JPH07115781B2 - Manufacturing method of coreless large-diameter paper roll and coreless large-diameter paper roll manufactured thereby - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a coreless large-diameter paper roll and a coreless large-diameter paper roll produced thereby. The large-diameter paper roll that is the object of the present invention is a raw roll in a production line such as paper processing,
Installed on a paper processing machine, manufactured and processed for unwinding,
A general roll of roll of paper Paper rolls are used as household paper such as tissue paper, pocket tissue paper, kitchen towel paper, diapers,
Rolls of generally soft paper such as napkin paper, rolls of rigid paper quality for industrial use such as newsprint, high-quality paper, kraft paper, art, coated paper, general wrapping paper, etc. ~ 2000mm, roll width
The diameter of the inner hole of the core is 38 mm to 20.
It is about 0 mm.

[0002]

2. Description of the Related Art Conventionally, a paper roll having a large diameter uses a paper tube that serves as a winding core, and a web is wound around the paper tube. The finished paper roll is as shown in FIG. In addition, it had a paper tube c at the center. These paper rolls are mainly used as original rolls in the production line.However, when the original rolls are used up to the end, the production line is stopped for a long time until it is replaced with a new original roll and the threading is completed. Therefore, the new original fabric roll is usually attached to the line while leaving several layers of paper, and after the paper threading is completed, the used original fabric roll is removed from the line with the residual paper.
In addition, in order to change the product type, the original roll in the line may be removed with the residual paper.

[0003] The original roll that has been removed is usually shown in FIG.
As shown in (b), the residual paper Pa is cut off with a knife k or the like, removed from the paper tube c, put into a pulper (pulp making machine) or the like in the preceding stage of the papermaking line, and reused as a raw material. The paper tube c is made of thick and durable kraft paper or the like, and cannot be reused together because it is made of a different material from a soft paper roll. By the way, since it is a manual work to cut off the residual paper Pa with a knife or the like, a great deal of labor is required. In particular, the work of cutting with the knife k requires a considerable amount of physical strength and is also dangerous, so that it is very inefficient.

[0004]

However, the above-mentioned labor-intensive problem is that the core of the paper roll itself is made without using the paper tube c, and the web is continuously wound on the core to roll the large-diameter roll. If it is made, the used raw roll can be put into the pulper etc. as it is, so it can be solved at once. However, tissue paper and disposable diaper paper have a lower density and are crepe processed than industrial paper such as newsprint or corrugated cardboard, so they are highly flexible and very weak in strength. Therefore, it has been common technical knowledge until now that a paper roll cannot be manufactured without winding the paper tube c as a core. In other words, the idea of making a paper roll only with a web wound without using a paper tube was part of the industry as an idea, but even if you try to make a paper roll only with a web, it will become a reality. Despite the lack of enabling technology and potential demands, large diameter paper rolls without paper tubes have not yet been manufactured.

In view of such circumstances, it is an object of the present invention to provide a coreless large diameter paper roll and a method for producing the same.

[0006]

A method for producing a coreless large-diameter paper roll according to the present invention is a paper feed for feeding a web from a winding roll after paper making, paper-processing if necessary, and feeding the web to a winding part. It is composed of a processing part and a winding part for winding a web on a winding shaft in a roll shape to manufacture a coreless paper roll, and the winding shaft is provided in the winding cylinder in several rows extending in and out in the radial direction. The lugs and the tops of the lugs in the row of squares have an arc-shaped cross section and extend in the axial direction.
Using a paper winder consisting of a plurality of leaves, which are wide plate-shaped members, and an outer tube that covers the plurality of leaves so as to surround them and has good elasticity and slipperiness. , Applying a water-soluble glue to the web, and continuously winding the web onto the winding shaft without applying the glue after the middle winding period, and winding the winding part at the beginning of winding and the end of winding. It is characterized in that the take-up speed is made higher than the paper feeding speed of the paper feed processing part to wind the paper roll to form a paper roll, and after the winding process is completed, the leaf is contracted and the paper roll is taken out from the winding shaft.

The large-diameter paper roll of the present invention obtained by the above-mentioned manufacturing method is a roll wound only with a web, and the initial winding layer of the winding layer is tightly wound and only the web is wound. To form a hollow core, and a winding layer that is softly wound is formed on the outer layer of the hollow core to finish the paper roll.

[0008]

The large-diameter paper roll of the present invention is made of only the web forming the roll, and does not use a paper tube. Therefore, when the raw roll is lowered from the production line, it is directly put into a pulper or the like. Can be reused. Therefore, it is not necessary to separate the remaining paper and the paper tube with a knife as in the conventional case, and thus unnecessary labor can be omitted.

