WO2001068983A1

WO2001068983A1 - Pulp molding

Info

Publication number: WO2001068983A1
Application number: PCT/JP2001/002005
Authority: WO
Inventors: Yoshiaki Kumamoto; Hidehiko Nakayama; Masataka Ishikawa; Shingo Odajima; Tokihito Sono
Original assignee: Kao Corporation
Priority date: 2000-03-15
Filing date: 2001-03-14
Publication date: 2001-09-20

Abstract

A pulp molding having one or more colors imparted thereto by having pattern forming components added thereto in the paper-making process, dehydration process or drying process, wherein the colored pattern forming components are nonuniformly dispersed to provide the surface with a shade of color based on the pattern forming components.

Description

Ming Pulp molded body Technical field

TECHNICAL FIELD The present invention relates to a pulp molded article whose surface is decorated

As a method of applying a warp decoration to the surface of the pulp molded article, there is a method of attaching a printed matter to the surface of the molded article or molding (a method of performing direct tambo printing on a book surface. However, these methods have disadvantages that the steps are complicated and time-consuming, and, depending on the type of pattern to be applied, there is no sense of unity with the molded body, and the appearance may be inferior in texture. Separately, the surface of the molded body is colored with a single color, but since it is a single color, no pattern is formed ₌ Also, Japanese Patent Publication No. 35 — 70091 In Japanese Patent Application Publication No. 2000-214, there is described a method of manufacturing a decorative board by laminating Japanese paper with a watermark pattern on a water-squeezed fiber mat and hot-press molding. And the appearance of the product may be degraded. International Publication WO94 / 295626 describes a method for producing a molded pulp from a pulp containing a component having a contrasting color that causes a molded article to have a speckled appearance. There is no operation for expressing the gradation effect in the molded body, and only the components having the contrasting colors are mixed, and therefore, the hue gradation, lightness gradation, and saturation gradation are formed in the molded body. No shading pattern is generated by the application ₌ disclosure of the invention Accordingly, an object of the present invention is to provide a molded pulp molded article having various patterns and excellent appearance and aesthetics. In the present invention, the pattern-forming component is added in the papermaking, dehydration or drying step to be colored into one or more colors, and the colored pattern-forming component is dispersed non-uniformly to the pattern-forming component. The above object can be achieved by providing a pulp molded article having a light and shade pattern based on the surface thereof. Also, the present invention provides a preferable method for producing the pulp molded article. The pulp slurry obtained by dispersing the pigment aggregate and / or the fiber aggregate colored by the pigment together with the pulp fiber in water is supplied to a papermaking mold, and the papermaking surface of the papermaking mold is supplied to the papermaking mold. It is intended to provide a method for producing a pulp molded body, in which pulp fibers are deposited on the pulp to form a molded body. Further, the present invention provides, as a preferred method of manufacturing the pulp molding, a method in which a pulp slurry is supplied to a papermaking mold to deposit pulp fibers on a papermaking surface of the papermaking mold, and A method for manufacturing a pulp molded article that supplies a pigment or dye continuously or intermittently to the papermaking mold while depositing the pulp fiber after a predetermined time has elapsed from the start of supply. Further, the present invention provides, as another preferred method for producing the pulp molding, a method for producing the pulp molding according to claim 1, wherein the first pulp slurry comprises: Pulp molding (a method for producing a book) in which a second pulp slurry having a different color from the first pulp slurry is simultaneously or sequentially supplied to a papermaking mold by slurry supply means different from each other. To It is something to offer. Further, the present invention provides, as another preferred method for producing the pulp molded article, a first pulp slurry containing a pigment aggregate and a fiber aggregate colored by Z or a pigment. The pulp slurry obtained by heterogeneously mixing and dispersing a second pulp slurry having a different color from the first pulp slurry is supplied to a papermaking mold, and a molded body is formed on the papermaking surface of the papermaking mold. Another object of the present invention is to provide a method for producing a pulp molded article which is to be molded. The first pulp slurry containing the colored fiber aggregates and the second pulp slurry having a different color from the first pulp slurry are supplied almost simultaneously to a papermaking mold to form the papermaking mold. Pulp molding for molding compacts on paper There is provided a process for producing a molded article. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described based on preferred embodiments. The molded pulp product of the present invention has a three-dimensional shape and is formed by adding a pattern forming component in a papermaking, dehydration or drying step. The pulp molded article of the present invention is colored into one or more colors by adding the pattern-forming component, and the colored pattern-forming component is unevenly dispersed to form the pattern. A shading pattern of color based on S is irregularly or regularly formed on the surface thereof: a shading pattern in the present invention is formed for the purpose of decorating the surface of a molded article, and Blur of one or more colors appearing on the surface. Blurring is the power of the border between colors; it is the way colors move naturally without clarity. Color includes both achromatic and chromatic colors, and also includes transparency _c There are three types of light and shade patterns formed on the surface of the molded article of the present invention: hue gradation, lightness gradation, and saturation gradation. In the present invention, any one of these three types or a combination of any two or more is used. How these three types are combined to form a light and shade pattern is determined by the type of the pattern forming component and the method of manufacturing a molded article. = Various substances are used as the pattern forming component. It can be: In particular, since the light and shade pattern stands out and the appearance of the molded article becomes more aesthetically pleasing, the pattern forming component is dye-agglomerated, and is colored by one and / or a dye. It is preferable to use fiber aggregates, pigments, dyes, resin fibers or resin particles. The pattern forming component may be present only on the surface and in the vicinity of the surface in the thickness direction of the molded body, and for example, may exhibit a mallow tone pattern. Alternatively, the pattern-forming component exists not only on the surface of the molded body and in the vicinity thereof, but also in a lump in the thickness direction, and the pattern-forming component present inside when viewed from the outside can be visually recognized. Even if a light and shade pattern is expressed, particularly, the pattern forming component also exists inside the thickness direction, and the pattern forming component present inside when viewed from the outside is visually recognized. It is preferable that a light and shade pattern is developed because a textured pattern is obtained. In this case, the pattern forming component may exist continuously in the thickness direction of the molded body, or may exist in a discontinuous drawing.よい May be present in the book, or may be unevenly distributed in a part thereof: Molding ίThe pattern-forming component in the direction of rising of the liquid level of the pulp slurry supplied during papermaking of the book In such a state, when the model forming component is present, the forming sample may be formed in such a manner as to gradually decrease in the liquid ascending direction. Color A gradation pattern that gradually becomes thinner appears. As described above, the color of the light and shade pattern includes transparency, but in order to form a transparent light and shade pattern, it is preferable to use, for example, a resin fiber or a resin powder described later as the pattern forming component. In particular, resin fibers may be used: in detail, the resin fibers are added in any step of forming a book, typically in a papermaking process, and the formed body is brought to a predetermined temperature in a drying step. Heating causes the resin fibers to melt and become transparent _{= the} light and shade pattern composed of the transparent resin fibers is roughly classified into the following two types. One is a light and shade pattern formed by a portion of a nucleus (clum) where the resin fiber is melted and clarified and a mixed portion of the resin fiber and the pulp located around the nucleus. The other is a shade pattern formed by mixing molten resin and pulp. In any case, the transparency of the molded article is enhanced by the melt-cleared resin, and the melt-cleared resin is visually recognized when viewed from the outside, so that a light and shade pattern is developed. In addition, if the resin fiber is used to improve the waterproofness of the molded product, there is also a IJ point: Various pigments and dyes can be used. It is preferable to use a pigment or a dye having dispersibility or solubility in water, particularly a pigment or dye having an appropriate dispersibility or solubility in water, from the viewpoint that the dispersibility or solubility in water is more prominent. Here, “appropriate dispersibility or solubility in water” means that the pigment and the dye do not instantaneously disperse or dissolve in water. Indicators of the dispersibility or solubility of the pigment or dye in water include wettability (surface tension) and sedimentation velocity. When the dispersed state and the dissolved state of the pigment or dye are represented by the particle size, those in the range of 0.1 nm to 1 mm are preferable, and the form from the solution state to the suspension state can be used. When a pigment is used, its particle size is preferably from 1 nm to 1 mm, more preferably from 3 nm to 800 μm, and still more preferably from 5 nm to 500 m. The pigment exists in a colloidal dispersion state or a suspension state. When the dye is used, the particle size is preferably from 0.1 nm to 10 nm, more preferably from 0.1 nm to 1 nm, and the dye is present in a solution state or a colloidal dispersion state. Yes-In order to form a relatively clear shade pattern, it is preferable to use a pigment. Dyes are preferred when forming a light and shade pattern