JP2021062874A - Packaging film for condensation water attachment - Google Patents

Abstract

To provide a packaging film which allows dealing of food and prearrangement before cooking to be performed more easily when the packaging film is used for food preservation, while satisfying the purpose of the packaging film of preventing garbage such as dust and germs from attaching.SOLUTION: A packaging film for condensation water attachment is used for attaching condensation water on the surface of an object to be packaged when packaging the object to be packaged. In the packaging film for condensation water attachment, moisture vapor permeability under the condition of 40°C, 90%RH of the packaging film is 400 g/m2 24 hr.SELECTED DRAWING: None

Description

The present invention relates to a packaging film for adhering dew condensation water, which is used for adhering dew condensation water to the surface of the object to be packaged when the object to be packaged is packaged.

Today, wrapping films for wrapping (hereinafter, also referred to as wrapping films) are widely used in homes, restaurants, etc. for sealing foods. This mainly prevents dust, dust and other debris and germs from adhering to the food, and also causes the food to dry and its flavor to deteriorate during storage or processing of the food such as heating and cooling. The purpose is to prevent the odor from diffusing.

From the above-mentioned purpose of use of the packaging film, the packaging film is required to have properties that contribute to the purpose of use of the packaging film, such as oxygen gas barrier property, water vapor barrier property, and heat resistance.
In particular, focusing on the water vapor barrier property, a packaging film containing a polyvinylidene chloride resin (Patent Document 1) has been proposed for the purpose of obtaining a packaging film having a high water vapor barrier property.

JP-A-2019-151018

Conventionally, as shown in Patent Document 1, development has been carried out focusing on enhancing the water vapor barrier property.
By the way, the packaging film is also used for storing food in a refrigerator or freezer, but by using the packaging film when handling the food to be stored or preparing before cooking, the food is handled or before cooking. If preparation can be done more easily, the need for packaging films will grow even more.

As a result of repeated studies on various packaging films by the present inventor, instead of enhancing the water vapor barrier property, a packaging film having a low water vapor barrier property is used, and a packaging film that allows water vapor to permeate to some extent is used. As a result, it was found that when used for food preservation, food handling and pre-cooking preparation can be performed more easily.

Therefore, the present invention satisfies the purpose of the packaging film to prevent the adhesion of dust and other debris and germs, and when the packaging film is used for preserving food, before handling or cooking the food. An object of the present invention is to provide a packaging film that can be prepared more easily.

As a result of diligent studies to solve the above problems, the present inventors have made a packaging film having a specific moisture permeability for packaging, which makes it easier to handle foods and prepare them before cooking. We have found that it is a film and have completed the present invention.

The present invention relates to the packaging film according to the following [1] to [4].
[1] A packaging film for adhering dew condensation water, which is used to adhere dew condensation water to the surface of the object to be packaged when the object to be packaged is packaged, at 40 ° C. and 90% of the packaging film. moisture permeability is 400g ^/ m 2 · 24hr or more under the condition of RH, packaging films for condensation water deposited.
[2] The 40 ° C. of packaging film, the moisture permeability under conditions of RH 90% is 600~1000g ^/ m 2 · 24hr, packaging films for condensation water adhering described in [1].
[3] The packaging film for adhering condensed water according to [1] or [2], wherein the object to be packaged is a frozen food.
[4] The packaging film for adhering dew condensation water according to [1] or [2], wherein the object to be packaged is a food product using powder.

According to the present invention, when the packaging film is used for preserving food while satisfying the purpose of the packaging film to prevent the adhesion of dust, dust and other debris and germs, before handling or cooking the food. It is possible to provide a packaging film that can be prepared more easily.

It is a figure which shows the adhesion state of the dew condensation water of the oil blotting paper made of Japanese paper in an Example.

Hereinafter, preferred embodiments of the packaging film of the present invention will be described in detail.
It should be noted that the embodiments described below do not limit the invention according to the claims, and all of the elements and combinations thereof described in the embodiments are the means for solving the present invention. It is not always required.

