JP2002052635A - Corrugated board structural sheet made of resin and container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated board structural sheet made of a resin having practically sufficient light beam barrier properties and excellent surface design characteristics as well as a container. SOLUTION: In the corrugated board structural sheet made of a resin comprising two pieces of a liner part facing each other in parallel or almost in parallel and a plurality of ribs which are arranged in parallel or almost in parallel between the liner parts and connect both liner parts together, each of the liner parts is constituted of a surface layer part having the surface of the liner part on the side where it is not opposed to the other liner part and an inner layer part which is formed of a different material from the surface layer part and is adjacent to the surface layer part, opposite to the other liner part. The total light beam permeability of the part formed of the inner layer parts of both liner parts and the ribs is 10% or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-made corrugated cardboard structure plate and a container using the same. More specifically, the present invention relates to a resin-made corrugated cardboard structure plate having excellent light blocking properties and excellent design properties, and a container using the same, which has excellent surface design properties and can suppress deterioration of contents due to light transmission.

[0002]

2. Description of the Related Art Conventionally, cardboard made of paper has been used for mail boxes. However, from the viewpoints of resource issues and environmental measures in recent years, resin-made corrugated cardboard boards have come to be used for the above applications.

[0003]

However, since the resin-made corrugated cardboard structure plate is generally excellent in light transmittance, if a container made of such a resin-made corrugated cardboard structure accommodates an article which is liable to be deteriorated or deteriorated by light, the transmitted light may be reduced. As a result, there is a problem that the contents are deteriorated and deteriorated. In order to solve this problem, a black colorant (mainly a pigment or a dye) is usually added to the resin constituting the resin-made corrugated cardboard structure plate in order to impart light-shielding properties to the resin-made cardboard plate structure. However, in this case, the entire resin corrugated board structure is inevitably black, and the resin corrugated board itself and a container made of the resin corrugated board are inferior in design and have a problem of a temperature rise due to light absorption. .

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems relating to the conventional resin-made corrugated board at the same time. The resin-made corrugated cardboard structure plate according to the first aspect is provided with two liners arranged in parallel or substantially parallel to each other and arranged in parallel or substantially parallel between the liners to connect the two liners. A resin cardboard structure plate having a plurality of ribs, wherein each liner portion has a surface layer portion having a liner portion surface on a side not facing the other liner portion, and the surface layer portion is formed of a material different from the surface layer portion. And an inner layer portion facing the other liner portion adjacent to the portion, and a portion composed of the inner layer portion and the rib of both liner portions has a total light transmittance of 10% or less. According to the above configuration, the liner portion includes the surface layer portion and the inner layer portion, and both layers are formed of different materials.
For example, an embodiment is possible in which the inner layer is colored black to impart light blocking properties to the inner layer, and the surface layer is colored other than black. Therefore, the resin-made corrugated cardboard structure plate of the present invention is excellent in surface design. In addition, the resin corrugated cardboard plate has a total light transmittance of 10% at a portion (hereinafter, referred to as an intermediate portion) composed of the inner layer portion of the liner portion and the rib.
Since it is set as follows, for example, when this corrugated cardboard structure plate is used as a wall material of a container, the penetration and penetration of light rays into the container can be suppressed, and the damage of the contents in the container due to light can be suppressed. Can be.

According to a second aspect of the present invention, there is provided a resin corrugated cardboard structure plate.
The surface layer of the liner is non-black.
According to the above configuration, light absorption by the surface layer portion of the liner portion is smaller than that in the case where the surface layer portion of the liner portion is black.
As a result, a rise in the temperature of the resin-made corrugated cardboard structure plate can be effectively suppressed even under light irradiation.

According to a third aspect of the present invention, there is provided a resin-made corrugated cardboard structure plate.
It is characterized by being composed of a propylene-based resin.
The resin-made corrugated cardboard structure plate having the above configuration is excellent in various performances such as heat-fusibility, heat resistance, water resistance, oil resistance, and chemical resistance.

