JPH0524724A - Manufacture of newsprint roll - Google Patents

Abstract

PURPOSE:To prevent an unpacked bare roll paper from breaking during transportation by applying a friction factor increasing agent to one side of newsprint in the specified range from the roll end, winding in a dynamic friction factor of the part, to which friction factor increasing agent is applied, lower than the specified value and larger than that of the outer surfaces of woodfree paper, and making the difference between them 0.14 or more. CONSTITUTION:In a paper manufacturing machine, newsprint is manufactured and is wound around a reel forming a jumbo paper roll, and then, the jumbo paper roll is cut into newsprint roll by a winder. In such newsprint roll manufacturing process, friction factor increaser in spreyedly applied on one side of roll end newsprint in the range of 7 to 25m. The dynamic friction factor mu2 based on JISP8147 between the parts of newsprint, which friction factor increaser are applied to and constitute a part of the newsprint roll, is taken in the range 0.45 to 0.70 and is made larger than the dynamic friction factor mu1 between the outer surfaces of A9 woodfree roll paper and other B10 woodfree roll paper, and the difference mu2-mu1 between them is made 0.14 or up.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing newsprint rolls used in a printing plant. More specifically, the present invention relates to a method for inexpensively and easily manufacturing a newsprint roll in which the upper paper of the wind roll is not easily torn even by an impact force caused by collision between the wind rolls during transport of the wind roll.

[0002]

2. Description of the Related Art In recent years, automation in printing plants has been significantly improved in all aspects. For example, in some newspaper printing factories, almost all operations from the loading of newsprint rolls into a paper warehouse to the unpacking of wrapping paper and the feeding of paper to a rotary press are almost completely automated. In each automated process, it is general to judge whether the process is normal or abnormal by a sensor, and if it is abnormal, stop the process for safety and check it.

In the winding operation carried into a paper warehouse, the unwrapping is performed in advance to remove the wrapping paper, and it is often handled in a bare form, that is, in the form of a winding cloth, and the printing speed of the printing machine is improved. There is an increasing demand for an increase in the number of winding stations for the purpose of reducing the number of times of feeding to the rotary press. As a result, the diameter of the winding becomes significantly large (larger diameter), and the weight of the winding increases accordingly. In recent years, newsprints have been rolled up to 60 pieces, and their weight is about 1.
It reaches 2 tons.

FIG. 1 is a schematic diagram showing the flow of bare winding which has been unpacked and carried into a paper warehouse of a printing factory for printing newspaper. On the floor of a paper warehouse for such newsprint printing factories, there is usually an inclination of 1 to 2 ° from the loading side to the unloading side. Is moved to a row with less winding, and is pushed out from the upper side of the inclined surface to the lower side, that is, from the carry-in side to the carry-out side by the moving pusher. It stops by colliding with the stopper provided in. continue,
The windings pushed out one after another collide with the previously stopped winding and are stopped. In this way, 4-5 rolls are always placed in contact with each other at one place where one stopper is left. After that, these windings are sequentially sent out to a stopper provided below the unloading conveyor before the unloading surface, placed on the unloading conveyor depending on the unloading status of the winding, and sent to the rotary press. The same state as above is repeated at the place where this stopper is installed. The number of rows in the winding flow direction depends on the size of the printing plant.

[0005] In such a paper warehouse, some papers on the front surface side (top paper) of the winding may be torn by an impact generated by a collision of the winding stopper and the winding. This is because the paper strength of newsprint is weaker than that of other printing papers, and the weight increases with the increase in the number of winding stations for the reason described above, so that the impact force is further promoted.
The probability of breakage is even higher than before.

