JPH1143900A - Production paper-made flanged cylinder and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flanged cylindrical article as a bobbin that is practically useful because of its thin wall and toughness by pulp molding. SOLUTION: The first molding members 2 comprising the body mold and the flange mold and the second molding member 3 having a flange mold are set to the first rotary shaft 31 and the second rotary shaft. They are rotated in the fiber slurry tank 36 to cause a flow difference between the mold faces and the fiber slurry and the vacuum is applied to the mold faces so that the fibers are deposited on the mold faces. After vacuum-sieving, the mold one is positioned out of the slurry and vacuum-drained. In the demolding process, pressurized air is fed from the face of the drum mold to peel off the molded product, as the flange is prevented from being folded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a cylindrical article having a flange by a pulp mold or the like.
In particular, the present invention relates to a method and an apparatus for forming a cylindrical article with a flange, which can be easily formed even with a bobbin having flanges on both sides.

[0002]

2. Description of the Related Art Conventionally, bobbins and cores for winding and storing wires such as wires, threads, and strings in a coil shape are generally made of metal, plastic, wood, cardboard, or the like. However, in the case of a disposable bobbin such as a small bobbin, which is not recycled, there is a problem that bobbins made of these materials are not preferable from the viewpoint of resource saving and environmental problems, and are expensive. Therefore, the present invention seeks to obtain a cylindrical article with a flange such as a bobbin by pulp molding from a pulp slurry in which, for example, waste paper is dissolved, in order to achieve effective use of resources and beautification of the environment, and cost reduction. is there. In the conventional pulp molding method, the fibers in the slurry are simply adsorbed and deposited on the mold surface by vacuum action to form a paper.However, since there is no entanglement of the fibers, the paper product is easily peeled and broken, and the wall thickness is increased. However, there is a disadvantage that the strength is low. Therefore, in this method, it is difficult to obtain a bobbin having a strength that can be used.

On the other hand, in order to make up for the drawback that the fibers are not entangled with each other, a pre-sheet is formed by vacuum from a fiber slurry such as pulp or synthetic resin fiber impregnated with a resin as a binder, then dried in a furnace and then compression-molded. The method is conventionally adopted. However, according to this method, the cost is increased due to the complexity of the papermaking apparatus and the complexity of the manufacturing process, and the above problem has not been solved. In addition, it is difficult to form an article having a flange on both sides of a cylindrical body by this method. Therefore, the production of a flanged cylindrical article, for example, a bobbin by papermaking such as a pulp mold, has not yet been put to practical use.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to obtain a thin and durable cylindrical article with a flange, such as a bobbin, which can be practically used without a resin impregnation by a simple manufacturing process at a low cost. It is an object of the present invention to provide a method and an apparatus for making a cylindrical article with a flange by a pulp mold or the like.

[0005]

According to the present invention, there is provided a papermaking method for a cylindrical article with a flange by a pulp mold, which comprises vacuuming a mold member having at least a body mold surface and a flange mold surface in a fiber slurry. A papermaking step of communicating with a source, and causing a flow difference between the mold surface and the fiber slurry in the vicinity of the mold surface while depositing fibers on the mold surface by vacuum to form a paper, and positioning the mold member outside the fiber slurry liquid. And a demolding step of demolding the dehydrated paper product from the mold member.

The most effective means for producing a flow difference between the mold surface and the fiber slurry in the vicinity of the mold surface is to form the paper while rotating the mold member in the fiber slurry solution. It is also effective to stir or to spray the fiber slurry from the nozzle near the mold surface. In addition, in the case of an article with a flange, since the body and the flange have different strengths at the time of peeling from the mold surface, the flange is easily bent at the time of demolding, but in order to prevent it,
In the demolding step, the body of the paper product is peeled off from the body mold surface by injecting pressurized air from the body mold surface, and then the flange is peeled off without damaging or deforming the article. Can be removed properly. Further, by shaping the inner surface of the flange of the flanged cylindrical article formed after the release process with a shaping roller, a flanged cylindrical article having no unevenness on the inner surface of the flange can be obtained.

