JP2002146700A - Method for producing pulp mold molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a pulp mold molding, with which a molding having excellent surface smoothness and excellent appearance can be readily produced. SOLUTION: This method for producing a pulp mold molding comprises inserting an elastically deformable mold having a pulp layer 4 on the surface and a communication route through which the inside is allowed to communicate with the outside into a recessed part 5a of a female mold 5 having the recessed part 5a in a shape corresponding to the external shape of a molding 6 in such a way that the bottom of the pulp layer 4 is brought into contact with the bottom part of the recessed part 5a, the elastically deformable mold is pressed and deformed so as to make the mold follow the shape of the recessed part 5a, the shape of the recessed part 5a is transferred to the pulp layer 4, the pulp layer 4 is heated and dried, water contained in the pulp layer 4 is discharged through the inside of the mold to the outside of the mold to make the molding 6.

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 which can easily produce a molded article having excellent surface smoothness and good appearance.

[0002]

2. Description of the Related Art A drying mold used for drying a water-containing molded article formed by a pulp molding method has a ventilation path for discharging water and steam out of the mold. Are formed.

However, when a conventional drying mold is used, the shape of the air passage is transferred to the surface of the molded body in a convex shape, and the appearance of the molded body is impaired. Further, depending on the shape of the molded product, the molded product may be damaged at the time of release from the mold, or pulp fibers may adhere to and accumulate in the ventilation path, so that the dry mold must be washed frequently.

Accordingly, an object of the present invention is to provide a method for producing a pulp molded article which can easily produce a molded article having excellent surface smoothness and exhibiting a good appearance.

[0005]

According to the present invention, there is provided a female mold having a concave portion having a shape corresponding to the outer shape of a molded product, the concave portion having a pulp layer on the surface and a communication passage communicating from the outside to the inside. An elastically deformable mold is inserted so that the bottom of the pulp layer is in contact with the bottom of the recess, and the mold is pressed and deformed so as to follow the shape of the recess, and the shape of the recess is formed in the pulp layer. Transferring the pulp layer by heating and drying the pulp layer, and discharging the moisture contained in the pulp layer through the inside of the mold to the outside of the mold to provide a method of manufacturing a pulp molded article to form a molded article. The purpose has been achieved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. In FIG.
1 is a longitudinal sectional view of a papermaking mold 1 used in a first embodiment of a method for producing a pulp molded article of the present invention.
The present embodiment relates to the manufacture of a box-shaped molded body having an opening. A papermaking mold 1 used in the present embodiment includes a core 10, a fluid-permeable material 2 covering the outer surface of the core 10.
0, an extending portion 30 extending horizontally from the upper side surface of the core 10, and surrounding the side surface of the core 10 at a position above the core 10 and immediately below the extending portion 30, and extending horizontally. A flange 40 made of a rigid body is provided.

The core 10 has an outer shape slightly smaller than the outer shape of the molded body to be molded. However, the height of the core 10 is larger than the height (depth) of the molded body.
The core 10 is made of an elastically deformable material.
Examples of such materials include rubber-based materials such as silicone rubber, flexible rubber, and urethane rubber. The upper center of the core 10 is an open space, and the hollow chamber 1
1 are formed. When the papermaking mold 1 is used, the hollow chamber 11
Is connected to a suction means (not shown) such as a vacuum pump.
Each side surface and bottom surface that form the outer surface of the core 10 has a network-like uneven pattern.

On the inner surface of the hollow chamber 11, a plurality of fluid communication passages 12 communicating from the hollow chamber 11 to the outside of the core 10 are formed. The fluid communication passage 12 is formed radially from the inner surface of the hollow chamber 11 to the outside of the core 10. The fluid communication passage 12 is open on the outer surface of the core 10, and the number of the openings is 1 to 4 per cm ² , in particular, 1 on the outer surface.
The formation of two or more pieces is preferable from the viewpoint of the dehydration efficiency of the pulp layer described later and the point that the strength of the core 10 is sufficiently maintained when the core 10 is elastically deformed and presses the pulp layer. Further, the fluid communication passage 12 has a cross section having such a size that passage of fluid is not hindered even when the core 10 is elastically deformed by pressing.

