JP2002178429A - Method for manufacturing granule deposit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a granule deposit by which the deposition of the granule at a part where the granule need not be deposited or the movement of the granule to such a part is inhibited and the granule deposit whose profile is ultra-sharp in a part where the granule deposits can be stably manufactured, while the wasteful consumption of the granule is prevented from occurring. SOLUTION: The granule 2 is scattered, in a specified scattering pattern, over a first sheet 3 which is continuously conveyed, by means of a scattering device 1 and thereby, the first sheet 3 and the granule deposit having the granule 2 are obtained. In this method for manufacturing the granule deposit, the step to supply a second sheet 5 to the surface of the first sheet 3 after scattering the granule 2 and combine both sheets 3 and 5 and the step to scatter a setting agent for checking the movement of the granule 2 over the first sheet 3 before scattering the granule 2 and/or the face 51, for combining with the first sheet 3, of the second sheet 5 before combining with the first sheet 3 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of preventing the accumulation and movement of particles in a portion that does not need to be deposited, thereby preventing the waste of the particles while preventing the contour of the portion where the particles are accumulated. The present invention relates to a method for manufacturing a granular material deposit that can stably produce a clear granular material deposit.

[0002]

2. Description of the Related Art As a conventional technique for spraying a granular material on a continuously conveyed sheet in a predetermined spray pattern, a method described in JP-A-4-341368 is known. There is. According to this method, it is possible to intermittently disperse the granular material by sucking a part of the continuous flow of the granular material supplied from the so-called powder feeder (screw feeder) with a vacuum. However, in the method described in the publication, since the dispersed particles are not stably held on the sheet, the particles do not need to be originally deposited due to the rebound of the particles during the dispersion or the vibration during the sheet conveyance. Accumulation and movement of the granular material to the portion causes waste of the granular material, and the contour of the portion where the granular material is deposited 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, to prevent waste of the granular material, and to reduce the contour of the portion where the granular material is deposited. It is an object of the present invention to provide a method for producing a granular material deposit that can stably produce a clear granular material deposit.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a powdery or granular material is sprayed on a first sheet which is continuously conveyed by a spraying device in a predetermined spraying pattern. Supplying a second sheet on the first sheet after the application of the granular material and bonding the second sheet to the first method, the method comprising the steps of: Previous first
On the surface of the second sheet before bonding on the first sheet and / or on the first sheet,
The above object has been achieved by providing a method for producing a granular material deposit, comprising: a step of spraying a fixing agent for inhibiting the granular material movement.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on a preferred embodiment. FIG. 1 is a diagram schematically showing an apparatus for producing a granular material deposit which is preferably used for carrying out the method for producing a granular material deposit of the present invention.
The apparatus for distributing powders and granules, 2 is the powders and granules, 3 is the first sheet on which the powders and granules are deposited, 4 is a vacuum conveyor for continuously transporting the first sheets, and 5 is the second sheet.

[0006] As shown in FIGS. 1 and 2, the powdery and granular material spraying apparatus 1 has a powdery and granular material supply port 12 and a spraying port 13 (see FIG. 1) which opens downward. A cylindrical casing (first cylindrical body) 15 disposed substantially horizontally;
A cylindrical rotor (second cylinder) having a rectangular recess 17 on the outer peripheral surface 16 and having the same axis as the casing 15 and rotatably disposed around the axis in the casing 15. ) And supply means 19 for supplying the granular material to the outer peripheral surface 16 of the rotor 18 through the supply port 12.

The supply port 12 and the spray port 1 of the casing 15
3 are provided at positions facing each other on the peripheral wall portion 14 of the casing 15, and the spraying port 13 is provided so as to be located 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 for releasing the granular material 2 from the outer peripheral surface of the rotor 18) and a concave portion of the rotor 18. The spray pattern of the granular material 2 is determined by the shape of 17. As shown in FIG. 2, the casing 15 is supported by a hollow support 15 a at a back surface portion, and a rotating shaft (not shown) of the rotor 18 is disposed in the support 15 a.

