JP2002069900A - Method for producing formed article having complicate shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet process for forming an article having a complicate shape in high efficiency. SOLUTION: A slurry having a Canadian standard freeness of >=550 ml is supplied to a mold having a mold cavity corresponding to a form obtained by developing a part of the objective formed material having complicate form. Water used as the medium of the slurry is removed through small holes of the forming mold to deposit the fine component of the slurry incapable of passing the small hole in the forming mold to obtain a wet formed material. The formed material is dried and the developed part is raised to obtain the objective material having three-dimensional shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a very efficient wet molding method for a thick molded article having severe irregularities.

[0002]

2. Description of the Related Art Styrofoam, which is most widely used as a cushioning material for packaging, has an excellent shock buffering property, can be easily processed into an arbitrary shape, is inexpensive, lightweight, and has a good appearance. It has certain features. However, in recent years, as interest in environmental issues has increased, as with other so-called plastic products, there has been an increasing demand for post-use treatment. In other words, it has been pointed out that in the case of incineration after use, damage to the furnace and generation of toxic gas due to high temperature are pointed out. In addition, landfill disposal has no decomposability and is bulky, which is considered to be one of the causes of shortage of disposal sites.

As a solution to the problem in the processing of styrofoam, the inventors of the present invention have stated, "Before filing the present application, the inventors removed water, which is a medium of slurry, from small holes of a mold having a large number of small holes. And depositing the fine pore-impermeable fine components in the slurry into a mold by using the slurry having a Canadian Standard Freeness (CSF) of 550 ml or more of the slurry composition to form a wet molded product. Various methods have been proposed for a method for producing a molded article obtained by drying the molded article in or out of the mold, and a pulp-based low-density molded article having a large thickness and excellent buffering properties obtained by the method. It also discloses that hot air can be efficiently dried by passing the hot air through the deposited layer.

[0004]

However, molded articles obtained by the above-mentioned wet method also dry faster and are superior in productivity in comparison with the conventional molding method, but the thickness of the deposited layer is extremely high depending on the location. In the case of a molded body with different irregularities, the drying is slow because the thick part of the deposited layer is extremely difficult to pass hot air compared to the thin part, and if the drying of the thick part is not improved, the productivity is poor and the cost is high. Had the problem of becoming An object of the present invention is to provide a manufacturing method capable of efficiently producing a thick molded body having severe irregularities.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method for efficiently producing a molded article having extremely irregularities in which the thickness of a deposited layer is extremely different depending on the location by the above-mentioned wet method at low cost. The present inventors have found out that this can be achieved by forming a thick portion of a deposited layer of a formed body in a developed form, and have completed the present invention. That is, the present invention supplies a slurry having a Canadian standard freeness (CSF) of 550 ml or more in a mold having a molding cavity corresponding to a shape obtained by developing a part of the concavo-convex formed body, By removing water which is a medium of the slurry from the pores of the mold, the pore-impermeable fine components in the slurry are deposited in the mold to form a wet molded article,
Subsequently, the molded product is dried, and a developed portion is further raised to obtain a shape before development, which is a method for producing an uneven molded product. In particular, it is preferable that the molding die is a concave molding die having a large number of small holes in the wall surface and one surface of which is open.
Further, when forming a molded article in a wet state, it is preferable to deposit the material over the open surface of the mold, and to cut off the unnecessary portion accumulated beyond the open surface of the mold before the drying step.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto. In addition, although it demonstrates using a pulp slurry here,
The raw material of the present invention is not limited to this. FIG.
FIG. 1 is a perspective view of a packaging cushioning material 10 having a concave portion for storing and protecting a product. The packaging cushioning material 10 includes a bottom surface 11 and four side wall surfaces 12. FIG. 2 is a perspective view of the concave mold 13 used to obtain the cushioning material 10 for packaging, and has a molding cavity corresponding to the cushioning material. FIG. 3 shows A of the concave mold 13 of FIG.
It is sectional drawing in the -A line. 4 to 9 show the concave mold 1.
3 is a cross-sectional view illustrating an embodiment of a comparative example of the present invention performed using No. 3. As shown in FIG. 3, the mold 13 to be used is of a concave shape with an open top having a double wall composed of an inner wall 14 and an outer wall 15.
In addition, a suction chamber 17 is formed by an inner and outer double wall,
A suction port 18 is attached to the bottom of the outer wall.