[0006] Since the last end of the unwrapped unwrapped top paper is usually fixed with gum tape, adhesive tape, etc. When the tear spreads to the paper break, leave only the length corresponding to the outer circumference of the broken paper on the floor, or roll the paper and roll the floor to the carry-out conveyor. Either it reaches the end, or some of the top paper of the winding remains loose in the winding, and is finally put on the carry-out conveyor. At this time, the take-up detection sensor installed on the inclined surface is blocked by the broken pieces of paper and loose paper left on the floor surface, causing a trouble that the operation of the carry-out conveyor is stopped due to a malfunction, resulting in printing. The supply of the necessary winding material becomes insufficient, and the printing process must be stopped. When such a trouble of stopping the carry-out conveyor occurs, the operation of the process is temporarily stopped, and the worker must remove the broken piece of paper, which loses the meaning of labor saving by automation. . Moreover,
When such a problem occurs in a printing factory of a newspaper company for newspaper printing, where the demand for immediacy is extremely important, it is unacceptable because it may cause late delivery of the newspaper.

In order to solve such problems, various attempts have conventionally been made to improve the winding manufacturing method and the equipment. For example, the improvement in the manufacturing method of the winding is (1) a method of increasing the sticking tension by winding the adhesive tape around the outer circumference of the winding to fix the final end of the upper paper of the winding, (2) the paper itself. To increase the strength, (3) To change the composition of the pulp fiber of the paper itself that constitutes the winding in order to mitigate the impact when the winding collides with the stopper or other winding and comes into contact with it. Can be mentioned.
However, none of the methods and the combination thereof can completely eliminate the breakage at the time of collision of the winding.

On the other hand, in terms of equipment for transporting the take-up roll, the scratch force that causes the tear of the top paper of the take-up roll should not be scratched, and the impact force should be applied when it collides with a take-up stopper or another take-up roll. The following attempts have been made for the purpose of alleviation. (1) Finishing of surfaces such as stoppers installed on the floor and slopes of paper warehouses that come into contact with winding, painting or applying Teflon sheet enough to prevent protrusions (2) A method of spraying a lubricant such as talc or baby powder on an inclined floor surface for the purpose of lowering the dynamic friction coefficient of the surface of the paper roll can be mentioned, but this has not been a fundamental solution. In particular, the method of spraying the lubricant on the floor surface is not preferable because the worker must regularly spray the lubricant, which causes an increase in cost and burden on the worker.

However, in a newly constructed printing factory, it is possible to minimize the inclination angle of the floor surface to be inclined to reduce the impact force caused by the collision of the rolled paper roll. In fact, there are many printing factories that are effective by combining these measures to prevent equipment breakage, but improvements in these facilities may only be possible within the overall layout of the printing plant. In many cases, it is not always possible to improve equipment, and problems such as equipment cost and construction period are involved, so this is not a satisfactory solution.

Looking at this problem from the standpoint of producing newsprint, since the problem in terms of equipment belongs to the printing plant to the last, we would like to somehow solve it with a problem solving method for papermaking. Would be appropriate. Therefore, there has been a demand for the appearance of newspaper roll-up, which is less likely to be torn even if the roll-up paper is handled in the paper warehouse with the current equipment of the printing plant.

In response to this, the present inventors have added hydrated silicates for papermaking as a filler to a papermaking raw material as a friction coefficient increasing agent to increase the friction coefficient of paper and to make newsprint on a paper machine. However, when cutting the product with a winder after jumbo winding on a reel, at least one selected from hydrated silicates for papermaking, styrene or acrylic polymers as a friction coefficient increasing agent of the newsprint is used as a friction coefficient increasing agent. It was proposed to apply or spray on one side. However, not denied may become inevitably high cost due to the use of expensive chemicals in these methods, has been desired that the appearance of methods that can be easily further inexpensively addition operation.

[0012]

DISCLOSURE OF THE INVENTION In view of the above situation, the inventors of the present invention have conducted further diligent research on the problems of the prior art, and as a result, newsprint is made by a paper machine and wound by jumbo winding by a reel. In the production of newsprint rolls that are cut into product rolls with a winder, the friction coefficient increasing agent is sprayed and applied only to one side of the top of the newspaper rolls, which corresponds to several sheets. , The dynamic friction coefficient according to JIS P8147 between the outer surface of the top paper of the product after winding the newsprint paper and the top paper of another paper roll is μ1, the part close to the coated top paper constituting the winding Let μ2 be the coefficient of dynamic friction between the two papers (front and back sides), and make μ1 as small as possible, so that (μ2-μ1) is above a certain level, the value of μ2 above a certain level is close to the top paper. Manufacturing rolls of newsprint with As a result, it has been found that it is possible to prevent tearing of the upper paper of the winding due to collision between the windings in the paper warehouse, and the present invention has been completed.

