JP3289015B2 - Method for producing pulp molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing a pulp molded article.

[0002]

2. Description of the Related Art In the manufacturing process of a pulp molded article, a water-containing molded article obtained by papermaking is dewatered in order to improve handleability and shorten drying time. There is a step to do. For dehydration,
As described in JP-A-7-223230, an inner mold to which a flexible film having a shape substantially the same as the inner shape of the target molded product is adhered when inflated, and a shape substantially the same as the outer shape of the target molded product. Using an outer mold having a mold surface shape, a molding material is charged and pressed between the inner mold and the outer mold, and the molding material is pressurized and dehydrated by utilizing the expansion of the flexible film. Methods are known.

[0003] However, since the molded body in a hydrated state is fragile, in the above method, when the molding material is pinched by the outer mold and the inner mold, there is misalignment between the molds,
When the thickness unevenness of the water-containing molding material occurs, the molding material comes into contact with a mold, and the molded body may be deformed or the pulp fibers constituting the molded body may be damaged, such as falling off.

Accordingly, the present invention provides a pulp molded article which can be stably molded when the hydrated pulp molded article is dehydrated under pressure or dried under pressure under pressure. It is an object of the present invention to provide a method for producing the same.

[0005]

According to the present invention, a pulp slurry is supplied into a cavity of a papermaking mold having a cavity having a predetermined shape inside, and an opening is formed on a papermaking surface of the cavity.
A pulp molded article having the neck, which is connected to the end surface of the mouth neck <br/>, after forming a molded body composed of a separation portion having a flange, molded article body The molded body is dewatered by supplying a pressurized fluid to the mold, and the molded body is taken out of the papermaking mold, loaded into the cavity of a heating mold having a cavity of a predetermined shape, and then expanded and contracted. A possible core is inserted into the molded body from the side of the cut-off portion , and then a predetermined fluid is supplied into the core to expand the core, and the molded body is expanded by the expanded core. Is pressed against the cavity surface, and then the molded body is dried. Thereafter, the dried molded body is removed from the heating mold, and the cutoff portion of the molded body and the pulp mold are removed. In the connection portion with the molded body, A method of manufacturing a pulp molded article of cutting the form body, the mouth of the molded body, an opening
Having a neck and a torso, the diameter of the torso being larger than the diameter of the mouth and neck
Pal for molding the molded body so as to have a large shape
The object has been achieved by providing a method of manufacturing a molded article (hereinafter, referred to as the first invention).

The present invention also provides a pulp molded article having a mouth and a neck opened on a papermaking surface of a papermaking mold having a cavity therein having a predetermined shape. is connected to the end face of the port neck, after forming a molded body composed of a separation portion having a flange, disconnecting said a collapsible core
The molded body is inserted into the molded body from the side of the portion, and then a predetermined fluid is supplied into the core to expand the core, and the molded body is directed toward the papermaking surface by the expanded core. Pressing, after that, the molded body is taken out of the papermaking mold, and at a connecting portion between the cut-off portion and the pulp molded molded body in the molded body, a pulp molded body for cutting the molded body is formed. The manufacturing method , wherein the molded body
Has an open mouth and neck and a torso, and the diameter of the torso is
The molded body has a shape larger than the diameter of the mouth and neck.
The object has been achieved by providing a method for producing a pulp molded article for molding a main body (hereinafter, referred to as a pulp molded article) .
The second invention refers to this invention).

Further, according to the present invention, after a molded body having a predetermined shape is formed by a wet papermaking method, the molded body is loaded into a cavity of a heating mold having a cavity having a predetermined shape. An expandable and contractible core is inserted into the molded body, and then a predetermined fluid is supplied into the core to expand the core, and the molded core is moved to the cavity surface by the expanded core. Pressed toward, from the molded body, a pulp molded body having an open mouth and neck ,
Is connected to the end face of the port neck, and forming a separation portion having a flange, thereafter, the molded body composed of a said separation portion and the pulp molded article is taken out from the heating mold, A method of manufacturing a pulp molded article, in which the molded body is cut at a connecting portion between the cut-off section and the pulp molded article in the molded body , wherein the molded body has an open mouth and neck portion.
And a torso, wherein the diameter of the torso is larger than the diameter of the mouth and neck
Molding the molded body so as to have a shape, and
Insert the core into the molded body from the side of the separation section
The present invention provides a method for producing a pulp molded article (hereinafter referred to as the third invention).

[0008] The present invention also relates to the method of the second invention.
As because of preferred manufacturing apparatus, a paper making mold having a cavity of a predetermined shape therein, and means for supplying a pulp slurry into the cavity, is molded into the cavity
And the core can be scaled to be inserted into adult form within the body, and means for inserting the tang, and means for supplying a predetermined fluid in the tang,
Means for taking out the compact body from the papermaking mold, the molded body, and means for cutting the connecting portion between the separation portion and said pulp molded article, the Extract
The cavity of the paper mold has an open mouth and neck and a torso.
Pulp mushroom having a diameter of the trunk larger than a diameter of the mouth and neck.
Molded body, connected to the end face of the opening of the mouth and neck,
Molded book composed of a separation part having a flange
An object of the present invention is to provide an apparatus for manufacturing a pulp molded article having a shape corresponding to the outer shape of a body.

