JPH02300399A - Far infrared ray radiating paper - Google Patents

Abstract

PURPOSE:To obtain the title paper having freshness maintaining action, food flavor improving action, warming action, etc., by uniformly blending fibers containing ceramic fibers and pulp fibers in a specific ratio and making the blend into paper. CONSTITUTION:20-40wt.% ceramic fibers prepared by reacting a raw material component containing ceramics in the presence of platinum and/or iron and 8-60wt.% pulp fibers (preferably 2-3D fineness and 2-3mm fiber length) are uniformly blended and made into paper to give the aimed paper.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a far-infrared emitting paper, and more particularly to a far-infrared emitting paper that maintains freshness, has an effect of improving the taste of foods, a heating effect, etc.

<Prior art> Conventionally, it has not been clarified what kind of effects can be obtained by emitting far infrared rays, and only some effects have been observed empirically. However, in recent years, With the development of analytical instruments and the like, it is becoming clear that, for example, radiating far infrared rays can maintain the freshness of foodstuffs and improve their flavor. Specifically, when the structure of water molecules in foods that emit far-infrared rays is analyzed by nuclear magnetic resonance spectroscopy, it has been revealed that the population of water molecules becomes small enough to stimulate taste bud cells. That is, by emitting far-infrared rays, it is possible to activate the vibrations of water molecules, which is thought to prevent cell destruction and improve flavor.

Recently, ceramics have been mentioned as "R-functional materials that emit far-infrared rays," and various products that emit far-infrared rays using such ceramics have been proposed. Specifically, for example, Japanese Unexamined Patent Publication No. 158156/1983 discloses a ceramic sheet made by forming a solution of a mixture of ceramic powder and silica powder into a sheet shape and drying the solution. Furthermore, as packaging materials for maintaining the freshness of fresh foods, for example, freshness maintenance tapes using ceramic fibers, sheets made of polyester nonwoven fabric treated with a thin ceramic film, and nonwoven fabrics made by mixing fine ceramic powder and thermoplastic resin. Sheets etc. that are printed on are proposed.

However, sheets and the like containing the ceramics require processing in order to package various types of fresh foods and flowers of different shapes and sizes.

Furthermore, in order to increase the emissivity of far-infrared rays, it is necessary to increase the content of ceramics, which results in drawbacks such as difficulty in deformation.

In addition, each sheet used as the packaging material has a ceramic component attached to its surface by laminating or printing, and the paper itself has far-infrared radiation, and it is suitable for use with shoji screens of buildings, etc. The reality is that there is no known paper that has the smoothness, whiteness, and strength that can be used for paper, wallpaper, etc.

<Problems to be Solved by the Invention> The purpose of the present invention is to provide far-infrared radiation that has an extremely high far-infrared emissivity at room temperature and has the effect of maintaining the freshness of fresh foods, drinks, fresh flowers, etc., and improving the taste of foods. The purpose is to provide paper.

Another object of the present invention is to provide a far-infrared emitting paper that is suitable for shoji paper or wallpaper in buildings and has a heat-retaining effect.

Yet another object of the present invention is to provide a far-infrared emitting paper that can be extremely easily processed into any shape and size.

According to the present invention, 20 to 40% by weight of ceramic fibers obtained by reacting raw material components containing ceramics in the presence of platinum and/or iron, and 80 to 60% by weight of pulp fibers. % by weight, and is made by uniformly mixing and paper-making fibers containing the ceramic fibers and pulp fibers.

The present invention will be explained in more detail below.

The far-infrared emitting paper of the present invention is characterized in that it contains a specific amount of specific ceramic fibers and pulp fibers, and each fiber is uniformly intertwined.

The ceramic fiber used in the present invention is a component that efficiently emits far-infrared rays at room temperature, and is obtained by reacting raw materials containing ceramic fiber in the presence of platinum and/or iron. Contained as a constituent. The ceramic may be any ceramic that normally emits far infrared rays, and is preferably selected from the group consisting of, for example, sintered alumina, silica, zirconia, titania, and mixtures thereof. In particular, the silica is silicon. Examples include silicates, silicic acid, silicon dioxide, etc., and silica in any form of crystalline + m-shaped, glassy or colloidal can be used. Further, as the platinum and/or iron used as the catalyst, publicly known platinum and/or iron can be used, and platinum colloids obtained by known methods such as the Predig method are particularly preferred.

The blending ratio of the ceramics and platinum and/or iron is
99-99.95% by weight of ceramics.

