JP3289016B2 - Method for producing pulp molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pulp molded article and a papermaking mold used for the method.

[0002]

2. Description of the Related Art The prior art relating to a method for producing a pulp molded article includes the following.
For example, a technique described in Japanese Patent Application Laid-Open No. 7-3700 is known. By the way, in the above-mentioned conventional technology, a washing step of a papermaking mold is required separately from a manufacturing step of a molded body, which has been an obstacle in improving manufacturing efficiency.

Accordingly, an object of the present invention is to provide a method for producing a pulp molded article which can be washed during a production process and greatly improve production efficiency, and a papermaking mold used in the production method. I do.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a papermaking mold is formed by assembling a plurality of split dies having a papermaking net and a suction path, and after filling the pulp slurry into the cavity of the papermaking mold, the suction path is formed. After discharging the liquid component in the pulp slurry through the pulp fiber to form a wet undried molded body by depositing pulp fibers on the inner surface of the papermaking net, the undried molded body deposited on the inner surface of the papermaking net is removed. In the method for producing a pulp molded article having a dewatering step, one or more flow paths for supplying a purging fluid for cleaning the papermaking net are provided in the split mold, and the pulp slurry is supplied through the flow paths. By supplying a purging fluid from the outer surface side of the papermaking net into the cavity during filling of the pulp molded article, It is those that have achieved the above objects.

Further, the present invention is found using the manufacturing method of the pulp molded article according to claim 1, a plurality of mold parts are assembled
A papermaking mold in which a cavity is formed by being found ,
The split mold is one or more communicating the cavity and the outside.
A plurality of flow paths for purging fluid; a suction path for sucking a liquid component in the pulp slurry filled in the cavity; a papermaking net for making paper from solid components in the pulp slurry ; Supply line for purging fluid
And the supply line is located above the cavity.
While filling the pulp slurry,
A valve that is controlled to supply the purging fluid and opens and closes
The above object has been achieved by providing a papermaking mold for producing a pulp molded article having a lube .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows an embodiment of a split mold constituting a papermaking mold used in the method for producing a pulp molded article according to the present invention. In the drawing, reference numeral 1 denotes a papermaking mold, 7 denotes a supply pipe for purging fluid for washing a papermaking net 5 described later, 8 denotes a suction pipe,
70 indicates a compressor, 80 indicates a suction pump, and V1 to V8 indicate valves for opening and closing the supply pipe and the suction pipe.

As shown in FIG. 1, a papermaking mold 1 includes a plurality of flow paths 2 for purging fluid that communicate the inside and the outside of a cavity C, a manifold 3 that communicates with supply ports of these flow paths 2, A pair of split molds 10 and 11 each having a suction passage 4 (see FIG. 2) for draining liquid components in the pulp slurry filled in C and a papermaking net 5 for making paper from solid components in the pulp slurry. It is configured. Since the split dies 10 and 11 have the same basic configuration, only the split dies 10 will be described below, and the description of the split dies 11 will be omitted.

As shown in FIGS. 2 and 3, the split mold 10 is
Outer frame 100 and papermaking block 10 forming cavity C
1 and the manifold 3
Is formed by an outer frame 100 and a papermaking block 101.

The inner surface of the split mold 10, that is, the papermaking block 1
A flow groove 20 is provided on the inner surface of 01 so that the purging fluid can flow widely over substantially the entire area of the inner surface. The flow grooves 20 are formed in a vertical and horizontal lattice shape (hereinafter, the vertical flow grooves are also referred to as vertical grooves, and the horizontal grooves are also referred to as horizontal grooves).
The discharge port 21 of the flow passage 2 is provided in the vertical groove 20a. The depth of the flow groove is preferably from 0.5 to 100 mm, more preferably from 1 to 50 mm, in view of its workability, drainability, and prevention of clogging of the papermaking net. The width W of the flow groove (see FIG. 3B) is preferably 0.3 to 25 mm in view of workability, drainage, prevention of clogging of the papermaking net, and supportability of the papermaking net.
More preferably, it is set to 10 to 10 mm. The width of the groove may be different between the vertical groove 20a and the horizontal groove 20b. Further, the interval D between the grooves is preferably 0.6 to 100 mm from the viewpoints of workability, drainage, prevention of clogging of the papermaking net, and supportability of the papermaking net, and 2 to 50 m.
m is more preferable.

