JP2000238853A - Water-resistant heat-insulating cold-insulating box and member for the box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive and environment-friendly box by applying water-resistant treatment on a box or a box member comprising a low density substance with a specific density or less which is obtained by dehydrating slurry including a composition with Canada standard freeness of a specific value or higher mainly comprising a cellulose fiber by using a mesh and then drying. SOLUTION: Slurry comprising a composition with Canada standard freeness of 550 ml or more mainly consisting of a cellulose fiber is dehydrated by using a mesh and then dried, and a box or a box member made of the resulted low density substance with a density of 0.25 g/cm3 or less is subjected to water- resistant treatment. Among other things, a substance which is obtained by processing under compression conditions that a thickness of the dried low density substance may be 50% or more of the thickness of a wetted low density substance obtained by dehydrating the slurry without pressure applied is preferable. Thus a water-resistant box or box member which is environment-friendly, inexpensive and excellent in heat and cold insulation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an inexpensive and environmentally-friendly water-resistant material which is suitable for transporting or storing goods which need to keep warm and cool, especially for transporting or storing foods and processed foods having a lot of moisture. The present invention relates to a heat insulating and cooling box or box member.

[0002]

2. Description of the Related Art Styrofoam foam is generally used as a water-resistant heat-insulated box suitable for transporting or storing foods and processed foods having a large amount of water, such as a fish box. However, in the case of styrene foam, it is inexpensive and very excellent in performance, but in recent years, as interest in environmental issues has risen, as with other so-called plastic products, there has been an increase in concerns regarding the processability after use. ing. In other words, it has been pointed out that in the case of incineration after use, damage to the furnace and generation of toxic gas due to generation of high temperature. Further, when the landfill treatment is performed, it is considered to be one of the causes of shortage of the treatment plant because it is not decomposable and is bulky.

In order to solve such environmental problems, the use of a cardboard box which is easy to dispose and has an established recovery system is the most preferable at the present time. The corrugated paper used to support the front and back liners at regular intervals by rolling, that is, the core base paper is glued, so that the air in the core part is extremely easy to move and the heat insulation is low, The box thus produced was not suitable for transportation or storage of articles that require warming and cooling, such as food and processed food. As a means for solving such a problem, Japanese Utility Model Registration No. 3026196 describes that a box is formed by bonding low-density paper to corrugated cardboard. Therefore, a material which is considerably inferior to Styrofoam and is more excellent is required.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive, suitable for transporting or storing articles requiring heat insulation and cooling, particularly for transporting or storing foods and processed foods having a high moisture content. An object of the present invention is to provide an environment-friendly water-resistant heat-insulated box or box member.

[0005]

The present inventors have studied in view of the present situation, and as a result, obtained a slurry made of a specific Canadian Standard Freeness (CSF) composition by dehydrating using a mesh and then drying. The present inventors have found that by applying a water-resistant treatment to the obtained low-density body, an inexpensive and environmentally-friendly water-resistant heat-insulated box or box member can be obtained, and the present invention has been completed. That is, the present invention provides a Canadian Standard Freeness (CSF) containing cellulose fiber as a main component of 55%.
A slurry obtained by dehydrating a slurry composed of 0 ml or more using a mesh and then drying the slurry has a density of 0.25 g / c.
m ³ below the box or the box member made of a low density material, a thermal insulation cool boxes or box member of the water resistance, characterized in that subjected to waterproof treatment. Among them, those obtained by processing under compression conditions such that the thickness of the low-density body after drying is 50% or more of the thickness of the wet low-density body when the slurry is obtained by depressurizing and dehydrating the slurry are preferable. . Cellulose fiber is water repellent,
It is preferable that the cellulose fiber has been subjected to at least one of water resistance and hardening. Especially, it is preferable that a cellulose fiber is a waste paper fiber. It is preferable that the slurry composition further contains an interlayer strength enhancing material. Above all, it is preferable that the interlayer strength enhancing material is a cellulose fine fiber having a water retention of 150% or more. Further, the cellulose fiber used in the present invention is preferably mechanical pulp obtained by mechanically pulverizing wood. Also,
Preferably, the cellulose fibers are obtained by mechanically pulverizing a non-wood material. In particular, the non-wood material is preferably hemp fiber. Especially, it is preferable that hemp fiber is obtained by mechanically pulverizing a hemp bag. The drying of the wet low-density body is preferably hot air ventilation drying. It is preferable that the air flow rate of the air drying is 2 liters / cm ² · min or more.

