WO2014087902A1 - Method for producing laminated fiber body - Google Patents

Abstract

Provided is a method for producing a laminated fiber body in which pulp fiber acquired by defibrating, using a defibrator, a pulp sheet drawn from pulp stock is supplied to a stacking machine together with an air flow so as to acquire a laminated fiber body in which the pulp fiber has been deposited. In this method, when a second pulp sheet drawn from new pulp stock is to be supplied to the defibrator after a first pulp sheet supplied to the defibrator, the second pulp sheet is drawn at a conveying speed faster than the conveying speed of the first pulp sheet supplied to the defibrator, the conveying speed of the second pulp sheet is decelerated so that the tip of the second pulp sheet follows the end of the first pulp sheet, the tip of the second pulp sheet is set to be in a state of contacting or approaching the end of the first pulp sheet, and the second pulp sheet is supplied following the first pulp sheet.

Description

Method for producing piled body

The present invention relates to a method for manufacturing a laminated fiber body.

As a manufacturing method of absorbent articles for absorbent articles such as sanitary napkins, panty liners, disposable diapers, etc., the pulp fibers supplied along with the air flow in the duct are deposited with a pile machine, and the piled pile body is left as it is. Alternatively, a method is known in which the absorbent body is coated with paper or a breathable nonwoven fabric. The pulp fiber supplied to the stacking machine is obtained by defibrating a sheet (pulp sheet) from the original pulp with a defibrating machine. When the sheet supplied to the defibrator reaches the end, in order to continuously supply a new sheet to the sheet, the old and new sheets are stacked or abutted against each other.

It is known that when sheets are supplied to the defibrator in a state where they are overlapped, there is an excessive supply at the overlapping portion and the supply amount is not constant. In order to obtain a constant supply amount, as a method for supplying a sheet of pulp raw material to a defibrating machine, for example, Patent Document 1 discloses that a sheet is fed out from a sheet roll (pulp raw material) obtained by winding the sheet into a roll shape. A sheet feeding mechanism, a pulverizer that pulverizes the fed sheet into a fibrous material (defibrating machine), and a fibrous material fed from the defibrating machine to form a predetermined-shaped absorber. An apparatus for manufacturing an absorbent body having a textile machine is disclosed. This manufacturing apparatus has at least two sheet supply mechanisms, and when switching the sheet supply to the defibrator from one sheet supply mechanism to the other sheet supply mechanism, both of these sheets are supplied over a predetermined period. The supply mechanism supplies sheets to the defibrator, and the predetermined period includes a period during which one sheet supply mechanism decelerates the sheet feeding speed, and the other sheet supply mechanism performs sheet feeding according to the decelerating period. It is to accelerate the speed.

JP 2011-152351 A

The present invention provides a stacked fiber body in which a pulp sheet obtained by pulverizing a pulp sheet drawn from a pulp raw material with a defibrator is supplied to a stacker together with an air flow to obtain a stacked fiber body on which the pulp fibers are deposited. When the second pulp sheet drawn from the new pulp original fabric is supplied to the defibrator after the first pulp sheet supplied to the defibrator is supplied to the defibrator. The second pulp sheet is pulled out at a transport speed that is higher than the transport speed of the first pulp sheet, and the second pulp sheet is extended so that the front end of the second pulp sheet follows the end of the first pulp sheet. The conveyance speed is reduced so that the end of the second pulp sheet is in contact with or close to the end of the first pulp sheet, and the second pulp sheet is supplied following the first pulp sheet. To provide a method of manufacturing a 繊体.

The above and other features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings as appropriate.

It is a schematic block diagram including the partial cross section which showed an example of the manufacturing apparatus of the preferable fiber stack for implementing the manufacturing method of the fiber stack of this invention. It is the control block diagram which showed the control system until the pulp sheet pulled out from the pulp raw fabric is supplied to a defibrating machine. It is process drawing which showed one preferable embodiment of the manufacturing method of the fiber pile of this invention.

When supplying a pulp sheet drawn out from a pulp original fabric to a defibrating machine, when there is no pulp sheet supplied to the defibrating machine, a new pulp sheet is supplied following the pulp sheet. The present invention relates to solving the problems of overlapping of old and new sheets and excessive opening of old and new sheets.
A preferred embodiment of the method for manufacturing a laminated body according to the present invention will be described below with reference to FIGS. 1 and 2.
First, an apparatus for producing a laminated body suitable for carrying out the method for producing a laminated body will be described with reference to FIG.

As shown in FIG. 1, as a preferable example of the configuration of the stacking body manufacturing apparatus 10, a pulp unwinding machine 11, a pulp sheet transporting means 12, a defibrating machine 13, and a stacking machine 14 are arranged in this order. . In addition, pulp original fabric detection sensors 15 a and 15 b are arranged as a detection sensor 15 in the pulp raw fabric unwinding machine 11, and the sheet end distance between the pulp original fabric conveying means 12 (12 a and 12 b) and the defibrating machine 13. A detection device 16 is provided. Further, a pulp sheet detection sensor 15 (15c, 15d) is arranged as a detection sensor 15 between the pulp original fabric unwinding machine 11 and the pulp original fabric conveying means 12 (12a, 12b). Further, a pulp supply means 17 is arranged on the inlet side of the defibrating machine 13.

The pulp original fabric unwinding machine 11 is provided with two pulp original fabrics 1 (1a, 1b). The pulp original fabric 1 is obtained by winding a pulp sheet 2 in a roll shape. In the raw pulp unwinding machine 11, pulp original fabrics 1a and 1b (also referred to as first pulp original fabric 1a and second pulp original fabric 1b) are rotatably arranged. The pulp original fabric unwinding machine 11 has a pulp original fabric detection sensor 15 (15a, 15b) for detecting the diameter of the original fabric for each of the two pulp original fabrics 1a, 1b. A sheet cutter 18 (18a, 18b) is provided between the pulp original fabric 1 (1a, 1b) of the pulp original fabric unwinding machine 11 and the pulp sheet detection sensor 15 (15c, 15d). In the pulp unwinding machine 11, when the pulp sheet 2a is pulled out from the first pulp original 1a which is one pulp original, the drawing out of the second pulp original 1b which is the other pulp original is stopped. And is in a standby state. In this embodiment,
The thickness of the pulp sheet is, for example, 0.5mm or 2mm or less, the basis weight is 300 g / ^{m 2} or more 1500 g / ^{m 2} or less. Moreover, the mass of one new raw pulp before drawing is 100 kg or more and 1000 kg or less.
In addition, the pulp original fabric unwinding machine 11 may rotationally drive the pulp original fabric 1a, 1b with the drive device which is not shown in figure. Moreover, although two pulp original fabrics 1a and 1b are arranged, even if two pulp original fabric unwinding machines 11 are provided so that one pulp original fabric unwinding machine 11 becomes one pulp original fabric 1. Good.

