JPH02215527A - Packaging sheet material and its manufacture - Google Patents

Abstract

PURPOSE:To keep freshness of perishable goods such as perishable foods, by a method wherein powdery and granular bodies of an ethylene adsorbent and a far infrared ray irradiating agent are dispersed on the surface of a paper material sheet, then those powdery and granular bodies are covered with a synthetic resin film and laminated to the paper material sheet. CONSTITUTION:A mixed powdery body of powdery and granular bodies 4, 5 of an ethylene adsorbent and far infrared ray irradiating agent is prepared and the mixed powdery body is dispersed evenly on the top of a paper material sheet 2 on a rest plate 6 by possessing a gap at the rate, for example, of 4g/m<2>. The top of the spread powdery and granular bodies 4, 5 is covered with the powdery and granular body 4 dispersed by arranging a propylene film 3. Then a heated hot roller 7 is arranged on the film 3, the hot roller 7 is advanced from an end side of the film 3 while pressing toward the other end side and the film 3 is laminated to the paper material sheet 2.

Description

[Detailed Description of the Invention] [Industrial Application Field J] The present invention relates to a packaging sheet material used for packaging fresh foods, mainly fresh plants such as cut flowers, and a method for manufacturing the same. .

[Prior Art] For example, when fresh products such as fruits and vegetables are packaged in bags or boxes, ripening is accelerated by the ethylene gas emitted by the fresh products. This ethylene gas has approximately the same specific gravity as air, so it easily fills bags and boxes, promoting the ripening of perishables. In addition, the moisture content of packaged perishable products changes rapidly within the bag or box.

[Problem I to Solve by the Invention] Accordingly, the present inventor has achieved the present invention by obtaining good results in research on maintaining the freshness of perishable products such as packaged perishable foods.

That is, an object of the present invention is to provide a packaging sheet material that is convenient for maintaining the freshness of packaged fresh foods and other perishable products, and a method of manufacturing the packaging sheet material that is easy to manufacture.

[Means for Solving the Problems] The means of the M1 invention for achieving the above-mentioned object is that a paper sheet is laminated with a synthetic resin film, and the paper sheet and the synthetic resin film are coated with ethylene gas. A packaging sheet material is formed by dispersing and interposing a powder of an ethylene adsorbent that adsorbs and a powder of a far infrared ray emitting agent that emits far infrared rays at room temperature and normal pressure. This packaging material is used, for example, in the form of a sheet or bag, or as a filler for packaging fresh products such as fruits in boxes.

The means of the second invention includes dispersing, on the surface of a paper sheet, granules of an ethylene adsorbent that adsorbs ethylene gas and granules of a far-infrared ray emitting agent that emits far-infrared rays at normal temperature and normal pressure.
After that, these powders are covered with a synthetic resin film,
The method for manufacturing a packaging sheet material includes the step of laminating the synthetic resin film onto a paper sheet.

The fresh products include fresh foods and fresh plants.

The ethylene adsorbent according to each invention uses a substance that adsorbs ethylene gas, such as cristobalite clay or montmorinite clay.

The ethylene adsorbent is applied in powder form. Note that the granular material refers to powder, granules, or a mixture of powder and granules.

Both cristobalite and zeolite that adsorb ethylene gas are silica (Si02) and alumina (A+□03)
It is a porous substance whose main component is
．． It has a large number of 5A pores and has the property of adsorbing ethylene gas generated by plants and ammonia gas generated during decay at room temperature and pressure.

The cristobalite has, for example, a chemical composition shown in Table 1, a particle size range of 0.1 to 20 μm, and an average particle diameter of 7 μm.

Specific surface area 40ffl/g, IB pore range 15-30
0A.

Pore volume: 300 shoes/g, average pore diameter: 170A.

The adsorption capacity when ethylene was diluted with nitrogen gas at 20°C, relative humidity 90%, adsorption time 48 hours is as shown in the graph of Figure 1, and the adsorption capacity of ethylene at high humidity is It has a high value.