According to a fourth aspect of the present invention, there is provided a container comprising any one of the above-mentioned resin-made corrugated cardboard plates. According to the above-described configuration, it is possible to provide a container in which transmission of light rays into the inside is effectively inhibited, damage to the contents due to light can be prevented, and the degree of freedom in surface design is excellent.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As a resin-made corrugated cardboard structure plate of the present invention, for example, a plate having a structure schematically shown in FIG. In the resin-made corrugated cardboard structure plate 1 shown in FIGS. 1 (a), 1 (b) and 1 (c), the liner portions 2 having substantially the same shape and substantially the same size have the same surface. They are arranged so as to face parallel or substantially parallel. A plurality of ribs 3 are provided between the facing liner portions so as to connect the two liner portions in parallel or substantially parallel to each other.
Is provided. As the rib 3, specifically, FIG.
As shown in FIG. 1 (a), one having a structure provided in a direction parallel to or substantially parallel to one direction so as to stand upright with respect to the liner portion 2, has a corrugated curved cross section as shown in FIG. 1 (b). A plate-like structure having a structure for partitioning the space between the liners 2 or a plate-like structure arranged at a certain angle with respect to the surface of the liner portion 2 as shown in FIG. And those having various structures.

FIG. 2 is a schematic sectional view of the resin-made corrugated cardboard structure plate shown in FIG. In the product shown in this figure, each of the liner portions 2 comprises a surface layer portion 21 and an inner layer portion 22, and the inner layer portions 22 and the ribs 3 are integrally formed from the same material. The surface layer portion 21 and the surface layer portion 22 of the liner portion 2 are formed at the same time by multilayer extrusion molding, and are directly joined by fusion without using an adhesive or a pressure-sensitive adhesive.

In the resin-made corrugated board according to the present invention,
The surface layer portion and the inner layer portion of the liner portion are made of different materials. Thereby, the properties (for example, light resistance, heat resistance, water resistance, oil resistance, chemical resistance, color, etc.) of the surface layer portion and the inner layer portion of the liner portion can be made different from each other. The requirement can be satisfied by any difference between the composition of the material constituting the surface layer of the liner portion and the composition of the material constituting the inner layer portion. Resin is the same,
Embodiments in which the types and amounts of additives are different are also included in the present invention.
That is, the requirement does not necessarily mean only that the resins contained in the constituent materials of the two parts are different from each other.

In order for the resin-made corrugated cardboard structure plate to have excellent light-shielding properties, the resin-made corrugated cardboard structure plate of the present invention comprises a middle portion, that is, a portion composed of inner layer portions of both liners and ribs arranged therebetween. Must have a total light transmittance of 10% or less. The total light transmittance of the intermediate portion is preferably 5% or less. The total light transmittance of this intermediate part is 10%
When the temperature exceeds the limit, a considerable amount of light is transmitted through the resin-made corrugated cardboard structure plate. Deterioration or deterioration of the contents may occur.

The total light transmittance of 10% or less can be usually achieved by coloring at least the inner layer portion of the liner portion to black or a color close to black, but the total light transmittance of the intermediate layer is 5%. In order to achieve the following, the inner layer of the liner is preferably colored black.

In the resin-made corrugated board according to the present invention,
The surface layer portion of the liner portion may be black, but is preferably non-black, that is, a color other than black (eg, yellow, blue, green, red, etc.). A resin-made cardboard having a non-black surface layer hardly absorbs light, so that the temperature rise of the resin-made cardboard structure plate is effectively suppressed even under light irradiation. Therefore, in a container constituted by a resin corrugated board having a non-black surface layer, a rise in temperature inside the container is suppressed. When the surface layer of the liner is non-black, it is advantageous in that it is easy to further decorate the surface of the surface.

