JPH0561399B2 - - Google Patents

Abstract

1. Format paper with 2 to 7 wt. % water, 10 to 20 wt. % ash and, as the remainder, paper fibrous materials with a woody fibre fraction of more than 10 wt. %, referred to the paper fibrous materials, a brightness within the range from 65 to 91, characterised by dust adhesion Mv at least one longitudinal edge corresponding to a luminous reflectance value by the adhesive tape method within the range from 2 to 6, and dust adhesion at least one transverse edge corresponding to a luminous reflectance value by the adhesive tape method below 1.5, in each case measured on a ream of paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing standard paper with less paper dust.

[Prior Art] Demand for standard paper with less paper dust is increasing significantly. It is especially important to use these for copying. In the production of copying paper, it is made exclusively from cellulose, and fillers and chemicals normally used in papermaking, such as sizing agents, are added during papermaking on a paper machine. However, even high-quality copy paper may be made from waste paper, in which case returned printed matter, old newspapers, household goods catalogs, etc. may be used as raw materials.

Copy paper is subject to high standards for quality that affects the finish of copies. In other words, paper suitable for copying has good smoothness and stiffness (stiffness), good water retention control, sufficient tensile strength and bulk stability, and in addition, toner adhesion. It is required to have properties that improve performance, readability, and resolution. Further criteria for copying paper are that it has high standard accuracy as a standard paper, is cut at right angles, has little paper dust, and has no unevenness in cutting.

With increasing awareness of the need for environmental protection and the scarcity of valuable raw materials, the paper industry has begun to place emphasis on so-called recycled paper production. These are old newspapers, returned printed materials,
Manufactured from pre-selected waste paper, such as household goods catalogs, etc., in which the quality of the paper, which does not contain lignified fibers, gradually approaches important properties through improvements in manufacturing technology. Efforts have been made to This is particularly important in the production of copy paper, which is produced essentially from waste paper.

OBJECTS OF THE INVENTION The present invention aims at creating a new standard version of paper based on recycled, i.e. at least partially waste paper, which exhibits particularly suitable properties for use in copying. In this case, these papers should in particular contain significantly less paper dust and should have no irregularities in cutting. The present invention thus provides a method for manufacturing standard paper with less paper dust.

[Configuration of the Invention] In order to achieve the above object, the present invention preferably uses DIN (Deutsche Industrie Norm, German Industrial Standard) A4 version standard (JIS-A4 version standard (210 mm x
(equivalent to 297 mm), the various processes of disintegration, deinking, and sorting are carried out, and the waste paper that has been sorted and prepared is used to undergo the dispersion and bleaching processes, and the paper produced by making it on a paper machine is processed in the cutting process. (a) Paper feeding to the vertical cutter, (b) Cutting with the vertical cutter, (c) Paper feeding to the horizontal cutter, (d) Cutting with the horizontal cutter, and (e) After cutting with the horizontal cutter The moisture content is 2 to 7% by weight, the ash content is 12 to 20% by weight, and the remaining paper fibers are lignified fibers. It accounts for at least 10% by weight of paper cellulose, has a whiteness of 65 to 91, and has at least one longitudinal side corresponding to the luminous reflectance value measured by the adhesive tape method for each paper ream (Papierries). The adhesion degree Mv of paper dust is 2 to 6, and the luminous reflectance value (Licht-
We have developed a method for manufacturing standard paper with less paper dust, in which the adhesion degree Mv of paper dust on at least one horizontal side is 1.5 or less, which corresponds to the paper dust (remissionswert).

The term "longitudinal edge" (Langskante) used within the scope of the present invention refers to the edge of the standard paper cut by the longitudinal blade, whereas the term "horizontal edge (Querkante)" , corresponds to the side cut with a horizontal blade. This means that when cutting narrow widths, the long side is the "vertical side" (the short side is the " horizontal side”). For wide cutting runs, use DIN
“Vertical (direction) sides” in A4 and A3 size standards
is the short side (the longer side is the “horizontal side”).

The proportion of lignified fibers in the paper cellulose is very high, and in fact, almost all of the fibers may be composed of lignified fibers. The lignified fibers within the scope of the present invention include ground wood pulp itself, or refined ground pulp, or TMP fibers (heat-treated mechanical pulp) or TMCP fibers.
or mixtures thereof. In an embodiment of the paper suitable for the method of the invention, lignified fibers account for 58-82% by weight of the fiber portion (of the paper);
Particularly preferably, the fiber portion accounts for 65 to 80% by weight, with the remaining fiber portion consisting of cellulose fibers.

The paper of the process according to the invention is particularly adjusted to have an ash content of preferably 14 to 17% by weight, based on the paper. Furthermore, the moisture content, or water content, of the paper of the present invention is extremely controlled, and is particularly preferably 4 to 5.5% by weight based on the total weight of the paper.

