JPH084456Y2 - Paper containers that can be used as recycled paper - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container which has water resistance and oil resistance and which can be used as a recycled pulp to recycle paper and which can be recycled.

[0002]

2. Description of the Related Art Today, environmental protection on a global scale is increasing, and logging of pulp wood, which is a raw material for paper, is regulated in various places, and this tends to be insufficient, and the price thereof continues to rise. There is. Under such circumstances, recycled paper produced by recovering waste paper and using it as a raw material is drawing attention. The recovery rate of used paper in Japan, which is a major paper consuming country, has shown remarkable growth in recent years with the improvement of pulp recycling technology, and reached 50.5% in 1984. In the general recycling process of used paper, recovered paper is first disintegrated in water using a disintegrator to make it into a single fiber, and then various foreign substances such as metal, plastics and hard-to-disintegrate paper used for bookbinding. The printing ink in the deinking process,
It is a recycled pulp.

On the other hand, as a container used for selling various foods, a container made of a foaming plastic material is predominant. The container is lightweight and easy to mold, is suitable for mass production at low cost, has water resistance and oil resistance, and since it also has heat retention, it is widely used as a food container including trays. However, most of them are single-use and are disposed of in large quantities, and pollution is caused by securing a disposal site and discharging harmful substances during incineration, which is becoming a problem. Further, in addition to the above-mentioned container using the expandable plastic material, a paper container for storing food is also common. This paper container is water resistant,
In order to impart oil resistance, the surface of the base paper is made of PP, PE
T, aluminum, glassine, etc. are adhered by laminating, and substances such as PP, PET etc. adhered by heat welding etc. by such laminating are separated from the base paper by the above-mentioned recycling process of used paper. This is not easy, and there is a drawback that it cannot be used as a raw material for recycled pulp because it cannot be made into a single fiber as a disaggregation device. Therefore, like the foamed plastic container, it is discarded and incinerated after use, and it does not meet the recent need to repeatedly use paper material as recycled pulp, and it still requires a large amount of pulp wood. In addition, there was also a problem that the laminated part could not be bonded using emulsion type glue during the box making process of the paper container such as folding and starting from the development blank. .

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. It uses a paper material without using a foaming plastic material, and has water resistance, oil resistance, and workability. Excellent and, after use as a container body, it is possible to recycle waste paper, and also has heat retention comparable to a container using a foamable plastic material, especially when the whole container is heated by a microwave oven, the internal food The present invention provides a paper container capable of recycling used paper, which allows heat to be evenly distributed to the core of the paper and enables heating and cooking in a short time.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a paper container capable of recycling used paper for achieving the above-mentioned object, and includes alumina , titanium , silica, sodium metaphosphate, and synthetic polycarboxylic acid. A binder is formed by mixing all of the binder agents consisting of sodium acid salt, casein, ammonia, polyacrylamide, and PVA to form a coating, and the coating is applied to the surface of the developing blank of the paper container, and then a varnish is applied over the application site. It is characterized in that it is formed by drying, drying, and appropriately bending and pasting. Among the above binder agents, the product name sodium hexametaphosphate is used for sodium metaphosphate, the product name Aron T-40 is used for the synthetic polycarboxylic acid sodium salt, and the product names Hamacoat and Polyacron are used for polyacrylamide.

[0006]

The present invention is constructed as described above, and alumina and the like are mixed with a binder agent on the surface of the developing blank of the container body, especially on the surface of the container which directly or indirectly contacts the food to be stored. The produced adherend and varnish are applied in a laminated state. Among them, alumina, titanium, and silica radiate far infrared rays by receiving heat from the food itself to be stored or receiving heat from the outside, thereby keeping temperature of the food, keeping freshness, permeation of heat into the food, etc. To be achieved. Among the binder agents, sodium metaphosphate and sodium salt of synthetic polycarboxylic acid serve as dispersants and viscosity modifiers, casein (protein present in milk and beans) serves as a coagulant, and ammonia serves as a solvent, and afterwards natural PVA (polyvinyl alcohol) serves as an adhesive and a sizing agent, and polyacrylamide (CH ₂ ═CH CONH ₂ ) serves as an adhesive and a paper strengthening agent without evaporating and remaining in the binder. In addition, the varnish imparts water resistance and oil resistance.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a blank in which a paper container according to the present invention is developed, and FIG. 2 is a sectional view thereof. As the constituents of the paper body, pulp material (cellulose), zund sulfate (Al ₂ (SO ₄ ) ₃ ), and longines size (pine tar) are used, and as shown in FIG. 1, the development blank (1) is punched out. To form. Next, alumina, titanium, silica, and a coating agent (2) are prepared by mixing sodium metaphosphate, sodium salt of synthetic polycarboxylic acid, casein, ammonia, polyacrylamide, an antifoaming agent, and a binder agent composed of PVA. It is produced and applied to the surface of the development blank (1) with a coating machine such as an air doctor coater, a gravure roll coater, a rod coater, and a plate coater. The blending ratio of various binder agents is not constant, but in the case of this example, in the weight ratio,
Sodium metaphosphate 0.5%, synthetic polycarboxylic acid sodium salt 0.5%, casein 7%, ammonia to casein 15%, polyacrylamide 1
The content is 5.2%, the defoaming agent is 1%, and the others are PVA.
Alumina, titanium, and silica are appropriately mixed in the amount of 10 to 20% of the above binder agent, but they are not uniform and may be increased or decreased depending on the application. After applying the binder agent, a thin varnish (3) is further applied on the upper surface thereof. Then, after being appropriately dried, a predetermined portion is bent by an automatic box making machine and bonded with an emulsion type glue or the like, and then a side plate is raised to make a paper container. Na
In the examples, a defoaming agent was added to produce a binder agent.
However, the defoaming agent may be added as necessary, and the defoaming agent must be used.
It is not necessary to add agents.

