JP3130790B2 - Degassing package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing package having a function of discharging gas generated inside the package to the outside of the package. The present invention relates to a degassing package for stored items that generates gas such as carbon dioxide gas over time during distribution.

[0002]

2. Description of the Related Art A package in which a thin non-sealed portion is provided in a seal portion of a bag to form an air passage so that gas generated from stored items can be released is described in, for example, Japanese Utility Model Application Laid-Open No. 61-8568. Have been. Regarding the shape of the seal portion, see, for example, Japanese Utility Model Laid-Open No. 48-91073,
No. 12712, Japanese Utility Model Laid-Open No. 50-123688, and the like.

[0003] However, each of these is a package having a valve mechanism by devising a seal portion of the package, and an unsealed portion is not completely shut off from the outside. There remains a problem that some gas flow is always recognized in between.

[0004] In some cases, only the valve mechanism is formed using a plastic resin or the like, and the molded product is attached to a package to form a degassing package. Although this has a satisfactory function, it is a relatively expensive degassing package because it requires equipment for assembling several parts and attaching to the package.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned problems of the gas venting package, and does not attach a valve mechanism separately to the package. An object of the present invention is to provide a relatively inexpensive and high-performance degassing package by selecting characteristics such as stiffness and adhesion of the packaging film itself in addition to the shape.

[0006]

In order to achieve the above object, according to the present invention, first, in the first invention, a fine unsealed portion is provided in a sealed portion of a package to form a ventilation path, and a package is formed. In a package capable of releasing generated gas, the film forming the package has a stiffness of 0.5 to 1.
2.0 gf / 25 mm width, and the seal portion is composed of two dashed seal lines partially leaving an unsealed portion, and the unsealed portions of these two seal lines are shifted from each other. The present invention provides a degassing package characterized in that these two sealing lines are alternately provided with convex portions protruding in directions facing each other.

To measure the waist strength of a film, a sample (constant width, 200 mm in length), which is a film, is bent in a loop shape, fixed in a direction (perpendicular to the width direction) that is not easily loosened by its own weight, and It was carried out by a method of evaluating the strength of the waist of the film by loading when the diameter direction was crushed (compression speed: 3.5 mm / sec.). As a measuring device, a loop stiffness tester manufactured by Toyo Seiki Seisaku-sho, Ltd. was used.

[0008] In a second aspect of the present invention, in the first aspect, the innermost layer of the film forming the package is a film having a property of being in close contact with each other when superposed on each other. It provides the body.

As described above, according to the present invention, a fine unsealed portion is provided at the seal portion of the package to form an air passage, and the film forming the package has a stiffness of 0.5. ~
Since it is in the range of 12.0 gf / 25 mm width, gas such as carbon dioxide gas generated inside the package breaks off a portion of the fine unsealed portion provided in the seal portion of the package where the film is in close contact. Go outside like so. When the gas generation subsides and the difference between the internal pressure and the external pressure disappears, the films adhere to each other again due to the stiffness of the films and function to maintain airtightness.

The close contact between the films is caused by the stiffness of the film and the shape retention that occurs when the film is sealed in a valve mechanism.

The above-mentioned adhesive property is caused by, for example, a static property of the film itself, self-adhesiveness, or a film modifier or the like kneaded into a resin when the film is formed. Further, when the innermost layers of the two superposed films forming the package are formed of films having a property of being in close contact with each other, the airtightness at times other than when gas is released is further maintained. The film used for the innermost layer is specifically a linear low-density polyethylene film,
Low density polyethylene films and the like can be preferably used.