The said pulp original fabric conveyance means 12 pulls out the pulp sheet 2 from the pulp original fabric unwinding machine 11, and guides it to the defibrating machine 13, and controls the conveyance speed of the pulp sheet 2. FIG. The pulp original fabric conveying means 12 includes a pair of opposed rolls 21 and 22, and at least one of the rolls, for example, the roll 21 is configured to be rotationally driven by a driving device (not shown). The rolls 21 and 22 are nip type rolls. The pulp original fabric conveying means 12 is arranged for each of the two pulp sheets 1 of the pulp sheet 2 (first pulp sheet 2a, second pulp sheet 2b), that is, two pulp original fabric conveying means 12 are provided. Is provided. The distance from the said sheet cutter 18 to the pulp supply means 17 is provided so that it may become the same with the 1st pulp sheet 2a and the 2nd pulp sheet 2b. For convenience, the pulp sheet 2 supplied to the defibrator 13 will be referred to as a first pulp sheet, and the pulp sheet 2 that is waiting or chasing the first pulp sheet will be described as a second pulp sheet. Further, the waiting pulp original fabric 2 is referred to as a second pulp original fabric or a new original fabric, and the pulp original fabric 1 supplying the first pulp sheet being defibrated to the first pulp original fabric or the old pulp original fabric Sometimes referred to as an original fabric.
An example of the drive device is a servo motor. From the viewpoint of preventing slip with the pulp sheet 2, it is preferable that both the rolls 21 and 22 are rotated by a driving device. In this case, the rolls 21 and 22 may be directly driven by a driving device, or one of the rolls may be driven by the driving device, and the driving may be transmitted to the other roll by a transmission means such as a gear. The conveying speed of the pulp sheet 2 by the pulp original fabric conveying means 12 is set to about one third or less of the production speed of the absorbent article, for example. The “production speed” here is a conveyance speed of a continuous absorbent article that is cut into individual absorbent articles.

The defibrating machine 13 defibrates the pulp sheet 2 to obtain the pulp fiber 3. For example, the casing 31, the rotary blade 32 that is disposed in the casing 31 and scratches the end of the pulp sheet 2, the opening 33 that takes in the pulp sheet 2 provided in the casing 31, and the opening that discharges the pulp fibers 3 Part 34 is provided. In addition, the pulp fiber 3 shown in FIG. 3 shows not the pulp fiber itself but the main scattering direction of the pulp fiber 3, and is shown by an arrow for convenience.

The fiber stacker 14 is obtained by supplying the pulp fibers 3 obtained by defibration with the fiber disintegrator 13 together with an air flow, and depositing the pulp fibers 3 to obtain a fiber stack 5 having a desired shape. is there. In addition, the pile fiber 5 may be obtained by supplying other materials used for the absorbent body such as the superabsorbent polymer particles together with the pulp fiber 3 into the duct 43 and depositing in the concave portion 41 for pile fiber.
For example, a rotating drum 42 in which a plurality of fiber-depositing concave portions 41 as deposition portions are formed on the outer peripheral surface at predetermined intervals, and a duct that supplies the pulp fibers 3 in a scattered state toward the outer peripheral surface of the rotating drum 42. 43 and a hood 44, and a covering mechanism (not shown) for covering the upper and lower surfaces of the fiber stack 5 released from the fiber stack recess 41 with the cover sheet 9. Details will be described below.

The rotating drum 42 has a cylindrical shape and is driven to rotate in the direction of arrow A in the drawing by a driving device (not shown) at a peripheral speed corresponding to the production speed of the production line of absorbent articles such as disposable diapers. .. Are formed on the outer peripheral surface of the rotary drum 42 in a shape corresponding to the shape of the fiber stack 5 to be manufactured. The fiber stack 5 stacked in the fiber stack concave portion 41 is used, for example, as an absorbent body for absorbent articles such as sanitary napkins and incontinence pads. Therefore, the shape of the fiber stacking concave portion 41 is determined according to the shape of the absorbent body. That is, the shape of the concave portion 41 for fiber accumulation is determined so that a convex portion or a concave portion in the thickness direction, a constricted shape in a plan view of the absorber, or the like is formed at a necessary portion of the absorbent body.

The rotary drum 42 is connected to an intake fan (not shown), and the partitioned space B in the rotary drum 42 is maintained at a negative pressure by the action of the intake fan. An air flow is generated in the duct 43 by the negative pressure in the space B, and the pulp fibers 3 from the defibrator 13 are in a scattered state. For this purpose, at least the bottom surface of each fiber stacking recess 41 is formed of a mesh plate or the like and has a large number of pores. While each of the concave portions 41 for stacking fibers passes through a space maintained at a negative pressure, the pores of the mesh plate function as suction holes. The space B is located behind the portion of the rotating drum 42 covered with the duct 43. The space B generates a strong suction force in the stacking concave portion 41 passing through the portion covered by the duct 43, thereby causing the pulp fibers 3 to be deposited in the stacking concave portion 41 or the air flow for transporting the pulp fibers 3. Is generated in the duct 43. The space C may be maintained at a negative pressure in order to convey the deposit or absorber while being stably held in the stacking concave portion 41. In this case, the space B has a negative pressure level higher than that of the space C. Highly maintained.

The duct 43 has one end portion 43 a connected to the hood 44 that covers a part of the outer peripheral surface of the rotating drum 42 and the other end portion 43 b connected to the defibrating machine 13, and is located on the space B. As described above, the air flow that flows toward the outer peripheral surface of the rotary drum 42 is generated in the duct 43 and the hood 44 by suction from the concave portion 41 for stacking fibers. The hood 44 may be formed integrally with the duct 43 as a part of the duct 43, or may be formed separately from the duct 43.

The pulp original fabric detection sensors 15a and 15b are sensors that detect whether the diameter of the pulp original fabric 1 is larger or smaller than a predetermined value. With this sensor, it is determined whether or not the remaining amount of the raw pulp 1 is sufficient. A material raw material is not limited to a pulp raw material, and usually has a structure in which a material is wound around a paper tube. As the remaining amount of material decreases with use, the raw fabric diameter also decreases. From the viewpoint of using pulp without waste and preventing detection errors, it is preferable to set a value obtained by adding about 5 mm to 10 mm to the diameter of the paper tube. There is no restriction | limiting in particular as pulp original fabric detection sensor 15a, 15b, A well-known detection method is used. For example, a sensor composed of a light emitting portion and a light receiving portion is disposed with the pulp original fabric 1 interposed therebetween, and the diameter of the pulp original fabric 1 is detected by shielding light from the pulp original fabric 1. In other words, by installing a sensor composed of a light emitting part and a light receiving part with an appropriate position and angle, when the pulp raw fabric diameter is larger than a predetermined value, light is shielded, and the pulp raw fabric diameter is smaller than a predetermined value. When this happens, the size of the diameter of the original pulp 1 can be detected because the light is not shielded. Alternatively, the diameter of the pulp original fabric 1 may be calculated by measuring the distance to the surface of the pulp original fabric 1 with a reflective distance sensor, and it may be determined whether the pulp original fabric diameter has reached a predetermined value.

The sheet cutters 18a and 18b have, for example, a blade incorporated in a roll pressed against the conveyance route of the pulp sheet 2, and the blade moves a groove on the roll surface in the axial direction of the roll by a moving means (not shown). This cuts the raw pulp 1. For example, a pressure cylinder is used as the moving means. Examples of the pressure cylinder include an air cylinder and a hydraulic cylinder.

