JP2020180402A - Manufacturing method of fiber molded product, and fiber molded product - Google Patents

Abstract

To provide a fiber molded product with greatly reduced use amount of fibrous materials.SOLUTION: The manufacturing method of a fiber molded product by molding a fibrous material for formation of a fiber molded product includes a mixing step of mixing a fibrous material and an egg shell powder for formation of a molding raw material and a molding process of molding the molding raw material to a desired shape.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing a fiber-molded product, which produces a fiber-molded product by molding the fiber as it is without twisting it into a thread.

The fiber-molded product is a product formed into a desired shape by sticking the disjointed fine fibers as threads without twisting them. There are various kinds of fiber molded products, for example, paper, pulp mold and the like are typical, and they are used in various industrial fields.

Paper is formed into a sheet by sticking plant fibers and other fibers together. Types of paper include thin and light Western paper (sometimes referred to as paper), thick and hard paperboard, Japanese paper, and non-woven fabric. Many foreign papers are flexible, and include newspapers, printing papers, wrapping papers, sanitary papers, hybrid papers, and the like. Most of the paperboards have increased rigidity by multi-layer papermaking, and include corrugated cardboard base paper, paperboard for paper containers, building material base paper, paper tube base paper, wamps, and the like. Many Japanese papers are entwined with plant fibers of 15 mm to 25 mm, which is longer than the fiber length (1 mm to 5 mm) of the plant fibers of Western paper, and are harder than Western paper by that amount.

The non-woven fabric is an intermediate fiber molded product between paper and cloth, and is made into a sheet (cloth) by adhering or entwining fibers of about 5 mm to 100 mm by thermal, mechanical or chemical action. .. Nonwoven fabrics include felt in a broad sense and may be included in the category of paper.

Pulp mold is made by separating used paper such as newspapers, magazines, corrugated cardboard, and milk cartons into plant fibers again, dissolving it in water, making it with a wire net (mold), molding it, and drying it. is there. Pulp molds are often used in containers, cushioning materials, etc. (see, for example, Patent Document 1).

JP 2011-208289

There are four main types of fibers that are used as raw materials for fiber molded products: plant fibers, animal fibers, chemical fibers, and metal fibers. Among them, plant fibers and chemical fibers are selected because of their wide range of applications and applications. Used in large quantities.

However, the use of chemical fibers is being regulated from the viewpoint of environmental destruction in incineration treatment at the time of disposal and landfill treatment. Wood pulp and used paper pulp are used for most of the plant fibers, but in the case of wood pulp, it is necessary to cut down coniferous trees and broad-leaved trees, so environmental destruction becomes a problem. As a result of these, the importance of used paper is increasing, but with the increase in demand, the distribution volume of used paper is insufficient, and the distribution price of used paper (about 20 yen / kg at the time of filing) also rises. It is happening.

The present invention has been made in view of the above problems, and provides a method for producing a fiber molded product capable of reducing the amount of fibers used.

The present invention that achieves the above object is a method for producing a fibrous molded product by molding a fibrous substance to produce a fibrous molded product, which comprises a mixing step of mixing the fibrous substance and eggshell powder to produce a molding raw material. , A method for producing a fiber-molded article, which comprises a molding step of molding the molding raw material into a desired shape.

Further, the present invention that achieves the above object is a fiber molded product containing a fibrous substance and eggshell powder.

According to the present invention, it is possible to obtain an excellent effect that a fiber molded product in which the amount of the fibrous substance used is significantly reduced can be obtained.

The process chart which shows the manufacturing method of the eggshell powder contained in the fiber molded article of this embodiment. The process drawing which shows the manufacturing method of the pulp mold of this embodiment. The front view which shows the molding apparatus used in the manufacturing method of the pulp mold of this embodiment. A photograph of a sample molded product produced by the method for manufacturing a pulp mold of the present embodiment. The process chart which shows the papermaking method of this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, a pulp mold manufacturing method and a paper manufacturing method will be exemplified as a method for manufacturing the fiber molded product, but before that, the eggshell powder manufacturing method used in these manufacturing methods will be described.