Table 1 (The values in the table are weight M%) Since the cristobalite is clayey, it can be relatively easily processed into powder and granules, and there is no change in adsorption properties even after processing, making it easy to handle. There is no problem of toxicity. Ethylene is a substance related to plant growth hormone;
By removing it from fruits, etc., growth can be suppressed and overripening can be prevented. When fresh products are packaged, the inside of the package is filled with ethylene gas, but by removing this gas, overripening can be significantly prevented. Incidentally, when there is a lot of water vapor in the atmosphere inside the package, montmorinite clay or mineral powder is suitable, and when there is little water vapor in the atmosphere inside the package, zeolite clay or mineral powder is preferable.

The far-infrared emitting agent according to the present invention is, for example, 2 to 30μ
Substances that emit far infrared rays are used, such as natural rock powder that emits 21f magnetic waves of m or artificial ceramic powder that has an equivalent effect. Examples of far-infrared minerals used include quartz porphyry containing rare earth elements, or ceramics obtained by blending manganese, zirconium, and rare earth elements with ceramic raw materials, molding the mixture, and firing the mixture at a high temperature.

The far-infrared energy emitted by this far-infrared mineral has a wavelength of 2897/(27
It is distributed over 2 to 30 μm with the energy of 3+T>μm as the peak. That is, the X-ray diffraction of quartz porphyry containing rare earth elements is as shown in the chart shown in FIG. 2, for example. As shown in Figure 3, the far-infrared energy distribution of quartz porphyry ■.

The far-infrared energy distribution (2) of ceramics containing rare earth elements has characteristics extremely close to the far-infrared energy distribution (2) of black body radiation.

In general, electromagnetic waves of 2 to 30 μm have strong permeability into the interior of a substance, and have the effect of changing the suspension state of water inside the substance. This electromagnetic wave causes bending vibrations and lattice 0-H stretching vibrations of water molecules, so water is excited and strongly bonds to substances. This makes it difficult for water to evaporate and increases water retention. In other words, the action of this electromagnetic wave increases the water retention capacity of fresh produce.

This far-infrared mineral can be easily processed into powder and granules, and has not been found to be harmful to the human body.

The paper sheet is preferably a sheet mainly made of vegetable fibers such as pulp, Kozo (1), and stratified fibers.

The synthetic resin film is a thermoplastic film such as polypropylene.

The amount of dispersion of ethylene adsorbent powder A and far infrared ray emitting agent powder B varies depending on the type of ethylene adsorbent and far infrared ray emitting agent, or the use of the packaging sheet. , the particle size of B is approximately 5 to 7 μm, and the specific gravity is 2.6.
Powder A is 1.2 to 2 g/Td, powder B is 1.
．． There are 8 to 39/mr.

[Function] In the packaging sheet material of the first invention, ethylene gas from packaged perishable products is adsorbed by the ethylene gas adsorbent,
In addition, the far-infrared ray emitter retains water in perishables.

In the manufacturing method of the second invention, the powder of the ethylene adsorbent and the powder of the far-infrared ray emitting agent are held between the paper sheet and the synthetic resin film, and each exhibits its function.

The packaging sheet material of the first invention and the packaging sheet material obtained by the second method are used for packaging perishable products or as fillers for protecting perishable products during container packaging.

Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 9.

FIG. 4 shows the packaging sheet material 1 of this example, and FIG. 5 shows an enlarged sectional view thereof. The packaging sheet material 1 of this example is made of a foldable and foldable sheet. This packaging sheet material 1 includes, for example, a paper sheet 2 (9 to 10 μm thick) laminated with a polypropylene film 3 having a thickness of 2 to 3 μm, and an ethylene adsorbent is added between the paper sheet 1 and the film 3. It has a structure in which granular materials 4 to 4 and granular materials 5 to 5 of far infrared ray emitting agent are dispersed and interposed.