When the papermaking mold 1 is assembled, the hollow chamber 11, the fluid passage hole 12, and the fluid-permeable material 20 communicate with each other to form a communication passage communicating from outside to inside of the papermaking mold 1. .

[0010] The fluid permeable material 20 covers the side surfaces and the bottom surface of the core 10 in close contact with the surface shape thereof. As described above, since the outer surface of the core 10 has a mesh-like uneven pattern, the fluid-permeable material 20
Even when the outer surface of the core 10 is tightly covered, a predetermined space exists between the fluid-permeable material 20 and the outer surface of the core 10. In addition, the fluid permeable material 20 is
Is also covered. Therefore, pulp fibers accumulate on the respective side surfaces and the bottom surface of the core 10 and the lower surface of the flange 40 in a paper making process described later.

The fluid permeable material 20 is formed of a stretchable material that can be deformed following the elastic deformation of the core 10. Further, the fluid-permeable material 20 can form a fluid flow passage in the thickness direction. This flow passage is used to discharge water and steam from the pulp layer to the outside of the papermaking mold 1 when the pulp layer described later is dehydrated and dried. Therefore, it is necessary for the flow passage to flow the fluid without being crushed even when the fluid-permeable material 20 is pressed and deformed as the papermaking mold 1 is pressed. From this viewpoint, it is preferable that the fluid-permeable material 20 is made of a material that is thick and elastic and has fluid flowability. Specifically, the fluid-permeable material 20 has a thickness of 0.1 to 10 mm in a state where the outer surface of the core 10 is covered,
In particular, it is preferably 1 to 3 mm. In addition, the stretchability (extensibility) in a state where the outer surface of the core 10 is covered is 5 to 5.
Preferably it is 50%, especially 10-30%.

The fluid-permeable material 20 also functions as a papermaking net when forming a pulp layer. Therefore, the fluid-permeable material 20 has a mesh that allows moisture in the pulp slurry to pass but does not allow pulp fibers to pass. The size of this mesh is 20-100 mesh, especially 40-60 mesh
Mesh is preferred from the viewpoint of moldability of the pulp layer and prevention of clogging of pulp fibers. The fluid permeable material 20 has an average open area ratio of 10 to 80%, particularly 20 to 40%, in a state where the fluid permeable material 20 is tightly coated on the outer surface of the core 10.
% Is preferred in terms of water absorption, air permeability and strength.

Considering the above points comprehensively, those preferably used as the fluid-permeable material 20 include knitted fabrics, woven fabrics and nonwoven fabrics, and in particular, knitted fabrics are used in view of stretchability (stretchability). Is preferred.

The extending portion 30 has a rectangular shape in plan view, and is made of a material that can be elastically deformed similarly to the core 10. The constituent material of the extension 30 and the constituent material of the core 10 may be the same or different. Further, the extension portion 30 may be formed by extending the upper portion of the core 10 horizontally outward, or a member different from the core 10 may be fixed to the core 10 by predetermined means at the upper portion of the core 10. May be used.

The flange 40 has a rectangular shape in plan view, and has the same outer shape as the extension 30. An opening having the same shape as the cross-sectional shape of the core 10 is formed in the flange 40. When assembling the papermaking mold 1, the core 10 is inserted into the opening of the flange 40, and then the flange 40 is raised,
The upper surface is brought into contact with the lower surface of the extension 30. Then, the flange 40 is fixed to the extension portion 30 by a predetermined means.

A through hole 41 is formed in the flange 40 in the plane direction. The through hole 41 is formed in the core 10
The fluid communication passage 12 is formed in the fluid communication passage 12. Further, the through hole 41 is connected to a suction means (not shown) such as a vacuum pump when the papermaking mold 1 is used.