using bleeding on the entire molded article. In the present invention, it is more preferable to use a pigment as the pattern-forming component, but it is also possible to use a pigment and a dye at the same time. As the pigment used in the present invention, a papermaking pigment is used. Is preferred. Pigments for papermaking include DP Colors (Dainichi Seiki), Disperse Colors (Dainippon Ink), EMP Colors (Toyo Ink), SP Colors (Okoku Pigment), and Sandye P Colors (Sanyo Pigment) , Sandye DP Colors (Sanyo Dye), copper phthalocyanine blue, CI PIGMENT RED 254 (Toyo Ink), quino cover mouth yellow, naphthol red, and the like. The dyes are roughly classified into synthetic dyes and natural dyes, and any of the dyes can be used in the present invention. As the natural dyes, those used in foods are preferable. Plant pigments (eg gardenia, konkon, beet red, safflower, boudou, etc.), animal pigments (eg, cochineal, lacquer pigments), and microbial pigments (eg, red koji pigment, spirulina pigment) -Synthetic dyes include food dyes, cosmetic dyes, recording dyes, special coloring dyes and general dyes. Synthetic dyes for foods and cosmetics are preferred for safety: Examples of synthetic dyes for foods include azo red 2, 102, yellow 4, 5 and xanthene. Red No. 3, 104, 105, 106, Triunilmethane Blue No. 1, Green No. 3, Indigo Blue No. 2, etc. ₌ Cosmetics As a dye, Yellow dye (Rebaseruiero R), red dye (Rebaserusuka one column preparative 4 BS), a black dye (Rebaserubura click G), red yellow dye (Kayafueta preparative Orange G) such as is mentioned is _c the fibrous aggregates off b The fiber aggregate is a relatively short fiber, for example, a fiber having a length-weighted average fiber length of about 0.1 to 5 mm is a flocculant or a wet paper strength agent. And the fibers are aggregated to form aggregates longer than that, for example, amorphous or elongated aggregates of about 1.5 to 100 mm, and relatively long aggregates. Aggregates formed by physically entangled fibers are preferably used. The fibers constituting the fiber aggregate include fibers for Japanese paper such as Kozo, Mitsumata, and Kenaf, chemical pulp made from softwood or hardwood, mechanical pulp, cotton pulp, linter pulp, and the like. Natural fibers such as waste paper pulp; polyester fibers, polyethylene fibers, polypropylene fibers, polyethylene-polypropylene core-sheath fibers, rayon fibers, aramid fibers, etc. Synthetic fiber; inorganic fiber such as glass fiber and bonbon fiber; The fiber aggregate is colored with a dye aggregate and a dye or a dye. Here, being colored means that the fibers constituting the fiber aggregate are colored with the dye aggregate and / or the dye, and the fiber aggregate is formed from the colored fibers. When the fiber aggregate is formed from the fiber before being colored, and after the fiber aggregate is formed, the fiber aggregate is colored with the dye aggregate and / or the dye. Includes both cases and cases. The fibrous agglomerates during papermaking molding ί present, may prefer is that you have a Do aggregated state will'm not dissociate Parupusura in rie of the paper stock, ₌ and Do aggregated state will this Yo The shading pattern is easily formed on the surface of the resulting molded piece. The fiber coagulation (to make a book such a fiber state) Is a coagulant such as epoxidized polyamide resin, polyacrylamide, polyethylene imide, urea-formaldehyde resin, aluminum sulfate, polychlorinated aluminum, cationized starch, etc. or wet paper strength. The fiber aggregate is formed from the fiber using an agent, or the fiber is fused using a thermoplastic resin such as polyethylene, polypropylene, or polyester to form the fiber aggregate. may be - is to said pigment aggregation ί present and said dye to color the fiber aggregation ί present, is a variety of pigments and dyes are used ₌ pigments and dyes, those similar to that described above In this case, the dye aggregates are formed by forming a certain size of a block without completely dispersing or dissolving the dyes, thereby forming an aggregate structure. hand It refers to shall. The dye aggregate and the dye preferably color the fiber aggregate in a state where the fiber aggregate can be redissolved or redispersed in water when the fiber aggregate is dispersed in water. Since the dye aggregate and the dye color the fiber aggregate in such a state, the dye aggregates and the dye are removed from the fiber aggregate by parvus coagulation during papermaking of a molded article. The pulp fibers can be colored by re-dissolving or re-dispersing in the lees (in water) to impart a shading pattern to the molded product: that is, the dye aggregate or the dye is formed from the pattern forming component. The bleeding-out pigment aggregate or the pigment dyes the other material (for example, pulp) constituting the molded article to form a light and shade pattern. In order to achieve such a state, for example, various pigments such as the aforementioned papermaking pigments, inorganic pigments, and organic pigments, or the aforementioned dyes may be used as the aforementioned dye aggregates and the aforementioned dyes. Alternatively, it is also effective to use the pigment aggregate and the pigment in a powdery state, or in an aqueous slurry or paste state dispersed by a surfactant. The above-mentioned dye aggregation (the book and the dye If no sum resistance, various fixing agents (fixer) Mochiiruko and can Ru ₂ in particular also, the dye aggregates and the dye is that you have had the following properties favored arbitrariness.