[0007] As shown in FIG. 4, a molding step is to place a hopper 1 serving as an enclosure for slurry storage on the molding die 13.
The pulp slurry 21 having good drainage is supplied from the upper guide 20 and the hopper 19 is filled up to the upper part of the hopper 19 in this state. Next, FIG.
As shown in FIG. 3, the pulp sediment 2 is sucked and dehydrated from the suction port 18 at the lower part of the mold 13 so that
2 are formed. At that time, the deposition is performed in a state of rising on the open surface of the mold 13. Next, as shown in FIG. 6, the hopper 19 is removed, and then, as shown in FIG. 7, an unnecessary portion of the wet pulp deposit 22 protruding from the mold opening surface is cut off by the tip saw 24. Subsequently, FIG.
Is set on the drying device 25 as shown in FIG.
Drying is performed by sending hot air from the hot air port 26 while sucking the air. At this time, the hot air flowing out of the small holes 27 passes through the sedimentary layer of the pulp deposit 22 in a wet state and deprives the moisture, but as the thickness of the sedimentary layer increases, the resistance increases and it is difficult to reach the lower part 28 of the sediment 22. It takes time to dry. FIG. 9 is a cross-sectional view of the cushioning material for packaging 10 taken out of the concave mold after the drying process.

In the present invention, in order to efficiently manufacture the packaging cushioning material 10 of FIG. 1 by shortening the drying time, the four side wall surfaces 12 of the packaging cushioning material 10 are developed into a flat structure. Is first formed, and then the side wall surface 12 is raised to assemble and fix to obtain the packaging cushioning material 10. FIG. 10 is a plan view showing an expanded side wall surface 29, and FIG. 11 is a cross-sectional view taken along line BB. FIG.
FIG. 13 is a cross-sectional view of a concave mold having a molding cavity corresponding to the developed shape 29. FIGS. 13 to 19 are cross-sectional views showing an embodiment of the present invention performed using the concave mold 13. FIG. As shown in FIG. 12, the mold 13 to be used has a concave shape of an open top having a double wall composed of an inner wall 14 and an outer wall 15.
In addition, a suction chamber 17 is formed by an inner and outer double wall,
A suction port 18 is attached to the bottom of the outer wall.

The molding process starts with mounting a hopper 19, which is an enclosing frame for slurry storage, on the molding die 13 as shown in FIG. 13, and in such a state, has better drainage than the upper guide 20. The pulp slurry 21 is supplied and is filled up to the upper part of the hopper 19. Next, as shown in FIG. Is formed. At that time, the deposition is performed in a state of rising on the open surface of the mold 13. Next, as shown in FIG. 15, the hopper 19 is removed, and then, as shown in FIG. 16, an unnecessary portion of the wet pulp deposit 22 protruding from the mold opening surface is cut off by the tip saw 24. Subsequently, the drying device 25 is set on the upper side as shown in FIG.
Drying is performed by sending hot air from the hot air port 26 while sucking from the suction port 18. At that time, small hole 2
The hot air from 7 passes through the sedimentary layer of the pulp deposit 22 in a wet state and deprives it of moisture. However, unlike the case of FIG. 8 of the comparative example, there is no thick part of the sedimentary layer, so that the drying is extremely fast. The molded article 29 in the developed state shown in FIG.
By raising and fixing the side wall surface 12, it is easy to
The packaging cushioning material (10 in FIG. 19) which is exactly the same as that described above is obtained. An adhesive is used to fix the assembled shape.