The recess 17 of the rotor 18 is
Are formed at two positions at diagonal positions on the outer peripheral surface 16, and a plurality of ridges (projections) 17 a (see FIG. 3) extending in the longitudinal direction of the rotor 18 and having a triangular cross section are formed in each of the concave portions 17. . A rectangular opening 18a in a plan view is formed in a peripheral wall portion of the rotor 18 and a portion located between the concave portions 17, and a portion of the powder or granular material supplied from the supply unit 9 ( The non-sprayed particles are dropped through the opening 18 a without being held in the recess 17. In the rotor 18, a collection hood (collector) 20 for collecting the powders and granules falling from the opening 18a.
Are arranged. And the opening 18 of the rotor 18
When “a” reaches below the supply port 12 of the casing 15, the non-sprayed particles fall into the collection hood 20 and are collected.

When the dusting apparatus 1 is operated, the powder 2 is supplied by the supply means 19 through the supply port 12 onto the outer peripheral surface of the rotor 18 (more specifically, in the recess 17). The powder 2 thus obtained is conveyed to the spray port 13 by the rotation of the rotor 18, and the first sheet 3 continuously conveyed from the spray port 13 to below the spray port 13.
It is sprayed on a predetermined spray pattern (intermittent rectangular spray). The supply means 9 includes a funnel 90 for storing a predetermined amount of the granular material, a screw auger 91 for measuring and sending out the granular material, a scatter disk 92 for expanding a scatter width of the granular material, It is composed of a scattering prevention cylinder 93 for determining the scattering of the powder and the scattering width. The details of the powder and granular material spraying apparatus 1 used in the present embodiment are described in JP-A-8-215629.

In the method of manufacturing a granular material stack according to the present embodiment, as shown in FIG. 1, the above-described granular material spraying device 1 is disposed above the vacuum conveyor 4, and And the first sheet 3
It feeds from 0. Then, as shown in FIG. 1, the first conveyed continuously on the vacuum conveyor 4
The powder 2 is sprayed on the sheet 3 in a predetermined pattern by the spraying apparatus 1. The peripheral speed of the outer peripheral surface of the second cylindrical body 18 is set to the same speed as the conveying speed of the first sheet 3, and the granular material 2 is sprayed quantitatively from the outer peripheral surface of the first cylindrical body 18. Thus, the supply amount of the granular material to the supply port 12 by the supply means 9 is controlled.

In the method for manufacturing a granular material deposit according to the present embodiment, the second sheet 5 is supplied and bonded to the first sheet 3 after the granular material has been scattered. The second sheet 5 is fed from the raw roll 50 using a known feeding mechanism, conveyed by a known conveying mechanism, and supplied onto the first sheet 3.

Further, the surface of the first sheet 3 before the powdery body is sprayed and the surface of the second sheet 5 before the first sheet 3 is bonded to the first sheet 3 (the first sheet 3) Is sprayed on the surface to be adhered to the fixing agent). Specifically, fixing agent spraying devices 6A and 6B are arranged on the upstream side and the downstream side of the granular material spraying position in the flow direction of the first sheet 3, respectively, and are arranged on the upstream side of the granular material spraying position. The first fixing agent spraying device 6A sprays the first fixing agent on the first sheet 3 before the granular material is sprayed, and the second fixing agent disposed downstream of the granular material spraying position. The second fixing agent is sprayed on one surface 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 the movement of the granular material is
In order to improve the fixability of the granular material to the first sheet 3 and / or the second sheet 5 and to exhibit the fixability to the granular material at the time of spraying, or in a subsequent 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 different types. . Examples of the fixing agent sprayed on the first sheet 3 include water, a liquid adhesive,
Examples of the liquid adhesive include polyvinyl acetate, PVA (polyvinyl alcohol), cellulose derivatives, aqueous adhesives such as starch aqueous solution, acrylic acid, acrylic acid ester, EVA, and the like.
Emulsion adhesives such as SBR, NBR, urethane, etc.
Examples thereof include a solvent-based adhesive, a water-dispersed adhesive, and a wax compound. Further, as the powder and the granular adhesive, polyester, polyamide, polyolefin, E
Examples thereof include a VA-based resin and a wax compound.

As the fixing agent to be sprayed on the second sheet 5, various known adhesives can be used, and aqueous adhesives such as polyvinyl acetate, PVA (polyvinyl alcohol), cellulose derivatives, and starch aqueous solution can be used. And emulsion-based adhesives such as acrylic acid, acrylic acid ester, EVA, SBR, NBR, and urethane, solvent-based adhesives, water-dispersed adhesives, and wax compounds.
As the fixing agent to be spread on the first and second sheets 3 and 5, for example, a hot-melt adhesive can be preferably used.