[0006] The success of the present invention is attributed to the Canadian Standard Freeness (CSF) of 550 containing cellulose fibers as a main component.
The slurry obtained by dehydrating the slurry comprising the composition of not less than 0.1 ml using a mesh and then drying the slurry has a density of 0.25 g / cm.
By applying a water-resistant treatment to a box or box member made of a low-density body having a density of ³ or less, a water-resistant box or a low-cost, environmentally-friendly and heat- and cold-insulating material, which cannot be achieved by the prior art. That is, it has been found that it can be used as a box member.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Cellulose fibers used in the present invention include, for example, unbleached or bleached chemical pulp obtained by kraft pulping, sulphite pulping, alkali pulping of coniferous or hardwood, or GP, RMP, T
MP, mechanical pulp such as CTMP, liquid ammonia-treated pulp, mercerized pulp, cellulose fiber, cotton pulp, linter pulp, hemp and bamboo, which have been subjected to at least one of the treatments of water repellency, water resistance, and curing Fibers obtained by mechanically pulverizing non-wood materials such as sugar cane, rice straw, coconut husk, and sugar cane. Among others, 550 ml of Canadian standard freeness is preferred as a heat insulating and cooling performance.
The above are mentioned. Among them, mechanical pulp obtained by mechanically pulverizing wood and used as a raw material for fiberboard, and cellulose fiber obtained by mechanically pulverizing non-wood material, and any of water repellency, water resistance, and curing Cellulose fibers that have been subjected to at least one of the above treatments are preferred because the resulting low-density bodies are extremely excellent in performance such as heat-retaining properties. Among them, cellulose fibers are particularly preferable, in which at least one of water repellency, water resistance, and curing is performed, and thereby the adhesion phenomenon between fibers during suction and dehydration of the slurry is significantly suppressed. Above all, it is particularly preferable to use waste paper fiber as the cellulose fiber to be subjected to at least one of the treatments of water repellency, water resistance, and curing, because this leads to an increase in the use of waste paper, which is a raw material that is overstocked.

Hereinafter, the present invention will be specifically described by taking as an example a cellulose fiber which has been subjected to at least one of water repellency, water resistance, and curing, which are preferable as the cellulose fiber. However, the present invention is not limited to this. It is not something to be done.

[0009] The reagents used for the treatment of water repellency, water resistance and curing of cellulose fibers include a cellulose-reactive reagent, a water-repellent treatment reagent, a water-resistant treatment reagent, and a waterproof treatment commonly used for cellulose fiber processing. Reagents and the like can be mentioned. Among them, a fibrin reaction type reagent is most preferable in terms of the effects of the present invention.

Examples of the fibrin reaction type reagent include a fiber cross-linking agent described in US Pat. No. 2,971,815, and more specifically,
Aldehydes (formaldehyde and glyoxal,
Reaction products of formaldehyde with urea, dimethyl urea, cyclic urea, triazine, amide, acrylamide, carbamate, etc., such as dimethylol urea, dimethylol ethylene urea, Methylolmelamine, N-methylolamide, N-methylolacrylamide, ethylene-bis-N-methylolcarbamate, etc., reaction products of glyoxal and dimethylurea, divinyl compounds (eg, divinylsulfone), halogen compounds (eg, dichloroacetone, 1,2) -Dichloropropanol, 2-chloromuconic acid, cyanuric chloride, dichloroacetic acid and the like), epoxy compounds (halohydrins such as epichlorohydrin, butadiene diepoxide, polyepoxides such as polyglycidyl ether and the like) ), Aziridinyl compounds (Tris- (aziridinyl) phosphine oxide, Tris- (aziridinyl) phosphine sulfide, carbonyl-bis-aziridine, etc.), polycarboxylic acids (maleic acid, citric acid, tricarballylic acid, melitic acid, cyclo Pentanetetracarboxylic acid, etc.), acid anhydrides (phthalic anhydride, maleic anhydride, succinic anhydride, etc.), (10) polyvalent isocyanates (hexamethylene diisocyanate, 2,4-tolylene diisocyanate, etc.), (11) And quaternary ammonium salts (such as quaternary ammonium derivatives of Bis-chloromethyl ether).

