JPH03205560A - Package - Google Patents

Abstract

PURPOSE:To impart water resistance and oil resistance to the package for packaging processed food by constituting this package of a sheet, the whole or a part of which has multilayered structures, using a polymethyl pentene film for the outermost layer of the multilayered structure part and applying ink having an oxygen detecting function on the front and rear surfaces thereof or the front surface of the 2nd layer. CONSTITUTION:A part of the 1st layer, i.e. the outermost layer A constituting the package is made into the multilayered structures and the polymethyl pentene obtd. by polymerizing 4-methyl pentene-1 having 5 to 100mum thickness is used for this purpose. For example, an extrusion lamination method which is high in productivity is used to form this film. Since the film has high transparency, the characters and line images printed on the rear of the film or the characters and line images printed on the 2nd layer are visible and since the film has the water resistance and the oil resistance, the penetration of the food in the film is prevented even if the film comes into contact with the food. Further, the dyeing from the outside is possible. The ink layer ID of an oxidation reduction dye, alkali agent, etc., having the oxygen detecting function is provided between the outermost layer A and the 2nd layer B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to packages and sheets. More specifically, the present invention relates to a package for an oxygen absorber having an oxygen detection function and a sheet having an oxygen detection function.

BACKGROUND OF THE INVENTION In recent years, the production of processed foods has become popular, and the development of technologies for maintaining their freshness has become a major issue.

Oxygen scavengers are one of the representative ones, and are widely used because of their simplicity and safety. Oxygen detection agents that detect the presence or absence of oxygen have also been developed and are used in some cases.

However, in general, the oxygen scavenger and the oxygen detector are prepared separately and used individually. When producing a large number of processed foods, the work of enclosing two bags is extremely low in productivity. Is it being considered whether oxygen detecting ink is printed on the oxygen absorber packaging to provide oxygen detection? (1) It is water and oil resistant and sanitary safe. A material with sufficient performance in terms of heat sealability, high productivity, and (3) sufficient functions as an oxygen scavenger and oxygen detector has not yet been developed.

Problem to be solved by the invention Even when used in conjunction with food, it is water and oil resistant and safe.
There is a need for the development of a packaging body for an oxygen absorber that is capable of high-speed filling, has high productivity, functions as an oxygen absorber and an oxygen detector, and has sufficient oxygen detection ability to function at the same time.

Means for Solving the Problems In order to solve the above-mentioned problems, we have made extensive studies and filed a patent application for the invention of a packaging body having the above-mentioned performance in Japanese Patent Application No. 1-84087. This time, further investigation led to the present invention. That is, the present invention has 1. A package consisting of a sheet having a multilayer structure, in whole or in part, wherein the outermost layer of the sheet having the multilayer structure is a polymethylpentene film, and the back surface or the second layer of the polymethylpentene film. A packaging body 2 for an oxygen absorber, the surface of which is coated with an ink having oxygen detection ability, all or part of which has a multilayer structure, and the outermost layer of the sheet having the multilayer structure is a polymethylpentene film. , and the back surface of the polymethylbentene film or the second
To provide a sheet having an oxygen detecting ability, characterized in that an ink having an oxygen detecting ability is coated on the surface of the layer.

The present invention will be explained in detail.

Although various shapes can be adopted as the packaging life shape of the present invention, typical shapes are shown in FIGS. 1 to 6.

In FIGS. 1 to 6, the outermost layer (first layer) A indicates the outermost layer of a multilayered seal provided on one part (one side) of the package, and usually has a thickness of 5 to 100 μm, more preferably is 10~
It is composed of polymethylbentene obtained by polymerizing 4-methylpentene-1 with a thickness of 50 μm.

For the production of polymethylpentene film, for example, a highly productive extrusion lamination method can be applied. This material has superior gas permeability to oxygen and carbon dioxide, about 10 times that of polyethylene and polypropylene films.

Polymethylpentene film has high transparency, and the characters and line drawings printed on the back side or the characters and line drawings printed on the second layer can be clearly seen from the outside.

Furthermore, it has water and oil resistance, and has the ability to prevent penetration of packaging materials or food products even if they come into contact with them, and can also prevent seepage from the inside.

ID (indicator) indicates the ink area coated (printed) with the oxygen detection agent, and is located between the outermost layer A and the second layer B, and preferably constitutes a part of the layer surface. .

As a method of construction, there are a method of printing on the back surface of the outermost layer A, and a method of printing on the front surface of the second layer B.