The most desirable embodiment of the paper with less paper dust according to the method of the present invention is one having (4 to 5.5) ±0.5% by weight of moisture, 14 to 17% by weight of ash, and paper cellulose as a balance. In this case, the proportion of lignified fibers is 65 to 80% by weight of the cellulose. Also in this case, it is desirable that the paper of the method of the invention exhibits a whiteness of 73-80.

The paper produced by the process of the invention is particularly advantageous in that it contains significantly less paper dust, and the degree of adhesion of paper dust on at least one longitudinal side is preferably between 2.5 and 6, preferably between 2.5 and 5.5. High-quality paper that is particularly suitable for copying purposes has an average degree of paper dust adhesion on at least one longitudinal edge.
Shows 2.5 to 5. In this case, within the scope of the present invention,
Particularly when copying these papers, it is particularly advantageous to ensure that both longitudinal sides have the above-mentioned desired paper dust adhesion standard for at least one side of the paper. Since the amount of paper dust is extremely small, the paper of the present invention exhibiting the above-mentioned range of paper dust adhesion on one vertical side, especially the desirable range shown, is suitable for copying purposes. This reduces the vertical side by about 10 to 40%, preferably
12-30%, the value of paper adhesion degree may be higher.

The paper used in the method of the present invention is 0.65 to 0.9 g/cm ³
It has a coarse density (according to DIN 53105) of 0.7 to 0.8.

The standardized paper according to the method of the present invention also has a low proportion of paper dust on the lateral sides, and the degree of adhesion of paper dust on at least one side is generally 1.5 or less, preferably 1.5 to 1, but also on the lateral sides. It is convenient for both sides to be in this range.

The values of the adhesion degree of paper dust on the vertical and horizontal sides shown here were measured for each paper ream by the adhesive tape method described later.

In addition, the paper dust on the surface of the standard paper produced by the method of the present invention shows a low value, and the dust value is lower than 3 on one surface, but it is at this value on both sides of the paper (that is, the front and back sides of the paper). This is desirable. This dust value is Lorentzen
& Wettres dust meter (code no. 56 of the Swedish manufacturer of this name). This method will be explained later.

As explained above, the paper of the method of the invention is produced at least in part using recycled paper. In this case, paper is at least 60%, preferably 70-100%
It is preferable that the paper is made from paper stock obtained from waste paper of If only a portion of the paper stock obtained from waste paper is to be used, an appropriate paper stock that is normally used in naturally produced paper is added.

The production of paper according to the invention can in principle be described in German Patents Nos. 3148749 and 3148750 (applicant:
Steinbeis Papier GmbH, Gemmrigheim), but also takes into account the addition of complex processing to obtain paper with even less paper dust, as shown in the present invention.

In a preferred embodiment of the method of the present invention, waste paper which has been sorted and prepared through the steps of defibration, deinking, and sorting, and has been subjected to decomposition and bleaching steps, is used, and the 60-100% Paper is made from paper stock using a paper machine, and if desired, the paper strip is cut by a vertical blade running at a speed of 100 to 400 m/min with a built-in dust removal device installed on a breaker strip (Brechleiste). Air is blown onto the paper to suck out the generated dust, and then the paper strip cut in the longitudinal direction is guided onto a suction table with slits, and the vertical edges of the paper strip are accurately aligned with the slits. The dust generated by this is removed again, then a horizontal blade is inserted, and the dust generated during further stacking of the reams is suctioned off or blown away and removed by suction. At this time, the reduced pressure required for dust removal is advantageous. can be produced by holding the water at 250-80 mbar, with a moisture content of 4-5% by weight and an ash content of 14-17% by weight, with lignified fibers as the remaining paper cellulose containing 65-65% of the cellulose. Accounts for 80% by weight, whiteness is 73~80
In addition, the adhesion degree of paper powder on at least one vertical side corresponding to the luminous reflectance value measured by the adhesive tape method for each paper ream is 2 to 5.5, and the luminous reflectance value also measured by the adhesive tape method. The adhesion degree of paper dust on at least one side corresponding to the ratio value is 1.1 or less
Standardized paper with less paper dust that preferably conforms to DIN A4 and DIN A3 standards can be obtained.

The method of the present invention for producing standardized paper with less paper dust is as follows:
As explained earlier, the waste paper that has been sorted and prepared through the various processes of defibration, deinking, and sorting, and the dispersion and bleaching processes is used, and then it is run through a paper machine to make paper, and then the cutting process is carried out. That is, it is devised to remove dust generated during paper feeding to the vertical cutter and horizontal cutter, and during cutting operations with the horizontal cutter.

