JP3989123B2 - Manufacturing method of molded body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a molded body and a manufacturing apparatus capable of efficiently and continuously producing a high-density molded body and reducing the size of the apparatus.
[0002]
[Prior art]
Japanese Patent Publication No. 6-142 discloses an apparatus for continuously producing absorbent fiber products, in which a rotating drum having a plurality of concavities for accumulation on the outer peripheral surface and the raw material are scattered on the outer peripheral surface of the rotating drum. A raw material supply mechanism for supplying the raw material in a state, and sucking and depositing the supplied raw material into each accumulation recess, and sequentially releasing the deposited material from the accumulation recess on the delivery conveyor. An apparatus for continuously producing a molded body made of raw materials is described.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, the pitch of the fiber product discharged on the delivery conveyor is approximately the length obtained by dividing the length of the outer periphery of the rotating drum by the number of recesses for accumulation. In order to obtain a long pitch, it is necessary to increase the diameter of the rotating drum, and it is difficult to reduce the size of the apparatus. Moreover, since sufficient deposition time cannot be secured, it has been difficult to produce a high-density fiber product.
[0004]
Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a molded body that can efficiently produce a high-density molded body continuously and can reduce the size of the apparatus.
[0005]
[Means for Solving the Problems]
In the present invention, a rotating drum having a plurality of accumulation concave portions on the outer peripheral surface for sucking and depositing the raw material is rotated, and the raw material is supplied in a scattered state from the outside to the outer peripheral surface of the rotating drum that is rotating. In the method of manufacturing a molded body in which the raw material is deposited in each of the plurality of accumulation recesses, and then the deposit of the raw material is released as a molded body, each accumulation in the rotating drum during rotation is performed. The above object is achieved by providing a method for producing a molded body in which the raw material is supplied to the concave portion for multiple times.
[0006]
Further, the present invention provides a rotating drum having a plurality of concave portions for accumulation on the outer peripheral surface for sucking and depositing the raw material, and a raw material supply mechanism for supplying the raw material in a scattered state from the outside to the outer peripheral surface of the rotating drum. And a molded body manufacturing apparatus comprising a molded body discharge mechanism that releases and discharges the deposits of the raw material respectively deposited in the plurality of accumulation recesses as molded bodies, wherein the molded body discharge mechanism is rotating An apparatus for producing a molded body configured to release the deposit of the raw material in each of the accumulation recesses after the raw material is supplied to each accumulation recess in the rotating drum a plurality of times. By providing this, the above-mentioned object is achieved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments thereof.
The apparatus for producing a molded body according to this embodiment is an apparatus for producing an absorbent body for hygiene items such as paper diapers and sanitary napkins using pulp fibers and the like as a raw material, and has a concave portion 2 for collecting the material 1 by suction. A plurality of rotating drums 3, a raw material supply mechanism 4 for supplying the raw material 1 in a scattered state to the outer peripheral surface of the rotating drum 3, and a plurality of accumulation recesses 2, 2. A molded body discharge mechanism 6 for releasing the deposited material deposit as a molded body 5 is provided.
[0008]
The compact discharge mechanism 6 then deposits the raw material in each accumulation recess 2 after the material 1 is supplied to each accumulation recess 2 in the rotating drum 3 during rotation a plurality of times (twice). 5 is released from the mold.
[0009]
More specifically, the rotating drum 3 is a bottomed cylindrical body having one end opened, and a plurality (odd number) of collecting recesses 2 are formed at equal intervals in the circumferential direction on the outer peripheral surface thereof. . Each accumulation recess 2 is opened outward in the radial direction of the rotary drum 3 and has a number of suction holes on its bottom surface. One end of the rotating drum 3 that is opened is substantially hermetically sealed by a non-rotating fixed wall (not shown), and the interior of the rotating drum 3 is separated by a partition 31 fixed to the fixed wall. It is divided into a negative pressure part 3a that is maintained at a negative pressure by a vacuum pump or the like and a non-negative pressure part 3b that is not maintained at a negative pressure. The rotary drum 3 is rotationally driven in the direction of the arrow X in FIG. 1 with its axis as the rotation axis, and while each accumulation recess 2 passes through the raw material supply region C covered by the raw material supply pipe 41, The negative pressure of the negative pressure portion 3 a acts on each accumulation recess 2, and the raw material 1 is sucked and deposited in each accumulation recess 2.
[0010]
The raw material supply mechanism 4 is a mechanism for supplying the raw material 1 in a scattered state from the outside to the outer peripheral surface of the rotary drum 3, and puts fibrous pulp as a raw material on an air flow generated in the raw material supply pipe 41. It comes to supply.
[0011]
The compact discharge mechanism 6 is a mechanism for releasing the material deposits accumulated in the plurality of stacking recesses 2, 2 as molds 5, and each stacking recess from the inside of the rotary drum 3. The air is blown to the bottom surface of each of the two, and the deposit 5 in each of the accumulation recesses 2 is pressed by the air to release the mold.