Examples of the resin used for the resin-made corrugated board of the present invention include low-density polyethylene, high-density polyethylene, ultra-high-density polyethylene, propylene polymer (polypropylene), propylene copolymer, vinyl chloride polymer, Vinyl copolymer, styrene polymer, styrene copolymer, methyl methacrylate polymer, methyl methacrylate copolymer, ethylene / acetate copolymer, acrylic / butadiene / styrene copolymer, polyamide,
One or a mixture of two or more selected from various thermoplastic resins such as polycarbonate, polyethylene terephthalate, polyphenylene oxide, polyether sulfone, polyarylate, polyether ether ketone, and polymethylpentene, epoxy resin, unsaturated polyester resin, and phenol One type or a mixture of two or more types selected from a resin and a thermosetting resin such as a melamine resin.

[0015] Among the resins exemplified above, a resin having excellent integral moldability is preferable. Among resins having excellent integral moldability, a resin containing propylene as a monomer unit, for example, polypropylene or a propylene copolymer, that is, a propylene-based resin is preferable, and polypropylene is particularly preferable. This is because propylene-based resin (especially polypropylene) is excellent in various performances such as (semi) transparency, heat fusion, heat resistance, water resistance, oil resistance, chemical resistance, etc. Because it is. In order to effectively utilize the properties of the propylene-based resin, it is preferable to use the propylene-based resin in an amount of about 30% by weight or more of the total resin, and the propylene-based resin can be preferably used in combination with, for example, a polyethylene resin.

The liner portion and the rib may be made of the same material or different materials. The same applies to the surface layer portion and the inner layer portion of the liner portion. In order to increase the bonding strength between the liner portion and the rib, it is most common and useful that the inner layer portion of the liner portion and the rib are integrally formed of a material containing the same resin. .
It is preferable that the surface layer portion and the inner layer portion of the liner portion are joined without using an adhesive or a pressure-sensitive adhesive, and particularly preferably, they are fused.

An intermediate portion of the resin-made corrugated cardboard plate of the present invention;
That is, the part consisting of the inner layer part and the rib of the liner part is
In order to have a predetermined total light transmittance, it is usually made of a material colored black. Such a material can also be prepared by blending a black colorant with an uncolored resin, but using resin scraps generated in the process of manufacturing various resin products and recovered materials from the market, so-called recycled materials. Can also be prepared. Since the recycled material is usually colored in various colors, a black resin material is obtained by mixing these materials, which is suitable as a constituent material of the intermediate portion of the resin-made corrugated cardboard structure plate of the present invention. The use of recycled materials is preferred in terms of cost.

The resin constituting the resin-made corrugated cardboard structure plate of the present invention may be, if necessary, a filler such as silica, mica, or talc, or a reinforcing material such as glass fiber, carbon fiber, aramid fiber, or ultrahigh molecular weight polyethylene fiber. And various additives such as a heat stabilizer, a UV absorber, a UV stabilizer, and a colorant.

Examples of the heat stabilizer include Sumilizer BP101 (trade name, manufactured by Sumitomo Chemical Co., Ltd.), which is a phenol heat stabilizer, and Ultranox 6 which is a phosphorus heat stabilizer.
26 (trade name, manufactured by Sumitomo Chemical Co., Ltd.). Examples of the ultraviolet absorber include Sumisorb S577 (trade name, manufactured by Sumitomo Chemical Co., Ltd.), which is a benzoic acid-based ultraviolet absorber. Examples of the ultraviolet stabilizer include hanolamine-based ultraviolet stabilizer, Sanol LS-770 (trade name, manufactured by Sankyo). Examples of the coloring agent include various organic pigments and inorganic pigments.

The resin-made corrugated cardboard structure plate of the present invention can contain an antistatic agent. By having an antistatic agent, the resin-made corrugated cardboard structure plate of the present invention is prevented from being charged, and is less likely to be contaminated by dust or the like. As the antistatic agent that can be contained in the resin-made corrugated cardboard structure plate of the present invention, a kneading-type antistatic agent that is kneaded into the resin before molding, a coating that is applied to the surface of a liner portion or the like and exists as a coating film A type antistatic agent, a lamination type antistatic agent, which is previously blended in a matrix composed of various materials, processed into a film, and used as a film and adhered to the surface of the liner portion. When a kneading type antistatic agent is used, a good antistatic effect can usually be obtained by blending the antistatic agent only in the surface layer of the liner portion, and it is advantageous in terms of cost.

