JP2003251726A - Three-dimensional moldings and fabricating method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a porous activated material powder has a strong possibility of separation, in particular the presently proposed powder of a fragment or the like represented by the colored material of an activated carbon fragments or the like is worth appearance failure and it is strongly impossible to be accepted by a consumer, in conventional three-dimensional moldings containing the porous activated material powder. <P>SOLUTION: Three-dimensional moldings and a fabricating method therefor characterized in that the vegetable fiber of a pulp fiber or the like comprises a main raw material, a plurality of fiber layers fusing the vegetable fiber of a heat sealable thermoplastic resin or the like and the heat sealable thermoplastic resin are fused to form a fused surface, and at least one fused surface contains the porous activated material powder are provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fiber layer obtained mainly by using plant fibers typified by pulp and containing a material containing a thermoplastic resin such as a thermoplastic resin fiber having a binder function by means of heat treatment or the like. The present invention relates to a three-dimensional molded product such as a paper container that can be three-dimensionally molded and processed and is expected to be used in various applications, and a method for manufacturing the same. In order to add an additional function, a crushed product of a porous active substance represented by activated carbon, TECHNICAL FIELD The present invention relates to a three-dimensional molded article such as a paper container in which a powder containing the above is sandwiched between pulp mats and is carried out in the next step by means such as three-dimensional molding, and a method for producing the same.

[0002]

2. Description of the Related Art As a container selected from a three-dimensional molded article made of vegetable fibers, vegetable fibers typified by pulp are dispersed in water and a slurry is made up with a net having a three-dimensional shape and then dried. A wet molding method, which is a so-called pulp molding method, for forming a molded product is generally used.

[0003]

In the above-mentioned wet manufacturing method, the only method of mixing the powder of the porous active substance is to mix it in the slurry and make it together with the pulp. In addition, it is highly possible that porous active substance powder is deposited on the surface of the molded product thus obtained, and in particular, powder such as pulverized products represented by colored materials such as the activated carbon pulverized product proposed this time has an appearance. It is likely to be bad and not acceptable to consumers.

[0004]

In order to solve the above problems, the present invention provides, in the invention of claim 1, plant fiber as a main raw material, which is a thermoplastic resin which can be heat-sealed with the plant fiber. A three-dimensional molded article characterized in that a plurality of fibrous layers fused with each other are fused to form a fused surface and at least one of the fused surfaces has a porous active substance powder. To do.

In the invention of claim 2, the three-dimensional molded article according to claim 1 is characterized in that the plant fiber is a pulp fiber.

In the invention of claim 3, the thermoplastic resin which can be heat-sealed is a resin fiber.
Alternatively, the three-dimensional molded article described in 2 is provided.

[0007] In the invention of claim 4, vegetable fiber,
Thermoplastic resin capable of heat fusion with the plant fiber A step of forming a fiber layer by heat treatment of the plant fiber, and performing hot press molding after sandwiching a porous active substance powder between at least one fiber layer The method for producing a three-dimensional molded article according to any one of claims 1 to 3 is provided.

For example, first, Japanese Unexamined Patent Publication No. 2001-2326261.
Dry method as described in the publication, namely, mixing resin fibers for the purpose of imparting a binder function to plant fibers such as pulp defibrated into cotton, and then applying heat so that they are not broken by some tension at first. As shown in the production method in which a fiber layer such as a pulp mat is finally formed and a three-dimensional shape is finally given by hot pressing, a plant fiber is used as a main raw material, and a thermoplastic resin that can be heat-sealed with the plant fiber is used. A fused fiber layer is provided.

Of course, even if the fiber layer is provided by a method other than this manufacturing method, another manufacturing method or configuration may be used as long as it can be fused on the surface.

A plurality of fiber layers are provided in which a vegetable fiber is a main raw material and a thermoplastic resin which can be heat-sealed with the vegetable fiber is fused.

Two or more of the plurality of fiber layers are prepared, and the porous active substance powder, which is a functional substance, is disposed between at least any one of the fiber layers to form a layer. It is possible to dispose the porous active substance powder, which is a functional material, only in the central portion of the, and it is possible to impart the function without impairing the appearance.

The fiber layer, which is a pulp mat, has a surface that is not as smooth as ordinary paper due to its manufacturing method, and has considerable irregularities, but it is convenient to sprinkle the pulverized material as in this case.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

A plurality of fiber layers containing a vegetable fiber as a main raw material and a thermoplastic resin which can be heat-sealed with the vegetable fiber are fused to form a fused surface, and at least one of the fiber layers is formed. Due to the constitution of the three-dimensional molded product characterized by having the porous active substance powder on the fused surface, a three-dimensional molded product having the functional material only in the intermediate layer without the functional material appearing in the surface layer can be obtained. . Further, the functional material sandwiched between the fiber layers such as pulp mat is also taken into the resin fibers that are re-melted by the heat during the three-dimensional molding and cannot be deposited outside.

Examples of the porous active substance include activated carbon, activated clay, acidic clay, natural zeolite, synthetic zeolite (hydrophilic and hydrophobic), bentonite, sepiolite, silica, a mixture of MgO and SiO ₂ , and the like. It is also effective to mix an iron-manganese-based catalyst substance or the like with the above-mentioned porous active substance or to use it alone.

However, since some substances cannot be used in food containers, it is important to consider hygiene. However, in cases other than food applications such as food containers, it does not matter what kind it is, and it is also possible to use it for food applications such as food containers by making it surface-separable.