Further, the present invention relates to a method for manufacturing a semiconductor device according to the third invention.
As because of another preferred manufacturing apparatus, a heating mold having a cavity of a predetermined shape therein, means for loading the formed form body formed by a wet papermaking method to the heating type, it is inserted into the molded article body Expandable and contractible core, means for inserting the core, means for supplying a predetermined fluid into the core,
And means for taking out the molded product body from the heating mold, the molded body, and means for cutting the connecting portion between the separation portion and said pulp molded article, the heating
The cavity of the mold has an open mouth, neck and torso.
Pulp mushroom having a diameter of the trunk larger than a diameter of the mouth and neck.
Molded body, connected to the end face of the opening of the mouth and neck,
Molded book composed of a separation part having a flange
An object of the present invention is to provide an apparatus for manufacturing a pulp molded article having a shape corresponding to the outer shape of a body.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first invention will be described based on preferred embodiments with reference to the drawings. The present embodiment is an example of manufacturing a bottle-shaped pulp molded article (hereinafter, also simply referred to as a molded article) having an open mouth-neck portion and a body portion having a diameter larger than that of the mouth-neck portion. FIG. 1 (a)-
FIG. 1 (c) shows the paper making and dewatering steps of the method for producing a pulp molded article of the present invention in order, and FIG.
Fig. 1B shows a pulp slurry injection and suction dehydration step, Fig. 1B shows a dehydration step by supplying a pressurized fluid, and Fig. 1C shows a paper making mold opening step.

The manufacturing apparatus used in the manufacturing method of the present embodiment includes a papermaking mold having a cavity of a predetermined shape inside,
There is provided a means for supplying pulp slurry into the cavity, and a means for supplying a pressurized fluid supplied into the molded body formed in the cavity.

First, as shown in FIG. 1 (a), a papermaking machine is formed of a pair of split dies 2 and 3 and a cavity 4 having a predetermined shape is formed inside by combining the split dies. Prepare mold 1. The inner surface of the cavity 4 is covered with a papermaking net (not shown) having a mesh of a predetermined size. Each of the split dies 2 and 3 has a plurality of communication passages 5 communicating from the inside (that is, the inner surface of the cavity 4) to the outside.
Are formed. Each communication path 5 is connected to suction means (not shown) such as a suction pump. The cavity 4
It communicates with the outside of the papermaking mold 1 through the slurry injection path 6.

The cavity 4 includes a molded body corresponding cavity 4a corresponding to a pulp molded article having an opening, and a separation corresponding cavity corresponding to a separation connected to an end surface of the opening. Part 4b
It is composed of Molded cavity 4a
Has a shape in which a bottle-shaped pulp molded article having an opened mouth, neck, trunk, and bottom is formed.
The cavity 4b corresponding to the separation portion has a shape in which a separation portion 7 having a flange 7c protruding laterally and a rising portion 7d rising from the periphery of the flange 7c is formed. A rib 11 is provided at the boundary between the molded body corresponding cavity portion 4a and the separation portion corresponding cavity portion 4b.
Are formed. The rib 11 is formed over the entire circumference of the cavity 4 and has an annular shape. The rib 11
Its cross section is triangular.

In this state, a filling nozzle 12 is inserted into the slurry injection path 6, and a predetermined amount of pulp slurry is injected into the cavity 4 through the filling nozzle 12. At the same time, the inside of the cavity 4 is sucked under reduced pressure through the communication path 5 toward the outside of the papermaking mold 1 to suck moisture in the pulp slurry and to put pulp fibers on the papermaking surface, that is, on the papermaking net covering the inner surface of the cavity 4. Deposit. As a result, a water-containing molded body 7 formed by depositing pulp fibers is formed on the papermaking net. At this time, the molded body 7
At the initial stage and / or at the end stage of forming, a predetermined amount of water (diluting water) is pressurized and injected into the cavity 4 to dilute the concentration of the pulp slurry in the cavity 4 so that the thickness unevenness of the molded body 7 is reduced. It can be suppressed effectively. The initial stage of formation refers to a state in which the pulp supplied into the cavity 4 is 30% or less, particularly 20% or less of the whole pulp required for molding. The final stage of the formation means that the pulp supplied into the cavity 4 accounts for 70% or more of the whole pulp required for molding, particularly 8%.
It means a state of 0% or more. The supply amount of the dilution water is preferably such that the concentration of the pulp slurry is reduced to 80% or less, particularly 20 to 60%.

As shown in FIG. 1A, the molded body 7 comprises a pulp molded body 7a having an opening and a separating portion 7b connected to an end face of the opening. An annular concave portion 13 having a shape corresponding to the rib 11 formed on the inner surface of the cavity 4 of the papermaking mold 1 is formed at a connecting portion between the pulp molded body 7a and the separating portion 7b. The concave portion 13 is used for positioning the cutting of the pulp molded body 7a and the separating portion 7b, which will be described later.

