JPH08215630A - Method and apparatus for scattering powder - Google Patents

Abstract

PURPOSE: To eliminate the effect of centrifugal force on a timing belt, to control powder flying off, and to stabilize scattering by rotating the timing belt in the longitudinal direction and scattering powder in a specified pattern over a transferred article by dropping the powder from above a spray section. CONSTITUTION: When a scatterer 1 is used, powder is first supplied to a funnel 50 from a supply hopper 8. Next, a drive means 4 is actuated, and a timing belt 2 wound onto a winding means 3 is rotated continuously. Next, a transferred article S is moved at an equal speed to that of the timing belt, a screw auger 51 is rotated, and the powder, after being introduced on a spreading disk 52 and spread, is dropped along the inner surface of a scattering cylinder 53. In this way, the powder is dropped from above a scattering section A to form a scattering pattern on the article S, while unscattered powder is transferred upward through a transfer section B. A vibrator 61 is then operated to recover the powder in a recovery hopper 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for spraying powder particles on a moving object in a predetermined spray pattern, and more particularly to absorbent articles such as sanitary napkins and disposable diapers. The present invention relates to a dusting method and apparatus suitable for use in producing an absorbent body to be used.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 4-34 discloses a conventional technique for spraying powder particles on a moving object in a predetermined spray pattern.
A technique described in Japanese Patent No. 1368 (hereinafter referred to as Conventional Technique 1) and a technique described in Japanese Patent Laid-Open No. 3-249974 (hereinafter referred to as Conventional Technique 2) have been proposed.

The above-mentioned prior art 1 is a method of intermittently spraying powder particles by sucking a part of a continuous flow of powder particles supplied from a so-called powder feeder (screw feeder) with a vacuum. is there. In addition, the above-mentioned conventional technique 2
Is a disk having a pattern-shaped opening below the powder feeder, the disk surface is arranged perpendicular to the continuous flow of powder and granular material, and the disk is intermittently rotated by rotating the disk. It is a method of spraying.

[0004]

By the way, in the above-mentioned method, since the powder particles are intermittently dispersed by vacuum suction, it is difficult to form a predetermined edge on the scattered particles. There is a problem in that the contour of the spray pattern becomes very unclear and powder particles that could not be sucked remain in the unnecessary parts of the spray pattern, so that a complete spray pattern cannot be obtained. In addition, since the powder particles are intermittently dispersed by vacuum suction as described above, it is not possible to obtain a spray pattern having an arbitrary shape (for example, a circular shape, an elliptical shape, a triangular shape, etc.). Furthermore,
Shortening the intermittent cycle (increasing the moving speed of the conveyed object) causes a delay in turning on / off the vacuum suction, and as a result, the spraying phase and spraying length change depending on the length of the cycle (increase / decrease in speed). There was a problem that a stable spray pattern could not be formed. Furthermore, in order to collect and reuse the powder and granules sucked by the vacuum suction, a so-called cyclone system, a bag filter system or the like separating means for air and powder granules is used. However, the powder and granules of about several microns (50 microns or less) are clogged with the filter or cannot be separated, and the recovery efficiency of the powder and granules is low, and there is a problem in stable operation. Moreover, since such a separating means is used,
The device was large and complicated, and maintenance was not easy.

Further, in the above-mentioned prior art 2, since a continuous flow of powdery particles is blown in the rotational direction of the disk at the end of the opening, the powdery particles are scattered to a portion where spraying is unnecessary, There is a problem that a stable spray pattern cannot be formed, such as a decrease in yield of the sprayed powder and granules. In addition, as a means for collecting the powder particles that have not been sprayed from the spray port and accumulated on the disk, a scraping plate (scrubber) is arranged on the disk, and a recovery tank is arranged below the disk. It is designed to be dropped and collected from a spray port at a position where there is no spray target, but it operates at high speed (for example, 300 to 1000).
At the time of (cycle / minute), a sufficient collection effect was not obtained for the scattering of the powder and granules due to the action of centrifugal force, and there was a limit to the operation at high speed. As a countermeasure for this, it is conceivable to enlarge the disc to reduce the rotation speed, but there is a problem that the device scale becomes large.

