JP5271629B2 - Absorbent manufacturing method and manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorber manufacturing method and manufacturing equipment can stably and continuously manufacture absorbers with a fixed shape. <P>SOLUTION: The manufacturing method of absorbers includes: supplying fiber material 42 in the airborne state on the outer surface of a rotating drum 2 which has depressions 21 for accumulation made on the outer surface to overflowingly accumulate the fiber material 42 in the depressions 21 for accumulation, scraping an excessive fiber material 42C overflowing the depressions 21 for accumulation, returning scraped fiber material 42B to a supply passage for fiber material such as a duct 3 via the return passage, and removing deposits 42 remaining in the depressions for accumulation out of the depressions 21 for accumulation as absorbers. The amount of the fiber material 42B going through the return passage 6 is measured, and a supply amount is adjusted to maintain the fiber material 42B going through the return passage in a certain range to manufacture absorbers 9. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an absorbent body manufacturing method and manufacturing apparatus.

As a method of manufacturing absorbent bodies for absorbent articles such as sanitary napkins, panty liners, and disposable diapers, fiber material supplied in association with the airflow flowing in the duct is provided on the outer peripheral surface of the rotating drum (stacking drum). A method is known in which an accumulation body is sucked and deposited, and the deposited body is used as it is or coated with paper, a breathable nonwoven fabric or the like to form an absorbent body.
In addition, as a method of manufacturing such an absorbent body, fibers defibrated by a defibrator are deposited to such an extent that they overflow into the accumulation recesses, and then excess fibers overflowing from the accumulation recesses are scraped off to a scraping roll or the like. There is also known a technique of scraping off and scraping and returning the scraped fiber to the vicinity of the entrance of the defibrating machine or duct (see Patent Documents 1 to 3).

  In addition, although it is not the technique regarding manufacture of an absorber in patent document 4, as a technique using an electrostatic capacitance measurement means, an air blowing nozzle and an electrostatic capacitance measurement are carried out between conveyance connected between a tank and an injector. A technique is described that includes means for adjusting the flow rate of the air that supplies the powder coating material in accordance with the measured capacitance value.

JP-A-60-236646 JP 2006-500155 A Japanese Patent No. 3462232 JP-A-8-337322

The above-described technology for scraping and reusing excess fibers overflowing from the accumulation recesses has the advantage that the material can be used without waste, but it causes inconvenience in stably producing an absorbent body having a fixed shape. There was a case.
In other words, when excess fiber overflowing from the accumulation recess is scraped and reused, the amount of fiber deposited in the accumulation recess gradually increases even if the amount of newly supplied fiber is kept constant. Or, if it increases, there is a problem that the return pipe is clogged with fibers or a large lump of fibers is mixed into the absorber. Inconveniences such as defective products that are partially missing occur.
Moreover, unlike a simple granule, the pulp etc. used for an absorber are easy to be agglomerated, and supply unevenness is likely to occur. In addition, the production line stops when operating, and there are changes in the operating speed such as deceleration and acceleration, and the speed on the supply side is changed accordingly, but it is difficult to control the supply amount constant. is there.

  Therefore, the objective of this invention is providing the manufacturing method and manufacturing apparatus of an absorber which can carry out the stable continuous production of the absorber of a fixed shape.

  In the present invention, a fiber material is supplied in a scattered state to a rotating drum having an accumulation recess formed on the outer peripheral surface, and the fiber material is deposited so as to overflow the accumulation recess, and overflows from the accumulation recess. The excess fiber material is scraped off, and the scraped fiber material is returned to the fiber material supply path via the return conveyance path, and the deposit remaining in the accumulation recess is used as an absorber from the accumulation recess. In the manufacturing method of the absorber to be released, the amount of the fiber material passing through the return transport path is measured, and the supply amount is adjusted so as to maintain the amount of the fiber material passing through the return transport path within a certain range. The object is achieved by providing a manufacturing method of an absorbent body, which manufactures the absorbent body.