The pulp sheet detection sensors 15c and 15d are sensors that detect the presence or absence of the pulp sheet 2. There is no restriction | limiting in particular as the pulp sheet detection sensors 15c and 15d, A well-known detection method is used. For example, the presence or absence of the pulp sheet 2 is detected by arranging a sensor composed of a light emitting portion and a light receiving portion with the pulp sheet 2 interposed therebetween and shielding the light with the pulp sheet 2. By detecting the presence or absence of the pulp sheet 2, it can be confirmed whether the pulp sheet 2 of the new pulp original fabric 1 is on standby, or the pulp sheet 2 has some cause even though the remaining amount of the pulp original fabric 1 is sufficient. Used to detect when disconnected at

The sheet edge portion distance detection device 16 includes an imaging device 61 and an illumination device 62 that illuminates the pulp sheet 2, and further includes an image processing device 63 that processes an image captured by the imaging device 61. The imaging device 61 is preferably a digital camera such as a CCD camera or a CMOS sensor camera. Examples of the illumination device 62 include an illumination device capable of continuous light emission for general photography. For example, a light emitting diode, a fluorescent lamp, etc. are mentioned. The image processing device 63 calculates an interval between the old and new pulp sheet end portions using the input imaging data. In addition, the old and new pulp sheet edge is automatically determined. It also follows the end of the pulp sheet, and outputs the distance between the old and new pulp sheet in real time. When the joint is not in the inspection range, a signal indicating “no end detection” is output. Further, the sheet edge portion distance detection device 16 can also detect the presence or absence of the pulp sheet 2. If no sheet is detected, it can be used as a trigger for stopping the line.

The pulp supply means 17 is a guide for smoothly supplying the pulp sheet 2 to the defibrating machine 13, and has the same configuration as the above-described pulp original fabric conveying means 12 as an example. That is, it has a pair of opposing rolls 71 and 72, and at least one of the rolls, for example, the roll 71, has a configuration that is rotated by a driving device (not shown). The rolls 71 and 72 are nip-type rolls. An example of the drive device is a servo motor. From the viewpoint of preventing slippage with the pulp sheet 2, it is preferable that both the roll 71 and the roll 72 are rotated by a driving device. In this case, the rolls 71 and 72 may be directly driven by a driving device, or one of the rolls may be driven by the driving device, and the driving may be transmitted to the other roll by a transmission means such as a gear. Further, from the viewpoint of further preventing slippage with the pulp sheet 2, the roll 71 and the roll 72 are formed with axial grooves on the entire surface thereof, and are not easily slipped.
This pulp supply means 17 is controlled separately from the control of causing the end 2bt of the second pulp sheet 2b to continue to the end of the first pulp sheet 2a, which will be described later, and the conveying speed of the pulp sheet 2 necessary for producing the pile 5 It is driven according to. A certain amount of the pulp sheet 2 is supplied to the defibrator 13 by the pulp supply means 17.

Furthermore, a guide roll, which is partly illustrated, is disposed on the transport path of each pulp sheet 2 as appropriate. Moreover, the distance from the sheet edge part distance detection apparatus 16 (the center position of the travel path of the pulp sheet in a detection apparatus) to the defibrating machine 13 is the new pulp sheet (the first pulp sheet 2a) at the end of the old pulp sheet (first pulp sheet 2a). From the viewpoint of controlling to catch up so as not to overtake the tip of the two pulp sheet 2b), for example, 100 mm to 1000 mm is preferable, and 500 mm to 1000 mm is more preferable. In order to finally enter the defibrator 13 after the new pulp sheet catches up with the old pulp sheet, a certain distance is required between the sheet edge distance detection device 16 and the defibrator 13. However, it is not necessary to have a very long distance. From this point of view, it is set as described above. However, in view of workability during maintenance and manual paper introduction, it is preferable to set a little longer in the above range.

Next, the control until the pulp sheet 2 drawn from the pulp original fabric 1 is supplied to the defibrating machine 13 in the production apparatus 10 of the above-described fiber stack will be described below with reference to FIG. In addition, in FIG. 1, the 1st pulp sheet 2a is supplied at the production rate, and the 2nd pulp sheet 2b has shown the state currently waiting by the pulp original fabric conveyance means 12b.

As shown in FIG. 2, the 1st pulp sheet 2a pulled out from the 1st pulp original fabric 1a is conveyed by the pulp original fabric conveyance means 12a in the direction of the fibrillator 13. In the control part 101, the signal S5 which instruct | indicates the conveyance speed of the 1st pulp sheet 2a by the pulp original fabric conveyance means 12a is sent to the drive device 23a of the pulp original fabric conveyance means 12a. Upon receiving the signal S5, the driving device 23a conveys the first pulp sheet 2a at the instructed speed. That is, the speed of the 1st pulp sheet 2a is controlled by the pulp original fabric conveyance means 12a. As the control unit 101, a programmable logic controller (PLC) is preferably used from the viewpoints of availability and economy and from the viewpoint of workability when changing settings.
At this time, the pulp original fabric detection sensor 15a always detects whether the diameter of the first pulp original fabric 1a is larger or smaller than a predetermined value.
On the other hand, as shown in FIG. 1, while the first pulp sheet 2a is being supplied to the defibrator 13, the leading end 2bt of the second pulp sheet 2b of the second pulp original fabric 1b is pulled out of the pulp original fabric conveying means 12b. Pull out to the side position and stop. In the present embodiment, the front end 2bt of the second pulp sheet 2b is stopped at a position where the pair of rolls 21 and 22 which are the pulp original fabric conveying means 12 are sandwiched. The tip 2bt of the second pulp sheet 2b may be manually set, or may be automatically performed by linking the pulp unwinding machine 11 and the pulp sheet conveying means 12b. The front end 2bt of the second pulp sheet 2b to be waited is set so as to be at a predetermined position every time. However, when setting manually, it is preferable to provide a mark at a position that is the front end position. In the case of automatic setting, the tip position is set to be constant.
The signals S1 and S2 obtained by the pulp original fabric detection sensors 15a and 15b are sent to the control unit 101.

When the remaining amount of the first pulp raw fabric 1a being supplied is reduced, and the signal S1 from the pulp raw fabric detection sensor 15 (15a) indicates that the diameter of the first pulp sheet 2a is cut, new pulp is obtained. The operation of switching to supply from the original fabric (so-called paper splicing) is started. That is, the signal S1 by the pulp original fabric detection sensor 15a that detects that the remaining amount of the first pulp original fabric 1a is equal to or less than the specified value is used as a pulp paper splicing operation start signal. The signal S1 may be switched to an ON / OFF signal when the diameter to be cut is reached and notified to the control unit 101, or the control unit 101 may determine based on the level of the signal.
The control unit 101 starts a paper splicing operation in response to the signal S1. First, a signal S3 for cutting the first pulp sheet 2a is sent to the sheet cutter 18a, and the sheet cutter 18a that receives the signal S3 cuts the first pulp sheet 2a. For example, it is cut linearly in a direction perpendicular to the transport direction.

Next, after a predetermined time has elapsed since the transmission of the signal S3, the control unit 101 transmits a signal S6 for driving the driving device 23b of the pulp original fabric conveying means 12b.