<Manufacturing method of eggshell powder>

A method for producing eggshell powder will be described with reference to FIG. The method for producing eggshell powder includes an egg breaking step, a washing step, an eggshell membrane separation step, and a fine pulverization step. In the egg breaking process, chicken eggs are separated into contents (eggs) and eggshells by an egg breaking machine. The contents (egg yolk and egg white, etc.) are used for various foods in food factories and the like. In the washing step, the eggshell is washed with water or the like. After the washing step, the eggshell may be roughly crushed so as to have a particle size of about several millimeters. In the eggshell membrane separation step, the eggshell and the eggshell membrane are separated. There are various methods for separating eggshell and eggshell membranes. For example, the eggshell and eggshell membranes are separated by stirring in a liquid tank, or the eggshell membranes are immersed in a weakly acidic aqueous solution such as hydrochloric acid, sulfuric acid, or acetic acid. A method of peeling, a method of separating the eggshell membrane by utilizing the difference in specific gravity between the eggshell and the eggshell membrane, and the like can be adopted.

In the pulverization process, only the eggshell from which the eggshell membrane has been separated is pulverized using a mill. The particle size to be crushed is, for example, preferably 300 μm or less as a volume average grain shape, more preferably 100 μm or less, and preferably 70 μm or less. On the other hand, in order to reduce the agglutination action after pulverization, the volume average grain shape is preferably 5 μm or more, preferably 10 μm or more, and more preferably 20 μm or more. As a result, the powdery eggshell powder of the present embodiment is obtained. Although the eggshell powder using chicken eggs is illustrated here, the eggshell powder is not limited to chicken eggs, and eggshells of other animals may be used.

Since the eggshell powder is not calcined, calcium carbonate is the main component. On the other hand, the eggshell powder of the present embodiment may be eggshell powder that has undergone a baking step. In the firing step, the eggshell powder (or the eggshell before the fine grinding step) is fired at, for example, 850 ° C. or higher, preferably 900 ° C. or higher to temporarily obtain calcium oxide, and water is added thereto. Make calcium hydroxide powder. When the eggshell powder that has become calcium hydroxide is mixed with the fiber material in the papermaking process described later, the fiber stock solution before the papermaking process becomes a strongly alkaline aqueous solution, and a bactericidal effect can be obtained. It should be noted that it should be avoided as much as possible to use the powder obtained by calcining the eggshell powder into calcium oxide as it is in the wet papermaking process. This is because calcium oxide strongly generates heat when it dissolves in water.

When eggshell powder is calcined and chemically changed to calcium oxide (calcium hydroxide), the particle size becomes smaller and the surface shape becomes smoother, making it difficult to get entangled with fibrous substances. Therefore, in the method for producing a fiber molded product described later, it is preferable to use unbaked eggshell powder.

<Manufacturing method of pulp molded products>

Next, a method for producing a pulp molded product using the eggshell powder will be described with reference to FIG. This manufacturing method includes a disintegration step, a mixing step, a molding (modeling) step, and a drying step.

(Dissolution step) In the disassembly step, the used paper is dissociated into water to obtain a fibrous substance. Specifically, water and used paper are put into a stirring device called a pulper to stir both. As a result, the used paper becomes a fine fibrous substance (waste paper pulp) having an average fiber length of about 1 mm to 5 mm. Depending on the purpose, a step of removing foreign matter, a step of removing ink adhering to used paper, and the like may be performed.

