JP2003137342A - Packaging material for paper-made pack having straw insertion hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for a paper-made pack having an straw insertion hole capable of being recycled by separating the paper material dissolved in water. SOLUTION: The straw insertion hole 5 is formed in a predetermined position of a carton paper 3 excluding the molten polyethylene layer 13 on its reverse surface, the carton paper having a low density polyethylene film 4 laminated on its front surface and a molten polyethylene layer 13 laminated on its rear surface wherein a water proof barrier layer 7 obtained by laminating low density polyethylene films 12 and 14 on front and rear surfaces of a film material 10 made by forming a vacuum evaporation silica coat 9 on a 5 to 8.5 μm thick stretched polyester film 8 is laminated on at least a portion corresponding to the straw insertion hole 5 of the molten polyethylene layer 13 with a low density polyethylene film 12 disposed between them and a shading ink layer 11 is arranged between the vacuum evaporation silica coat 9 of the film material 10 and the low density polyethylene film 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material having a straw insertion hole for inserting a straw therein and sucking a beverage to make a paper pack for drinking.

[0002]

2. Description of the Related Art As a conventional packaging material for a paper pack having a straw insertion hole, the surface of the paper is laminated, and the straw insertion hole is also covered on the back surface of the paper material having the straw insertion hole at a predetermined portion. It is known that after lamination, an aluminum foil having a low moisture permeability is laminated on the front and back surfaces at a position corresponding to the straw insertion hole on the back surface and laminated on the front and back surfaces with a polyethylene film. Then, this packaging material is formed into a paper pack by folding the aluminum foil inside so as to have a predetermined shape.

[0003]

The paper pack made of the above-mentioned conventional packaging material using aluminum foil is laminated by the current recycling system in which the paper material is dissolved in water and separated from other materials. Due to the specific gravity, the aluminum foil that has been subjected to the process floats in the paper material that is dissolved in water, and the aluminum foil and the paper material are mixed, so it is difficult to separate the two. It was For this reason, the conventional paper-made pack cannot be recycled, and there is a problem that it must be treated as general paid waste.

An object of the present invention is to solve this problem and provide a packaging material for a beverage pack having a straw insertion hole which can be recycled.

[0005]

In order to achieve the above object, the straw insertion hole for protecting the contents is closed by a water resistant barrier layer having excellent gas barrier properties, and the water resistant barrier layer Meets the two conditions of being easily and surely pierced by the insertion of a straw, and the specific gravity of the water resistant barrier layer is smaller than 1 so that it can be recycled, and it floats above the paper material dissolved in water. hand,
It must be easy to separate.

A polyester film is known as a resin film having an excellent gas barrier property, but the polyester film has a high puncture strength and has a disadvantage that it is difficult to pierce with a straw. On the other hand, the polyethylene film has an advantage that it has a low puncture strength and does not adversely affect beverages, but has a disadvantage that it has poor gas barrier properties.

As a result of various experiments, the present inventors have found that the puncture strength is reduced when silica, alumina or a mixture of silica and alumina is vapor-deposited on a polyester film. The present invention has been accomplished based on the finding that the stretched polyester film subjected to silica vapor deposition coating, alumina vapor deposition coating, or silica / alumina vapor deposition coating is optimal.

Here, FIG. 3 and FIG.
Will be described with reference to. FIG. 3 is an enlarged vertical cross-sectional view showing an experimental state in which a film material is pierced by a straw, 20 is a sample mounting table, 21 is a straw, 22 is a tester measuring head, 2
3 is carton paper, 24 is a straw insertion hole, and 25 is a film material. In addition, FIG. 4 shows the film material A obtained only by the stretched polyester, the film material B obtained by subjecting the stretched polyester to the silica vapor deposition coating, and the film material C obtained by subjecting the stretched polyester to the alumina vapor deposition coating obtained by the experiment.
4 is a comparative table showing the relationship between the thickness and the puncture strength of four types of film materials A, B, C, and D using a film material D obtained by applying a silica / alumina mixed vapor deposition coat to drawn polyester. From the values in this comparison table, it can be understood that the relationship between the thickness of each film material B, C, D and the puncture strength is almost the same, and the puncture strength is obviously smaller than that of the film material A.