In the control unit 101, the signal S5 is continuously sent even after the first pulp sheet 2a is cut, and the pulp sheet paper splicing operation is continued. A signal S6 for instructing the driving speed of the second pulp sheet 2b to the driving device 23b of the pulp original fabric transporting means 12b after a certain period of time instructs a transport speed faster than the signal S5. For example, the initial value of the signal S6 is preferably 105% or more and 130% or less of the set speed of the signal S5. Thereafter, the conveyance speed instruction value transmitted as the signal S6 after a certain time has elapsed is decreased. That is, the conveyance speed of the 2nd pulp sheet 2b is decelerated. This speed change is performed at the end of the inspection region of the end-to-end distance detection device 16 when there is no conveyance delay of the second pulp sheet 2b due to slip or the like in the pulp original fabric conveyance means 12b at the start of conveyance. The end of the first pulp sheet 2a is issued at a timing at which the end of the second pulp sheet 2b catches up or approaches without overtaking. That is, the tip of the second pulp sheet 2b has not yet caught up to the end of the first pulp sheet 2a until it reaches the end of the end-to-end distance detection device 16, and is transported at a higher speed than the first pulp sheet 2a. ing. Since various conditions such as the standby position at the tip of the second pulp sheet 2b, the position of the pulp supply means 17, and the distance between them are known in advance, the conveyance speed of the first pulp sheet 2a, the timing of sending the signals S5 and S6, etc. It can be determined as appropriate.

In addition, the imaging device 61 captures the end of the first pulp sheet 2a that passes through the sheet edge distance detection device 16 and the tip of the second pulp sheet 2b that follows it, and the image processing device 63 processes the image. Thus, the distance between the end of the first pulp sheet 2a and the tip of the second pulp sheet 2b is calculated and sent to the control unit 101 as a signal S7.
There is no gap between the pulp sheets 2a and 2b (the distance between the end of the first pulp sheet 2a and the tip of the second pulp sheet 2b) (for example, slipping and not being sufficiently conveyed). If it is equal to the gap in the case, the deceleration of the second pulp sheet 2b as the predetermined setting is continued, and the gap between the pulp sheets 2a and 2b is minimized when the conveyance speed of the old and new pulp sheets 2 becomes equal. To.
If the gap between the pulp sheets 2a and 2b is larger than the gap when there is no conveyance mistake, the deceleration of the second pulp sheet 2b is temporarily suspended until the gap becomes the same as when there is no conveyance mistake, Resume deceleration as set. In this way, the catch-up position changes, but the gap can be minimized even if there is a conveyance mistake.
If the gap is so large that the new second pulp sheet 2b cannot catch up with the preceding first pulp sheet 2a at the conveyance speed at which the deceleration is interrupted, it is determined that the paper joining has failed and the line is stopped. The supply of the sheet 2a and the second pulp sheet 2b is stopped. Then, the preceding first pulp sheet 2 a which is an old pulp sheet is removed, and a new second pulp sheet 2 b is manually set between the pair of rolls 71 and 72 of the pulp supply means 17. The reason why such a method is adopted is that the new second pulp sheet 2b is accelerated because the possibility of slipping increases.

Next, the leading edge 2at of the first pulp sheet 2a of the first pulp original fabric 1a newly attached to a predetermined position of the pulp original fabric unwinding machine 11 (see FIG. 1) is sent out by the pulp original fabric conveying means 12a. Pull out to the side position and stop. The method for setting the tip 2at is the same as the method for setting the tip 2bt of the second pulp sheet 2b of the second pulp raw fabric 1b described above. Thereafter, although the first pulp original fabric 1a and the first pulp original fabric 1b are arranged in opposite positions, the respective steps are repeated in order as described above.
The control unit 101 continues to send the signal S5 after cutting the first pulp sheet 2a. However, when the image pickup device 61 detects the end of the first pulp sheet 2a, the control unit 101 stops the transmission or transmits a stop signal. To do. Thereby, the pulp original fabric conveyance means 12a of the 1st pulp sheet 2a stops.

As described above, the distance from the sheet cutter 18 to the pulp supply means 17 is the same between the first pulp sheet 2a and the second pulp sheet 2b. By doing in this way, the same setting can be used in the paper splicing operation from the first pulp original fabric 1a to the first pulp original fabric 1b and from the first pulp original fabric 1b to the first pulp original fabric 1a.

That is, when the pulp original fabric detection sensor 15b detects that the diameter of the second pulp original fabric 1b is a diameter that cuts the second pulp sheet 2b for paper joining, the signal S2 is transmitted to the control unit 101. Is done. The control unit 101 that has received the signal S2 sends a signal S4 for cutting the end of the second pulp sheet 2b to the sheet cutter 18b, and the sheet cutter 18b that has received the signal S4 cuts the second pulp sheet 2b. In this case as well, for example, it is cut linearly in a direction perpendicular to the feed direction. Next, the control unit 101 transmits a signal S5 for driving the driving device 23a of the pulp original fabric conveying means 12a after a predetermined time has elapsed from the transmission of the signal S4.

In the control unit 101, the signal S6 is continuously sent even after the second pulp sheet 2b is cut, and the pulp sheet paper splicing operation is continued. After a certain period of time, a signal S5 is sent to the driving device 23a of the pulp original fabric conveying means 12a to instruct the conveying speed of the first pulp sheet 2a. At this time, the signal S5 indicates a faster conveying speed than the signal S6. For example, the initial value of the signal S5 is preferably 105% to 130% of the set speed of the signal S6. Thereafter, the conveyance speed instruction value transmitted as the signal S5 after a certain time has elapsed is decreased. This speed change is performed at the end of the inspection region of the end-to-end distance detection device 16 when there is no conveyance delay of the first pulp sheet 2a due to slip or the like in the pulp original fabric conveyance means 12a at the start of conveyance. The end of the second pulp sheet 2b is issued at a timing at which the end of the first pulp sheet a catches up or approaches without overtaking. That is, the front end of the first pulp sheet 2a has not yet caught up with the end of the second pulp sheet 2b until it reaches the end of the end-to-end distance detection device 16, and is transported at a higher speed than the second pulp sheet 2b. Has been. Since various conditions such as the standby position of the sheet end, the position of the pulp supply means 17, and the distance between them are known in advance, the conveyance speed of the second pulp sheet 2b, the timing of sending the signals S6 and S5, etc. should be determined appropriately. Can do.

Similarly to the above, the end of the first pulp sheet 2a and the tip of the second pulp sheet 2b that follows it are photographed by the imaging device 61, the image is processed by the image processing device 63, and the end of the second pulp sheet 2b. And the distance between the first pulp sheet 2a and the leading end of the first pulp sheet 2a is sent to the control unit 101 as a signal S7. In the same manner as described above, the speed of the first pulp sheet 2a is adjusted so that the gap between the pulp sheets 2b and 2a (the distance between the terminal end of the second pulp sheet 2b and the tip of the first pulp sheet 2a) is minimized. Further, as described above, when it is determined that the paper joining has failed, the supply of the second pulp sheet 2b and the first pulp sheet 2a is stopped, the second pulp sheet 2b which is the old pulp sheet is removed, and a new first pulp sheet 2a is obtained. It is manually set between a pair of rolls 71 and 72 of the pulp supply means 17.

The control unit 101 sends a signal S8 to the pulp supply means 17 so that the pulp sheet 2 is conveyed to the pulp defibrator 13 at the conveying speed of the pulp sheet 2 necessary for the production of the pile 5. The pulp supply means 17 receives this signal S8, drives the drive device 73, and the rolls 71 and 72 shown in FIG. 1 rotate so that the pulp sheet 2 is sent in the direction of the pulp defibrator 13, and the pulp supply means 17 Operate. Thus, the pulp sheet 2 is supplied to the defibrator 13. The control by the signal S8 is independent of other controls related to the pulp paper splicing.