(Mixing process) In the mixing step, the fibrous substance and eggshell powder are mixed to produce a molding raw material. Specifically, eggshell powder is put into the pulper in the disintegration step, and waste paper pulp, eggshell powder, and water are mixed and stirred to produce a molding raw material in which fibrous substances and eggshell powder are dispersed in water. In this molding raw material, the weight content ratio of the eggshell powder to the total weight of the fibrous substance (waste paper pulp) and the eggshell powder is set to 10% or more, preferably 30% or more. More preferably, the weight content ratio of the eggshell powder is 50% or more, and even more preferably 60% or more. The volume average grain shape of the eggshell powder is preferably 300 μm or less, more preferably 100 μm or less, and preferably 70 μm or less. On the other hand, in order to reduce the agglutination effect, it is preferably 5 μm or more, preferably 10 μm or more, and more preferably 20 μm or more. Further, it is preferable to mix the eggshell powder that has not been calcined at a high temperature and whose main component is calcium carbonate. In addition, it is preferable to mix the fixing agent with the molding raw material in or before and after this mixing process. The fixing agent is, for example, a water-soluble inorganic salt, a polymer electrolyte, or the like, and by adding this, it is possible to adsorb the eggshell powder to a fibrous substance or to form flocs of the eggshell powder. It becomes. As a result, this fixing agent makes it possible to ionically bond the fibrous substance and the eggshell powder, and it is possible to increase the content of the eggshell powder after molding.

(Molding step) In the molding step, the molding raw material is molded into a desired shape. The molding process is a molding process here, and is molded into a three-dimensional shape by adhering a molding raw material to the net-like cavity 10 having a three-dimensional shape (three-dimensional shape) as shown in FIG. .. In this embodiment, a case where an egg case 100 for storing and transporting eggs is manufactured as a fiber molded product is illustrated. Therefore, the reticulated cavity 10 has the same shape as the egg case, and a plurality of recesses 10A for accommodating the egg are formed. The molding raw material dispersed in water is stored in the raw material liquid tank 40 in the state of the slurry 50. The reticulated cavity 10 is put into the molding raw material, and a negative pressure is applied to the support portion 20 on the back surface side of the reticulated cavity to suck the molding raw material (slurry 50) through the reticulated cavity. As a result, the fibrous substance and eggshell powder are adsorbed on the surface of the reticulated cavity and formed into a three-dimensional shape. After pulling up from the raw material liquid tank 40 by rotating the reticulated cavity, the molded body 70 is taken out from the reticulated cavity by the suction arm 60 and transferred to the next step.

The wire mesh used in the mesh cavity 10 preferably has a mesh opening (opening size) of 1000 μm or less. It is more preferably 600 μm or less, and further preferably 500 μm or less. Further, the opening (opening size) is preferably 200 μm or less, more preferably 150 μm or less. The number of meshes is preferably 18 or more, more preferably 30 or more, and further preferably 40 or more. Further, the number of meshes is 80 or more, preferably 100 or more. When the opening is 1000 μm or more, the eggshell powder easily passes through the wire mesh during molding, and the amount of eggshell powder remaining in the molded product tends to decrease. When the volume average grain shape of the eggshell powder is set within the range of 20 μm to 100 μm, preferably within the range of 20 μm to 70 μm, clogging is suppressed while being fixed together with the fibers on the surface of the reticulated cavity, and the moisture content is appropriate. Can be made transparent. As a result, it becomes possible to sufficiently leave the eggshell powder in the molded product. If the mesh opening (opening size) of the wire mesh is less than 10 μm, clogging is likely to occur and mass production efficiency is likely to decrease.

Further, when the main purpose is to increase the amount of eggshell powder contained in the molded product, it is also preferable to make the mesh size of the wire mesh smaller than the volume average grain shape of the eggshell powder. For example, when the volume average grain shape is 300 μm or more, the mesh size of the wire mesh is less than 300 μm, and when the volume average grain shape is 100 μm or more, the mesh size of the wire mesh is less than 100 μm and the volume average grain shape is 50 μm. In the above case, the mesh size of the wire mesh may be less than 50 μm.

(Drying step) In the drying step, the molded product is carried into a drying device by a conveyor or the like to dry the molded product. As a result, an egg case that becomes a pulp mold (fiber molded product) is completed.

