JP2017197343A - Method for manufacturing nonwoven fabric roll and nonwoven fabric roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a nonwoven fabric roll in which a thickness of a nonwoven fabric after dragging out is thick and a nonwoven fabric roll has a preferable shape without changing a wound diameter and a wound length of the nonwoven fabric roll, and to provide a nonwoven fabric roll.SOLUTION: A method for manufacturing a nonwoven fabric roll winds a nonwoven fabric 11 around a winding shaft 31 so as to control a stretch rate in a transportation direction of the nonwoven fabric 11 to be 7.6% or less when the winding shaft 31 winds the nonwoven fabric 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a nonwoven fabric roll and a nonwoven fabric roll.

  The nonwoven fabric used for the surface material of sanitary products in recent years is required to be “thick”. In order to satisfy this requirement, when the nonwoven fabric is slit to a predetermined width and wound on a roll, it is considered that the nonwoven fabric is wound loosely and the thickness is not crushed.

Patent Document 1 describes an elongated three-dimensional network sheet having a three-dimensional network structure in which fibers are integrated and bonded and wound in a roll shape in a compressed state in the thickness direction. Yes.
Patent Document 2 describes a method for producing a bulky nonwoven fabric in which the contact between fibers is heat-treated at a temperature between the heat deformation temperature of a low-melting thermoplastic resin and the melting point of a high-melting thermoplastic resin.
Furthermore, in Patent Document 3, a roll-shaped cloth foil that is not tensioned in the longitudinal direction of the cloth foil and is compressed in the thickness direction is wound using a belt. A winding method is described.

JP 2006-128981 A JP 2009-148912 A JP 2012-144835 A

There is a demand for nonwoven fabric rolls to increase the thickness of the nonwoven fabric when unrolled while ensuring a certain winding diameter and winding length. For that purpose, when a nonwoven fabric is wound into a nonwoven fabric roll, it is necessary to wind the nonwoven fabric loosely. However, if the non-woven fabric is wound loosely, the roll diameter of the non-woven fabric roll increases, making it difficult to transport. In addition, the nonwoven fabric roll cannot be attached to the unwinding device of the sanitary product manufacturing apparatus. On the other hand, if the winding length is shortened in order to reduce the winding diameter of the nonwoven fabric roll, the number of products that can be produced from one nonwoven fabric roll is reduced, and the productivity is lowered. In order to maintain productivity, the nonwoven fabric roll is frequently replaced. However, frequent replacement of non-woven rolls is not practical due to the heavy workload.
Further, the non-woven fabric is subjected to slit processing before being wound on a roll in order to obtain a predetermined width. When the nonwoven fabric is wound after the slit processing, the nonwoven fabric is stretched at a certain ratio (the stretching ratio is called a draw ratio). When this draw ratio is reduced and the nonwoven fabric is wound, the width of the nonwoven fabric after winding on the winding shaft may be wider than the width of the nonwoven fabric at the time of slitting. The slit process is a process in which a wide nonwoven fabric is cut in the longitudinal direction, divided into a plurality of nonwoven fabrics, and each nonwoven fabric is wound around a winding shaft. For this reason, the adjacent nonwoven fabric roll by which the nonwoven fabric was each wound up will be in the state which mutually contacted. That is, when the nonwoven fabric width becomes wider than the width immediately after the slit, adjacent nonwoven fabric rolls are pressed against each other, resulting in a defective shape. The reason why the width of the non-woven fabric wound up on the take-up shaft is increased is that the non-woven fabric is crushed and expanded by the pressure during winding.