Reagents used for water-repellent, water-resistant and waterproof treatments include, for example, a chemical bond type and an adhesive type. Examples of the chemical bond type include an acid chloride type water repellent and an isocyanate type water repellent. Agent, ketene dimer type water repellent, pyridine condensation type water repellent, ethylene urea type water repellent, methylol compound type water repellent, ethylene oxide type water repellent, silicon compound type water repellent, chromium complex type water repellent Agents, titanium-containing compound-type water repellents, zirconium-containing compound-type water repellents, and the like. Examples of the adhesive type include a fluorine compound type water repellent, a silicon compound type water repellent, a rosin resin, a terpene resin, a natural rubber, a synthetic rubber, a hydrocarbon resin, an acrylic resin, a vinyl acetate resin, and a vinyl chloride resin. , Polyamide resins, fats and oils (vegetable oil, animal oil, vegetable fat, animal fat), higher aliphatic compounds (saturated or unsaturated acids, alcohols, esters, amines,
Amides, salts), waxes (vegetable wax, animal wax, mineral wax, petroleum wax, modified wax) and the like.

The above-mentioned water repellent, water-proofing agent, curing agent (hereinafter, referred to as
These treating agents are collectively referred to as a modifier) alone or in combination of two or more as appropriate, and are used by melting, dissolving in a medium, mixing, emulsifying, dispersing, or the like as necessary. The amount of the modifier is not particularly limited,
Usually, it is added in the range of 0.2 to 50 parts (solid content) based on 100 parts of the cellulose fiber.

The cellulose fibers used for the denaturation treatment include unbleached or bleached chemical pulp obtained by kraft pulping, sulfite pulping, alkali pulping, etc. of coniferous or hardwood, or GP, RMP, TMP, or the like. CTMP
Pulp, cotton pulp, linter pulp, waste paper pulp and the like. As waste paper pulp,
Newspapers, books, magazines, telephone directories, catalogs, high-quality paper, packaging boxes, cardboard boxes, pulp molds, paper cushioning materials, or factories for papermaking, printing, bookbinding, boxmaking, cardboard manufacturing, etc.
Dry or wet defibration of cut paper, waste paper, etc., discharged from the business site may be mentioned.

Examples of a machine used for defibrating pulp when obtained as a sheet or the like include grinders such as a pocket grinder, a chain grinder, a ring grinder, a single disc refiner, a double disc refiner, a conical refiner, and the like. Refiners, beaters and other beating machines, blenders, deflakers, etc., stirrers, defibrators, defibrizers, etc., wood chip disintegrators, hammer mills, pin mills, and other fluffer and other flash-dried pulp manufacturing equipment And the like. Above all, dry / semi-dry defibration, which does not use water at all or uses water equal to or less than the amount of cellulose fiber (dry weight), is easier and more costly to treat denaturant or wastewater than wet defibration. Is superior and preferred. Among the defibration machines used for dry and semi-dry defibration, a hammer mill, a pin mill, and a disc refiner are preferable. Specific examples include a fiber riser manufactured by Sumikura Kogyo / Nishi Nippon R & D Co., Ltd., an impact mill manufactured by Dalton, a free crusher manufactured by Nara Machinery Works, a hammer mill, a cage mill, and an MK hammer mill manufactured by Masuko Sangyo.