Accordingly, an object of the present invention is to wind up a newspaper in a printing factory having the present equipment, in which tearing of the unwrapped top paper is unlikely to occur while the unwrapped bare winder is conveyed. It is to provide a method of easily and inexpensively manufacturing.

[0014]

SUMMARY OF THE INVENTION A first aspect of the present invention is to wind newsprint on a paper machine, which is wound into jumbo rolls by a reel and then cut into product rolls by a winder. In the production of the take-up, the friction coefficient increasing agent is sprayed and applied to one side of the end of the newsprint in the range of 7 to 25 m, and the applied part constituting the take-up after the take-up of the newsprint is taken up. The coefficient of dynamic friction μ2 between papers according to JIS P 8147 is 0.45 or more and 0.70 or less, and is larger than the coefficient of dynamic friction μ1 between the outer surfaces of the upper paper of the winding and another upper paper of another winding, and the difference (μ2-μ1 ) Is 0.14 or more. A second aspect of the present invention is that the friction coefficient increasing agent is a hydrated silicate for papermaking,
The method according to the first aspect of the present invention is characterized in that it is at least one selected from styrenic or acrylic polymers.

According to the present invention, as shown in FIG. 2, the winding A having a mass of mKg is rolled at a speed of vm /
It is assumed that the robot collides with the winding B that is stationary in seconds. The momentum m × v of the winding A is expressed by the following equation, assuming that the winding A collides with B and receives the force of F and stands still after t seconds.

[0016]

[Formula 1] mv = Ft

It is clear that the breakage of the winding paper becomes larger as the impact force F becomes larger, and in the formula (1), the factors are the winding weight m and the collision speed v. It is shown that F increases as it increases. Also, the speed v
In addition to the large inclination angle θ of the slope, the rolling resistance (that is, the speed v increases as the winding is harder) and the coefficient of restitution (that is, the time t under the force of F changes). It is not easy to calculate the force F generated when the windings collide with each other based on pure kinematics and dynamics. However, on the contrary, when a rigorous calculation is performed, the winding itself is not uniform, and the force F at the time of collision is significantly affected by a slight difference in the initial condition such as the initial speed when the winding is rolling. Therefore, it is not practical.

On the other hand, if the force when a winding roll collides with another winding is set to a known value F0, a frictional force is applied to the top paper of the winding roll at the time of the collision, so this frictional force and the tension of the paper are balanced. Examining is a means of clarifying the phenomenon of tearing of the paper roll.

As shown in FIG. 2, when the winding A rolls over and collides with the stationary winding B, the winding A,
It is assumed that the force of F0 is applied while both B are in contact with each other at point P.
At this time, the dynamic friction coefficient between the upper papers of winding A and B is μ
When it is set to 1, the friction force of μ1F0 works on the upper paper of the winding A,
That is, the frictional force Fs (Fs = μ1F0) is applied as a pulling force in the circumferential direction on the winding upper paper, and becomes a driving force for breaking the upper paper. Therefore, at this time, if the dynamic friction coefficient between the papers that make up the web is small, one upper paper will receive the force, but only if the paper force is smaller than Fs. This means that the paper is easy to break.
However, if the dynamic friction coefficient between the papers making up the take-up is large, the entire take-up behaves as if it were a single sheet of paper. Therefore, the friction force generated at the time of this collision is received by the whole take-up paper. Therefore, the probability that the top paper of the roll will break will be extremely small.

Considering in this way, the condition that the top paper of the winding is not broken is that the force of the newsprint constituting the winding is fp.
It is necessary that the sum of the frictional force μ 2 f on the inner side of the winding upper paper is larger than the frictional force on the outer surface (the surface of the winding) of the winding upper paper.

