JP4321961B2 - Method for producing particulate deposit - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is capable of preventing the accumulation and movement of the granular material to a portion that does not need to be deposited, and preventing the waste of the granular material, while the contour of the portion where the granular material is accumulated is clear It is related with the manufacturing method of the granular material deposit body which can be manufactured stably.
[0002]
[Prior art and problems to be solved by the invention]
There is a method described in Japanese Patent Application Laid-Open No. 4-341368 as a conventional technique for spraying powder particles in a predetermined spray pattern on a continuously conveyed sheet.
According to this method, the powder particles can be intermittently dispersed by sucking a part of the continuous flow of the powder particles supplied from a so-called powder feeder (screw feeder) with a vacuum.
However, in the method described in the publication, since the dispersed powder particles are not stably held on the sheet, there is no need to originally deposit due to rebound of the powder particles at the time of dispersion, vibration during sheet conveyance, or the like. When the granular material is accumulated or moved to the portion, there is a problem that the granular material is wasted or the outline of the portion where the granular material is accumulated becomes unclear.
[0003]
Accordingly, an object of the present invention is to suppress the accumulation and movement of the granular material to a portion that does not need to be deposited and prevent the waste of the granular material, while the contour of the portion where the granular material is accumulated is clear. It is an object of the present invention to provide a method for producing a granular material deposit capable of stably producing a granular material deposit.
[0004]
[Means for Solving the Problems]
In the present invention, a granular material is dispersed on a first sheet that is continuously conveyed in a predetermined distribution pattern by a distribution device, and a granular material accumulation body having the first sheet and the granular material is obtained. In the manufacturing method of the obtained granular material deposit body, the process of supplying and bonding the second sheet on the first sheet after the granular material dispersion, the first sheet before the granular material dispersion and / or Or a step of spraying a fixing agent for preventing movement of the granular material on the bonding surface to the first sheet of the second sheet before being bonded to the first sheet. The above object is achieved by providing a method.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on a preferred embodiment thereof.
FIG. 1 is a diagram showing an outline of a production apparatus for a granular material deposit preferably used in the implementation of the method for producing a granular material accumulation according to the present invention. In FIG. 2 is a granular material, 3 is a first sheet on which the granular material is deposited, 4 is a vacuum conveyor for continuously conveying the first sheet, and 5 is a second sheet.
[0006]
As shown in FIGS. 1 and 2, the powder particle spraying device 1 has a powder particle supply port 12 and a spray port 13 (see FIG. 1) that opens downward in the peripheral wall portion 14. A cylindrical casing (first cylindrical body) 15 provided, a concave portion 17 having a rectangular shape in plan view on the outer peripheral surface 16, and the same axis as that of the casing 15 in the casing 15. A configuration provided with a cylindrical rotor (second cylindrical body) 18 disposed so as to be rotatable around an axis, and a supply means 19 for supplying powder particles to the outer peripheral surface 16 of the rotor 18 through the supply port 12. It is said that.
[0007]
The supply port 12 and the spray port 13 of the casing 15 are provided at positions facing each other on the peripheral wall portion 14 of the casing 15, and the spray port 13 is provided to be positioned below.
The spraying port 13 is formed in a rectangular shape in plan view, and has an opening shape of the spraying port 13 (particularly, a shape of an edge that releases the granular material 2 from the outer peripheral surface of the rotor 18) and a concave portion of the rotor 18. According to the shape of 17, the dispersion pattern of the powder body 2 is determined.
As shown in FIG. 2, the casing 15 is supported by a hollow support 15 a at the inner surface, and a rotating shaft body (not shown) of the rotor 18 is disposed in the support 15 a.
[0008]
Two recesses 17 of the rotor 18 are formed at diagonal positions on the outer peripheral surface 16 of the rotor 18. Each of the recesses 17 has a triangular protrusion (protrusion) 17 a extending in the longitudinal direction of the rotor 18 (see FIG. 3) is formed.
A rectangular opening 18a in a plan view is formed in a portion of the peripheral wall portion of the rotor 18 located between the recesses 17, and a part of the granular material supplied from the supply means 9 ( The powder particles that are not dispersed are dropped through the opening 18a without being held in the recess 17. In the rotor 18, a collection hood (collector) 20 that collects powder particles falling from the opening 18 a is disposed. And when the opening part 18a of the rotor 18 reaches the lower part of the supply port 12 of the casing 15, the granular material which is not sprayed falls to the collection | recovery hood 20 and is collect | recovered.