  The present invention relates to a rotating drum having an accumulation recess formed on the outer peripheral surface, a duct that supplies fiber material in a scattered state toward the outer peripheral surface of the rotating drum, and a fiber material supply that supplies the fiber material to the duct. A scuffing roll that scrapes off an excessive amount of fiber material deposited so as to overflow the accumulation recess, and a return conveyance path that returns the fiber material scraped by the scuffing roll to the inside of the duct or the fiber material supply unit. The object is achieved by providing an apparatus for manufacturing an absorbent body comprising a fiber amount measuring device for measuring the amount of fiber material flowing in the return conveyance path.

  According to the manufacturing method and the manufacturing apparatus of the absorber of the present invention, it is possible to stably and continuously produce an absorber having a constant shape.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
As shown in FIG. 1, an absorbent body manufacturing apparatus 1 according to an embodiment of the present invention includes a rotary drum 2 having a plurality of accumulation recesses 21 (deposition portions) formed at predetermined intervals on an outer peripheral surface, and a rotating drum 2. To the outer peripheral surface of the drum 2, the fiber material 42 is supplied in a scattered state, the fiber material supply unit 4 that supplies the fiber material 42 to the duct 3, and the accumulation recess 21 so as to overflow. The scuffing roll 5 for scraping off an excessive amount of fiber material, the return material path 6 for returning the fiber material 42B scraped with the scuffing roll 5 into the duct 3, and the amount of the fiber material 42B flowing in the return value path 6 are measured. A fiber quantity measuring device 7 that performs the control, a fiber supply amount control unit 8 that controls the amount of the fiber material 42A supplied from the fiber material supply unit 4 into the duct 3, and a deposit (absorber) that is released from the concave portion 21 for accumulation. ) 9 Cover the top and bottom surfaces And a coating mechanism for coating with window 91 (not shown). The return conveyance path 6 returns the fiber material 42 </ b> B scraped off by the scuffing roll 5 into the duct 3, and the fiber material 42 </ b> B returned into the duct 3 is supplied again to the outer peripheral surface of the rotary drum 2.

  The rotary drum 2 has a cylindrical shape and is driven to rotate at a constant speed in the direction of arrow A in FIG. On the outer peripheral surface of the rotating drum 2, accumulation concave portions 21, 21... Having a shape corresponding to the shape of the absorber 9 to be manufactured are formed. FIG. 2 shows the accumulation recess 21 in the apparatus shown in FIG. 1 and the three-dimensional absorber 9 corresponding to the accumulation recess 21. The absorbent body 9 shown in FIG. 2 is an absorbent body of an absorbent article such as a sanitary napkin or an incontinence pad. When the absorbent body 9 is used by being incorporated in the absorbent article, the absorbent body 9 or the rupture of the wearer is used. A projecting portion 92 is provided at a portion arranged to face. The convex part 92 is integrally formed with the other part 93 of the absorber 9, and no boundary surface exists between them.

An intake fan (not shown) is connected to the non-rotating portion inside the rotating drum 2 (on the rotating shaft side), and the partitioned spaces B and C inside the rotating drum are negatively driven by driving the intake fan. Pressure can be maintained. The bottom surface portion of each collecting recess 21 is formed of a mesh plate and has a large number of pores. While the individual accumulation recesses 21 pass through the spaces B and C maintained at negative pressure, the pores at the bottom of each accumulation recess 21 function as suction holes. As shown in FIG. 2A, a part of the bottom surface portion 21 a of the accumulation concave portion 21 in the present embodiment is recessed in a shape corresponding to the convex portion 92 of the absorber 9.
The space B is located behind the portion of the rotating drum 2 that is covered with the duct 3. The space B generates a strong suction force on the bottom surface of the accumulation recess 21 passing through the portion covered with the duct 3, thereby collecting the fiber material in the accumulation recess 21, or generating an air flow for conveying the fiber material. In order to generate in the duct 3, the degree of negative pressure is maintained higher than the space C (atmospheric pressure is low).
The reason why the space C is maintained at a negative pressure is to carry the deposit or absorber in the accumulation recess 21 while holding it.

The duct 3 has one end 31 that covers a part of the outer peripheral surface of the rotating drum 2 and the other end 32 connected to the fiber material supply device 4, and the accumulation recess 21 located on the space B. The air flow that flows toward the outer peripheral surface of the rotating drum 2 is generated in the duct 3 by suction from the bottom surface portion of the rotating drum 2.
The fiber material supply unit 4 includes a defibrating machine 41. A sheet-like raw material 43 such as a pulp sheet is introduced into the defibrating machine 41 by nip rollers 44 and 44 for supplying the raw material, and the defibrated fiber material 42 is supplied. It is configured to be supplied into the duct 3.

