JPH01124556A - Box for preventing liquid spill - Google Patents

Abstract

PURPOSE:To prevent liquid from spilling out of a box and contaminating other products by placing a water absorption sheet inside a box. CONSTITUTION:A water absorption sheet is placed on the inner walls of a box. A water absorption sheet forming an anti-liquid-spill box 1 absorbs and holds water spilled out of a damaged product in order to keep other products away from the spilled liquid. A desirable example of this sheet is made of absorbent polymer complex 3 and another is made of absorbent complex 7. Another desirable example is made of two sheets 4-c and 4-a, at least one of which is permeable, and absorbent resin 4-e is sealed in a bag-shaped space 4-a (this is called a separate-sealing type absorbent sheet 4). Absorbent polymer complex 3 is obtained by soaking or applying aqueous solution of ethylene unsaturated monomer to form absorbent polymer on a fibrous or sponge-like base, causing polymerization of them.

Description

BACKGROUND OF THE INVENTION Technical Field The present invention relates to packaging boxes. More specifically, the present invention relates to a packaging box provided with a water absorbent sheet on the inner surface.

When transporting conventional products, it is necessary to prevent the products from being damaged by vibrations, shocks, etc. during transport.

Therefore, it has been conventional practice to package products in boxes made of cardboard, paperboard, or the like. Even products filled with liquid substances in containers that are easily damaged or deformed, such as glass bottles and tubes, are often packed and transported in boxes such as cardboard, but in such cases, Vibrations and shocks during transportation can damage or deform the container, causing the contents to spill out.

The spilled liquid not only stains other products in the same packaging box, but also easily oozes out of the packaging box and contaminates other packaging boxes and the surrounding area. This is especially a problem if hazardous chemicals or flammable liquids leak out. However, at present, there are almost no measures taken against spilled liquids, and although some methods include shrink-wrapping the entire packaging box, shrink-wrapping machines are expensive, and This method is not often practiced, partly because it cannot be applied to large boxes.

[Summary of the invention]

The present invention aims to provide a solution to the above problem,
This objective is achieved by having the water-absorbing sheet absorb the liquid material that has flowed out.

That is, the leak-proof packaging box according to the present invention is characterized in that a water-absorbing sheet is provided on the inner surface of the packaging box.

Effect: The leak-proof packaging box of the present invention prevents liquid from penetrating the outside of the box and staining other products if the packaged product is damaged by vibration or shock during transportation and the product leaks. prevent. Therefore, if used as a packaging box for liquid products that are housed in breakable containers such as glass bottles, it is effective in preventing liquid leakage. Furthermore, if a water-absorbent sheet is laminated or pasted on the packaging box at the factory manufacturing stage, the time and effort required during packaging will not increase.

[Detailed description of the invention]

Water-absorbing sheet The water-absorbing sheet forming the leak-proof packaging box according to the present invention is as follows:
This product absorbs and retains the moisture that flows out from damaged liquid products to prevent other products from getting wet when the liquid product is damaged. Preferred specific examples of such water-absorbent sheets include one made of a water-absorbing polymer composite [described below (A)] and one made of a water-absorbent composite [described later (B)].
], and one of the other preferred specific examples is one in which a water-absorbing resin is sealed in a number of compartmented bag-like spaces provided between two sheets, at least one of which is water permeable. (hereinafter referred to as sachet-shaped water-absorbent sheet) [described later (C)
]. In addition, "composed of a water-absorbing polymer composite"
This indicates that other materials may be included in addition to the water-absorbing polymer composite as long as the effects of the present invention are observed. This also applies to water-absorbent sheets with a water-absorbency of 7M and water-absorbent sheets made of water-absorbent sheets and sachet-shaped water-absorbent sheets.

Typical examples of such other materials include water-permeable sheets and water-impermeable sheets.

Hereinafter, the present invention will be described in detail with reference to the drawings.

(^) Water-absorbing polymer composite Figure 2 shows a cross section of a leak-proof packaging box according to the present invention in which a water-absorbing polymer composite is used as the water-absorbing sheet.

The water-absorbing polymer composite 3 forming the water-absorbing sheet in the leak-proof packaging box according to the present invention is prepared by impregnating or coating a fibrous substrate or a sponge-like substrate with an ethylenically unsaturated monomer to form a water-absorbing polymer as an aqueous solution. It is obtained by polymerizing it.