As described above, according to the method for producing a pulp mold of the present embodiment, it is possible to contain, for example, 50% by weight or more of eggshell powder with respect to the total weight of the egg case to be a fiber molded product. Further, according to the modeling process of the present embodiment, the fibrous substance (waste paper pulp) and the eggshell powder can be laminated in a complicated manner, so that sufficient strength can be secured while increasing the content of the eggshell powder. The eggshell powder is held inside the fibrous molded product by being contained in the gaps between the fibrous substances that are entangled or laminated with each other in the molding process.

The laminated thickness of the fiber molded product is, for example, 0.3 mm or more, preferably 0.5 mm, more preferably 1.0 mm or more, and further preferably 2.0 mm or more in the dried state. Further, by setting the volume average grain shape of the eggshell powder to 20 μm or more, it is appropriately sandwiched between the fibrous substances and is less likely to fall. Further, by setting the volume average grain shape of the eggshell powder to 100 μm or less, the surface of the fiber-molded product can be made comparatively smooth. As a result, eggshells that can be industrial waste can be recycled, and at the same time, the amount of used paper pulp used can be reduced. Furthermore, since eggshell powder is a naturally occurring biological substance, it is less likely to cause allergies or side effects on the human body.

In particular, if the egg case contains egg shell powder to be transported as in the present embodiment, it is clear to the user regarding the importance of recycling natural resources and the realization of a recycling-oriented society. It is possible to convey a powerful message.

FIG. 4 shows a photograph of a plate-shaped sample containing 50% by weight of eggshell powder formed by the method for producing a pulp mold of the present embodiment. A molded product not inferior to the conventional pulp mold containing no eggshell powder was obtained.

In the present pulp mold manufacturing method, a case where eggshell powder is directly charged into the pulper in the disintegration step and mixed is illustrated, but the present invention is not limited to this. For example, it is also preferable to dehydrate and dry the used paper pulp stock solution obtained by the disintegration step and temporarily store the used paper pulp. In this case, the stored waste paper pulp and eggshell powder are dissolved in water to be used as a molding raw material. Further, in the molding step, the case where the net-like cavity is immersed in the molding raw material has been illustrated, but the present invention is not limited to this. For example, the fibrous substance and eggshell powder can be fixed on the surface of the reticulated cavity by pouring a molding raw material (slurry) into the reticulated cavity.

Further, in the method for producing the pulp mold, wet molding using a molding raw material containing water has been exemplified, but the present invention is not limited to this. For example, a dry molding method may be adopted in which a dry fibrous substance and eggshell powder are mixed, transported by air, and sprayed into a net-like cavity to fix the powder. However, in the case of dry molding, eggshell powder is likely to scatter, so wet molding is preferably adopted.

<Papermaking method>

A papermaking method using the eggshell powder will be described with reference to FIG. Here, a case of manufacturing foreign paper will be illustrated. The papermaking method of the present embodiment includes a pulping step, a beating step, a molding (papermaking) step, a dehydration step, and a drying step.

(Pulping step) In the pulping step, lignin is separated by boiling wood pulp in a cooking pot to produce fine fibrous substance (wood pulp). The wood pulp produced in the cooking kettle may be made into white wood pulp through a washing step, a foreign matter removing step, a bleaching step, and the like. The fiber length of wood pulp differs between hardwood and softwood, but is, for example, about 0.5 mm to 4.0 mm.

(Beating process) Wood pulp dissolved in water is fluffed using a beating device to make the fibers easily entangled with each other. The beating device is performed by passing a fibrous substance (wood pulp) through a gap between a pair of discs that rotate relative to each other.