[0012] The shape retention means that when two films are bonded by heat sealing, the rigidity (lumps) of the film is increased and the strength of the molded part itself is increased as compared with the case where only one film is bonded. This is the resilience obtained by complicating the seal pattern. Considering the heat shrinkage and adhesion of the film, when the film is heat-sealed, the sealed portion shrinks slightly more than the unsealed portion. The rate of shrinkage increases in proportion to the area to be sealed and the amount of heat received. For example, FIG.
In the case of the seal pattern shown in (a), the sealing portion (21) shrinks more than the unsealed portion (22) when sealed, so that the unsealed portion (22) is in a loosened state, and the film is quite rigid. However, it is difficult to stably maintain the adhesion even when using. In the case of a seal pattern as shown in FIG. 4B, the seal portion (23) shrinks more than the unsealed portion (24) as in FIG. Although loosening occurs, when comparing the X part and the X part of the unsealed part, the X part has a sealed area nearby, that is, the shrunk area is larger than the ○ part, so the X part is in the vertical direction The pulling force acts. For this reason, there is no loosening of the film in the X portion, and as a result, adhesion can be obtained. It seems to be unnecessary at first glance, but it is a necessary part to make a difference in contraction from the X part.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The gas release package of the present invention will be described in detail below based on one embodiment. The degassing package of the present invention is obtained by forming a bag of the laminated film for a degassing package using a seal bar configured such that the seal portion has a shape having a valve function. That is, the stiffness of the film forming the package is 0.5 to 12.0 as measured by a loop stiffness tester.
The film is not particularly limited as long as it is in the range of gf / 25 mm width and has a property of preventing gas such as oxygen which penetrates through the film to some extent. For example, gas barrier nylon having a thickness of 15 μm Film (hereinafter abbreviated as barrier ONY), vapor-deposited polyester film (hereinafter abbreviated as VMPET) of 12 μm provided with a silicon oxide vapor-deposited thin film having a thickness of 400 °, linear low-density polyethylene film (hereinafter abbreviated as LLDPE) having a thickness of 30 μm A laminated film obtained by laminating the three types of films in this order by a dry lamination method using a urethane-based adhesive can be preferably used as a laminated film for a degassing package. The waist strength of the film is 1
When the width exceeds 2.0 gf / 25 mm, the sealing performance of the valve mechanism becomes strong, but exhaust requires a large difference between the internal pressure and the external pressure. In order to facilitate exhaust, it is necessary to simplify the seal pattern, but the simple seal pattern is very weak to external mechanical stress, and it is difficult to maintain stable confidentiality when not exhausting Become. If the width is less than 0.5 gf / 25 mm, the film can be easily evacuated even if the difference between the internal pressure and the external pressure is small due to the lowering of the stiffness of the film. Become. For example, during evacuation, the unsealed part in the valve shape forms a space between the bonded films, and the gas passes through the created space and is exhausted. Unsealed portions may not adhere again.

Further, from the composite film for a gas release package produced in this manner, a gas release package which is a pillow packaging bag having a back seal portion (11) and a bottom seal portion (12) by using a special bag making machine. (10) is produced (see FIG. 1).

In this case, at least a part of the back seal portion (11) or the bottom seal portion (12) is formed into a shape of a seal bar of a bag making machine so as to have a shape having a valve function as shown in FIG. Keep it. For the shape of the seal portion, it is advantageous from the viewpoint of mass production efficiency at the time of bag making to form a pattern so that the same shape is continuously arranged. The bag is not limited to the pillow packaging bag of the present embodiment, but may be used without particular limitation, such as a three-side seal packaging bag or a gusset packaging bag, depending on the properties, weight, ease of use, etc. of the stored items.

Further, the shape of a seal portion having a valve function,
The size must be selected each time depending on the form of the stored material, the physical properties of the composite film to be used, and the like. For example, if the stored material is coffee beans ground to a diameter of about 1 to 3 mm, the seal portion width (x) is 15 mm. When the width (y) of the sealed portion is 2 mm and the width (z) of the unsealed portion is about 8 to 10 mm, the valve function is performed (see FIG. 2). Pillow packaging bag (10)
Then, an appropriate amount of the coffee beans ground to a diameter of about 1 to 3 mm is stored, and then the opening of the pillow packaging bag (10) is sealed and sealed. The sealing of this opening also has the above-mentioned valve function. Sealing may be performed using a seal bar having a shape having the seal bar. The gas generated from the stored item enters the sealed portion from the unsealed portion (z) on the stored item side, but the gas can be prevented from entering by the A block (A) and the B block (B), and the C block ( C), D block (D) plays the role of valve function.

In order to further adjust the gas release amount, it is preferable to change the shape of the seal bar, such as increasing or decreasing the width (x) and (y) of the seal portion, or increasing or decreasing the number of blocks.

The shape of the sealing portion is not limited to the above example.
(A), (b), and (c).

[0019]

Embodiment 1 An embodiment of the present invention will be specifically described below. <Example 1> A laminated film having the following structure is prepared as a laminated film for a degassing package. First, a barrier ONY having a thickness of 15 μm (trade name: Super Neal manufactured by Mitsubishi Chemical Corporation) and a VMPET having a thickness of 12 μm are laminated by a dry lamination method using a urethane-based adhesive.
Next, a 30 μm thick VMPET surface
The LLDPE of μm is laminated by a dry lamination method using a urethane-based adhesive to produce a laminated film for a gas release package.

