JP2006115999A - Manufacturing apparatus for absorbent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form an absorbent in a laminated state by a simple operation without a risk of layers being separated. <P>SOLUTION: The fiber accumulating device for the absorbent is characterized by a spray pipe for spraying absorbent substance different from crushed pulp. The spray pipe is disposed so that a spray port thereof faces the outer surface of a fiber accumulation drum near the outer surface of the fiber accumulation drum. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an absorbent body manufacturing apparatus used for absorbent articles such as disposable diapers, sanitary napkins, and wipes.

  Absorbents for absorbing urine, feces, menstrual blood, and the like are used in absorbent articles such as disposable diapers, sanitary napkins, and wipes. Such an absorber is manufactured by, for example, a manufacturing apparatus (conventional example) 101 shown in FIG. The absorber manufacturing apparatus includes a defibrating device 104 for finely pulverizing the supplied pulp material 100, a pulverized pulp supply casing 108 surrounding the defibrating device, and a downstream opening of the pulverized pulp supply casing 108. And a stacking drum 110 disposed in the section. The pulverized pulp supply casing 108 constitutes an exterior of the chamber C for carrying the pulverized pulverized pulp on an air stream and transporting it to the outer peripheral surface of the downstream fiber stacking drum.

The pulverized pulp supply casing 108 is provided with a polymer supply port 106 for supplying an absorbent polymer different from the pulverized pulp in the chamber, and the pile drum 110 has an appropriate outer peripheral surface. Absorber forming recesses are formed at intervals, and the pulverized pulp conveyed by air into the absorber forming recesses is absorbent by maintaining the inside of the fiber stack drum 110 at a negative pressure by suction means (not shown). It is configured to be stacked while being mixed with a polymer. Absorbent body S ′ produced on fiber stacking drum 110 is transferred to the upper surface of crepe paper 150 transported on the vacuum conveyor by suction by vacuum device 149 and transported on the conveyor and sent to the downstream processing step as it is. It is done.
JP 2002-272784 A

  However, in the conventional apparatus, the pulverized pulp and the polymer are mixed while being mixed by the air flow in the chamber and are piled in the recess for forming the absorber, so that the polymer supply port is secured to ensure the mixing time of the polymer and the pulverized pulp. 106 was provided upstream in the chamber. For this reason, it was possible to change the composition (mixing ratio) of the absorber by changing the supply amount of pulverized pulp and polymer, but changes in matters other than the composition, for example, pulverized pulp and polymer were laminated Or partially increasing or decreasing the polymer basis weight or partially forming a bulky part.

  An apparatus for manufacturing an absorbent body having a laminated structure, for example, as shown in Japanese Patent Laid-Open No. 7-150156, is an absorption formed by arranging a pair of piled drums on the left and right, and piled up with one piled drum. A manufacturing method is proposed in which an absorbent body formed by stacking with the other stacking drum is superposed on the upper surface of the body, and then transferred onto the conveyor belt. However, the structure of the apparatus is special and complicated, and the layers are individually stacked and stacked, so that there is a drawback that the entanglement between the layers is poor and the absorber becomes highly susceptible to delamination.

  Accordingly, a main object of the present invention is to provide an absorbent fiber stacking device capable of forming a laminated absorbent body without the possibility of delamination by a simple operation.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
By sucking from the inner surface of the stacking drum, the pulp supplied into the chamber is carried on an air stream and conveyed, and the absorbent body manufacturing apparatus for forming the absorber by stacking the outer periphery of the stacking drum There,
A spray tube for spraying at least one of an absorbent material and functional powder different from the pulverized pulp is provided, and the spray port located at the tip of the spray tube is close to the outer peripheral surface of the stacking drum. An absorbent body manufacturing apparatus is provided, wherein the absorbent material is sprayed from the spray port toward the outer peripheral surface of the fiber stacking drum.

<Invention of Claim 2>
The absorber manufacturing apparatus according to claim 1, wherein the tip of the spray tube is formed in a fan shape, and the fan-shaped tip portion is arranged to cover a part of the outer peripheral surface of the drum.

<Invention of Claim 3>
The absorber manufacturing apparatus according to claim 1, comprising a plurality of spraying tubes.