The ink having oxygen detection ability may be either water-based or oil-based ink. Inks with oxygen detection are usually composed of redox dyes, reducing agents, alkali agents, humectants, binders, and the like.

An example of an ink with oxygen detection ability is Japanese Patent Application No. 63.
-5 8 3 3 6, and the one described in JP-A-64-66561 is used, and its general composition is as follows.

Redox dye 0.001-2% by weight Alkaline substance 0.1-20 Reducing agent 0
．． 1 to 20 Other (water, bangu, solvent, filler, etc.) remaining amount
Preferred examples of the total 100% by weight alkaline substances include sodium bicarbonate, calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium phosphate, sodium phosphate, calcium phosphate, and the like.

Preferred examples of humectants include ethylene glycol, polyethylene glycol, propylene glycol, sorbitol, glycerin, calcium lactate, and sodium lactate.

Further preferred examples of the reducing agent include fructose, glucose, maltose and the like.

Furthermore, preferred examples of the binder include carboxymethylcellulose (CMC), methylcellulose (MC), hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC), polyvinylpyrrolidone (PVP), ethylcellulose (EC), and hydroxypropylmethylcellulose (HPMP). , sodium starch glycolate, sodium starch phosphate, propylene glycol alginate,
Sodium alginate, sodium polyacrylate,
"Pullulan" etc. can be mentioned.

t Such an ink having an oxygen detection capacity of 1 is usually printed at 1 to 20% by handwriting method, gravure printing method, screen printing method, etc.
0g/rr? It is coated (printed) on the back surface of the polymethylpentene film or the front surface of the second layer.

Next, the second layer B has a Gurley air permeability or preferably 100.
If it is convenient to use paper with a rate of 0 seconds/100 ml or less, a nonwoven fabric made of plastic or a microporous membrane made of plastic may be used. That is, the paper can be Japanese paper, Western paper, synthetic paper, or plastic mixed paper, and the nonwoven fabric can be made of plastic fibers such as polyethylene, polypropylene, polyester, or nylon, which are bonded into a sheet using heat, pressure, adhesive, etc. can be used. Specific examples thereof include Tyvek (manufactured by DuPont, USA), Breathlon (manufactured by Nitto Denko), and Spunbond (manufactured by Asahi Kasei Corporation). Alternatively, a perforated plastic film may be used. Examples of microporous membranes include those obtained by methods such as cold stretched films of polyethylene or polypropylene resins, stretching of foreign matter-containing films, and irradiation with electron beams.

Specific examples include Hypore (Asahi Kasei (II)), Microtex (Nitto Denko@), and NF Seat (Tokuyama Soda).
), etc. can be mentioned.

When the second layer B is made of paper as described above, or a plastic nonwoven fabric or microporous membrane that does not have a heat sealing function or has an inferior heat sealing function, it is preferable to provide a third layer C.

The third layer C usually has a lower softening point than the plastic forming the second layer B, and has a Gurley air permeability of 1000 seconds/1.
It is composed of a heat-sealable perforated plastic film, nonwoven fabric, or microporous plastic membrane of 00ml or less. Specific examples of the perforated plastic film include films made of materials such as polyethylene, polypropylene, polyethylene vinyl acetate copolymer, or polyethylene ionomer. Methods for preparing a sheet by laminating these outermost, second, and third layers include extrusion lamination, a dry method using emulsion or latex, or a wet method, which is commonly used when preparing laminates. A laminating method, a hot melt laminating method, etc. are used. An anchor coating agent may be used in combination with these methods.

The package of the present invention preferably has an outermost layer A and an ID second layer B.
, the third layer C is laminated in the order of A-ID-B or A-ID-B-C to obtain a sheet, and two sheets are stacked and sealed on all sides. Alternatively, the obtained sheet may be folded in two and sealed on three sides.

Alternatively, the package of the present invention may be obtained by sealing the obtained sheet and a sheet D not particularly specified on all sides.

The package of the present invention has the following features: (1) By employing a polymethylpentene film as the outermost layer, it has oxygen permeability even without perforation treatment, and a highly productive extrusion lamination method can be employed.

(2) Polymethylpentene film has high transparency, allowing the printed matter of the second layer and below to be seen through the film.

(3) By using polymethylpentene film as the outermost layer, it has high water, moisture, and oil resistance, and can be used in a wide range of foods without worrying about the contents leaking out.

(4) The softening point of polymethylpentene is higher than that of general-purpose polyethylene and polypropylene, and high-speed filling is possible without fusion to the heat bar during heat sheeting.