In an advantageous embodiment of the method according to the invention, a dust removal step is added once again between the feed and sorting after cross-cutting.

A particular advantage within this process is also the filtration of the circulating size liquid.

Sizing composition also influences paper dust reduction. This is because it is desirable not only to adjust the resin size but also to add a cationic sizing agent along with ordinary auxiliary agents.

In the method of the present invention, air is blown onto the cutting edge of a paper strip guided over a breaker strip, optionally having a built-in dust suction device, to suction and remove the dust generated, and the paper strip is cut lengthwise. The paper strip is guided onto a suction stand with slits, the vertical cut edges of the paper strip are aligned with the slits, the dust generated by this is removed again, and then the dust generated by the horizontal blade is removed. Vacuum it out, or blow it out and vacuum it out again.

After cutting in the lateral direction, it is also effective to suction and remove the dust generated in the reams arranged in the lateral groove again, or to blow it away and remove it by suction.

For vertical or horizontal cutters, the upper and lower blades rotating opposite each other have at least one blade coated with hard metal or WIDIA alloy (tungsten-carbide alloy). This is desirable. In addition, in order to obtain the optimal cutting time ratio, the upper and lower blades are
Preferably, they are arranged without an angle to each other, and this is also within the scope of the present invention.

As previously indicated, the paper strip produced by the longitudinal cutting is guided onto a suction table with slits and dust is removed from the longitudinal edges under reduced pressure. This also provides a round ceiling above the slit perpendicular to the direction of conveyance of the paper strip, making it easier to "turn" the aligned reams and release dust from inside the paper strip as well. Further installation of effective brushes on the slits also improves dust removal. For example, rotating brushes can be placed side by side directly on the slit.

As explained above, in the embodiment of the present invention, dust may be removed by suction from the lower blade area of the vertical cutter portion, or dust may be removed by blowing air downward from the upper blade area. Good too.

The suction used for dust removal in the longitudinal lower blade part and/or in the lateral blade part and/or in the suction table part must maintain a pressure of 250 to 40 mbar at a cutting speed of the blade of 100 to 400 m/min. is advantageous. Best results are obtained within this range, but there is no harm in adjusting beyond this suction limit.

In the method for producing paper according to the present invention, pretreatment of waste paper, type of waste paper, preparation of a part or all of it into a paper stock used for paper making (preferably 60, or
70-100%) respectively, the above-mentioned West German patent no.
Gemmrigheim), so it would be appropriate to introduce the contents of that patent in its entirety here. Ultimately, in order to produce a suitable paper with criteria suitable for applications particularly requiring low paper dust, such as those described above, this known process must be modified or further processed. We have no choice but to apply it. These standards will be explained with reference to each equipment shown in the diagram below.
I would also like to clarify the particularly excellent points of the invention of the present application.

Next, a method for testing paper dust on cut edges ("adhesive tape method") is described. This is based on the principle of pasting a transparent adhesive tape on the side to be measured of a fixed ream of paper and then peeling it off again. A transparent adhesive tape with paper dust attached is attached to a black adhesive tape, and the whiteness of the black tape to which the transparent tape is attached is measured. In this case, the reference value is a black tape with a transparent tape that is not attached to the paper ream. The state of paper dust generation is estimated using the difference in whiteness obtained from the measured values. In the present invention, the paper powder values cited above were obtained by applying the following methods.

Use transparent adhesive tape of the following specifications.
19mm wide PVC film: tear strength 100N/25mm,
Stretch rate 50%, adhesive strength 7N/25mm. The adhesive is acrylic resin. The transparent adhesive tape used was transparent “Tesa-Firm” Nr.4206.
(Beirsdorf, Hamburg).

A black adhesive tape with a width of 30 mm is suitable. Such a film is black "Tesa Film" No. 104 (manufactured by Beiersdorf,
Hamburg) is excellent.

Additionally, the following are necessary and useful:

Carton paper 250g/ ^m2 .

A series of fixed installations having the preferred construction shown in FIG.

A load roller for adhesive tape that weighs approximately 6 kg, has a freely movable shaft, and is supported so as not to apply excessive force to the pressurized paper during loading. This roller has a rubber film with Shore A hardness of 40 degrees attached.

Finally, the so-called Hunterlab measuring instrument (D25D2M/L color and color difference measuring device, Firma
Hunter Associates Laboratory, Inc., 9525
Lee Highway, Fairfax, Virg., 22030, USA)
use. In this case, the measuring tube will be shortened to 15 x 49 mm (see Figure 3).

The whiteness of the paper is also measured in conjunction using a Hunter D25 D2M/L device. In this case, all measurements are performed based on the standard conditions of the LAB-system (measurement conditions 115V, 50-60Hz, 45° illumination, 0°
field of view). As standard, C2-3598 has L=94.55 and A=0.7, B=+0.4.