(A-1) Fibrous substrate or sponge-like substrate The fibrous substrate to be impregnated with or coated with the ethylenically unsaturated monomer aqueous solution is, specifically, one formed by loosely forming fibers, such as a pad, carding, or air-laying. woven web, tissue paper, woven fabric such as cotton gauze, knitted fabric, or non-woven fabric. A "formed" fibrous substrate is defined as a web that is already in the form of a web, even though cutting, joining, shaping, etc. may be required to incorporate the fibrous substrate into an article. Forming operations refer to those that do not require further application.

It is generally preferred to use absorbent fibers, such as wood bulb, rayon, cotton, other cellulosic fibers, and/or polyester fibers as the main component in the fibrous substrate. However, other types of fibers, such as polyethylene, polypropylene, polystyrene, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyurea, polyurethane, polyfluoroethylene The molded fibrous substrate may include fibers such as polycyanide, vinylidene polycyanide, and the like.

Further, the sponge-like substrate used in the present invention is a polymeric foam such as polyvinyl acetal sponge, rubber sponge, polyethylene foam, polypropylene foam, urethane foam, etc., and has a continuous network porous structure. Either is fine as long as it is.

(A-2) Water-soluble ethylenically unsaturated monomer The water-soluble ethylenically unsaturated monomer to be impregnated or applied to the fibrous substrate or sponge-like substrate should be a water-soluble ethylenically unsaturated monomer that can be converted into a water-absorbing polymer and has good water absorption properties after polymerization and drying. Any material may be used as long as it provides performance.

Water-soluble monomers that provide such performance include carboxylic acids or (and) salts thereof, phosphoric acids or (and) as functional groups.
and) salts thereof, water-soluble ethylenically unsaturated monomers having groups derived from sulfonic acids or (and) salts thereof. Specific examples include (meth)acrylic acid or a salt thereof, vinylsulfonic acid or a salt thereof, vinylphosphonic acid or a salt thereof, and the like. Among these, (meth)acrylic acid or a salt thereof is particularly preferred. The resulting polymer may be a homopolymer or copolymer of these monomers, or a graft polymer to starch or cellulose.

Furthermore, it is also possible to add crosslinking agents and additives to these monomers to improve absorption performance. As the crosslinking agent, water-soluble polyfunctional ethylenically unsaturated monomers such as methylene bisacrylamide, ethylene glycol di(meth)acrylate, and polyethylene fluoride di(meth)acrylate, ethylene glycol diglycidyl ether,
In polyglycidyl ethers such as polyethylene glycol diglycidyl ether, polyols such as glycerin and pentaerythritol, and polyamines such as ethylenediamine, two or more functional groups that can react with functional groups such as carboxylic acid, phosphoric acid, and sulfonic acid are white. Water-soluble compounds and the like can be suitably used.

An aqueous solution of such monomers may be applied to a fibrous or sponge-like substrate by any convenient means or manner as long as the monomers are maintained uniformly dispersed on the fibrous substrate and can be polymerized. be able to. One typical means for this purpose is to impregnate the fibrous substrate or the like with an aqueous monomer solution or to spray the monomer aqueous solution onto the fibrous substrate or the like.

Note that the monomer aqueous solution may contain a small amount of a water-soluble organic solvent dissolved therein, if desired.

(A-3) Production of water-absorbing polymer composite The step of polymerizing monomers uniformly dispersed on such a fibrous substrate or sponge-like substrate may be any suitable step. A typical method for such a method is one based on the action of a water-soluble radical polymerization initiator, specifically, a radical polymerization initiator is added to an aqueous monomer solution, and then the radical polymerization initiator is added to a fibrous or sponge-like substrate. Alternatively, the radical polymerization initiator can be applied as a solution separate from the monomer to the fibrous substrate, etc. after the monomer aqueous solution has been applied, by spraying, etc., and the radical polymerization initiator can be decomposed on the fibrous substrate, etc. The radical polymerization initiator is applied to a fibrous substrate as a solution separate from the monomer, and the aqueous Hemotsummer solution is applied thereto uniformly by spraying, coating, etc. Another means of initiating polymerization is irradiation with high energy radiation.

The water-absorbing polymer composite thus obtained is usually dried by means such as hot air, microwaves, and infrared rays. If unreacted additives and the like remain in the composite, it is preferable to wash the composite with water or warm water prior to drying.