The object of the present invention is to reliably suppress the spraying of powder and granules to unnecessary portions even at high speed operation, and to stably form an arbitrary spraying pattern having a sharp contour. An object of the present invention is to provide a method and apparatus for spraying powdery particles, which enables effective use of the particles, has a simple structure, and is easy to maintain.

[0007]

SUMMARY OF THE INVENTION The invention according to claim 1 of the present invention is a method for spraying powder particles on a moving object in a predetermined spray pattern, the method comprising: An endless timing belt having a timing pulley, a conveying section for powder particles to be collected on the inner surface, and a plurality of spraying ports at predetermined intervals in the longitudinal direction, at least the inner surface of the timing belt is directed upward. The substantially horizontal spraying section and the winding section are wound by a winding means so as to form a transport section that is continuous with the spraying section and that is inclined with a rising angle of a predetermined angle with respect to the spraying section, and then is wound. The timing belt is rotated in the longitudinal direction, and the granular material is dropped from above the spraying section, and the granular material is sprayed on the transported object through the spraying port. By providing the spraying method of granular material, characterized in that recovering conveys the granular material is obtained by achieving the above object.

The invention according to claim 2 of the present invention is
The method for spraying powder and granules according to claim 1, wherein the moving speed of the conveyed product and the moving speed of the timing belt are the same speed. is there.

The invention according to claim 3 of the present invention is
As a preferred device for carrying out the method of applying the powder and granules of the present invention, a device for spraying the powder and granules in a predetermined spraying pattern on a moving transported object, wherein a timing pulley is provided on the outer surface. An endless timing belt having a conveying section for the powder and granules to be collected on the inner surface and having a plurality of spraying ports at predetermined intervals in the longitudinal direction, and a substantially horizontal surface with at least the inner surface of the timing belt facing upward. And a winding means for winding the timing belt so as to form a spreading section and a conveying section which is continuous to the spreading section and which is inclined at an ascending slope of a predetermined angle with respect to the spreading section, and winding means around the winding means. The driving means for rotating the rotated timing belt in the longitudinal direction and the provision of the granular material for dropping the granular material from above the spraying section and spraying the granular material on the conveyed product through the spraying port. Means and is intended to provide a spraying apparatus of the granular material, characterized in that it comprises a recovery means for recovering the transported granular material in the transport section of the timing belt.

[0010]

In the dusting method of claim 1 of the present invention, at least a substantially horizontal spraying section in which the inner surface of the timing belt is directed upward and a continuous spraying section with respect to the spraying section. A timing belt wound by a winding means so as to form a conveying section inclined at a climbing gradient of a predetermined angle is rotated in the longitudinal direction, and the granular material is dropped from above the spraying section to pass through the spraying port. By spraying the powder and granules on the conveyed product, the powder and granulated substances are sprayed on the conveyed product in a predetermined spraying pattern. At this time, since the timing belt rotates in the longitudinal direction, centrifugal force does not act even when it is operated at high speed, and scattering of powder and granules can be suppressed. Further, since the powdery or granular material not sprayed through the spraying port is transported and collected by the transporting portion of the timing belt, the powdery or granular material can be effectively used. Further, since the patterning and collecting of the powdery particles are performed by the timing belt, the structure is simple and the maintenance is easy.

In the method for spraying powdery or granular material according to claim 2 of the present invention, the moving speed of the conveyed product and the moving speed of the timing belt are the same, so that the moving speed of the conveyed product is the same. In addition to the effect of the method for spraying the granular material of
The distribution pattern of the powder and granules formed on the conveyed product is formed in substantially the same shape as the distribution opening of the timing belt.

[0012] In the dusting apparatus of claim 3 of the present invention, the timing belt has a substantially horizontal spraying section with at least the inner surface of the timing belt facing upward, and the spraying section is continuous with the spraying section. With respect to the winding means is wound by the winding means so as to form a conveyance section inclined at a rising angle of a predetermined angle, and the timing belt wound around the winding means is rotated in the longitudinal direction by the driving means, By dropping the powder or granules from above the spraying section by the supply means and spraying the powder or granules onto the conveyed product through the spraying port, the powdered or granular bodies are moved in a predetermined distribution pattern on the moving conveyed product. It is scattered. At this time, since the timing belt is rotated in the longitudinal direction, even when operating at high speed,
The centrifugal force does not act and the scattering of powder and granules can be reliably suppressed.
In addition, the granular material that has not been sprayed through the spray port,
Since the timing belt conveys the powder and the collecting unit collects the powder, the powder can be effectively used.
Further, since the patterning and collecting of the powdery particles are performed by the timing belt, the structure is simple and the maintenance is easy.