(Mixing process) In the mixing step, eggshell powder is mixed with the beaten fibrous substance to produce a molding raw material. Specifically, the fibrous substance (slurry) that has undergone the beating step is stored in a stirrer, and eggshell powder is further added and mixed and stirred to generate a molding raw material containing water, fibrous substance, and eggshell powder. .. In this molding raw material, the weight content ratio of the eggshell powder to the total weight of the fibrous substance (wood pulp) and the eggshell powder is set to 10% or more, preferably 30% or more. More preferably, the weight content ratio of the eggshell powder is 50% or more, and even more preferably 60% or more. The volume average grain shape of the eggshell powder is preferably 300 μm or less, more preferably 100 μm or less, and preferably 70 μm or less. On the other hand, in order to reduce the agglutinating action of eggshell powder, it is preferably 5 μm or more, preferably 10 μm or more, and more preferably 20 μm or more. Further, it is preferable to mix the eggshell powder that has not been calcined at a high temperature and whose main component is calcium carbonate. In addition, it is preferable to mix the fixing agent with the molding raw material in or before and after this mixing process. The fixing agent is, for example, a water-soluble inorganic salt, a polymer electrolyte, or the like, and by adding this, it is possible to adsorb the eggshell powder to a fibrous substance or to form flocs of the eggshell powder. It becomes. As a result, this fixing agent makes it possible to ionically bond the fibrous substance and the eggshell powder, and it is possible to increase the content of the eggshell powder after molding.

(Molding step) In the molding step, the molding raw material is molded into a desired shape. The molding process of the present embodiment is a so-called papermaking process, in which a molding raw material is adhered to a planar net body to form a sheet. The papermaking apparatus is roughly classified into a long net paper making type and a circular net paper making type. The long net papermaking method is a method in which a fibrous substance / eggshell powder is adsorbed on the surface of a net body by discharging a molding raw material onto the surface of a net body that rotates in an annular shape like a belt conveyor. In the circular net papermaking type, a part of the drum-shaped (cylindrical) net body is immersed in the storage tank of the molding raw material (slurry) while the net body is rotated, so that the fibrous substance / eggshell is placed on the surface of the net body. The powder is pumped up and molded into a sheet. It is also possible to stack the sheets molded into a multi-layer sheet shape.

The wire mesh of the net body used in this papermaking process preferably has a mesh opening (opening size) of 1000 μm or less. It is more preferably 600 μm or less, and further preferably 500 μm or less. Further, the opening (opening size) is preferably 200 μm or less, more preferably 150 μm or less. The number of meshes is preferably 18 or more, more preferably 30 or more, and further preferably 40 or more. Further, the number of meshes is 80 or more, preferably 100 or more. When the opening is 1000 μm or more, the eggshell powder easily passes through, and the amount of eggshell powder contained in the paper tends to decrease. At this time, if the volume average grain shape of the eggshell powder is set within the range of 20 μm to 100 μm, preferably within the range of 20 μm to 70 μm, it becomes possible to appropriately permeate water while suppressing clogging of the net body. , It becomes possible to sufficiently leave eggshell powder on paper. If the mesh opening (opening size) of the wire mesh is less than 10 μm, clogging is likely to occur and mass production efficiency is likely to decrease.

From the viewpoint of increasing the amount of eggshell powder contained in the paper, it is also preferable to make the mesh size of the wire mesh smaller than the volume average grain shape of the eggshell powder. For example, when the volume average grain shape is 300 μm or more, the mesh size of the wire mesh is less than 300 μm, and when the volume average grain shape is 100 μm or more, the mesh size of the wire mesh is less than 100 μm and the volume average grain shape is 50 μm. In the above case, the mesh size of the wire mesh may be less than 50 μm.

(Dehydration Step) In the press step, the sheet-shaped molded body that has undergone the papermaking process is transferred to a felt-shaped conveyor, transported and dehydrated, and further sandwiched between a pair of press rollers to remove excess water.

(Drying step) In the drying step, the sheet-shaped molded product is carried into a drying device and dried. In the drying apparatus, the molded product is brought into contact with the heating roller to evaporate the water content. As a result, a paper containing eggshell powder is completed.