As the kneading type antistatic agent, for example,
It is selected from amine compounds such as stearylethanolamine, stearyldiethanolamine, laurylamine, lauryldiethanolamine, amide compounds, ester compounds such as stearyldiethanol monostearate, glycerin fatty acid esters, quaternary ammonium compounds, pyridine derivatives, carboxylic acid derivatives and the like. One type or a mixture of two or more types may be mentioned. Among the above exemplified compounds, a mixture of stearyl diethanol monostearate and glycerin fatty acid ester is particularly preferred. Examples of the polymer type antistatic agent include polyethylene oxide, polyether amide imide, ethylene oxide / epihalohydrin copolymer, quaternary ammonium base-containing (meth) acrylate copolymer, and carbobetaine graft copolymer.

The resin-made corrugated cardboard structure plate of the present invention can be formed by, for example, a method of integrally forming the whole by multi-layer extrusion or a method of forming a resin plate serving as a rib on the inner layer portion of a single liner portion prepared in advance by two-layer extrusion. It can be manufactured by a method of joining and standing, and further joining an inner layer portion of another liner portion previously formed by multilayer extrusion molding to these standing resin plates. In the latter method, the bonding between the liner portion and the resin plate for ribs can be performed by bonding with an adhesive or heat fusion. The resin-made corrugated cardboard plate of the present invention is preferably manufactured by an integral molding method using multilayer extrusion.

Further, an intermediate portion composed of the inner layer portion and the rib of the liner portion is extruded, and a plasticized resin material for the surface layer portion of the liner portion is further extruded into a sheet shape on the surfaces of the extruded inner layer portions. A method of plasticizing the resin material for the surface layer of the liner part and the resin material for the intermediate part with separate extruders, and extruding and molding both resin materials integrally with the feed block, and separately plasticizing. It is also possible to adopt a method in which a resin material for the surface layer of the liner portion and a resin material for the intermediate portion are separately extruded by a multi-manifold method, and then the two are integrated by heating.

Since the resin-made corrugated cardboard structure plate of the present invention is excellent in light blocking properties and surface design, it is useful as a material for containers (especially containers for containing contents having poor weather resistance and corrosion resistance). It is. Further, the resin-made corrugated cardboard plate of the present invention can be applied to products other than containers, for example, screens, shelves, construction boards, signboards, concrete forms, and the like.

By assembling the resin-made corrugated cardboard structure plate of the present invention as a wall material into a desired container shape, a container having excellent light blocking properties can be obtained. In the container, an excellent light blocking property is secured by an intermediate portion composed of the liner portion inner layer portion and the rib of the cardboard structure plate. In particular, a container in which the surface layer of the liner portion is non-black is excellent in that the internal temperature does not easily rise even under light irradiation. Such a container is also excellent in that the decoration of the surface is easy. Further, the container made of the resin-made corrugated cardboard structure plate of the present invention made of a propylene-based resin is excellent in various properties such as heat resistance, water resistance, oil resistance, and chemical resistance.

[0026]

According to the present invention, there is provided a resin-made corrugated cardboard structure plate having practically sufficient light-shielding properties and excellent surface design. The container using the resin-made corrugated cardboard plate as a wall material can protect an article which is liable to be deteriorated or degraded by light from light because light hardly penetrates into the container. Further, since the container of the present invention can select the material of the liner part surface layer part independently of the material of the intermediate part, the liner part surface layer part can be colored to a desired color,
Excellent surface design. For example, if a plurality of containers of the present invention having different surface layer colors are used, articles can be efficiently sorted.

[0027]

EXAMPLES The present invention will be further described below with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, in each example, the total light transmittance is JIS K7.
Measured according to Method B in accordance with 150-Revision. The device used for the measurement is an integrating sphere reflection / transmission meter (RT-100, manufactured by Lumber Technology Co., Ltd.).