[0010] The present invention is effective for increasing the efficiency of production of a molded article having severe irregularities in which the thickness of the deposited layer is extremely different depending on the location. As the irregular molded article, a concave part for accommodating and protecting commodities is used. In addition to the above cushioning material for packaging, a side pack (a cushioning material for accommodating one side of a product) that can be used in substantially the same shape, a corner pad (for a corner portion) 30 as shown in FIG. An L-shaped pad (for a corner) 31 as shown in FIG. 21 or the like can be given as a specific example. In the case of the corner pad of FIG. 20, it is developed as shown in FIG. 22, and in the case of the L-shaped pad of FIG. 21, it is developed as shown in FIG. However, the present invention is not limited to this. In addition, among the uneven | corrugated molded objects of this invention, as shown in FIG.
4 is lightweight and particularly preferred. In this case, the data is developed as shown in FIG.

The molding die used for producing the molded article of the present invention is not particularly limited, but it is an excellent molding die in that the slurry can easily enter into the details of the molding die, and the molded product is less likely to generate voids. A concave mold having a large number of small holes on one wall and one surface being open is preferred.
As a material for the molding die, a material known in the pulp mold industry can be used, and usually, a metal material such as iron or aluminum is used. As a molding die, a mold having a 15-200 mesh wire mesh attached to the surface of a mold having small holes is usually used. It is not always necessary to use the same wire mesh as the entire surface. For example, different types such as a low mesh on the bottom surface and a high mesh on the side surface can be used in combination. Also, the metal mesh need not necessarily be applied to the entire surface of the mold, but may be applied to only a part of the surface of the mold. As the small hole of the mold, a circular hole having a diameter of 1 to 10 mm is usually used, and a small hole of the same size may be provided on the entire surface of the mold. It is common to change. As a normal mold, it is preferable to increase the opening ratio as it goes deeper, but it is preferable to provide a large number of small holes in the place where the opening ratio is to be increased, and to provide a small hole in a portion where the opening ratio is to be lowered. It is common to provide small holes. Further, a mold having a draft angle (taper) of 1 to 5 ° is usually used so that the molded body can be easily taken out.

In the present invention, a slurry composition having a filterability of 550 ml or more, which is a Canadian standard freeness, capable of efficiently forming a molded article having a thick sedimentary layer is used as the slurry composition. When a molded article is used as a buffer, a natural organic polymer fiber is usually preferably used as a main raw material. But,
In the present invention, the fibers, coarse powder, and fine particles composed of synthetic organic polymers, fibers, coarse powder, and fine particles composed of semi-synthetic organic polymers, and coarse particles composed of natural organic polymers are also not limited thereto. Powders / fine particles, fibers composed of inorganic substances, coarse powders / fine particles, and fibers composed of organic-inorganic composite materials
Coarse powder, fine particles and the like can be mentioned, and can be appropriately selected according to the use. These may be used alone or in combination.

Incidentally, the Canadian standard freeness is based on JIS.
-P-8121 is usually a value indicating the drainage of pulp, but in the present invention, drainage of the slurry composition was determined by the same measurement method.

Hereinafter, the natural organic polymer fiber-containing system which is most suitable as a raw material of the buffer material will be mainly described in more detail, but the present invention is not particularly limited thereto. Examples of natural organic polymer fibers include (1) unbleached or bleached chemical pulp obtained by kraft pulping, sulfite pulping, alkali pulping, etc. of coniferous or hardwood, or GP, TMP (thermomechanical pulp) Mechanical pulp such as, or cotton pulp, linter pulp, water repellency, water resistance described in Japanese Patent Application No. 10-0322920,
Waste paper pulp, liquid ammonia-treated pulp, mercerized pulp, and curled fiber (manufactured by Warehauser, USA, trade name:
HBA-FF, NHB405, NHB416), cellulosic fibers such as hemp fibers described in Japanese Patent Application No. 10-377923, (2) protein fibers such as wool, silk, and collagen fibers, and (3) chitin. Complex sugar chain fibers such as chitosan fiber and alginic acid fiber are exemplified. Among them, cellulosic fibers are particularly preferable because they are excellent in performance and easy to procure. The natural organic polymer fiber is usually blended in the range of 35 to 100% by dry weight with respect to the composition.