The filling nozzle 12 is used as a means for supplying pulp slurry and a pressurized fluid described later. The filling nozzle 12 includes a driving plate 12a, a nozzle 12b vertically penetrating the driving plate, a three-way valve 12c attached to the upper end of the nozzle 12b, a slurry supply pipe 12d connected to the three-way valve 12c, and a pressurized fluid supply, respectively. A tube 12e is provided. By switching the three-way valve 12c, the nozzle 12b is alternatively connected to the slurry supply pipe 12d and the pressurized fluid supply pipe 12e. When the pulp slurry is injected into the cavity 4, the nozzle 12b is connected to the slurry supply pipe 12d. In addition, the driving plate 12a is
, Whereby the slurry injection path 6 is closed.

In molding the molded body 7, molding is performed so that the pulp molded body 7a constituting one of the molded bodies has a bottle-like shape having an opened mouth, neck, body, and bottom. Also, molding is performed so that the separated portion 7b constituting the other side is formed with a flange 7c that protrudes laterally and a rising portion 7d that rises from the peripheral edge of the flange 7c.

The formed body 7 is subjected to a dewatering step. First, as shown in FIG. 1B, the papermaking mold 1 is sucked from the inside to the outside through the communication path 5. Under this condition, the three-way valve 12c is switched to connect the nozzle 12b to the pressurized fluid supply pipe 12d while keeping the filling nozzle 12 fixed at the position at the time of papermaking, and a pressurized fluid supply source (not shown) To supply a predetermined pressurized fluid into the cavity 4.
As described above, the interior of the cavity 4 is airtight because the slurry injection path 6 is closed with the driving plate 12a. Here, the airtight state does not mean a state in which the inside of the cavity 4 is completely airtight, but means a state in which the inside of the cavity 4 is airtight by blowing of a pressurized fluid to a pressure equal to or higher than a pressure described later. . The blown pressurized fluid passes through the molded body 7 and is discharged to the outside through the communication path 5.

As the pressurized fluid, for example, steam or superheated steam (hereinafter, both are collectively referred to as steams) can be used, and it is particularly preferable to use superheated steam. By blowing the steam, the temperature of the water contained in the molded body 7 instantaneously rises due to condensation heat transfer by the steam, and the viscosity and surface tension of the water can be reduced.
Moisture held in the molded body 7 is instantaneously blown off very efficiently. As a result, the dewatering efficiency can be improved. Since this dehydration method does not mainly involve heat exchange, it is a very energy-efficient method. In addition, since the dehydration is completed instantaneously, the dehydration time can be reduced. Since a core made of an elastic material used in a heating and drying step described later is not used for dehydration, a machine time for inserting the core into the cavity is not required, and the machine time can be reduced. Further, since the blowing pressure is lower than the pressure for press dewatering, there is an advantage that a trace of the papermaking net is hardly formed on the surface of the obtained molded body 7 and a molded body having a good appearance can be obtained.

The pressure in the cavity 4 is 98 k
Pa or more, especially 196 kPa or more, especially 294 kP
It is preferable that the air is blown so as to be not less than a. It is preferable that the pressure in the cavity 4 due to the blowing is higher than the above-mentioned value, but it is more preferable. However, since the degree of water removal gradually becomes saturated with an increase in the blowing pressure, the upper limit of the economically viable pressure is increased. Is about 980 kPa.
The pressure in the cavity 4 refers to a difference between an inlet pressure and an outlet pressure of steam into the cavity 4.

The above-mentioned dilution water supplied into the cavity 4 at the time when the slurry remains in the cavity 4 or at the end of the formation of the molded body 7 remains in the cavity 4 when the steam is blown. It is preferable to perform from the point of time.
Thereby, the water in the cavity 4 is forcibly discharged out of the mold, and the drainage time is shortened. The blowing time of the steam is preferably 2 to 20 seconds, particularly preferably about 3 to 15 seconds.
Dehydration is completed in a very short time. By this dehydration,
For example, a molded body having a water content of 75 to 80% by weight before dehydration is dehydrated to about 40 to 70% by weight.

When using superheated steam as steam,
It is sufficient that the superheated steam is heated so that the internal pressure of the mold becomes equal to or higher than the above-mentioned value and the steam is not condensed until just before the steam is blown into the mold. The steam may be sufficiently heated, but the dewatering effect does not change significantly.

As the pressurized fluid used for dewatering the molded body 7, compressed air can be used in addition to the above-mentioned steams. By blowing the compressed air, moisture is instantaneously removed from the wet molded body 7 by a physical mechanism that does not mainly perform heat drying by heat exchange. The compressed air has a pressure in the cavity 4 of 196 kP.
It is preferable that the gas is blown at a pressure of at least a, especially at least 294 kPa. The upper limit of the pressure is about 1471 kPa for the same reason as in the case of steams. The blowing time of the compressed air is preferably 10 to 60 seconds, particularly preferably 15 to 40 seconds. The pressure (original pressure) of the compressed air is not particularly limited as long as the mold internal pressure is equal to or higher than the above-described value. Regarding the points which are not particularly described in the compressed air, the description in detail regarding the steams is appropriately applied.