As described above, according to the papermaking method of the present embodiment, it is possible to contain, for example, 50% by weight or more of eggshell powder with respect to the total weight of the paper to be a fiber molded product. As a result, eggshells, which are easily treated as industrial waste, can be effectively used, and at the same time, the amount of wood pulp used can be reduced. Furthermore, since eggshell powder is a naturally occurring biological substance, it is less likely to cause allergies or side effects on the human body. The thickness of the paper is, for example, 0.3 mm or more, preferably 0.5 mm or more, and the holding power of the eggshell powder can be enhanced.

In the present papermaking method, the case where eggshell powder is mixed with the fibrous substance after the beating step is illustrated, but the present invention is not limited to this. For example, it is also preferable to mix eggshell powder with the fibrous substance obtained in the pulping step and then perform the beating step. In this way, it becomes possible to entangle the eggshell powder with the fibrous substance while fluffing it, and it is possible to increase the fixing rate of the eggshell powder on the paper.

Further, in the present papermaking method, wet molding using a molding raw material (slurry) containing water has been exemplified, but the present invention is not limited to this. For example, a dry molding method may be adopted in which a dried fibrous substance and eggshell powder are mixed, transported by air, and sprayed onto a sheet-shaped (including tubular) net body to fix them. However, in the case of dry molding, eggshell powder is likely to scatter, so wet molding is preferably adopted.

In this papermaking method, a pulping step of producing wood pulp from wood chips has been illustrated, but instead of this pulping step, a disintegration step of producing used paper pulp may be adopted. In the disintegration step, the waste paper is dissociated into water to obtain a fibrous substance (waste paper pulp). Specifically, water and used paper are put into a stirring device called a pulper to stir both. As a result, the used paper becomes a fine fibrous substance (waste paper pulp). When papermaking is carried out using used paper pulp, for example, it is preferable to manufacture corrugated board base paper.

In the above papermaking method, a case where used paper or wood pulp is used as the fibrous substance has been exemplified, but the present invention is not limited to this, and synthetic fibers and metal fibers can also be used.

Further, the non-woven fabric can be produced by applying the present papermaking process. In the case of a method for producing a non-woven fabric, a fiber bonding step is further applied to a fiber-molded product molded into a sheet by a wet method or a dry method. Types of fiber bonding steps include, for example, a dipping method, a spray method, a thermal bond method, a needle punching method, a water flow entanglement method, and the like. In the dipping method, the fiber molded product is dipped in a binder and dried to bond the fibers to each other. In the spray method, a binder is sprayed on the fiber molded product and dried to bond the fibers to each other. In the thermal bond method, heat-soluble fibers are mixed in advance with a fibrous substance, and the fiber-molded product is sandwiched between heating calenders (heating rollers) to partially dissolve the heat-soluble fibers and bond the fibers to each other. .. In the needle punch method, the fibers are mechanically entwined with each other by piercing the fiber molded product with a needle. In the water flow entanglement method, fibers are mechanically entangled with each other by injecting a water flow from a nozzle onto a fiber molded product.

From the viewpoint of increasing the fixation rate of eggshell powder, a chemical bond method such as a dipping method or a spray method is preferable. The thermal bond method is also preferable in that the eggshell powder is fixed to the heat-melted fibers. The water flow confounding method is not preferable as compared with other methods because the eggshell powder is easily separated when the water flow is sprayed.

Further, in the above papermaking method, it is also preferable to apply a coating agent or the like to the paper surface, and it is possible to suppress the detachment of eggshell powder. Similarly, it is also preferable to include a fixing agent / adhesive in the slurry as a molding raw material.

As described above, according to the method for producing a fiber-molded product of the present embodiment, the fibrous substance and the eggshell powder are mixed and then molded into a desired shape having a sheet shape or a three-dimensional shape. Therefore, the eggshell powder is recycled. At the same time, it becomes possible to reduce the consumption of fibrous substances. Further, in the fiber molded product, the weight content ratio of the eggshell powder can be 30% or more of the total weight, and the recycling of the eggshell powder can be promoted. In particular, it is said that 160,000 tons of chicken egg shells are treated as industrial waste annually in Japan, and by recycling this, the environmental load can be reduced.