For details, follow the steps below. Cut the carton paper to about 35 x 50 cm, make the vertical sides parallel,
Apply black adhesive tape (Tesa Film Nr.104) at intervals of about 2 cm.

A series of sheets of paper are pressed against each other from the sides, and the pressed edges are fixed with fixing equipment (Figure 1). At this time, adjust the pressure of the manometer so that the gravity on the plane of the head of the ream is equivalent to 1 Kg/cm ² .

For the vertical side to be measured, use a rug cutter to cut open the wrapping paper that wraps the reams at a point approximately 10 mm from the vertical side. This prevents any chips from cutting the wrapping paper from reaching the plane to be measured.

Apply transparent adhesive tape (Tesa Film Nr.4206) to the entire vertical cut edge and press down 5 times with a loaded roller. In this case, the speed at which the rollers are moved should be approximately 1 second for the vertical side and slightly shorter for the horizontal side, according to the DINA 4 version standard, for one load operation, and in this case, The rollers should be loaded only by their own weight.

Approximately 5 to 10 seconds after finishing the load, remove the transparent adhesive tape with a force of 0.75 to 1.25N, preferably 1N, for approximately 2 seconds (in the case of DINA4 version), and remove the paper powder between the two adhesive tapes. Attach the entire length to black adhesive tape (Tesa Film Nr. 104) so that it can be sealed. Next, the tape is pressed down with a piece of cloth to prevent bubbles from forming.

Next, the whiteness is measured using the Hunterlab instrument using the shortened measuring tube (Figure 3). in this case,
It is customary to carry out three measurements per cutting edge.

Transparent tape with no paper dust attached (tesa)
The whiteness obtained from a black adhesive tape (tesa film Nr. 104) to which a film Nr. 4206) was adhered is given as the reference value for the Hunterlab measuring instrument. The difference from the reference value is the measured value of the degree of adhesion of paper dust.

The width of the measuring tube is taken into account depending on the paper thickness or surface weight of the various cut surfaces. In order to substantially eliminate this influence and obtain comparable values, the actual value M is converted to a unit coarse density of 1 g/cm ³ . That is, it is multiplied by the coarse density rate.

In order to eliminate the influence of reflection that differs due to various types of cellulose, the obtained measured value M is further calculated by the unit whiteness.
Convert at 90%. This provides a comparative measurement by which different papers can be compared in induced brightness, regardless of areal weight and density.

Mv = M・δ1/δ・L ₉₀ /L Mv = Comparative measurement value M = Actual measurement value δ1 = Rough density 1.0g/cm ³ δ = Rough density of paper to be measured L ₉₀ = Whiteness 90% L = Paper to be measured Using this method, based on comparative measurements regarding luminous reflectance values (Remissionswert), the whiteness of
Estimate the degree of paper dust adhesion on the vertical and horizontal sides.

The value of paper dust on the surface is determined by Firma AB Lorentzen.
A study was conducted using a code 56 dust meter manufactured by & Wettre (Sweden). The dust value was tested by pasting several whole sheets of paper on a roller with water, collecting the captured paper dust on a black filter paper, and comparing it optically. Code 56 dust meters are especially
Instructions issued by the manufacturer dated January 21, 1983
A3/78-4375 and is applied to measurements in the manner described therein.

Below, the present invention will be specifically explained with reference to the drawings, and the preferred embodiments of the present invention will be described individually.
and detailed in combination.

The stretching device shown in FIG. 1 for determining the amount of paper dust at the edge of a paper ream by the adhesive tape method has a base plate 10 and a hydraulic pump 12 is shown in the right half of FIG. There is. This pump equipment is operated by switching one electric switch 14, and switch buttons 16 are lined up above it. A base plate 10 having a pump equipment 12 and a changeover switch 14 in the upper right half of the drawing is partitioned by a partition plate 18 welded at right angles to the base plate 10. This partition plate 18
A hydraulic power machine 20 is installed on the back side of the pump equipment 12.
There is a hydraulic conduit 22 and a manometer 24.
is hydraulically connected to the pump equipment 12. The hydraulic power machine 20 is connected to a movable clamping plate 26 on the back side of the partition plate 18. At a distance from this movable clamping plate 26, there is a clamping plate 28 fixed on the back side of the partition plate 18, which is welded onto the base plate 10 in parallel with the movable clamping plate 26. . Two clamping plates 26 and 28
There is a space 30 between the opposite surfaces of the clamping plates, in which a ream of paper to be clamped between the two clamping plates can be easily inserted manually.

The ream of paper to be measured is inserted between two clamping plates prior to measurement. Movable clamping plate 2
6 uses a hydraulic power machine 20 and a manometer 24
until it shows the desired pressure that corresponds to the prescribed pressure.
Move toward the fixed clamping plate 28,
The paper ream is thereby pressed between the two plates from both sides.