[0010] As shown in FIG.
On an inner surface of the paper making block 01, ridges 22 for restricting the flow of the purging fluid in the vertical direction are provided all around the inner surface of the papermaking block 101 and at predetermined intervals in the vertical direction. The vertical arrangement position of the ridge 22 is set to a position where clogging is likely to occur. Thus, the discharge port 21 and the ridge 2
By disposing 2, the purging fluid can be efficiently purged into the cavity C. The split mold itself can be formed of a material such as a metal, a resin, a rubber, and particularly a durable elastic body without swelling due to a liquid component.

Further, as shown in FIG. 1, the longitudinal grooves 20a
The depth of the lateral groove 20b is greater at the upper portion, that is, at the portion corresponding to the vicinity of the opening of the molded body than at the lower portion.
By increasing the depth of the flow groove 20 in this manner,
The volume including the flow groove 20 in the upper part of the split mold 10 is
It can be larger than the lower part. As a result, the purged fluid can escape to the circulation groove, and the water level of the pulp slurry can be kept high.

As shown in FIG. 1, the manifold 3
Is divided into five chambers (3a to 3e) by dividing walls 31 to 35 according to the height of the molded body to be molded. Also,
The room 3f is provided with the room 3f so as to be located at the bottom of the cavity C by the partition member 35. The partition member 35 includes a flow passage 36 and a suction passage 37 (see FIG. 2B).
The flow passage 36 communicates the room 3d with the room 3f, and the two suction passages 37 are two main suction passages 40 (see FIG. 2A) described later provided in the papermaking block 101. Is in communication with Supply pipes 73 to 71 are supplied to the chambers 3b, 3c, and 3d so that the purge fluid can be supplied independently.
(These supply pipes are shown only by solid lines for convenience.) These supply pipes 7
Valves 3 to 71 are provided with valves V3 to V1, respectively, so that purging fluid can be supplied to each room at a different pressure for each room. With such a configuration, for example, even if the purge fluid is supplied in the initial stage of filling in which the filling amount of the pulp slurry is small,
The purge fluid can be prevented from being intensively discharged from the discharge port not filled with the slurry, and a high cleaning effect can be obtained while maintaining the momentum of the purge fluid. In addition, the purging fluid is intensively purged at locations where clogging is likely to occur, so that the cleaning effect can be enhanced.

On the other hand, as shown in FIG. 1, a suction pipe 81 is provided in the room 3a, and drainage and exhaust are performed by the suction pipe 81 provided in the room 3a. In the process, drainage and exhaust during filling of the pulp slurry and discharge of the purging fluid, and smooth filling of the pulp slurry through the opening above the papermaking mold 1 can be performed. In room 3e,
A suction pipe 83 is provided, through which liquid components in the pulp slurry supplied into the cavity C can be discharged as described later.
Further, in the present embodiment, the supply pipe 71 is provided with a suction pipe 82.
Are connected to each other, and the room 3d can be suctioned as needed.

As shown in FIGS. 1 and 2A, the suction passage 4 is provided inside the papermaking block 101 independently of the flow passage of the purging fluid. That is, the suction path 4
Communicates with two main suction passages 40 provided in the papermaking block 101 and extending in the vertical direction. These main suction paths 40 communicate with a suction path 36 shown in FIG. 2B, and the suction path 36 communicates with a room 3e shown in FIG. The liquid component in the pulp slurry supplied into the cavity C can be discharged through the suction path 4, the main suction path 40, the suction path 36, the room 3e, and the suction pipe 83. In the present embodiment, only the suction pipe 81 is piped to the room 3a. However, by supplying a purge fluid supply pipe to the room 3a, the purge fluid can also be discharged from the room 3a.

The paper making net 5 is fixed to the inner surface of the split mold 10 with a set screw (not shown). The method for fixing the papermaking net 5 is not limited to this, and for example, the end of the papermaking net 5 may be disposed between the papermaking block and the outer frame, and the end may be fixed with a screw.