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of a powder-granule spraying apparatus according to the present invention. In FIG.
Reference numeral 1 is a powder / particle spraying device (hereinafter, simply “spraying device”).
, P is a powder or granular material, and S is a moving object.

As shown in FIG. 1, the spraying device 1 is
It has a timing pulley 20 (see FIG. 2) on the outer surface and also has a conveying section 21 (see FIG. 2) for collecting powder particles on the inner surface.
And a plurality of spray ports 2 having a predetermined interval in the longitudinal direction
Endless timing belt 2 having two (see FIG. 2)
And at least the inner surface of the timing belt 2 is directed upward to form a substantially horizontal spraying section A and a transporting section B which is continuous with the spraying section A and which is inclined with respect to the spraying section A at an ascending slope of a predetermined angle. The winding means 3 for winding the timing belt 2, the driving means 4 for rotating the timing belt 2 wound around the winding means 3 in the longitudinal direction, and the spray section A
The granular material supply means 5 for dropping the granular material from above the upper part and spraying the granular material on the conveyed material S through the sprinkling port 22.
And a collecting means 6 for collecting the powder or granular material conveyed by the conveying portion 21 of the timing belt 2.

As shown in FIG. 2, the timing belt 2 is formed by molding and processing a rubber material such as neoprene, urethane, etc., so that the spray port 22 can be easily processed into a desired shape. is there.

The sprinkling port 22 of the timing belt 2 is
It is formed in a rectangular shape in a plan view. Then, a rectangular dispersion pattern of powder particles can be intermittently formed on the conveyed product S. The shape of the spray port 22 is
The shape is not limited to this rectangular shape, and can be formed in a shape that matches the distribution pattern of the powdery particles formed on the conveyed material S.

Further, the carrying section 21 is provided with a plurality of ridges over the entire circumference of the timing belt 2 at a predetermined interval between the plurality of spray ports 22. The side surfaces of these ridges (side surfaces on the front side in the carrying direction of the timing belt 2) allow the powder particles to be carried. And these ridges are arrange | positioned like ridges 21a-21d on both sides of the spray mouth 22, for example, and the side surface part of the said ridge 21b is the said spray mouth 22.
Is provided so as to be substantially flush with the inner end of the. Also,
The height d (see FIG. 2) of the ridges of the 21 conveyor section can be set according to the ascending gradient of the timing belt 2, the rotation speed, etc., but is 0.5 to 3 cm, preferably 0.5 to 3 cm.
It is set to 1 cm.

As shown in FIG. 1, the winding means 3 is composed of five winding pulleys 31 to 35 arranged so as to form a substantially inverted trapezoidal outline in a side view. , A substantially horizontal spraying section A is formed between the winding pulleys 33 and 34 with the inner surface of the timing belt 2 facing upward, and is continuous with the spreading section A between the winding pulleys 34 and 35 and with respect to the spraying section A. The conveyance section B is formed so as to be inclined at an ascending slope of a predetermined angle. The climbing slope is an angle between the spraying section A and the transporting section B (angle formed by the timing belt 2 in the spraying section A and the transporting section B), and is 30 to
It is set to 80 degrees, preferably 50 to 70 degrees. A transport tunnel 7 is provided in the transport section B, and it is possible to prevent the powder and granules transported by the transport unit 21 from falling while slidingly contacting the outer surface of the timing belt 2 to prevent its vibration. It has been done.

The driving means 4 comprises the winding pulley 3
The timing pulley 40 is arranged between the No. 2 and 33, and a drive motor (not shown) for driving the timing pulley 40. The timing belt 2 can be rotated in the longitudinal direction at a predetermined speed.

As shown in FIG. 1, the supply means 5 has a funnel 50 for storing a certain amount of powder and granules and a screw auger 51 for measuring and delivering the powder and granules.
And a scattering disc 52 for increasing the dispersion width of the powder and granules, and a scattering prevention cylinder 53 for preventing the dispersion of the powder and granules and for determining the dispersion width. The distance between the lower surface of the dispersion disc 52 and the inner surface of the timing belt 2 is not particularly limited, and the distance between the scattering prevention cylinder 53 and the inner surface of the timing belt 2 is
It is preferable to eliminate the gap as much as possible in order to suppress the spread of the spray pattern due to the scattering of the powder or granules to the unnecessary spots. A supply hopper 8 is installed above the funnel 50 so that powder particles can be sequentially supplied to the funnel 50.