Either one of the steam and the compressed air may be used, but it is preferable to use a combination of both from the viewpoint of dehydration efficiency. In particular, it is preferable to blow compressed air after blowing steam. The reason for this is that if the blowing time of the steam is long, there may be a large difference in the distribution of the water content in the vertical direction of the molded body 7. This is because it is effective to blow compressed air after sufficiently raising the temperature of the water contained in the molded body. When steam and compressed air are blown in this order, the pressure of the steam is 98 kPa or more,
Especially at 196 kPa or more, especially at 294 kPa or more,
The blowing time is preferably 2 to 20 seconds, particularly 3 to 15 seconds, while the pressure of the compressed air is 196 kPa or more, especially 294 kPa or more, and the blowing time is 2 to 25 seconds, especially 5 to 20 seconds. preferable. It is preferable that the blowing of the steam and the compressed air be continuous from the viewpoint of dehydration efficiency.

When the molded body 7 can be dehydrated to a predetermined moisture content, the supply of the pressurized fluid is stopped, and the filling nozzle 12 is taken out of the papermaking mold 1 as shown in FIG. Next, the papermaking mold 1 is opened, and the molded body 7 dehydrated to a predetermined moisture content is taken out using predetermined handling means.

The removed molded body 7 is then subjected to a heating and drying step. 2A to 2C sequentially show a heating and drying step. FIG. 2A shows a core insertion step, FIG. 2B shows a heating and drying step, and FIG. ) Is a step of opening the heating mold. FIG. 2D shows a cutting step of the molded body after drying.

In the heating and drying step, a heating die having a cavity of a predetermined shape inside, a means for loading the molded body 7 formed by the papermaking mold 1 into the heating mold,
Expandable and contractible core inserted into the core, means for inserting the core, means for supplying a predetermined fluid into the core, means for removing the molded body 7 from the heating mold, And a means for cutting the pulp molded body 7a at a connecting portion between the pulp molded body 7a and the separating section 7b.

First, a heating mold 21 in which a cavity 24 having a shape corresponding to the outer shape of a molded body to be molded is formed separately by combining a pair of split molds 22 and 23, and the heating mold 21 is fixed to a predetermined shape. Heat to temperature. In the present embodiment, the cavity shape of the heating mold 21 and the cavity shape of the papermaking mold are the same. Therefore, similarly to the papermaking mold 1, the heating mold 21 corresponding to the connecting portion between the cutoff portion 7b of the molded body 7 and the pulp molded body 7a.
A rib 27 is formed at a portion on the inner surface of the cavity. A water-containing molded body dehydrated to a predetermined moisture content is loaded into the heated mold cavity by using a predetermined handling means. No net is arranged on the inner surface of the cavity 24. Each split mold 22 and 23 has
A plurality of communication paths 25 communicating from the inside (that is, the inner surface of the cavity 24) to the outside are formed. Each communication passage 25
Is connected to a suction means (not shown) such as a suction pump. The cavity 24 communicates with the outside of the heating mold 21 through the core insertion path 26.

Next, as shown in FIG.
Under the state where the heating die 21 is sucked from the inside to the outside through the core 5, the hollow bag-shaped core 8 is inserted into the core insertion path 26.
, And is inserted into the molded body 7 from the side of the separating portion 7b . The core 8 is used for pressing and drying the molded body 7.

A cut-out portion 7b of the molded body 7 is provided with a flange 7c that projects laterally in the paper making process.
Are formed. Therefore, even if the core 8 is inserted into the molded body 7 in a state where the core 8 is displaced and the core 8 is in contact with any part of the molded body 7, the flange 7 c protruding laterally is formed. Exerts the locking action of the pulp fiber, and the pulp fiber at the portion in contact with the core 8 is effectively prevented from being pushed down together with the core 8.
As a result, the core 8 can be efficiently inserted into the molded body 7 without causing deformation or damage to the pulp molded body 7a. The locking action by the flange 7c is
If the rising portion 7d is formed on the peripheral edge of c, it becomes more effective.

By forming the molded body 7 so that the cut-off portion 7b is formed, it is advantageous even when performing multilayer papermaking. Specifically, when a molded article is manufactured by multilayer papermaking, slurry mixing tends to occur near one end of the molded article, and a clear multilayer structure may not be formed near the end in some cases. In the present invention, by forming the separation portion 7b connected to the pulp molded article 7a as an object together with the object, the separation portion 7b becomes a buffer region for mixing the slurry, and the separation portion 7b is formed.
Even if a clear multilayer structure is not formed in b, a stable multilayer structure is formed in the pulp molded article 7a. As a result, the yield is improved.

Further, by forming the molded body 7 so that the separation portion 7b is formed, the separation portion 7b can be used as a grip portion in a later step, and there is an advantage that handling properties are improved. .

The support member 10 of the core 8 is inserted into the core 8. The support member 10 is composed of a cylindrical pipe. A large number of apertures 10 are provided on the side of the support member 10.
a is formed. The lower end 10b of the support member 10 is open, and a projection 8b of a predetermined shape formed on the inner surface of the lower end of the core 8 is fitted into the lower end 10b,
The core 8 is fixed to the support member 10. As a result, the core 8 is supported by the support
Is inserted into. As a result, the core 8 can be inserted into the molded body 7 in a stable state, and the core 8 can be more efficiently inserted into the molded body 7 without further deforming or damaging the pulp molded body 7a. Can be inserted in. Further, the expansion of the core 8 described later can be performed uniformly, and the molded body 7 can be uniformly dried under pressure.