As the papermaking net 5, a net made of a natural fiber, a synthetic fiber or a metal fiber may be used singly or in combination, or a net formed by combining and knitting the above-mentioned material fibers may be used. Also,
The papermaking net 5 is preferably modified on the fiber surface in order to improve the slipperiness and durability of the net. Examples of the natural fibers include plant fibers, animal fibers, and the like.
As the synthetic fiber, a thermoplastic resin, a thermosetting resin,
Synthetic resin fibers made of semi-synthetic resin are exemplified. Also,
Examples of the metal fibers include stainless steel fibers and copper fibers.

The papermaking net 5 preferably has an average opening area ratio of 20 to 90%, and more preferably 30 to 60%, in order to prevent the net from adhering to the inner surface of the split mold and maintain good suction efficiency. Is more preferred. The papermaking net 5 preferably has an average maximum opening width of 0.05 to 1 mm in order to reliably perform papermaking while suppressing the passage of the solid component in the pulp slurry and the clogging of the net. , 0.2-
Those having a diameter of 0.5 mm are more preferable.

Although not shown in the figure, the valve V1
A flow meter (not shown) is attached to each of the pipes where V6 to V6 are provided, and the opening and closing of each valve operates according to a predetermined sequence according to the detection output of each attached flow meter. Is input to a control unit (not shown) of the molding machine main body, and is performed according to a control instruction from the control unit.

Next, a method for producing a pulp molded article of the present invention will be described as a preferred embodiment based on an embodiment using the papermaking mold 1 with reference to the accompanying drawings. In FIG. 4, the papermaking mold 1 is partially omitted for convenience.

First, as shown in FIG. 4A, the split molds 10 and 11 are assembled to form a papermaking mold 1. In this state, the valves V2, V3, and V5 are closed and the valves V7 and V8 are closed.
And V1 and V4 are opened, and the compressor 70 and the suction pump 80 are operated. Then, while the purging fluid is supplied only to the room 3d of the manifold 3, exhaust is performed from the room 3a so as not to hinder the filling of the pulp slurry.

Next, the injection pump (not shown) is started, the pulp slurry is sucked up from the pulp slurry storage tank (not shown), and the pulp slurry is filled into the cavity C from the opening above the papermaking mold 1. I do.

The pulp slurry to be filled is obtained by dissolving pulp as a main solid component in water as a liquid component to form a slurry. The solid component is pulp 10
It may be composed of 0%, or may be mixed with other solid components in addition to the pulp. In this case, the amount of the other solid components is 1 to 70% by weight, particularly 5 to 50% by weight. Other solid components include inorganic substances such as talc and kaolinite, inorganic fibers such as glass fiber and carbon fiber, powder or fiber of synthetic resin such as polyolefin, non-wood or vegetable fiber, and polysaccharides. The liquid component may be composed of 100% water, or may be mixed with other liquid components in addition to water.

During the filling of the pulp slurry, the cavity C
A purge fluid is sprayed inward. When the purging fluid passes through the papermaking net 5, the pulp clogged in the papermaking net 5 in the previous papermaking process is removed and mixed into the pulp slurry being filled. Further, as shown in FIG. 3A, the upward flow of the purging fluid through the vertical groove 20a is regulated by the ridges 22 provided in the split mold, so that the urge 22 is directed toward the inside of the cavity C. A purge fluid can be supplied well.

In this embodiment, as shown in FIG. 4A, supply pipes 71 to 73 for purging fluid in the papermaking mold 1.
The valves V1 to V3 interposed at the same time are opened at the same time, or V1, V2, V2 according to the filling amount (water level) of the pulp slurry.
It is more preferable to open as appropriate in the order of V3.

In the papermaking mold 1, since the purging fluid can be independently supplied to each of the divided rooms, the purging fluid can be discharged into the pulp slurry vigorously and without waste. Further, by providing the supply pipe and the valve, the purging fluid can be supplied at a different pressure for each room, thereby purging the locations where clogging is likely to occur intensively to enhance the cleaning effect. be able to. Furthermore, longitudinal grooves 20a, the depth of the lateral groove 20b, since the part component corresponding to the vicinity of the opening of the upper portion or the molded body are deeply Oite, bubbles are generated by purge fluid was collected into the upper portion The water level can be maintained even at a high position.
Therefore, the papermaking net 5 can be effectively cleaned.