As described in Patent Document 1, when a sheet is compressed in the thickness direction and wound on a roll, the sheet width after winding may be wider than the sheet width before winding. In particular, in the case of a nonwoven fabric, the sheet width after winding tends to be wide. Therefore, when the slit process is performed before winding and the nonwoven fabric is wound adjacently after the slit process, the nonwoven fabric roll has a shape defect as described above.
Moreover, in patent document 2, the heat processing for recovering bulkiness is needed, and the load of a process becomes large. It is required to obtain a bulky nonwoven fabric roll without using heat treatment.
Further, in Patent Document 3, since the tension is not applied in the longitudinal direction of the cloth, and it is compressed in the thickness direction, it is the same as in Patent Document 1. That is, the wound nonwoven fabric roll becomes defective in shape.

  The present invention relates to a method for producing a nonwoven fabric roll and a nonwoven fabric roll having a good nonwoven fabric roll shape in which the nonwoven fabric after unwinding is thick and the nonwoven fabric roll shape is good without changing the winding diameter and the winding length of the nonwoven fabric roll.

This invention provides the manufacturing method of the nonwoven fabric roll which makes the elongation rate of the conveyance direction of this nonwoven fabric the winding direction at the time of winding a nonwoven fabric on a winding shaft below 7.6%, and winds the said nonwoven fabric on the said winding shaft.
Moreover, the present invention is a nonwoven fabric roll in which a nonwoven fabric is wound on a winding shaft, and the width of the nonwoven fabric after being wound from the nonwoven fabric roll is the width of the nonwoven fabric wound on the winding shaft. On the other hand, the nonwoven fabric roll which is 102% or less is provided.

According to the method for producing a nonwoven fabric roll of the present invention, it is possible to obtain a nonwoven fabric roll having a good roll shape with a thick nonwoven fabric after unwinding without changing the winding diameter and winding length of the nonwoven fabric.
According to the nonwoven fabric roll of the present invention, it is possible to obtain a roll having a good roll shape with a thick nonwoven fabric after unwinding without changing the winding diameter and winding length of the nonwoven fabric.

It is the block diagram which showed typically one preferable embodiment of the manufacturing apparatus of the nonwoven fabric roll which enforces the manufacturing method of the nonwoven fabric roll which concerns on this invention. It is the graph which showed the relationship between the thickness of the unwound nonwoven fabric, and the compressibility of a nonwoven fabric. It is the graph which showed the relationship between the compression rate of a nonwoven fabric, and the expansion rate of a nonwoven fabric. It is the graph which showed the relationship between roll winding deviation | shift amount and the ratio of the nonwoven fabric thickness just before a slit / nonwoven fabric thickness at the time of roll winding.

A preferred embodiment (first embodiment) of the method for producing a nonwoven fabric roll according to the present invention will be described with reference to the nonwoven fabric roll production apparatus shown in FIG.
As shown in FIG. 1, the nonwoven fabric 11 is unwound from the raw fabric roll 10 arranged to be unwound on the nonwoven fabric roll manufacturing apparatus 1. The unwound nonwoven fabric 11 is tensioned to the nonwoven fabric 11 by a dancer roller 14 disposed between the guide rollers 12 and 13, and the tension in the transport direction (MD) is adjusted. The dancer roller 14 is provided with a pressing portion 15 that adjusts the pressure of the dancer roller 14 applied to the nonwoven fabric 11. Thereby, a desired tension is applied to the nonwoven fabric 11. For example, a pneumatic cylinder is used for the pressing portion 15.

The nonwoven fabric 11 is conveyed so as to be pulled in the conveying direction by the driving roller 16. The drive roller 16 is arranged to be rotated by a rotation drive device (not shown). A guide roller 17 is disposed at a position facing the drive roller 16. The nonwoven fabric 11 is sent out in the transport direction by a driving roller 16 and guided in the direction of the cutting blade 18 by a guide roller 17. The cutting blade 18 may be a rotary blade or a blade such as a knife.
A receiving roller 19 is disposed at a position facing the cutting blade 18. The nonwoven fabric 11 is cut in the longitudinal direction by a plurality of cutting blades 18 in the width direction while being pressed by the receiving roller 19. Therefore, the number of cutting blades 18 that is one less than the number of cuts of the nonwoven fabric 11 is arranged in accordance with the cutting interval of the nonwoven fabric 11.

