JPH0621713Y2 - Laminated sheet for encapsulation - Google Patents

Description

[Detailed Description of the Device] (Field of Application) The present invention is applied to packaging of pharmaceuticals, foods, precision equipment, etc.
The laminated sheet to be sealed in the container has an oxygen absorbing function, and is intended to improve the preservation of the contents.

(Prior Art) In order to improve the preservation of medicines, foods, precision instruments, etc. and extend the shelf life, it is important to remove oxygen in bags and containers.

Currently, oxygen scavengers are used to remove the above-mentioned oxygen, but these are almost powdery or granular, and are packed into bags and containers in the form of small packages.

However, these sometimes make the packaging work complicated,
May pose a risk of accidental ingestion and ingestion to consumers.

(Problems to be Solved by the Present Invention) A problem to be solved by the present invention is to solve these drawbacks and provide a new laminated sheet.

(Means) The gist of the present invention is that water-absorbent paper or wet non-woven fabric is laminated on both sides of an oxygen-absorbing sheet layer (A) made of a thermoplastic resin mixed with iron powder and salt. Using the sheet for encapsulation.

The lower limit of the amount of water to be absorbed here is required to be liberated from the paper or the wet non-woven fabric and transferred to the oxygen absorbing sheet (A) to promote the oxidation reaction. Also,
The upper limit of the amount of moisture to be absorbed may be sufficient as long as it does not hinder the lamination with the oxygen-absorbing sheet (A).

The reason why water is applied to both sides of the oxygen-absorbing sheet is that iron powder is oxidized because sodium chloride, that is, sodium chloride is dissolved in water and ionized, and the reaction of binding iron powder and oxygen proceeds for the first time. Is.

As a laminating method, the partial adhesive application method is preferable because when the entire surface adhesive is applied, the surface of the oxygen-absorbing sheet is covered with the adhesive and moisture does not reach the surface of the oxygen-absorbing sheet. It is also possible to use double-sided tape instead of the adhesive.

Further, when an oily food or the like is used as the content, it is preferable to coat both surfaces of the paper (B) which has absorbed water with a layer having a large oxygen permeability and a large moisture permeability.

(Operation) These laminated sheets are cut into an appropriate size and used as encapsulating sheets. The encapsulating sheet is used by putting it in a packaging bag or container having a high oxygen barrier (oxygen impermeable) property. Even if the object to be stored is a dry food, medicine, etc., because a constant water content is always provided in advance on both sides of the oxygen-absorbing sheet (A), the oxygen-absorbing sheet always shows a constant oxygen absorption capacity. In other words, it has a storage function regardless of the contents.

(Example) FIG. 1 shows the structure of an encapsulating (oxygen absorbing) sheet.

As the oxygen-absorbing sheet (A), 150 parts of commercially available reduced iron powder 1 is added to 100 parts of low-density polyethylene.
A sheet having a thickness of 0.6 mm, which was mixed with 50 parts and 2 parts of sodium chloride and uniformly dispersed, was molded by a T-die method. Commercially available kraft paper having a thickness of 0.18 mm was used as the paper that absorbed moisture. Here, as a method of absorbing water, the paper is passed through a spraying device and then pressure-bonded by a pressure roll.

As a bonding method, double-sided tape is used for linear bonding.

In some cases, a paper impregnated with water, or a layer having an oxygen permeability and a moisture permeation preventive property on the outer surface of the wet-laid nonwoven fabric, for example,
It is also possible to use a low-density polyethylene film having a thickness of 30 μm.

(Effect of the Invention) By using a sheet having an oxygen absorbing function, a simple storage means can be realized. That is, the packaging form is simplified and accidental ingestion and accidental ingestion are eliminated.

[Brief description of drawings]

FIG. 1 shows the structure of the encapsulating laminated sheet. The moisture absorbing paper (B) 2 is linearly formed on both sides of the oxygen absorbing sheet (A) 1 by using a double-sided tape (the total area of the tape is 50
%). It corresponds to claim 1. FIG. 2 shows a structure in which low density polyethylene films 4 are laminated on both sides of the encapsulating laminated sheet of FIG. 1 by an extrusion laminating method. It corresponds to claim 2. FIG. 3 shows an embodiment example in which the encapsulating laminated sheet of the present invention is used in an oxygen impermeable bag.

Claims (2)

[Scope of utility model registration request] 1. An encapsulating laminated sheet obtained by laminating water-impregnated paper or a wet non-woven fabric (B) on both sides of an oxygen-absorbing sheet (A) prepared by blending a thermoplastic resin with iron powder and salt. . 2. The encapsulating laminated sheet according to claim 1, wherein a layer having oxygen permeability and moisture permeation preventive property is further laminated on the outer surface of the paper impregnated with water or the wet non-woven fabric.