When it is desired to increase the interlayer strength of the molded product, the pulp is mechanically treated with a sand grinder or the like and fibrillated to obtain a number average fiber length of 0.01 to 0.80.
mm or fine synthetic fibers such as polyethylene fibers, polypropylene fibers, polyethylene-polypropylene sheath-core fibers, copolymerized polyester-polyethylene terephthalate sheath-core fibers, and biodegradable aliphatic polyester fibers. It is effective to mix them. Among them, a combination of pulp-based fine fibers and thermoplastic synthetic fibers is particularly preferable because a molded article having less deformation and excellent surface smoothness can be obtained. The thermoplastic synthetic resin has a number average fiber length of 2 which can be easily dispersed in a medium.
Short fibers in the range of ２０20 mm are particularly preferred. These pulp-based fine fibers and thermoplastic synthetic fibers are used alone or in combination of two or more, and are usually blended in a range of 2 to 40% by dry weight with respect to the composition.

The strip-shaped waste paper described in Japanese Patent Application No. 2000-105555 is excellent in performance, and is preferable as a material used in combination with the above-mentioned fibers. The composition is usually blended in a range of 5 to 80% by dry weight with respect to the composition.

The slurry composition may further contain an adhesive, a waterproofing agent, a water repellent, a dye, a pigment, a drainage improver, a pH adjuster, a slime control agent, a thickener, and the like, if necessary.
Preservatives, fungicides, antibacterial agents, flame retardants, rodenticides, insecticides, humectants, freshness preservatives, oxygen scavengers, foaming agents, surfactants, electromagnetic shielding materials, antistatic agents, rust inhibitors, fragrances ,Deodorants,
Various microcapsules having foaming properties and aromatic properties can be selected and blended. These may be used in combination of two or more.

The slurry is usually prepared batchwise or continuously using an apparatus having a stirrer. Water is usually used as a medium used for forming the slurry, but other organic solvents such as alcohol, acetone, ethyl acetate, and glycerin, or a mixture of water and an alcohol (methanol or ethanol) can be used. . The concentration of the slurry is usually adjusted so that the dry solid content is in the range of 0.05 to 10% by weight.
Are preferred.

When a concave mold having an open surface on one side is used, the slurry is injected into the mold by using a pump having an open port facing upward by a pump from the open port as in a normal pulp mold. Immerse the slurry in the slurry tank with the opening facing downward, and suck the slurry into the mold from the downward opening by sucking through the small holes.
It is possible to adopt a method in which the mold is sucked while sinking the mold into the slurry tank with the open port facing upward, and the slurry is sucked into the mold through the open port.

The method of removing the medium of the slurry from the small holes includes, for example, a suction dehydration method, a gas pressure dehydration method, a mechanical pressure dehydration method, an electroosmotic dehydration method and the like, and these can be combined. The type of slurry used for injection is usually one type, but the injection of slurry is divided into two or more stages, and by changing the composition of the slurry used at that time, a state in which deposited layers of different compositions are sequentially laminated. Molded articles can also be obtained.

In the present invention, the Canadian Standard Freeness (CS)
F) Since a highly drainable slurry composed of a composition of 550 ml or more is used, the fluidity is poor, and when formed using a concave mold having an open surface, the deposited layer on the open surface is likely to have irregularities. When compressed and dried with a plate-like material having a flat and smooth surface, a molded product having a non-uniform density is obtained. Therefore, as described in Japanese Patent Application No. 10-49985, a wet molded product is used. It is desirable to deposit over the opening surface of the lower mold and to remove unnecessary portions that have accumulated over the opening surface of the molding die before the drying step.

Unnecessary portions can be cut off by using a high-pressure or low-pressure water jet, a water stream using a high blow nozzle (manufactured by Taketsuna Seisakusho), a thread saw, a belt saw (endless belt-shaped blade), a tip saw (disk-shaped blade). Blade) or the like can be used. However, the excision method is not limited to the above.