On the other hand, the apparatus for making cylindrical articles with flanges by pulp mold of the present invention, which implements the above-mentioned papermaking method, comprises:
A fiber slurry tank for storing fiber slurry, which can be located in the fiber slurry tank, comprising a mold device comprising at least a body mold having a body mold surface and a flange mold having a flange mold surface; The apparatus is fixed to a hollow shaft, and a through hole communicating with the hollow portion of the hollow shaft is formed in the body mold surface and the flange mold surface, and the mold surface can be vacuumed or pressurized through the hollow shaft. It is characterized by having become.

As means for generating a flow difference in the fiber slurry in the vicinity of the mold surface, the above means can be achieved by forming the hollow shaft into a rotary drive structure by being connected to a rotary drive device. The above means can be achieved by providing a screw for stirring the slurry. Further, a nozzle for spraying the fiber slurry may be provided near the mold surface. Further, by providing a valve that opens and closes a through hole formed in the flange mold surface, it is possible to easily control the injection of pressurized air to the flange mold surface in the demolding process, thereby damaging or deforming the article. The mold can be successfully removed without using the mold.

[0009] In the case of a papermaking apparatus for forming a cylindrical article having flanges on both sides of a body by pulp molding, the mold apparatus is composed of a body mold having a body mold surface and a flange mold having a flange mold surface. The first mold member is formed integrally with the second mold member having the other flange mold surface, and the second mold member is provided so as to be relatively movable along the same axis as the first mold member. By fixing to the other hollow shaft, both hollow shafts can be relatively moved in the opposite direction along the axis, so that the molding device is not complicated and the removal of the molded article is easy. Can be done.

By providing a shaping device having a shaping plate movable with respect to the body mold surface, it is possible to obtain a paper product having less irregularities on the outer peripheral surface other than the papermaking surface. Also,
By providing a paper removal apparatus having a clamp for gripping the body of the paper at the time of removing the paper, the removed paper can be automatically taken out, thereby further improving production efficiency. it can. Further, the hollow shaft has a large-diameter chamber at the tip end, the mold member is fixed to the open end of the chamber, and the hollow shaft is switchable between a vacuum source and a pressurized air source. By providing the pipe so that the open end of the hollow pipe faces the bottom of the chamber, it is possible to effectively control the vacuum of the fiber slurry and the supply of pressurized air to the mold surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is an overall schematic view of a bobbin papermaking apparatus according to an embodiment of a flanged cylindrical article papermaking apparatus of the present invention. The bobbin paper making apparatus of this embodiment has a bobbin 5 having flanges 52 and 53 on both sides of a body 51 as shown in FIG.
0, and the first slurry is placed in the fiber slurry tank 36.
The mold apparatus 1 includes a combination of a mold member 2 and a second mold member 3. The mold device 1 is, as clearly shown in FIG.
The first hollow shaft 4 whose first mold member 2 is located on the right side in the drawing.
The second mold member 3 is fixed to the open end of the chamber 26 formed in the large-diameter portion 5, and the second mold member 3 is located on the left side, and is rotationally driven synchronously with the first hollow shaft around the coaxial center. The hollow shaft 6 is fixed to the open end of the chamber 33 formed by the large diameter portion 7.

The first mold member 2 has a cylindrical body mold 10 for forming the body of the bobbin and a flange mold 11 for forming one of the flanges 52 integrally formed. 1 is a shaft hole 9 communicating with the hollow portion of the hollow shaft 4,
The end on the side of the first mold member is closed by a top wall 12, and an engagement shaft 13 for engaging the second mold member 3 on the same axis along the axis is formed outside the top wall. Have been. on the other hand,
The second mold member 3 is composed of only the flange mold 21 for making the other flange 53, and the central portion of the second mold member 3 is engaged with the engagement shaft 13 of the first mold member 2 to form the second mold member 3. An engagement recess 14 is formed to match the axis of the first mold member with the axis of the first mold member.

The body mold 10 of the first mold member 2 has an outer diameter substantially equal to the body inner diameter of the bobbin to be made, the entire outer peripheral surface forms a body mold surface 15, and the flange mold 11 is An annular flange-shaped surface 16 having a disk shape larger in diameter than the above-mentioned flange and having substantially the same outer diameter as the flange diameter of the bobbin to be formed is formed at a predetermined depth. A plurality of through holes 17 and 18 are respectively formed in the body mold surface 15 and the flange mold surface 16. A valve guide shaft 19 is formed at the center of the flange type so as to protrude into the chamber 26, and the valve 25 is slidably supported by the valve guide shaft. A through hole 1 is provided on the back of the flange mold surface of the flange mold 11.
An annular recess 20 is formed so as to include a range where 8 is located, and communication of the annular recess 20 with the chamber 26 can be controlled by a valve 25.