(B) Water-absorbent composite Figure 3 shows a cross section of a leak-proof packaging box according to the present invention in which a water-absorbent composite is used as the water-absorbent sheet. In the present invention, a "water-absorbing composite" is one obtained by attaching or enclosing a water-absorbing resin to a fibrous base or a sponge-like base, for example as shown by reference numeral 7 in the attached Figure 3. It is something. As the fibrous base or spongy base, the same fibrous base or spongy base as already described in section (A-1) can be used. The type and shape of the water-absorbing resin 4-e to be attached to or encapsulated in such a substrate are arbitrary for the intended purpose; for example, water-absorbing resins such as those described in section (C-1) below may be used. Can be done.

(C) Packed water-absorbent sheet Packed water-absorbent sheet, that is, a water-absorbent resin is sealed in a number of compartmented bag-like spaces provided between two sheets, at least one of which is water permeable. A preferred example of the water-absorbent sheet is as shown by reference numeral 4 in the attached FIG. 4.

In this figure, the sachet-shaped water absorbent sheet 4 is formed into a single sheet by dividing a large number of bag-like spaces 4-a into vertical and horizontal grooves 4-b. , a water-permeable sheet 4- constituting the surface portion not in contact with the cardboard or paperboard.
A groove 4-b is formed by pasting the water-impermeable sheet 4-c and the water-impermeable sheet 4-d to each other, and a bag-shaped space 4- having a desired space between the grooves 4-b and 4-b. a is formed,
A considerable amount of water-absorbing resin 4-e is sealed inside this bag-shaped space 4-a.

Note that the water-permeable sheet 4-C and the water-impermeable sheet 4-d can be attached by any method as long as sufficient strength can be obtained. For example, using adhesive or
Alternatively, the sheet 4-c and the sheet 4-d may be attached by heat sealing or the like.

(C-1) The type and shape of the water absorbent resin 4-e sealed in the water absorbent resin bag-shaped space 4-a are arbitrary. For example, hydrolysates of starch-acrylonitrile graft polymers, hydrolysates of cellulose-acrylonitrile graft polymers, etc.
Copolymers of n-mer and crosslinking agent, such as crosslinked polyacrylamide and its hydrolyzate, crosslinked sulfonated polyethylene, crosslinked poval, crosslinked as described in JP-A-52-14689 and JP-A-52-27455 Saponified vinyl ester-unsaturated carboxylic acid copolymer, cross-linked polyacrylate and acrylic acid-acrylic ester copolymer, cross-linked isobutylene-maleic anhydride copolymer, cross-linked polyethylene oxide, etc. can be mentioned. Further, polymers having zero self-crosslinking properties, such as self-crosslinking polyacrylic acid, resins described in Japanese Patent Publication No. 30710/1983, and polymers containing at least hydroxyl groups and carboxylade groups in the molecule, such as those described in Japanese Patent Publication No. 54-30710, 54-3799
The resin described in No. 4 may also be used. In addition, it is a water-absorbing resin obtained by polymerizing starch or cellulose, a water-soluble monomer, (or) a monomer that becomes water-soluble by hydrolysis, and a crosslinking agent as essential components, and performing hydrolysis if necessary. There may be.

The above-mentioned water-absorbing resin may be used alone or in combination of two or more kinds, or may be a water-absorbing polymer composite as described above. Water absorption performance is 20-2000g
/sr is preferable. Moreover, there is no particular limitation on the shape of the water-absorbing resin 4-e; 1. It may be in any form such as powder, particulate, flake, or fiber.

(C-2) Water-permeable sheet The water-permeable sheet 4-c used in the present invention may be, for example, a sufficiently fine nonwoven fabric made of a thermoplastic material, or a thermoplastic sheet that has been made water-impermeable and then electrified. Any suitable material can be used, such as one in which fine communication holes are provided by radiation irradiation or the like.

Note that this water-permeable sheet 4-c does not need to consist of only a single sheet; if the desired water-permeability can be obtained in the end, this water-permeable sheet 4-c may be further laminated with other water-permeable sheets. or other materials, such as reinforcement,
An adhesive material or the like may be provided on the entire surface or a portion of the sheet.

The portion exhibiting water permeability does not need to be the entire surface of the sheet, and may be only a portion of the sheet.