  It is preferable that a pair of pressure rollers 21 and 22 for compressing the nonwoven fabric 11 to be slit is disposed immediately before the cutting blade 18 and the receiving roller 19 in the conveying direction of the nonwoven fabric 11. The pair of pressure rollers 21 and 22 will be described later.

The guide rollers 23, 24, and 25 guide the slit nonwoven fabric 11 to the first surface roller 26. Hereinafter, the slit nonwoven fabric 11 is also simply referred to as the nonwoven fabric 11.
The first surface roller 26 extends the slit nonwoven fabric 11 while pressing it against the take-up shaft 31. And the nonwoven fabric 11 by which the winding shaft 31 was slit is wound up. At that time, the nonwoven fabric 11 is further pressed against the winding shaft 31 by the second surface roller 27. The circumferential speed of the winding shaft 31 and the circumferential speed of the first surface roller 26 when the nonwoven fabric 11 is wound on the winding shaft 31 are the same. Moreover, these peripheral speeds are equivalent to the reference conveyance speed of the nonwoven fabric 11. The case where the peripheral speeds are equal includes not only the case where the peripheral speeds are completely the same, but also the case where one of the rollers is slightly slow or slightly fast. Further, the peripheral speed of the second surface roller 27 is the same as or slightly faster than the peripheral speed of the first surface roller 26. When the peripheral speed of the second surface roller 27 and the peripheral speed of the first surface roller 26 are the same, the second surface roller 27 guides the nonwoven fabric 11 to be wound around the surface of the nonwoven fabric 11 wound around the winding shaft 31. Have a role to play. When the peripheral speed of the second surface roller 27 is higher than the peripheral speed of the first surface roller 26, the second surface roller 27 plays a role of guiding the nonwoven fabric 11 described above. At the same time, as with the press roll 28, it has an effect of reducing the roll winding radius.

  And the nonwoven fabric 11 is crushed by the press roller 28 in the state wound by the winding shaft 31, and the winding diameter of the nonwoven fabric 11 to the winding shaft 31 is adjusted. The press roller 28 is provided with a pressing portion 29, and the pressing portion 29 adjusts the pressure of the press roller 14 applied to the nonwoven fabric 11 wound around the winding shaft 31. For example, a pneumatic cylinder is used for the pressing portion 29. Thus, the press roller 28 presses the nonwoven fabric 11 wound around the winding shaft 31. By the press roller 28, the winding diameter of the nonwoven fabric 11 wound around the winding shaft 31 can be reduced and wound firmly. That is, the non-woven fabric 11 wound around the take-up shaft 31 is pressed against the non-woven fabric 11 placed on the first surface roller 26 and the second surface roller 27 by the pressing force of the press roller 28. As a result, the nonwoven fabric 11 to be wound is pressed against the nonwoven fabric 11 wound around the take-up shaft 31 by pressing due to the reaction force of the first surface roller 26 and the second surface roller 27. Therefore, the winding diameter of the nonwoven fabric 11 wound around the take-up shaft 31 is controlled by the pressing force of the press roller 28 that generates a pressing force due to the reaction force from the first surface roller 26 and the second surface roller 27. In this way, the nonwoven fabric 11 is wound around the take-up shaft 31, and the nonwoven fabric roll 41 is completed.