The water-repellent, water-resistant and hardening treatments are carried out by bringing fibers or sheets of virgin pulp or waste paper pulp in the form of dry paper or wet paper into contact with the above modifier and reacting or adhering to the surface. This is performed by performing a drying treatment or a reaction accelerating treatment if necessary. As a method for bringing a shaped article such as a fiber or a sheet into contact with a treatment agent, for example, impregnation, coating, spraying, mixing, or the like can be used. At that time, in the process of water repellency, water resistance, and curing, the cellulose fiber obtained at least once in a dry state having a solid content concentration of 90% or more is obtained by reacting the fiber with a modifier. It is preferable because the state or the adhesion state is good and the effect of the treatment becomes particularly remarkable. still,
The fibrillation of a shape such as a sheet that has been brought into contact with the denaturing agent may be performed at any stage after the contact with the denaturing agent.

The cellulose fibers may be used alone or in combination of two or more.
It is blended in the range of 100%.

As the slurry composition, the above-mentioned cellulose fiber may be used alone if the Canadian standard freeness is 550 ml or more and a low-density body having the desired performance can be obtained. Other ingredients can be blended. At that time, the composition is selected so that the Canadian standard freeness of the whole composition is 550 ml or more. Incidentally, the Canadian standard freeness is specified in JIS-P-8121, and is usually a value indicating the drainage of pulp.
In the present invention, the drainage of materials other than the composition and the pulp-based material is determined according to the same measurement method, and the value is also referred to as Canadian standard freeness.

The addition of the interlaminar strength enhancer to the slurry composition is more preferable because the interlaminar strength of the low-density body is improved and a box or a box member with a low risk of breakage during handling is obtained. Examples of the interlayer strength-enhancing material include cellulose fine fibers, heat-fusible synthetic fibers (synthetic pulp and the like), and a paper strength enhancer known in the papermaking industry. As the cellulose fine fiber, unbleached or bleached chemical pulp obtained by kraft pulping, sulfite pulping, alkali pulping of softwood or hardwood, or mechanical pulp such as GP, RMP, TMP, CTMP, or cotton pulp Pulp, linter pulp, waste paper pulp, and other natural pulp fibers are further subjected to wet mechanical treatment with a medium agitating mill, a vibration mill, a high-pressure homogenizer, a colloid mill, a beating machine, etc. to obtain a water retention of 150% or more. . As heat-fusible synthetic fibers, for example,
Polyethylene fiber, polypropylene fiber, polyethylene-polypropylene sheath core fiber, polystyrene fiber, polylactic acid fiber, polyester fiber, aliphatic polyester fiber,
Acetyl cellulose-based fibers and the like can be mentioned. Examples of paper strength agents include, for example, urea formaldehyde resin, melamine formaldehyde resin, polyamide urea formaldehyde resin, ketone resin, polyamide epichlorohydrin resin, polyamide polyamine epichlorohydrin resin,
Resins such as glycerol polyglycidyl ether resin, polyethyleneimine resin, starch, processed starch, vegetable gum, gelatin, PVA, water-soluble binders such as CMC, vinyl acetate resin, acrylate resin, ethylene-vinyl acetate copolymer, styrene -An emulsion such as a butadiene copolymer.

Among the interlayer strength enhancing materials, water retention of 150%
The cellulose fine fibers described above are particularly preferable because they are environmentally friendly materials and have a large effect on improving the interlayer strength.
The amount of the interlayer strength enhancer to be added to the composition is not particularly limited, but is usually in the range of 1 to 40% by dry weight with respect to the composition.

Other materials to be added to the slurry composition include water-proofing agents, water-repelling agents,
Foaming agents, foaming microcapsules, sizing agents, dyes, pigments, retention aids, fillers, pH regulators, slime control agents, thickeners, preservatives, fungicides, antibacterial agents, flame retardants, antioxidants , Ultraviolet absorbers, rodenticides, insect repellents, surfactants, electromagnetic shielding materials, antistatic agents, rust inhibitors, fragrances, deodorants and the like.