As shown in FIG. 2A, the core 8 and the support member 10 are inserted into the molded body 7 while being fixed to the fixing portion 9 as an insertion means of the core 8. In FIG.
The detailed structure of the fixing part 9 is shown.

As shown in FIG. 3, the fixing portion 9 includes a driving plate 9
a, a pressure bush 9b and a holder 9c.

The driving plate 9a has a flat plate shape, and a through hole is formed in the center thereof. The diameter of the through hole is substantially the same as the diameter of the support member 10. The support member 10 is inserted and fixed in the through hole. An annular groove is formed in the side wall of the through hole, and an O-ring 9d is mounted in the annular groove. The O-ring 9d maintains airtightness between the through hole and the support member.

The pressure bush 9b has a cylindrical shape, and has a flange portion 9e projecting laterally at an upper portion thereof. The open upper portion of the hollow bag-shaped core 8 is sandwiched and fixed between the upper surface of the flange portion 9e and the lower surface of the driving plate 9a.

The holder 9c holds the flange 9e of the pressure bush 9b by being fixed to the driving plate 9a by a fixing screw 9f.

The core 8 is made of a material that can be expanded and contracted. In the present invention, the expansion and contraction means that the volume of the core 8 changes due to expansion and contraction, and that the core 8 itself does not expand and contract, but the fluid is supplied to or removed from the interior to reduce the volume. Is changed.
Examples of the former are natural rubber, urethane, fluorine-based rubber,
Examples include a core made of an elastic material such as a silicone rubber or an elastomer.Examples of the latter include plastic materials such as polyethylene and polypropylene, films in which aluminum or silica is deposited on a film of these plastic materials, Films, papers, etc. in which aluminum foil is laminated on a plastic material film
A core made of a flexible material such as cloth may be used.
In the present embodiment, an elongated bag-shaped (balloon-shaped) core made of a stretchable elastic material is used as the core 8.

As shown in FIG. 2B, when the insertion of the core 8 is completed, the lower end of the core 8 is located near the bottom of the molded body 7. In this state, a predetermined pressurized fluid is supplied into the support member 10 from a supply source (not shown) as a pressurized fluid supply means, as shown in FIG. The supplied pressurized fluid is supplied to the inside of the core 8 via the opening 10 a formed on the side surface of the support member 10. Further, the split dies 22, 23 are sucked from the outside together with the supply of the pressurized fluid. This causes the core 8 to expand.

The molded body 7 is expanded by the expanded core 8.
It is pressed toward the inner surface of the cavity 24. Thereby, the drying of the molded body 7 proceeds and the molded body 7
The shape of the inner surface of the cavity 24 is transcribed. Further, since the molded body 7 is pressed from the inside toward the inner surface of the cavity 24, even if the shape of the cavity 24 is complicated, the shape of the inner surface of the cavity 24 is accurately transferred to the molded body 7. Will be. Further, it is possible to easily manufacture a deep-bottom molded body in which the side wall of the trunk rises substantially vertically. As the fluid used to expand the core 8, for example, air (pressurized air), hot air (heated pressurized air), superheated steam, oil (heated oil), and other various liquids are used. In particular, using air, hot air, and superheated steam
It is preferable in terms of operability and the like. The pressure at which the fluid is supplied is
It is preferably 0.01 to 5 MPa, particularly preferably 0.1 to 3 MPa.

When the molded body is sufficiently dried, the fluid in the core 8 is drained, and the core 8 is reduced to its original size as shown in FIG. Next, the reduced core 8 is taken out of the molded body 7 together with the support member 10, the heating mold 21 is opened, and the molded body is taken out by a predetermined handling means.

Next, as shown in FIG. 2 (d), the molded body 7 taken out of the heating mold is fixed at a connecting portion between the separation portion 7b and the pulp molded body 7a in the molded body 7 at a predetermined position. Is cut off by the cutting means, and the separation portion 7b and the pulp molded body 7a are separated. As a result, the target pulp molded article 7a
Is obtained. As the cutting means, for example, a rotary blade is used. As described above, the connecting portion is provided with the rib 1 of the papermaking mold 1.
Since the annular concave portion 13 having a shape corresponding to 1 is formed, it is easy to position the rotary blade at the time of cutting, and it is possible to suppress the occurrence of defective products due to a cutting error. The separated portion 7b is reused as a raw material of the molded body.

Next, the second invention will be described based on a preferred embodiment thereof with reference to FIGS. 4 (a) to 4 (d). For the second invention, only the points different from the first invention will be described, and for the points which are not particularly described, the detailed description regarding the first invention will be appropriately applied. FIG.
4A to 4D, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals. This embodiment is an example of manufacturing a bottle-shaped molded body having an opened mouth and neck portion and having a trunk portion larger in diameter than the mouth and neck portion, similarly to the first invention. FIG.
4A to 4D sequentially show the paper making and dewatering steps of the method for producing a pulp molded article of the present invention. FIG. 4A shows the pulp slurry injection and suction dewatering steps.
(B) is a core insertion step, FIG. 4 (c) is a pressure dehydration step,
FIG. 4D shows the step of opening the papermaking mold.