When the nonwoven fabric 11 is wound around the winding shaft 31, the winding diameter and mass of the nonwoven fabric roll 41 increase. The nonwoven fabric roll 41 is placed on the first surface roller 26 and the second surface roller 27. For this reason, if the winding diameter and mass of the nonwoven fabric roll 41 increase, the force which presses the nonwoven fabric roll 41 against the 1st surface roller 26 and the 2nd surface roller 27 will become large. Originally, crushing of the nonwoven fabric 11 when the nonwoven fabric 11 is wound around the winding shaft 31 is controlled by the pressing force of the press roll 28. However, since the self-weight of the nonwoven fabric roll 41 is added to the pressing force to the nonwoven fabric 11 with the increase in the winding diameter of the nonwoven fabric roll 41, it falls outside the control range. Therefore, in order to be able to control with the pressing force of the press roll 28, the take-up shaft 31 is provided with a self-weight canceling portion 33 that cancels the self-weight of the nonwoven fabric roll 41. The self-weight canceling unit 33 pushes up with a force capable of supporting the mass of the nonwoven fabric roll 41 so as to lift the winding shaft (not shown) of the winding shaft 31 upward from the lower side. The self-weight canceling unit 33 can prevent a force other than the pressing force of the press roll 28 from being applied as a force for crushing the nonwoven fabric 11.
The self-weight canceling unit 33 calculates the mass by multiplying the basis weight (mass per unit area) of the nonwoven fabric 11 by the width and the winding length of the nonwoven fabric 11, and the force that supports the mass is the rotational axis of the winding shaft 31. It works to push up from below.
In the drawings, the arrows shown around the raw fabric roll 10 and the nonwoven fabric roll 41 indicate the respective rotation directions.

  The specific method for controlling the winding diameter of the nonwoven fabric roll 41 is “elongation of the nonwoven fabric in the conveyance direction of the nonwoven fabric (hereinafter also referred to as MD direction)” until the nonwoven fabric 11 is unwound and the winding shaft 31. Control is performed by two of the above-mentioned “pressing pressure to the nonwoven fabric” by the press roller 28. In the case of the above manufacturing method, since “elongation of the nonwoven fabric in the conveying direction” is limited, the press pressure by the press roller 28 is adjusted based on the winding diameter. For this reason, when “the elongation of the nonwoven fabric in the conveying direction” is determined, the “pressing pressure” is uniquely determined from the winding diameter.

“Elongation of the nonwoven fabric in the conveying direction” is defined as follows. That is, the difference between the length of the nonwoven fabric in the free tension state and the length of the nonwoven fabric at the moment of contact with the take-up shaft 31, and the difference obtained by dividing this difference by the original length is the elongation rate of the nonwoven fabric in the conveying direction. To do. Specifically, it was calculated as follows.
(A) The conveyance section of the nonwoven fabric 11 from the unwinding of the raw fabric roll 10 until the nonwoven fabric 11 comes into contact with the nonwoven fabric 11 wound on the winding shaft 31 was divided into a draw control section and a tension control section. In the illustrated example, the tension control section is from the winding of the nonwoven fabric 11 of the raw fabric roll 10 to the drive roller 16, and the section from the drive roller 16 to the nonwoven fabric 11 of the nonwoven fabric roll 41 is the draw control section.
(B) “Elongation of nonwoven fabric in conveyance direction” was determined from the tension value from the rearmost section in the tension control section. The rearmost section here refers to a section between the dancer roller 14 and the driving roller 16.
First, a tension and an elongation curve in the transport direction of the nonwoven fabric 11 were obtained using a tensile compression tester (for example, Tensilon Universal Material Tester manufactured by A & D Co., Ltd.). At the same time, the tension value of this section was obtained from the set value of the equipment. The elongation of this section was read based on the tension versus elongation curve and the tension set value.
(C) “Elongation of nonwoven fabric in conveyance direction” by draw control after the above section was obtained (from the set value of the manufacturing apparatus).
(D) The value obtained by integrating the values of (b) and (c) is “elongation of the nonwoven fabric in the conveying direction”.

  When the nonwoven fabric roll 41 is manufactured by the method of manufacturing the nonwoven fabric roll, the nonwoven fabric 11 is wound around the winding shaft 31 with an elongation percentage in the transport direction of the nonwoven fabric 11 transported toward the winding shaft 31 being 7.6% or less. take. Hereinafter, the elongation percentage in the conveyance direction of the nonwoven fabric 11 is also referred to as a draw ratio. Since the nonwoven fabric 11 is tensioned in the conveyance direction during conveyance, the nonwoven fabric 11 extends in the conveyance direction. The elongation rate in the conveyance direction is a ratio of the length of the nonwoven fabric stretched by tension in the conveyance direction with respect to the nonwoven fabric in a state where no tension is applied.