FIG. 2 shows a load roller for pressing the adhesive tape against the surface of the edge of the paper ream to be tested for paper dust accumulation, which is surrounded by a rubber jacket 34.
It consists of a steel core 32 wrapped around. Since this loaded roller is intended to apply only a specific pressure to the adhesive tape corresponding to the roller's own gravity, a special arrangement is made in the connection between the roller and its handle 46. That is, a journal (neck) 38 of the shaft protrudes from the front side of the shaft of the steel core 32, which is connected to an elongated hole 40 drilled in the support shaft 42.
In this case, this support shaft 42 is provided with a connecting rod 44 and a suitable handle 46, and in this illustrative example, the connecting rod 44 is attached to the support shaft 44. The connection is made by welding in the center of the shaft 42 and at right angles thereto.

This structure of the load roller prevents the force exerted when moving the roller from acting against the load surface of the load roller, so that constant pressure is always applied to the adhesive band when moving the roller. make it work.

Figure 3 is a cross-sectional view of the screen (Blende) used in the so-called “Hunterlab” measuring instrument (3rd
Fig. 3a) and a plan view (Fig. 3b).
The basic component of this screen is a hollow ring 46 having a height H. The ring is conically tapered on both its inner and outer circumferences, with a large upper opening 48 and a smaller lower opening 50 on the inner circumference of the tube 46. This lower, smaller opening 50 has a rectangular shape with a width b and a length l, which (1) is larger than the diameter D of the upper opening 48.
The true opening of the screen is therefore formed by the lower opening 50.

Figures 4a and 4b each show a bar graph. The ordinate of the graph represents the whiteness difference, and the abscissa relates to the paper obtained by the method of the invention or the commercially available or type of paper. The small frame in the graph shows the range of whiteness difference for each paper quality, and in this case, the size of the reference value is the black surface of the reference plate, so it is actually 0. is given by the reflectance, that is, the minimum reflective whiteness. When an adhesive tape with paper dust collected from the edge of a ream of paper is attached to this black reference surface, the reflective whiteness changes greatly in proportion to the amount of paper dust, and if there is a large amount of paper dust, It gets even bigger. It is clear from the graph that the whiteness difference value of the paper obtained by the method of the present invention is lower than that of the compared known paper. It shows that there is essentially less dust accumulation on the edges or edges generated by the effects of cutting.

The commercially available paper is as follows: [Commercially available product] Remanufactured copying paper with the trade name Copy Loewe manufactured by Steyrermuehl, Austria.

[Commercial product] Bohnenberger, Germany
Company-made recycled copy paper.

[Commercial product] Transfer paper (contains wood pulp from natural fibers) manufactured by PWA, Germany, under the trade name mittelfein Umdruck.

All contain at least 10% lignified fiber.

Commercial products and use as copy paper are recommended.

Figure 5 shows how the web is processed in various ways.
1 schematically depicts a portion of the apparatus shown in a series of workstations; FIG. In particular, various types of paper dust suction devices are employed.

From left to right in Figure 5, station A
Then the web is guided to the guide edge. It is then sent to station B, where the web is passed through a rotating hole if desired. Next, at station C, the material is vertically cut. Lateral cutting of the paper web is performed at the following station D, and the paper is sent to a separation device E and a paper alignment station F, where the cut paper is sorted and stacked. At the final station G, the stacked stacks of paper are carried out.

The individual stations will be explained below with reference to FIGS. 6 to 10.

FIG. 6 shows the guide edge 52 at station A together with the paper powder suction device integrated therewith. As shown in FIG.
4 towards the guide edge 52, where the web is turned back by α at the corner 56 of the guide edge 52.

The suction groove is made of a hollow box 58, and a short tube 60 is attached to the side opposite to the guide edge 56. This short pipe 60 is connected to a hose 62.

The guide edge 56 is formed in a block 64 attached to the side of the hollow box 58 opposite the short tube 60. Guide edge 56 of block 64
A suction groove 66 communicating with a suction port 68 of the hollow box 58 is formed in front of the guide edge 56 in the feeding direction of the web P, close to the guide edge 56 . Two suction grooves 6
6 and 67 are arranged symmetrically, so that after the guide edge 56 wears out, it can be replaced with a symmetrical guide edge 57.
It is possible to change the posture of 4.

The entire guide edge 52 can be rotated about the central axis M of the roll 54 in accordance with the arrow 69 and adjusted to a constant deflection angle α.

When suction is applied through the hose 62, an air flow is generated in the direction of the arrow from near the guide edge 56, through the suction groove 66, the suction port 68, and the hollow box 58 to the short tube 60, so that the paper powder that has collected near the guide edge is removed. , and are removed along with the air flow.