The defibrator 13 is provided with a drive device 35 for driving it. The operation of the defibrator 13 is controlled independently of other controls related to pulp paper joining. Therefore, the operation of the defibrator 13 is not linked with the paper splicing operation. Since the defibrator 13 takes time from the start to the stable rotation, it is not stopped when the production line is stopped for a short time, and is stopped when the production line is not moved for a long time (for example, cleaning or break).

Next, a preferred embodiment of a method for manufacturing a fiber stack using the fiber stack manufacturing apparatus 10 will be described below with reference to FIG.
As shown to Fig.3 (a), the said pulp original fabric unwinding machine 11 arrange | positions two pulp original fabrics, the 1st pulp original fabric 1a and the 2nd pulp original fabric 1b. Now, in the pulp unwinding machine 11, the first pulp sheet 1 a is drawn out via the pulp sheet conveying means 12, the pulp supplying means 17, and the like and supplied to the defibrating machine 13. In the meantime, the 2nd pulp original fabric 1b is arrange | positioned at the pulp original fabric unwinding machine 11, and it is set as a standby state. In detail, the 2nd pulp original fabric 1b is arrange | positioned in the predetermined position of the pulp original fabric unwinding machine 11, and the front-end | tip 2bt of a 2nd pulp sheet is pulled out to the pulp original fabric conveyance means 12 (12b). In addition, it is made for the front-end | tip 2bt of the 2nd pulp sheet 2b made to wait to become a predetermined position every time. The tip 2bt of the second pulp sheet is sandwiched between the rolls 21 and 22 as shown in FIG. 1 and held in a state where it is extended by a predetermined amount, and no further drawing operation is performed. In this state, the first pulp original fabric 1a and the second pulp original fabric 1b are detected by the pulp original fabric detection sensors 15a and 15b.

The tip 2bt of the second pulp sheet 2b is straight in the direction perpendicular to the transport direction when the end 2ae of the first pulp sheet 1a is cut linearly in the direction perpendicular to the transport direction. It is preferable that it is formed in a shape. The second pulp sheet catches up with the end 2ae of the first pulp sheet 1a because the end 2ae of the first pulp sheet 1a and the tip 2bt of the second pulp sheet 2b are linear in the direction perpendicular to the conveying direction. The tip 2bt of 2b is parallel to the end 2ae of the first pulp sheet 1a, and the tip 2bt of the second pulp sheet 2b does not overlap with the tip 2bt. Can do.
Moreover, before the 2nd pulp sheet 2b is set to the predetermined position of the pulp original fabric unwinding machine 11, it is preferable that the front-end | tip both sides are cut diagonally with respect to a conveyance direction. A pulp sheet generally has a high basis weight and high shape retention, but its tip, particularly both corners, tends to be turned up. If transported with the tip turned up, a clogging trouble may occur at the entrance of the defibrator 13, and therefore it is preferable to cut both sides of the tip obliquely with respect to the transport direction in order to prevent this. In order to ensure the meklet prevention effect by cutting while suppressing fluctuation of the supplied pulp amount by cutting the pulp sheet, for example, when the width of the pulp sheet is 200 mm or more and 1000 mm or less, for both sides of the tip, It is preferable to cut out isosceles triangles each having a side of about 30 mm from both sides. In addition, it is preferable to cut the width direction center of a pulp sheet at right angles to a conveyance direction.

Next, as shown in FIG. 3 (b), when it is detected by the pulp original fabric detection sensor 15a that the pulp original fabric 1a has a predetermined diameter, the first pulp sheet is cut by the sheet cutter 18a.
That is, the first pulp original fabric 1a and the second pulp are detected using the pulp original fabric detection sensors 15a and 15b that detect that the remaining amount of the first pulp original fabric 1a (see FIG. 3 (a)) is equal to or less than a specified level. Signals S1 and S2 indicating that the diameter of the raw fabric 1b has been cut are used as the start signals for the pulp paper splicing operation.

Next, as shown in FIG.3 (c), when supplying the 2nd pulp sheet 2b to the defibrator 13 after progress for a fixed time, conveyance faster than the conveyance speed of the 1st pulp sheet 2a currently supplied to the defibrator 13 The second pulp sheet 2b is pulled out at a speed so that the front end 2bt of the second pulp sheet 2b follows the end 2ae of the first pulp sheet 2a without overtaking it. And the conveyance speed of the 2nd pulp sheet 2b is decelerated. This speed change is performed at the end of the inspection area of the end-to-end distance detection device 16 when the transport delay of the second pulp sheet 2b in the pulp original fabric transport means 12b does not occur at the start of transport. 2a is performed at a timing when the end of the second pulp sheet 2b catches up or approaches the end of 2a without overtaking. In addition, since the standby position of the sheet end, the position of the pulp supply means 17, the distance therebetween, the conveyance speed of the first pulp sheet 2a, and the like are known in advance, the conveyance speed and the like can be set in advance. it can. For example, the initial value of the transport speed of the second pulp sheet 2b as a speed faster than the transport speed of the first pulp sheet 2a is preferably 105% to 130% of the set speed of the transport speed of the first pulp sheet 2a. In addition, each conveyance speed is suitably determined according to various conditions.
Moreover, if the terminal end distance detection apparatus 16 detects the terminal end of the 1st pulp sheet 2a, the pulp original fabric conveyance means 12a which pulls out the 1st pulp sheet 2a will be stopped.
Although not shown here, a new first pulp original fabric 1a may be attached to the pulp original fabric unwinding machine 11. The new first pulp original fabric 1a is attached before the end of the second pulp sheet 2b is detected as a predetermined diameter by the pulp original fabric detection sensor 15b.

Then, as shown in FIG. 3 (d), in the process of deceleration of the second pulp sheet 2b, the leading end 2bt of the second pulp sheet becomes the trailing end 2ae of the first pulp sheet without overtaking the trailing end 2ae of the first pulp sheet. It catches up and makes the conveyance speed of the 2nd pulp sheet 2b equivalent to the conveyance speed of the 1st pulp sheet 2a. At this time, the end 2bt of the second pulp sheet 2b is brought into contact with or close to the end 2ae of the first pulp sheet 2a. Here, “approaching” refers to a state in which the end 2bt of the second pulp sheet does not overlap the end 2ae of the first pulp sheet and is not separated more than a certain distance. Most preferably, the end 2bt of the second pulp sheet is in contact with the end 2ae of the first pulp sheet, and the end 2bt of the second pulp sheet is supplied to the defibrator 13 following the end 2ae of the first pulp sheet. State. The above-mentioned fixed interval is, for example, preferably 5 mm or less, more preferably 1 mm or less. If it is within the above-mentioned fixed interval, an almost constant amount can be supplied without causing a large change in the amount of pulp supplied to the defibrating machine 13, which affects the fiber setting in the fiber-sending machine 14 (see FIG. 1). There is no.