The purge fluid to be sprayed is not particularly limited, but is preferably used in view of cost, ease of handling, and the like.
Air is most preferred. In addition, a liquid component can be discharged in addition to the air. Alternatively, the liquid component and air may be mixed and discharged. The liquid component to be mixed is not particularly limited, but it is easy to handle, the production cost is simplified, and the equipment is simplified (the same pipe can be used for the purge fluid supply pipe system and the drainage suction pipe system). From the viewpoint of the above, the liquid component of the pulp slurry is most preferable. The discharge amount and the discharge time of the purging fluid are appropriately set to appropriate amounts in which a test is performed in advance and sufficient cleaning can be performed according to the shape of the molded body to be molded.

Next, as shown in FIG. 4 (b), the valves V1 to V3 of the purge fluid supply pipe 7 and the valve V8 of the main stopper are provided.
While closing (see FIG. 1), the valves V5 and V of the suction pipe 8 are closed.
6, the inside of the cavity C is negatively sucked from the outside of the papermaking mold 1 through the suction passage 4 to reduce the pressure, and the inside of the cavity C is pressurized with air from the upper opening of the papermaking mold 1 so that the water in the pulp slurry ( The liquid component) is discharged out of the cavity C, and the pulp fibers are deposited on the inner surface of the papermaking net 5. The pressure of the air pressurization can be appropriately set according to the molded product. As described above, the portion of the papermaking net 5 corresponding to the chamber 3a of the manifold 3 is sucked for a longer time than other portions, so that this portion can be made thicker than other portions. When the pulp layer P having a predetermined thickness is formed, the injection of the pulp slurry is stopped, and the inside of the cavity C is sucked and dehydrated.

In the dehydration step, as shown in FIG.
The inside of the cavity C is suctioned and depressurized through the suction pipe 8, and a pressurized fluid is supplied into the cavity C. Examples of the pressurized fluid include air, steam, and the like.
Air is most preferred in terms of ease of handling and cost. The pressure of the supplied pressurized fluid is preferably 0.05 to 1 MPa, more preferably 0.2 to 1 MPa.

When the pulp layer P has been dehydrated to a predetermined moisture content, the valves are closed, and as shown in FIG. 4C, the papermaking mold 1 is opened to obtain a wet molded product having a predetermined moisture content. Take out the intermediate (undried molded body).

The removed intermediate is then subjected to a heating and drying step. In the heating / drying step, first, a pair of split dies (the paper making net is not provided in the split that constitutes the drying die) are abutted to form a cavity having a shape corresponding to the outer shape of the molded article to be molded. Use a dry mold. Then, the drying mold is heated to a predetermined temperature, and the wet intermediate is loaded into the drying mold. It is preferable to use a drying mold having a suction passage communicating with the inside of the cavity and the outside of the drying mold in order to improve the drying efficiency.

Next, a hollow core, which is elastic, expandable and contractible, is inserted into the intermediate body provided in the cavity. The core expands like a balloon in the cavity and presses the pulp layer against the inner surface of the drying mold cavity, thereby imparting the inner shape of the drying mold cavity and promoting the pressure drying of the pulp layer. used. The core is made of a fluorine-based rubber, silicone-based rubber, elastomer, or the like having excellent tensile strength, rebound resilience, elasticity, and the like.

Next, while suctioning and depressurizing the inside of the cavity through the suction path of the dry type, a pressurized fluid is supplied into the core to expand the core, and the pulp layer is expanded by the expanded core. Press against the inner surface of the cavity. Then, the pulp layer is pressed against the inner surface of the papermaking net by the expanded core 6, and the inner surface shape of the cavity of the dry mold is transferred to the pulp layer, and drying proceeds further. As described above, since the pulp layer is pressed against the inner surface of the drying mold cavity from the inside of the intermediate, even if the inner surface shape of the cavity is complicated, the shape of the inner surface of the cavity is accurately adjusted to the surface of the pulp layer (the outer surface). ). Further, the strength of the thick part near the upper end of the opening of the obtained molded body is sufficiently increased. In addition, unlike the conventional manufacturing method, there is no need to provide a bonding step, so that the obtained molded article does not have a seam or a thick portion due to bonding.
As a result, the strength of the obtained molded body is further increased and the appearance impression is improved. As the pressurized fluid used to expand the core, for example, compressed air (heated air),
Oil (heating oil) and other various liquids are used. Further, the pressure for supplying the pressurized fluid is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa.