FIG. 7 shows details of station C. The upper cutter 7 is installed inside the frame 70 of this station.
2 and the lower cutter 74 are rotatably supported. This cutter is a circular cutter and is installed parallel to the rotation axis direction. Here, the cutting blade 75 of the circular lower cutter 74 and the cutting blade 7 of the upper cutter 72
3 overlaps at the incision and vertical cutting point a. The axes of rotation of the circular cutters 72, 74 are adjusted to be perpendicular to the direction of movement of the web and parallel to each other. In the direction of movement of the web, a guide plate 76 is placed in front of the rotary cutter, and a guide table, which is a suction table 78, is placed behind the rotary cutter. The web is continuously fed over the guide plate 76 and the suction table 78, and is vertically cut by the cutter described above. Paper dust is generated during this vertical cutting and must be removed as completely as possible. This paper dust removal is carried out by three devices in the length cutting machine as a whole: a first suction device 80 located just below the lower cutter 74, a second suction device located above the suction table 78 and behind the upper cutter 72. 82 and a third suction device 84 which is located behind the second suction device 82 in the direction of movement of the web at the bottom of the suction table 78.

In the first suction device 80, suction ports 88 are arranged and opened in an L-shaped lower cutter beam 86 immediately below the lower cutter 74. On its underside, the lower cutter beam 86 opens into a vacuum box 90;
Furthermore, it is connected to a hose 94 via a short pipe 92.

The aforementioned guide plate 76 is attached to the vertical arm of the lower cutter beam 86 via a backing plate 96. A cover plate 98 is attached to the inside of the lower cutter beam 86 to prevent paper dust from accumulating. Lower cutter beam 86
An end cover 100 extending to the lower cutter 74 is attached to the free end of the horizontal arm of the lower cutter 74.
4. A vacuum chamber 102 is formed by the patch plate 96, the guide plate 76, and the suction table 78.

When air is sucked through the hose 94, the air in the cut portions of both cutters is sucked in, passes through the suction port 88 to the vacuum box 90, and then from there to the hose 94.
reach. This airflow entrains most of the paper dust generated near the cutter during vertical cutting.

The second suction device 82 comprises a blowing nozzle 104 placed below the suction table 78 . A slit 77 is provided in the suction table 78 in the area where the air collides with the air from the blow-off nozzle 104, and the cut edge of the paper web after longitudinal cutting passes through this part.
The paper dust remaining in the cutting section is blown away and reaches the opening 106 of the upper suction pipe 108.

A third suction device 84 is located behind the second suction device 82 with respect to the direction of movement of the web and is primarily mounted under the suction table 78 with the hose 11
It consists of a vacuum box 110 connected to 2. vacuum box 11
0 communicates with an elongated hole 114 made in the suction table 78, over which the cut edge of the web paper passes after longitudinal cutting. A further guide plate 116 is arranged behind the third suction device 84 in the direction of movement of the web, followed by a tension roll 118 .

The details of the third suction device are as shown in FIG. FIG. 8b is a cross-sectional view of the elongated hole 114 along line bb in FIG. 8a.

The left side of FIG. 8a schematically shows the upper cutter 72 and the lower cutter 74, and the right side, ie, in the direction of advance of the web, shows the suction table 78 and the vacuum box 110 below it. The right side of the suction table is connected to the tension roll 118 described above. Here, the tension roll is important in pulling the web past the suction table.

As is clear from FIG. 8b, the slit 114
Edge 79 of slit 114 perpendicular to the longitudinal direction of
is bent downward. The radius of this curvature is approximately 3 mm when new, and changes as it wears out. The width of the slit varies depending on the paper quality and is selected to precisely match the length of the slit. However, the cross-sectional area of the slit is related to the suction volume and the machine space. The slit is installed immediately after the vertical cutter, but it must also be installed in front of the horizontal cutter where tension is applied. It is not necessary to use a separate fixed vacuum box or suction table. In the case of a structure equivalent to this, it is also possible to use vacuum boxes connected to each other, and it is possible to change the orientation of the slit in the width direction in order to match the specifications of each paper.

As already mentioned, when the web cuts are successively passed over the slits 114 and air is sucked through the slits into the vacuum box, the folded edge 79 forms the web cuts in one or more layers. It helps to encourage. This not only makes the paper more pliable in the vertical cutter section, but also creates the effect of agitating any paper dust that still remains and sucking it into the vacuum chamber.