Considering general users, especially elderly people and children, the piercing strength of the film material with a straw is 63
While it is desirable that the thickness is less than 0 g / 1 mmφ, the thickness of the film material is desirably 5 μm or more from the viewpoint of processability. As can be understood from FIG. 4, in the film material A, when the thickness becomes 6.8 μm, the piercing strength becomes 630 g / 1 mmφ, which exceeds the upper limit of the suitable range, and therefore the range of processability is narrow, 5 μm to 6.7 μm. In contrast,
For the film materials B, C and D, the piercing strength is within the suitable range of 630 g / 1 mm unless the thickness exceeds 8.5 μm.
Since it is less than φ, the range of processability is 5 μm to 8.5.
It is as wide as μm.

Then, a silica vapor deposition coat is applied to 200Å to 8
It is formed with a thickness of 00Å, and the film material B has a thickness of 5 μm or more.
It was confirmed that in the case of 8.5 μm, the gas barrier property and the water permeability are as practical as the conventional aluminum foil. As a specific example, when the thickness of the silica vapor deposition coat is 500Å and the thickness of the film material B is 7 μm, the oxygen barrier is 1.9 cc / cm ² · 24 hr, and the moisture permeability is 1.7 g / m ² · 24 hr. Met. Also,
For film materials C and D, each vapor deposition coat is 200Å
When the thickness of each film material C and D is 5 μm to 8.5 μm, the film materials C and D have the same practicality as the conventional aluminum foil in terms of gas barrier property and moisture permeability. I was able to confirm.

Based on the above findings, the packaging material of the paper pack having the straw insertion hole according to the present invention is stretched at least at the portion corresponding to the straw insertion hole of the paper material having the straw insertion hole at the predetermined position. A polyester film is laminated with a water resistant barrier layer having a film material obtained by applying one of silica vapor deposition coating, alumina vapor deposition coating, and silica / alumina mixed vapor deposition coating.

In the above structure, the front and back surfaces of the paper material are laminated with a low density polyethylene film, and at least a portion of the back surface side of the low density polyethylene film corresponding to the straw insertion hole has a thickness of 5 μm to 8. 5μ
It is preferable that a water resistant barrier layer formed by laminating a low-density polyethylene film on the front and back surfaces of a film material obtained by vapor-depositing a stretched polyester film of m is laminated via one low-density polyethylene film. Here, the thickness of the vapor deposition coat is preferably in the range of 200Å to 800Å, but is most preferably in the range of 200Å to 500Å.

Further, it is more suitable to maintain the quality of the contents by interposing a light-shielding ink layer between the vapor deposition coat of the film material and the low density polyethylene film.

[0014]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Here, FIG. 1 of the accompanying drawings is a perspective view of a paper pack, and FIG. 2 is a partial vertical sectional view of a packaging material.

As shown in FIGS. 1 and 2, a paper pack 1
In the packaging material 2, the outer surface of the carton paper 3 having a thickness of about 300 μm, which is a paper material, is laminated to provide the low density polyethylene laminate layer 4 having a thickness of about 15 μm, and the straw insertion hole 5 is provided at a predetermined portion. On the other hand, the inner surface of the carton paper 3 has a thickness of 20 μm formed by laminating.
Main body 6 formed by laminating molten polyethylene layer 13
And a water resistant barrier layer 7 laminated on the inner surface side of the main body 6.

The water resistant barrier layer 7 has a thickness of 50 μm on a stretched polyester film 8 which is a resin film having a thickness of about 7 μm.
A light-shielding ink layer 1 having a thickness of about 3 μm is formed on one surface of a film material 10 formed by vapor-depositing a silica vapor deposition coat 9 having a thickness of about 0 Å.
The low density polyethylene film 12 having a thickness of 25 μm is adhered to the other surface of the film material 10 while the low odor low density polyethylene film 14 having a thickness of about 30 μm is adhered to the other surface of the film material 10. Reference numerals 15 and 16 denote the light-shielding ink 11 and the low-density polyethylene film 1.
2 and the low-odor low-density polyethylene film 14 and the stretched polyester film 8 are attached to each other.

The film material 10 comprises a stretched polyester film 8 having a thickness of 7 μm and a silica vapor deposition coat 9 having a thickness of 500 Å deposited thereon. Therefore, as shown in FIG. 4, the piercing strength by a straw is about 570 g / 1 mmφ. Yes,
While maintaining the ease of processing, it is easy to pierce the straw. Further, since the light-shielding ink layer 11 is laminated on the film material 10, the light-shielding property is further improved, light rays are prevented from entering the paper pack 1 through the straw insertion hole 5, and the content is more surely ensured. It is intended to prevent the quality of the beverage, which is a product, from changing.