(Packaging film)
The packaging film for adhering dew condensation water of the present invention is used to adhere dew condensation water to the surface of the object to be packaged when the object to be packaged is packaged.
Packaging films for condensation water adhering of the present invention is 40 ° C., a moisture permeability under conditions of RH 90% is 400g ^/ m 2 · 24hr or more.

Since the packaging film of the present invention has excellent moisture permeability, it easily permeates water vapor. Therefore, by storing the packaged object under predetermined conditions after packaging using the packaging fill of the present invention, dust, dust, etc. can be used by utilizing the temperature difference between the packaged object and the outside air atmosphere and the saturated water vapor pressure difference. Condensed water, which is water generated by dew condensation, can be attached to the surface of the packaged object while protecting it from foreign matter.

<Resin composition>
The packaging film of the present invention contains a resin composition as a raw material thereof. In the present specification, the resin composition refers to a composition containing a resin as a main component and, if necessary, other components. Hereinafter, preferable components of the resin composition will be described.

<< Resin >>
Examples of the resin that can be used for the packaging film of the present invention include polyvinyl chloride resin, polyvinylidene chloride resin, polyethylene resin, polybutadiene resin, polypropylene resin, polyester resin and the like. It is not particularly limited to these. These can be used individually by 1 type or in combination of 2 or more types. Among these, polyvinyl chloride-based resins are preferable from the viewpoint of obtaining excellent moisture permeability.

Examples of the polyvinyl chloride-based resin include polyvinyl chloride, a copolymer of a vinyl chloride monomer and a monomer copolymerizable therewith, and the like. The copolymer may be a binary system in which the monomer is a binary system or a plural system in which the monomer is a ternary system or more, and may be a random copolymer or a block copolymer. Examples of the copolymer include a vinyl chloride / vinyl acetate copolymer, a vinyl chloride / (meth) acrylic acid copolymer, a vinyl chloride / methyl (meth) acrylate copolymer, and a vinyl chloride / (meth) acrylic acid. Ethyl copolymer, vinyl chloride / maleic acid ester copolymer, vinyl chloride / ethylene copolymer, vinyl chloride / propylene copolymer, vinyl chloride / styrene copolymer, vinyl chloride / isobutylene copolymer, vinyl chloride / Vinylidene chloride copolymer, vinyl chloride / styrene / maleic anhydride ternary copolymer, vinyl chloride / styrene / acrylonitrile ternary copolymer, vinyl chloride / butadiene copolymer, vinyl chloride / isoprene copolymer, vinyl chloride -Examples include chlorinated propylene copolymer, vinyl chloride / vinylidene chloride / vinyl acetate ternary copolymer, vinyl chloride / acrylonitrile copolymer, vinyl chloride / various vinyl ether copolymers and the like. These can be used individually by 1 type or in combination of 2 or more types.

When a polyvinyl chloride-based resin is used as the resin, the degree of polymerization of the polyvinyl chloride-based resin is not particularly limited, but is preferably 800 or more, and more preferably 950 or more, from the viewpoint of the mechanical properties of the film. When the degree of polymerization of the polyvinyl chloride resin is 800 or more, there is no possibility that the film becomes brittle. On the other hand, the degree of polymerization of the polyvinyl chloride resin is preferably 2500 or less, and more preferably 1500 or less. When the degree of polymerization of the polyvinyl chloride resin is 2500 or less, the melt viscosity of the polyvinyl chloride resin does not become too high, and there is no possibility that the hot melt moldability becomes poor.
The degree of polymerization of the polyvinyl chloride resin is the average degree of polymerization measured according to JIS K 6720.

When a polyvinyl chloride-based resin is used as the resin, the content of the polyvinyl chloride-based resin is not particularly limited, but is preferably 90% by mass or more, more preferably 95% by mass or more, based on the total amount of the packaging film. .. The content of the polyvinyl chloride resin is not particularly limited, but is preferably 99.5% by mass or less, more preferably 99% by mass or less, based on the total amount of the packaging film. By setting the content of the polyolefin resin to be equal to or higher than the above lower limit value and lower than the upper limit value, it tends to be easy to obtain a packaging film having a particularly preferable moisture permeability.