In the above-described process shown in FIG. 3 (d), at the stage of detecting the gap between the old and new pulp sheets 2a and 2b in the image processing in the sheet edge distance detection device 16, the conveyance speed of the new second pulp sheet 2b is Although it is decelerating, it still exceeds the conveying speed of the first pulp sheet 2a. If the gap between the pulp sheets 2a and 2b is equal to the gap in the case where there is no conveyance mistake (for example, when the sheet cannot be sufficiently conveyed due to slipping), the deceleration according to the predetermined setting is continued, When the conveying speed becomes equal, the gap between the pulp sheets 2a and 2b is minimized.
If the gap between the pulp sheets 2a and 2b is larger than the gap when there is no conveyance mistake, the deceleration is temporarily suspended until the gap becomes the same as when there is no conveyance mistake, and then the deceleration as set is resumed. To do. In this way, the catch-up position changes, but the gap can be minimized even if there is a conveyance mistake.
If the gap is so large that the new pulp sheet 2b cannot catch up with the preceding pulp sheet 2a at the conveyance speed at which the deceleration is interrupted, it is determined that the paper joining has failed and the line is stopped. In that case, the previous pulp sheet 2a which is an old pulp sheet is removed, and a new pulp sheet 2b is manually set. The reason for adopting such a method is that acceleration of the new pulp sheet 2b increases the possibility of slipping.

Subsequently, as shown in FIG. 3 (e), the leading end 2bt of the second pulp sheet 2b that has caught up with the terminal end 2ae of the first pulp sheet is the same as the conveying speed of the first pulp sheet 2a. Supplied to the fine machine 13.

Next, as shown in FIG. 3 (f), the leading end 2at of the first pulp sheet 2a of the first pulp original fabric 1a newly attached to a predetermined position of the pulp original fabric unwinding machine 11 is connected to the pulp original fabric conveying means. 12 (12a). Thereafter, the first pulp original fabric 1a and the first pulp original fabric 1b are different in that they are arranged in opposite positions, but the steps are sequentially performed in the same manner as described with reference to FIG. Repeated.

In the method for manufacturing the fiber stack, the end 2ae of the first pulp sheet and the front end 2bt of the new second pulp sheet are not spaced apart, and the end 2ae of the first pulp sheet and the front end 2bt of the second pulp sheet are Without overlapping, the second pulp sheet 2b can be supplied to the defibrator 13 with the end 2ae of the second pulp sheet continuing to the end 2ae of the first pulp sheet. Accordingly, the old and new pulp sheets are not supplied to the defibrating machine 13 in an overlapped state, and the sheet clogging in the pulp defibrating machine 13 that is likely to occur when a new pulp sheet is supplied can be suppressed. Further, since the new second pulp sheet 2b is supplied to the defibrator 13 without any gap between the old and new pulp sheets, the pulp sheet 2 can be supplied to the defibrator 13 at a constant amount per unit time. Therefore, since the pulp fiber 3 can be stably supplied from the defibrator 13 to the piler 14, the dispersion of the weight of the piled body 5 obtained by the piler 14 can be suppressed and the quality can be stabilized. In addition, since the manufacturing method of the present invention can be realized with a simple apparatus, the equipment cost can be reduced and the manufacturing cost can be reduced.

Further, by cutting the end portion (terminal 2ae) of the first pulp sheet 1a linearly in a direction perpendicular to the sheet conveying direction, the end 2bt of the second pulp sheet 2b is connected to the terminal 2ae of the first pulp sheet 1a. It becomes easy to contact without overlapping and without generating a gap.
Furthermore, the width direction both sides of the edge part (tip 2bt) of the second pulp sheet 2b are cut obliquely with respect to the sheet conveying direction, so that the second pulp sheet 2b can easily enter the defibrator 13 and the defibrator 13 Sheet clogging at the entrance of the sheet is suppressed.

An absorbent article can be manufactured using the fiber pile obtained by the method for producing a fiber pile as an absorbent body. The absorbent article is mainly used for absorbing and holding liquid discharged from the human body such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, panty liners (downcome sheets), incontinence pads, and the like, but are not limited to these, and are used to absorb liquid discharged from the human body. Widely encompasses articles. The absorbent article typically includes a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent body interposed between the two sheets. The absorbent article may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when the absorbent article is a disposable diaper, a sanitary napkin, or the like, a pair or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the topsheet.

The manufacturing method includes various methods. As an example thereof, a method for manufacturing a pants-type disposable diaper described in JP 2008-161514 A, JP 2004-136068 A, etc., JP 6-70958 A, JP 2000-126231 A, etc. The manufacturing method of the sanitary napkin described in the manufacturing method of the tape-type disposable diaper described, Unexamined-Japanese-Patent No. 2010-104545, Unexamined-Japanese-Patent No. 2010-131131, etc. can be used.

For example, the pulp fiber 3 obtained by the defibrator 13 as described above is deposited on the fiber pit 41 of the rotary drum 42 or the conveyor belt (not shown) in the fiber synthesizer 14 to form the fiber pile 5, The laminated body 5 is covered with a nonwoven fabric or paper to obtain an absorbent body. An absorber is divided | segmented into the length used for one absorbent article.
For sanitary napkins, this absorber is interposed between the liquid-permeable continuous sheet for the top sheet and the liquid-impermeable or water-repellent continuous sheet for the back sheet. And is formed by dividing into individual absorbent articles. If necessary, each member is fixed so that a three-dimensional gather is formed on the skin side of the top sheet and a wing is formed on the side of the absorbent article.

For pants diapers, the absorbent body before splitting is interposed between a continuous sheet for liquid-permeable top sheet and a continuous sheet for liquid-impermeable or water-repellent back sheet, and is used for one absorbent article. Divide into pieces to form an absorbent body. Next, an absorptive main body is fixed to the continuous sheet | seat for exterior sheets which comprises the belly side part and back | dorsal part of a pants diaper, and the exterior sheet is folded and joined in the width direction to form individual pant diapers. A waist gather is formed by fixing the thread-like elastic member in an extended state on the exterior sheet, but if necessary, an elastic member for the leg circumference or the waistline gather can be fixed, or a three-dimensional structure can be formed on the skin side of the top sheet. A gather may be formed.

The present invention is not limited to the above embodiment. For example, synthetic fibers may be mixed in the pulp sheet 2 and the synthetic fibers may be formed by the defibrator 13. Further, in addition to the pulp fiber 3 obtained by the defibrating machine 13, other fiber materials such as synthetic fiber may be supplied to the stacking machine 14 and deposited to form the stacked body 5.

In this embodiment, a sensor (15a, 15b) for monitoring the raw pulp diameter is provided, and detection of a small raw fabric diameter is used as a trigger to cut the pulp sheet 2 on the old pulp raw fabric 1 side, so that the paper splicing operation is performed. Instead, the pulp sheet detection sensors 15c and 15d that monitor the presence or absence of the pulp sheet 2 are used to detect the detection signals (S1 ′, S2 ′) of the pulp sheet 2 on the old pulp raw fabric 1 side. Triggered by switching to (that is, using up the pulp sheet 2 on the old pulp original fabric 1 side), and starting the pulp sheet conveyance on the new pulp original fabric 1 side (after a certain period of time) You may do it. Of course, the triggering of the detection of the pulp sheet 2 on the old pulp raw fabric 1 side switched from being present to nothing prevents the pulp sheet 2 on the old pulp raw fabric 1 side from being cut, thereby preventing the paper splicing operation. I can't. Moreover, it is good also considering the signal (S3, S4) which instruct | indicates the cut to the sheet cutter 18 (18a, 18b) which cut | disconnects the pulp sheet 2 as starting vibration of paper joining operation | movement.
In this embodiment, the distance from the pair of opposed rolls 21 and 22 of the pulp original fabric conveying means 12 to the sheet cutter 18 is the same distance between the first pulp sheet 2a and the second pulp sheet 2b. However, it may be different. If they are different, it is necessary to change the timing at which the new pulp raw fabric 1 starts moving in the splicing operation of the pulp sheet 2 between the first pulp sheet 2a and the second pulp sheet 2b. It is preferable to carry out with the same control method and timing except for the timing of starting to move.

