JPH02180141A - Perishable article wrapping sheet and is wrapping container - Google Patents

Abstract

PURPOSE:To provide a wrapping means satisfactorily effective in maintaining the freshness of a perishable article by laminating waterproof synthetic resin film air-permeable and vapor-impermeable on a layer of the paper containing an adsorbent for adsorbing ethylene gas and a far infrared radiation agent for radiating far infrared rays at normal temperature and pressure. CONSTITUTION:Waterproof film 4 is laminated on a paper layer 3. The paper layer 3 consists of the paper containing ethylene adsorbent 5 and far infrared radiation agent 6. Christobalite clay and monmorillonite clay, etc. are used in the ethylene adsorbent 5. The ceramic is used in the far infrared radiation agent 6 which is manufactured by first giving shape to a mixture of the quartz porphyry containing rare earth elements or ceramic material with manganese zirconium or rare earth elements and then baking the resulting formation at a high temperature. The paper layer 3 consists mainly of the pulp large in water absorption amount and easily desorbed, preferably ground pulp or broadleaf tree soda pulp. The synthetic resin film which is air-permeable or at least oxygen-permeable but vapor-impermeable such as polyethylene, vinyl chloride and vinylidene chloride is used in the waterproof film 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a packaging sheet and a packaging container used for packaging fresh foods, cut flowers, and other living plants.

[Conventional technology] 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 fresh produce. 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 significantly within the bag or box.

[Problems to be Solved by the Invention] Therefore, the present inventor has developed a solution for perishable products such as packaged perishable foods. Y
The present invention was achieved through good results in research on temperature retention.

That is, an object of the present invention is to provide a sheet for packaging perishables and a packaging container for packaging perishables, which are convenient for maintaining the freshness of packaged perishables such as perishables.

[Means for Solving the Problems] The first means for achieving the above-mentioned purpose is a packaging sheet for sealingly packaging perishables in which a waterproof film is laminated on a paper layer. The paper layer has a pulp material that absorbs a large amount of water and easily releases the absorbed water, and contains an ethylene adsorbent that adsorbs ethylene gas and a far-infrared radiator that emits far-infrared rays at normal temperature and pressure. The waterproof film is a perishable product packaging sheet made of a synthetic resin film that is air permeable and water vapor permeable.

The sheet for packaging perishables is large enough to wrap perishables, with the waterproof film on the outside and the perishables wrapped on the paper layer side, then rolled or folded and secured using an appropriate fastening means. It is considered to be sealed.

The means of the second invention is a packaging container for sealingly packaging perishables, which is formed into a predetermined container shape by a sheet material having a paper layer laminated with a waterproof film, wherein the paper layer of the sheet material absorbs moisture. The waterproof film is made of a paper material containing an ethylene adsorbent that adsorbs ethylene gas and a far-infrared ray emitting agent that emits far-infrared rays at normal temperature and normal pressure, in a pulp material that has a large amount of absorbed water and is easily released. The packaging container for perishable products is made of a synthetic resin film that is air permeable and water vapor impermeable, and the paper Fi layer is arranged on the inner surface of the container.

The packaging container has a shape with a lid, such as a bag, a cylinder, or a box, and is sealed by an appropriate fastening means such as pasting with tape.

The packaging contains perishables and is sealed. The fresh products include fresh foods, fresh plants, and the like.

As the ethylene adsorbent according to each invention, a substance that adsorbs ethylene gas, such as cristobalite clay or montmorinite clay, is used. Note that the ethylene adsorbent is mainly applied in the form of powder, particularly fine powder.

Both cristobalite and zeolite that adsorb ethylene gas are silica (St, 2) and alumina (A!203)
It is a porous substance whose main component is pore size of 30 to 7.
It has a large number of 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 40rrt/9. Pore range 15-300
Man.

Pore volume: 300 aw/g, average pore diameter: 110 people.

The adsorption capacity when ethylene was diluted with nitrogen gas at 20°C, relative humidity 90%, and adsorption time (148 hours) was as shown in graph I in Figure 1. It is highly capable.

Table 1 Since the above-mentioned cristobalite is clayey, it can be relatively easily processed into powder, and there is no change in adsorption properties even after processing, and there is no problem of harmfulness in handling. Ethylene is a substance related to the growth hormone of plants, and by removing it from plants, 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, zeolide clay or mineral powder is preferable.