Example 1 (Preparation of resin-made corrugated board) A first extruder (50 mmΦ) for extruding a material for a surface layer portion of a liner portion, and a first extruder for an intermediate portion (ie, an inner layer portion of a liner portion and a rib). Combined with the second extruder (110mmΦ) for extruding the material,
A resin-made corrugated cardboard was prepared by feed block extrusion molding. As the surface layer material of the liner part,
A resin composition obtained by blending 2 parts by weight of a yellow pigment with 100 parts by weight of polypropylene (a homopolymer manufactured by Sumitomo Chemical Co., Ltd., density: 0.9 g / cm ² , MFR: 2.0 g / 10 minutes) was used. . Further, as the material for the intermediate portion, a resin composition obtained by blending 2 parts by weight of a black pigment with 100 parts by weight of the same polypropylene as above was used. The plasticization temperature in the extruder was 220 ° C.

The cross-sectional shape of the obtained resin-made corrugated cardboard structure plate was the type shown in FIG. 1 (a), and the detailed size was as follows. Overall thickness = 5 mm, basis weight = 1.2 kg / m ² , liner section thickness = 0.30 mm, thickness of liner section surface layer = 0.05 m
m, rib thickness = 0.6 mm, rib spacing = 4.5 mm, rib height = 4.2 mm The surface layers of both liners of the obtained resin-made corrugated cardboard structure plate were removed, and the total light transmittance of the middle portion was obtained. Was measured, the total light transmittance was 1%. The resin-made corrugated cardboard structure plate was covered with a yellow surface layer, and was excellent in design.

(Preparation of Container) Using the obtained resin-made corrugated cardboard structure plate, code number 020 of JIS Z1507 was used.
4, a box having a width of 400 mm, a length of 300 mm and a height of 300 mm was produced. After putting a colored cotton cloth into the box and closing the lid, the box was left for one year in a place where sunlight was incident during the day. One year later, when the cotton cloth inside the box was observed, the same chromaticity as that at the time of enclosing was maintained.

Comparative Example 1 Using the apparatus used in Example 1, the first extruder was not operated, and only the material for the intermediate part used in Example 1 was extruded from the second extruder alone. A resin corrugated board having substantially the same size as the obtained product was produced. The obtained resin-made corrugated board had a total light transmittance of 1%. This resin-made corrugated cardboard plate was entirely black, and was poor in design.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a resin-made corrugated cardboard structure plate of the present invention.

FIG. 2 is a schematic sectional view of the resin-made corrugated cardboard structure plate of the present invention shown in FIG. 1 (a).

[Explanation of symbols]

 1: Resin corrugated cardboard plate 2: Liner 21: Surface layer 22: Inner layer 3: Rib

Continuation of front page (72) Inventor Takeshi Minaba 2-10-1, Tsukahara, Takatsuki-shi, Osaka F-term in Sumika Plastics Co., Ltd. (reference) 3E060 BC02 BC07 DA23 3E075 BA01 CA01 DD12 DD44 GA04 4F100 AK01A AK01B AK01C AK07 BA03 BA10B BA10C BA15 CA13 DA01 DA14 DC25A DD12A EH17 GB16 HB00 JB01 JB07 JJ03 JL10B JN02 YY00

Claims (4)

[Claims] 1. A resin having two liners arranged parallel or substantially parallel to each other and a plurality of ribs arranged between the liners in parallel or substantially parallel to connect the two liners. A corrugated cardboard structure plate, wherein each liner portion has a surface layer portion having a liner portion surface on a side not facing the other liner portion, and the other surface portion made of a material different from the surface layer portion and adjacent to the other. A resin-made corrugated cardboard plate comprising an inner layer portion facing the liner portion, and a portion composed of the inner layer portion and the rib of both liner portions having a total light transmittance of 10% or less. 2. The resin-made corrugated cardboard plate according to claim 1, wherein the color of the surface layer of the liner is non-black. 3. The resin-made corrugated cardboard structure plate according to claim 1, wherein the resin is a propylene-based resin. 4. A container using the resin-made corrugated board according to any one of claims 1 to 3.