The compact discharge mechanism 6 includes an intermittent discharge roll 61 that has an air discharge port on its outer peripheral surface and rotates in synchronization with the rotary drum 3, a known drive mechanism that rotates the intermittent discharge roll 61, and the intermittent discharge roll 61. The air is introduced into the intermittent discharge roll 61, and the air is discharged from the discharge port only when the discharge port of the intermittent discharge roll 61 faces the bottom surface of the concave portion 2 for accumulation. The deposit 5 in the recess 2 is pressed and discharged.
[0012]
The intermittent discharge roll 61 rotates the same number (9 rotations) as the number of recesses 2 for accumulation every two rotations of the rotating drum 3, and discharges the deposits in the circumferential direction of the rotating drum 3. This is performed every other one of the plurality of stacking recesses 2 arranged side by side.
Then, the compact discharge mechanism 6 allows each accumulation recess to pass through the material supply region C twice, so that the raw material 1 is supplied twice to each accumulation recess 2 and then the inside of each accumulation recess 2 The material deposits are released from the mold. The compact discharge mechanism 6 sequentially deposits the deposits of the raw material 1 discharged from the accumulation recesses 2 on the conveyance belt 7 that is continuously conveyed from one to the other with respect to the pitch of the accumulation recesses 2. Are placed at a pitch P (see FIG. 1) of about twice. The intermittent discharge roll 61 is connected to a compressor or the like via an air introduction pipe (not shown).
[0013]
The manufacturing apparatus according to the present embodiment includes a compression mechanism 8 that can compress and compress the deposits in the accumulation recesses 2 with a plurality of different pressing forces.
The compression mechanism 8 includes a pressing roll 81 having two types of pressing protrusions 82 having different protrusion heights on the peripheral surface, and the both pressing protrusions 82 pass through the compression portion E from the outside of the rotating drum 3. By alternately inserting into the recesses 2, the deposits in the accumulation recesses 2 are pressed and compressed.
[0014]
Next, a preferred embodiment of a method for producing a molded body using the production apparatus of the present embodiment, that is, a method for producing a molded body of the present invention will be described.
First, the rotating drum 3 is rotated at a constant speed, and at the same time, the negative pressure portion 3a in the rotating drum 3 is set to a negative pressure, thereby generating an air flow in the raw material supply pipe 41 that can convey the raw material 1 of the molded body.
Then, the raw material supply mechanism 4 is operated, the raw material 1 is supplied to the outer peripheral surface of the rotary drum 3, and the raw material 1 is sucked and deposited in each of the accumulation recesses 2, 2 ·. And every other compact discharge mechanism 6 is made to act on concave part 2 for accumulation.
[0015]
In order to explain the steps of supplying the raw material to the respective concavities 2 for accumulation, compressing, supplying the raw material again, and releasing the mold release in the manufacturing method according to the present embodiment, all the collective materials are used with reference to the state shown in FIG. Numbers {circle around (1)} to {circle around (9)} are sequentially assigned to the concave portion 2 from the concave portion for accumulation located at the stacking start position indicated by A in FIG. 1, and one of the concave portions for accumulation {circle around (1)} is taken as an example. A description will be given of the order in which raw material supply, compression, re-feeding, and mold release are performed on the concave portion (1).
The accumulation concave portion (1) is in a state in which the accumulated drum is discharged from the discharge portion B and then moved to the fiber stacking start position indicated by A in FIG. Suppose that
When the accumulation concave portion {circle around (1)} moves to the raw material supply region C by the rotation of the rotating drum 3, the first supply of the raw material to the accumulation concave portion {circle around (1)} is performed. The first supply of the raw material is continued until the accumulation concave portion {circle around (1)} passes the stacking end position D.
When the rotating drum 3 further rotates and the stacking concave portion (1) moves to the compression portion E, deposits in the stacking concave portion (1) are formed by the pressing protrusion 82 having a higher protruding height in the pressing roll 8. Strongly compressed.
[0016]
When the rotating drum 3 further rotates, the accumulation concave portion {circle around (1)} moves to the discharge portion B of the molded body. However, at this time, the discharge port of the intermittent discharge roll 61 faces the side opposite to the accumulation recess (1), and the deposit in the accumulation recess (1) is not released from the mold.
Then, the accumulation concave portion {circle around (1)} returns to the fiber stacking start position A while keeping the deposit by the first supply of the raw material inside.
In this way, during the first rotation of the rotary drum 3, the first-time supply of the raw material to the accumulation recess (1) and the strong compression of the deposit accumulated in the accumulation recess (1) are performed.
[0017]
When the rotating drum 3 further rotates and the accumulation concave portion {circle around (1)} moves again to the raw material supply region C, the second time raw material is supplied to the accumulation concave portion {circle around (1)}. The supply of the raw material for the second time is continued until the accumulation concave portion {circle around (1)} passes the stacking end position D.
When the rotating drum 3 further rotates, the accumulation concave portion (1) moves to the compression portion indicated by E in the figure. In the second rotation, the compression of the deposit by the pressing roll 8 is performed with a pressing force weaker than that in the first rotation by the pressing protrusion 82 having a lower protrusion height.