The far-infrared emitting agent according to the present invention is, for example, 2 to 30μ
Natural rock powder (especially fine powder) that emits electromagnetic waves of m
Alternatively, substances that emit far-infrared rays, such as artificial ceramic powder (especially fine powder), which have the same effect as this, can be used. 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 28 wavelengths 7/(27
It is distributed over a range of 2 to 30 μm with a peak energy of 3+T) μm. That is, the xa of quartz porphyry containing rare earths
The diffraction 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 (1) of ceramics containing rare earth elements has characteristics extremely close to the far-infrared energy distribution (Iv) 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 M state of water inside the substance. This electromagnetic wave is caused by the bending vibration of water molecules, the lattice 0-1-
1. To cause stretching vibrations, water is excited and binds strongly to the substance. This makes it difficult for water to evaporate and increases water retention.

Naturally, the action of this electromagnetic wave increases the water retention of perishables.

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

The pulp forming the paper layer is mainly a pulp that absorbs a large amount of water and easily removes the absorbed water. For example, ground wood pulp or four-leaf soda pulp is suitable. In addition, for groundwood pulp and IFJl confectionery soda pulp (!a), plants such as stratification i! 171 can be added in small amounts. Normally, the pulp of widely used paper materials is softwood pulp, and since softwood pulp has a small amount of water absorption and poor absorption and water release properties, it is not preferable to use softwood pulp as the main material. Note that cardboard is made of softwood pulp and is treated with resin to increase its mechanical strength, so it does not absorb water well. Ordinary blotting paper is treated with chemicals to improve its water absorbency, and has a high water absorption capacity, but the 111t theory of absorbed water is not good.

According to the sound test of the present invention, (^) a paper sheet of 100Cd (ffl
ffi 0.25 g> C, (B) When a water absorption test was carried out by holding water in saturated steam at 40°C for 48 hours with a paper sheet made only of tfW and Juharu L, the paper sheet (
As shown in Table 2, A) had a high water absorption capacity.

Further, when the paper sheets (A) and (8) were placed in an atmosphere of low humidity (low water vapor pressure), the paper sheets (8) were (8)
), it was observed that the amount of water absorbed and released was extremely high. For this reason, the paper sheet (A) is used for packing perishable products.
This material is convenient for adjusting the amount of internal water vapor according to external temperature changes in the l'I atmosphere.

The paper layer containing the ethylene adsorbent and the far-infrared ray emitting agent is either mixed with the first half of the paper in the raw material blending process of paper manufacturing, or
Alternatively, it may be formed by attaching the two halves to the surface using an appropriate means in the paper forming process. The amount of ethylene adsorbent mixed is its effective m, which in the case of cristobite powder is, for example, 150 kg per 1 ton of paper material. The amount of far-infrared radiating agent mixed is its effective m, which is, for example, 150 kg per i ton of paper material in the case of rare earth-containing ceramic powder.

As the waterproof film, a synthetic resin film such as polyethylene, vinyl chloride, vinylidene chloride, etc., which is permeable to air, at least permeable to oxygen, and impermeable to water vapor, is used. In addition,
According to the first invention and the second invention, v! ! Perishable products in closed packaging are used for storage or transportation.

[Function] In the packaging sheet of the first invention and the packaging container of the second invention, the ethylene gas of the 17 QE items packaged is adsorbed by the ethylene gas adsorbent, and the far-infrared radiating agent retains water in the perishable product itself. Ru. Furthermore, the packaging sheet and packaging container allow air, at least oxygen, to pass between the sealed portion and the outside.

The paper 'r1 layer absorbs and retains the condensed water in the sealed area, and maintains a water vapor partial pressure of M in the sealed area. Furthermore, when the partial pressure of water vapor in the sealed portion decreases, the water absorbed by the paper layer contributes to the partial pressure of water vapor. Water vapor within the packaging container is retained in response to the outside temperature or the amount of perishable product consumed.

[Example] Next, a first example of the present invention will be described with reference to FIGS. 4 to 6.

FIG. 4 shows a packaging sheet 2 for wrapping fresh produce 1, which has appropriate flexibility and rigidity so that it can be bent and skewered. The packaging sheet 2 has a structure in which a waterproof film 4 is laminated on the entire one side of a paper layer 3 (see FIG. 5). The paper layer 3 is made of ground wood pulp, for example, 40fflff.
i part, 50 parts by weight of four-leaf soda pulp, 1,000 parts by weight of softwood pulp, 0.03 parts by weight of acrylic emulsion (adhesive), 8 parts by weight of particles of ethylene adsorbent 5, 12 parts by weight of particles of far-infrared emitting agent 6 The paper is made by mixing weight parts.