Referring to the above-described embodiment, the following additional notes (a method for manufacturing a laminated fiber body and a method for manufacturing an absorbent article) are disclosed.

<1>
In a method for producing a pile, a pulp fiber obtained by defibrating a pulp sheet drawn from a pulp raw material with a defibrator is supplied to a pile machine together with an air flow to obtain a piled body in which the pulp fibers are deposited. And when supplying the 2nd pulp sheet pulled out from the new pulp original fabric following the 1st pulp sheet supplied to the defibrating machine to the defibrating machine, the 1st supplied to the defibrating machine The second pulp sheet is pulled out at a higher conveying speed than the conveying speed of the one pulp sheet, and the conveying speed of the second pulp sheet is reduced so that the front end of the second pulp sheet follows the end of the first pulp sheet. And the manufacture of the fiber pile which makes the state which the front-end | tip of the said 2nd pulp sheet contacts or approaches the terminal end of the said 1st pulp sheet, and supplies the said 2nd pulp sheet following the said 1st pulp sheet Law.
<2>
A pulp original fabric unwinding machine, a pulp original fabric conveying means, the defibrating machine, and the stacking machine are arranged in this order, and the pulp original fabric conveying means draws the pulp sheet from the pulp original fabric unwinding machine and disassembles the defibrating machine. The method for producing a piled body according to <1>, wherein the fiber sheet conveyance speed is controlled.
<3>
<2> The fiber stack according to <2>, wherein a pulp original fabric detection sensor is arranged in the pulp original fabric unwinder, and a sheet edge distance detection device is provided between the pulp original fabric conveying means and the defibrating device. Production method.
<4>
A sheet cutter is provided between the pulp original fabric arranged in the pulp original fabric unwinding machine and the pulp sheet detection sensor arranged between the pulp original fabric unwinding machine and the pulp original fabric conveying means <3. > The manufacturing method of the laminated fiber body as described in>.
<5>
<4> The method for producing a pile according to <4>, wherein a signal instructing cutting to the sheet cutter is an activation signal for starting an operation of switching to supply of a pulp sheet from a new pulp raw material.
<6>
The distance from the sheet cutter to the pulp supply means disposed on the inlet side of the defibrator is the same for the first pulp sheet and the second pulp sheet. <4> or <5> Method.
<7>
<3> to <6> The sheet end distance detection device includes an imaging device and an illumination device that illuminates the pulp sheet, and further includes an image processing device that processes an image captured by the imaging device. The manufacturing method of the laminated fiber body of any one.
<8>
The leading end of the second pulp sheet that catches up with the terminal end of the first pulp sheet is supplied to the defibrating machine at a conveying speed that is the same as the conveying speed of the first pulp sheet. > The method for producing a laminated fiber body according to any one of the above.
<9>
In the process of deceleration of the second pulp sheet, the leading end of the second pulp sheet catches up with the end of the first pulp sheet without overtaking the end of the first pulp sheet, and the conveying speed of the first pulp sheet <1> to <8> in any one of <1> from which the speed equivalent to this is produced.
<10>
The gap between the first pulp sheet and the second pulp sheet is free from a conveyance error in the step of detecting the gap between the first pulp sheet and the second pulp sheet in the image processing in the sheet edge distance detection device. The second pulp sheet being decelerated continues to decelerate according to a predetermined setting, and when the conveying speed of the first pulp sheet and the second pulp sheet becomes equal, the first pulp sheet and the second pulp sheet When the gap between the two pulp sheets is minimized and the gap between the first pulp sheet and the second pulp sheet is larger than the gap when there is no conveyance mistake, the first pulp sheet and the second pulp The deceleration is temporarily suspended until the gap between the sheets becomes the same as when there is no conveyance mistake, and then the deceleration as set is resumed. At the conveyance speed at which the deceleration is suspended, the second pulp sheet precedes the first pulp. If enough not catch up the clearance is large in Pushito method of stacks according to stop line is determined that the fiberboard splice failure from the <3> to any one of <9>.
<11>
The gap between the first pulp sheet and the second pulp sheet is detected by the sheet edge distance detection device, and the gap between the first pulp sheet and the second pulp sheet is controlled to control the gap from the first pulp sheet. After splicing to the second pulp sheet, the tip of the first pulp sheet of the first pulp sheet newly attached at a predetermined position of the pulp sheet unwinder to which the first pulp sheet is mounted Is set in the pulp original fabric conveying means, the second pulp sheet is used as the first pulp sheet, and a new first pulp sheet is used as the second pulp sheet, and the first pulp sheet and the second pulp sheet are used. The method for producing a laminated fiber body according to any one of <3> to <10>, wherein paper joining of two pulp sheets is alternately repeated.
<12>
The distance from the sheet edge distance detection device (the central position of the travel path of the pulp sheet in the detection device) to the defibrator is preferably 100 mm or more and 1000 mm or less, and more preferably 500 mm or more and 1000 mm or less <3> to <11> The manufacturing method of the piled fiber as described in any one of 1 above.
<13>
The method for producing a piled body according to any one of <1> to <12>, wherein the end of the first pulp sheet is linearly cut.
<14>
The method for producing a piled body according to any one of <1> to <13>, wherein a terminal end of the first pulp sheet is linearly cut in a direction perpendicular to the conveyance direction.
<15>
The method for producing a piled body according to any one of <1> to <14>, wherein a tip of the second pulp sheet is formed linearly in a direction perpendicular to the conveyance direction.
<16>
The method for producing a piled body according to any one of <1> to <15>, wherein an end of the first pulp sheet and a tip of the caught second pulp sheet are parallel to each other.
<17>
Both sides of the tip end of the second pulp sheet are cut obliquely with respect to the conveying direction. <1> to <16>.
<18>
Any one of <1> to <17>, wherein a signal for detecting that the remaining amount of the pulp original fabric of the first pulp sheet has become less than a specified value is an activation signal for starting an operation of switching to supply from a new pulp original fabric The manufacturing method of the laminated fiber body of Claim 1.
<19>
The initial value of the conveyance speed of the second pulp sheet is 105% or more and 130% or less of the set speed of the conveyance speed of the first pulp sheet. <1> to <18> Production method.
<20>
The pile according to any one of <1> to <19>, wherein a conveyance speed of the second pulp sheet caught up with an end of the first pulp sheet is set to a speed equivalent to a conveyance speed of the first pulp sheet. Manufacturing method.
<21>
While the first pulp raw material disposed in the pulp raw material unwinding machine is being supplied, the second pulp raw material is disposed in the pulp raw material unwinding machine, and the second pulp raw material is The method for producing a stacked fiber body according to any one of <2> to <20>, wherein the leading end of the two pulp sheets is pulled out to the pulp original fabric conveying means to place the second pulp original fabric in a standby state.
<22>
The pulp fibers obtained by defibration by the defibrator are supplied together with the air flow in the filthrator and are deposited in the pits for piles on the outer peripheral surface of the rotary drum to obtain a piled product <1> to <21 > The method for producing a laminated fiber body according to any one of the above.
<23>
The method for producing a laminated fiber body according to any one of <1> to <22>, wherein the pulp sheet has a thickness of 0.5 mm to 2 mm.
<24>
The basis weight of a pulp sheet is a manufacturing method of a piled-up body as described in any one of <1> to <23> which is 300 g / m <2> or more and 1500 g / m <2> or less.