As shown in FIGS. 3A and 4, the scuffing roll 5 has a cylindrical roll body 51 and a large number of scraping protrusions 52 erected on the outer peripheral surface of the roll body 51. Then, while rotating in one direction indicated by an arrow E in FIG. 4, excess fiber material 42 </ b> C overflowing from the accumulation recess 21 is scraped off by the protrusion 52. The excessive amount of fiber material 42 </ b> C is a portion of the fiber material 42 accumulated in the accumulation recess 21 that is accumulated beyond the height position of the surface (outer peripheral surface 2 a of the rotating drum) where the accumulation recess 21 opens. The protrusion 52 in this embodiment is comprised from the brush. In FIG. 3A, reference numeral 53 denotes a rotation shaft of the scuffing roll 5. In FIG. 3B, the fibrous material 42 after the excess fiber material 42 </ b> C is scraped off by the scuffing roll 5. The deposition state of is shown. As shown in FIG. 3B, the upper surface 9 a of the deposit 9 after being scraped off by the scuffing roll 5 is positioned at substantially the same height as the outer peripheral surface 2 a of the rotating drum 2.
The distance from the tip of the projection 52 of the scuffing roll 5 to the outer peripheral surface 2a is 0 mm to 5 mm so that the upper surface 9a of the deposited body 9 after being scraped is substantially the same height as the outer peripheral surface 2a of the rotating drum 2. The scuffing roll 5 is preferably installed so that the thickness is preferably 0.5 mm to 2 mm. By preventing the distance from being negative (when the tip of the protrusion 52 exceeds the position of the outer peripheral surface 2a and entering the concave portion for accumulation), the drum surface itself is prevented from being scraped by the protrusion 52. When the distance is not too long, it is possible to prevent the fiber material from protruding from the stacking concave portion from becoming unclear.

It is preferable that the scuffing roll 5 has a higher linear velocity between the scuffing roll 5 and the rotary drum 2. The linear velocity of the scuffing roll 5 is the tip of the protrusion 52, and the linear velocity of the rotary drum 2 is the tangential velocity on the drum surface.
In order to release the deposit 9 remaining in the accumulation recess 21 from the accumulation recess 21, the space D partitioned in the rotary drum 2 is maintained at a positive pressure by a not-shown pressurizing means, and the accumulation recess 21. The air is blown out from the pores of the bottom surface of the substrate and sucked from the vacuum conveyor 10 side. The mold 9 is released from the belt conveyor. In the example shown in FIG. 1, a covering sheet 91 is supplied onto the vacuum conveyor 10, and the deposit 9 is released from the covering sheet 91. Thereby, the lower surface of the deposit 9 is covered with the covering sheet 91.

  The return conveyance path 6 is formed from a return pipe 60 having openings at both ends. The return conveyance path 6 has one end 61 opened in the vicinity of the scuffing roll 5 and the other end 62 opened in the duct 3 at a substantially central portion in the longitudinal direction of the duct 3 (substantially the same as the air flow direction). doing. As shown in FIG. 4, one end 61 of the return conveyance path 6 opens into a space F partitioned from the other part of the duct 3 by the partition plate 63, and extends from the bottom surface of the accumulation recess 21. Due to the suction, a pressure difference is generated between the one end portion 61 and the other end portion 62 of the return conveyance path 6, and an air flow is generated in the return conveyance path 6 due to this pressure difference. The fiber material 42B scraped off by the scuffing roll 5 flows in the return conveyance path 6 by this air flow, is introduced into the duct 3 from the other end 62, and is resupplied toward the outer peripheral surface of the rotary drum 2. . The return pipe 60 in the present embodiment has a substantially circular cross section, but it is also possible to use an arbitrary shape such as an ellipse or a rectangular cross section. In the section B, the suction force of the accumulation concave portion is strong on the upstream side where the fiber material is not deposited so much, and is weak on the downstream side where the fiber material is sufficiently accumulated. Therefore, the suction force of the one end portion 62 of the return conveyance path is strong, and the suction force of the other end portion 61 is weak.