Since the inner surface side of the water resistant barrier layer 7 (the surface that comes into contact with the beverage) is composed of the low odor low density polyethylene film 14, other films 8 and 1 forming the water resistant barrier layer 7 are formed.
Odors such as 2, 13 are blocked and do not enter the beverage.

The packaging material 2 constructed as described above is folded into a box shape with the water resistant barrier layer 7 inside and the straw insertion hole 5 located outside, and the beverage is fed from the top. After filling, close the upper part with the upper surface,
The sealed paper pack 1 is prepared. And
The thus-prepared paper pack 1 is for inserting a straw through the water resistant barrier layer 7 inside the straw insertion hole 5 at the tip thereof when drinking.

The present invention is not limited to the above-described embodiment. For example, instead of the silica vapor deposition coat 9 of the film material 10, an alumina vapor deposition coat or an alumina / silica mixed vapor deposition coat may be used. .
Further, the thickness of the constituent elements of the water resistant barrier layer 7 including the film material 10 is not limited to the above-mentioned numerical examples. Further, the water resistant barrier layer 7 may be provided only in the portion corresponding to the straw insertion hole 5.

[0021]

As described above, according to the packaging material for a paper pack of the present invention, the straw hole can be closed to ensure the gas barrier property, while the closed straw insertion hole can be easily and surely pierced by the straw. In addition, since the paper material dissolved in water and other materials are easily separated from each other, there is an effect that the recycling process can be easily performed by using the recycling device according to the current method.

Particularly, according to the packaging material for a paper pack according to claim 3 of the present invention, in addition to the above-mentioned effects, the light-shielding property is further improved, and the deterioration of the beverage as the content is prevented more reliably. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a perspective view of a paper pack.

FIG. 2 is a partial vertical sectional view of a packaging material.

FIG. 3 is an enlarged vertical sectional view showing an experimental state in which a film material is pierced by a straw.

FIG. 4 is a film material A made only of stretched polyester and a film material B made by coating silica on the stretched polyester by vapor deposition.
And the thickness of four types of film materials A, B, C, and D using a film material C obtained by applying a vapor-deposited alumina to the stretched polyester and a film material D obtained by applying a silica-alumina deposition coating to the stretched polyester. The comparison table which shows the relationship with piercing strength.

[Explanation of symbols]

1 Paper pack 2 packaging materials 3 carton paper 4 Low density polyethylene laminate layer 5 straw insertion holes 6 body 7 Water resistant barrier layer 8 Stretched polyester film 9 Silica vapor deposition coat 10 film material 11 Light-shielding ink layer 12 Low density polyethylene film 13 Molten polyethylene layer 14 Low odor low density polyethylene film 15,16 adhesive

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiko Kurosu             1062-1 Shinnozuka, Nishinoshima, Komaki City, Aichi Prefecture             Niei Sangyo Co., Ltd. F-term (reference) 3E060 AA03 AB03 BA01 BC01 BC10                       CF04 DA14 DA20 DA21 DA23                       EA03 EA13                 3E067 AA03 AB26 AC01 BA06A                       BB03A BB14A BB25A BC06A                       CA30 EA06 EB30 FA01 FC01                       GD10                 3E086 AB01 AC07 AD24 BA04 BA14                       BA15 BA33 BA35 BB90 CA11                       DA08

Claims (4)

[Claims] 1. A paper material having a straw insertion hole formed at a predetermined position at least at a portion corresponding to the straw insertion hole,
A packaging material for a paper pack having a straw insertion hole, which is obtained by laminating a water resistant barrier layer having a film material obtained by applying a silica vapor deposition coat to a stretched polyester film. 2. A low-density polyethylene film on the back side is formed by forming a straw insertion hole at a predetermined position of a paper material laminated on the front and back sides with the low-density polyethylene film except for the low-density polyethylene film on the back side. Thickness of at least the portion corresponding to the straw insertion hole of
A straw characterized by laminating a low-density polyethylene film on the front and back surfaces of a film material obtained by subjecting a stretched polyester film of μm to 8.5 μm to vapor deposition of silica, and then laminating it through one low-density polyethylene film. Packaging material for paper packs with insertion holes. 3. A paper pack package having a straw insertion hole according to claim 2, wherein a light-shielding ink layer is interposed between the silica vapor deposition coat of the film material and the low density polyethylene film. Material. 4. The vapor deposition coat of a film material is replaced with a silica vapor deposition coat, and is constituted by either an alumina vapor deposition coat or a silica / alumina mixed vapor deposition coat. A packaging material for a paper pack having a straw insertion hole according to any one of claims.