According to the manufacturing method of the present invention, a water-soluble glue is applied to the web at the beginning of winding to wind it, and the initial winding layers are adhered to each other. Then, by making the winding speed in the winding part faster than the paper feeding speed in the paper feeding processing part, even if the web is stretched by applying the glue of the aqueous solution at the beginning of the winding, the stretch is absorbed, and an appropriate amount is obtained. The web can be wound on the winding shaft by tension. Therefore, the winding initial layer can be made rigid and the winding initial layer can have strength as a hollow core. Also, at the end of winding, even if the paper is supplied at a speed faster than the mechanical part during deceleration due to the dynamic inertia, the winding speed in the winding part is higher than that in the paper feed processing part, so the paper overrun The run can be absorbed and can also be wound with appropriate tension. As a result, since the roll shape is fixed, the roll shape does not collapse for a long period of time.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 12 shows a typical paper roll winder currently used, and the mechanical parts thereof can be roughly classified into a paper feed processing part A and a winding part B.

The paper feeding processing part A is a papermaking process using a paper machine, and the web W is unrolled from a winding roll Ro which is usually wound up to a diameter of 800 to 2000 mm and a width of 1000 to 3000 mm, and paper processing is performed if necessary. The part to be supplied to the take part B There are various types of paper processing such as embossing processing, perforation processing, and crepe processing that are added in the paper feeding processing part A, and these processing mechanisms are appropriately incorporated in the paper feeding processing part A. In the illustrated embodiment, a perforation processing mechanism including a roller 20 and a cutter 21 is provided. Reference numeral 22 is a guide roller.

The winding part B is a part for winding the web W on the winding shaft 1 to manufacture the coreless paper roll R, and only the most important parts are shown in the drawings. That is, the winding part B is mainly composed of the driving rollers 2, 3, the riding roller 4, the nip roller 5, and the like. In the winding part B, the web W fed on the winding shaft 1 is wound while the driving rollers 2 and 3 are rotated, and the winding roller 1 is rotated by the riding roller 4.
The upper paper roll R is pressed.

The details of the winding part B will be described with reference to FIG. This figure shows the state of the beginning of winding the web W. The winding roll Ro after papermaking has a width of 800 to 3000 mm and is fed as wide as it is, but is cut by the cutter 6 into a paper width of 100 to 300 mm. Reference numeral 7 is a pedestal for receiving the paper roll R which has been wound up, and 8 is a knife which cuts the tail end of the paper roll R after winding is completed in the width direction. Reference numeral 9 denotes a spray nozzle, which sprays water-soluble glue for bonding the webs W at the beginning of winding to each other. In addition,
A transfer roll may be provided instead of the jet nozzle 9 to apply the adhesive to the web W.

Paper roll R that has been wound up first
When the web W is placed on the pedestal 7, the web W is cut by the knife 8 and the web W at the portion shown by the broken line is wound around the winding shaft 1 as shown by the solid line. Then, the water-soluble glue g for bonding is sprayed, the riding doll 4 descends, and the drive rolls 2 and 3 start to rotate. Since the web W is temporarily adhered to the winding shaft 1 and the winding layers of the web W by the adhesive action of the glue, the web W is wound by the rotation of the drive rollers 2 and 3, and the winding diameter of the paper roll R is gradually increased. I will do it. The period during which the water-soluble glue g is sprayed is called the initial stage of winding, and this period may coincide with the region where the winding speed increases or may partially overlap. As shown in FIG. 3, when the winding diameter of the toilet paper R becomes large to some extent, the medium winding period in which the toilet paper R is operated is started, and as shown in FIG.
When the winding diameter becomes large and approaches the finished size, the speed decreases and the winding stops at the end. In the figure, d1, d2, and d3 indicate the initial winding period, the intermediate winding period, and the final winding period of the winding diameter of the paper roll R.

FIG. 5 shows changes in the winding speed Sa and the paper feed speed Sb in the above-described single winding process.
In the figure, Sp is the winding speed, Tm is the winding time, and as shown in the figure, the winding speed Sb in the winding part B is the initial winding d1 with respect to the paper feeding speed Sa in the paper feeding processing part A. It is faster at the end of winding d3 and the same at the middle of winding d2.

According to the above-described winding method, since the paper feeding speed Sb is faster than the winding speed Sa at the initial winding time d1, the elongation of the web W due to the spraying of the glue is absorbed and an appropriate tension is applied. Since it is rolled up, the web can be rolled up tightly. In the middle winding period d2, since the winding speed Sb and the paper feed speed Sa match, the tension during winding gradually decreases, and the winding is performed softly. Further, at the end of winding d3, the winding speed Sb is faster than the paper feeding speed Sa, but the dynamic inertia in the paper feeding direction acts on the web W being wound, so the tension is reduced and the winding is still soft. To be As a result, a large-diameter paper roll is obtained in which the initial winding d1 is tightly wound, and the portion from the middle winding layer to the outermost layer is gradually softly wound.