Drying of the wet molded product after dehydration is performed by supplying hot air from above the deposited layer and passing through the deposited layer. Since the drying speed increases in proportion to the amount of air passing through the deposition layer, hot air is usually supplied while sucking from the bottom of the deposition layer.Hot air is injected under pressure from the top of the deposition layer without suction from the bottom Then, a pressure difference is generated between the upper and lower portions of the deposited layer, and drying is performed by, for example, injecting hot air from the upper portion of the deposited layer while suctioning from the lower portion. As the pressure difference between the upper part and the lower part of the deposition layer is larger, the amount of air passing through the deposition layer increases and the drying speed increases. Usually 100 to 25 as hot air
Air in the range of 0 ° C. is used. Known methods such as infrared drying and microwave drying can be used in combination for drying. For drying halfway, heated steam is also effective. In order to increase the drying speed, it is also effective to provide a hole and / or groove which penetrates or does not penetrate the wet molded product to improve the air flow. Examples of the method of forming holes and grooves include a method of post-processing a molded article in a wet state by using a pressing machine, a cutting machine, a water jet, or the like as described above, a method of attaching a convex-shaped article to a molding die or −
As described in Japanese Patent No. 325871, there may be mentioned a method of giving a shape to a molded product simultaneously with molding by a method such as using a sinking die.

The molded product in the developed shape is usually assembled and fixed in a shape before the development by raising a developed portion after molding. For the fixing, a method such as fitting or bonding can be used. However, when the raised portion is supported and fixed by the outer box, for example, as in a case in which the cushioning material for packaging is housed in a box together with the product and used, a means such as fitting, bonding or the like is not necessarily required. No need to use. For bonding, an adhesive or a pressure-sensitive adhesive can be used. Specifically, starch,
Processed starch, vegetable gum, gelatin, casein, PVC, C
MC, hydroxyethyl cellulose, urea resin adhesive, melamine resin adhesive, phenol resin adhesive,
Epoxy resin adhesive, vinyl acetate resin adhesive, cyanoacrylate adhesive, polyurethane adhesive, α-olefin-maleic anhydride resin adhesive, water-soluble polymer-isocyanate adhesive, reactive acrylic resin Adhesive, vinyl acetate resin emulsion adhesive, vinyl acetate copolymer resin emulsion adhesive, EVA resin emulsion adhesive, acrylic resin emulsion adhesive, reactive hot melt adhesive, EVA hot melt Adhesive, elastomer hot melt adhesive, polyamide hot melt adhesive, chloroprene rubber solvent adhesive, synthetic rubber solvent adhesive, synthetic rubber latex adhesive, acrylic resin emulsion adhesive Agents and the like. These can be used alone or in combination. These are applied to the joint surface by means such as spraying or brushing.

When fixing by fitting, a fitting structure known in the art can be used. For example, a structure as shown in FIG. 26 can be mentioned. The fitting structure, besides using a molding die to make the shape,
It can also be provided by post-processing after molding. In this case, a method using a mold is more preferable in terms of production efficiency. In the case where the fixation is insufficient with the fitting alone, the above-mentioned adhesive and pressure-sensitive adhesive can be used together.

The molded body of the present invention can be subjected to various processes as needed, in a developed state or in a state where it is raised and assembled and fixed. For example, by a method such as spraying, impregnation, coating, an adhesive, a waterproofing agent, a water repellent, a dye, a pigment, a preservative, a fungicide, an antibacterial agent, a flame retardant,
Raticides, insect repellents, freshness preserving agents, oxygen scavengers, electromagnetic shielding materials, antistatic agents, rust inhibitors, fragrances, deodorants, etc. can be included. In addition, synthetic resin film, synthetic paper,
It can be bonded to other materials such as a synthetic resin plate, water-resistant paper, water-repellent paper, metal foil such as aluminum, a metal plate, and a glass plate. Processing such as cutting and printing can also be performed. Hereinafter, the present invention will be described more specifically with reference to examples. However, needless to say, the present invention is not limited to these examples. In Examples and Comparative Examples, “parts” and “%” indicate “parts by weight” and “% by weight” unless otherwise specified.