The shape of the porous active substance is preferably in the range of 0.5 to 2.5 mm in particle size so as not to hinder fusion bonding and to prevent precipitation on the surface.

The method for applying the porous active substance can be appropriately selected depending on the shape and properties of the fiber layer, and spraying is usually sufficient, but means such as coating with an adhesive may be used. There is no such thing.

As the plant fiber, it is possible to use hardwood, conifer, herbaceous fiber and the like. The form of utilization thereof is pulp fiber, fiber derived from waste paper, and paper. is there. Furthermore, all need not be vegetable fibers, and may be fibers that also include materials such as synthetic fibers as necessary, or may include additives such as polyvinyl alcohol (hereinafter referred to as PVA). It is a thing.

Further, as the thermoplastic resin, it is necessary that the surface has at least a heat-fusible property, and for example, the resin fiber which is not a thermoplastic resin and which is composed of plant fibers or chemical fibers, etc. Alternatively, it may contain an additive such as a surfactant.

As a use, it has a three-dimensional shape,
If the effect of the porous active substance is required,
In addition to the container, it can be considered to be used as a household article.

Furthermore, it is possible to add other functional layers and surface treatments. For example, it is also possible to add an isolation layer for the above-mentioned food use, a surface treatment by a treatment such as PVA coating, a water resistant layer for imparting water resistance, and an oil resistant layer for imparting oil resistance.

Furthermore, it is not necessary for the plurality of fiber layers to have the same composition. For example, the first layer has high strength maintenance performance,
In some cases, it may be preferable that the second layer has a high water resistance, so that the functions are shared. On the other hand, the same material may be easily produced. Therefore, it can be appropriately selected as necessary.

Although the fusing is practically based on heat, it may be fusing by infrared rays, electron beams, high-frequency fusing, or the like. Especially in the case of using heat, it is possible to improve the fusion performance by simultaneous pressing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in more detail with reference to the drawings, but the present invention is not limited thereto.

As the deodorizer 3, Bincho charcoal, which is a kind of activated carbon, was crushed to 0.5 to 1.0 mm.

The pulp mat is obtained by defibrating softwood (hereinafter referred to as NBKP) pulp into fluff pulp, which is a resin fiber having a core / sheath structure (core / sheath = polypropylene (hereinafter referred to as PP) / polyethylene (hereinafter referred to as PE). (Referred to as))) (9: 1 or 8: 2 is desirable), and further, the mixture is formed into a sheet by the air-laid method, and finally placed in an oven having a melting point of PE or higher and a melting point of PP or lower (approximately 120 to 150 ° C.). Created by exposing.

When stacking a plurality of completed pulp mats, an appropriate amount of deodorant 13 is sprinkled on the mat 12 to sandwich the deodorant 13 between the mats 11 and 12 as shown in FIG. The three-dimensional pulp container shown in FIG. 1 was obtained by hot press molding the laminate with the male mold 14 and the female mold 15 shown in FIG. (The temperature of hot press molding is preferably 160 ° C. or higher of the melting point of PP in order to melt PP, which is the core of the resin fiber.) However, if it is left as it is, there is no water resistance, so the inner surface is waterproof. As shown in FIG.
It was set up like.

[0029]

According to the above method, the container having a porous active substance represented by activated carbon in the intermediate layer exhibits the following effects.

The deodorizing effect, that is, the porous active substance such as activated carbon can adsorb the odor of the food contained in the container due to the large surface area due to the porosity. In particular,
Best as a takeout container for foods with strong odors such as dumplings, dumplings and meat buns.

As a result, the freshness-retaining effect, that is, the fruits and vegetables produce ethylene gas by themselves, whereby aging, aging, and rot proceed. Since activated carbon has the ability to adsorb this ethylene gas, it is possible to maintain freshness at a very high level.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment according to the present invention.

FIG. 2 is a cross-sectional view showing a state before hot pressing of the embodiment of FIG. 1 according to the present invention.

FIG. 3 is a cross-sectional view showing a hot-pressed state of the embodiment of FIG. 1 according to the present invention.

FIG. 4 is a cross-sectional view in which a water resistant layer is added to the embodiment of FIG. 1 according to the present invention.

[Explanation of symbols]

11 ... Matt 12 ... Matt 13 ... Deodorant 14 ... Male 15 ... Female 16 ... Water resistant layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E033 AA08 BA10 BA13 BB07 DA08                       DD01 FA04                 4F100 AA37B AD11B AJ02A AJ02C                       AK01A AK01C AS00A AS00C                       BA03 BA06 BA10A BA10C                       BA11 DE01B DG01A DG01C                       DJ00B EJ172 EJ422 GB15                       GB23 JB16A JB16C JL00

Claims (4)

[Claims] 1. A plurality of fiber layers containing a plant fiber as a main raw material and a thermoplastic resin capable of being heat-sealed with the plant fiber are fused to form a fused surface, and at least 1 A three-dimensional molded article having a porous active substance powder on one of the fused surfaces. 2. The three-dimensional molded article according to claim 1, wherein the plant fiber is pulp fiber. 3. The three-dimensional molded article according to claim 1, wherein the heat-fusible thermoplastic resin is a resin fiber. 4. A process for forming a fiber layer by heat-treating a plant fiber and a thermoplastic resin plant fiber that can be heat-sealed with the plant fiber; and after sandwiching a porous active substance powder between at least one fiber layer. The method for producing a three-dimensional molded article according to claim 1, wherein the three-dimensional molded article is produced by hot press molding.