The fiber amount measuring device 7 measures the amount of the fiber material 42B flowing in the return conveyance path 6, and in the return conveyance path 6 in cooperation with the measuring device alone or the fiber supply amount control unit 8 described later. What can measure the quantity of the flowing fiber material 42B can be used without a restriction | limiting in particular.
As the fiber amount measuring device 7, various known devices can be used. For example, a mass flow rate method, a laser method, a capacitance method, and a combination of these can be used. Among these measuring devices, capacitance measuring devices are suitable for measuring insulators such as cellulose fibers such as pulp fibers, rayon fibers and cotton fibers used as materials for absorbent articles, and synthetic fibers such as polyethylene. This is preferable.

Capacitance represents the ability to store a charge when a substance is inserted between electrodes, and varies depending on the specific dielectric constant of the substance, the distance between electrodes, and the electrode area. The capacitance type measuring device measures the change in the current value when the substance is passed between the electrodes to which a voltage is applied. Since the output value changes according to the volume of the substance passing between the electrodes, the amount of the substance passing between the electrodes can be grasped by grasping the change in capacitance.
In the present embodiment, in order to measure the amount of the fiber material 42B flowing through the return pipe 60 with the capacitance-type measuring device 7, two electrodes of the measuring device 7, that is, the detection electrode and the ground electrode are used. These are arranged spirally so that the fiber material 42B passes between both electrodes.

  The fiber amount measuring device 7 for measuring the fiber material flowing in the return conveyance path 6 is preferably installed in a linear portion of the return conveyance path 6 because the passing position of the fiber material 42B is not biased. Further, from the viewpoint of promptly feeding back the measured value, such a measuring device is preferably arranged at a position close to the scuffing roll 5, and when a blower 64 or the like is arranged in the return conveyance path 6 as will be described later. It is preferable to install in the front side (one end part 61 side) rather than the position of the blower 64.

  The fiber supply amount control unit 8 controls the amount of the fiber material 42 supplied into the duct 3 to a predetermined range, and in this embodiment, the speed at which the sheet-like raw material 43 is fed into the defibrator 41. By changing the amount, the amount of the fiber material 42 supplied from the fiber material supply unit 4 into the duct 3 is controlled. The feeding speed of the raw material 43 can be controlled by increasing / decreasing the rotational speed of the nip rollers 44, 44 that feed the raw material 43 into the defibrator 41. The rotational speed of the nip rollers 44, 44 is a drive motor 45 that drives them. The control signal (voltage, current, digital signal, etc.) can be changed or maintained in a predetermined state.

Although not shown in detail, the fiber supply amount control unit 8 includes a computer having a display unit, an interface for electrically connecting the computer and other devices, a predetermined program incorporated in the computer, and the like. Yes. A signal is input to the computer from the fiber quantity measuring device 7, and changes in the fiber material flowing through the return conveyance path 6 are recorded in a storage device such as an HDD or RAM and displayed on the display unit. Further, a control signal is output from the computer to the drive motor 45, and the supply amount of the fiber material 42A to the duct 3 is controlled by controlling the rotational speed of the drive motor 45 to which the control signal is input. ing.
The covering mechanism (not shown) is a mechanism for covering the upper and lower surfaces of the deposit (absorber) 9 released from the accumulation recess 21 with a covering sheet 91 by a known mechanism. In the present embodiment, after the deposit (absorber) 9 is placed in the center in the width direction of one strip-shaped covering sheet 91 (see FIG. 1), both sides of the strip-shaped covering sheet 91 are connected to a known folding mechanism. The upper and lower surfaces of the deposit (absorber) 9 are covered with a single cover sheet 91 by folding (not shown). In addition, as a method for covering the upper and lower surfaces of the deposit (absorber) 9 with the covering sheet 91, various known methods can be adopted, and the deposit (absorber) 9 is placed on one strip-shaped covering sheet 91. After that (see FIG. 1), the upper surface side of the deposit (absorber) 9 may be covered with another cover sheet separate from the cover sheet 91. As the covering sheet, thin paper (tissue paper), liquid-permeable nonwoven fabric, or the like can be used. The deposited body (absorbent body) 9 whose upper and lower surfaces are covered with one or a plurality of strip-shaped covering sheets 91 is cut into a length corresponding to one absorbent article by an arbitrary cutting means in a later step. The
In the present embodiment, for convenience, the deposit 9 is an absorber, and the absorber and the cover sheet 91 are separately described. However, the deposit 9 covered with the cover sheet 91 may be an absorber.