Next, the elongation in the conveyance direction of the nonwoven fabric will be described based on the results measured by the inventors.
The nonwoven fabric 11 was wound up by two methods: a method of winding the nonwoven fabric 11 by “compressing only” and winding the nonwoven fabric by “only stretching”. A nonwoven fabric roll having a thin nonwoven fabric was prepared and stored for 96 hours. Thereafter, the nonwoven fabric 11 was unwound from the nonwoven fabric roll 41 and released from the “compressed” state and the “stretched” state to make the nonwoven fabric 11 free. Then, the thickness of the nonwoven fabric 11 in a free state was measured. The thickness was measured as follows.

[Measurement method of nonwoven fabric thickness]
The method for measuring the thickness of the nonwoven fabric was measured using a thickness measuring instrument in a state where a load of 0.5 g / cm ² was applied to the nonwoven fabric. A laser displacement meter manufactured by OMRON Corporation was used as the thickness measuring instrument. This laser displacement meter was attached so as to display the position in the height direction of the object under it. A horizontal base was placed underneath, and a metal disk was placed on the horizontal base. The difference between when the non-woven fabric was present between the disk and the horizontal base and when there was no non-woven fabric was taken as the measured thickness of the non-woven fabric. At this time, the value obtained by dividing the mass of the disk by the area is 0.5 g / cm ² . The thickness was measured at six points, and the average value was calculated as the thickness.

A specific test method will be described below.
The test method is
(1) A nonwoven fabric loaded with a tensile force was fixed to a flat plate with a tape or the like while being stretched in one direction so as to have a constant elongation rate.
(2) The thickness of the above-mentioned fixed nonwoven fabric was measured using the above-mentioned “method for measuring the thickness of the nonwoven fabric”.
(3) The pressure at which the nonwoven fabric reaches the thickness measured by the above thickness measurement was determined with a KES compression tester (KES FB-3, manufactured by Kato Tech Co., Ltd.).
(4) The nonwoven fabric sample was pressurized with the pressure value obtained with the KES compression tester.
(5) The nonwoven fabric obtained in (1) above was stored in a stretched state. And the nonwoven fabric obtained in (4) was stored in a pressurized state. Storage was performed at room temperature (for example, 25 ° C.) for 4 days (96 hours).
(6) After the above storage period, the stretched nonwoven fabric was released from the tensile state. Moreover, the pressurized nonwoven fabric was released from the pressurized state. And the thickness of each nonwoven fabric was measured with the said "measuring method of nonwoven fabric thickness".

The result is shown in FIG. In FIG. 2, the vertical axis indicates the thickness of the unwoven fabric, and the horizontal axis indicates the compressibility of the nonwoven fabric. The compressibility of the nonwoven fabric means a ratio when the “thickness of the fixed nonwoven fabric” in the above (2) is divided by the “thickness of the nonwoven fabric before being stretched in one direction” in the above (1). .
As shown in FIG. 2, it was found that the thickness of the nonwoven fabric after compression becomes thicker than the thickness of the nonwoven fabric after stretching in a range where the compression rate is low with the compression rate x = 0.1928 as a boundary. The value of the compressibility is a correlation curve between the thickness and the compressibility of the nonwoven fabric in which the tensile force is released from the tension only state, and a correlation curve between the thickness and the compressibility of the nonwoven fabric in which the compressive force is released from the state of compression alone. Obtained from intersection.
FIG. 3 shows the correlation between the compression rate of the nonwoven fabric and the elongation rate (stretching rate) of the nonwoven fabric in the conveying direction. When the compression ratio was 0.1928, the elongation percentage of the nonwoven fabric was 7.60%. Therefore, if the elongation rate of the nonwoven fabric with a compression rate of 0.1928 or less is 7.60% or less, the nonwoven fabric roll 41 is thicker after unwinding without changing the winding diameter and winding length of the nonwoven fabric roll 41. 41 can be obtained.