<Invention of Claim 4>
The manufacturing apparatus of the absorber of any one of Claim 1 to 3 with which the some spreading | diffusion pipe is arranged in parallel by the fiber pile drum rotation direction.

<Invention of Claim 5>
The manufacturing apparatus of the absorber of any one of Claims 1-4 in which the some spreading tube is arranged in parallel by the fiber pile drum width direction.

<Invention of Claim 6>
The absorbent body manufacturing apparatus according to any one of claims 1 to 5, wherein the spray pipe is movable while maintaining a state in which the spray port faces the drum outer peripheral surface.

<Invention of Claim 7>
The inner surface side of the stacking drum is partitioned, and suction means for sucking at least one of pulverized pulp and another absorbent material and functional powder is provided for each section. The manufacturing apparatus of the absorber as described in a term.

  According to the present invention, there is provided a spray pipe for spraying an absorbent substance such as a polymer other than the pulverized pulp and / or functional powder such as a deodorant material, an antibacterial material, and an indicator. Since the spraying port located at the tip is arranged so as to face the outer peripheral surface of the stacking drum, and the absorbent material and the like are sprayed from the spraying port toward the outer surface of the stacking drum, The absorbent material and the like discharged from the spout can be laminated on the pulverized pulp layer or between the pulverized pulp layers without being completely mixed with the pulverized pulp. It is not necessary for the spout to face the outer circumferential surface of the stacking drum completely in parallel, and the sprinkling port substantially faces the outer peripheral surface of the stacking drum, and other absorption toward the outer surface of the stacking drum. It suffices that the openings are opened so that a sex substance or the like is dispersed.

  Further, the sprinkling port according to the present invention is close to the outer peripheral surface of the drum, but is not in contact with it, so that the absorbent material or the like sprayed from the sprinkling port reaches the outer peripheral surface before pulverized pulp. And some mixing. Therefore, there is much less risk of delamination compared to a laminated absorbent body formed by forming and laminating each layer separately. Then, the degree of lamination, the degree of mixing with other pulverized pulp, and the lamination thickness of each layer can be achieved by a simple operation of changing the supply amount of the absorbent material and the like per unit time.

  Further, by providing a plurality of spray pipes, it is possible to create an absorbent body in which two or more kinds of absorbent materials and the like are pulverized pulp and laminated body according to the number of installed pipes. If a plurality of spray tubes are arranged side by side in the direction along the axial direction of the pile drum, it is possible to partially increase or decrease the amount of absorbent material, or to partially form a bulky part. Become. These can also be achieved by a simple operation of changing the supply amount of the absorbent material per unit time.

  On the other hand, by forming at least the tip of the spray tube in a fan shape, it is possible to supply an absorbent material or the like to the drum outer peripheral surface while appropriately considering the air flow in the chamber. For example, the air flow direction and flow velocity in the vicinity of the outer peripheral surface of the stacking drum can be appropriately adjusted. Further, since at least the tip of the spray tube is divergent toward the spray port, it becomes easy to supply the absorbent material and the like uniformly to the outer peripheral surface of the drum.

  Furthermore, by configuring the spray tube to move back and forth, right and left or up and down while maintaining the state where the spray port faces the outer peripheral surface of the drum, any design of the absorber is facilitated.

  In particular, the spray tube extends from the side of the drum to above the drum outer peripheral surface, then bends above the drum outer peripheral surface, and opens at a position extending a predetermined length along the drum outer peripheral surface in the direction of drum movement. By doing so, the air flow in the chamber is not obstructed, that is, the influence on the transportability of the pulverized pulp can be reduced, and the lamination of the absorbent material and the pulverized pulp is suitably adjusted with respect to the outer peripheral surface of the drum. It becomes possible.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of an absorbent body manufacturing apparatus according to the present invention, and FIG. 2 is a plan view of the vicinity of the fiber stacking drum. FIG. 3 is a perspective view around the tip of the spray tube. FIG. 4 is an enlarged front view of the tip portion of the spray tube, FIG. 5 is a sectional view taken along the line IV-IV, and FIG. 6 is a schematic diagram showing a cross section of the fiber pile drum and the spray tube.