The valve 25 is provided for controlling the flow of air in order to remove the bobbin, which has been made from the mold, as described later. This is one of the characteristic features of the embodiment. In the present embodiment, the valve 25 has a tapered wall 27 that engages with the annular outer wall edge of the annular recess 20 and an annular wall 28 that slides on the annular inner wall, as shown in the figure, and slides to the left in the drawing. By moving, the annular concave portion 20 is closed, and is opened by sliding to the right side. However, the shape is not necessarily limited to the shape. For example, both surfaces may be formed into a tapered surface, or may be simply formed into a flat plate shape. It may be formed. 29 in the figure
A stopper 25 is a stopper for preventing the valve 25 from falling off. Similarly, a through hole 22 is formed in the flange mold surface 21 of the second mold member 3. And
In order to prevent fibers from passing through the through holes formed in the mold surfaces of the first mold member 2 and the second mold member 3, a net 23 made of a wire mesh is provided on the surface of each mold surface.
24 (specified in FIG. 4) are arranged.

As shown in FIG. 1, the first hollow shaft 4 and the second hollow shaft 6 are rotatable and axially slidable on a sliding frame 30 slidably provided on a rail 44 of the apparatus main body. The bearings are freely supported, and pipes 31 and 32 penetrate therethrough. The pipe is fixed, the base end is connected to a vacuum pump, and the tip end is bent downward,
As shown in the figure, it faces the bottom of the chamber 26 of the first hollow shaft 1 and the bottom of the chamber 33 of the second hollow shaft 6 with a slight space therebetween, so that the liquid accumulated in the chamber can be sucked. Further, the first hollow shaft 4 and the second hollow shaft 6 have connecting portions 34 and 35 to a source of pressurized air,
Pressurized air can be supplied to each of 6 and 33. However, the pipes 31 and 32 may be switchably connected to a vacuum pump and a pressurized air source. In addition, 4
Reference numerals 5 and 46 denote rotary joints, so that the first hollow shaft 4 and the second hollow shaft 6 can freely rotate with respect to the connecting portions 34 and 35, respectively.

The mold device 1 is provided in a fiber slurry tank 36 as shown in the figure. The fiber slurry tank, a not shown pump, the liquid level of the fiber slurry during the papermaking process, the liquid level L ₁ as mold surface of at least the mold apparatus as shown in FIG. 1 is immersed in all-liquid ,
Also during the dehydration step, the mold apparatus is adapted to adjust the liquid level L _2, such as to be positioned above the liquid surface. Further, a shaping plate device having a shaping plate 38 (FIG. 2) for shaping the outer peripheral surface of the bobbin by contacting the bobbin outer circumferential surface before the bobbin forming operation, and a clamp for taking out the bobbin from the mold device after the bobbin forming operation is completed. A take-out device having a member 39; and a flange shaping roller device (not shown) provided with tapered rollers for shaping the inner peripheral surface of the flange of the papermaking article in the dewatering step so as to face the flanges on both sides. ,
These devices are driven by a robot device (not shown). Although the shaping plate 38 is a rectangular plate in the present embodiment, a roller may be used instead of the plate. In FIG. 1, reference numeral 40 denotes a drive motor,
The second hollow shaft 6 is rotated via an appropriate transmission mechanism such as a chain sprocket 41 or a pulley provided on the second hollow shaft. In addition, 42 is a speed reducer. The first hollow shaft 4 and the second hollow shaft 6 are provided so as to be slidable in opposite directions in the axial direction together with the sliding frame 30 by a displacement mechanism (not shown).

The bobbin making apparatus using a pulp mold or the like according to this embodiment is configured as described above, and the bobbin shown in FIG. 6 is made by the bobbin making apparatus in the following steps. In the present embodiment, a case will be described in which a pulp slurry is employed as a fiber slurry and a bobbin is formed from the pulp slurry. As shown in FIG. 1, a fiber slurry 41 such as used paper is put into the fiber slurry tank 36 to the extent that the mold apparatus is immersed therein.
0 and 30 are slid so as to approach each other, and the engagement shaft 13 of the first mold member and the engagement recess 14 of the second mold member are engaged. By rotating the second hollow shaft 6 at a predetermined speed in a state where
The second mold member also rotates integrally. At the same time, a vacuum pump (not shown) is operated to operate the chamber 2 through the pipes 31 and 32.
6 and 33 are evacuated to a negative pressure state.