The recovery means 6 includes a recovery hopper 60 installed above the funnel 50 and a recovery hopper 6.
It is constituted by a vibrator 61 which is disposed above 0 via a timing bell 2, and the outer surface of the timing belt 2 passing through the conveyance section B is vibrated by the vibrator 61 and is conveyed by the conveyance section 21. The granular material can be dropped into a recovery hopper to be recovered and supplied to the funnel 50.

Although not shown in the figure, in the spraying device 1, the driving means 4 is designed to operate at the same speed in cooperation with the conveying means (not shown) for the conveyed object S. Further, the supply means 5 has a control unit which can be controlled in conjunction with the transported object S to arbitrarily control the spray amount.

Next, the procedure of the method for spraying powdery or granular material according to the present invention will be described based on the operation by the spraying device 1 and its operation.

First, as shown in FIG. 1, the apparatus 1 having the above-described structure is installed on a conveyed product. Then, the granular material is supplied to the supply hopper 8 and the granular material is stored in the funnel 50.

Then, the driving means 4 is operated to continuously rotate the timing belt 2 wound around the winding means 3 in the longitudinal direction (the direction of arrow X in FIG. 1). Then, the conveyed object S is moved in the longitudinal direction (the direction of arrow Y in FIG. 1) at the same speed as the moving speed of the timing belt, and at the same time, the screw auger 51 is rotated to guide the powdery or granular material to the dispersion disk 52 and Thereby, the continuous flow of the powder and granules is spread downward into a conical shape that spreads downward, and is further dropped along the inner surface of the spray cylinder 53.

In this way, the powder or granules are dropped from above the spraying section A to spray the powder or granules through the spraying port 22, and the spraying pattern having substantially the same shape as the spraying port 22 on the conveyed object S. And the powder particles that have not been sprayed through the spray port 22 are transported upward through the transport section B by the transport portion 21 of the timing belt 2.

Then, when the conveying section 21 for conveying the granular material passes over the winding pulley 35, the vibration of the vibrator 61 that has been operated in advance causes the granular material to fall into the recovery hopper 60 for recovery.

By repeating the above-mentioned procedure, it is possible to intermittently form a spray pattern having a substantially same shape as the spray port 22 on the transported object 2 in the transported object S at a predetermined interval. In addition, in the case of cutting the conveyed article S following the above steps, by making the moving speed of the timing belt 2 and the rotation speed (peripheral speed) of the rotary cutter the same, after cutting, the same spreading position is obtained. It is possible to produce a pattern in which powder particles are dispersed.

As described above, according to the above-described spraying device 1 and the powdery or granular material spraying device according to the present invention, the spraying device 1 is used.
Since the timing belt 2 is rotated in the longitudinal direction, centrifugal force does not act even when it is operated at high speed, scattering of powder and granules is suppressed, and powder and granules are sprayed to a portion where spraying is unnecessary. It is possible to reliably suppress the above, and it is possible to stably form an arbitrary spray pattern having a clear contour. Further, the moving speed of the timing belt 2 and the conveyed object S
Since the moving speed is set to the same speed, the spraying pattern having substantially the same shape as the spraying port 22 can be stably formed on the conveyed object S at constant intervals even if the spraying cycle is increased or decreased. Further, the pattern spraying of the powdery particles and the recovery of the powdery particles not sprayed through the spraying port 22 are directly performed by the single timing belt 2, so that the maintenance is easy and the powdery particles can be effectively used. .

The powder or granules to be sprayed in the method for spraying powder or granules according to the present invention are not particularly limited, but powders and granules having a particle size of about 50 to 1000 μm are preferable. Also,
When the method for spraying powdery or granular material of the present invention is used in a manufacturing process of an absorbent body for absorbent articles such as sanitary napkins and diapers, the particle size of the powdery or granular material is 50 to 5
A blood-absorbing polymer, a water-absorbing polymer or the like having a diameter of about 00 μm is used.