An embodiment of a method for continuously producing a deposit (absorber) 9 using the absorber production apparatus 1 described above, that is, an embodiment of the method for producing an absorber of the present invention will be described.
In order to manufacture the absorbent body 9 using the absorbent body manufacturing apparatus 1, the rotary drum 2 and the scuffing roll 5 are rotated, and the intake fan and the pressurizing means are operated to make the spaces B and C negative. The space D is set to a positive pressure. Moreover, the vacuum conveyor 10 is operated.
By the operation of the intake fan, a suction force is generated on the bottom surface portion of the accumulation recess 20 located on the space B, and an air flow that flows toward the outer peripheral surface of the rotary drum 2 is generated in the duct 3. An air flow is also generated in 6.

  Then, when the fiber material supply device 4 is operated to supply the fiber material 42 into the duct 3, the fiber material 42 is in a scattered state and is placed on the air flow flowing in the duct 3, so that the rotating drum 2 Supplied toward the outer peripheral surface.

In the present embodiment, the fiber supply amount control unit 8 accumulates the fiber material so as to overflow the individual accumulation recesses 21 and maintains the amount of the fiber material 42B passing through the return conveyance path 6 within a certain range. In this way, the absorber is continuously produced.
Specifically, the amount of fiber passing through the return pipe 60 is measured based on the value (voltage, current, digital signal, etc.) output from the fiber amount measuring device 7 so that the amount of fiber falls within a certain range. To control. The amount of the fiber material passing through the return conveyance path 6 is determined by measuring the amount of the fiber material passing through the return conveyance path 6 per unit time, and maintaining the amount of passage per unit time in a certain range. It is preferable to adjust the supply amount. Here, the “amount of passage for a certain period of time” is, for example, per time when one or a plurality of deposits (absorbers) 9 pass through a specific position in the apparatus (for example, the arrangement position of the scuffing roll 5). It is also possible to set the amount per hour or the amount per time set arbitrarily.

As a method for calculating the fiber amount from the value output from the fiber amount measuring device 7, any method such as a method using the peak of the measured value and a method using the integrated value of the measured value can be adopted. Is preferred.
As a control method for maintaining the fiber amount within a certain range, the upper and lower limits of the fiber amount of the return conveyance path 6 are set, and the monitored fiber amount exceeds or exceeds the upper limit value. When predicted (predictive control), the supply amount of the fiber material 42A from the fiber material supply unit 4 is decreased so that the fiber amount decreases, while it is predicted that the supply amount is below or below the lower limit. (Predictive control), the supply amount of the fiber material 42A from the fiber material supply unit 4 is increased so that the fiber amount increases. In other cases, the supply amount of the fiber material 42A is kept constant. There are ways to keep it.
Further, as another method for maintaining the amount of the fiber material 42B in a certain range, a target value of the amount of fiber passing through the return conveyance path 6 is set, and the amount of fiber passing through the return conveyance path 6 is the target value. The supply amount of the fiber material 42A can be constantly increased or decreased so as to approach the value.

  Moreover, it is preferable that the control mentioned above performs PI control or PID control from the measured value and target value per one or several absorptive articles. For this control, a signal corresponding to one or a plurality of absorbent articles is generated by attaching an encoder to the rotary drum 2 or the like, and one or a plurality of absorbent articles are used by using the signal. The amount of fiber material scraped or the amount of fiber passing through the return conveyance path is calculated. Then, control is performed so that the calculated value approaches the target value. The control described in this specification is preferably performed automatically by a program stored in the fiber supply amount control unit 8, but may be partially or wholly performed manually.