When the shape of the inner surface of the cavity of the drying mold is sufficiently transferred to the pulp layer and the pulp layer can be dried to a predetermined moisture content, the pressurized fluid in the core is sucked to cause the core to shrink and shrink. The core is taken out of the cavity, the drying mold is opened, and a predetermined dried molded body is taken out.

The molded body manufactured in this manner does not particularly require a plastics member for reinforcement.
Since the production cost is low and it can be easily reused or incinerated after use, it leads to reduction of waste.

As described above, according to the papermaking mold 1 for producing a pulp molded article of the present embodiment and the method for producing a pulp molded article using the same, the production cycle is not changed during the production process of the molded article. Since the papermaking mold 1 can be washed,
The manufacturing efficiency can be greatly increased as compared with the conventional case.

FIG. 5 shows another embodiment of the papermaking mold for producing a pulp molded article of the present invention. The papermaking mold 1 'of the present embodiment has the same basic configuration as the papermaking mold 1 except that the number of divided chambers of the manifold is different, and the supply pipe, suction pipe and valve are arranged correspondingly. Therefore, in the following description, only different portions will be described, and common portions will be denoted by the same reference numerals and description thereof will be omitted. Therefore, the description of the above-described embodiment is appropriately applied particularly to the inner part of the description.

As shown in FIG. 5, in the papermaking mold 1 'of this embodiment, a branch pipe of the supply pipe 7 for the purging fluid is connected to the supply pipe 83 of the chamber 3d of the manifold 3. And
With this configuration, when filling the cavity C with the pulp slurry, the valves V7 and V8 and the valves V1 and V4 are opened and V2, V3 and V5 are closed, so that the room 3d can be opened. The purging fluid can be discharged from almost the entire surface of the cavity C through the communicating flow passage 2 and the main suction passage 40 and the suction passage 4 (see FIG. 2A) so that cleaning can be performed effectively. . Further, if necessary, by opening the valves V2 and V3, the supply area of the purge fluid can be increased. Further, when a predetermined amount of the pulp slurry is supplied into the cavity C, the valves V1 to V3 are closed, the valve V5 is opened, and the water in the pulp slurry is removed through the suction path 4 and the main suction path 40 and the room 3d. The paper can be discharged for papermaking.

The present invention is not limited to the above embodiments, and can be appropriately changed without departing from the spirit of the present invention.

The present invention, as in the above embodiment,
It is preferably used for the production of a hollow molded article by injecting pulp slurry. For example, the papermaking mold 1 is turned upside down so that the opening is directed downward, and the papermaking mold 1 is placed in a pool filled with pulp slurry. It can also be applied to the production of a pulp molded article which is immersed, suctioned and degassed and made into paper.

In the present invention, as in the above-described embodiment, it is preferable to perform dehydration by supplying a pressurized fluid (air) into the cavity during dehydration. From the point that it can be applied, dehydration can be performed using a core as shown in FIG.

That is, after forming the formed body as in the above-described embodiment (see FIG. 4A), the inside of the cavity C is suctioned through the suction pipe 8 of the paper making mold 1 as shown in FIG. While the pressure is reduced, the hollow core 6 having elasticity and expandable and contractible is inserted into the cavity C.

Next, as shown in FIG.
While the inside of the cavity C is sucked and depressurized, a pressurized fluid is supplied into the core 6 to expand the core 6, and the expanded core 6 presses the pulp layer P against the inner surface of the papermaking net 5. Thereby, the pulp layer P is pressed against the inner surface of the papermaking net by the expanded core 6, and the inner surface shape of the papermaking mold 1 is transferred to the pulp layer P, and dehydration further proceeds. In this embodiment, since the pulp layer P is pressed against the inner surface of the papermaking net from the inside of the cavity C, even if the inner surface of the papermaking mold 1 is complicated, the inner surface of the papermaking mold 1 can be precisely formed. The shape is transferred to the surface (outer surface) of the pulp layer P. As the pressurized fluid used to expand the core 6, for example, compressed air (heated air), oil (heated oil), and other various liquids are used. The pressure for supplying the pressurized fluid is 0.01 to 5 MPa,
In particular, it is preferable to make it 0.1 to 3 MPa.