<< Other additives >>
As other additives, various additives usually used for producing a packaging film can be arbitrarily used.
Examples of the additive include a plastic agent, a stabilizer such as calcium / zinc-based metal soap and hydrotalcite, a chlorine trapping agent (hydrotalcite compound, zeolite compound, metal soap, etc.), and an antioxidant (phosphorus). System, phenol type, sulfur type, etc.), light stabilizer (hindered amine type, etc.), epoxy compound (epoxidized soybean oil, etc.), β-diketone compound, perchlorate, polyhydric alcohol, pigment, lubricant, cross-linking agent , Anti-static agent, anti-fog agent, anti-plate-out agent, surface treatment agent, flame retardant, filler, fluorescent agent, epoxy agent, bactericidal agent, metal deactivator, mold release agent, processing aid, etc. ..

(Physical characteristics of packaging film for adhering condensed water)
<Humidity permeability>
Moisture permeability of the packaging film is preferably 400g ^/ m 2 · 24hr or more, more preferably 500g ^/ m 2 · 24hr or more, and more preferably 600g ^/ m 2 · 24hr or more. Further, the moisture permeability of the packaging film is preferably not more than 1,500g ^/ m 2 · 24hr, more preferably at most ^{1,200g / m 2 · 24hr, 1,000g} / m 2 · 24hr or less Is more preferable. When the moisture permeability is at least the above lower limit value, the air in the internal space can be easily moved, and sufficient dew condensation water can be obtained inside the packaging film. Further, when the moisture permeability is not more than the above upper limit value, it is possible to prevent the packaged object from drying.
The moisture permeability of the present invention is a value measured under the conditions of a temperature of 40 ° C. and a relative humidity (RH) of 90% in accordance with JIS Z 0208: 1976.

<Thickness>
The thickness of the packaging film of the present invention is not particularly limited as long as the moisture permeability is within the above range, but is usually 5 μm to 30 μm. When the thickness is at least the above lower limit value, barrier properties as a packaging film can be easily obtained, and when the thickness is at least the above upper limit value, sufficient flexibility can be easily obtained.

<Thermal conductivity>
The thermal conductivity of the packaging film is usually preferably low from the viewpoint of adhering condensed water to the surface of the object to be packaged.
The thermal conductivity of the packaging film is preferably 0.01 or more and 3.0 W / m · K or less. When the thermal conductivity is at least the lower limit of the above range, the heat insulating property of the packaging film can be suppressed to a low level, and sufficient dew condensation water can be easily obtained inside the packaging film. When the thermal conductivity is not more than the upper limit of the above range, heat dissipation of the packaging film can be suppressed, and it is easy to suppress the formation of condensed water on the outer surface of the packaging film.

(Manufacturing method of packaging film)
The packaging film of the present invention is not particularly limited, and the molten resin is made into a sheet by using various conventionally known methods, for example, a single-layer or multi-layer T-die or I-die connected to a screw type extruder. Extruded cast molding method, inflation molding method in which molten resin is extruded into a tube shape using a circular die and expanded by the air pressure inside, calendar molding method in which the kneaded material is rolled with multiple hot rolls and processed into a sheet shape. , A solution method is used in which a solution is poured onto a drum (casting drum) or a stainless steel smoothing belt whose surface is smoothed by dissolving it in a solvent such as water to adhere it, and this is dried by passing it through a heating step. it can.
As a method for producing a packaging film of the present invention, for example, a resin composition can be extruded with an inflation extruder to obtain a raw material of the film, which can be rewound with a rewinding machine to produce a packaging film. .. Further, the draw ratio of the packaging film can be appropriately adjusted for the purpose of obtaining a specific moisture permeability. Further, from the viewpoint of imparting and promoting antifogging property, antistatic property, adhesiveness and the like, treatment such as corona treatment and aging may be performed, and surface treatment and surface treatment such as coating may be performed.