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 attached to each of the sheets. For example, the method for spraying the fixing agent using a device such as a spray gun or a roll coater may be used. , Spiral, strip,
Spraying can be performed in the form of stripes, strings, dots or films, and can also be performed by using various known devices such as a fixed amount cutting and spraying of granular materials using a screw feeder. The application of the fixing agent may be continuous or intermittent with respect to the first and second sheets 3 and 5.

According to the method for manufacturing a powder-particle deposit of the present embodiment, the powder-particles 2 are sprayed on the first sheet 3 by the spraying device 1 in a predetermined spray pattern. And supplying and bonding the second sheet 5 after the granular material is sprayed, and the second sheet before and / or before bonding to the first sheet 3 before the granular material is sprayed. 5 is sprayed with the fixing agent for preventing the movement of the granular material, so that the scattering or movement of the granular material due to the rebound of the granular material 2 during the spraying or the vibration during the sheet conveyance can be prevented, and the predetermined spraying pattern can be prevented. Can be stably held on the sheet or in the sheet without breaking the spray pattern. This makes it possible to maximize the potential spraying pattern forming ability of the spraying apparatus 1 which could not be fully utilized in the past, and to apply the powder 2 to a portion where the powder 2 does not need to be deposited. Can eliminate waste of the granular material, and can make the outline of the portion where the granular material is deposited extremely sharp.

In the present invention, "spraying in a predetermined spraying pattern" means that the scattered powder is sucked into a suction unit formed in a predetermined shape, and a powder accumulation unit (powder or granule) having a predetermined shape is sucked. Particles are primarily deposited in a rotatable cylindrical rotor pocket having pockets (grooves, holes, dents, etc.) corresponding to a predetermined shape, and a roller is formed. Spraying the powder and granules on the sheet by rotation means that the powder and granules are sprayed using a spraying device that can form a predetermined spray pattern by itself.

In the present invention, as described above, the second sheet 5 is stuck on the first sheet 3 after the granular material has been scattered, but the second sheet 5 is stuck on the first sheet 3. As shown in FIG. 3, the bonding is preferably performed immediately after the powder 2 is sprayed. Specifically, as shown in FIG. 3, a lamination position P where the second sheet 5 is laminated on the first sheet 3 and a deposition position where the granular material 2 starts to be deposited on the first sheet 3 Start position (when the powder 2 is the first sheet 3
The horizontal distance L between the upper position and the position Q is greater than 0 mm 5
0 mm or less, preferably more than 0 mm and 30 m
m or less is more preferable. The horizontal distance L between the bonding position P and the deposition start position Q is set in such a range, and immediately after the powder 2 is sprayed, the deposition surface of the powder (the surface on which the powder is sprayed) is changed. By being covered with the second sheet 5, the scattered powder 2 collides with the first sheet 3 and rebounds, so that the powder 2 is scattered, and the powder 2 moves due to vibration during sheet conveyance. Can be effectively suppressed, thereby further reducing waste of the granular material, and further, the contour of the portion where the granular material is deposited can be further sharpened. Such an effect is particularly remarkable when the transport speed of the first sheet 3 is high, for example, 100 m / min or more.

In the present invention, the granules to be sprayed on the first sheet are not particularly limited, but the present invention is applied to the production of absorbent articles for absorbent articles such as disposable diapers and sanitary napkins. In this case, a water-absorbing powder or the like made of a superabsorbent polymer having a particle size of about 10 to 750 μm, which constitutes the absorber, is preferably used.

In the present invention, the first sheet that is continuously conveyed is not particularly limited, but the present invention is applicable to the production of absorbent articles for absorbent articles such as disposable diapers and sanitary napkins. When applied, a bulky sheet, water-absorbent paper, ground pulp laminated sheet, P
E film sheets and the like are preferably used. The bulky sheet is a sheet that can hold all or a part of the powder or granules scattered on the bulky sheet in the sheet. When such a bulky sheet is used, scattering or movement of the scattered powder or granules is performed. Can be further prevented, and a thin and highly absorbent body can be manufactured by combining with a water-absorbing powder.
As the bulky sheet 1, a sheet made of a fibrous material such as a nonwoven fabric, paper, or cloth that can hold the powder in the gap between the fibers is preferable, and a sheet that can be held in a state where the powder is dispersed in the thickness direction of the powder is used. More preferred. When a nonwoven fabric is used as the bulky sheet, an air-through nonwoven fabric, an airlaid nonwoven fabric, a chemical bonded nonwoven fabric, a spunlace nonwoven fabric, or the like can be used as the nonwoven fabric.