[0021]

[Formula 2] fp + μ2 f> μ1 f That is, fp> f (μ1 −μ2) where f: force per unit width of the paper constituting the winding at the time of collision between the windings fp: constituting the winding Paper force per unit width of a sheet of paper μ1: Coefficient of dynamic friction between the outer surfaces of the winding upper paper μ2: Coefficient of dynamic friction between newspapers that make up the winding of the winding paper.

Equation 2 shows that the smaller the dynamic friction coefficient μ1 between the outer surfaces of the upper paper being wound, the less restrictive the paper force of the newsprint being wound (that is, even if the absolute value of the paper force is small). It is also shown that as the dynamic friction coefficient μ2 between the newspapers constituting the winding is increased, the paper force of the newspapers is not limited as described above. The fact that reducing the dynamic friction coefficient μ1 between the outer surfaces of the top paper of the winding is effective in preventing tearing is that talc is generated on the outer surface of the winding when handling bare winding in a paper warehouse of a printing factory. It is also clear from the fact that when a lubricant such as baby powder is sprayed, it is possible to effectively prevent the top paper of the roll from breaking.

However, in actual operation, the phenomenon is
It is very complicated, there is no way to know how much force the winding itself has at the time of collision, and the weight of the winding,
There is considerable variation in the paper force and the coefficient of dynamic friction of the newspapers that make up the winding, and the difference in the coefficient of dynamic friction (μ1 − μ
Since it is not perfect just because 2) is small, in the present invention, (μ1−μ2) is in the range of −0.35 or more and −0.14 or less, that is, the difference (μ2−μ1) is 0.14 or more and 0.35 or less. Under such conditions and the coefficient of kinetic friction between newspapers near the top paper that constitutes the winding μ
It is essential that 2 is 0.45 or more and 0.70 or less.

The coefficient of dynamic friction of paper depends on the type of pulp used,
In the case of the present invention, depending on the filler, the surface property of the paper, etc.,
μ2 is at most about 0.44 when not sprayed, and when applied, it is about 0.70 even if the coating amount is increased. Also, the riser is not applied to the outer surface of the winding paper.
In addition, since the friction coefficient decreases due to contact with the ground or floor surface during transportation, μ1 is limited to about 0.33 at most, so when friction coefficient increasing agent is not applied (μ2-μ1)
Is about 0.11 as the upper limit.

In the present invention, as a method for increasing the dynamic friction coefficient between the papers constituting the winding, the papermaking of newsprint is completed, and the winding of the jumbo winding on the reel of the paper machine is performed by the winder. When cutting into the winding, not the whole winding, but the length equivalent to several sheets from the top paper of the product winding (the diameter of the product winding is average.
If the length is 1 m, the length of one piece of the top winding will be a little over 3 m). Only one side (reverse side) of the paper in the range of 7 to 25 m, which corresponds to the length of 3 m, is made from hydrated silicate for papermaking, styrene-based or acrylic-based polymer. A method of spraying at least one selected is preferably used. In the present invention, the length of the atomized winding is 7 m.
If it is less than 25 m, it is not suitable because the paper force that can absorb the impact at the time of collision cannot be obtained, and spraying to a length exceeding 25 m can be expected to be effective, but it only causes mischief and cost increase. So unsuitable.

According to the method of the present invention, when the rolls composed of the newspaper specified as described above collide with each other, only a few sheets of the top paper behave as if they were a single sheet of paper, which is substantially enhanced. It succeeded in greatly reducing the amount of expensive friction coefficient increasing agent applied by absorbing the shock generated at that time by the applied paper force. It is preferable that the hydrated silicate for papermaking has a particle ratio of at least 80% in the particle size range of 1 to 30 μm and an average particle size of 5 to 10 μm with a particle ratio of 70 μm or more at least 0.4%. Is. When spraying the above-mentioned friction coefficient increasing agent, when the jumbo winding wound by the reel is cut into the product winding by the winder, the gas-liquid 2
A fluid spray is used to coat one side of the paper at a coverage of 0.05 to 0.3 g / m ² . If the spray amount is less than 0.05 g / m ^2, it is insufficient to increase the dynamic friction coefficient.
If it exceeds g / m ² , the effect will reach the ceiling, and the amount beyond this is not suitable.