  According to the manufacturing method of the said nonwoven fabric roll, it was favorable without changing the winding diameter of the nonwoven fabric 11, and the winding length, and the winding shape of the nonwoven fabric 11 of the nonwoven fabric roll 41 by which the nonwoven fabric was wound up did not collapse. Moreover, the nonwoven fabric roll 41 with the thick thickness of the nonwoven fabric 11 after unwinding was able to be obtained.

The pair of pressure rollers 21 and 22 shown in FIG. 1 rotate at a peripheral speed that is the same as the conveying speed of the nonwoven fabric 11. The nonwoven fabric 11 is sandwiched between the pressure rollers 21 and 22, for example, 1 kg. It compresses with the linear pressure of / cm to 400 kg / cm. Thereby, the nonwoven fabric 11 is compressed in the thickness direction. It is preferable to compress the thickness of the nonwoven fabric 11 immediately before the slit processing to 900% or less with respect to the thickness of the nonwoven fabric in the wound roll. Therefore, the pressing force of the pressure rollers 21 and 22 is adjusted according to the compression rate. Specifically, the applied pressure is adjusted while observing the winding state of the nonwoven fabric roll, that is, whether the winding collapses or does not collapse. If the winding collapses, it is determined that compression is insufficient and the pressure is increased. If the winding is in a clean state, it is judged that the compression is sufficiently performed and the pressure is maintained.
As shown in FIG. 4, the thickness of the nonwoven fabric 11 immediately before the slit processing is compressed to 900% or less in the thickness direction with respect to the thickness of the nonwoven fabric 11 after being wound around the winding shaft 31. Thereby, the roll winding deviation | shift amount of the nonwoven fabric 11 after being wound up by the winding shaft 31 can be 10 mm or less. On the other hand, when it is compressed to exceed 900%, the roll winding deviation amount becomes larger than 10 mm, and the nonwoven fabric 11 tends to collapse.

The slit-processed nonwoven fabric 11 is conveyed to the first surface roll 26 with the same width, and is wound around the take-up shaft 31 in a roll shape. When the nonwoven fabric 11 moves in the order of the first surface roll 26, the second surface roll 27, and the press roll 28, the nonwoven fabric 11 is crushed in the thickness direction and expanded in the width direction accordingly. The size of the spread in the width direction is large due to compression when winding in a roll shape, and becomes larger as the draw ratio is smaller. Since the slit nonwoven fabric 11 is in contact with each other, the adjacent nonwoven fabric rolls are pressed against each other when the spread in the width direction is increased. As a result, the rolls at both ends are unrolled. Become.
Note that “immediately before slitting” is not limited to the illustrated position regarding compression by the pressure rollers 21 and 22. It may be closer to the original roll 10 than the illustrated position, and in some cases, the original roll 10 may be compressed. Usually, since the nonwoven fabric 11 is cut by a slitter at a high speed of about 300 m / min, for example, even if the raw fabric roll 10 is taken as the starting point, the time to the slit is less than 1 second and the previous requirement is satisfied. .
Thus, by compressing the nonwoven fabric 11 before slitting, the nonwoven fabric 11 wound around the winding shaft 31 is displaced, so that the so-called roll collapse can be prevented.

Next, the nonwoven fabric roll 41 of this invention is demonstrated. The nonwoven fabric roll 41 is obtained by winding the nonwoven fabric 11 on a winding shaft 31. The width of the nonwoven fabric 11 after being unwound from the nonwoven fabric roll 41 is 105% or less with respect to the width of the nonwoven fabric 11 wound around the winding shaft 31.
According to the said nonwoven fabric roll 41, the roll diameter and winding length of the nonwoven fabric 11 are not changed, the thickness of the nonwoven fabric 11 after unwinding is thick, and the roll shape with no roll collapse can be obtained.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples in which a nonwoven fabric roll was produced by the above-described nonwoven fabric roll production method. The present invention is not limited to these examples.