Further, in the present invention, the second sheet 5 to be bonded to the first sheet 3 can cover the accumulation surface (the surface on which the particles are dispersed) 31 of the particles in the first sheet 3. Although it is not particularly limited as long as it is applied, when the present invention is applied to the production of an absorbent for absorbent articles such as sanitary napkins, sanitary napkins, etc., constituting the absorbent, water-absorbing paper, Nonwoven fabrics, film sheets, cloths and the like are preferably used. As the second sheet, a bulky sheet similar to the first sheet can be used.
At an appropriate stage after laminating the sheets, the second
It is preferable to stack another sheet on the sheet.

In the method for manufacturing a particulate matter deposit according to the present embodiment, as shown in FIG. 1, the side opposite to the surface on which the particulates 2 are dispersed in the first sheet 3 before the particulates are dispersed. Is supplied with the third sheet 7 fed from the material roll 70 to cover the back side of the first sheet 3. The third sheet 7 is a sheet for preventing the granular material 2 from penetrating to the back surface side when the granular material 2 spread on the first sheet 3 easily penetrates the sheet 3. In the embodiment, the first and second sheets 3 and 5 are sheets that constitute the granular material stack R. As the third sheet 7 when the present invention is applied to the manufacture of an absorbent for absorbent articles such as disposable diapers and sanitary napkins, examples of the third sheet 7 include water-absorbing paper, nonwoven fabric, film sheet, cloth, and the like, which constitute the absorbent. It is preferably used. The third sheet 7 in the present embodiment includes the first sheet
Adhesive bonding device 71 before being bonded to sheet 3 of
The first sheet 3 and the third sheet 7 are supplied onto the vacuum conveyor 4 in a state of being laminated and integrated.

In the method of manufacturing a powdery or granular material according to the present embodiment, when the powdery or granular material 2 is sprayed on the first sheet 3, the first and second suction devices 42 provided on the vacuum conveyor 4 are used. Of the back side of the sheet 3 of FIG. By spraying the granular material 2 while sucking the back surface of the first sheet 3, the fixability of the granular material 2 to the first sheet 3 is improved.

FIG. 4 is a view showing an absorber continuum as an example of the powder / particle deposit R obtained by the method for manufacturing a powder / particle deposit of the present embodiment. R
Is a bulky sheet 3 made of a nonwoven fabric as a first sheet.
And the water-absorbing powder 2 made of a superabsorbent polymer as a powder and deposited on the bulky sheet 3 and / or in the bulky sheet 3 in a plan view, and the front and back surfaces of the bulky sheet 3 Paper (mount) 5 as second and third sheets to be coated
7, a large number of intermittently formed portions (granule accumulation portions) S on which the granules 2 are deposited are formed at predetermined intervals in the longitudinal direction. Each of the granular material deposition portions S is formed in a rectangular shape, and the outline of each of the granular material deposition portions S is extremely sharp. The absorber continuous body R is cut to a predetermined length by a known cutting device in a later step,
It is used as an absorbent for absorbent articles such as disposable diapers, sanitary napkins and incontinence pads.

The method for producing a granular material deposit of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. For example, the rotor 18 in the spraying apparatus 1 used in the above embodiment has a rectangular recess 17 and an opening 18a in plan view, and the shape of the recess 17 and the opening 18a,
The number of protrusions 17a and recesses 17 in 7 can be arbitrarily selected in accordance with the pattern of the powder and the like. Also,
If the first cylindrical body 15 has an inner peripheral surface capable of holding and transporting the granular material 2 between the first cylindrical body 15 and the outer peripheral surface 16 of the second cylindrical body 18, the outer surface shape is particularly The shape is not limited and can be any shape.

In addition, only one of the surfaces of the first sheet before the application of the granular material and the surface of the second sheet before the application to the first sheet, which is bonded to the first sheet, prevents the movement of the granular material. A fixing agent for use may be sprayed. Further, the third sheet 7 can be omitted.