The manufacturing apparatus used in the manufacturing method of the present embodiment includes a papermaking mold having a cavity of a predetermined shape therein,
Means for supplying pulp slurry into the cavity, an expandable and contractible core inserted into a molded body formed in the cavity, insertion means for the core, and a predetermined fluid in the core. And a means for removing the molded body from the papermaking mold.

First, as shown in FIG. 4A, a predetermined amount of pulp slurry is injected into the cavity 4 of the papermaking mold 1 through a slurry injection path 6 by a pulp slurry supply means (not shown). At the same time, the inside of the cavity 4 is suctioned under reduced pressure through the communication path 5 toward the outside of the papermaking mold 1.
The moisture in the pulp slurry is sucked and the pulp fibers are deposited on the papermaking surface, that is, on the papermaking net covering the inner surface of the cavity 4. As a result, a water-containing molded body 7 is formed on the papermaking net, which is composed of the pulp mold molded body 7a having an opening and the separating portion 7b connected to the end face of the opening. In this case, similarly to the first invention, a predetermined amount of dilution water is injected under pressure into the cavity 4 at the initial stage and / or at the end stage of the formation of the molded body 7 to dilute the concentration of the pulp slurry in the cavity 4. You may.

The formed molded body 7 is subjected to a pressure dehydration step. First, as shown in FIG.
While the papermaking mold 1 is being sucked from the inside to the outside through the core 8, the molded body 7
Insert inside. The core 8 is the same as that used in the first invention. However, it is not necessary that the material, the shape, and the like be exactly the same. In the first invention, the core 8 is used for pressing and drying the molded body after dehydration. However, the core 8 is used for pressurized dehydration of the molded body 7 here.

Prior to the insertion of the core 8, when the slurry remains in the cavity 4 or at the end of the formation of the molded body 7, the above-mentioned dilution water supplied into the cavity 4 remains in the cavity 4. At this point, a pressurized fluid such as compressed air may be blown into the cavity 4 to force the water in the cavity 4 out of the mold. When blowing compressed air, the pressure and time can be the same as the pressure and time of compressed air used in the dehydration step in the first invention.

In the second invention, as in the first invention,
A flange 7c that protrudes laterally is formed at a separation portion 7b of the molded body 7. Therefore, for example, even when the core 8 is inserted into the molded body 7 in a state of being in contact with any part of the molded body 7 when the core 8 is inserted, the pulp molded body 7a is not deformed or damaged. The core 8 can be efficiently inserted into the molded body 7 without giving. In particular, the molded body 7 after papermaking has a lower strength because of a higher moisture content than the molded body 7 after dehydration, and the core 8
Although it is easy to be deformed or damaged even by slight contact with the flange, deformation and damage can be effectively prevented by forming the flange 7c.

The support member 10 of the core 8 is inserted into the core 8. The core 8 and the support member 10 are shown in FIG.
As shown in (1), the core is inserted into the molded body 7 while being fixed to the fixing portion 9 as an insertion means of the core. Support member 10
The details of the fixing portion 9 are the same as those of the first invention.

As shown in FIG. 4C, when the insertion of the core 8 is completed, the lower end of the core 8 is located near the bottom of the molded body 7. In this state, a predetermined pressurized fluid is supplied into the support member 10 from a supply source (not shown) as a pressurized fluid supply unit as shown in FIG. The split dies 2 and 3 are sucked from the outside together with the supply of the pressurized fluid. This causes the core 8 to expand.

The molded body 7 containing water is pressed by the expanded core 8 toward the papermaking surface, that is, the inner surface of the cavity 4. As a result, the pressurized dehydration of the molded body 7 proceeds, and the inner surface shape of the cavity 4 is transferred to the molded body 7. The fluid used to expand the core 8 and the supply pressure thereof can be the same as in the first invention.

When the molded body 7 can be dewatered to a predetermined moisture content and the shape of the inner surface of the cavity 4 has been sufficiently transferred to the molded body 7, the fluid in the core 8 is drained, and as shown in FIG. Thus, the core 8 is reduced to the original size. Then
The reduced core 8 is taken out of the molded body 7 together with the support member 10, and the papermaking mold 1 is further opened to take out the molded body 7 dehydrated to a predetermined moisture content by a predetermined handling means.

The removed molded body is then subjected to a heating and drying step. The heating and drying step is the same as in the first invention. The dried molded body is taken out of the heating mold and cut in a concave portion which is a connecting portion between the cutoff portion and the pulp molded body in the molded body in the same manner as in the first invention.

Next, the third invention will be described. In the third invention, only points different from the first and second inventions will be described, and the same points will not be particularly described. However, the detailed description of the first invention is appropriately applied.

In the third invention, first, a molded body having a predetermined shape is formed by a predetermined wet papermaking method. As the wet papermaking method, in addition to the papermaking method used in the first invention and the second invention, a conventionally known papermaking method can be appropriately used. The shape of the molded body is not particularly limited, but is preferably a shape close to the shape of the molded body composed of the pulp molded body and the cutoff portion, which is formed in a heating and drying step described later.