It has the following features. The package of the present invention is also characterized in that the oxygen permeation rate can be adjusted by varying the thickness of the outermost polymethylpentene film between 5 and 100 μm.

Further, in the present invention, all or a part thereof has a multilayer structure,
The outermost layer of the sheet having a multilayer structure is a polymethylpentene film, and the back surface of the polymethylpentene film or the front surface of the second layer is coated with an ink having an oxygen detection ability to avoid the presence of oxygen. It can also be used as a sensing material in systems. Such a sheet can also be manufactured in the same manner as described above.

Example The present invention will be explained in more detail with reference to Examples.

In the examples, parts indicate parts by weight.

Example 1. A perforated polyethylene film (20 μm thick) was superimposed on neutral paper (40 g/rd, manufactured by Shiroyama Paper Industries) and fused by hot melt lamination. 20g/rd of oxygen indicator ink of the following composition was applied to this neutral paper.
The floral pattern was gravure printed and dried.

2,6-dichloroindophenol 0. Part 5 Acid Red 106 0. 0
5 Baking soda
2 Frac I・-su 5
water
33,100 copies of polymethylpentene (TPX) were printed on neutral paper.
(manufactured by Mitsui Petrochemical) was extruded and laminated to a thickness of 15 μm to obtain a sheet body. The polymethylpentene film layer was transparent, and the floral pattern of the oxygen indicator (ink) printed underneath was fully visible.

The polymethylbentene layer of the obtained sheet is the outermost layer,
Separately, a polyethylene nonwoven fabric (Tyvek, manufactured by DuPont) was prepared, and this was used as the third layer.
(Iron-based moisture-dependent oxygen scavenger, manufactured by Nippon Kayaku ■), heat-sealed on all sides, and packaged with oxygen scavenger (
5 cTnX 5 cm) was obtained. (Fig. 6) The obtained package containing the oxygen absorber was placed in a commercially available bag containing cheese cod and sealed. After 20 hours at room temperature, observation revealed that the blue floral pattern printed on the oxygen absorber package had changed color to a red floral pattern. At this time, the oxygen concentration in the bag was measured with a zirconia oxygen meter (manufactured by Toray) and was 0.015%.
Met. This indicates that oxygen in the outer bag is absorbed by the oxygen absorber through the sheet of the package. In addition, this oxygen absorber-containing package is used in combination with high-moisture foods such as boiled noodles, bread, rice cakes, etc., foods with high oil and fat content such as Western confectionery such as palmkuchen, pound cakes, and pies, or is used in combination with printing ink seepage. Both showed sufficient water and oil resistance.

Example 2 Oxygen detector ink with the following composition was applied to pulp/polyethylene (50/50) mixed paper in a polka dot pattern at 25 g/rrr.
Gravure printing was carried out in the amount of .

2,6-dichloroindophenol 0.5 part Sumiplast Tread HFG 0. Magnesium dihydroxide 20 Baking soda
4 Fructose 6 Polyethylene glycol 600 10 Binder
60 As the binder in the above, 12 parts of ethyl cellulose (manufactured by Hercules) and 12.5 parts of toluene were added.
1 part, 30 parts of ethyl acetate, and 45 parts of isopropyl alcohol.

20% of polymethylpentene was applied to the printed surface of the obtained sheet.
The product was extruded and laminated to a thickness of μ to obtain a multilayered sheet (packaging material).

This sheet was folded in half with the polymethylpentene film side on the outside.Modulan S250 (manufactured by Nippon Kayaku,
It was filled with the contents of an iron-based self-reactive oxygen scavenger and heat-sealed on three sides. At this time, no fusion of the film to the heat bar was observed. (Fig. 1) The obtained oxygen absorber-containing package was wrapped with an oxygen-impermeable KON (stretched nylon coated with vinylidene chloride) film with a volume of 25 (W) and the humidity inside the package was adjusted to 90% with barium chloride saturated water. and exteriorized.24
When the package was allowed to stand for a while and observed, the polka dot pattern on the package had changed color from its original blue color to red. The oxygen concentration in the outer bag at this time was 0.05%, indicating that the oxygen in the outer bag was absorbed by the oxygen scavenger through the polymethylpentene film.

Example 3 A perforated polyethylene film (20 μm thick) was superimposed on neutral paper (50 g/rrl' manufactured by Utsunomiya Paper Industries) and fused by hot lamination. Letters were gravure printed on this neutral paper using an oxygen indicator ink having the following composition at 15 g/rd and dried.