<25>
<1> to <24> A manufacturing method of an absorptive article using a piled fiber obtained by a manufacturing method of a piled fiber object given in any 1 of as an absorber.
<26>
The method for producing an absorbent article according to <25>, wherein the fiber stack is coated with a nonwoven fabric or paper to form an absorbent body, and the absorbent body is divided into lengths used for one absorbent article.
<27>
The absorbent article includes a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent disposed between both sheets <25> or <26>. The manufacturing method of the absorbent article as described in any one of.
<28>
The absorbent article manufacturing method according to any one of <25> to <27>, wherein the absorbent article is a disposable diaper, a sanitary napkin, a panty liner, or an incontinence pad.

While the invention has been described in conjunction with the embodiments thereof, it is not intended that the invention be limited in any detail to the description, unless otherwise specified, contrary to the spirit and scope of the invention as set forth in the appended claims. I think it should be interpreted widely.

This application claims priority based on Japanese Patent Application No. 2012-265415 filed in Japan on December 4, 2012, which is hereby incorporated herein by reference. Capture as part.

1 (1a) 1st pulp original fabric 1 (1b) 2nd pulp original fabric 2 (2a) 1st pulp sheet 2 (2ae) Termination of the 1st pulp sheet 2 (2b) 2nd pulp sheet 2 (2bt) 2nd The leading edge of the pulp sheet 3 Pulp fiber 5 Stacked fiber 10 Manufacturing device for stacked fiber 11 Pulp unwinding machine 12 (12a, 12b) Pulp roll conveying means 13 Defiling machine 14 Stacking machine 15 Detection sensor 15a, 15b Anti-detection sensor 15c, 15d Pulp sheet detection sensor 16 Sheet edge distance detection device 17 Pulp supply means 17
61 Imaging device 62 Illuminating device 63 Image processing device 101 Control unit S1 to S8, S1 ′, S2 ′, S6 ′ signal

Claims (15)

1. In a method for producing a pile, a pulp fiber obtained by defibrating a pulp sheet drawn from a pulp raw material with a defibrator is supplied to a pile machine together with an air flow to obtain a piled body in which the pulp fibers are deposited. There,
   When supplying the second pulp sheet drawn from the new pulp raw material following the first pulp sheet supplied to the defibrating machine to the defibrating machine,
   The second pulp sheet is pulled out at a transport speed that is faster than the transport speed of the first pulp sheet supplied to the defibrator, and the leading end of the second pulp sheet continues to the end of the first pulp sheet. Decreasing the conveying speed of the second pulp sheet so that the end of the second pulp sheet is in contact with or close to the end of the first pulp sheet, and the second pulp sheet is placed following the first pulp sheet. A method of manufacturing a stacked fiber body to be supplied.
2. Arrange the raw pulp unwinding machine, the raw pulp conveying means, the defibrating machine, the stacking machine in order,
   The said pulp original fabric conveyance means draws out the said pulp sheet from the said pulp original fabric unwinder, guides it to the said defibrating machine, and manufactures the piled body of Claim 1 which is controlling the conveyance speed of a pulp sheet. Method.
3. 3. The fiber stack according to claim 2, wherein a pulp original fabric detection sensor is disposed in the pulp original fabric unwinding machine, and a sheet edge distance detection device is provided between the pulp original fabric conveying means and the defibrating machine. Production method.
4. A sheet cutter is provided between the pulp original fabric arranged in the pulp original fabric unwinding machine and the pulp sheet detection sensor arranged between the pulp original fabric unwinding machine and the pulp original fabric conveying means. 3. The method for producing a laminated fiber according to 3.
5. The method for manufacturing a stacked fiber body according to claim 4, wherein a signal for instructing cutting to the sheet cutter is an activation signal for starting an operation of switching to supply of a pulp sheet from a new raw pulp.
6. The said sheet edge part distance detection apparatus has an image processing apparatus which has an imaging device and the illuminating device which illuminates the said pulp sheet, and also processes the image image | photographed with the said imaging device. The manufacturing method of the laminated fiber body of any one.
7. The front end of the second pulp sheet that has caught up with the end of the first pulp sheet is supplied to the defibrating machine at a conveying speed that is the same as the conveying speed of the first pulp sheet. The manufacturing method of the laminated fiber of any one of Claims 1.
8. In the process of deceleration of the second pulp sheet, the leading end of the second pulp sheet catches up with the end of the first pulp sheet without overtaking the end of the first pulp sheet, and the conveying speed of the first pulp sheet The manufacturing method of the laminated body of any one of Claim 1 to 7 used as a speed equivalent to.
9. The gap between the first pulp sheet and the second pulp sheet is free from a conveyance error in the step of detecting the gap between the first pulp sheet and the second pulp sheet in the image processing in the sheet edge distance detection device. The second pulp sheet being decelerated continues to decelerate according to a predetermined setting, and when the conveying speed of the first pulp sheet and the second pulp sheet becomes equal, the first pulp sheet and the second pulp sheet When the gap between the two pulp sheets is minimized and the gap between the first pulp sheet and the second pulp sheet is larger than the gap when there is no conveyance mistake, the first pulp sheet and the second pulp The deceleration is temporarily suspended until the gap between the sheets becomes the same as when there is no conveyance mistake, and then the deceleration as set is resumed. At the conveyance speed at which the deceleration is suspended, the second pulp sheet precedes the first. The more the case the gap is large not keep up with Rupushito method of stacks according to any one of claims 3 to 8, to stop the line and determines that the fiberboard splice failure.
10. The gap between the first pulp sheet and the second pulp sheet is detected by the sheet edge distance detection device, and the gap between the first pulp sheet and the second pulp sheet is controlled to control the gap from the first pulp sheet. After splicing to the second pulp sheet, the tip of the first pulp sheet of the first pulp sheet newly attached at a predetermined position of the pulp sheet unwinder to which the first pulp sheet is mounted Is set in the pulp original fabric conveying means, the second pulp sheet is used as the first pulp sheet, and a new first pulp sheet is used as the second pulp sheet, and the first pulp sheet and the second pulp sheet are used. The method for producing a piled product according to any one of claims 3 to 9, wherein the paper joining of two pulp sheets is alternately repeated.
11. The method for manufacturing a piled body according to any one of claims 1 to 10, wherein an end of the first pulp sheet is cut linearly.
12. The method for producing a piled body according to any one of claims 1 to 11, wherein an end of the first pulp sheet and a tip of the caught-up second pulp sheet are parallel to each other.
13. The manufacturing method of the fiber pile of any one of Claim 1 to 10. The front both ends of the said 2nd pulp sheet are cut diagonally with respect to the conveyance direction.
14. The signal which has detected that the remaining amount of the pulp original fabric of the first pulp sheet has become below a specified value is used as an activation signal for starting the operation of switching to the supply from the pulp original fabric of the second pulp sheet. 14. The method for producing a piled product according to any one of items 13 to 13.
15. A method for manufacturing an absorbent article, using as an absorbent body a laminated body obtained by the method for producing a laminated body according to any one of claims 1 to 14.

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