  The absorbent body manufacturing apparatus 1 mainly includes a defibrating apparatus 5 for defibrating the pulp base paper 3 sent into the apparatus, a pulverized pulp supply casing 8 surrounding the defibrating apparatus 5, and the pulverized pulp supply casing 8. The fiber stacking drum 10 is provided at the downstream opening of the knives. The pulverized pulp supply casing 8 constitutes a part of the exterior of the chamber C for carrying the pulverized pulverized pulp on an air flow.

  Hereinafter, in detail, the pulp base paper 3 fed out from the pulp raw fabric 2 disposed at the adjacent position of the absorbent body manufacturing apparatus 1 is supplied to the defibrating apparatus 5 through the guide rollers 4, 4. . The defibrating device 5 is provided with a large number of grinding blades on the roll surface, and finely defibrate the supplied pulp base paper 3. The pulverized pulverized pulp 7 is carried downstream by riding on an air flow in the chamber C by a suction action by a fiber drum 10 described later.

  On the other hand, the absorbent body manufacturing apparatus 1 has an absorbent material P different from the pulverized pulp 7 (hereinafter, the absorbent material will be described as a polymer, but is not limited thereto. Deodorant material and antibacterial material) Or a functional powder such as an indicator, etc. The functional powder is not particularly limited.) A pair of two sprays for supplying the chamber C from a storage tank (not shown). Tubes 6 and 6 are provided. Each spreading tube 6, 6 is inserted into the chamber C from the side of the pile drum 10, and extends above the pile drum outer peripheral surface 10 </ b> S. The tip is positioned close to the outer peripheral surface of the stacking drum. Each tip portion 6T extended on the outer peripheral surface of the stacking drum of both the spray tubes 6 and 6 is formed in a fan shape, and these tip portions 6T and 6T cover a part of the outer peripheral surface of the stacking drum. Covering in the width direction L.

  As shown in FIGS. 2 to 7, the tip portions 6 </ b> T and 6 </ b> T are shaped so that the top plate portion 61 extends in the stacking drum rotation direction A more than the bottom plate portion 63. An upper scattering plate portion 62 hangs down from the front edge of the top plate portion 61, and the drum outer peripheral surface 62t of the upper scattering plate portion 62 has an uneven shape in which a peak portion and a valley portion are continuous. . The leading edge of the bottom plate portion 63 forms a slight angle with respect to the drum rotation axis, and a lower scattering plate portion 64 is provided upright from the leading edge so as not to reach the top plate portion. The top edge portion 64t of the lower scattering plate portion 64t is formed in a saw blade shape, and the height of the saw blade is formed so as to decrease toward the center of the stacking drum width. Yes.

  When the tip opening 6M having such a shape is used, the polymer P introduced into the spray pipe is transported to the tip 6T by the suction effect of the stacking drum, as indicated by a two-dot chain line in FIG. First, the uppermost stream of the tip 6T tries to jump out from the root position of the wrinkle onto the outer peripheral surface of the stacking drum. At this time, a part of the polymer collides with the tip of the lower plate and rebounds, is moved toward the center of the stacking drum width, and a part of the polymer toward the center of the stacking drum width is discharged toward the outer peripheral surface of the drum. Is done. For this reason, a polymer is uniformly distributed over the stacking drum outer peripheral surface width direction. On the other hand, the polymer P that has jumped out beyond the lower scattering plate portion 64 is attracted to the outer circumferential surface 10S of the stacking drum by the suction effect of the stacking drum. Even if the collision with the lower scattering plate portion 64 is strong and excessively urged and there is a polymer that tends to move upward, it strikes the top plate portion 61 or the upper scattering plate portion 62 and the outer peripheral surface 10S of the fiber stacking drum moves to the trap. Be regulated. In addition, the polymer that is excessively scattered forward is restricted so as to be directed to the drum outer peripheral surface 10 </ b> S due to the collision with the upper scattering plate portion 62. As a result, the polymer P is positioned on the stacking drum outer peripheral surface 10S to such an extent that scattering is not excessive, and thus a uniform polymer layer is formed at a desired position on the stacking drum outer peripheral surface 10S.