[0009]
When the powder particle dispersion device 1 is operated, the powder material 2 is supplied to the outer peripheral surface of the rotor 18 (more specifically, in the concave portion 17) through the supply port 12 by the supply means 19, and the supplied powder. The granular material 2 is conveyed to the spraying port 13 by the rotation of the rotor 18, and on the first sheet 3 continuously transported from the spraying port 13 below the spraying port 13, a predetermined spraying pattern ( It is spread by rectangular intermittent spray).
The supply means 9 includes a funnel 90 for storing a certain amount of granular material, a screw auger 91 for measuring and delivering the granular material, a spreading disk 92 for widening the spreading width of the granular material, It consists of a scattering prevention cylinder 93 that determines the scattering prevention of the powder and the spreading width.
The details of the granular material spraying apparatus 1 used in this embodiment are described in JP-A-8-215629.
[0010]
In the method for producing a granular material deposit according to the present embodiment, as shown in FIG. 1, the above-described powder particle spraying device 1 is arranged above the vacuum conveyor 4, and the vacuum conveyor 4 is One sheet 3 is fed out from the raw roll 30 and supplied. And as shown in FIG. 1, the powder body 2 is spread | dispersed in the predetermined pattern by the said spreading | diffusion apparatus 1 on the 1st sheet | seat 3 continuously conveyed on the vacuum conveyor 4. As shown in FIG. The second cylindrical body 18 has the peripheral speed of the outer peripheral surface the same as the conveying speed of the first sheet 3, and the granular material 2 is quantitatively dispersed from the outer peripheral surface of the first cylindrical body 18. As described above, the amount of the granular material supplied to the supply port 12 by the supply means 9 is controlled.
[0011]
In the manufacturing method of the granular material deposit of this embodiment, the 2nd sheet | seat 5 is supplied and bonded together on the 1st sheet | seat 3 after granular material distribution. The second sheet 5 is fed from the original roll 50 using a known feeding mechanism, conveyed by a known conveying mechanism, and supplied onto the first sheet 3.
[0012]
In addition, the bonding surface to the first sheet 3 in the second sheet 5 before being bonded to the first sheet 3 and before the first sheet 3 is bonded (bonded to the first sheet 3). The fixing agent for preventing the movement of the granular material is sprayed on the surface.
Specifically, the fixing agent spraying devices 6A and 6B are disposed on the upstream side and the downstream side of the powder particle spray position in the flow direction of the first sheet 3, and are disposed on the upstream side of the powder particle spray position. The first fixative spraying device 6A sprays the first fixative onto the first sheet 3 before spraying the granular material, and the second fixative disposed on the downstream side of the powder spraying position. The second fixing agent is sprayed on one side of the second sheet 5 before being bonded to the first sheet 3 by the spraying device 6B.
[0013]
Here, the fixing agent for preventing movement of the granular material is to improve the fixing property of the granular material to the first sheet 3 and / or the second sheet 5, and is fixed to the granular material at the time of spraying. In the post-dispersion step after spraying, the fixing property to the granular material may be expressed by means such as compression, heating, heat compression, drying and wetting. Further, the first fixing agent sprayed on the first sheet 3 and the second fixing agent sprayed on the second sheet 5 may be of the same type or of different types. . Examples of the fixing agent sprayed on the first sheet 3 include water, liquid adhesive, powder, and granular adhesive. Examples of the liquid adhesive include polyvinyl acetate, PVA (polyvinyl alcohol), and cellulose. Derivatives, aqueous solution adhesives such as starch aqueous solution, emulsion adhesives such as acrylic acid, acrylic ester, EVA, SBR, NBR, urethane, solvent adhesives, water dispersion adhesives, wax compounds, etc. Can do. Examples of the powder and the granular adhesive include polyester, polyamide, polyolefin, EVA resin, and wax compound.
[0014]
Moreover, as a fixing agent spread | dispersed on the 2nd sheet | seat 5, various well-known adhesives can be used, Aqueous adhesives, such as polyvinyl acetate, PVA (polyvinyl alcohol), a cellulose derivative, starch aqueous solution, acrylic Examples thereof include emulsion adhesives such as acids, acrylic esters, EVA, SBR, NBR, and urethane, solvent adhesives, water dispersion adhesives, and wax compounds.
As a fixing agent sprayed on the first and second sheets 3 and 5, for example, a hot melt adhesive can be preferably used.