The particle size of the ethylene adsorbent particles 4 to 4 is 5 to 7 μm,
A fine powder of cristobalite with a specific gravity of 2.6 is used. The fine powders 5 to 5 of the far-infrared emitting agent have a particle size of 5 to 7.
A fine powder of quartz porphyry with a specific gravity of 2.6 μm is used. The meat powder particles 4 and 5 are mixed in advance at an ff1ftt ratio of 2:3, and the mixed powder is uniformly distributed over the entire upper surface of the paper sheet 2 with gaps at a rate of 4 g/yd.

The film 3 is adhered to the paper sheet 2 in the gap between the mixed powders. By laminating the film 3, the meat powder particles 4-4, 5-5 are fixed to two sides of the paper sheet.

The packaging sheet material 1 of this example is easily manufactured, for example, by the following process. First, a mixed powder of ethylene adsorbent powder 4 to 4 and far infrared ray emitting agent powder 5 to 5 is prepared, and as shown in FIG. Next, the mixed powder is uniformly dispersed with gaps, for example, at a ratio of 49/i.

Next, a polypropylene film 3 having approximately the same size as the paper sheet 2 and a thickness of 2 to 3 μm is placed on the dispersed powder 4.5 to cover the dispersed powder 4.4,
After that, a heated O-rough heated to about 80 to 95°C is placed on the film 3, and the heat roller 7 is advanced while pressing from one end of the film 3 to the other end, and the film 3 is rolled into a paper sheet. Laminate on both sides. Film 3 is powder material 4
It is separately attached to the paper sheet in the part where ゜5 does not exist.

In this way, the packaging sheet material 1 described above is formed.

The obtained packaging sheet material 1 has a structure in which ethylene adsorbent powders 4 to 4 and far infrared ray emitting agent powders 5 to 5 are fixed to a film, and is suitable for use in fresh foods. used as wrapping paper.

The packaging sheet material 1 of this example is cut into a predetermined size, and the fruit is placed on the opposite side of the laminated film 3.

It is used for packaging fresh foods such as vegetables, fish, and cut flowers.

In this example, a packaging bag (2) is made using the packaging sheet material 1 with the film 3 on the outside, and the same amount of pudding, spinach, and cabbage (1/8 cut) of the same freshness are placed in this bag. , four types of celery (cut) were placed in the container, and the opening was bent and glued to seal. This packaging bag (2) was placed in a cardboard box, the lid was screwed on, and the bag was left standing in a room at 20 to 23°C to observe oral changes. As a comparison, a packaging sheet material (not shown) consisting only of the paper sheet 2 and the laminated film 3, in which the meat powder particles 4 to 4.5 to 5 are not interposed between the paper sheet 2 and the film 3, was used. A packaging bag Vt in which the vegetables were packaged was prepared and similarly placed in a cardboard box to observe changes over time. Changes over time in each packaging bag (■) and (■) were examined by visual observation of the state of the vegetables. The results were as shown in Table 2.

Table 2 (Continued on next page) As is clear from Table 2, vegetables in packaging bag ■ are in packaging bag V.
It was observed that the vegetables were kept fresh for a longer period of time than the other vegetables.

Also, put two bananas with skin in the packaging bags ■ and ■,
Packaging bag (2) is subjected to aging control (room temperature is 20 to 22°C) in the same manner as the above-mentioned packaging bags.

Changes in weight, ethylene concentration, and oxygen concentration of each banana in (2) were investigated. The result of weight change is the amount of weight loss.
The results of changes in ethylene concentration and oxygen concentration are shown in Table 4.

Table 3 Table 4 (Continued on next page.) be.

As is clear from Tables 3 and 4, the ethylene concentration in the packaging bag Vl is lower than that in the packaging bag ■, and the weight of the bananas in the packaging bag ■ changes compared to the bananas in the packaging bag ■. It was recognized that the water retention capacity was good.