  On the other hand, the stacking drum 10 includes absorbent molding recesses 10a, 10a,... At appropriate intervals on the outer peripheral surface. A large number of suction holes 10b, 10b,... Are provided on the bottom surface of the absorber molding recess 10a. A suction means is disposed inside the pile drum 10, and the suction means has a width substantially extending over the pile area of the pile drum 10, and the pulverized pulp 7 and the absorbent body forming recesses 10a, 10a,. In order to pile up the polymer P and convey the absorbent body S formed while adsorbing it, the absorbent body S is transferred to the suction area 10A (reference numeral-) for generating a negative pressure and the conveyor 15 with a vacuum device described later. Therefore, an air supply region 10B (symbol +) that supplies air and generates a positive pressure is disposed so as to be able to be formed.

That is, in FIG. 1, when the absorbent molding recess 10 a of the stacking drum is in α from the absorber stacking start point to the vicinity of the spray pipe, only the pulp 7 is first stacked on the absorbent molding recess 10 a. A pulp layer is formed. Thereafter, when the absorbent molding recess 10a is moved by the rotation of the fiber pile drum 10 and is positioned in the vicinity of the spray pipes 6 and 6, the polymer spray is continuously performed, whereby the polymer layer Y is formed on the pulp layer. ₁ is formed. Further, after passing through the vicinity of the spray pipe, the pulverized pulp 7 is piled again on the upper layer of the polymer layer to form a pulp layer. Thus, a laminated structure of the pulverized pulp layers X and X and the polymer Y as shown in FIG.

  Thus, the pulverized pulp 7 and the polymer P stacked in a laminated state in the absorbent body forming recess 10a of the stacking drum 10 are conveyed in the circumferential direction A (clockwise direction) while being adsorbed and held by suction, When the air supply area 10B is reached, it is transferred to the conveyor 15 with a vacuum device.

  Here, in the suction area 10A of the stacking drum of this embodiment, the two partition walls 11a and 11b are provided on the inner side, and the stacking area width B of the stacking drum 10 is substantially the vertical direction along the flow direction. Three suction sections 12A to 12C are formed in cross section. Each of the suction sections 12A to 12C is provided with suction means such as a compressor capable of adjusting the suction force, and the negative pressure can be adjusted for each of the suction sections 12A to 12C. In this case, the width M of each of the suction sections 12A to 12C is desirably within 200 mm, preferably within 100 mm, so that the negative pressure is not biased. Note that the air supply area 10B is merely for transferring the absorbent body to the conveyor 15 with a vacuum device, and therefore there is no need to partition the inside. In the suction region 10A, if the suction forces Q1 to Q3 of the suction sections 12A to 12C are set to be the same, it is possible to manufacture the absorbent body S having a uniform thickness, and a high-weight and bulky portion at the center. When it is desired to manufacture the absorber having the suction section, the suction force Q2 of the suction section 12B at the center is set higher than the suction forces Q1 and Q3 of the suction sections 12A and 12C on both sides. The number of suction sections is preferably 3 sections, but may be 2 sections or 4 sections.

  The conveyor 15 with the vacuum device that receives the absorbent body S from the pile drum 10 hangs the breathable conveyor belt 18 between the pulleys 16 and 17, arranges the receiving roller 19 at an appropriate place, and also places the breathable conveyor belt 18. It is a conveyor having a structure in which a suction device 20 is disposed at a lower position of the stacking drum 10 sandwiched therebetween. The crepe paper 21 covering the lower surface side of the absorbent body S is supplied to the conveyor 15 with the vacuum device via the guide rollers 22a to 22d, and the absorbent body S is laminated on the crepe paper 21. . The absorber S is conveyed downstream with the crepe paper 21, and then processed into individual absorber units through appropriate steps.

  In the fiber stacking apparatus of the present embodiment described above, the adhesion of the pulverized pulp 7 to the fiber drum outer peripheral surface 10S is not completely hindered when the polymer P is sprayed from the spray pipes 6 and 6. Therefore, the formed absorber S is in a laminated state, but each layer X, X, Y has an appropriate entanglement at the boundary between each layer X, X, Y. Thereby, the absorber S which is difficult to delaminate is formed.