[0015]
The method of spraying the fixing agent on the first and second sheets 3 and 5 is not particularly limited as long as the fixing agent can be adhered to the first and second sheets 3 and 5, respectively. For example, using a device such as a spray gun or a roll coater, a mesh or spiral It can be sprayed in the form of strips, stripes, strings, dots or films, and can also be sprayed using various known devices such as quantitative cutout spraying of granular materials using a screw feeder. Further, the spraying of the fixing agent may be continuous or intermittent with respect to the first and second sheets 3 and 5.
[0016]
According to the manufacturing method of the granular material deposit of this embodiment, while spraying the granular material 2 on the 1st sheet | seat 3 with the said spreading | diffusion apparatus 1 by a predetermined | prescribed spreading | diffusion pattern, in this way The second sheet 5 after the body spraying is supplied and bonded, and the powder is applied to the first sheet 3 before the powder particle spraying and / or the second sheet 5 before being bonded to the first sheet 3. Since the fixing agent for preventing particle movement is sprayed, the powder particle 2 can be prevented from splashing or moving due to the rebound of the powder 2 or vibration during sheet conveyance at the time of spraying. The powdered granular material can be stably held on the sheet or in the sheet without breaking the spray pattern.
Thereby, it is possible to make the most of the ability to form a potential spray pattern of the spray device 1 that could not be fully utilized in the past, and the powder material 2 in a portion where the powder material 2 does not need to be deposited. It is possible to eliminate waste of the granular material due to the presence of, and to make the contour of the portion where the granular material is deposited extremely sharp (sharp).
[0017]
In the present invention, “spreading with a predetermined spraying pattern” means sucking the dispersed powder particles into a suction portion formed in a predetermined shape and depositing the powder particles in a predetermined shape (the powder particles are deposited). The powder particles are primarily deposited in the pocket portion of a rotatable cylindrical rotor having pockets (grooves, holes, depressions, etc.) corresponding to a predetermined shape, and the sheet is rotated by rotation of the roller. By spraying a granular material on top, it means spraying the granular material by itself using a spraying device that can form a predetermined spray pattern.
[0018]
In the present invention, as described above, the second sheet 5 is bonded onto the first sheet 3 after the powder and particles are dispersed, but the bonding of the second sheet 5 to the first sheet 3 is performed. As shown in FIG. 3, it is preferable to carry out immediately after spraying the granular material 2.
Specifically, as shown in FIG. 3, a bonding position P where the second sheet 5 is bonded onto the first sheet 3, and deposition where the granular material 2 starts to deposit on the first sheet 3. The horizontal distance L from the start position (position where the granular material 2 reaches the first sheet 3) Q is preferably more than 0 mm and 50 mm or less, and more preferably more than 0 mm and 30 mm or less.
The horizontal distance L between the bonding position P and the deposition start position Q is within such a range, and immediately after the powder particles 2 are sprayed, the powder particle deposition surface (the surface on which the powder particles are sprayed) is used. By covering with the second sheet 5, the dispersed granular material 2 collides with the first sheet 3 and bounces back, so that the granular material 2 scatters, vibrates during sheet conveyance, etc. Can be effectively suppressed, whereby the waste of the granular material can be further reduced, and the contour of the portion where the granular material is deposited can be made clearer. Such an effect is particularly remarkable when the conveyance speed of the first sheet 3 is high, for example, when it is 100 m / min or more.
[0019]
In the present invention, the granular material sprayed on the first sheet is not particularly limited, but when the present invention is applied to the manufacture of an absorbent article for absorbent articles such as disposable diapers and sanitary napkins. Is preferably a water-absorbing granular material composed of a highly water-absorbing polymer having a particle size of about 10 to 750 μm, which constitutes the absorber.
[0020]
In the present invention, the first sheet continuously conveyed is not particularly limited, but the present invention is applied to the manufacture of an absorbent body for absorbent articles such as disposable diapers and sanitary napkins. For this, a bulky sheet, a water-absorbent paper, a pulverized pulp laminate sheet, a PE film sheet and the like constituting the absorber are preferably used.
The bulky sheet is a sheet that can hold all or a part of the powder particles dispersed on the bulky sheet in the sheet. When such a bulky sheet is used, the scattered powder particles are scattered or moved. Can be further prevented, and a thin and highly absorbent body can be produced by combining with a water-absorbent powder.