When the pressure in the chamber 26 is reduced to a negative pressure, the fiber slurry in the tank is sucked into the vacuum chamber through the shaft through-hole 9 and the through-hole 17 by the vacuum action. Placed net 22
And is deposited on the trunk mold surface 15 to form the trunk. At the same time, as shown in FIG. 2, the valve 25 is drawn to the right side by the vacuum action, so that the annular concave portion 20 is opened, and the chamber 26 communicates with the inside of the tank through the through hole 18, and the flange is formed similarly to the body. Pulp is also deposited on the mold surface by vacuum action, and bobbin flanges are formed. On the other hand, since the chamber 33 also has a negative pressure at the same time, a valve is deposited on the flange mold surface 21 of the second mold member 3 by the vacuum action, and the other flange 53 is formed. Therefore, according to the apparatus of the present invention, as shown in FIG. 2, bobbins having flanges on both sides can be simultaneously integrally formed.

During the above-mentioned papermaking process, the mold apparatus 1 is rotated in the fiber slurry by the synchronous rotation of the first hollow shaft 4 and the second hollow shaft 6. As a result, a flow difference occurs in the fiber slurry 41 near the mold surface, that is, a flow in the rotational direction having a larger velocity as the mold slurry is closer to the mold surface, and fibers are entangled one by one along the mold surface and deposited. As a result, a thin and strong paper product in which the fibers are strongly entangled is obtained. The liquid aspirated into the chamber is a fixed pipe 31 facing the bottom of the chamber,
It is vacuumed by 32 and discharged outside.

Before the end of papermaking, the shaping plate 38 descends at a predetermined stroke, and the shaping surface formed at the lower end thereof is kept in contact with the pulp surface deposited on the body mold surface, and the shaping surface continues to rotate. Thereby, the unevenness of the outer surface of the bobbin body is leveled, and at the same time, the bobbin body is shaped to a predetermined thickness, and the inner peripheral surfaces of both side flanges of the bobbin are leveled at the side edges of the shaping plate 38. Therefore, according to the present apparatus, not only the surface in contact with the mold surface, but also a bobbin with a beautiful outer surface having few irregularities can be obtained.

Dewatering and shaping process When the papermaking is completed, the liquid level of the fiber slurry in the tank is changed to a mold device 1.
If the inner peripheral surface of the flange is pressed and shaped with a roller or the like while the mold device 1 is continuously rotated in the air while being lowered further down, a bobbin with a particularly beautiful inner peripheral surface of the flange can be obtained. Thereafter, the chambers 26 and 33 are brought into a negative pressure state through the pipes 31 and 32, thereby sucking water from the paper product to perform dehydration. Thereby, from papermaking to dewatering can be continuously performed in the same apparatus, and dewatering can be performed effectively and uniformly in a short time.

[0022]Demolding process  The machined surface of the machined bobbin is attached to the mold surface net.
In order to remove the mold easily,
Must be effectively removed from the net. for that reason
Is pressurized air from the mold surface to the bobbin
Spraying is effective. Pipes 31, 32
Supply pressurized air into the chambers 26 and 33
In the first mold member, pressurized air is passed through holes 17 and 18.
More simultaneously supplied to the body and flange of the bobbin,
Acts to peel off the body and the flange. However,
As can be seen from the illustration, the flanges 52, 53 are at their ends.
Since the part is the open end in the peeling direction,
It is easy to bend from the root and peels off the pressurized air from the through hole 18.
The body is cylindrical and has both ends, while the separation resistance is weak.
With a flange, and the end of the flange
The flange is engaged with the
The resistance is significantly higher than the flange. Therefore, temporarily
When pressurized air is supplied to the holes 17 and the through holes 18 at the same time,
Pressurized air acts intensively on flanges with weak resistance
More specifically, as shown schematically in FIG.
It turns inward from the root. And through hole 18
Since the pressurized air escapes and the body cannot be pressurized,
Deformation of the paper product at the time of demolding because good peeling of the part is not possible
I will let you do it.