The flange 40 is made of a rigid body such as metal, ceramics, resin, etc., and does not substantially deform even when an external force is applied. Thereby, as described later, when a flange portion is formed on the molded body, the finished state of the flange portion is improved.

Next, a method of manufacturing the pulp molded article of the first embodiment using the papermaking mold 1 will be described. FIG. 2 shows the respective steps in the method for producing a pulp molded article of the present embodiment in order. Specifically, (a) is a paper making step, (b) is a pulling-up step of a paper making mold, and (c) is Inserting the papermaking mold into the female mold, (d) pressing the papermaking mold,
(E) Step of taking out the papermaking mold, (f) shows the step of taking out the molded body.

First, as shown in FIG. 2A, a papermaking mold 1 is immersed in a container 3 filled with a pulp slurry 2.
While the papermaking mold 1 is immersed in the pulp slurry 2, the papermaking mold 1 is sucked from outside to inside by suction means (not shown) such as a pump connected to the suction pipe 32. The suction is performed through the communication path described above. That is,
Moisture in the pulp slurry 2 is sucked through the communication path, and a water-containing pulp layer formed by depositing pulp fibers is formed on the surface of the papermaking mold 1, that is, the surface of the fluid-permeable material 20. As described above, since a predetermined space exists between the outer surface of the core 10 and the fluid-permeable material 20 and the flow of water is ensured, the pulp fiber is deposited smoothly and uniformly. A pulp layer having an appropriate thickness is formed. As described above, the core 10 is made of a material that can be elastically deformed. In addition to this, it is preferable that the core 10 has such a rigidity that it is not deformed by the suction.

The pulp slurry 2 may be composed of pulp fiber and water, or in addition thereto, an inorganic substance such as talc or kaolinite, an inorganic fiber such as glass fiber or carbon fiber, a synthetic resin powder such as polyolefin or the like. Components such as fibers, non-wood or vegetable fibers, and polysaccharides may be contained. The compounding amount of these components is 1 to 70% by weight, particularly 5 to 5% by weight based on the total amount of the pulp fiber and the components.
Preferably it is 50% by weight. The pulp fibers are preferably wood pulp such as softwood or hardwood or non-wood pulp such as bamboo or straw. The length and thickness of the pulp fiber are 0.1 mm or more and 10 mm or less, respectively.
It is preferable that it is not less than mm and not more than 0.05 mm.

When a pulp layer having a predetermined thickness is formed, the papermaking mold 1 is pulled out of the pulp slurry as shown in FIG.
The moisture content is set to a predetermined value. Pulp layer 4 after suction dehydration
Has a water content of 60 to 95% by weight, particularly 60 to 80% by weight.
Is preferable in that the pulp layer 4 can be sufficiently held on the surface of the papermaking mold 1 by suction, and that the papermaking mold 1 can be transported without falling off the held pulp layer 4.

When the pulp layer 4 can be sucked and dehydrated to a predetermined moisture content, the papermaking mold 1 on which the pulp layer 4 is formed is shaped into a shape corresponding to the outer shape of the molded article to be molded, as shown in FIG. Is inserted into the concave portion 5a of the female mold 5 having the open concave portion 5a, and the pulp layer 4 is subjected to pressure dehydration, shape imparting, and heat drying in the concave portion 5a. In this embodiment, the female mold 5 is 1
Composed of two members, the shape of the molded object to be molded (for example, a complex shape or a shape with an undercut)
May be combined to form a female mold.

The female mold 5 is preheated to a predetermined temperature by a heating means 5b such as an electric heater. Further, the inner surface of the concave portion 5a of the female mold 5 is not provided with an air passage for discharging the water generated from the pulp layer 4, that is, water or steam, and the inner surface is made smooth. Further, the surface of the female mold 5 on which the molded body is molded (in the present embodiment, the concave portion 5a of the female mold 5).
A ventilation hole 5c is formed in the peripheral surface). Blow hole 5c
Is connected to an air supply (not shown).