Since the after-dryer is not used in the spraying method using the winder, the solid content concentration of the spraying liquid used is within the range of the above spraying amount so as not to increase the water content of the paper more than necessary, and 10 to 30% by weight. The spraying condition is appropriately selected and used within the range of%.

In recent paper machines for newsprint, a twin wire system is often adopted for the purpose of eliminating the difference between the front and back sides of the paper, but even the wire side is usually the first wire side (upper side), It is customary to have the second wire surface (lower side) as the back surface, and in newspaper winding, the second wire surface is wound so that the second wire surface is on the outside.

The pulp raw materials used in the newsprint of the present invention include bleached softwood kraft pulp (NBKP), bleached hardwood pulp (LBKP), thermomechanical pulp (TMP), ground pulp (GP) deinked waste paper pulp (DIP). And the like, these are appropriately combined as desired, and when papermaking newsprint, a paper strength enhancer, a retention aid, and other papermaking chemicals are used, if necessary. After the papermaking, it is possible to carry out smoothing treatment with a machine calendar, a super calendar or the like according to the required printability.

According to the present invention, when the friction coefficient increasing agent is cut into the product winding in the winder by the spray method, it is applied to one surface (front surface) within a range of 7 to 25 m from the winding end of the winding to form the winding. The dynamic friction coefficient μ2 between the coated papers should be 0.45 or more and 0.70 or less, and it should be larger than the dynamic friction coefficient μ1 between the outer surfaces of the top paper of the winding, and the difference (μ2
By setting −μ1) to 0.14 or more, it is possible to absorb the frictional force generated due to the collision between the windings in several sheets near the upper paper of the winding when it is transported in the paper warehouse. It is possible to prevent the outer surface of the winding top paper from being torn, and therefore to smoothly transport the winding in the paper warehouse, eliminating the problem of temporary stoppage caused by the delay in feeding in the printing process. In addition, printing and delivery of printed matter can be smoothly performed. Further, according to the present invention, as compared with the method of making a paper by adding a friction coefficient increasing agent internally, it is easy to obtain a difference in dynamic friction coefficient between the upper paper of the winding and the papers constituting the winding, and the friction coefficient increasing agent. Compared with the method of coating or spraying on one side of the roll, it has an effect that the product roll can be manufactured very inexpensively and easily.

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In Examples and Comparative Examples,% and parts mean% by weight and parts by weight.

Example 1 16 parts of softwood kraft pulp, 46 thermomechanical pulp
Part, ground pulp 5 parts, deinked waste paper pulp (newspaper) 33
Part of the mixture was mixed and disintegrated, and the freeness was adjusted to 110 ml C.SF (Canadian standard freeness) with a refiner to prepare a stock. Then, using this stock, Bellbeformer II
Paper making at a paper making speed of 1000 m / min with a model paper machine (manufactured by Mitsubishi Heavy Industries, Ltd.), passing through a machine calender, basis weight 47 g / m ² , tensile strength 3.5 Kgf / 15 mm, paper moisture 8.3%, paper constituting winding Jumbo winding of newsprint paper with a dynamic friction coefficient of μ 2 0.41 was manufactured.

From this jumbo winding, the product is wound in a winder (A winding, 40 continuous winding, weight of winding 820 K
When cutting into g), a styrene-acrylic copolymer emulsion with a solid content of 25% (trade name: ATS-8, manufactured by Dick Hercules) is used with a liquid-gas two-fluid sprayer at a gauge pressure of 2 Kg. / Cm ² on the surface of the paper, spraying only 10m from the end of the winding (corresponding to 3 laps of the winding paper), and winding so that the coated surface is on the inside of the winding paper. 10 rolls were manufactured. At this time, the amount of application on the surface of the paper by spraying was 0.1 g / m ² , the water content of the sprayed part was 8.6%, and the coefficient of dynamic friction μ 2 of the coated part which also constitutes the winding was 0.47.