(Use of packaging film)
Since the packaging film of the present invention described above has excellent moisture permeability, dew condensation water adheres to the packaged object by storing the packaged object under predetermined conditions after packaging using the packaging fill of the present invention. Can be done.
Hereinafter, a suitable method of using the packaging film for adhering dew condensation water of the present invention will be specifically described.

<Glazing treatment on low temperature objects such as frozen foods>
Conventionally, it has been known that in frozen foods, peculiar deterioration occurs during long-term frozen storage. In order to prevent this deterioration, a thin ice film (glaze) is usually formed on the surface of frozen food by spraying water or immersing it in water.
Since the conventional glaze treatment requires spraying water or immersing it in water, it is difficult to form an ice film as a frozen food in foods that easily absorb water or foods containing powders. ..

Using the packaging film of the present invention, a low-temperature object to be packaged such as a frozen food having a temperature lower than the outside air atmosphere (for example, room temperature) is packaged, and the object to be packaged at a low temperature is allowed to stand in an external atmosphere for a predetermined time. By adhering dew condensation water on the surface and freezing the adhering dew condensation water at a low temperature, glaze can be formed on a low temperature object to be packaged such as frozen food.
That is, by using the packaging film of the present invention, glaze treatment of frozen foods and the like can be easily performed.
Further, since the packaging film of the present invention does not require conventional treatment such as spraying water, it is particularly preferably used as a packaging film for glaze treatment of foods that easily absorb water and foods containing powders. Can be done.

<Improvement of handling of packaged items such as food>
Conventionally, when removing a package such as a packaging film from a packaged object such as food, it may be difficult to remove the packaged object in the case of the packaged object having high adhesion to the film.
In addition, when removing a package such as a packaging film from a packaged object such as food, the packaged object may be directly touched and removed. In particular, in the case of foods that are not heat-treated after being removed from the packaging film, bacteria and viruses may transfer to the foods if touched by hand, which may cause food poisoning, and there is room for improvement in hygiene.

The packaged object of the present invention is stored in a low temperature atmosphere lower than the external atmosphere, and then placed in a hotter and humider environment than the low temperature atmosphere to form a water film on the surface of the packaged object. Can be formed.
The slipperiness of the packaged object is improved by passing a water film between the surface of the packaged object such as food and the packaging film, and the packaged object can be easily detached from the packaging film. Can be easily taken out.
In addition, since a water film can be formed without directly touching the packaged object such as food, the transfer of bacteria and viruses from the hand to the packaged object can be suppressed, which is excellent in hygiene.
Since the packaging film of the present invention can easily and hygienically take out the packaged object such as food, it can be suitably used as a packaging film for improving the handling of the packaged object such as food.

<Improvement of preparation before cooking in packaged items such as food>
In recent years, there has been a tendency to keep calorie intake low from the viewpoint of preventing adult diseases. For example, powders such as bread crumbs used in fried foods absorb a large amount of oil when fried in oil. Therefore, the obtained fried food has a high calorie content, and there is a need to prevent excessive powder such as bread crumbs used in the fried food from adhering to the food. As a preparation for fried foods, there is a cooking method in which powder is directly sprinkled to reduce the amount of powder used and then fried in oil, but it has been difficult to uniformly coat the powder on the entire food.

Using the packaging film of the present invention, fried foods and baked foods sprinkled with powder such as bread crumbs are packaged, stored in a low temperature atmosphere lower than the external atmosphere, and then hotter and more humid than in the low temperature atmosphere. By allowing the food to stand in an environment, the surface of the food condenses and the powder absorbs moisture, so that the powder can be uniformly and strongly adhered to the entire food. Since the powder is strongly adhered, it is possible to easily remove more than the required amount of powder only by applying appropriate vibration.
Further, even when the powder itself is seasoned, when the food is used for fried foods, baked foods, etc., the powder that absorbs a large amount of oil due to dew condensation does not excessively adhere to the food. Therefore, the obtained foods such as fried foods and grilled foods can be suppressed to low calories.
Therefore, the packaging film of the present invention can simplify the time and effort required for preparation of foods and the like using powder before cooking, and is suitable as a packaging film for improving the preparation of foods and the like before cooking. Can be used.