Example 1
As the nonwoven fabric of Example 1, a two-layered nonwoven fabric was produced.
As a constituent fiber of the first layer nonwoven fabric, a concentric core-sheath type heat-extensible composite fiber whose core part is polypropylene having a melting point of 165 ° C. and whose sheath part is polyethylene (PE) having a melting point of 127 ° C. is used. It was. The nonwoven fabric of the first layer was obtained by using 50% of the core-sheath type heat-extensible conjugate fiber having the above-described configuration.
As a constituent fiber of the nonwoven fabric of the second layer, a core-sheath type heat-stretchable composite fiber of polyethylene terephthalate having a melting point of 255 ° C. for the core and polyethylene (PE) having a melting point of 130 ° C. for the sheath is used. Using. The non-woven fabric of the second layer was obtained by using 50% of the core-sheath type heat-extensible conjugate fiber having the above-described configuration.
Then, the web composed of the second layer nonwoven fabric is overlaid on the web composed of the first layer nonwoven fabric, embossed, and then subjected to a fusion treatment by an air-through (AT) method to form the nonwoven fabric. Produced. Embossing was processed into a quilted pattern consisting of continuous lines. The fusing conditions were a temperature of 134 ° C., a wind speed of 0.5 m / s, a processing time of 4 seconds, and a processing speed of 85 m / s.
The basis weight of the nonwoven fabric was 25 g / m ² .
In Example 1, the elongation in the MD direction immediately before being wound around the winding shaft 31, that is, the draw ratio at the time of conveyance was controlled to be 2.70%. In addition, the pressure applied to the nonwoven fabric 11 wound around the winding shaft 31 by the press roller 28 was set to 113 kg / width. Furthermore, before winding of the nonwoven fabric 11, the slit process which cut | disconnects the width direction of the nonwoven fabric 11 in multiple longitudinal directions was performed. And the thickness of the nonwoven fabric 11 just before slit processing was compressed to 850% with respect to the thickness when the nonwoven fabric 11 slit-processed is wound up by the winding shaft 31. FIG. Thus, the nonwoven fabric roll 41 was produced.

(Example 2)
In Example 2, the elongation in the MD direction immediately before winding on the winding shaft 31, that is, the draw ratio during conveyance was controlled to be 6.00%. Further, the pressure applied to the nonwoven fabric 11 wound around the winding shaft 31 by the press roller 28 was set to 44 kg / width. Otherwise, the nonwoven fabric roll 41 was produced in the same manner as in Example 1.

(Comparative Example 1)
In Comparative Example 1, the pressure applied to the nonwoven fabric 11 wound around the winding shaft 31 by the press roller 28 was set to 180 kg / width. Further, the thickness of the nonwoven fabric 11 immediately before the slit processing was compressed to 940% with respect to the thickness when the nonwoven fabric 11 subjected to the slit processing was wound around the winding shaft 31. Otherwise, the nonwoven fabric roll 41 was produced in the same manner as in Example 1.
(Comparative Example 2)
In Comparative Example 2, the elongation in the MD direction immediately before winding on the winding shaft 31, that is, the draw ratio during conveyance was controlled to be 8.00%. Moreover, the pressure to the nonwoven fabric 11 wound around the winding shaft 31 by the press roller 28 was set to 2 kg / width. Otherwise, the nonwoven fabric roll 41 was produced in the same manner as in Example 1.

[Measurement method of draw ratio during conveyance]
The method for measuring the draw ratio at the time of conveyance is the same as the method for obtaining the elongation rate in the conveyance direction described above.