(1) Good fixability to pulp to some extent-For example, in the case where a pigment is used as the pigment agglomeration or the pigment, the pigment is used as a pigment particle for a cellulose monofilament constituting a pulp fiber. Colors by adsorbing chemically or physically on the surface or in the gap between single fibers and in the gap in the paper layer.

(2) Aggregation of the fibers: The formulation liquid for coloring the fibers constituting the fibers has good fixability to some extent and low foamability. In the molded article of the present invention, one form of coloring by the fiber aggregate is aggregation and fixation. Then, if the papermaking conditions of the molded article are changed, the color forming property is changed even if the same amount of the fiber aggregate of the same color is added. _{= The} color forming property is such that the dye coagulation adsorbed on the cellulose single fiber constituting the pulp fiber. The size of the aggregate or the dye, the size of the floc, and the adsorption capacity of the floc vary greatly.- The size and flow of the dye aggregate or the dye when adsorbed on cellulose single fiber The smaller the paper size and the stronger the paper formulation, the greater the color development and the sharper the pulp fiber conditions (pulp fiber beating degree, type, Such conditions as blending), preparation conditions of papermaking raw materials (fixing conditions, additives, order of addition of additives), and papermaking conditions (type of paper machine, speed of papermaking, etc.) are appropriately controlled. The pattern forming component is added in a papermaking, dehydration or drying step. When added in the papermaking process, the pattern forming component, forming ί present with Parupusura rie without additives which may be _c or the pattern shape formed component in Parupusura Li one with pulp textiles The pattern-forming component may be added during the papermaking process.For example, when the pigment or the dye is used as the pattern-forming component as described later, the pattern-forming component may be added. It is preferable to form a molded body from the pulp slurry containing no components, and to add the pattern forming component to the pulp slurry in the process. When it is added in the dehydration step, it is added by, for example, a method of applying the pattern-forming component by droplet coating or spraying, or a method of immersing the molded body in the pattern-forming component: In such cases, the same method is used to add the pattern-forming component. When the pattern-forming component is added in the drying step, it is added before the molded body is completely dried, preferably while the water content of the molded body is 50% by weight or more. When the pattern-forming component is the fiber aggregate, the fiber aggregate has a concentration of 0.1 to 60% by weight, particularly 1 to 30% by weight in pulp slurry as a papermaking raw material. % Is preferable in terms of the appearance of light and shade patterns and the aesthetic appearance. When the pattern-forming component is the pigment or the dye, for the same reason, the concentration in the pulp slurry is 0.05 to 30% by weight, particularly 0.1 to 10% by weight. / ₀ is preferred-the pulp fiber is contained in the pulp slurry in an amount of 0.1 to 20% by weight, particularly 0.5 to 5% by weight. This is preferable in terms of the appearance of light and shade patterns, the aesthetic appearance, and the formability. As the pulp fiber, it is possible to use wood pulp such as coniferous arashi chemical pulp (Ν Β 及び Ρ) and hardwood arashi chemical pulp (LBKP) and non-wood pulp such as bamboo and straw. Possible: The length of the pulp fiber is preferably about 0.1 to 10 mm, and the thickness is preferably about 0.11 to 0.05 mm. When papermaking is performed using the slurry containing the fiber aggregate, the end of the fiber aggregate is fluffed and / or the fiber aggregate is not exposed on the surface of the molded body. However, the outline of the pattern formed by the fiber aggregates becomes unclear, and a light and shade pattern is presented on the molded body. Papermaking is performed with the pulp fibers entangled around the aggregates. As a result, in the obtained molded article, the fiber aggregate is covered with a thin film made of pulp fiber, and the fiber aggregate itself is not exposed on the outer surface of the molded article. The pattern formed by the fiber aggregates becomes a blurred gradation pattern- Also, depending on the fiber length of the fibers in the fiber aggregates, the papermaking conditions, and the slurry adjustment conditions, the end of the fiber aggregates The part becomes fluffy. Therefore, when the contour of the pattern formed by the fiber aggregates becomes blurred and becomes a gradation pattern of a blurred state ₌ this fluffy state, the fiber aggregates are formed by the thin film made of the pulp fiber described above. It may or may not be covered. The appearance of a light and shade pattern due to the fluffing of the ends of the fiber is very peculiar to the pulp molded article, and such a pattern is found in ordinary paper and paperboard. Is not presented. In order to impart a Japanese paper-like pattern to the molded body, colored Japanese paper or Japanese paper itself, etc., with a bow I cracked to an appropriate size (about 0.1 mm ² to 10 cm ² ) those in Clip-like the (generally be referred to as Japanese paper tone imparting agent), shaped bodies ₌ Japanese paper tone imparting material and admixed child to paper stock can be Ru in the papermaking process of directly or slide rie It can be added to papermaking raw materials after it is processed. When the pattern-forming component is made of a resin fiber, the resin fiber is preferably formed of a resin that melts and becomes transparent at a temperature at which the pulp fiber is not scorched by heating in the drying step of the molded body. Those composed of thermoplastic resin are mentioned. Basically, polyolefin resins such as polyethylene (Ρ （) and polypropylene (Ρ Ρ), polyesters such as polyethylene terephthalate (PET), and nylon And those composed of water (Ny), water-soluble polyvinyl alcohol (P \. 