A fungicide and a water repellent are mixed into the paper layer 3 as necessary. The ethylene adsorbent 5 of this example uses the above-mentioned fine cristobalite powder, and the far-infrared ray emitting agent 6 of this example uses the above-mentioned quartz porphyry fine powder containing rare earth elements. The waterproof film 4 is made of, for example, a 2 μm thick polyethylene film that is thermally bonded. The paper layer 3 on which the waterproof film 4 is laminated (the total thickness of the waterproof film 4 and the paper layer 3 is about CIam) is impermeable to water vapor (permeation humidity 4 g/rd at 20°C).

24 hr) and oxygen permeability (oxygen permeability at 20°C 3.9 cm 7 m, 24 hr, at
n+).

The packaging sheet 2 is used for packaging fresh flowers 1 such as cut flowers for transportation or storage.

In other words, a predetermined number of fresh cut flowers 1 are arranged on the 3 sides of the paper layer of the packaging sheet 2 of this example, and the packaging sheet 2 is troughed with the 4 sides of the waterproof film facing outward. Wrap the product 1, and fasten both ends of the wrapped packaging sheet 2 with fastening means 8 such as string or adhesive tape, and fasten the outer side of the packaging sheet 2 with adhesive tape (not shown) to seal the inside. It is considered to be a packaged product (see Figure 6). In addition, as a control product A, perishable products 1 were prepared using a packaging sheet in which a waterproof film 4 was laminated on a paper layer 3 made only of softwood pulp, without mixing the ethylene adsorbent 5 and the far-infrared emitting agent 6.
A packaged product was prepared (not shown).

Packaged product A and control product A were opened after being left in a room at a room temperature of 18 to 22°C for 2 days. No decrease in freshness was observed in the cut flowers of fresh product 1 of packaged product A.

Perishable product 1 of control product A lacked freshness and was wilted and spoiled.

Next, a second embodiment will be explained with reference to FIGS. 7 to 9.

FIG. 7 shows a packaging bag 12 for wrapping fresh produce 11. One side of the bag 12 has an opening 13, and the third side is closed and has a predetermined size. In addition, the packaging bag 12 shown in FIG. 7 has adhesive portions 14 on three sides 1'3.

The material of the packaging bag 12 is the same as that of the packaging sheet 2 of the first embodiment described above, and includes an ethylene adsorbent 5 and a far-infrared emitting agent 6.
and ground wood pulp and l! It has a sheet structure in which a waterproof film 4 is laminated to a paper layer 3 mainly made of monofoliated soda pulp, and has appropriate flexibility and rigidity to allow bending. The a cover 12 is formed with the waterproof film 4 on the outside (see Fig. 8).

For example, the packaging bag 12 of this example includes a fresh product 1 such as a fruit.
1 is inserted, the opening 13 is bent, adhesive tape is applied or heat-sealed, and the package is sealed to form a package opening (see FIG. 9).

In addition, as a control product, a paper layer 3 containing only softwood pulp and without mixing the ethylene adsorbent 5 and the far-infrared emitting agent 6 was used.
A fresh product 11 was hermetically packaged in a packaging bag formed from a packaging sheet laminated with a waterproof film 4 (not shown).

The package opening and the control opening were opened after being left in a room at a room temperature of 18 to 22°C for 7 days. Fresh product 11 at the package opening showed a small weight loss, and no decrease in freshness was observed. Fresh product 11 in the control product port lacked freshness and had a large weight loss.

Next, a third embodiment of the present invention will be described with reference to FIGS. 10 to 12.

FIG. 10 shows a bottomed packaging box 22 made of cardboard 25 in which a raw If product 21 is placed, with an opening 23 at the top, and a lid 24 that closes the opening 23 and is bent on each upper side of the opening 23. mounted in a predetermined box shape. As shown in FIG. 11, the cardboard 25 of the packaging box 22 is made of two liner papers 26.27<thickness 1.5. ) A corrugated core paper 28 (thickness 1.5.w) is glued between the
The packaging sheet 2 of the first embodiment is adhered to the entire surface of the liner paper 26 on the inside of the box. That is, the packaging sheet 2 includes a paper layer 3 having an ethylene adsorbent 5 (cristobalite) and a far-infrared emitting agent 6 (rare earth-containing quartz porphyry).
and polyethylene waterproof film 4 (film thickness 2μ
m), and is laminated on the waterproof film 4 with the liner 126 so that the paper layer 3 side faces the meat side. Therefore, in the paper layer 3 inside the box, the ethylene adsorption effect of the ethylene adsorbent 5 and the far-infrared emitting agent 6
tlif)1 action of the far infrared rays caused by the infrared rays, and the action of absorbing condensed water and releasing the absorbed water. The cardboard 25 has water vapor permeability (20℃) in the waterproof film 4.
moisture permeability 4g/TIt, 24hr) and air permeability (oxygen permeability 3.9C13/lr at 20℃)
i, 24hr, atIIl) T al.