  In addition, when the polymer is sprayed from the spray pipes 6 and 6, if the spray amount (determined by the polymer supply pressure or the supply amount) is set high, a polymer layer P consisting of almost polymer is formed, and the spray amount is reduced. If set low, a polymer layer P having a high mixing ratio of pulverized pulp is formed. Further, if the amount of the polymer sprayed from the pair of tip portions 6T on both sides is made different, the portion corresponding to the spraying ports 6M, 6M with the increased spraying amount has a higher polymer weight per unit area than the portion corresponding to one of the spraying ports. . If necessary, a locally high polymer layer may be formed in this way. In addition, what is necessary is just to determine suitably the polymer supply pressure at the time of polymer dispersion | spreading, and a polymer supply amount, considering the distance of a drum outer peripheral surface and a spraying opening. The specific distance (shortest distance) between the spraying port 6M and the stacking drum outer peripheral surface 10S can be determined as appropriate as long as a polymer layer can be formed on the stacking drum outer peripheral surface. If the distance is increased within the range in which such a layer can be formed, the mixing degree of the polymer P discharged from the spray port and the pulverized pulp 7 is increased, and as shown in FIG. When the layer Y2 is formed and the distance is reduced, the polymer P discharged from the spouts 6M and 6M and the pulverized pulp 7 are mixed with a low polymer density and a thin polymer layer.

  In addition, considering the desired polymer density, the weight of the pulverized pulp, the flow rate of the airflow in the chamber, etc., the distance between the outer periphery of the pile drum and the spray port, the polymer supply amount, the polymer supply pressure, etc. What is necessary is just to determine suitably in the range which can laminate | stack a pulp and a polymer. Further, the extension of the top plate portion, the length of the upper scattering plate portion, the height of the lower scattering plate portion, and the like can be appropriately designed according to the type of polymer used.

  In the above-described embodiment, only the distal end portions 6T and 6T of the spray tube are inserted into the chamber and positioned near the outer peripheral surface of the drum. However, as shown in FIG. An upstream conduit other than 6T may be located in the chamber. The insertion form of the spray tubes 6 and 6 in the chamber C can be appropriately designed in a manner that does not hinder the flow of the pulverized pulp 7 in the chamber C.

<Other embodiments>
Next, a second embodiment of the present invention will be shown. In the form shown in FIG. 10, the spreading pipes 6 and 6 can be moved back and forth, right and left or up and down by moving means (not shown) so that the spout 6M faces the outer circumferential surface 10S of the stacking drum. This is a mode in which the position and distance of the spray port with respect to the drum outer peripheral surface 10S can be changed. In the second embodiment, the thickness of the pulp layer, the thickness of the polymer layer, etc. can be adjusted in detail. It becomes possible to manufacture the absorber according to each use more simply. For example, when the spray pipe 6 is fixed at a position 6X in FIG. 10 and the polymer is sprayed, the pulp layer X _B formed on the side of the stacking drum outer peripheral surface 10S as shown in FIG. When the polymer layer Y ₃ becomes a laminated structure in which the vicinity of the outer peripheral surface 10S of the stacking drum is offset from the outer side and the polymer tube is sprayed by fixing the spray tube 6 at the position 6Y on the contrary, as shown in FIG. Do, with the pulp layer X _B is increased to be formed on the side closer to the product fiber drum outer peripheral surface 10S, the pulp layer X _a far Nogawa from the product fiber drum outer peripheral surface 10S is thinned, from the product fiber outer peripheral surface of the drum A laminated structure in which the polymer layer Y ₃ is offset at a far position is formed.

  Next, a third embodiment of the present invention will be shown. In the fiber stacking apparatus of the first form, the spray tubes 6 and 6 are provided in a pair, a total of two, in the width direction L of the fiber stacking drum, but the third form is as shown in FIG. In this example, two spray tubes 6A and 6B are provided so as to have an upstream and downstream relationship in the flow direction of the pulverized pulp 7. By arranging a plurality of polymers in this way, different types of polymers P and P ′ are appropriately dispersed from the upstream and downstream spraying ports to appropriately polymer layer Y3 made of polymer P as shown in FIG. And a laminated structure in which a polymer layer Y4 made of a different polymer P ′ and a pulp layer X3... Are laminated.