'A), etc. You. As the fiber structure of the resin fiber, a single type, a parallel type or a core-sheath type of two kinds of compositions (for example, PP / PE or PETZ low melting point PET) are used. The fiber length of the resin fiber is preferably about 1 to 50 mm, and the fiber diameter is about 0.1 to 33 dtex, since it is easy to make paper and form a light and shade pattern. When the resin is used, the resin fiber, especially the heat-fusible synthetic fiber is not melted or softened to a transparent or translucent state by heating the molded article to a predetermined temperature in the manufacturing process of the molded body. As a result of the change in light transmittance, a beautiful light and shade pattern appears. In addition, synthetic resin particles can be used instead of or together with the synthetic fibers.However, from the viewpoint of dispersibility in the raw material liquid, papermaking properties, and ease of forming fiber aggregates, It is preferable to use resin fibers. However, when a dot-like pattern is formed, it is advantageous to use synthetic resin particles. The pulp slurry used as a raw material for papermaking includes, in addition to the above-mentioned components, inorganic fillers such as myric, glass, titanium oxide, and carbon; metal fillers such as gold foil, silver foil, and aluminum foil. It can also contain flakes, powders, etc. of synthetic resin materials: these components weigh 0.1 to 30 in the pulp slurry. /. , In particular from 0.5 to 1 0 using Parupusu La rie favored correct _c above in terms of designability and beauty粧性this and force appearance that is contained by weight% as a paper stock, known production methods Then, a pulp molding is formed. Pulp molding Molding Various methods can be used according to the shape of the molded article to be molded ₌ for example, a tray with a shallow bottom or a dish-shaped molding. In the case of manufacturing a metal mold, a press mold consisting of a male mold and a female mold can be used, and the rising angle of the side wall is almost a right angle and the height is high (deep bottom). In the case of manufacturing the same, it is preferable to use the manufacturing method described in Japanese Patent Application Laid-Open No. 11-114,267 filed by the applicant of the present invention. In particular, when the pigment or dye is used as the pattern forming component, the pulp slurry is supplied to the papermaking mold while sucking the papermaking mold to deposit pulp fibers on the papermaking surface of the papermaking mold. After a lapse of a predetermined time from the start of the supply of the pulp slurry, it is preferable to supply the pigment or dye to the papermaking mold continuously or intermittently while depositing the pulp fibers. By appropriately controlling the timing of supplying the dye into the papermaking mold and the supply pressure of the pulp slurry, it is possible to form a light and shade pattern. At this time, by selectively and strongly suctioning only a specific portion of the papermaking mold, a light and shade pattern can be selectively formed at a molding portion corresponding to the specific portion. Furthermore, as described above, when a pigment or dye having low dispersibility or solubility in water is used, the pigment or dye is gradually dispersed or dissolved in the pulp slurry, so outstanding and this to obtain a molded product can be Ru ₌ also, the pattern when forming component and to use the fiber aggregate, Parupusura Li obtained the fiber aggregate are dispersed in water together with the pulp fibers - Is supplied to the papermaking mold while sucking the papermaking mold, and pulp fibers are deposited on the papermaking surface of the papermaking mold to form a molded body. Thus, the fiber aggregation (the large number of fluffs described above in the book) is achieved. This causes the outline of the fiber aggregate to be blurred and a light and shade pattern to develop, and in addition, the dye aggregate and the dye or the dye coloring the fiber aggregate are removed from the fiber aggregate during papermaking. Pulp fibers gradually ooze out A tint pattern can also be produced by coloring the pulp. In this case, a single pulp slurry may be used, or multi-layer papermaking may be performed using two or more pulp slurries: When performing multi-layer papermaking, a pulp slurry not containing the above-mentioned pattern forming component is used as the pulp slurry for forming the inner S, and a pulp slurry containing the above pattern forming component as the pulp slurry for forming the outer layer is used. Preference is given to using a force or a slurry which is free of pulp and contains said pattern-forming component: In order to disperse the fiber aggregate together with the pulp fiber, for example, a crushed material obtained by previously crushing the fiber aggregate to a predetermined size, or a slurry in which the crushed material is dispersed in water, is used. A method such as adding to a slurry of pulp fiber is used. As another preferred method for producing the pulp mold of the present invention, a first pulp slurry and a second pulp slurry having a different color from the first pulp slurry are used. There is a method in which slurry is supplied to the papermaking mold simultaneously or sequentially by means of different slurry supply means, for example, a first filling nozzle and a second filling nozzle different therefrom-two kinds of pulp slurries are supplied simultaneously Whether they are fed sequentially or sequentially is appropriately selected according to the form of the target pattern. However, if they are fed simultaneously, the first pulp slurry and the second pulp slurry in the papermaking mold do not match. There is an advantage that a uniform random pattern with good balance can be formed because of uniform mixing, and there is an advantage that the paper making time is shortened and the productivity is improved. In the case of sequential supply, it is preferable to use the following method (1) or (2), since the obtained light and shade pattern has a texture.