Note that the cardboard 25 of the third embodiment is a normal one, and the liner paper 26, 27 and core paper 28 are both made of softwood pulp and treated with resin, and have low water absorption and low air permeability. It has great physical properties.

Thus, perishable products 21 are placed in the packaging box 22 of the third embodiment, each lid body 24 is folded to close the mouth part 23,
Packed with adhesive tape and sealed in a sealed manner, it is considered a packaged product (
(See Figure 12).

In addition, as a control product C, a packaging box of the same shape was used, which was formed by laminating a paper layer containing no ethylene adsorbent 5 and far-infrared emitting agent 6 on the inside of a cardboard box with a waterproof film.
The same fresh produce 21 was placed in this and sealed (not shown)
.

The packaging box C and the control product C were opened after being left in a room at a room temperature of 20° C. for 7 days. For fresh food 21 in packaged products, there was no decrease in the amount of consideration, and no deterioration in freshness was observed.

Fresh product 21 of control product C had a decrease in freshness and a large weight loss.

In this third example, when bananas with skin were packaged as the fresh product 21, the results of packaging for 3 days, 5 days, and 7 days were as shown in the table.

As is clear from Tables 3 and 4, the ethylene concentration in the box of packaged product C of this example is lower than that of control product C, and the banana in packaged product C is lower than that of control product C. There was little change in weight compared to bananas, and water retention was recognized to be good. When examining the appearance of each banana in the packaged product and the control product after 7 days, it was found that the banana in the packaged product had 2 to 3 black spots on its skin, but the skin of the banana in the control product had 2 to 3 black spots. Many black spots were observed.

In addition, in this test, there was no condensation of moisture in packaged product C and control product C, and there was no mold growth.

[Effects of the Invention] According to the first and second inventions, perishable products can be packaged in a hermetically sealed manner to maintain the freshness of the perishable products, which is convenient. That is, in the first and second inventions, ethylene gas generated by fresh products is adsorbed and removed by the ethylene adsorbent in the paper layer, and acceleration of ripening is suppressed, and far infrared rays generated by the far infrared radiating agent in the paper layer are removed. It uses energy to promote water retention in perishables, and uses a waterproof film to absorb and retain water vapor and condensed water inside the container in the paper layer without escaping the container, and releases moisture as necessary to release the water vapor pressure inside the container. Maintain temperature and equilibrium. Air such as oxygen can pass through the waterproof film, and the perishables in the packaging container can be maintained in a fresh condition.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the ethylene adsorption ability of cristravite, 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. 4 to 6 show a first embodiment of the present invention, FIG. 4 is a perspective view of a packaging sheet, FIG. 5 is an enlarged sectional view taken along line v-V in FIG. 4, and FIG. 6 is a packaging sheet. It is a usage pattern diagram of the sheet for use. 7 to 9 show a second embodiment of the present invention, FIG. 7 is a perspective view of the packaging bag, FIG. 8 is an enlarged sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a packaging bag. FIG. Figures 10 to 12 show a third embodiment of the present invention;
Figure 0 is a perspective view of the packaging box, and Figure 11 is Xl-X1l! ;l
12 is an enlarged sectional view at J'3, and FIG. 12 is a diagram showing how the packaging box is used. 1, 11.21... Fresh products 2... Packaging sheet 3... Paper layer 4... Waterproof film 5... Ethylene adsorbent 6... Far-infrared emitting agent 12... Packaging bag 22... Packaging box 25... Cardboard 26, 27... Liner paper 28... Core paper ethylene (1) pm) Figure 1

Claims (2)

[Claims] (1) A packaging sheet with a paper layer laminated with a waterproof film for airtight packaging of perishables, wherein the paper layer is made of pulp that absorbs a large amount of water and easily releases the absorbed water, and ethylene gas is added to the paper layer. The waterproof film is made of a paper material containing an ethylene adsorbent that adsorbs and a far infrared ray emitting agent that emits far infrared rays at normal temperature and normal pressure, and the waterproof film is made of a synthetic resin film that is air permeable and impermeable to water vapor. A fresh product packaging sheet featuring: (2) A packaging container for sealingly packaging perishables formed into a predetermined container shape using a sheet material made of a paper layer laminated with a waterproof film, wherein the paper layer of the sheet material absorbs a large amount of water and absorbs water. The waterproof film is made of a paper material containing an ethylene adsorbent that adsorbs ethylene gas and a far-infrared ray emitting agent that emits far-infrared rays at room temperature and normal pressure in a pulp that is easily released. A packaging container for perishable products, characterized in that the container is made of a film of a poorly permeable synthetic resin and the paper layer is arranged on the inner surface of the container.