0.05 to 1% by weight of white metal and/or iron, particularly preferably 20 to 55% by weight of silica-free ceramics. 30-45% by weight of i1, 44-79% by weight of silica, especially 52-68% by weight of platinum and/or iron.
The range of 0.05 to 1% by weight, particularly 0.1 to 0.4% by weight is preferable. Outside the above blending range, far infrared rays are not efficiently emitted at room temperature, which is not preferable. Moreover, as the ceramic fiber component, silicon nitride can be contained in a range of 0 to 2.3 parts by weight based on 100 parts by weight of the ceramic fiber material.

The fiber degree of the ceramic fiber containing each of the above components is 2 to 2.
The fiber length is preferably 5D, particularly preferably in the range of 4 to 4.5D, and the fiber length is preferably 1 to 7 m, especially 3
It is desirable that the fiber density and fiber length be in the range of ~55wm; in this case, if the fiber degree and fiber length are outside the above ranges, it is not preferable because it takes a long time to mix the paper with pulp fibers and it is difficult to uniformly mix and paper.

In the present invention, the above-mentioned ceramic fiber! liI! For example, a known or commercially available long-chain synthetic polymer compound having an amide bond, the ceramic material, and platinum and/or iron are melted in an electric furnace or the like at a high temperature, preferably 2000°C or higher, to form a fiber. It can be obtained by converting It is also possible to add a-acid glass, chromium oxide, etc. to the ceramic material. Also, to form fibers, blowing a stream of compressed air or steam onto the trickle of the melt;
It can be made into fibers by a method such as melt splitting and drawing.

Pulp fibers used in the present invention include wood pulp, waste paper pulp, synthetic pulp, etc. Specifically, wood fibers such as softwood and hardwood; seed fibers such as cotton and kapok; , n, bark application, bast fibers such as mulberry, jute, flax, hemp, potato hemp, ramie, leaf fibers such as manila hemp, sisal hemp; strength fibers such as rice straw, rice husk, bamboo, bagasse, esparto, etc. The fiber degree of the pulp fiber is preferably 2 to 4.5D, particularly preferably 2 to 3D, and the fiber length is preferably 2 to 7cm, particularly 2 to 3cm. If the desired fiber density and fiber length are outside the above ranges, it will take a long time to mix the fibers with ceramic fibers.

Further, it is difficult to uniformly mix the paper, which is not preferable.

In the present invention, the content ratio of the ceramic fibers and pulp fibers is 20 to 40% by weight of the ceramic fibers.
, pulp fiber ranges from 80 to 60% by weight. In this case, if the ceramic fiber content is less than 20% by weight, that is, if the pulp fiber content is more than 80% by weight, far infrared rays will not be efficiently emitted at room temperature.

In addition, when the ceramic fiber content exceeds 40% by weight, that is, when the pulp fiber content is less than 60% by weight, the amount of ceramic fiber is too large and the smoothness, whiteness, etc. of the paper itself cannot be obtained.
There is a possibility that it cannot be used for shoji screens or wallpaper in buildings.

The far-infrared radiation paper of the present invention preferably has a thickness of 0.1 to 0.13 mm and a basis weight of 25 to 35 g/I.

If the thickness and basis weight are outside the above ranges, the paper itself will lose its smoothness, making it difficult to use as packaging material or shoji paper.

In order to produce the far-infrared emitting paper of the present invention, it is important to uniformly mix the ceramic fibers and pulp fibers. Each fiber can be uniformly mixed by a method such as dispersing the fibers and pulp fibers separately using a stirrer such as a bocher, refining the pulp fibers, and mixing them with the dispersed ceramic fibers. . At this time, it is preferable to add a fiber binder agent such as polyvinyl alcohol type or soluble vinylon fiber in an amount of about 8 to 12% by weight based on the total weight of the fibers. The paper can be made by adjusting the paper stock concentration to about 0.1 to 0.5% by weight, and performing dehydration, paper waste formation, and drying using a paper machine such as a known cylinder paper machine. It is preferable that the stirring during mixing and paper-making of each of the above-mentioned fibers is carried out under gentle conditions to the extent that one paper raw material does not foam. In addition, if the content of ceramic fibers is high, the dehydration of the wet paper is very good, which may cause sagging during the drying process. It is preferable to add a sizing agent, etc., also in the drying section.

It is necessary to dry below the melting point of the ceramic fibers so that the ceramic fibers do not melt.

In the present invention, in order to improve the smoothness, whiteness, strength, etc. of the far-infrared emitting paper, it is also possible to add known fillers, aggregating agents, etc., and further known antifoaming agents, dryer release agents, etc. can also be added.

<Effects of the Invention> The far-infrared emitting paper of the present invention efficiently emits far-infrared rays at room temperature, so it can be used for fresh foods and drinks.