(1) The second pulp slurry is supplied after the first pulp slurry is supplied and before the pulp sedimentary layer derived from the first pulp slurry is formed on the entire papermaking surface of the papermaking mold. Supply.

(2) A second pulp slurry formed after the pulp sedimentary layer derived from the first pulp slurry is formed on the entire surface of the papermaking surface of the papermaking mold, and a part of the pulp sedimentary layer is later flooded. Flood the second pulp slurry while it is thick enough to be pierced by the pulp slurry supply: the first pulp slurry and the second pulp slurry are mutually sticky. The use of different degrees of strength is preferable because both pulp slurries are mixed unevenly to form a textured rich and light pattern. In this case, the viscosity difference between both pulp slurries is 0.1 to 199 mPas at 20 ^C C. In the case of 0.2 to 100 OmPas, an independent light and shade pattern derived from each pulp slurry is formed, and a very light and dark ink-like pattern as a whole is formed. It is even better. In the case of supplying both pulp slurries one after another, supplying pulp slurry with low viscosity first and then supplying pulp slurry with high viscosity at the same time creates a very thick pattern. Sile preferred from the viewpoint that is, ₌ the viscosity of both Parupusura rie itself.. (2 ^0: C) is higher viscosities 2 0 to 2 0 0 0 m P the as, in particular 2 0-1 0 It is preferably 0. 0 mPas, and the lower viscosity is preferably 0.5 to 1.99 mPas, particularly preferably 1.0 to 1.90 mPas: pulp la The viscosity of the reel was measured using a small vibrating viscometer CJV5000 (manufactured by AAndy). As still another preferred method of producing the pulp molded article of the present invention, a first pulp slurry containing the pigment aggregate and the fiber aggregate colored by Z or the pigment is provided. The pulp slurry obtained by heterogeneously mixing and dispersing a second pulp slurry having a different color from the first pulp slurry is supplied to a papermaking mold, and a molded article is formed on the papermaking surface of the papermaking mold. There is a way to do that. Specifically, the dye aggregates and / or fiber aggregates formed by agglomeration of relatively short fibers which are colored by the dye and which are aggregated by the action of the flocculant or the wet strength agent are used. The first pulp slurry containing the first pulp slurry and the second pulp slurry which is not colored or is colored in a different color from the first pulp slurry are mixed and dispersed unevenly under gentle stirring conditions. Get a pulp slurry. Papermaking is performed using this pulp slurry. As an example of a non-uniform mixing / dispersing method, there is a method in which stirring is performed at a rotation speed of about 5 to 60 rpm using a three-bladed screw. As another example of the first pulp slurry, the dye aggregates and / or A pulp slurry containing a fiber aggregate formed by entanglement of a long fiber of about 2.5 to 5 Omm, which is colored by the above-mentioned coloring matter, may be mentioned. The second pulp slurry may or may not contain fiber aggregates: and the second pulp slurry does not contain any fiber aggregates In this case, a dispersant such as polyethylene oxide, polyethylenimine, or smelt is added to the pulp slurry to uniformly disperse the pulp in the pulp slurry. The non-uniform mixing with the pulp slurry becomes more remarkable, and the shading pattern of the obtained molded product becomes more prominent. Another preferred method for producing the pulp molded article of the present invention includes: a first pulp slurry containing the pigment aggregate and / or the fiber aggregate colored by the pigment; There is a method in which a second pulp slurry different in color from the first pulp slurry is supplied almost simultaneously to a papermaking mold to form a molded body on the papermaking surface of the papermaking mold. According to this method, the first pulp slurry and the second pulp slurry are non-uniformly mixed and dispersed in the papermaking mold, so that the resulting molded article has a shaded shape. As the first pulp slurry and the second pulp slurry used in this method, the same ones as described above can be used. A shading pattern is formed on the surface of the molded sample manufactured in this manner. The type of the pattern varies depending on the type of the pattern forming component and the method of manufacturing the molded article. Typical patterns include a mottled pattern, a dot pattern, a cloud dragon pattern, a marble pattern, and a gradation pattern. In particular, when a pigment or a dye having low dispersibility or solubility in water is used as the pattern-forming component, a gradation pattern is easily formed. Association, 1992 1 January 15th, W No. 63, 116, 127-129, 218, 236, 289-292, etc. described in No. 63, and the pigment is used as the pattern forming component. The use of the above-mentioned fiber aggregate in which the pigment is colored and the pigment exists in a state capable of being redissolved or redispersed in water tends to form a cloud dragon pattern. The cloud dragon pattern is a pattern of cloud dragon paper, which is a type of Japanese paper: cloud dragon paper is a paper that shows a cloud pattern by scattering long fibers of torn mulberry on ground paper of mulberry or mitsumata. "Washi Cultural Dictionary," p. 37 (Author: Yasuo Kume, published October 1, 995, Wagamido Co., Ltd.) and the above-mentioned "Heisei no Shimaki"]: According to the molded article of the present invention The formation of the body and the formation of the shading pattern are performed simultaneously. This is completely different from, for example, bending a patterned paperboard to form a container or the like. Further, according to the molded article of the present invention, the light and shade pattern becomes continuous, there is no seam, and the appearance impression is good. In contrast, bending a patterned paperboard to form a container or the like will result in cuts in the pattern-to impart water resistance to the molded body or to reduce For the purpose of imparting gloss, after drying the molded body, the surface of the molded body may be covered with a thin transparent resin film or a transparent resin liquid may be applied to the surface of the molded body. Molded articles are used as objects such as bottles, box-shaped carton-shaped hollow containers, caps, spoons, lids, cups, etc. used for storing liquids and powders, and objects such as figurines. Various shapes that can be freely designed are available. Example