The insertion is performed such that the bottom of the pulp layer 4 first comes into contact with the bottom of the concave portion 5a of the female die 5. Then Figure 2
As shown in (d), the papermaking mold 1 is pressed with a predetermined pressure. In the pressing, the extending portion 30 in the papermaking mold 1 is pressed by a predetermined means. As described above, since the extension portion 30 is made of an elastically deformable material, pressing the extension portion 30 uniformly presses the core 10.

By this pressing, the core 1 in the papermaking mold 1 is
No. 0 is pressed and deformed so as to follow the shape of the concave portion 5a of the female mold 5, and completely fills the space of the concave portion 5a. As a result, the pulp layer 4 formed on the surface of the papermaking mold 1 is further dewatered under pressure, and the inner surface shape of the concave portion 5a is transferred to the pulp layer 4. The pulp layer formed on the lower surface of the flange 40 in the papermaking mold 1 is pressed between the lower surface and the upper surface of the female mold 5. This portion becomes a flange portion in the obtained molded body. As described above, since the flange 40 is formed of a rigid body and is not substantially deformed by the pressing, the pressing is uniformly and effectively performed, and the finished state of the flange portion is improved.

While maintaining the pressed state of the papermaking mold 1, the papermaking mold 1
Is suctioned by the suction pipe 32. As described above, the flow path in the fluid-permeable material 20 disposed on the outer surface of the papermaking mold 1 allows the fluid to flow without being crushed even under the pressed state of the papermaking mold 1. The contained water is discharged out of the papermaking mold 1 through the flow passage and the inside of the core 10 (that is, the fluid communication passage 12 and the hollow chamber 11 formed in the core 10). Water vapor generated by drying the pulp layer 4 is also discharged out of the papermaking mold 1 through the same route. Furthermore, by sucking through the through holes 41 (see FIG. 1) formed in the flange 40, dehydration and drying of the pulp layer 4 are further promoted.

The pulp layer 4 is dried while the pressing state of the papermaking mold 1 is kept for a predetermined time to obtain a pulp molded article as an object. Next, the pressing of the papermaking mold 1 is stopped. As a result, as shown in FIG. 2 (e), the core 10 of the papermaking mold 1 returns to the shape before pressing, and the obtained pulp molded article 6 is released from the surface of the papermaking mold 1 and the concave portion of the female mold 5 is formed. 5a
Stay within. Next, the papermaking mold 1 is taken out of the molded body 6.
After taking out the papermaking mold 1, the surface of the female mold 5 from which the molded body 6 is molded (in the present embodiment, the peripheral surface of the concave portion 5 a of the female mold 5) is directed toward the molded body 6 through the ventilation hole 5 c of the female mold 5. And blow air. As a result, a gap is formed between the surface and the outer surface of the molded body 6, and the molded body 6 is released from the female mold 5. Further, as shown in FIG. 2 (f), the pulp molded product 6 is taken out from the recess 5a.

The pulp molded article 6 thus manufactured is a box-shaped hollow molded article having an opening, and has a flange portion extending outward from the periphery of the opening. .

According to the present embodiment, since the female mold 5 is not provided with an air passage for discharging water or water vapor out of the mold, the surface of the pulp molded article 6 becomes smooth, Has an extremely good appearance. Further, in forming the flange portion of the molded body, since the pressing is performed between the lower surface of the flange 40 formed of a rigid body and the upper surface of the female die 5, the finished state of the flange portion is improved. Further, when the molded body 6 is taken out from the female mold 5, air is blown from the molding surface of the molded body 6 toward the molded body 6, so that the molded body 6 is released from the female mold 5 extremely smoothly. .

Next, second and third embodiments of the present invention will be described with reference to FIGS. In the second and third embodiments, only differences from the first embodiment will be described, and as to the same points as in the first embodiment, the detailed description of the first embodiment will be applied as appropriate. 3 to 6, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals.