These windings were created assuming the floor in the paper warehouse of the printing factory. The length of the inclined surface is 7.5 m and the inclination angle of the floor is 1.
Roll the rolls from the top of the 9 ° test slope, and place the three rolls side by side with the stopper installed at the bottom end of the slope to roll the rolls.
When the wind-up collided with another wind-up, the occurrence of breakage of the top paper of the wind-up was examined, but no breakage occurred. The coefficient of dynamic friction μ1 between the outer surfaces of these rolls is 0.32.
The difference from 2 (μ2-μ1) was 0.15.

The methods for measuring the coefficient of dynamic friction, freeness and tensile strength used in the present invention are as follows. (1) Dynamic friction coefficient According to the method of JIS P 8147, a horizontal digital friction coefficient measuring device (manufactured by Sagawa Seisakusho) was used to measure the tensile speed at 200 mm / min. (2) Freeness The freeness was measured using a Canadian standard type drainage tester specified in JIS P 8121. (3) Tensile strength It was measured using an auto paper strength tester (manufactured by Toyo Seiki Seisakusho) according to the method specified in JIS P 8113.

Comparative Example 1 Ten product windings (A winding, 40 continuous, winding weight 820 kg) were produced from the jumbo winding produced in Example 1 in a winder without spraying the friction coefficient increasing agent. did. When the situation of occurrence of breakage of the top paper was examined in the same manner as in Example 1 by winding these rolls, breakage occurred in two rolls and the occurrence rate was 20%. The coefficient of dynamic friction μ1 between the outer surfaces of these rolls is 0.30, and (μ1 − μ2) is 0.11.
Met.

Example 2 13 parts of softwood kraft pulp, 40 thermomechanical pulp
Parts, 5 parts ground pulp, 42 parts deinked waste paper pulp and mix to disintegrate, 110 ml freeness in refiner
It was adjusted to CSF and used as paper stock. Then, using this paper stock, paper was made at 1100 m / min in a Bellbeformer II type paper machine, passed through a machine calender, basis weight 47 g / m ² , tensile strength 3.5 Kgf / 15 mm, paper moisture 7.8%, winding Jumbo rolls for newspaper printing were manufactured with a coefficient of dynamic friction μ2 of 0.43.

A styrene-acrylic copolymer emulsion having a solid content of 25% (trade name: ATS-8 was used by using a liquid-gas two-fluid spray when cutting from the jumbo winding to the winding of the product in a winder. , Dick Hercules) is sprayed on the surface of the paper with a gauge pressure of 2.5 Kg / cm ² to a length of 10 m from the end of the winding (corresponding to 3 laps of the winding paper), Winding so that the sprayed surface becomes the inner surface of the top paper (A winding, 50
Twenty pieces of continuous charge, weight 1043 kg) were produced. At this time, the coating amount on the paper surface is 0.3 g / m ² , and the water content of the sprayed part is 8.
The coefficient of kinetic friction μ2 of the coated part of the paper making up the winding was 0.56, and the difference from μ1 (μ2-μ1) was 0.23. When the occurrence of breakage of the top paper was examined in the same manner as in Example 1 by winding these rolls, no breakage occurred.

Comparative Example 2 Twenty product windings (A winding, 50 continuous, weight 1043 Kg) were produced from the jumbo winding produced in Example 2 in a winder without spraying the friction coefficient increasing agent. When the situation of occurrence of breakage of the top paper was examined in the same manner as in Example 1 by winding these rolls, breakage occurred in 3 rolls and the occurrence rate was 15%. The coefficient of dynamic friction μ1 between the outer surfaces of these rolls of paper is 0.33, and the difference from μ2 (μ2-μ1) is 0.
Was 10. The results obtained in Examples 1 to 2 are shown in Table 1.

