the front of the paper for one sample and the back for the other,
These cellophane tapes were peeled from the respective measurement samples at a speed of 20 to 50 mm / min while the cellophane tape surface and the cellophane tape maintained an angle of 180 degrees. After peeling the cellophane tape, the back side paper layer (back side layer) or front side paper layer (front side layer) of the measurement sample before peeling can be obtained. About this back side layer measurement sample and front side layer measurement sample Nomura Using an ultrasonic orientation angle tester SST-200 manufactured by Shoji, the average value of the orientation angle in the machine direction and the orientation angle in the cross machine direction of the paper was measured. In the present invention, the absolute value of the difference between the orientation angle θ (S) measured for the front surface layer and the orientation angle θ (W) measured for the back surface layer is defined as the front / back difference of the orientation angle of the paper.

The inclination phenomenon of the continuous recording paper of the present invention was evaluated by a foaming machine with a paper width of 380 mm and a folding length of 2.
30 from perforated paper with a length of 80 mm
A sample with a height of mm is sampled at a speed of 10 m / min.
The sample obtained by continuously passing through a hot air dryer having a length of 1500 mm and folding again was shown in FIG.
This was done by measuring T). In order to prevent troubles in the stacker, the inclination coefficient needs to be at least 0.6 or less, preferably 0.3 or less.

[0016]

[Function] The orientation angle θ of the paper surface over the entire width of the paper machine
The absolute value of the sum of (S) and the orientation angle θ (W) of the back surface of the paper is 1
It is 2 ° or less and the difference between the front and back of the orientation angle of the paper is 8 ° or less, and more preferably the ratio of the ultrasonic wave propagation speed (MD /
The difference between the maximum value and the minimum value of the aspect ratio of the paper that can be represented by (CD) is 0.
By adjusting the value within the range of 05, continuous recording paper can be obtained in which the inclination phenomenon of the continuously folded and laminated paper after printing by heating is small over all positions in the width direction.

Here, the absolute value of the sum of the orientation angle θ (S) of the front surface of the paper and the orientation angle θ (W) of the back surface of the paper is 12 ° or less, and the difference between the front and back sides of the orientation angle of the paper is 8. Satisfies being less than °, or ultrasonic wave propagation velocity ratio (MD / CD)
The difference between the maximum and minimum aspect ratios of paper represented by is 0.0
It is considered that setting the ratio to 5 or less contributes to reducing the difference in the shrinkage ratio of the paper in the plane that occurs during heating printing.

[0018]

EXAMPLES The present invention will be described in detail below with reference to examples. The present invention is not limited to the embodiments. All parts and percentages below are by weight.

Example 1 100 parts of a 7: 3 mixture by weight of LBKP and NBKP beaten to a freeness of 350 ml had a content of 7% in paper.
Using a slurry containing 0.1 parts of precipitated calcium carbonate, 0.1 parts of alkyl ketene dimer sizing agent, and 0.7 parts of cationic starch, a hybrid former with a papermaking width of 4800 mm and a papermaking speed of 700 m / min gives a basis weight of 64 g / m ² continuous recording paper was produced. At that time, the J / W ratio was set to 0.98, which was slightly larger, the flow rate balance of the deckle shower at the ear of the head box was set to 1: 1 on the operating side and the driving side, and the liquid temperature of the slurry was set to 30 ° C. Papermaking was carried out by setting the crown in the section to 40% and setting the draw from the press section to the dryer section to 1.03 m / min. The results of this sample are shown in Table 1.

Example 2 Except that the flow rate balance of the deckle shower at the ear of the headbox was set to 1: 1 on the operating side and the driving side, the liquid temperature of the slurry was set to 40 degrees, and the crown of the pressing section was set to 55%. A continuous recording paper was manufactured under the same conditions as in Example 1.
The results of this sample are shown in Table 2.

Example 3 Continuous recording paper having a basis weight of 64 g / m ² was produced by a gap former having a papermaking width of 4800 mm and a papermaking speed of 700 m / min while balancing the differential pressure between the operating side and the driving side of the headbox. At that time, except that the J / W ratio was set to 0.98,
Continuous recording paper was manufactured under the same conditions as in Example 1. The results of this sample are shown in Table 3.