The bulky sheet 1 is preferably a sheet made of a fiber material such as a nonwoven fabric, paper, or cloth that can hold the powder particles in the gaps between the fibers, and can hold the powder particles dispersed in the thickness direction of the powder particles. More preferred. As the nonwoven fabric when a nonwoven fabric is used as the bulky sheet, an air-through nonwoven fabric, an airlaid nonwoven fabric, a chemical bond nonwoven fabric, a spunlace nonwoven fabric, or the like can be used.
[0021]
In the present invention, the second sheet 5 to be bonded to the first sheet 3 can cover the accumulation surface 31 (the surface on which the granular material is dispersed) 31 of the first sheet 3. Although not particularly limited, when the present invention is applied to the production of an absorbent article for absorbent articles such as disposable diapers and sanitary napkins, the absorbent paper, nonwoven fabric, and film constituting the absorbent article Sheets, cloths and the like are preferably used.
As the second sheet, a bulky sheet similar to the first sheet can be used. In that case, another sheet is placed on the second sheet at an appropriate stage after the second sheet is laminated. It is preferable to laminate.
[0022]
In the method for producing a granular material deposit according to the present embodiment, as shown in FIG. 1, on the surface opposite to the surface on which the granular material 2 is dispersed in the first sheet 3 before the granular material is dispersed. Then, the third sheet 7 fed out from the original roll 70 is supplied to cover the back side of the first sheet 3.
The 3rd sheet | seat 7 is a sheet | seat which prevents the penetration to the back surface side of this granular material 2, when the granular material 2 spread on the 1st sheet | seat 3 is easy to penetrate the sheet | seat 3, This book In the embodiment, the first and second sheets 3 and 5 constitute the granular material deposit R.
As the third sheet 7 in the case where the present invention is applied to the production of absorbent articles for absorbent articles such as paper diapers and sanitary napkins, water-absorbent paper, nonwoven fabric, film sheets, cloth, etc. constituting the absorbent body are used. Preferably used. Before the first sheet 3 is bonded to the third sheet 7 in the present embodiment, a hot-melt adhesive is sprayed by the adhesive spraying device 71, and the first sheet 3 and the third sheet are dispersed. 7 is supplied on the vacuum conveyor 4 in a state of being laminated and integrated.
[0023]
In addition, in the manufacturing method of the granular material deposit body of this embodiment, when spraying the granular material 2 on the 1st sheet | seat 3, the 1st sheet | seat 3 is attracted | sucked by the suction device 42 which the vacuum conveyor 4 comprises. The back side is sucked. By fixing the granular material 2 while sucking the back surface side of the first sheet 3, the fixability of the granular material 2 to the first sheet 3 is improved.
[0024]
FIG. 4 is a view showing an absorbent body continuum as an example of the granular body deposited body R obtained by the method for producing a granular body deposited body of the present embodiment, and the absorbent body continuous body R shown in FIG. Bulky sheet 3 made of non-woven fabric as the first sheet, and water-absorbing powder comprising superabsorbent polymer as a granular material deposited in a rectangular shape in plan view on and / or in bulky sheet 3 Part (powder accumulation part) S which consists of the granule 2 and the paper (mounting paper) 5 and 7 as the 2nd and 3rd sheet | seat which coat | covers the front and back of the bulky sheet 3 However, a large number are intermittently formed at predetermined intervals along the longitudinal direction. Each granular material accumulation part S is formed in a rectangular shape, and the outline of each granular material accumulation part S is extremely clear (sharp).
The absorbent continuous body R is cut into a predetermined length by a known cutting device in a later step, and is used as an absorbent body for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads.
[0025]
The manufacturing method of the granular material deposit of this invention is not restrict | limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably.
For example, the rotor 18 in the spraying device 1 used in the above embodiment has a rectangular recess 17 and an opening 18a in plan view. The shape of the recess 17 and the opening 18a, The number of the projections 17a and the recesses 17 can be arbitrarily selected according to the dispersion pattern of the granular material. Moreover, if the 1st cylindrical body 15 has an internal peripheral surface which can hold | maintain and convey the powder body 2 between the outer peripheral surfaces 16 of the 2nd cylindrical body 18, the outer surface shape will be sufficient as it. Is not particularly limited, and can have any shape.
[0026]
In addition, fixing for preventing the movement of the granular material on only one of the bonding surfaces of the second sheet before being bonded to the first sheet and the first sheet before being sprayed with the granular material to the first sheet. An agent may be sprayed. Further, the third sheet 7 can be omitted.