Further, when unbaked calcium carbonate is used as the eggshell powder, the entanglement with the fibrous substance becomes strong, and the content in the fibrous molded product can be increased. Further, when calcium hydroxide after firing and hydration is used as the eggshell powder, it is possible to add a bactericidal effect and a deodorizing effect to the fiber molded product. Therefore, it is also preferable to contain both unbaked eggshell powder and baked eggshell powder. The eggshell powder (calcium oxide or calcium hydroxide) after firing is retreated and returned to calcium carbonate, which is also included in the category of eggshell powder of the present invention.

Further, since the volume average grain shape of the eggshell powder contained in the fiber-molded product of the present embodiment can be 300 μm or less, the surface of the fiber-molded product can be smoothed. On the other hand, since the volume average grain shape of the eggshell powder can be 20 μm or more, it is easy to get entangled with the fibrous substance, and the dispersion of the eggshell powder from the surface of the fibrous molded product can be reduced. In particular, in the present embodiment, since the wall thickness can be set to 0.3 mm or more, the fibrous substance and the eggshell powder become intricately entangled inside, and the holding power of the eggshell powder can be enhanced. In order to further increase the holding power of the eggshell powder, it is preferable to press the molded product before drying to apply pressure.

10 Reticulated cavity 20 Support part 40 Raw material liquid tank 50 Slurry (molding raw material)
60 Suction arm 70 Mold 100 Egg case

Claims (17)

A method for producing a fibrous molded product by molding a fibrous substance to produce a fibrous molded product.
A mixing step of mixing a fibrous substance and eggshell powder to produce a molding raw material,
A molding step of molding the molding raw material into a desired shape, and
It is characterized by having
Manufacturing method of fiber molded products. The molding raw material is characterized in that the weight content ratio of the eggshell powder to the total weight of the fibrous substance and the eggshell powder is 10% or more.
The method for producing a fiber molded product according to claim 1. The fibrous substance is characterized by containing at least one of a plant fiber, a synthetic fiber, and a metal fiber.
The method for producing a fiber molded product according to claim 1 or 2. The eggshell powder is a crushed egg shell of a chicken egg.
The method for producing a fiber molded product according to any one of claims 1 to 3. The eggshell powder is characterized by having a volume average grain shape of 300 μm or less.
The method for producing a fiber molded product according to any one of claims 1 to 4. The eggshell powder is characterized by having a volume average grain shape of 20 μm or more.
The method for producing a fiber molded product according to any one of claims 1 to 5. The eggshell powder is characterized by containing a powder that has not been calcined at 900 ° C. or higher.
The method for producing a fiber molded product according to any one of claims 1 to 6. It is characterized by having a dissociation step of dissociating used paper to obtain the fibrous substance.
The method for producing a fiber molded product according to any one of claims 1 to 7. The molding step is characterized by including a papermaking step of molding into a sheet by adhering the molding raw material to a planar net body.
The method for producing a fiber molded product according to any one of claims 1 to 8. The fiber molded product is a corrugated cardboard base paper.
The method for producing a fiber molded product according to claim 9. The molding step is characterized by including a molding step of molding into a three-dimensional shape by adhering the molding raw material to a net-like cavity having a three-dimensional shape.
The method for producing a fiber molded product according to any one of claims 1 to 8. The fiber molded product has a wall thickness of 0.3 mm or more.
The method for producing a fiber molded product according to any one of claims 1 to 11. As the fiber molded product, a tray for eggs is molded.
The method for producing a fiber molded product according to claim 11. The mesh size of the net body or the net-like cavity is 1000 μm or less.
The method for producing a fiber molded product according to claim 9 or 11. A fiber-molded product, which is produced by the method for producing a fiber-molded product according to any one of claims 1 to 14. A fibrous molded product characterized by containing a fibrous substance and eggshell powder. The fiber-molded product according to claim 16, wherein the eggshell powder is contained in an amount of 10% by weight or more.

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