It maintains the freshness of fresh flowers and improves the taste of foods.
Moreover, it can be processed extremely easily into any shape and size, and furthermore, it has a heat-retaining effect. Therefore, it is extremely useful as a packaging material for fresh foods, drinks, fresh flowers, etc., and as shoji paper or wallpaper for buildings, etc.

<Examples> The present invention will be explained in more detail below with reference to Examples and Test Examples, but the present invention is not limited thereto.

D1L 45 parts by weight of sintered alumina, 52.3 parts by weight of silica, 0.4 parts by weight of platinum and 2.3 parts by weight of silicon nitride were put into a masterbatch, melted at 2000°C, and then
After obtaining ceramic fibers with a fiber density of 4D using a spinning machine,
The ceramic fiber was cut into 41 pieces. Next, 30 parts by weight of the obtained ceramic fibers were mixed and dispersed in a bocher with water so that the ceramic fibers had a concentration of 1% by weight. In another borcher, water and 70 parts by weight of NBKP fibers were added so that the pulp concentration was 3% by weight, mixed and dispersed, and then subjected to a refiner treatment. 10
% by weight polyvinyl alcohol fibers were put into a bocher and mixed uniformly to prepare a paper stock having a paper stock concentration of 2.5% by weight.Next, 0% Emulsion J sizing agent was added to the paper stock as a sizing agent. After adding .3jl parts, the paper stock concentration was adjusted to 0.15% by weight, and dewatering, paper layer formation and drying were performed using a cylinder paper machine (Kawanoe Zoki Co., Ltd. H) to a thickness of 0.1. ~0.13m.

Paper with a basis weight of 25 to 35 g/rrr was produced. When the emissivity of the obtained paper was measured using a spectrometer at 32° C., far-infrared radiation with a wavelength of 6 to 10 μm was observed.

The results are shown in FIG.

60 W incandescent light bulbs were irradiated onto the far infrared emitting paper obtained in Example 1 at 30 call intervals, and temperature changes were measured using a temperature sensor. The results are shown in Figure 2 as a temperature change graph over the course of one hour.As a comparative test, a similar test was conducted using Japanese paper instead of the far-infrared emitting paper obtained in Example 1. Ta. The results are shown in FIG.

From the results shown in FIG. 2, it was found that the far-infrared emitting paper of the present invention has an excellent thermal effect.

After covering the upper opening of the cup containing the K-Sen goza water for 24 hours with the far-infrared emitting paper obtained in Example 1, the nuclear magnetic resonance spectrum of the water was measured. The results are shown in FIG. As a comparative test, nuclear magnetic resonance spectra were similarly measured for water that was not treated with far-infrared radiation paper.

The results are shown in FIG.

From the results shown in FIG. 3, it was found that the vibration of water molecules was activated by treatment using the far-infrared emitting paper of the present invention.

15 pieces of beef (for sirloin steak) weighing approximately 150g,
Wrapped with far infrared radiation paper produced in Example 1,
It was stored at ℃. The preserved beef was examined for umami, color, color, volatile base nitrogen, and general bacterial count for 51 to 5 days. Delicious taste.

Color and condition were measured by three panelists.

The results were evaluated on a scale of -1 to +13 (zero indicates no change), and the results are shown in Table 1.As a comparative test, a similar test was conducted except that polyethylene was used instead of far-infrared emitting paper. Ta. The results are shown in Table 1.

From the results in Table 1, in the comparative test using polyethylene,
The flavor of the meat disappeared from the second day, and an unpleasant odor was felt from the third day. On the other hand, when the far-infrared emitting paper of the present invention was used, almost no change in freshness was observed until the 5th day, and a freshness maintaining effect was observed.

The test was conducted in the same manner as in Test Example 3, except that 70 g of salmon fillet was used instead of the trial Goto beef. From the results shown in Table 2, it was confirmed that the far-infrared emitting paper of the present invention had the same freshness maintaining effect as Test Example 3.

[Brief explanation of drawings]

FIG. 1 is a chart showing the relationship between the emissivity and wavelength of the far-infrared emitting paper manufactured in Example 1 of the present invention, and FIG. 2 is a chart showing the relationship between temperature and time in comparison with Japanese paper.
FIG. 3 is a chart showing nuclear magnetic resonance spectra of water treated with the far-infrared emitting paper produced in Example 1 and untreated water.

Claims (1)

[Claims] Ceramic fibers 20 to 40 obtained by reacting raw material components containing ceramics in the presence of platinum and/or iron
% by weight and 80 to 60% by weight of pulp fibers, and is produced by uniformly mixing and paper-making fibers containing the ceramic fibers and pulp fibers.