Hereinafter, the present invention will be described in more detail with reference to Examples. Unless otherwise specified, “%” means “% by weight”. (Example 1)

Pulp slurry containing 1.0% of coniferous arashi chemical pulp (NBKP) was used as a raw material for papermaking, and pulp was prepared according to a production method described in Japanese Patent Application Laid-Open No. H11-114,267. A tor pulp molded article was obtained. In this production method, 50 g of blue pigment (copper phthalocyanine blue 1% aqueous solution) was injected in three stages at 5 second intervals after 3 seconds from the supply of the pulp slurry. _c in the pulp molding de molded body obtained, the surface of the white areas of the molded body is shading pattern blue Guradeshi ® emission tone was Rere are irregularly formed Te

(Example 2)

A slurry containing 1.0% of coniferous pulp (NBKP) was prepared. Next, a pulp slurry was prepared by dispersing the azo fiber aggregates colored red with a red dye (Rebasal Scarlet 4BS) to a concentration of 10% in this slurry. did. The aggregate state of the azo fiber aggregate was reinforced with a commercially available wet strength agent to suppress the dissociation in water. The obtained pulp slurry is used as a raw material for papermaking, according to the production methods described in JP-A-11-131424 and WO099Z426661, respectively. According to the method described above, a bottle-like pulp molded body was obtained. In addition, the red dye was colored to the azo fiber cohesion single in a state where it could be redissolved (redispersed) in water.

In the pulp molded body obtained in this way, a cloudy-dragon-like shading pattern was irregularly formed on the surface of the light-pink ground molded body:

(Example 3)

Kinophthalone yellow is used as the yellow pigment, and naphthol red is used as the red pigment. The former is the latter, and the latter is mixed at a ratio of 92: 8 (2% by weight). The leaf arashi chemical pulp (NBKP) was colored orange. Polyacrylamide was added to the pulp slurry containing 3% of NBKP at 1 o / o with respect to the weight of NBKP to obtain a first pulp slurry containing fiber aggregates. Separately, a second pulp slurry was obtained containing 1% of chemical pulp (NBKP) from coniferous wood: a first pulp slurry, one liter of pulp slurry, and a second pulp slurry. The knives were placed in a container with a volume of 20 liters, and the three blades were rotated at 5 to 60 rpm and gently stirred to mix and disperse them unevenly. . Thereafter, in the same manner as in Example 1, a bottle-like pulp mold molded body having irregularly formed orange marble tone patterns on the surface of a pale yellow ground was obtained.