The difference between the second embodiment and the first embodiment is the internal structure of the core 10 in the papermaking mold 1. Specifically, as shown in FIG. 3, two hollow chambers 11 a and 11 b are formed inside the core 10 with a partition wall 15 therebetween. Each of the hollow chambers 11a, 11b is filled with a large number of fillers 14, 14,... Having a predetermined shape so as to fill the hollow chambers. Fluid can be circulated between the packings. Each hollow chamber 11a, 1 filled with the filling body 14
The upper portion of 1b is closed by a flexible mesh member 13, which prevents the filler 14 from jumping out of the papermaking mold 1.

Like the papermaking mold used in the first embodiment, the fluid communication passage 12 is also formed in the papermaking mold used in the present embodiment. However, the path length of the fluid communication path 12 in the papermaking mold used in the present embodiment is shorter than that of the fluid communication path in the papermaking mold used in the first embodiment. Therefore, when the papermaking mold 1 is pressed and deformed in the concave portion 5a of the female mold 5, the fluid communication passage 12 is crushed and hardly closed, and the dewatering and drying of the pulp layer can be performed more smoothly.

The filling body 14 filled in each of the hollow chambers 11a and 11b is made of a material having a higher compression elastic modulus than the material of the core 10.
This is preferable because the flow of the fluid between the fillers 14 is ensured even during the pressing deformation. In particular, it is preferable to use aluminum, steel, copper, or the like as a material of the filler 14 from the viewpoint of pressure resistance and heat conductivity.

The shape of the filler 14 is not particularly limited, and may be any shape as long as the fluid can flow between the fillers when the hollow chamber is filled. For example, a spherical or polyhedral shape is used. Further, an irregular shape may be used. Further, a hollow shape such as a cylindrical shape may be used.

FIGS. 4A and 4B show a third embodiment.
As shown in FIG. 6, the present invention relates to the production of a molded body 6 in which flange portions 6b extending outward from the peripheral edges of the openings of a plurality of hollow containers 6a are connected to each other. In the present embodiment,
Four hollow containers 6a can be obtained by one molding,
A so-called four-piece molded body 6 is manufactured. In FIG.
A cross-sectional view of a main part of a papermaking mold 100 used for manufacturing such a molded body 6 is shown, and the figure shows a part for molding one of four hollow containers 6a.

The papermaking mold 100 used in this embodiment is
A flat papermaking plate 110 having a plurality of through holes 111 formed at predetermined intervals, an upper plate 120 disposed above the papermaking plate 110, and an upper plate 1
A large number of cores 13 that are fixed to the lower surface of the paper 20 and are inserted into the through holes 111 from the upper surface of the papermaking plate 110.
0 and a fluid-permeable material 140 that covers the lower surface of the papermaking plate 110.

The paper making plate 110 is made of a rigid body, and has a hollow inside. Paper making plate 1
The lower surface of 10 is a flat surface, and a number of fluid communication holes 112 are formed from the lower surface to communicate with the internal cavity. The papermaking plate 110 has a communication passage 113 communicating from the cavity to the outside. Communication passage 113
Is connected to a suction means (not shown) such as a vacuum pump.

The fluid permeable material 140 covering the lower surface of the paper making plate 110 is the same as that used in the first and second embodiments. Therefore, the fluid permeable material 140 can form a fluid flow path in the thickness direction even when the fluid permeable material 140 is pressed and deformed. Also, the fluid permeable material 140
Has elasticity enough to be sufficiently extended when the core 130 is inserted into the through hole 111 of the papermaking plate 110.

The core 130 has substantially the same configuration as the core in the papermaking mold used in the second embodiment, and has two hollow chambers 131a and 131b inside the core 130.
Are formed with a partition 132 therebetween, and each hollow chamber 131 is formed.
a, 131b contain a large number of fillers 133, 133,.
Is filled so as to fill the hollow chamber. The upper portions of the hollow chambers 131a and 131b are closed by a mesh member 134 having flexibility.