When the rotary drum further rotates 2/9 from the compression unit E and the concave portion for accumulation {circle around (1)} moves again to the discharge portion B of the compact, the discharge port of the intermittent discharge roll 61 is now on the side of the concave portion for accumulation {circle around (1)}. The deposit in the accumulation recess (1) is discharged onto the conveyor belt 7 by the air blown out from the discharge port.
[0018]
In this way, during the second rotation of the rotary drum 3, the second-time supply of the raw material to the accumulation recess (1), the strong compression of the deposit deposited in the accumulation recess (1), the first and By the second supply of the raw material, the deposit accumulated in the accumulation concave portion {circle around (1)} is released.
In the accumulation concave portion (1) from which the deposit is released, the first supply of raw materials and the weak compression of the deposit deposited in the accumulation concave portion (1) are further performed in the same manner as the first rotation. Done.
If the rotation of the rotary drum 3 is continued, the supply of the raw material to the accumulation concave portion {circle around (1)} and the release of the deposit of the raw material in the accumulation concave portion {circle around (1)} are repeated. A high-density molded body is obtained continuously from 1 ▼. Similarly, the supply of the raw material and the release of the deposit of the raw material are repeated in the other recesses {circle around (2)} to {circle around (9)}. And a high-density molded body is obtained.
[0019]
Thus, according to the manufacturing apparatus and the manufacturing method of the present embodiment, the raw material is supplied a plurality of times to each accumulation recess, and the release of the deposit of the material from the plurality of accumulation recesses is released. Since the accumulation is sequentially performed from the accumulation recesses where the raw materials are supplied a plurality of times, the deposits in the accumulation recesses 2 become high in density, and a high-density molded body can be continuously produced particularly efficiently.
Further, since the release of the deposit from the rotating drum 3 is performed every other recessed portion for accumulation, the distance between the recessed portions 2 for accumulation on the outer peripheral surface of the rotating drum 3 (distance between the centers) The pitch (distance between the centers) of the molded body 5 transferred onto the conveyance belt 7 can be increased. Therefore, even when the molded body 5 is joined or placed on another member conveyed at a large pitch, the small-diameter rotating drum 3 can be used, and the apparatus can be downsized.
[0020]
In the molded body manufacturing apparatus and manufacturing method according to the present invention, the number N of collecting recesses, the number M of raw materials supplied to each stacking recess, the arbitrary number L selected in consideration of the size of the rotating drum, and the pressure roll It is preferable to manufacture the molded body so that the number T of pressing protrusions and the interval P for releasing the mold satisfy the conditions shown in the following formula (the interval P for releasing the mold is from the stacking recess) This means that the deposit is discharged every P. Further, N, M, P, L, and T are integers.)
N = (L + 1) M−1 M ≧ 2, L ≧ 1
P = M
T = M
In addition, it is preferable that the discharge roll 61 having the discharge port at one place on the roll is rotated 1 / M while the rotary drum 3 rotates 1 / N as described above.
If a molded body is manufactured under such conditions, the molded body can be continuously discharged at the same pitch. For example, the manufacturing efficiency when manufacturing a product using the molded body can be improved.
[0021]
The present invention (method and apparatus) is suitable for the production of an absorbent body, and it is preferable to use pulp fibers and / or a polymer absorbent polymer as a raw material of the molded body. Moreover, this invention can be applied also to manufacture of various molded objects other than an absorber using raw materials, such as a fibrous form, a granular form, and a powder form other than an absorber.
In the present invention, the raw materials may be supplied to each of the accumulation recesses three times or more. Further, the mold release may be performed every three or more of the concave portions for accumulation.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and manufacturing apparatus of a molded object which can produce a high-density molded object efficiently and can aim at size reduction of an apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a manufacturing apparatus according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Raw material 2 Accumulation recessed part 3 Rotating drum 4 Raw material supply mechanism 5 Raw material deposit (molded body)
6 Formed body discharge mechanism 61 Intermittent discharge roll 7 Conveying belt 8 Compression mechanism A Stacking fiber start position B Molded body discharge part C Raw material supply area D Stacking fiber end position E Compression part

Claims (3)

Rotating a rotating drum having a plurality of accumulation recesses on the outer peripheral surface for sucking and depositing the raw material, supplying the raw material from the outside in a scattered state to the outer peripheral surface of the rotating drum, In the method of manufacturing a molded body, in which the raw material is deposited in each of the accumulation recesses, and then the deposit of the raw material is released as a molded body.
When focusing on the individual recesses for accumulation, the rotating drum is rotated a plurality of times between the time when the deposit is released from the mold release and the time when the deposit is released next. The manufacturing method of the molded object which supplies the said raw material to each recessed part for accumulation | storage in the said rotating drum several times, respectively. The method for producing a molded body according to claim 1 , wherein in the discharge unit for releasing the deposit, the release of the deposit is performed every one or a plurality of the concave portions for accumulation . Claims: After the material is supplied to the accumulation recess, the deposit in the accumulation recess is pressed and compressed before the material is further stacked on the accumulation in the accumulation recess. Item 3. A method for producing a molded article according to Item 1 or 2 .

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