In the present embodiment, a valve 25 is provided to solve such a problem. Thereby, as shown in FIG. 3, when the pressurized air is supplied from the pipe 31, the valve 25 closes the annular concave portion 20 by the pressurizing action, and the pressurized air is prevented from acting on the flange surface from the through hole 18. The pressurized air is exclusively blown out from the through hole 17 through the axial hole 9 and is injected in the body radial direction. As a result, the trunk is first peeled off the surface of the net 23 as shown in FIG.
Then, the pressurized air hitting the trunk portion enters between the flange base portion and the flange-shaped surface to separate the flange 52 from the net of the flange-shaped surface 16 as shown in FIG. However, in the case of the bobbin having the shape of the embodiment in FIG. 6, since the body has a protruding tube 54 that protrudes in a stepped manner outside the left flange, the bobbin is disposed between the left flange 53 and the flange mold surface 21. No air is supplied through the through hole 17, and the left flange 53 is not peeled off. Therefore, in this embodiment, in order to separate the left flange, pressurized air is also preliminarily supplied to the chamber 33 via the pipe 32 so that the left flange 53 is separated from the flange surface 2.
1 was peeled off from the net 24. Thereby, as shown in FIG. 4, the bobbin papermaking surface is in a state where it is well separated from the nets 23 and 24 arranged on the mold surface.

In this state, a gripping device having an openable and closable clamp 39 (FIG. 1) for gripping the body of the bobbin enters the tank by a robot device (not shown) and lightly grips the bobbin 50 that has been made. In this state, the first hollow shaft 4 and the second hollow shaft 6 are slid and driven in a direction away from each other, whereby the first mold member 2 and the second mold member 3 are completely removed from the bobbin, and are formed by the action of the robot. The bobbins are taken out of the papermaking apparatus and supplied to the next drying step.
Before or during the drying step, by pressing and shaping the inner surfaces of the flanges on both sides of the pobin with a shaping roller, the flange layer can be made denser, the strength can be improved, and a smooth surface can be finished.

As described above, in this embodiment, papermaking, dewatering, demolding, and removal of a pulp mold bobbin having flanges on both sides can be automatically performed. Moreover, according to the apparatus of the present embodiment, the fibers are not simply laminated but are entangled one by one due to the flow difference between the mold surface and the fibers during the papermaking. Entanglement becomes stronger, and a thin and durable bobbin can be obtained. In addition, since a portion other than the molding surface that comes into contact with the mold surface by the shaping plate is also shaped by the pressure shaping roller, a pulp mold bobbin having a uniform thickness with little unevenness can be obtained.

In the demolding step, the molding surface is uniformly separated from the net on the molding surface, and then the molding is performed. Therefore, the papermaking product is not damaged or deformed, and the production yield is significantly improved. Can be. Although only a single type device is shown in the above embodiment, in an actual device,
The fiber slurry tank is formed to be long in the direction perpendicular to the paper surface in FIG. 1, and a plurality (for example, 10 sets) of mold devices are arranged in parallel so that a plurality of bobbins can be formed at the same time.

FIG. 7 shows a flanged cylindrical article making apparatus according to another embodiment of the present invention. In this embodiment, the configuration of the first mold member and the supply mechanism of the pressurized air for separating the paper product from the mold surface are different from those of the above embodiment. In the figure, 61 is a first mold member, and 62 is a second mold member.
It is a mold member. The first mold member 61 includes a flange mold 65 fixed to the opening end of the chamber 64 at the tip of the first hollow shaft 63.
And a body mold 67 formed of a portion of the pipe that extends through the inside of the first hollow shaft and projects from the center of the flange mold and is supported and protrudes from the flange mold. The first hollow shaft 63 and the pipe 66 are separately connected to a pressurized air source so that the supply of pressurized air can be controlled, and are also switchably connected to a vacuum source. Since the configuration of the second mold member is the same as that of the above-described embodiment, the same reference numerals are given to the drawings as in the above-described embodiment, and the detailed description is omitted.