  In the absorbent body of the present embodiment, the above-described control is performed when the absorbent body is manufactured by depositing the fiber material into each accumulation recess 21 and scraping off the excessive amount of fiber material overflowing from each recess 21. Therefore, the fiber material can be deposited so as to overflow over the entire area of the accumulation recess 21, and the overflow amount can be maintained at a necessary and sufficient amount. Therefore, the deposit (absorber) 9 released from the accumulation recess 21 has a three-dimensional shape that conforms to the shape of the accumulation recess 21 and is less likely to have a defect. Further, since the amount overflowing from the accumulation concave portion 21 is controlled within a certain range and does not become excessive, clogging of fibers occurs in the return conveyance path 6 or a large lump of fibers is generated and mixed into the absorber. There is no inconvenience. Thus, according to the present embodiment, it is possible to stably and continuously produce an absorbent body having a constant shape.

  As the fiber material used in the present invention, various materials conventionally used for absorbent bodies of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation. For example, short fibers of cellulosic fibers such as pulp fibers, rayon fibers, and cotton fibers, and short fibers of synthetic fibers such as polyethylene are used. These fibers can be used alone or in combination of two or more. Moreover, it is preferable that the fiber material is entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%. In addition to the fiber material, a deodorant or an antibacterial agent may be supplied into the duct as necessary. Moreover, you may supply an absorptive polymer.

As mentioned above, although one Embodiment of the manufacturing method and manufacturing apparatus of the absorber of this invention was described, this invention is not restrict | limited to embodiment mentioned above, Each can be changed suitably.
For example, as shown in FIG. 5A, forcible air supply means such as a blower 64 may be provided in the middle of the return conveyance path 6 (return pipe 60). As in the embodiment shown in FIG. 5A, forcible air supply means such as a blower 64 is provided in the return conveyance path 6 and the air flow for conveying the fiber material 42B is enhanced by the forced air supply means. When the length of the return conveyance path 6 is relatively long or when the return conveyance path 6 is provided with a large number of bent portions, a pressure difference between the one end 61 and the other end 62 of the return conveyance path 6 is unlikely to occur. Suitable for cases.

In the embodiment shown in FIG. 1, the fibers 42B scraped by the scuffing roll 5 are resupplied to the duct 3, but the resupply position is not limited thereto. For example, the fibers 42B scraped off by the scuffing roll 5 may be returned to the defibrator 41 as shown in FIG. Moreover, as shown in FIG.5 (c) and FIG.5 (d), as shown in FIG.5 (c), as shown in FIG.5 (c), the stock part 4A is provided in the position spaced apart from the defibrating machine 41, and the scraped fiber 42B is provided. The fiber defibrated by the defibrator 41 can be returned to the connecting pipe 46 or the like that carries the stock part 4A, or can be returned to the stock part 4A as shown in FIG. 5 (d). In the embodiment shown in FIG. 5C and FIG. 5D, the amount of the fiber 42B passing through the return conveyance path 6 is measured by the fiber amount measuring device 7, and the feed is made so that the amount falls within a certain range. The rotational speed of the roll 47 is controlled. As the rotational speed of the feed roll 47 increases, the amount of fibers 42 introduced from the stock portion 4A to the duct 3 increases with a constant relationship such as proportionality.
The supply position when the fiber 42B scraped off by the scuffing roll 5 is re-supplied to the duct 3 is not limited to the position shown in FIG. 1, and can be re-supplied to other parts of the duct 3.
In the absorbent body manufacturing apparatus 1 shown in FIG. 1, the fiber material 42 is supplied to the rotary drum 2 via the fiber material supply unit 4 and the duct 3, and the fiber material supply unit 4 and the duct 3 are This constitutes the fiber material supply path. Then, the fiber material 42 </ b> B scraped off by the scuffing roll is re-supplied to the duct 3 through the return conveyance path 6.

In the above-described embodiment, the upper and lower surfaces of the deposit (absorber) 9 released from the accumulation recess 21 are covered with the covering sheet 91, but the deposit (absorber) released from the accumulation recess 21. 9 can be used as an absorbent body such as an absorbent article without covering one or both sides with the covering sheet 91.
In the above-described embodiment, the absorber 9 having the convex portion 92 on a part of one surface is manufactured. However, the deposit body (absorber) 9 having no convex portion 92 may be manufactured. The present invention is particularly suitable for the production of an absorber having one or a plurality of convex portions on one side and a thin absorber.
Further, the accumulation recesses 21 in the above-described embodiment are formed on the outer peripheral surface of the rotating drum 2 at a certain interval in the circumferential direction. However, the accumulation recesses in the present invention are the outer periphery of the rotation drum. It may be formed on the surface so as to be continuous in the circumferential direction.
Further, the direction of rotation of the scuffing roll 5 may be opposite to the direction indicated by the arrow E in FIG. 4 (the same direction as the rotation direction of the rotary drum 2).