[0040]

[Table 1]

[0041]

EFFECT OF THE INVENTION The method for producing a newspaper printing take-up according to the present invention is such that the paper which has been subjected to paper making in a paper machine is taken up by a reel for jumbo take-up and further cut by a winder for product take-up. The friction coefficient increasing agent is applied by spraying on one side (surface) of a length equivalent to several sheets from the top of the take-up paper, and the dynamic friction coefficient μ2 between papers corresponding to the applied part that constitutes the winding is 0.45 or more. By setting it to 0.70 or less, making it larger than the dynamic friction coefficient μ1 between the outer surfaces of the winding paper and making the difference from μ2 (μ2-μ1) 0.14 or more, it is possible to wind the paper in the paper warehouse of the printing factory. The frictional force generated due to the collision between the take-up rolls can be absorbed by a few pieces of top-up paper that behave as if it were a top-up top paper, which prevents breakage of the top-up paper roll. Therefore, the winding Since it can be performed smoothly, the trouble of a temporary stop caused by a delay in the printing process is solved, printing and delivery of printed matter can be performed smoothly, and further, such winding is easy, The effect that it can manufacture at low cost is produced.

[Brief description of drawings]

1A and 1B are a schematic elevation view and a side view showing a flow of unwinding, which is carried into a paper warehouse of a printing factory for printing newspaper, after unpacking.

FIG. 2 is a schematic view showing a contact state of two windings on an inclined surface of a paper warehouse.

[Explanation of symbols]

1 .... Conveyor port 2 .... Movement pusher 3 .... Conveyor 4.・ ・ ・ Rolling paper 5. ・ ・ ・ Stopper 6. ・ ・ ・ Movement stopper 7. ・ ・ ・ Outgoing port (to rotary press) 8. ・ ・ ・ Inclination angle, θ 9. ・ ・ ・ Winding A 10. ... Winding B 11 .... Force applied while winding A is rolling and in contact with winding B, F0 12 .... Contact point between winding A and B, P 13.・ Distance that winding A and B move after contact, S 14 ..

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 29, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

According to the method of the present invention, when the rolls composed of the newspaper specified as described above collide with each other, only a few sheets of the top paper behave as if they were a single sheet of paper, which is substantially enhanced. It succeeded in greatly reducing the amount of the effective friction coefficient increasing agent applied by absorbing the impact generated at that time by the applied paper force. The hydrated silicate for papermaking has a particle ratio of at least 80% in the particle size range of 1 to 30 μm and a large ratio of 70 μm or more.
It is also preferable that the average particle size of 0.4% or less is in the range of 5 to 10 μm. When the above-mentioned friction coefficient increasing agent is sprayed, a gas-liquid two-fluid spray is used to cut the jumbo winding wound by the reel into the product winding by the winder, and 0.05 to 0.3 is applied to one side of the paper. The coating amount is in the range of g / m ² . The spray amount is less than 0.05 g / m ² is insufficient to raise the dynamic friction coefficient, the effect exceeds 0.3 g / m ² becomes plateau, further amounts are not suitable.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location D21H 23/50 (72) Inventor Shigeru Emaeda 2-1-1 Ojimachi, Tomakomai City, Hokkaido Oji Tomakomai Mill, Paper Manufacturing Co., Ltd.

Claims (2)

[Claims] Claims: 1. In the production of newsprint rolls in which newsprint is made by a paper machine, wound on jumbo rolls by reels, and then cut into product rolls by a winder, Dynamic friction coefficient according to JIS P 8147 between the coated papers that constitutes the roll after the newspaper is rolled up by spraying and coating the friction coefficient increasing agent on one side within the range of 7 to 25m from the end of the roll. Set μ 2 to 0.45 or more and 0.70 or less, and make it larger than the dynamic friction coefficient μ 1 between the outer surfaces of the upper paper of the winding and another upper paper of another winding (μ 2 −μ 1)
A method of manufacturing a roll of newsprint, characterized in that 2. The method according to claim 1, wherein the friction coefficient increasing agent is at least one selected from hydrated silicates for papermaking, styrenic or acrylic polymers.