Example 1 A jute hemp bag was pulverized with a pulverizer (Atoms Model 14-1200, manufactured by Hyakuma Yamamoto Seisakusho Co., Ltd.), and then the fibers were softened with a grinder mill (GM4-25, manufactured by Glow Engineering). To obtain hemp fibers having a number average fiber length of 7 mm. The Canadian Standard Freeness of this fiber was measured to be 752 ml. Further, a 1.5-liter sand grinder filled with 80% glass beads having an average particle size of 2 mmΦ is prepared by using a water slurry of waste corrugated paper pulp having a solid concentration of 1% (Dynomill KDL-PIL manufactured by Shinmaru Enterprises).
OT) was introduced and passed at 350 ml / min to obtain fine fibers having a number average fiber length of 0.30 mm. Next, 85 parts (dry weight) of the above hemp fibers and 5 parts (dry weight) of fine fibers were further combined with a copolyester-polyethylene terephthalate sheath core fiber (TSF. TJ04CN2.
2 × 5) A mixture of 10 parts (dry weight) was mixed with water to adjust the solid content concentration to 1%, and sufficiently stirred to obtain a slurry. The slurry composition was found to have a Canadian standard freeness of 697 ml. Subsequently, the side wall surface of the packaging cushioning material 10 of FIG. 1 in which the height of the side wall surface 12 is 80 mm and the thickness of the bottom surface 11 is 30 mm is developed into a flat structure, and the entire thickness is reduced to 30 mm or less. After preparing a concave mold 13 shown in FIG. 12 having a molding cavity corresponding to the above, a hopper 19 is mounted on the mold 13 as shown in FIG. 13, and the suction chamber 17 is first filled with water. The above slurry was supplied from the guide 20 into the hopper. Subsequently, as shown in FIG. 14, suction dehydration was performed through a suction port 18 provided at a lower portion of the molding die 13, and fibers were deposited so as to swell on the open surface of the molding die. Next, as shown in FIG. 15, the hopper was removed, and then, as shown in FIG. 16, an unnecessary portion deposited so as to rise on the open surface of the mold was cut off with a tip saw 24 to prepare the surface. Next, FIG.
The drying device 25 is closely set on the smooth surface of the wet molded product as shown in FIG.
Then, hot air was sent from the substrate and dried to obtain a molded body 29 in a developed state shown in FIG. Drying was performed using hot air at 210 ° C. and suction was performed under the conditions of −600 mmHg.
It took a minute. Subsequently, the side wall surface 1 of the molded body 29 in the expanded state
9 and fixed using a vinyl acetate adhesive.
A cushioning material for packaging (10 in FIG. 19) was obtained.

Comparative Example 1 FIG. 2 (FIG. 3 is a sectional view) having a molding cavity corresponding to the packaging cushioning material 10 of FIG. 1 having a side wall surface height of 80 mm and a bottom surface thickness of 20 mm is shown. Except that the concave mold 13 was used, molding and drying were performed in exactly the same manner as in Example 1 to obtain a packaging cushioning material 10 shown in FIG. It took 7 minutes and 30 seconds for drying.

[0029]

As described above, the present invention provides a Canadian standard freeness (CS) of a slurry composition in a mold having a molding cavity corresponding to a shape obtained by developing a part of a concavo-convex molded body.
F) supplies 550 ml or more of slurry, and removes water, which is a medium of the slurry, from the pores of the molding die, thereby depositing fine components that do not pass through the pores in the slurry into the molding die and forming the wet state. Forming a product, subsequently drying the formed product, and further raising a developed portion to obtain a shape before development, so that a thick molded product with severe unevenness can be extremely formed. It can be produced efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view of a packaging cushioning material having a concave portion for storing and protecting a product.

FIG. 2 is a perspective view of a concave mold used so far to obtain the packaging cushioning material of FIG. 1;

FIG. 3 is a cross-sectional view of the concave mold of FIG. 2 taken along line AA.

4 is a cross-sectional view showing a state in which a hopper, which is an enclosure for slurry storage, is mounted on the concave mold of FIG. 3, and pulp slurry is supplied from an upper guide.