The above-mentioned raw materials are blended in the slurry used in the present invention so as to have a freeness of 550 ml or more.
A composition of 0 ml or more is particularly excellent in heat retention and cooling properties and also excellent in productivity. The slurry is usually prepared batchwise or continuously using a device having a stirrer.
Water is usually used as a medium used for slurry formation. The concentration of the slurry is usually 0.05% dry solids.
It is prepared in the range of 10 to 10% by weight, but preferably in the range of 0.05 to 5% by weight in terms of the dispersion state.

The low-density material used in the present invention is not particularly limited, but usually has a thickness in the range of 2 to 40 mm. It can be manufactured by a papermaking / papermaking machine, a pulp mold manufacturing machine or the like known in the board industry. The density of what is obtained, besides the raw materials and blending of the slurry composition,
It is greatly affected by the pressure applied to the low density body in the manufacturing process. In order to obtain a material with the lowest possible density and excellent heat insulation, instead of relying on press pressure for dehydration, perform suction dehydration as hard as possible, which is less likely to be affected by density increase, or forcibly ventilate under pressure. It is necessary to keep the press pressure in the dewatering process as low as possible by installing a device that can perform the dewatering, for example. What is obtained through the step of slicing or leveling the surface of the non-contact side of the wire and the non-contact side of the wet low-density body after dehydration, is likely to have a low density because the smoothness comes out with an extremely weak press pressure, especially preferable. For slicing or leveling at this time, a water stream such as a water jet or a water curtain is effective. For the drying step, any method known in the art such as hot air drying, infrared drying, and microwave drying can be used. In particular, heating air (gas) is injected into the wet low-density body after dehydration, or Hot air ventilation drying in which the flow of air in the inter-fiber voids is improved by a method such as suctioning while introducing heated air from the opposite side of the wet low-density body is particularly preferred because of its high drying efficiency. 80 to 3 for hot air ventilation drying
Hot air in the range of 00 ° C is used. The ventilation rate of hot air ventilation drying is preferably 0.2 liter / cm ² · min or more in the early stage of drying from the viewpoint of drying efficiency, and particularly preferably 2 liter / cm ² · min or more. In order to increase the drying speed, the surface of the low-density body is further provided with patterned irregularities to increase the surface area,
Alternatively, it is also effective to pierce or non-penetrate holes in the low-density body in a pattern so that air can easily enter the inter-fiber space. As a method of providing irregularities or through holes or non-through holes in the low-density body, a method of providing irregularities on a mesh used for slurry filtration is effective. In the present invention, the pressing pressure applied to the low-density body in the dewatering and drying steps is suppressed, and the thickness of the low-density body after drying is 50 times the thickness of the wet low-density body when the slurry is obtained by depressurizing and dehydrating the slurry. % Is preferable in terms of quality such as heat insulation. Among them, a low-density body obtained by processing under a compression condition of 65% or more is particularly preferable.

In the present invention, a method of forming a rectangular parallelepiped box (excluding a lid) such as a fish box is performed by bonding one bottom plate 11 and four side wall plates 12 of FIG. 1 to the box of FIG. 1
3, the plan view 14 and the side view 15 of FIG.
A method of assembling the box member 16 (FIG. 4) represented by the following formula by bending and bonding at the V-shaped groove 17 to the box 13 in FIG. 5, and pulp the box 13 using the mold 18 in FIG. A method of forming at once by a molding method can be given.
The plate-like members (11, 12) used in the case of (1) are manufactured using a paper machine, a board manufacturing machine, or a pulp mold manufacturing machine having a mold capable of forming a plate-like product, and are obtained by cutting as necessary. be able to. Can be made at once by a pulp molding method, but a large board produced by using a paper machine or a board making machine is cut out in the shape shown in the figure, and a V-shaped groove 17 is pressed. It can be made by means such as compression using a machine or cutting out with a cutting machine. The water-resistant treatment can be applied to a material already in the form of a box or a member for a box, that is, a material before the box is formed (for example, those shown in FIGS. 1 and 4). In the present invention, the shape of the box is not particularly limited,
Examples include various shapes, such as an octagonal box 21 in FIG. 8 made by assembling the bottom plate 19 and the side wall member 20 in FIG.