The apparatus of this embodiment is configured as described above, and the papermaking step and the dewatering and shaping step are performed in the same manner as in the above embodiment. In the demolding step, first, pressurized air is supplied only to the pipe 66 so that the body-type through hole 68 is formed.
Compressed air comes out of the body, the body 51 of the paper product is peeled from the net 23, and then pressurized air is supplied from the through hole 69 of the flange mold 65 by supplying pressurized air to the first hollow shaft 63. The flange 52 is peeled off. Therefore, in this embodiment, there is no need to provide a valve for controlling the supply of pressurized air to the flange-type through hole. Note that if the pressurized air pressure supplied from the pipe 66 is higher than the pressurized air pressure supplied from the first hollow shaft 63, it is possible to simultaneously supply pressurized air. Also, the pressurized air is supplied only to the pipe 66 without supplying the pressurized air to the flange mold via the first hollow shaft 63, and the trunk mold is peeled off as in the case of the above-described embodiment. The flange 52 may be peeled off by pressurized air from the mold.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various design changes can be made within the scope of the technical idea. For example, in order to increase the entanglement of the pulp, the mold surface is rotated in the above-described embodiment as a method of giving a flow difference to the fiber slurry with respect to the mold surface. A method in which a nozzle is disposed in the vicinity and a fiber slurry is sprayed from the nozzle, or a method in which a screw is disposed in the vicinity of the outer peripheral portion of the mold surface to stir the valve slurry with a screw, and further, a fiber slurry in the vicinity of the mold surface with a pump And the like can be adopted.

Further, the structure of the valve is not limited to the one described in the above embodiment, but may be of various forms, as long as it can open and close a through hole formed in the flange-shaped surface. It may be one that can be switched. In the embodiment, since the left bobbin has the protruding tube, the pressurized air is also supplied to the left chamber at the time of demolding. Then, the second hollow shaft chamber 3
There is no need to supply pressurized air to 3. In the dewatering step and / or the demolding step, if hot air is supplied from the first pipe and the second pipe instead of the pressurized air, dehydration and drying can be performed more quickly.

In the above embodiment, the case where bobbins having flanges on both sides of the body are formed is described. However, it is needless to say that the present invention can also be applied to bobbin forming having a flange on only one side. In that case, the mold device may be constituted only by the first mold member in the above embodiment. Therefore,
In that case, in the apparatus shown in FIG. 1, the second mold member and the second hollow shaft 6 and the pipe 32 for supporting the second mold member are unnecessary. Further, the present invention is not limited to bobbins, but can be applied to the production of other cylindrical articles with a flange.

[0032]

As described above, according to the present invention, a thin and durable flanged cylindrical article that can withstand practical use can be obtained from a fiber slurry such as a pulp slurry using waste paper or the like as a raw material by pulp molding. For example, by applying the present invention to the manufacture of a bobbin of a tied wire coil used in a portable rebar tying device, it is possible to obtain a very inexpensive bobbin as compared with a conventional synthetic resin bobbin, and to contribute to resource saving. Moreover, since it can be easily burned or recycled even after use, it can also contribute to environmental conservation.

In particular, according to the present invention, since the fiber slurry is vacuum-formed while causing a flow difference in the fiber slurry in the vicinity of the mold surface, the entanglement of the fibers is stronger than that of the conventional pulp mold, and a thin and durable paper product is obtained. Can be obtained. Also,
In the case of an article with a flange, since the body and the flange have different strengths at the time of peeling from the mold surface, the article is easily damaged or deformed when the mold is removed. Is sprayed, the body of the paper-made article is peeled off from the body mold surface, and then the flange is peeled off.

According to the pulp mold flanged cylindrical article paper making apparatus of the present invention, paper making, dewatering and demolding can be automatically performed in one apparatus, and the production process can be simplified and shortened to increase production efficiency. And a uniform product can be obtained with a high yield. In particular, in the case of a papermaking apparatus for papermaking a cylindrical article having flanges on both sides of the body, the two mold members can be moved relatively in opposite directions along the axis, so that the mold equipment is complicated. Not
In addition, the molded article can be easily removed from the mold, and a bobbin with a flange on both sides, which has conventionally been difficult to mold with a pulp mold, can be easily formed.

By providing a shaping device having a shaping plate, it is possible to obtain a paper product having less irregularities on the outer peripheral surface other than the paper forming surface. Further, the provision of the apparatus for removing a paper product enables automatic removal of the removed paper article, thereby improving the production efficiency.
Further, by providing the chamber at the tip of the hollow shaft and providing the open end of the hollow pipe facing the bottom of the chamber, it is possible to effectively control the vacuum of the fiber slurry and the supply of pressurized air to the mold surface.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an apparatus for making a cylindrical article with a flange according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a main part showing an operation during a papermaking process.