In the above-described embodiment, the spraying device described in Japanese Patent Application Laid-Open No. 8-215629 was used as a device for spraying the powdery and granular materials. However, the powdery and granular materials can be sprayed in a predetermined spraying pattern. Other devices can also be used.
For example, an apparatus described in JP-A-4-341368 can be used. In the above-described embodiment, the powders 2 are intermittently scattered in the length direction of the first sheet 3, but are continuously scattered to a predetermined width in the length direction of the first sheet 3. You may make it do. In addition, when the powder 2 is intermittently scattered in the lengthwise direction of the first sheet 3, the shape of the powder deposition portion S may be any shape such as a circle, an ellipse, a rhombus, and a triangle in plan view. It can be.

[0028]

According to the method for manufacturing a granular material deposit according to the present invention, the accumulation and movement of the granular material to a portion where it is not necessary to deposit the granular material are suppressed, and the waste of the granular material is prevented. It is possible to stably produce a powder-and-particle deposit in which the outline of the portion where the powder has been deposited is clear.

When the outline of the portion where the granular material is deposited in the granular material deposit is clear, for example, the increase in the cost of the granular material can be prevented by using the amount of the granular material having only the required shape. be able to. When cutting to a predetermined length for application to disposable diapers, napkins and the like, it is possible to prevent spilling of powder and granules from the cut portion. In a detection system such as a phase check of a granular material or a spray shape check in a production process, the accuracy of the detection system can be enhanced, and high-quality 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 a manufacturing apparatus of a granular material deposit preferably used for carrying out a method of manufacturing a granular material deposit of the present invention.

FIG. 2 is a perspective view showing a main part of the apparatus for dispersing the granular material in the manufacturing apparatus shown in FIG.

FIG. 3 is a diagram illustrating a preferable positional relationship between a bonding position where a second sheet is bonded on a first sheet and a deposition start position of a granular material on the first sheet; .

FIG. 4 is a perspective view, partially broken away, showing a particulate matter deposit body (absorbent continuum) obtained in an embodiment of the method for producing a particulate matter deposit body of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spraying apparatus of a granular material 2 Granular material 3 1st sheet 4 Vacuum conveyor 5 2nd sheet 6A, 6B Spraying apparatus of a fixing agent 7 3rd sheet S granular material suction part R granular material stack ( Absorber continuum)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Hirasawa 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Pref. In the Kao Co., Ltd. F-term (reference) 3B029 BA18 BF03 4C098 AA09 CC03 CE10 DD10 4F042 AA02 AB03 BA02 BA05 BA08 BA27 CB11 EC03 4F100 AA01B AJ06 AJ07 AJ11 AK01B AK01C AK04A AK21 AK22 AK25 A10BA10 BA07 AT10 BA10 BAK DG12A DG12C DG15A DG15C GB72 HB40B JD14 JD15A JD15B JD15C JM01

Claims (5)

[Claims] 1. On a first sheet that is continuously conveyed,
In the method for producing a granular material deposit that obtains a granular material deposit having a first sheet and a granular material, the granular material is sprayed by a spraying device in a predetermined spray pattern. A step of supplying and bonding the second sheet on the first sheet, and a step of supplying and / or bonding the first sheet on the first sheet before and / or before bonding to the first sheet. Spraying a fixing agent for preventing the movement of the granular material on the surface to be bonded to the sheet. 2. A first tubular body having a supply port for powder and granules and a spray port opened downward, and a second tubular body rotatably disposed in the first tubular body. And transporting the granular material supplied onto the outer peripheral surface of the second cylindrical body through the supply port to the spraying port by rotating the second cylindrical body, and spraying the powdery granular material from the spraying port. , Using a powder and granule spraying device,
The method for producing a granular material deposit according to claim 1, wherein the granular material is sprayed. 3. The method according to claim 1, wherein the second sheet is adhered to the first sheet immediately after the powder is sprayed.
Or the method for producing a granular material deposit according to 2. 4. A horizontal distance between a laminating position where the second sheet is laminated on the first sheet and a deposition start position of the granular material on the first sheet is zero.
The method for producing a granular material deposit according to any one of claims 1 to 3, which is more than 50 mm and less than 50 mm. 5. The bulky sheet according to claim 1, wherein the first sheet is a bulky sheet capable of holding all or a part of the granular material sprayed on the first sheet in the sheet. The method for producing a granular material deposit.