In addition, a sheet similar to this water permeable sheet 4-c is
It can be used as a water-permeable sheet 5 that is used as necessary in a leak-proof packaging box as shown in FIGS.

Liquid Leak Prevention Packing Box The liquid leak prevention packaging box 1 according to the present invention has a water-absorbing sheet provided on the inner surface of the packaging box. Here, the "inner surface of the packaging box" refers to the surface or portion that becomes the inside of the box when the product is actually packed.

BACKGROUND OF THE INVENTION Many conventional packaging boxes are often manufactured by cutting box materials such as cardboard, paperboard, etc. according to the development diagram of the box, and then assembling them. The leak-proof packaging box according to the present invention is similar to a conventional packaging box except that the inner surface is provided with a water-absorbing sheet, and therefore, it can be manufactured using the same box materials and methods as the conventional packaging box. It can be manufactured. When manufacturing a packaging box according to the present invention according to this method, the water absorbent sheet may be provided before the box material is cut, after the box material is cut, or after the box is assembled. From the viewpoint of efficiency of packing work, it is preferable to provide the water absorbent sheet before assembling the box.

Note that it is not necessary to provide the water-absorbent sheet on the entire inner surface of the packaging box or on all the parts that will become the inner surface when assembled; if the intended purpose of the present invention is to be achieved, it is not necessary to provide the water-absorbing sheet on only one part. It may be.

As mentioned above, the water-absorbing sheet used in the present invention may be a laminated sheet or a sheet using other purpose-oriented sheets, materials, etc., as long as the effects of the present invention are achieved. . Specific examples of such auxiliary sheets and materials include, for example, a water-permeable sheet 5, a water-impermeable sheet 6, and the like.

Such a water-permeable sheet or water-impermeable sheet is preferably laminated on the water-absorbing sheet in order to prevent the water-absorbing resin from scattering and to prevent liquid from leaking to the outside of the packaging box. in this case,
A water-permeable sheet must be provided on the side of the water-absorbent sheet that comes into contact with the product so that the water-absorbent sheet can absorb liquid leaked from the packaged product.On the other hand, a water-impermeable sheet is
In order to prevent the liquid absorbed by the water absorbent sheet from permeating into the box material, it is necessary to provide it on the box material side of the water absorbent sheet.

Attaching the box material to the water-absorbing sheet and any auxiliary sheets used as needed can be done by any method as long as it does not substantially impede water absorption, such as using adhesive. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a specific example of a leak-proof packaging box according to the present invention. Figures 2 to 4 show a cross section of a packaging box in a preferred embodiment of the leak-proof packaging box according to the present invention. FIG. 3 shows the case where a water-absorbent sheet made of a water-absorbing composite is used, and FIG. 4 shows the case where a sachet-shaped water-absorbent sheet is used. 1...Leak-proof packaging box, 2...Cardboard, 3...
・Water-absorbing polymer composite, 4...Water-absorbing sheet in the form of sachets,
4-a... Bag-shaped space part, 4-b... Groove part, 4-c.
...Water permeable sheet, 4-d...Water impermeable sheet, 4-
e...Water absorbent resin, 5...Water permeable sheet, 6...
Water-impermeable sheet, 7... water-absorbing composite. Applicant's agent Mr. Sato

Claims (1)

[Claims] 1. A leak-proof packaging box, characterized in that a water-absorbing sheet is provided on the inner surface of the packaging box. 2. The water-absorbing sheet is a water-absorbing polymer composite obtained by impregnating or coating a fibrous substrate or sponge-like substrate with a water-soluble ethylenically unsaturated monomer and then polymerizing the water-soluble ethylenically unsaturated monomer. A leak-proof packaging box according to claim 1, which comprises: 3. The leak-proof packaging box according to claim 1, wherein the water-absorbent sheet is made of a water-absorbent composite in which a water-absorbing resin is attached to or encapsulated in a fibrous base or a sponge-like base. 4. Claim 1, wherein the water-absorbing sheet is one in which a water-absorbing resin is encapsulated in a number of divided bag-like spaces provided between two sheets, at least one of which is water permeable. Leak-proof packaging box. 5. Claim 3, wherein the water-absorbing resin is obtained by polymerizing a water-soluble ethylenically unsaturated monomer.
Leak-proof packaging box as specified in Section 4 or Section 4.