FIG. 3 is a schematic diagram of a main part showing an operation at the start of demolding.

FIG. 4 is a schematic diagram of a main part showing an operation at the time of demolding following FIG. 3;

FIG. 5 is a schematic diagram illustrating an operation at the time of demolding when no pulp is provided.

6 is a cross-sectional view of a bobbin made by the apparatus shown in FIG.

FIG. 7 is a schematic front view of a main part of a papermaking apparatus for a cylindrical article with a flange according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Type | mold apparatus 2,61 1st type | mold member 3,62 2nd type | mold member 4,63 1st hollow shaft 6 2nd hollow shaft 9 Shaft center hole 10,67 Body type 11,65 Flange type 15 Body type surface 16 , 21 Flange-type surface 17, 18, 22 Through hole 25 Valve 26, 33 Chamber 31, 32 Pipe 36 Fiber slurry tank 38 Shaping plate 39 Clamp 41 Fiber slurry 50 Bobbin 51 Body 52, 53 Flange

Claims (13)

[Claims] In a fiber slurry, a mold member having at least a body mold surface and a flange mold surface is communicated with a vacuum source, and a flow difference is generated between the mold surface and the fiber slurry in the vicinity of the mold surface. A papermaking step of depositing fibers on a mold surface to form a paper, a dewatering step of dehydrating the mold member by positioning the mold member outside the fiber slurry liquid, and a demolding step of removing the dewatered paper product from the mold member. For making cylindrical articles with flanges. 2. The papermaking method according to claim 1, wherein a flow difference is generated in the fiber slurry near the mold surface by rotating the mold member in a fiber slurry liquid. 3. By stirring the fiber slurry liquid,
The method for producing a cylindrical article with a flange according to claim 1, wherein a flow difference is generated in the fiber slurry near the mold surface. 4. The papermaking method according to claim 1, wherein a flow difference is generated in the fiber slurry near the mold surface by injecting the fiber slurry from the nozzle near the mold surface. 5. The method according to claim 1, wherein in the demolding step, pressurized air is injected from the body mold surface to peel off the body of the paper-made article from the body mold surface and to peel the flange from the flange mold surface. A papermaking method according to any one of claims 1 to 4. 6. A fiber slurry tank for storing a fiber slurry, a mold device located in the fiber slurry tank and comprising a body mold having at least a body mold surface and a flange mold having a flange mold surface, The mold device is fixed to a hollow shaft, a through hole communicating with the hollow portion of the hollow shaft is formed in the body mold surface and the flange mold surface, and the mold surface is vacuumed or pressurized through the hollow shaft. An apparatus for producing a cylindrical article with a flange by using a pulp mold, wherein the apparatus has a structure capable of performing the same. 7. The papermaking apparatus according to claim 6, wherein said hollow shaft is connected to a rotary drive to form a rotary drive. 8. The papermaking apparatus according to claim 6, wherein a screw for stirring the fiber slurry is provided in the fiber slurry tank. 9. The papermaking apparatus according to claim 6, further comprising a valve for opening and closing a through hole formed in the flange mold surface. 10. The papermaking apparatus for a cylindrical article having a flange is a papermaking apparatus for a cylindrical article having a flange on both sides of a body, and the mold apparatus is a body type having a body mold surface and a flange mold having a flange mold surface. Comprises a first mold member integrally formed and a second mold member having the other flange mold surface, wherein the second mold member is provided so as to be relatively movable along the same axis as the first mold member. The papermaking apparatus according to claim 6, 7, 8 or 9, which is fixed to the other hollow shaft. 11. The papermaking apparatus according to claim 6, further comprising a shaping device having a shaping plate movable with respect to the body mold surface. 12. The paper-making apparatus according to claim 6, further comprising a paper-sheet taking-out device having a clamp for holding a body of the paper-made article when the paper-made article is released from the mold. 13. The hollow shaft has a large-diameter chamber at a distal end, the mold member is fixed to an open end of the chamber, and the hollow shaft is connected to a vacuum source and a pressurized air source. The papermaking apparatus according to any one of claims 6 to 12, which is connectable.