Water resistance of a low-density box or box member is as follows:
Usually, it can be achieved by attaching a film to the surface. Examples of the film include polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, nylon, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate alcohol copolymer (EVAL), polycarbonate, polyester (PET),
Aliphatic polyesters, acetate and the like, among others, among others, when using a film made of biodegradable resin,
Disposal is easy and particularly preferable. Specific examples include Bionole (Showa Kobunshi), Lacia (Mitsui Chemicals), Lunar ZT (Nippon Shokubai), and the like. Further, a film having a pigment or a small hole can be used as the film. In the present invention, a film having a thickness of usually 3 to 200 μm is used. As a method of bonding, if the film has its own adhesiveness at normal temperature or under heating,
A method of laminating the film on the surface of a box or a box member, or further heating and bonding, after applying an aqueous, solvent, hot melt, or solventless adhesive or pressure-sensitive adhesive to the film surface In some cases, it is dried, and then it is superimposed on the surface of the box or the member for the box, and joined at normal temperature or under heating, or by irradiating ultraviolet rays, electron beams, or infrared rays. System, solvent-based, hot-melt-based, solvent-free adhesive or pressure-sensitive adhesive, and after drying in some cases, stack the film on the surface and apply it at room temperature or under heating or under ultraviolet light, electron beam, infrared light. Irradiation and bonding methods may be used.
Above all, a method in which a film softened by heating or the like is adhered to a low-density body while applying force and stretching is particularly preferable because a very good bonding state between the film and the low-density body is obtained. Specifically, a skin pack method or the like can be used. For the water resistance of a low-density box or box member, a substrate other than a water-resistant film,
For example, metal foil, water-resistant paper, laminating paper, or the like can be used. For applications that do not require high water resistance, a method of applying another material or spraying a material exhibiting water repellency on the surface of the low-density body can be adopted. However, workability,
The use of a film is most preferred in terms of performance and the like.

[0025]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but it should be understood that the present invention is not limited to these examples.
In Examples and Comparative Examples, “parts” and “%” refer to “parts by weight of solid content” and “% by weight” unless otherwise specified.
Is shown.

<Example 1> Non-formalin type cross-linking agent (trade name: Sumitex NF-500K, manufactured by Sumitomo Chemical Co., Ltd.)
And its crosslinking aid (trade name: Sumitex ACCELER)
ATER MX (manufactured by Sumitomo Chemical Co., Ltd.) was prepared in the form of an aqueous solution containing 5 parts and 2 parts of a solid content, respectively. Next, the used newspaper was roughly crushed to a size of about 1 cm square using a coarse crusher unit of a fiber riser manufactured by West Japan Technology Development Co., Ltd.
100 parts were put into a cement mixer, and the whole amount of the crosslinking agent solution was sprayed while stirring to uniformly wet the used paper. Subsequently, the wet waste paper is defibrated into fibers in the fine-pulverizing unit of the fiber riser, and then placed in an open container and heated in a blow dryer at 150 ° C. for 60 minutes to complete the reaction, thereby forming a crosslinked waste paper. Fiber was obtained. When the Canadian standard freeness (hereinafter, abbreviated as "freeness") of this crosslinked recycled paper fiber was measured, it was 72.
It was 5 ml. A 1.5-liter Dynomill (model: KDL-PILOT, manufactured by Shinmaru Enterprises Co., Ltd.) filled with 80% of glass beads having an average particle size of 2 mmφ is filled with an aqueous slurry of bleached kraft pulp having a solid content of 1%. ) Introducing and passing through the apparatus at 340 ml / min, number average fiber length 0.29 mm, water retention 260
% Fine fibers were obtained. 90 parts (dry weight) of the crosslinked waste paper fiber obtained as described above, 10 parts (dry weight) of fine fibers, and water were added to adjust the raw material slurry to a solid concentration of 1%. The freeness of the two types of mixed fibers was 680 ml. Next, after putting this raw material slurry into a tank of a pulp molding machine, a female mold for a shape having a plan view of FIG. 2 and a cross-sectional view as shown in FIG. 3 is immersed in the slurry and vacuumed. After suction was applied and the pulp was deposited in the mold to a level that slightly popped out of the mold, the mold was pulled up from the slurry and then inverted 180 degrees. Next, the portion of the pulp deposit that protrudes from the mold is cut off using a water curtain, and the thickness of the deposit layer is reduced to 12 mm.
mm was obtained. Thereafter, the suction is continued to reduce the water content of the molded product, and at the same time, a flat plate having small holes is pressed lightly from above, and the compressed air is maintained at the same state. And dried to obtain a dry molded product having a thickness of 10 mm, which is 83% of the thickness of the wet molded product. The density was 0.13 g / cm ³ . Next, after a 80 μm-thick bionole was stuck on the entire surface of the molded product, it was bent at a V-shaped groove as shown in FIG. A water-resistant box was obtained.