[Measurement method of winding deviation]
The “winding deviation amount” is defined as the maximum deviation amount in the width direction of the nonwoven fabric wound around the nonwoven fabric roll. The nonwoven fabric roll was placed on a horizontal table with the winding axis of the nonwoven fabric roll to be measured set in the vertical direction. And the straight ruler longer than a roll diameter was horizontally set | placed on the nonwoven fabric roll. The distance from the plane of the straight ruler on the side in contact with the nonwoven fabric roll to the nonwoven fabric wound around the nonwoven fabric roll in the vertical direction was measured with a ruler. The measured value was defined as the amount of winding deviation.

[Measurement and evaluation method of ratio of roll winding width of nonwoven fabric / unwinding width of nonwoven fabric]
The winding width of the nonwoven fabric roll was obtained by measuring the width of the outer peripheral portion of the nonwoven fabric roll with a ruler. The unwinding width of the nonwoven fabric was obtained by placing the nonwoven fabric unwound from the outer periphery of the nonwoven fabric roll in a free tension state and placing it on a horizontal table, and measuring the width with a ruler.

[Measurement method of nonwoven fabric thickness]
The measuring method of the nonwoven fabric thickness produced the test piece for thickness measurement using the nonwoven fabric unwound from the nonwoven fabric roll. The test piece was cut out in a size of 25 cm in the MD direction of the unwound nonwoven fabric and 20 cm in the width direction of the unwound nonwoven fabric, and three pieces were prepared. The test piece was measured using a thickness measuring instrument in a state where a load of 0.5 g / cm ² was applied. A laser displacement meter manufactured by OMRON Corporation was used as the thickness measuring instrument. Thickness measurement was carried out by measuring 2 points for each test piece, a total of 6 points, and calculating the average value thereof to obtain the thickness. In addition, the measurement was performed within 30 minutes to 35 minutes after unwinding the sample from the roll.

  As is clear from the results shown in Table 1, in Example 1 and Example 2, the amount of collapse was smaller than in Comparative Example 1, and the nonwoven fabric thickness was thicker than in Comparative Example 2. Thus, the coexistence of making the nonwoven fabric thickness after unwinding a nonwoven fabric roll and making it a nonwoven fabric roll with few collapses was able to be performed.

DESCRIPTION OF SYMBOLS 1 Nonwoven fabric roll manufacturing apparatus 10 Original fabric roll 11 Nonwoven fabric 12, 13 Guide roller 14 Dancer roller 15 Pressing portion 16 Drive roller 17, 23, 24, 25 Guide roller 18 Cutting blade 19 Receiving roller 21, 22 Pressure roller 26 First Surface roller 27 Second surface roller 28 Press roller 29 Press part 31 Winding shaft 33 Self-weight cancel part 41 Non-woven roll

Claims (4)

  The manufacturing method of the nonwoven fabric roll which makes the elongation rate of the conveyance direction of this nonwoven fabric the winding direction at the time of winding a nonwoven fabric on a winding shaft or less, and winds the said nonwoven fabric on the said winding shaft. Before the winding of the nonwoven fabric, comprising a step of performing slit processing to cut the width direction of the nonwoven fabric in the longitudinal direction over a plurality,
The manufacturing method of the nonwoven fabric roll of Claim 1 which compresses the thickness of the said nonwoven fabric just before the said slit process to 900% or less in the thickness direction with respect to the thickness of the nonwoven fabric wound up by the winding shaft.   The nonwoven fabric is compressed in the thickness direction by sandwiching the nonwoven fabric between a pair of pressure rollers rotating at a peripheral speed that is the same as the conveyance speed of the nonwoven fabric while the nonwoven fabric is being conveyed just before the slit processing. Or the manufacturing method of the nonwoven fabric roll of 2. A nonwoven fabric roll in which a nonwoven fabric is wound around a winding shaft,
The nonwoven fabric roll whose width of the nonwoven fabric after being unwound from the nonwoven fabric roll is 105% or less with respect to the width of the nonwoven fabric wound around the winding shaft.

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