(Example 4)

Fiber bundles were physically formed by entanglement of 10 mm long fibers colored blue with a blue pigment (copper phthalocyanine). This fiber aggregate is added to a pulp slurry containing 1% of coniferous chemical pulp (NBKP) by 10% based on the weight of NBKP, and a first pulp slurry containing the fiber aggregate is added. I got Thereafter, in the same manner as in Example 1, a bottle-like pulp molded article was obtained in which a cloud-like shade pattern of blue fiber aggregates was irregularly formed on the surface of the light-blue ground:

(Example 5)

Polyethylene oxide was added to the second pulp slurry in Example 3 at 3% of the weight of NBKP to disperse NBKP more evenly. Except for this, in the same manner as in Example 3, a bottle-shaped pulp molded article in which an orange dot-like light and shade pattern was irregularly formed on the surface of a pale yellow background was obtained. (Example 6)

The first slurry and the second slurry in Embodiment 3 Was supplied to the papermaking mold almost at the same time, and both pulp slurries were mixed and dispersed unevenly in the papermaking mold-except that white and orange colors were exposed on the surface in the same manner as in Example 3. Obtained a bottle-shaped pulp molded body with irregularly formed marble-like shading patterns ₌ industrial applicability

According to the present invention, a pulp molded article having various patterns and excellent appearance and aesthetics is provided.- In particular, the pattern-forming component has a dispersibility or solubility in water. The use of pigments or dyes having a pigment facilitates the formation of gradation-like light and shade patterns, and the use of pigment aggregates and / or fiber aggregates colored with pigments provides a cloud-dragon-like appearance. A light and shade pattern is easily formed.

Claims

The scope of the claims

1. In the papermaking, dehydration or drying step, the pattern-forming component is added to one or more colors by adding the pattern-forming component, and the colored pattern-forming component is non-uniformly dispersed to form a color based on the pattern-forming component. Molded pulp having a light and shade pattern on the surface.

2. The pulp molded article according to claim 1, wherein the light and shade pattern is any one of a hue gradation, a lightness gradation, and a saturation gradation or a combination of any two or more thereof.

3. The pulp molding according to claim 1, wherein the pattern-forming component comprises a pigment aggregate and / or a fiber aggregate colored with a pigment, a pigment, a dye, a resin fiber, or a resin granule. Molded body.

4. The pattern according to claim 1, wherein the pattern-forming component is also present inside the thickness direction, and the pattern-forming component present inside when viewed from the outside is visually recognized to express the light and shade pattern. The pulp molded article according to the above item.

5. The pattern formation consists of the dye aggregate or the fiber aggregate colored by the dye, and the dye aggregate or the dye oozes out of the pattern forming component to ooze the dye aggregate. The pulp mold molding according to claim 1, wherein the light and shade pattern is expressed by agglomeration or the coloring of another material constituting the pulp molding. one

6. The method for producing a pulp molded article according to claim 1, wherein the pigment aggregate and the 凝集 or the fiber aggregate colored by the pigment are dispersed in water together with the pulp fiber. The obtained pulp slurry is supplied to a papermaking mold, and pulp fibers are deposited on the papermaking surface of the papermaking mold to form a pulp slurry. Manufacturing method of a molded product.

7. The method for producing a pulp molded article according to claim 1, wherein the pulp slurry is supplied to a papermaking mold to deposit pulp fibers on a papermaking surface of the papermaking mold, and After a lapse of a predetermined time from the start of the supply, a method for producing a pulp molded article in which a pigment or a dye is continuously or intermittently supplied to the papermaking mold while depositing the pulp fiber:

8. The method for producing a pulp molded article according to claim 1, wherein the first pulp slurry and the second pulp slurry having a different color from the first pulp slurry are provided. A method for producing a pulp molded article which is simultaneously or sequentially supplied to a papermaking mold by different slurry supply means.

9. After the flooding of the first pulp slurry and before the pulp sedimentary layer derived from the first pulp slurry is formed on the entire surface of the papermaking surface of the papermaking mold, the second pulp slurry is used. Or after a pulp deposited layer derived from the first pulp slurry is formed on the entire surface of the papermaking surface of the papermaking mold, and a part of the pulp deposited layer is supplied later. 9. The method for producing a pulp molded article according to claim 8, wherein the second pulp slurry is supplied when the second pulp slurry is thick enough to be broken through by the supply of the second pulp slurry.

10. The method for producing a molded pulp molded article according to claim 8, wherein the first pulp slurry and the second pulp slurry having different viscosities are used.

11. The method for producing a pulp molded article according to claim 1, wherein the pulp molding comprises a pigment aggregate and a fiber aggregate colored by a pigment.

A first pulp slurry and a second pulp slurry different from the first pulp slurry. A method for producing a pulp molded article, wherein a pulp slurry obtained by heterogeneously mixing and dispersing a pulp slurry is supplied to a papermaking mold and a molded article is formed on the papermaking surface of the papermaking mold.

12. The method for producing a pulp molded article according to claim 1, comprising: a first pulp slurry containing a pigment aggregate and a fiber aggregate colored by Z or a pigment; A method for producing a pulp molded article in which a second pulp slurry of a different color from the first pulp slurry is supplied almost simultaneously to a papermaking mold to form a molded article on the papermaking surface of the papermaking mold.