FIG. 5 is a cross-sectional view showing a state where pulp is deposited in a mold by suction dehydration.

FIG. 6 is a cross-sectional view showing a state where a hopper is removed from the state of FIG. 5;

FIG. 7 is a cross-sectional view showing a state where unnecessary portions accumulated on an open surface of a mold are cut off.

FIG. 8 is a cross-sectional view showing a state where hot air is injected into a wet pulp molded product and dried.

FIG. 9 is a cross-sectional view showing the dry molded product thus obtained.

10 is a plan view showing a flat structure in which four side walls of the packaging cushioning material of FIG. 1 are developed.

11 is a cross-sectional view of the flat structure of FIG. 10 taken along line BB.

FIG. 12 is a sectional view of a concave mold having a molding cavity corresponding to the flat structure of FIG. 10;

13 is a cross-sectional view showing a state in which a hopper, which is an enclosure for slurry storage, is mounted on the concave mold of FIG. 12, and pulp slurry is supplied from an upper guide.

FIG. 14 is a cross-sectional view showing a state where pulp is deposited in a mold by suction dehydration.

FIG. 15 is a cross-sectional view showing a state where the hopper is removed from the state of FIG.

FIG. 16 is a cross-sectional view showing a state where unnecessary portions accumulated on the open surface of the mold are cut away.

FIG. 17 is a cross-sectional view showing a state where hot air is injected into a wet pulp molded product and dried.

FIG. 18 is a cross-sectional view showing the dry molded product thus obtained.

19 is a cross-sectional view of a cushioning material for packaging obtained by raising and fixing a developed portion of the molded product of FIG. 18.

FIG. 20 is a perspective view of a corner pad (for a corner portion).

FIG. 21 is a perspective view of an L-shaped pad (for a corner).

FIG. 22 is a perspective view of a developed product of the corner pad (for a corner portion) of FIG. 20;

FIG. 23 is a perspective view of a development of the L-shaped pad (for corners) of FIG. 21.

FIG. 24 is a perspective view of an L-shaped pad (for corners) provided with a hole in a surface.

FIG. 25 is a perspective view of a development of the L-shaped pad (for corners) of FIG. 24;

FIG. 26 is a perspective view of an L-shaped pad (for corners) developed with a fitting structure.

[Explanation of symbols]

10: cushioning material for packaging, 11: bottom surface, 12: side wall surface, 1
3: concave mold, 14: inner wall, 15: outer wall, 16: small hole, 17: suction chamber, 18: suction port, 19: hopper, 2
0: guide, 21: pulp slurry, 22: pulp sediment, 23: water drop, 24: tip saw, 25: drying device,
26: hot air vent, 27: small hole, 28: lower part of sediment, 2
9: molded product in an expanded state, 30: corner pad, 31:
L-shaped pad, 32: development of corner pad, 33:
Deployment of L-shaped pad, 34: L-shaped pad provided with a hole in the surface, 35: Deployment of L-shaped pad provided with a hole in the surface, 36: L-shaped pad having a fitting structure Deployment.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E033 AA20 BA10 FA10 3E066 AA01 BA01 CA03 CA05 CA08 DA01 MA05 4L055 AA07 AA11 AF33 AF47 BF07 BF08 FA22 GA04

Claims (3)

[Claims] 1. A slurry having a Canadian Standard Freeness (CSF) of 550 ml or more is supplied into a mold having a molding cavity corresponding to a shape obtained by developing a part of a concavo-convex molded body. By removing water, which is the medium of the slurry, from the pores of the mold, the pore-impermeable fine components in the slurry are deposited in the mold to form a wet molded article, and then the molded article is dried. And a method for producing a concavo-convex molded body, further comprising raising a developed portion to obtain a shape before development. 2. The method according to claim 1, wherein the molding die is a concave molding die having a large number of small holes in a wall and one surface of which is open. 3. When forming a molded article in a wet state, depositing is performed so as to exceed the open surface of the mold, and the unnecessary portion accumulated beyond the open surface of the mold is cut off before the drying step.
The method for producing a molded article according to the above.