By winding in this way, a paper roll R which does not lose its shape can be obtained. Since the glue sprayed in the initial stage of winding is water-soluble, after using the paper roll R as the original roll, the remaining paper Pa
When the remaining paper roll R (which is often glued to this part) is put into the pulper, the water-soluble glue is melted and the residual paper Pa is loosened, so it is easy to reuse as a raw material. .

The speed differences Sd1 and Sd2 between the winding speed Sb and the paper feeding speed Sa are determined in order to obtain the appropriate ratio of the web W elongation due to the spraying of glue, the deceleration ratio due to the influence of the dynamic inertia, and the appropriate tension. It can be calculated from the required speed difference. Normally, the speed differences Sd1 and Sd2 are about 10%, but of course, they may be lower or higher than 10% depending on the structure and performance of the winder, the paper quality of the web W, and the like. Further, in the example of FIG. 5, the winding initial stage in which the winding speed Sa is faster than the paper feed speed Sb coincides with the speed increasing region, but as shown in FIG. Alternatively, as shown in FIG. 7, the initial winding may exceed the speed increasing area and enter a part of the constant speed operation area. Similarly, at the end of winding, it may be a part of the deceleration region of the entire winding machine or a part of the constant speed operation region.

In the present invention, the speed may be finely adjusted to make the winding tension appropriate. It is, for example,
Since the web W is wound under tension, the drive roll 2 is accelerated by about 0.2% and the drive roll 3 is accelerated by about 0.3% with respect to the paper feeding speed in the paper feed processing part A. The riding roll 4 also accelerates by about 0.4%. Therefore, when the paper feed speed Sa is 1.00, the speed ratio is as shown in the table below. Table 1 Winding initial Medium winding Medium end Final winding Drive roll 2: 1.12 1.02 1.12 Drive roll 3: 1.13 1.03 1.13 Roll 4: 1.14 1.04 1.14 Paper feed processing part: 1.00 1.00 1.00

Next, details of the winding shaft 1 used in the winding part B will be described. FIG. 8 is a partially cutaway perspective view of the winding shaft 1 according to one embodiment of the present invention, and FIG. 9 is an enlarged sectional view of the winding shaft 1. 8 to 9, 1a is a reel cylinder,
It is a metal pipe with the rigidity required for a winding shaft.
Bearing portions 16 for supporting the winding shaft 1 during the winding operation are formed at both ends of the cylindrical body 1a. Inside the cylindrical body 1a, an elastic tube 17 made of rubber or urethane (see FIG. 9)
Is inserted in the elastic tube 17 so that air can be supplied to and discharged from the air supply port 15 provided at one end of the winding shaft 1. The elastic tube 17 is connected to the air supply port 15
The end that is not connected to is closed, and expands radially when air is injected and contracts when air is discharged.

The cylindrical body 1a is formed with long holes 14 at 120 ° intervals in the circumferential direction, and several holes are made at appropriate intervals along the axial direction. Then, the lug 12 is inserted into each of the long holes 14 so as to be retractable. A catch 18 having an arcuate cross section and extending in the axial direction is fixed to the lower end of the lug 12, and the catch 18 is located between the inner circumference of the tubular body 1a and the outer circumference of the elastic tube 17. In the present specification, the "row" means a group of elongated holes 14 or lugs 12 that are present on the same line in the axial direction. In the illustrated embodiment, each row 1
There are zero holes 3 and three rows of long holes 14 and lugs 12. Then, one leaf 10 is provided at the top of each row of lugs 12.
Is fixed. The leaf 10 is made of duralumin and may be integrated with the lug 12 or may be a separate body fixed by bolting or the like. The leaf 10 has an arc-shaped cross section and is a wide plate-shaped member extending in the axial direction. Therefore, when the leaves 10 are fixed to the lugs 12 in each row, a slight axial gap is formed between the adjacent leaves 10, but except for this, the outer periphery of the tubular body 1 is covered with the leaves 10 almost entirely. Will be seen. Of course, the circumference defined by the three rows of leaves 10 must be circular.

Although the winding shaft 1 of the above embodiment has three rows of lugs 12 and leaves 10, it may have four rows or more than five rows. Also, the number of each column is arbitrary,
The number may be 9 or less, or 11 or more. In addition, the leaf
10 may be fixed to each row one by one, or may be divided into two or more and fixed when the winding shaft is long. The outer tube 11 is provided on the outer circumference of the leaf 10 so as to surround it.
Is covered. The outer tube 11 may be any one as long as it has elasticity and good slidability, and, for example, a urethane resin tube or the like is preferably used.