Ink composition 2.6-dichloroindophenol 0.5 part Acid Red 106 0. 2 Polyethylene glycol 300 12.0 weight
Cao 2.
0 glucose 12.0 binder 45.0 alcohol (ethyl) 28. 3 As the above binder, r}{PC (hydroxypropyl cellulose)-SLJ (Nippon Soda ■) was dissolved in 50 W/W% alcohol (ethyl) and mixed to a predetermined ratio.

On the printed surface of the obtained sheet, polymethylpentene (containing 3% barium sulfate) was extruded and laminated to a thickness of 20 μm to obtain a multilayer package.

This package was made into a 50 mtn x 50 tnm bag with the polymethylpentene film side facing outside. This bag contains Hemoduran S-500 (Nippon Kayaku Oxygen Absorber)
The contents were packed and sealed.

When the obtained oxygen absorber-containing package was placed in a commercially available boxed sponge cake and sealed, the printed text changed color from blue to red after 24 hours, and the oxygen concentration inside the package at that time was 0.01. %Met.

Example 4. A perforated polyethylene film (thickness: 30 μm) was superimposed on neutral paper (50 g/%, manufactured by Utsunomiya Paper Industries) and fused using a hot lamination method. Characters were flexographically printed on this neutral paper using an oxygen indicator ink having the following composition at 20 g/rrf and dried.

Ink composition 2.6-dichloroindophenol 1.0 part Acid Red 106 0. 2 polyethylene glycol 300 12. 0 weight
Cao 2.0
Fructose 12.0 Binder 47.8 Alcohol (ethyl) 25. 0 As the above-mentioned binder, rHEC (hydroxyethyl cellulose)-SP500 J (Daicel Chemical Industry @) was added with water and dissolved by heating, and used in the above-mentioned parts by weight.

On the printed surface of the obtained sheet, polymethylpentene (containing 6% calcium carbonate) was extruded and laminated to a thickness of 25 μm to obtain a multilayer package. Example 3 from this package
A package containing an oxygen absorber was obtained in the same manner as above, and when it was sealed in a commercially available bag of rice cake products, the printed characters changed color from blue to red after 24 hours, and the contents of the package at that time changed. The oxygen concentration was 0.02%.

Effects of the Invention A package for an oxygen absorber having high oxygen permeability and oxygen detection ability was obtained.

Moreover, this packaging body has water resistance, oil resistance, and high speed filling property.

[Brief explanation of drawings]

1 to 6 show embodiments of the invention. Figure 1 shows the packaging material made of polymethylpentene film (outermost layer) and pulp/polyethylene mixed paper.
Packaging with individual seals. The ink is printed on mixed paper (second layer). FIG. 2 shows a package of the present invention sealed at two locations using a packaging material consisting of polymethylpentene film and a second layer. The ink is printed on the second layer. FIG. 3 shows a package of the present invention in which a packaging material consisting of polymethylpentene film and a second layer is used on only one side and sealed at two locations. Ink is printed on the second layer. Figure 4 shows polymethylpentene film, second layer and third layer.
The package of the present invention is sealed at l locations using a packaging material consisting of layers. Ink is printed on the second layer. Figure 5 shows polymethylpentene film, second layer and third layer.
The package of the present invention is sealed at two places using a packaging material consisting of layers. Ink is applied onto the second layer. FIG. 6 shows a package of the present invention in which the packaging material is made of polymethylpentene film, the second layer (neutral paper), and the third layer (polyethylene nonwoven fabric) and is sealed at two places using packaging materials on only one side. The ink is printed on acid-free paper (second layer). In Figures 1 to 6, A 1st layer (outermost layer, polymethylpentene film) B 2nd layer (paper, nonwoven fabric, etc.) C 3rd layer (heat-sealable film, nonwoven fabric, etc.) D Film or sheet E Release Acid material (oxygen absorbent) ID Indicates each ink that has oxygen detection ability.

Claims (1)

[Scope of Claims] 1. A package made of a sheet having a multilayer structure, in whole or in part, wherein the outermost layer of the sheet having a multilayer structure is a polymethylpentene film, and the outermost layer of the multilayer sheet is a polymethylpentene film. An oxygen absorber package 2 in which the back surface or the front surface of the second layer is coated with an ink having oxygen detection ability, all or part of which has a multilayer structure, and the outermost layer of the sheet having the multilayer structure It is a polymethylpentene film, and the back surface or second surface of the polymethylpentene film
A sheet having an oxygen detecting property, characterized in that an ink having an oxygen detecting property is coated on the surface of the layer.