Even when cutting the web paper crosswise, it is necessary to remove paper dust at least.
A related suction device is shown in FIG. Inside the frame 120, two identical cutter drums 122 are rotatably supported, and the cutting blades 124 attached thereto contact each other in perfectly defined positions to make sharp cuts, so that the web is laterally be cut. A U-shaped beam 125 is attached to the lower part of the lower cutter drum 122 and covers at least the lower half of the lower cutter drum 122 to open the vacuum chamber 1.
26 is formed. A suction port 128 is formed in the beam 125 at the bottom of the vacuum chamber 126, and although not shown in the figure, a suction device is connected to this. A web guide plate 130 is also mounted in front of the cutter drum 122 in the direction of web movement from left to right, which is connected to the vacuum chamber 12.
6 is extended to the upper side of the cutter drum.

Since the paper is fed stably within the cross-cutting machine by guiding the web on the suction table 78 described above, cross-cutting can be performed without disturbance.

Finally, when ejecting the paper, especially when taking out the stack of paper,
Finally, the paper dust at the periphery of the paper bundle is suctioned to remove the remaining paper dust. A related suction device is shown in FIG. A stack of papers R is stacked on the conveyor belt 132 shown in FIG. The side surface of the paper stack R is surrounded by a presser belt 134 rotating around a vertical axis, but a small gap is left between the paper stack and the presser belt. A vacuum box 136, a short pipe 138, and a hose 140 connected thereto are installed below the conveyor belt 132.
On the side of the vacuum box 136, there is a paper stack R and a presser belt 1.
There is a suction port 142 that opens into the gap between 34. When air is sucked through the hose 140, the paper stack R and the presser belt 134 are removed from the surrounding area along the arrow.
Air is sucked into the vacuum chamber 136 through the gap. At this time, paper dust remaining in the paper bundle is removed by suction together with the air flow.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

EXAMPLE Mixed and screened waste paper, consisting mostly of household goods catalogs and newspaper strips, was used as a concentrated pulp (Firma Lamort). A strong fiber friction treatment was performed at a temperature of approximately 45° C. for 25 minutes without soaking to disintegrate the fibers. At this time, the cellulose concentration due to disaggregation was approximately 14%. After separating the coarse and difficult-to-decompose parts using a sorting drum and a variable-speed thick-component centrifuge, the cellulose suspension is passed through a fine-slit sieve in the sorting stage to a cellulose concentration of approximately 3%. Processed up to. At this time, fresh pulp with a uniform cellulose concentration was obtained. The printing ink was then separated at a component concentration of about 1% using a conventional deinking equipment having two porous columns. Hole diameter is 1.6mm
After pressure sorting using a perforated plate (Lochsieb),
The resulting discharged components (Spuckstoff) were re-sorted by using a notched basket (Schlitzkorb). The selected good components were first concentrated using disk filtration to a solid content of 14%, then diluted to a solid content of 3.5%, and then concentrated to a solid content of 28%.
%. After treatment at 95 DEG C. in a dispersion bath, bleaching with peroxide or sodium dithionite (approximately 6%, 50-60 DEG C.) was then carried out. The resulting paper stock was run through a conventional paper machine. The paper thus produced was cut under the conditions shown below.

The upper and lower blades of the vertical cutter and horizontal cutter were placed so that they were never at an angle to each other, and the effect of the lower blade coated with WIDIA alloy was controlled during work. Dust removal is shown in Figures 5 to 1.
It was carried out using the apparatus shown in detail in Figure 0. The obtained paper not only had significantly less paper dust on the vertical sides, but also had very little paper dust adhering to the surface or horizontal sides. These were demonstrated using the adhesive tape method and surface paper dust measurement method described above.
The adhesion degree of paper dust on the vertical edges and horizontal edges, and the dust value on the paper surface obtained from 10 series of DIN A4 paper (1 series is 500 sheets, each measured 3 times) are as follows. It is.

Vertical edge (corrected whiteness difference) = 2.8 to 4 Horizontal edge = 0.6 to 0.9 Dust value of paper dust on the surface (grained side (back side) and front side) = 2.2 to 2.5 This paper has the following configuration .

Water content was 4%, ash content was 16%, and lignified fibers (groundwood pulp) accounted for approximately 80% of the remaining paper fibers (remaining fibers: cellulose fibers).