The upper portion of the core 130 is fitted and fixed to the lower surface of the upper plate 120. In the upper plate 120, a communication passage 121 is formed for communicating the inside of the core 130 and the outer surface of the upper plate 120 when the upper plate 120 and the core 130 are fitted. The communication path 121 is connected to a suction unit (not shown) such as a vacuum pump, like the communication path 113 formed in the paper making plate 110.

The upper plate 120 is slidably connected to the paper making plate 110 by a number of connecting guides 122 (two shown in FIG. 5). The connection guide 122 is fitted in the coil spring 123,
The upper plate 120 and the paper making plate 110 are connected. Then, the core 130 fixed to the lower surface of the upper plate 120 by sliding of the upper plate 120 is removably fitted into the through hole 111 of the paper making plate 110.

A method for manufacturing a pulp molded article of the present embodiment using the papermaking mold 100 will be described with reference to FIG. In FIG. 6, (a) shows a process of inserting a core,
(B) is a papermaking process, (c) is a papermaking mold lifting process,
(D) is a step of inserting into a female mold, (e) is a step of pressing a papermaking mold, (f) is a step of pulling out a core, (g) is a step of taking out a papermaking mold, and (h) is a step of taking out a molded body. Show.

First, as shown in FIG. 6A, the upper plate 120 is pushed down, and the core 130 is moved to the paper making plate 1.
The paper making plate 110 is inserted into the through hole 10 and protrudes from the lower surface of the paper making plate 110. The fluid-permeable material 140 expands with the protrusion of the core 130, and the outer surface of the projecting core 130 is covered with the fluid-permeable material 140.

The upper plate 120 is pushed down to the lowest point, so that the core 130 projects a predetermined amount. The protrusion amount is set to be larger than the depth of a concave portion 150a of the female die 150 described later. Next, as shown in FIG. 6B, the papermaking mold 100 is immersed in the container 3 filled with the pulp slurry 2. Under this condition, the communication path 121 in the upper plate 120
(See FIG. 5) and communication path 1 in papermaking plate 110
13 (see FIG. 5), the core 130 and the papermaking plate 110 are sucked from the outside to the inside, and a pulp layer in a water-containing state is formed on the surface of the fluid-permeable material 140.

When a pulp layer having a predetermined thickness is formed, the papermaking mold 100 is removed from the pulp slurry 2 as shown in FIG.
The pulp layer 4 is dehydrated by pulling it up from the inside and subsequently sucking to make the water content thereof a predetermined value.

Next, as shown in FIG. 6D, the portion of the papermaking mold 100 on which the pulp layer 4 is formed, from which the core 130 protrudes, is placed in the recess 150a of the female mold 150 having a large number of recesses 150a. insert. The insertion is performed so that the bottom of the pulp layer 4 formed on the outer surface of the core 130 first contacts the bottom of the recess 150a. The recesses 150 a are arranged in the same arrangement as the core 130. The female mold 150 is heated to a predetermined temperature in advance. Further, on the inner surface of the concave portion 150a of the female mold 150, there is not provided an air passage for discharging water or steam, and the inner surface is made smooth. Further, a ventilation hole 150b is formed in a surface of the female die 150 facing the paper making plate 110 (that is, a surface on which the molded body is formed).

Next, as shown in FIG.
00 is pressed with a predetermined pressure. Due to this pressing, the core 130 of the papermaking mold 100 is brought into contact with the recess 150 of the female mold 150.
By pressing and deforming so as to follow the shape of a, the space of the concave portion 150a is completely filled. As a result, the pulp layer 4 formed on the outer surface of the core 130 is further dewatered under pressure, and the inner surface shape of the recess 150a is transferred to the pulp layer 4 to form the hollow container 6a in the obtained molded body 6. In addition, the pulp layer 4 formed on the lower surface of the papermaking plate 110 in the papermaking mold 100 is pressed between the lower surface and the upper surface of the female mold 150 to form a flange portion 6b of the obtained molded body 6.