  As shown in the above first to third embodiments, according to the fiber stacking apparatus of the present invention, it is possible to form an absorbent body in a laminated state without fear of delamination by a simple operation. Also, even if functional powder such as deodorant, antibacterial, and indicator is sprayed together with the polymer or separately from the polymer, the laminated absorbent body having each function without delamination can be easily operated. It is possible to form.

  INDUSTRIAL APPLICATION This invention can be utilized for the apparatus which provides an absorber with respect to sheet-like objects, such as a nonwoven fabric, Especially suitably, For shape | molding the absorber used for absorbent articles, such as a paper diaper, a sanitary napkin, and a wipe It can be used for fiber stacking equipment.

It is the schematic of the absorber manufacturing apparatus which concerns on 1st Embodiment. It is a top view of a pile drum and its vicinity. It is a perspective view of a pile drum and its vicinity. It is an enlarged front view of a spraying port periphery. It is the VV sectional view. It is a cross-sectional schematic diagram of a stacking drum and a spray pipe. It is a figure which shows the 1st fiber structure example of a polymer layer and a pulp layer. It is a figure which shows the 2nd fiber stacking example of a polymer layer and a pulp layer. It is the cross-sectional schematic of the other example of a pile drum and a spreading tube. It is the schematic of the absorber manufacturing apparatus which concerns on 2nd Embodiment. It is a figure which shows the 3rd fiber structure example of a polymer layer and a pulp layer. It is a figure which shows the 4th fiber structure example of a polymer layer and a pulp layer. It is the schematic of the absorber manufacturing apparatus which concerns on 3rd Embodiment. It is a figure which shows the 5th fiber structure example of a polymer layer and a pulp layer. It is the schematic of the conventional absorber manufacturing apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Absorber manufacturing apparatus, 2 ... Pulp raw fabric, 3 ... Pulp base paper, 5 ... Defibration apparatus, 6 ... Polymer inlet, 8 ... Ground pulp supply casing, 9 ... Stacking apparatus, 10 ... Rotary drum for stacking DESCRIPTION OF SYMBOLS 10a ... Absorber shaping | molding recessed part, 10b ... Suction hole, 11 ... Suction / air supply chamber, 11A ... Suction chamber area | region, 11B ... Air supply chamber area | region, 12A-12C ... Suction chamber, 13 ... Transfer drum, 15 ... Vacuum Conveyor with device, 21 ... Crepe paper.

Claims (7)

By sucking from the inner surface of the stacking drum, the pulp supplied into the chamber is carried on an air stream and conveyed, and the absorbent body manufacturing apparatus forms the absorber by stacking the outer periphery of the stacking drum. There,
A spray tube for spraying at least one of an absorbent material and functional powder different from the pulverized pulp is provided, and the spray port located at the tip of the spray tube is close to the outer peripheral surface of the pile drum. An absorbent body manufacturing apparatus is provided, wherein the absorbent material is sprayed from the spray port toward the outer peripheral surface of the fiber stacking drum.   The manufacturing apparatus of the absorber according to claim 1, wherein the tip of the spray tube is formed in a fan shape, and the fan-shaped tip portion is disposed so as to cover a part of the outer peripheral surface of the drum.   The absorber manufacturing apparatus according to claim 1, comprising a plurality of spraying tubes.   The manufacturing apparatus of the absorber of any one of Claim 1 to 3 with which the some spreading | diffusion pipe is arranged in parallel by the fiber pile drum rotation direction.   The manufacturing apparatus of the absorber of any one of Claims 1-4 in which the some spreading tube is arranged in parallel by the fiber pile drum width direction.   The absorbent body manufacturing apparatus according to any one of claims 1 to 5, wherein the spray pipe is movable while maintaining a state in which the spray port faces the drum outer peripheral surface.   The inner surface side of the stacking drum is partitioned, and suction means for sucking at least one of pulverized pulp and another absorbent material and functional powder is provided for each section. The manufacturing apparatus of the absorber as described in a term.

Images