When examining the appearance of each banana in packaging bags ■ and ■ after 7 days, it was found that bananas in packaging bag Vl had 2 to 2 black spots on the epidermis.
However, many black spots were observed on the epidermis of the banana in packaging bag ■. In addition, in this test, there was no condensation of moisture in each packaging bag, and no mold was generated.

In addition, the packaging sheet material 1 of this example is cut into a predetermined size so that the film 3 is on the inside.
It is crushed to form a filling material (not shown) for packaging of an appropriate size. This packaging filler is perfect for packaging fruits, etc.! Fruits as wood mutual darkness gap,
It fills the gap between the fruit and the container. The fillers used in the container are ethylene adsorbent powder 4 to 4 and far infrared ray emitting agent powder 5 to 5, which act in the container. Since the filler contains an ethylene adsorbent and a far-infrared ray emitting agent, trace amounts of ethylene gas generated by fruits are adsorbed and removed by the ethylene adsorbent, and moisture in the fruit is removed by the far-infrared action emitted by the far-infrared radiant. is maintained, and the freshness of the packed fruit is maintained.

The packaging sheet material 1 of the above-mentioned embodiment has a mixed powder of 4.5 degrees of powder particles dispersed over the entire upper surface of the paper sheet.
, 5 may be obtained by arranging a predetermined m of mixed powder of granular material 4.5 at regular intervals as in the packaging sheet material 11 shown in FIG. 8, or in the packaging shown in FIG. 9. For example, in a form in which rows of granular materials 4 and rows of granular materials 5 are arranged alternately as in the sheet material 21, the granular materials 4 and 5 act evenly on the packaged perishable products. It can take any suitable form.

[Effect of the Invention 1 The first invention is a packaging sheet material in which granular ethylene adsorbent and granular far-infrared ray emitting agent are covered and held by a laminate of synthetic resin film, so it is suitable for packaging perishable products. When used as a filler to protect perishable products during packaging and packaging, the generated ethylene gas is adsorbed and removed, suppressing the stagnation of ripening of perishable products, and the far-infrared energy generated by the far-infrared emitting agent is This promotes water retention and keeps perishables fresh.

The manufacturing method of the second invention is to disperse ethylene adsorbent powder and far-infrared radiation emitting agent powder on the surface of a paper sheet, cover these powders with a synthetic resin film, and then cover the powder with a synthetic resin film. Since the powder is laminated on the paper sheet, the powder and granules are held on the surface of the paper sheet, and the packaging sheet having the structure of the first invention can be easily produced.

[Brief explanation of the drawing]

FIG. 1 is a graph showing cristravite as an ethylene adsorbent, FIG. 2 is an X-ray diffraction chart of quartz porphyry, and FIG. 3 is a far-infrared energy distribution map of rare earth-containing quartz porphyry. Fig. 4 is a broken perspective view of the packaging sheet material, Fig. 5 is an enlarged sectional view taken along line v-v in Fig. 4, Figs. 6 and 7 are manufacturing process diagrams of the packaging sheet material, and Fig. 8 and FIG. 9 are separate structural diagrams of the packaging sheet material. 1.11.21 Packaging sheet material 2 Paper sheet 3 Film 4.5 Powder 7 Heat roller

Claims (2)

[Claims] (1) A paper sheet is laminated with a synthetic resin film, and between the paper sheet and the synthetic resin film is a powder of an ethylene adsorbent that adsorbs ethylene gas;
A packaging sheet material comprising dispersed particles of a far-infrared radiating agent that emits far-infrared rays at normal temperature and pressure. (2) On the paper sheet surface, disperse granules of an ethylene adsorbent that adsorbs ethylene gas and granules of a far-infrared ray emitting agent that emits far-infrared rays at normal temperature and normal pressure, and then disperse these granules. 1. A method for producing a packaging sheet material, comprising: covering the material with a synthetic resin film, and laminating the synthetic resin film onto a paper sheet.