[0027]
Moreover, in the said embodiment, although the spreading | diffusion apparatus of Unexamined-Japanese-Patent No. 8-215629 was used as an apparatus to which a granular material is disperse | distributed, the other thing which can disperse a granular material with a predetermined | prescribed distribution pattern An apparatus can also be used. For example, an apparatus described in JP-A-4-341368 can be used.
Moreover, in the said embodiment, although the granular material 2 was intermittently spread | dispersed in the length direction of the 1st sheet | seat 3, it is continuously spread | diffused by the predetermined width in the length direction of the 1st sheet | seat 3. You may make it let it. Moreover, the shape of the granular material accumulation | storage part S in the case of intermittently spraying the granular material 2 in the length direction of the 1st sheet | seat 3 is arbitrary shapes, such as circular, an ellipse, a rhombus, a triangle, planar view It can be.
[0028]
【The invention's effect】
According to the method for producing a granular material deposit of the present invention, the granular material is deposited while suppressing the accumulation and movement of the granular material to a portion that does not need to be deposited and preventing waste of the granular material. It is possible to stably produce a granular material deposit having a clear contour.
[0029]
When the outline of the part where the granular material is deposited in the granular material deposit is clear, for example,
(1) The powder material cost can be prevented from increasing by using the amount of the powder material having only the required shape.
(2) When cutting into a predetermined length for application to disposable diapers, napkins, etc., it is possible to prevent spillage of powder from the cut portion.
(3) In the detection system for confirming the phase of the powder particles and the confirmation of the sprayed shape in the production process, the accuracy of the detection system can be increased, and high-quality and high-speed production can be stabilized.
There are advantages such as.
[Brief description of the drawings]
FIG. 1 is a schematic view schematically showing an example of an apparatus for producing a granular material deposit preferably used in the implementation of the method for producing a granular material deposit according to the present invention.
FIG. 2 is a perspective view showing a part of the main part of the powder particle dispersion device in the manufacturing apparatus of FIG.
FIG. 3 is a diagram illustrating a preferred positional relationship between a bonding position where a second sheet is bonded onto the first sheet and a deposition start position of the granular material on the first sheet. .
FIG. 4 is a perspective view showing a partially broken powder deposit (absorber continuum) obtained in an embodiment of the method for producing a powder deposit according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Powder distribution apparatus 2 Powder body 3 First sheet 4 Vacuum conveyor 5 Second sheets 6A and 6B Fixing agent distribution apparatus 7 Third sheet S Powder body suction part R Powder body deposit ( Absorber continuum)

Claims (5)

On the first sheet that is continuously conveyed, the granular material is sprayed in a predetermined spraying pattern by a spraying device to obtain a granular material deposit having the first sheet and the granular material. In the method for producing a deposit,
A spraying step of spraying the granular material on the first sheet by the spraying device;
A laminating step of supplying and bonding the second sheet on the first sheet after the powder particle dispersion ,
The fixing agent for preventing particle movement is sprayed on the first sheet before the powder and / or the second sheet before being bonded to the first sheet. and comprising the step of,
The conveying speed of the first sheet in the spraying step and the bonding step is 100 m / min or more. In the bonding step, the bonding position P and the second position where the second sheet is bonded onto the first sheet. The horizontal distance L from the deposition start position Q where the granular material starts to accumulate on the first sheet is set to be greater than 0 mm and equal to or smaller than 50 mm, and the second sheet is placed on the first sheet immediately after the granular material is dispersed. The manufacturing method of the granular material deposit | attachment body bonded together .   A first cylindrical body having a supply port for powder particles and a spout opening that opens downward; and a second cylindrical body rotatably disposed in the first cylindrical body, The granular material supplied onto the outer peripheral surface of the second cylindrical body through the supply port is conveyed to the spraying port by the rotation of the second cylindrical body and sprayed from the spraying port. The manufacturing method of the granular material deposit body of Claim 1 which spreads the said granular material using a dispersion | spreading apparatus. The said 1st sheet | seat is a bulky sheet | seat which can hold | maintain all or one part of the granular material sprayed on this 1st sheet | seat in a sheet | seat, Manufacture of the granular material deposited body of Claim 1 or 2 Method. The manufacturing method of the granular material deposition body in any one of Claims 1-3 which sprays the said granular material after supplying a 3rd sheet | seat to the back surface side of a 1st sheet | seat. The manufacturing method of the granular material deposit body in any one of Claims 1-4 which disperse | distribute the said granular material, performing suction from the back surface side of a 1st sheet | seat.

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