In the embodiment having the above structure, when air is injected into the elastic tube 17 from the air supply port 15, the leaf 10 is bulged outward in the radial direction as shown in FIG. 10, and when the air is exhausted, it is shown in FIG. Thus the leaf 10 is retracted radially inward. In the winding shaft 1 of the present embodiment, when winding the paper roll R, as shown in FIG.
Is wound in the state of being bulged outward in the radial direction. In this case, the outer tube 11 exists on the outer periphery of the three leaves 10, and the outer peripheral shape thereof is almost a perfect circle.
The gap d between them is closed. And paper roll R
Since the inner peripheral surface of the above is in full contact with the outer peripheral surface of the outer tube 11, the paper roll R can be wound without using the paper tube as the core. Then, the reel 1 of this embodiment
When the paper is used, the paper is not pushed into or caught in the gap d, so that no ridge is formed on the inner peripheral surface of the cavity h of the paper roll R.

Since the roll is compressed during the winding operation, the shape of the paper roll which has been wound up is fixed, and the shape can be maintained for a long time, and the shape is not lost. . When the winding step is completed, the air is exhausted and the leaf 10 is contracted as shown in FIG. Then, a slight gap c is formed between the inner peripheral surface Ti of the wound paper roll R and the outer tube 11, so that the paper roll R can be pulled out from the winding shaft 1. In this case, since the outer tube 11 has a good slidability, it is easy to pull out the paper roll R and the shape of the paper roll R does not collapse.

FIG. 1 shows a coreless large-diameter paper roll R of the present invention obtained by the above manufacturing method. As shown in the figure, this coreless large-diameter paper roll R does not use a paper tube, and simply rolls up the roll paper b.
It is a roll-shaped roll. A hollow h is formed in the center of the winding body, and the winding initial layer around the winding h is firmly adhered with glue and has sufficient strength. A core rod can be inserted to support the roll.

[0026]

According to the manufacturing method of the present invention, it is possible to manufacture a coreless large-diameter paper roll which has been impossible in the past and which does not lose its shape for a long time. With the coreless paper roll of the present invention, the remaining roll of the residual paper after being used as the original roll can be reused as it is as a papermaking raw material, which is a great labor-saving effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a coreless large-diameter paper roll according to an embodiment of the present invention.

FIG. 2 is a detailed view of a winding part B in the paper winding machine.

FIG. 3 is an explanatory diagram showing an initial winding stage of a large diameter paper roll.

FIG. 4 is an explanatory diagram showing the end of winding of a large diameter paper roll.

FIG. 5 is a time / winding speed-related diagram in the production method of the present invention.

FIG. 6 is a time / winding speed-related diagram in the production method of the present invention.

FIG. 7 is a time / winding speed-related diagram in the production method of the present invention.

FIG. 8 is a perspective view of a winding shaft according to an embodiment of the present invention.

FIG. 9 is an enlarged sectional view of the winding shaft 1.

FIG. 10 is a sectional view showing the winding shaft 1 during a winding operation.

FIG. 11 is a cross-sectional view showing the winding shaft 1 during the work of removing the paper roll.

FIG. 12 is an explanatory diagram of a typical paper roll winding machine.

FIG. 13 is a perspective view (a) of a paper roll with a paper tube and an explanatory diagram of a work of cutting off a residual paper Pa by a conventional manufacturing method.

[Explanation of symbols]

R Large diameter paper roll W Web A
Paper feed processing part B Winding part 1 Reel shaft 9
Injection nozzle 10 Leaf 11 Exterior tube

Claims (2)

[Claims] 1. A paper feed processing part for feeding a web from a winding roll after paper making, performing paper processing if necessary and supplying the web to a winding part, and a web for winding the web on a winding shaft to form a core. None comprising a winding part for producing a paper roll, wherein the winding shaft is provided with several rows of radial lugs provided in the winding cylinder and a section which is individually fixed to the tops of the angular rows of lugs. A wide arc-shaped shape that extends in the axial direction .
Using a paper winder consisting of a plurality of leafs that are plate-shaped members and an outer tube that covers the plurality of leaves and that has elasticity and good slipperiness, use a web winding machine at the beginning of the winding process. Water-soluble glue is applied to the web, and the web is continuously wound onto the winding shaft without applying the glue after the mid-winding period, and the take-up speed of the take-up part at the beginning of winding and the end of winding. Take up the paper at a speed faster than the paper feed speed of the paper feed processing part,
A method for producing a coreless large-diameter paper roll, which comprises forming a paper roll, shrinking the leaf after the winding process, and pulling the paper roll out of the winding shaft. 2. A winding body which is wound in a roll shape only with a web, wherein an initial winding layer of the winding layer is tightly wound up,
2. A hollow core obtained by the method according to claim 1, wherein a hollow core is formed only by the web, and a softly wound-up winding layer is formed on the outer layer of the hollow core, and finished into a paper roll. Large diameter paper roll.