The material to be conveyed in the method for applying powder or granules according to the present invention is not particularly limited, but the method for applying powder or granules according to the present invention can be applied, for example, to sanitary napkins and diapers. When used in the process of manufacturing an absorbent body of an absorbent article such as the above, as the above-mentioned conveyed product, a water absorbent sheet comprising a crushed pulp laminated sheet, water absorbent paper or the like, which constitutes the absorbent body, is used.

The powdery or granular material spraying device according to the present invention is not limited to the spraying device 1 of the above-mentioned embodiment, and its size, shape, etc. may be appropriately changed without departing from the object of the present invention. You can

For example, the winding arrangement of the timing belt by the winding means is not limited as long as it has at least the spraying section and the conveying section.
Depending on the length of the timing belt, the number of winding pulleys can be increased and the number can be changed as appropriate.

It goes without saying that the method of spraying the powder and granules according to the present invention is not limited to the practice of the spraying apparatus 1 of the above-mentioned embodiment.

[0036]

EFFECTS OF THE INVENTION According to the method and apparatus for spraying powder and granules of the present invention, the following effects can be achieved. Claim 1
According to the method for spraying powder and granules described in (1), since the timing belt is rotated in the longitudinal direction, centrifugal force does not act even when operating at high speed, and scattering of powder and granules is suppressed, and spraying is performed. It is possible to surely prevent the powder and granules from being sprayed onto the unnecessary portions, and to stably form an arbitrary spraying pattern having a clear contour. Moreover, since the powder and granules are scattered and collected by the timing belt, maintenance is easy,
It is also possible to effectively use the powder and granules.

According to the method for spraying the granular material according to the second aspect, the moving speed of the conveyed product and the moving speed of the timing belt are the same speed. Therefore, the granular material according to the first claim. In addition to the effect of the above-mentioned spraying method, it is possible to form a spraying pattern having substantially the same shape as the shape of the spraying opening of the timing belt on the conveyed object.

[0038] According to the powdery or granular material spraying device of the third aspect, it is possible to preferably carry out the powdery or granular material spraying method of the present invention having the above effects.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a main part of an embodiment of a powder and granular material spraying device according to the present invention.

FIG. 2 is a perspective view of a main part showing a configuration of a timing belt of the powdery- or granular-material spraying device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powder-dispersing device 2 Timing belt 20 Timing pulley 21 Conveying part 22 Dispersing port 3 Winding means 4 Driving means 5 Supplying means 6 Collecting means A Dispersing section B Conveying section

Claims (3)

[Claims] 1. A method for spraying powder particles on a moving object in a predetermined spray pattern, the method comprising a timing pulley on an outer surface and a transfer section for the powder particles to be collected on an inner surface. An endless timing belt having a plurality of spraying openings at predetermined intervals in the longitudinal direction, and a substantially horizontal spraying section in which at least the inner surface of the timing belt faces upward, It is wound by a winding means so as to form a conveying section that is inclined at an ascending slope of a predetermined angle with respect to the section, and then the wound timing belt is rotated in the longitudinal direction, from above the spraying section. Particles characterized by dropping the particles and spraying the particles through the spraying port onto the conveyed object, and conveying and collecting the particles at the conveying portion of the timing belt. The method of spraying. 2. The method for spraying powdery or granular material according to claim 1, wherein the moving speed of the conveyed product and the moving speed of the timing belt are the same. 3. A powdery-particles spraying device for spraying powdery-particles on a moving object in a predetermined spraying pattern, comprising a timing pulley on an outer surface and a powdery-particles transporting unit on an inner surface. An endless timing belt having a plurality of spraying openings at predetermined intervals in the longitudinal direction, a substantially horizontal spraying section with at least the inner surface of the timing belt facing upward, and the spraying section continuous to the spraying section A winding unit that winds the timing belt so as to form a conveyance section that is inclined at an ascending slope of a predetermined angle with respect to the section, and a drive that rotates the timing belt that is wound around the winding unit in the longitudinal direction. Means, a powder and granular material supplying means for dropping the powder and granular material from above the spraying section and spraying the powdery and granular material onto the conveyed material through the spraying port, and the conveying section of the timing belt. Spraying apparatus granular material, characterized in that it comprises a recovery means for recovering the feed has been granular material.