(Packaged item)
The object to be packaged in the film to be packaged of the present invention described above is not particularly limited and may be appropriately selected depending on the intended use and purpose. The packaged object is usually preferably one having a low thermal conductivity from the viewpoint of maintaining a state in which the temperature difference from the outside air is large.
The packaged material is preferably used for food, but can also be used for articles other than food. Among the foods, frozen foods, foods using powder, foods for which hygiene management is particularly required, and the like are more preferable.
The frozen food is a food that is stored at a temperature (about −5 ° C. or lower) generally found in a domestic freezer and an industrial freezer, and is not limited to the type of food.
The powder of the food using the powder is not particularly limited as long as it is in the form of powder, and examples thereof include wheat flour, bread crumbs, starch, rice flour, tempura flour, salt, pepper, powdered sugar and the like.
Foods for which hygiene management is particularly required include, for example, foods for subjects with weakened immunity, and specific examples thereof include long-term care foods and infant / infant foods.

Hereinafter, the present invention will be specifically described with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the present invention is not limited to the following examples.

(Evaluation of packaging film using metal balls as the object to be packaged)
First, the test results using a metal ball as an example of the object to be packaged will be described. Table 1 shows the resin and moisture permeability of the resin composition of the film used for the evaluation. The value of moisture permeation was calculated in accordance with JIS Z 0208: 1976 under the conditions of a temperature of 40 ° C. and a relative humidity of 90%.

[Evaluation method]
The evaluation of the packaging film in each Example and Comparative Example was carried out by the following method.
<Presence or absence of condensation>
A metal ball (1 cm in diameter) is wrapped in Japanese paper oil blotting paper (10 cm x 10 cm), and the wrapped Japanese paper oil blotting paper is wrapped with the wrapping film (15 cm x 15 cm) in each Example and Comparative Example, and -20 It was stored frozen for 1 day in a freezer at ° C. After the freezing storage, the mixture was allowed to stand at room temperature (temperature 26 ° C., humidity 57% RH) for 1 minute, the packaging film was peeled off, and the presence or absence of dew condensation was evaluated according to the following criteria. FIG. 1 is a diagram showing a state in which dew condensation water adheres to Japanese paper oil blotting paper. The results are shown in Table 2.
◯: Good (condensation water adheres to Japanese paper oil blotting paper)
×: Defective (condensation water does not adhere to Japanese paper oil blotting paper)

<Amount of condensation>
In the evaluation of the presence or absence of dew condensation water, when the dew condensation water adhered to the oil blotting paper made of Japanese paper, the amount of dew condensation was evaluated according to the following criteria. The results are shown in Table 2.
◯: Good (the area wet by dew condensation is 80% or more of the area of Japanese paper oil blotting paper)
Δ: Slightly good (the area wet by dew condensation is 30% or more of the area of Japanese paper oil blotting paper)
×: Defective (the area wet by dew condensation is 10% or more of the area of Japanese paper oil blotting paper)

As is apparent from Table 2, the packaging film moisture permeability 126 g / m 2 ^· 24 hr or less Comparative Examples 1-7, whereas the condensation on Japanese paper made Blotting paper was not observed, moisture permeability the packaging film 400g / m 2 ^· 24hr or more of examples 1 to 4, condensation on Japanese paper made Blotting paper was observed, and the amount of dew condensation was good or slightly better.
Therefore, the packaging films of Examples 1 to 4 are stored in a low temperature atmosphere lower than the external atmosphere, and then placed in a higher temperature and higher humidity environment than the low temperature atmosphere, so that the surface of the object to be packaged is covered. A film of water can be formed on the surface.
Since the packaging film of Examples 1 to 4 can easily and hygienically take out the packaged object such as food, it can be suitably used as a packaging film for improving the handling of the packaged object such as food. it can.

(Evaluation of packaging film using foods that use powder as the object to be packaged)
The test results will be described using the packaging films of the examples and comparative examples shown in Table 1 as examples of foods using powder as the object to be packaged.