The communication passage 121 in the upper plate 120 (see FIG. 5) and the communication passage 113 in the paper making plate 110 (see FIG. 5) while the pressing state of the papermaking mold 100 is maintained.
, The core 130 and the paper making plate 110 are sucked from the outside to the inside, and the moisture (water and steam) contained in the pulp layer 4 is passed through the fluid-permeable material 140.
Discharge outside 00.

The pressed state of the papermaking mold 100 is maintained for a predetermined time, and the pulp layer 4 is dried to obtain a pulp molded article 6 as an object. Next, as shown in FIG.
The upper plate 120 is pulled up while the papermaking plate 110 is in contact with the female mold 150, and the core 130 is pulled out from the through hole of the papermaking plate 110. With this drawing, the fluid permeable material 1 covering the outer surface of the core 130
40 contracts. As a result, the hollow container 6 a in the molded body 6 is released from the surface of the fluid-permeable material 140.

Next, as shown in FIG.
0, and the entire molded body 6 is fluid-permeable material 1
Release from the surface of 40. Further, air is blown toward the molded body 6 through the blow hole 150b of the female die 150. As a result, a gap is formed between the outer surface of the female mold 150 and the outer surface of the molded body 6, and the molded body 6 is released from the female mold 150.
Finally, the pulp molded article 6 is taken out from the female mold 150 as shown in FIG.

Also in this embodiment, the surface of the pulp molded article 6 becomes smooth, as in the above-described embodiment.
The appearance of the molded body 6 becomes extremely good. Also, the molded body 6
In this case, the finished state of the flange portion 6b is good.
Further, the release of the molded body 6 from the female mold 150 is performed extremely smoothly.

The present invention is not limited to the above embodiments.
For example, each of the above embodiments relates to the production of a box-shaped molded article having an opening, but the production method of the present invention is applied to the production of molded articles of various shapes, for example, caps, spoons, lids, and the like. You can also.

[0053]

According to the method for producing a pulp molded article of the present invention, a pulp molded article having excellent surface smoothness and exhibiting good appearance can be easily produced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a papermaking mold used in a first embodiment of a method for producing a pulp molded article of the present invention.

FIG. 2 is a process diagram schematically showing each process in the first embodiment of the method for producing a pulp molded article of the present invention.

FIG. 3 is a longitudinal sectional view (corresponding to FIG. 1) of a papermaking mold used in a second embodiment of the method for producing a pulp molded article of the present invention.

FIGS. 4 (a) and (b) are a perspective view and a cross-sectional view taken along line AA of a molded body manufactured by a third embodiment of the method for manufacturing a pulp molded body of the present invention.

FIG. 5 is a longitudinal sectional view showing a main part of a papermaking mold used in a third embodiment of the method for producing a pulp molded article of the present invention.

FIG. 6 is a process chart schematically showing each step in a third embodiment of the method for producing a pulp molded article of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 papermaking mold 2 pulp slurry 4 pulp layer 5 female mold 5 a recess 6 pulp molded article 10 core 20 fluid permeable material

Claims (3)

[Claims] An elastically deformable mold having a pulp layer on the surface and a communication passage communicating from the outside to the inside of the female mold having a recess having a shape corresponding to the outer shape of the molded body,
The pulp layer is inserted so that the bottom of the pulp layer is in contact with the bottom of the recess, the mold is pressed and deformed so as to follow the shape of the recess, and the shape of the recess is transferred to the pulp layer, and the pulp layer is And heating and drying the pulp layer to discharge moisture contained in the pulp layer through the inside of the mold to the outside of the mold to form a molded pulp molded article. 2. The production of a pulp molded article according to claim 1, wherein air is blown from a surface of the female mold on which the molded article is molded to the molded article to release the molded article from the surface. Method. 3. The method for producing a pulp molded article according to claim 1, wherein an air passage for discharging steam is not provided on an inner surface of the female mold, and the concave surface is smooth.