Explaining an example of use of the present invention, food stored in a container is cooked in a microwave oven together with the container. In this case, alumina mixed with various binder agents,
As the temperature of the food stored in titanium and silica rises, it begins to emit far infrared rays, and the food is uniformly overheated in a short time. The experiment based on this use example is shown below. A thermal video system and an optical fiber thermometer were used as temperature measuring devices, and a turntable basic type microwave oven was used as heating devices. As the paper container, the one according to the present invention and the one not coated with the coating such as alumina as in the present invention on the inner surface of the container are used, and one Chinese manju serving as a food is housed in each of them and the heating condition is uniform. In order to do so, they were placed on the turntable of the same microwave oven and heated at the same time. Under the experimental conditions, heating was continuously performed for 3 minutes, and changes in temperature of the inside and the skin portion were observed. As a result, the temperature rise inside the food stored in the paper container according to the present invention is higher than the temperature rise of the food stored in another container compared to this, the temperature of the outer skin and the center of the food. It was found that the difference was small and the heating was uniform. In addition, the present invention can be used without any problem in terms of food hygiene, and it is compliant with food hygiene standards regarding heat resistance and the presence or absence of adhesion of harmful substances to food. ) 4904 at Japan Medical Association
It is certified as No. 68 (For the test method, Announcement of Food Safety Division, Ministry of Health and Welfare No. 244, May 8, 1946, Ministry of Health and Welfare Notification No. 370 (December 28, 1959)
In accordance with the test method of, also adopted the gas chromatographic analysis method). Further, it was confirmed that the paper container according to the present invention can be recycled, and a recycling test was conducted by Yamakyo Paper Co., Ltd., and it was confirmed that the recycled paper can be recycled without problems.

[0009]

As described above, the recyclable paper container according to the present invention is water resistant without the inner surface being laminated with PP, PET or the like like the conventional food storage paper container. It can be used for its excellent properties and oil resistance, and because it is not laminated, recycled paper can be recycled, which contributes to resource conservation and because it is not laminated. At the time of box making, since it is possible to attach each part with emulsion type glue, there is no limitation on the shape or design of the container body, and the selection range of these can be widened, and container bodies of various shapes can be prepared. Can be provided. Also, since alumina, titanium, and silica are mixed, microwave cooking can be performed uniformly in a short time by radiation of far infrared rays, and at the same time, the temperature and freshness of the stored food can be maintained. Will be things.

[Brief description of drawings]

FIG. 1 is a plan view showing a development blank of a paper container according to the present invention.

FIG. 2 is a partially enlarged sectional view taken along the line AA showing the configuration of the paper container according to the present invention.

[Explanation of symbols]

 1 Development blank 2 Coated matter 3 Varnish

Continuation of front page (56) Reference JP-A-2-151439 (JP, A) JP-A-1-182275 (JP, A) JP-A-1-178208 (JP, A) JP-A-1-153473 (JP , A) JP-A-63-110177 (JP, A) Actually opened 64-53083 (JP, U) Actually opened 64-55818 (JP, U) Actually opened 64-22906 (JP, U) Actually opened 63-54616 (JP, U) Actual Kohei 4-39189 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. Alumina , titanium , silica, sodium metaphosphate, synthetic polycarboxylic acid sodium salt,
A binder is formed by mixing all of the binder agents consisting of casein, ammonia, polyacrylamide, and PVA,
A paper container capable of recycling used paper, which is formed by applying a varnish on the surface of a developing blank of a paper container body, applying a varnish to the applied area, drying the varnish, and appropriately folding, gluing, or the like to make a box.