<Amount of condensation>
Powdered sugar was spread thinly as a powder on a packaging film, frozen cookie dough as a food was placed on it, wrapped, and stored frozen in a freezer at −20 ° C. for 1 day. After the freezing storage, the mixture was allowed to stand at room temperature (temperature 25 ° C., humidity 55% RH) for 10 minutes, the packaging film was peeled off, and the amount of dew condensation was evaluated according to the following criteria. The results are shown in Table 3.
◯: Good (condensation was formed on the entire surface of the cookie dough)
△: Slightly good (the surface of the cookie dough was slightly dewed)
×: Defective (the surface of the cookie dough had almost no condensation)
<Amount of powder adhered>
When the dew condensation water was good or slightly good in the evaluation of the presence or absence of the dew condensation water, the powder adhesion amount was evaluated according to the following criteria. The results are shown in Table 3.
◯: Good (powdered sugar was moist and adhered to the entire surface of the cookie dough)
△: Slightly good (powdered sugar was moist and adhered to almost the entire surface of the cookie dough)
×: Defective (powdered sugar became translucent due to the oil content of the cookie dough and adhered)

Table 3 As is apparent, the packaging film moisture permeability 126g / m 2 ^· 24hr or less in Comparative Examples 1-7, whereas the powdered sugar was not adhered cookie dough is condensation, Toru humidity in packaging film 400g / m 2 ^· 24hr or more examples 1 to 4, powdered sugar condensation were observed to have adhered moist powder coating weight was good or slightly better ..
Therefore, the packaging films of Examples 1 to 4 wrap fried foods and baked foods sprinkled with powder such as bread crumbs, store them in a low temperature atmosphere lower than the external atmosphere, and then store them in a lower temperature atmosphere than in the low temperature atmosphere. Moreover, by allowing the food to stand in a humid environment, the surface of the food is dewed and the powder absorbs moisture, so that the powder can be uniformly and strongly adhered to the entire food. Since the powder is strongly adhered, it is possible to easily remove more than the required amount of powder only by applying appropriate vibration.
The packaging films of Examples 1 to 4 can simplify the time and effort required to prepare the food or the like using powder before cooking, and are suitable as a packaging film for improving the preparation of the food or the like to be packaged before cooking. Can be used for.

As is apparent from the above results, the condensation amount in accordance moisture permeability in packaging film 400g / m 2 ^· 24hr or more of Examples 1 to 4, none of the powder coating weight is good or slightly better, Toru It can be seen that, as compared with the packaging films of Comparative Examples 1 to 7 having a humidity of 126 or less, the packaging film for adhering dew condensation water has excellent performance.
That is, it can be seen that the packaging films of Examples 1 to 4 exhibit excellent performance as a packaging film for adhering dew condensation water because the moisture permeability is in a specific range.

As is clear from the above results, the packaging film of the present invention satisfies the purpose of the packaging film to prevent the adhesion of dust and other debris and germs, and the packaging film can be used for food storage. When used, it has the feature that food can be handled more easily and preparation before cooking can be performed more easily.

The packaging film of the present invention satisfies the purpose of the packaging film to prevent the adhesion of dust and other debris and germs, and when the packaging film is used for food storage, it handles and cooks food. The previous preparation can be done more easily.

Claims (4)

A packaging film for adhering dew condensation water used to adhere dew condensation water to the surface of the object to be packaged when the object to be packaged is packaged, and the conditions of the packaging film at 40 ° C. and 90% RH. is moisture permeability 400g ^/ m 2 · 24hr or more under, packaging films for condensation water deposited. The 40 ° C. of packaging film, the moisture permeability under conditions of RH 90% is 600~1000g ^/ m 2 · 24hr, packaging films for condensation water adhering of claim 1. The packaging film for adhering condensed water according to claim 1 or 2, wherein the object to be packaged is a frozen food. The packaging film for adhering dew condensation water according to claim 1 or 2, wherein the object to be packaged is a food product using powder.

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