  The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

It is a schematic diagram which shows one Embodiment of the manufacturing apparatus of the absorber of this invention. (A) It is a schematic diagram which shows the recessed part for integration | stacking in the manufacturing apparatus shown in FIG. 1, and (b) the solid-shaped absorber corresponding to this recessed part for integration | stacking. (A) One specific example of a scuffing roll and (b) It is a figure which shows the deposition state of the recessed part for accumulation | stacking after scraping off with a scuffing roll. It is a schematic diagram which shows a mode that the fiber material which overflowed from the recessed part for accumulation is scraped off with a scuffing roll. It is a figure which shows other embodiment of this invention, (a) Embodiment which provided the forced air supply means in the return conveyance path, (b) Embodiment which returns the scraped fiber material to a defibrator, (c) Scraping It is a figure which shows embodiment which returns the taken fiber material to the connection pipe | tube which connects a fibrillator and a stock part, (d) Embodiment which returns the scraped fiber material to a stock part.

DESCRIPTION OF SYMBOLS 1 Absorbent body manufacturing apparatus 2 Rotating drum 21 Concave for accumulation 3 Duct 4 Fiber material supply part 42 Fiber material 43 Sheet-shaped raw material 5 Scuffing roll 6 Return conveyance path 60 Return pipe 7 Fiber quantity measuring device 8 Fiber supply quantity control part 9 Deposit (absorber)
92 Convex 10 Vacuum Conveyor

Claims (7)

An excess amount of fibers overflowing from the accumulation recesses are supplied to the rotating drum having the accumulation recesses formed on the outer peripheral surface in a scattered state, and the fiber material is deposited so as to overflow the accumulation recesses. Absorption that scrapes off the material, returns the scraped fiber material to the fiber material supply path via the return conveyance path, and releases the deposit remaining in the accumulation recess from the accumulation recess. A method for manufacturing a body,
Passing per predetermined time of the fiber material through the refunded conveying path is measured, by adjusting the supply amount so as to maintain the throughput per the predetermined time to a certain extent, to manufacture of the absorber, Manufacturing method of absorber. Wherein the amount of fibrous material through the refunded conveying path, measured using a fiber quantity measuring device provided in the return conveyance path該返method of the absorber of Claim 1 Symbol placement. The manufacturing method of the absorber of Claim 1 or 2 whose said fiber quantity measuring device is an electrostatic capacitance type measuring device. The said return conveyance path has a linear part, The manufacturing method of the absorber of any one of Claims 1-3 which measures the quantity of the fiber material which passes along this linear part. The said recessed part for accumulation | stacking has a hollow part in a part of the bottom face part, and manufactures the absorber from which the part corresponding to this hollow part protruded, The absorber of any one of Claims 1-4 Production method. Through the duct, supplying the fibrous material into the rotary drum, the scraped fiber material, re-supplied to the duct through the refunded conveyance path, of any one of claims 1 to 5 Manufacturing method of absorber. A rotating drum having a concave portion for accumulation on the outer peripheral surface, a duct for supplying fiber material in a scattered state toward the outer peripheral surface of the rotating drum, a fiber material supply unit for supplying fiber material to the duct, and an integration A scuffing roll for scraping off an excessive amount of the fiber material deposited so as to overflow the concave portion, a return transport path for returning the fiber material scraped by the scuffing roll to the inside of the duct or the fiber material supply section, and the return transport A fiber amount measuring device that measures the amount of the fiber material flowing in the path, and a fiber supply amount control unit that controls the amount of the fiber material that passes through the return conveyance path to be maintained in a certain range ,
The fiber supply amount control unit measures the amount of fiber material passing through the return conveyance path per fixed time and adjusts the supply amount so that the amount of pass per fixed time is maintained in a certain range. Body manufacturing equipment.

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