Example 4 Continuous recording paper having a basis weight of 64 g / m ² was produced by a Fourdrinier paper machine having a papermaking width of 4800 mm and a papermaking speed of 500 m / min. J /
The W ratio was 0.98, the flow rate balance of the deckle shower at the ear of the head box was 1: 1 on the operating side and the driving side, the liquid temperature of the slurry was 40 degrees, and the crown at the press section was set to 55%. A continuous recording paper was manufactured under the same conditions as in Example 1 except for the above. The results of this sample are shown in Table 4.

Comparative Example 1 Continuous recording paper was manufactured under the same conditions as in Example 1 except that the balance of the flow rate of the deckle shower at the ear of the headbox was 1.75: 1 on the operating side and the driving side. did. The results of this sample are shown in Table 5.

Comparative Example 2 A continuous recording paper was produced under the same conditions as in Example 1 except that the flow rate of the deckle shower at the ear of the head box was adjusted to 2: 1 on the operating side and the driving side. The results of this sample are shown in Table 6.

Comparative Example 3 As in Example 1 except that the balance of the flow rate of the deckle shower at the ear of the head box was set to 1: 1 on the operating side and the driving side, and the crown at the pressing section was made to be 35% higher. Continuous recording paper was manufactured under the same conditions. The results of this sample are shown in Table 7.

Comparative Example 4 A continuous recording paper having a basis weight of 64 g / m ² was produced with a Fourdrinier paper machine having a papermaking width of 4800 mm and a papermaking speed of 500 m / min. J /
Example 1 except that the W ratio was 0.98, the flow rate balance of the deckle shower at the ear portion of the head box was 1: 1 on the operating side and the driving side, and the crown at the press portion was set to 35% to produce it. Continuous recording paper was manufactured under the same conditions as above.
The results of this sample are shown in Table 8.

Comparative Example 5 A continuous recording paper was produced under the same conditions as in Comparative Example 4 except that the J / W ratio was 1.10. The results of this sample are shown in Table 9.

[0028]

[Table 1] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0029]

[Table 2] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0030]

[Table 3] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0031]

[Table 4] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0032]

[Table 5] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0033]

[Table 6] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0034]

[Table 7] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0035]

[Table 8] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0036]

[Table 9] Regarding the position in the width direction, 1 indicates the operating side and 5 indicates the driving side. The sum of orientation angles is the orientation angle θ (S) on the front side of the paper and the orientation angle θ on the back side of the paper.
It is the sum of (W). Velocity ratio means ultrasonic wave propagation velocity ratio. L / T means a slope coefficient.

[0037]

The results of Table 1 show that the absolute value of the sum of the orientation angle θ (S) of the surface layer and the orientation angle θ (W) of the back surface is large when the difference between the orientation angle of the paper is 8 degrees or less. Nevertheless, it is shown that a paper with less tilt phenomenon can be obtained. Table 2 shows that by making the aspect ratio uniform in the width direction at the same time as the difference in the orientation angle of the paper, it is possible to obtain a paper having a very small inclination over the entire width of the paper machine. Furthermore, Table 3
Have shown that it is possible to fabricate continuous recording paper with a small difference in the orientation angle of the paper by using a twin wire former of a type with a fast initial dehydration. From the above results, the orientation angle θ of the paper surface across the width of the paper machine
The absolute value of the sum of (S) and the orientation angle θ (W) of the back surface of the paper is 12
And the absolute value of the difference between the front and back of the paper orientation angle is 8
Or less, and preferably the ratio of ultrasonic wave propagation speed (MD /
The difference between the maximum value and the minimum value of the aspect ratio of the paper that can be represented by (CD) is 0.
It is adjusted so as to be within 05, and more preferably, by performing papermaking using a twin wire former, after heating and printing, the inclination phenomenon of the continuously folded and laminated paper is small over all positions in the width direction, It is clear that continuous recording paper can be produced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a form of an inclination phenomenon of continuous recording paper.

Claims (3)

[Claims] 1. The absolute value of the sum of the orientation angle θ (S) of the front surface of the paper and the orientation angle θ (W) of the back surface of the paper is within 12 degrees, and
A continuous recording paper, characterized in that the absolute value of the difference in orientation angle between the front and back of the paper is within 8 degrees. 2. The difference between the maximum value and the minimum value of the aspect ratio of the paper which can be expressed by the ratio (MD / CD) of ultrasonic wave propagation speed over the entire width of the paper machine is within 0.05. Item 1
Continuous recording paper described. 3. The continuous recording paper according to claim 1, which is manufactured by using a twin wire former.