This paper was colored yellow and exhibited 80% whiteness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the stretching device. Figure 2 is a side view of a load roller used for testing paper dust on the edge of paper.
Figure 3 shows the shortened measuring tube of the Hunterlab measuring instrument. FIG. 4 is a diagram showing the uncorrected and corrected whiteness differences observed by measuring the vertical edges of various papers. FIG. 5 is a schematic side view of a standard paper making machine equipped with individual workstations. Figure 6 shows a paper alignment device assembled integrally with a paper powder suction device. 7th
The figure is a cross-sectional view of a vertical cutting machine with three suction devices. 8a is an enlarged view of the suction device shown in FIG. 7, and FIG. 8b is a sectional view taken along line bb in FIG. 8a. FIG. 9 is a cross-sectional view of a horizontal cutting device equipped with a paper powder suction device. FIG. 10 is a sectional view of the paper feeding device shown in FIG. 5, which is equipped with a paper powder suction device. 10... Base plate, 12... Hydraulic pump, 14...
Electric switch, 16... button, 18... partition plate, 20... hydraulic power machine, 22... hydraulic conduit, 2
4... Manometer, 26, 28... Tightening plate, 32... Core, 34... Outer cover, 36... Handle,
38... Journal, 40... Hole, 42... Support shaft, 44... Connecting rod, 46... Ring ring, a... Vertical cutting section, P... Rolling paper, 80... First paper powder suction device , 84...Second paper powder suction device, 82...Third paper powder suction device, 104...Blowout device.

Claims (1)

[Scope of Claims] 1 Paper manufactured by performing the various steps of disintegrating, deinking, and sorting, and then using the sorted and prepared waste paper after passing through the dispersion and bleaching steps, and making the paper using a paper machine, in the cutting step. (a) Paper feeding to the vertical cutter, (b) Cutting with the vertical cutter, (c) Paper feeding to the horizontal cutter, (d) Cutting with the horizontal cutter, and (e) After cutting with the horizontal cutter Dust is removed by suction means when paper is stacked, and the moisture content is 2 to 7% by weight relative to standard paper.
The ash content is 12 to 20% by weight, the lignified fibers account for more than 10% by weight of the remaining paper cellulose, and the whiteness is 65 to 91. The adhesion degree Mv of paper powder on at least one vertical side corresponding to the luminous reflectance value measured in
6. Degree of adhesion of paper powder on at least one horizontal side corresponding to the luminous reflectance value also measured using the adhesive tape method
A method for manufacturing standardized paper with less paper dust and Mv of 1.5 or less. 2. The method of claim 1, further comprising filtering the circulating induced size liquid. 3. In the case of longitudinal cutting, the paper strip guided over a breaker strip with a built-in suction dust remover is blown during cutting to remove the generated dust, after which the longitudinal cutting is finished. The paper strip is guided onto a suction table with a slit, the vertical edge of the paper strip is aligned exactly over the slit, the dust generated thereby is removed again, and then a horizontal blade is inserted. 3. The method according to claim 1 or 2, which comprises removing the dust by suction. 4. The method according to item 3, which comprises sucking and removing dust generated in the reams of paper stacked in the horizontal groove. 5. The method according to item 4, wherein the vertically cut paper strip is guided onto a slit that is curved inwardly perpendicular to the conveying direction of the paper strip. 6. The method according to item 4 or 5, wherein the dust removal effect is improved by providing an effective brush on the slit. 7. The method according to any one of items 3 to 6, which comprises sucking and removing dust in the region of the lower blade of the vertical cutter portion. 8 Household goods catalogs, illustrated advertisements (Illustriert
-enverschnitt), returned printed matter, newspapers, and magazines, and uses waste paper that has been selected in advance for the production of paper stock. 9 In the lower blade area and/or suction table area
The first one maintains the vacuum during suction dust removal at approximately 250 to 40 mbar at cutting speeds of 100 to 400 m/min.
The method according to any one of Items 1 to 8. 10 In the case of longitudinal cutting, the paper strip guided over the breaker strip with built-in suction dust removal device is blown with air during cutting to suction and remove the generated dust, after which the paper strip is Guide the finished paper strip onto a suction table with slits,
Align the vertical edge of the paper strip exactly over the slit,
The method according to item 1 or 2, which comprises sucking and removing the dust generated thereby again, and then blowing away the dust generated by inserting a horizontal blade and removing it by suction. 11 The 10th step consists of blowing away and suctioning away the dust generated in the paper reams stacked in the horizontal groove.
The method described in section. 12. The method according to claim 11, wherein the longitudinally cut paper strip is guided onto an inwardly curved slit perpendicular to the conveying direction of the paper strip. 13 Item 11 or 1 to improve the dust removal effect by providing an effective brush on the slit
The method described in Section 2. 14. The method according to any one of items 10 to 13, which comprises sucking and removing dust in the region of the lower blade of the vertical cutter portion. 15 Any of paragraphs 10 to 14, in which waste paper selected from among household goods catalogs, illustrated advertisements (illustriert-enverschnitt), returned printed materials, newspapers, and magazines is used for the production of paper stock, and which has been selected in advance. The method described in. 16. The method according to any one of paragraphs 10 to 15, wherein the reduced pressure during suction dust removal in the lower blade area and/or suction table area at a cutting speed of 100 to 400 m/min is maintained at approximately 250 to 40 mbar. .