When the shape of the inner surface of the papermaking mold 1 has been sufficiently transferred to the pulp layer P and the pulp layer P has been dehydrated to a predetermined moisture content, each valve is closed, and the core is removed as shown in FIG. 6. Drain the pressurized fluid in 6. As a result, the core 6 automatically shrinks and returns to its original size. Next, the contracted core 6 is taken out of the cavity C, and the papermaking mold 1 is further opened to take out a wet molded intermediate (undried molded body) having a predetermined moisture content.

In the present invention, when the undried molded article is dehydrated, the molded article can be dehydrated only by suctioning and depressurizing the inside of the cavity through the suction pipe or the opening of the papermaking mold.

The present invention can also be applied to the case where a molded article having a plurality of different types of pulp layers is molded. In this case, it is preferable to discharge the purging fluid when making the outermost layer.

In the present invention, if the purge fluid is sprayed during the filling of the pulp slurry, the start of the spray of the purge fluid is not particularly limited. Preferably, the purging fluid is discharged beforehand. Of course, the discharge of the purging fluid may be performed simultaneously with the filling of the pulp slurry or after the start of the slurry filling.

Further, in the above embodiment, the papermaking mold 1 composed of the split molds 10 and 11 provided with the suction pipe 81 provided in the room 3a as a drainage / exhaust passage for smoothly filling the pulp slurry. For example, as shown in FIG. 7, a papermaking mold 1 composed of split molds 10 'and 11' having the same configuration as the split molds 10 and 11 except that no room corresponding to the same room was provided. The member 90 provided with the pipe 90a can be disposed in the pulp slurry filling nozzle 9 to fill the pulp slurry. While the pulp slurry is supplied from the nozzle 9 inserted to a fixed position in the cavity, the pulp slurry flows in the vertical direction in the cavity by draining and exhausting the water through the pipe 90a, thereby increasing the wall thickness. While forming a uniform molded body, the molded body (hollow container)
The pulp layer can be easily deposited at a portion corresponding to the mouth and neck of the pulp.

The papermaking mold of the present invention is similar to the above embodiment in that the split mold 10 constituting the papermaking mold 1 is
It is preferable to form the manifold 3 between the outer frame 100 and the papermaking block, which is composed of the papermaking block 101 and the papermaking block 101. For example, a papermaking mold shown in FIG. In FIG. 8, the same reference numerals are given to portions common to the above-described papermaking mold, and description thereof will be omitted. Therefore, the description of the papermaking mold 1 of the above embodiment is appropriately applied to the points not particularly described.

In the papermaking mold shown in FIG. 8, a split mold 10 'constituting the papermaking mold is formed by a papermaking block 101' and a papermaking block 10 '.
1 ', and a plate-shaped surface member 102' arranged to be in contact with the back surface of the papermaking block 10 '.
A papermaking block 10 is attached to the back or surface member 102 'of 1'.
1 ′ so as to communicate with the supply port of the flow passage 2
0 'is formed, and the manifold 3' is formed by the flow groove 1020 '. The papermaking mold of this embodiment is compact and excellent in handleability, in addition to the effects of the papermaking mold of the above embodiment.

The papermaking mold of the present invention is suitable for molding a hollow cylindrical body having a bottom as in the above embodiments. For example, an elliptical cylinder having a cross section according to the shape of a container may be used. It can also be applied to the molding of a hollow molded article.

[0051]

According to the method for producing a pulp molded article of the present invention, since the papermaking mold can be washed during the production process, the production efficiency can be greatly improved as compared with the conventional method. Also,
According to the papermaking mold for producing a pulp molded article of the present invention,
The method for producing a pulp molded article of the present invention can be suitably performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a papermaking mold for producing a pulp molded article of the present invention, and is a cross-sectional view showing a state in which a split mold is combined to form a papermaking mold.