Example 2 A dry molded article having a thickness of 5.5 mm, which is 46% of the thickness of the wet molded article, was obtained in the same manner as in Example 1 except that the compression was strongly performed with a flat plate. 0.24 density
g / cm ³ . Next, after a 80 μm-thick bionole was stuck on the entire surface of the molded product, it was bent at a V-shaped groove as shown in FIG. A water-resistant box was obtained. However, the performance was considerably inferior to that of Example 1.

[0028]

As described above, the present invention has a Canadian Standard Freeness (CSF) containing cellulosic fibers as a main component of 5%.
A slurry comprising 50 ml or more of the composition is dehydrated using a mesh and then dried to obtain a density of 0.25 g /
Since the box or box member made of a low-density body having a density of not more than ³ cm ³ is subjected to the water-resistant treatment, it is effective in providing an environment-friendly water-resistant heat- and cold-insulated box or box member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing members (one bottom plate and four side walls) for forming a rectangular parallelepiped box.

FIG. 2 is a perspective view showing a box made by assembling the members shown in FIG. 1;

FIG. 3 is a plan view and a sectional view of the box member shown in the perspective view of FIG. 4;

FIG. 4 is a perspective view showing an integrated box member.

FIG. 5 is a perspective view showing a box formed by assembling the box member of FIG. 4;

FIG. 6 is a perspective view showing a mold for forming a box.

FIG. 7 is a perspective view showing an octagonal box member.

FIG. 8 is a perspective view showing a box made by assembling the box member of FIG. 7;

[Explanation of symbols]

11: bottom plate, 12: side wall plate, 13: box, 14: plan view,
15: side view, 16: integrated box member, 17: V-shaped groove, 18: mold, 19: bottom plate, 20: side wall member, 21:
Octagon box

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA11 AB01 BA05A BB13A BB22A BB30A CA07 CA30 EE32 EE38 GA01 GA06

Claims (4)

[Claims] 1. A slurry comprising a composition having a Canadian Standard Freeness (CSF) of 550 ml or more containing cellulose fibers as a main component is dehydrated using a mesh and then dried to obtain a density of 0.25 g / cm ³ or less. A water-resistant heat-insulated box or box member characterized by subjecting a box or box member made of a low-density body to a water-resistant treatment. 2. The thickness of the low-density body after drying is 50 times the thickness of the wet low-density body when the slurry is obtained by depressurizing and dehydrating the slurry.
%. The water-resistant heat-insulated box or box member according to claim 1, which is obtained by processing under compression conditions such that the amount is at least 10%. 3. The water-resistant heat-insulated box or box member according to claim 1, wherein the cellulose fiber has been subjected to at least one of water repellency, water resistance, and curing. . 4. The water-resistant heat-insulated box or box member according to claim 1, wherein the slurry composition contains cellulose-based fine fibers having a water retention of 150% or more as an interlayer strength enhancing material.