The molded article body formed by the wet papermaking method is then subjected to a predetermined dehydration step. As the dehydration method, a dehydration method using a pressurized fluid used in the first invention,
In addition to the pressure dehydration method using the core used in the second invention,
A conventionally known pressure dehydration method can be appropriately used. By the dehydration, the molded body is dehydrated to a moisture content that allows easy handling.

The molded body dehydrated to a predetermined moisture content is then subjected to a heating and drying step. In the heating and drying step, a heating mold having a cavity having a target shape and a shape corresponding to a molded body composed of a pulp molded body and a cut-off portion is used. As this heating type, for example, the same type as the heating type used in the first invention and the second invention can be used.

[0059] in the cavity, after loading the shaped body that has been dewatered to a prescribed water content, the collapsible core,
Inserting into the molded body from the side of the cut-off portion , then supplying a predetermined fluid into the core to expand the core, and using the expanded core to direct the molded body toward the cavity surface And press. As the core and fluid used at this time, the same ones as those used in the first invention and the second invention can be used.

The molded body is pressed against the cavity surface by the pressing by the core. As a result, the pressed pulp molded body forms a pulp molded body having an opening and a cutoff part having a flange connected to the end face of the opening, and heat drying proceeds. The shape and the like of the flange can be the same as those of the first invention and the second invention. Thereafter, in the same manner as in the first invention and the second invention, the separation portion and the pulp molded product are separated, and a target pulp molded product is obtained.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the rising portion 7d is formed on the periphery of the flange 7c of the separation portion 7b. However, if the pulp fiber locking action by the flange 7c is sufficient, the rising portion 7d is formed. You don't have to. Although the flange 7c is formed in the horizontal direction, it is tapered (inclined upward).
It may be formed.

The flange 7c may be discontinuous as long as the pulp fiber locking function is sufficiently exhibited.

In the drying step, a core larger than the opening of the molded article may be used in order to improve the durability of the core during repeated use. Also in this case, since the molded body dehydrated to a predetermined moisture content has a high strength, deformation or damage of the pulp molded body can be suppressed even when the core touches the flange. As a result, it is possible to omit the step of shrinking the core before inserting it into the molded body, thereby shortening the machine time.

In the above embodiment, a set of papermaking molds 1 is composed of two split molds 2 and 3, but three or more split molds are used depending on the shape of the molded product. A mold may be configured. The same applies to the heating type.

In the above embodiment, the continuous annular rib 11 is formed in the papermaking mold and the drying mold. However, the rib 11 may be formed discontinuously. In that case, the concave portion 13 formed in the molded body corresponding to the rib 11 also becomes discontinuous.

The contents of the above embodiments can be replaced with each other as appropriate.

The production method of the present invention is particularly effective for producing a bottle-shaped molded product, but is similarly applied to the production of a box-shaped carton-shaped molded product, a cushioning material, and a molded product of other shapes. be able to. Furthermore, in addition to the shape of the container used to store the contents, the present invention can be applied to the manufacture of molded articles of various shapes that are free in design such as objects such as ornaments.

[0068]

According to the method for producing a molded pulp molded article of the present invention, deformation or damage of the molded article is prevented when dehydrating or drying the hydrous molded article under pressure, and stable molding can be achieved. It becomes possible. Further, when performing multilayer papermaking, a stable multilayer structure can be formed in the pulp molded article, and the yield can be improved. Further, the handleability of the pulp molded article in the manufacturing process can be improved.

[Brief description of the drawings]

1 (a) is a pulp slurry injection and suction dehydration step, FIG. 1 (b) is a dehydration step by supplying a pressurized fluid, and FIG. 1 (c) is a step of opening a papermaking mold.

2 (a) shows a core insertion step, FIG. 2 (b) shows a heating drying step, and FIG. 2 (c) shows a heating mold opening step. FIG. 2D shows a cutting step of the molded body after drying.

FIG. 3 is a diagram illustrating details of a fixing unit.

4 (a) is a pulp slurry injection and suction dehydration step, FIG. 4 (b) is a core insertion step, FIG. 4 (c) is a pressure dehydration step, and FIG. 4 (d) is a papermaking mold. This is the step of opening.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 papermaking mold 2, 30 split mold 4 cavity 4a molded body corresponding cavity part 4b separation part corresponding cavity part 5 communication passage 6 slurry inflow path 7 molded body 7a pulp molded body 7b separation part 7c flange 7d rising part 8 core 9 Fixing part 10 Support member 11 Rib 12 Filling nozzle 21 Heating mold 22, 23 Split mold 24 Cavity 25 Communication passage

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroaki Kobayashi 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Prefecture Inside Kao Co., Ltd. References JP-A-11-314267 (JP, A) JP-B-47-1565 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21J 3/00-7/00

Claims (11)