FIG. 2 is a horizontal cross-sectional view schematically showing an internal structure of a split mold constituting a papermaking mold for producing a pulp molded article of the present invention, wherein (a) is a view of one split mold taken along line AA in FIG. Sectional drawing, (b) is sectional drawing seen from the BB arrow.

3A and 3B are diagrams showing a form of a flow groove formed on an inner surface of a split mold, wherein FIG. 3A is a schematic vertical sectional view of a main part of the split die, and FIG. It is a schematic diagram.

FIG. 4 is a schematic view showing each step in the method for producing a pulp molded article of the present invention, (a) showing a slurry filling step, (b) showing a dewatering step, and (c) showing a dewatering step. It is a figure showing a mold process.

FIG. 5 is a diagram (corresponding to FIG. 1) showing another embodiment of the papermaking mold for producing a pulp molded article of the present invention.

FIGS. 6A and 6B are schematic views showing another dewatering and demolding steps in the method for producing a pulp molded article of the present invention, wherein FIG. 6A is a view showing a core inserting step, and FIG. FIG. 3C is a view illustrating a dehydration step, and FIG. 3C is a view illustrating a core removal / demolding step.

FIG. 7 is an enlarged sectional view of a main part schematically showing another embodiment of a drainage / exhaust pipe.

FIG. 8 is a cross-sectional view (corresponding to FIG. 2 (a)) of a main part of another embodiment of the papermaking mold for producing a pulp molded article of the present invention.

[Explanation of symbols]

 1: Papermaking type 2: Flow path 3: Manifold 4: Suction path 5: Papermaking net 6: Core 10, 11: Split type

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-49200 (JP, A) JP-A-9-132900 (JP, A) JP-A-7-3700 (JP, A) JP-A-11-11 342550 (JP, A) JP-B-42-9086 (JP, B1) JP-B-35-9669 (JP, B1) JP-B-38-17053 (JP, B1) US Patent 2961043 (US, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D21J 3/00-7/00

Claims (7)

(57) [Claims] 1. A papermaking mold is formed by assembling a plurality of split dies having a papermaking net and a suction path, and after filling a pulp slurry into a cavity of the papermaking mold, a liquid component in the pulp slurry is passed through the suction path. Pulp mold comprising a step of discharging pulp fibers on the inner surface of the papermaking net to form a wet undried molded body, and then dewatering the undried molded body deposited on the inner surface of the papermaking net. In the method for producing a molded article, the split mold is provided with one or more flow paths for supplying a purging fluid for washing the papermaking net, and the filling of the papermaking net during the filling of the pulp slurry through the flow paths. A method for producing a pulp molded product, comprising supplying a purging fluid from an outer surface side into a cavity. 2. The method for producing a pulp molded article according to claim 1, wherein pressurized air is supplied into the cavity to dehydrate the undried molded article formed on the inner surface of the papermaking net. 3. A et al used in the production method of the pulp molded article according to claim 1 which, a plurality of split molds are assembled key
A papermaking mold in which a cavity is formed , wherein the split mold is one or more communicating the cavity and the outside.
A plurality of flow paths for purging fluid; a suction path for sucking a liquid component in the pulp slurry filled in the cavity; a papermaking net for making paper from solid components in the pulp slurry ; Supply line for purging fluid
And the supply line is connected to the pulp slurry into the cavity.
During the filling of the cavity,
Has a valve that opens and closes controlled to supply the body
Pulp molded article production papermaking mold are. 4. A papermaking mold for producing a pulp molded article according to claim 3, wherein a flow channel for purging fluid is provided on the inner surface of said split mold. 5. The pulp mold according to claim 4, wherein said flow grooves are formed in a vertical and horizontal lattice shape, and ridges for restricting the upward flow of said purging fluid through said flow grooves are provided on the inner surface of said split mold. Papermaking mold for manufacturing molded articles. 6. The papermaking mold according to claim 5, wherein the depth of the flow groove provided in the upper part of the split mold is greater than that of the lower part. 7. A plurality of flow passages and a supply pipe are connected to each other.
The manifold is connected via a manifold, the manifold is divided into a plurality of chambers corresponding to the height of a molded body to be molded, and the purging fluid can be supplied independently for each room. 6. The papermaking mold for producing a pulp molded article according to any one of 6.