(57) [Claims] 1. A by supplying the pulp slurry in the papermaking mold of said cavity having a cavity inside into a predetermined shape, the papermaking surface of the cavity, the pulp molded article having an open mouth and neck, the mouth neck is connected to the end face of the section, after forming a molded body composed of a separation portion having a flange, inserting the collapsible core within the molded article body from the side of the separation portion, then intermediate A predetermined fluid is supplied into the core to expand the core, and the expanded core presses the molded body toward the papermaking surface, and then the molded body is removed from the papermaking mold. A method of manufacturing a pulp molded article, wherein the molded body is cut at a connection portion between the cut-off section and the pulp molded article in the molded body , wherein the molded body is opened.
It has a mouth neck and a torso, and the diameter of the body is smaller than the diameter of the mouth and neck.
The molded body is formed so as to have a larger shape.
A method for producing a pulp molded article . 2. A support member is inserted into the core, a predetermined portion of the core is fixed to a predetermined portion of the support member, and the core is supported by the support member. The method for producing a pulp molded article according to claim 1, wherein the molded article is inserted into the molded article main body. 3. A supply pulp slurry in the papermaking mold of said cavity having a cavity inside into a predetermined shape, the papermaking surface of the cavity, the pulp molded article having an open mouth and neck, the mouth neck is connected to the end face of the section, after forming a molded body composed of a separation portion having a flange, dehydrated molded product body to supply pressurized fluid to the molded article body, the molded article The main body is taken out of the papermaking mold, loaded into the cavity of the heating mold having a cavity having a predetermined shape inside, and then the expandable and contractible core is inserted into the molded body from the side of the cutoff portion. Then, a predetermined fluid is supplied into the core to expand the core, and the molded body is dried while the molded body is pressed toward the cavity surface by the expanded core. ,
After that, the dried molded body is taken out of the heating mold, and at a connecting portion between the cutoff portion and the pulp molded body in the molded body, a pulp molded body for cutting the molded body is cut. A manufacturing method ,
The molded body has an open mouth and neck and a torso,
As the diameter of the body portion is larger shape than the diameter of the mouth and neck
Manufacture of a pulp molded body for molding the molded body
How . 4. The molded body according to claim 1, wherein the pulp molded body is formed into a bottle shape having the opened mouth, neck, body, and bottom. A method for producing the pulp molded article according to the above. 5. The method for producing a pulp molded article according to claim 1, wherein the molded body is formed such that a rising portion rising from a peripheral edge thereof is formed on the flange. 6. A molded body having a predetermined shape is formed by a wet papermaking method, and then the molded body is loaded into a cavity of a heating mold having a cavity having a predetermined shape. Child is inserted into the molded body,
Then it dilates the tang for supplying a predetermined fluid in the tang, and presses the molded article body to the cavity surface by extended tang, from the molded body, and open mouth
A pulp molded article having a neck, which is connected to the end face of the port neck, and forming a separation portion having a flange, the composed thereafter, the pulp molded article and the separation portion the molded body was taken out from the heating mold, the connecting part of the separation portion and said pulp molded article in the compact body, met manufacturing method of the pulp molded article of cutting the molded body
The molded body has the open mouth, neck, and trunk.
Then, the diameter of the trunk becomes larger than the diameter of the mouth and neck.
To form the molded body, and cut the core
Pulp model inserted into the molded body from the side of the separating part
Manufacturing method of a molded product . 7. The pulp molded article according to claim 1,
A manufacturing apparatus for used in the production method, a paper making mold having a cavity of a predetermined shape therein, and means for supplying a pulp slurry into the cavity, is inserted into the formed form the molded body in the cavity A core that can be expanded and contracted; a means for inserting the core; a means for supplying a predetermined fluid into the core; a means for removing the molded body from the papermaking mold; and means for cutting the connecting portion between the separation portion and said pulp molded article, the paper type said cavity is open ended neck and torso
A pallet having a portion, the diameter of the trunk being larger than the diameter of the mouth and neck
And an end face of an opening of the mouth and neck portion.
And a separated part having a flange.
An apparatus for manufacturing a pulp molded article having a shape corresponding to the outer shape of the shaped body. 8. The apparatus for manufacturing a pulp molded article according to claim 7 , wherein the cavity of the papermaking mold has a shape in which a rising portion rising from a peripheral edge of the flange at the cut-off portion is formed. 9. The pulp molded article according to claim 5,
A manufacturing apparatus for use in manufacturing process, a heating mold having a cavity of a predetermined shape therein, means for loading the formed form body formed by a wet papermaking method to the heating type, in the molded article body An expandable and contractible core to be inserted; means for inserting the core; means for supplying a predetermined fluid into the core; means for removing the molded body from the heating mold; , and means for cutting the connecting portion between the separation portion and said pulp molded article, the heated mold the cavity of, open ended neck and torso
A pallet having a portion, the diameter of the trunk being larger than the diameter of the mouth and neck
And an end face of an opening of the mouth and neck portion.
And a separated part having a flange.
An apparatus for manufacturing a pulp molded article having a shape corresponding to the outer shape of the shaped body. 10. A papermaking mold having a cavity having a predetermined shape therein, means for supplying pulp slurry into the cavity, and supply of a pressurized fluid supplied into the molded body formed in the cavity. The apparatus for manufacturing a pulp molded article according to claim 9, further comprising: means. 11. The apparatus for manufacturing a pulp molded article according to claim 10 , wherein the cavity of the papermaking mold has a shape in which a rising portion rising from a peripheral edge of a flange at a separation portion is formed.