From this laminated film, using a special bag-making machine, the length is 280 mm, the width is 75 mm and the width of the joint seal is 17 m.
Degassing package (10) which is a pillow packaging bag with a size of m
Is prepared. In this case, the shape of the seal bar of the joint seal portion is made to have the shape having the valve function shown in FIG. In this embodiment, the seal portion width (x) is 15 mm,
The seal width (y) was 2 mm, and the unsealed portion width (z) was 10 mm on the storage side and 8 mm on the outside air side. The shape of the seal bar is patterned so that the same shape is continuously arranged.

200 grams of roasted coffee beans are filled in the gasket seal bag, and the opening is heat-sealed with a heat sealer or the like, and then placed in a refrigerator at 8 ° C. and a room at 30 ° C. for accelerating the reaction for 17 days each. Leave for 3 days, 7 days, 10 days, 1
After 4 days and 17 days, the gas release property was checked, the reverse inflow prevention property was checked by a sensory test, and the stiffness of the laminated film for degassing packaging was measured as follows. 3 is shown. When the outside air or moisture flows backward through the ventilation path and enters the degassing package, the flavor of the coffee stored therein becomes worse. From this,
It turns out that the sensory test is an important inspection item. Also,
Check the gas release to "out" the gas in the vented package
The "inflow" of the gas in the degassing package is confirmed by checking the reverse inflow prevention by a sensory test, and both of them can be said to have "valve function" for the first time. Confirmation of outgassing property; Visual confirmation of inflating state of bag. 6 bags for each subject. ：: A state in which gas such as carbon dioxide gas escapes without expanding the bag. Δ: Slightly poor state of generated carbon dioxide gas etc. ×: The generated carbon dioxide gas or the like accumulates in the bag, the bag is inflated, and gas escape is poor. Sensory test: evaluation of flavor. Average of evaluations by 12 panelists. 6 bags for each subject. 5: Freshly roasted flavor is maintained. 4: good. 3: Slight deterioration. 2: Deterioration. 1: Significant deterioration. Waist strength; by loop stiffness tester. Unit gf / 25mm width.

<Comparative Example> As a comparative example, a laminated film having the following layer structure used for a packaging bag for roasted coffee beans was prepared, and a pillow packaging bag similar to that of Example 1 was used for each of the films. Make a package. Then, similarly, the roasted coffee beans were filled, the gas release property was checked, the backflow prevention property was checked by a sensory test, and the stiffness of the laminated film was obtained. The results are shown in Tables 1, 2, and 3. . However, in Comparative Example 1, the valve mechanism was not provided in the pillow packaging bag, and the roasted coffee beans were filled in the pillow packaging bag using a vacuum and gas filling packaging method. In Comparative Example 2, a conventionally used plastic pillow packaging bag with a molding valve was used. Comparative Example 1: PET 12 μm / DL / VMPET 12 μm
/ DL / LLDPE 40 μm Comparative Example 2: PET 12 μm / DL / VMPET 12 μm
/ DL / LLDPE 40 μm Comparative Example 3: Barrier ONY 15 μm / DL / VMPET1
2 μm / DL / LLDPE 40 μm Comparative Example 4: OPP 30 μm / DL / VMONY 15 μm
/ DL / LLDPE 40 μm Comparative Example 5: ONY 15 μm / DL / VMPET 12 μm
/ DL / LLDPE 30 μm Comparative Example 6: ONY 15 μm / DL / VMEVOH 12 μm
m / DL / LLDPE30 μm Here, PET is a polyester film, ONY is a biaxially stretched nylon film, OPP is a biaxially stretched polypropylene film, VMONY is a vapor-deposited biaxially stretched nylon film, and VMEVOH is a vapor-deposited ethylene / vinyl alcohol film. Polymer film (trade name, manufactured by Kuraray Co., Ltd.)
Eval VM-XL), and DL means that the adhesive is bonded by a dry lamination method using a urethane-based adhesive.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

Considering from Tables 1, 2 and 3, only Example 1 showed a good evaluation in both the gas release property and the sensory test. Comparative Examples 3, 4, and 6 had poor gas release properties. This is probably because the film was too stiff relative to the seal pattern used. In Comparative Example 5, the sensory test was not good. Although the stiffness of the film was almost the same as that of Example 1, it is considered that the film was originally inferior in gas barrier properties as a packaging material for coffee, so that the flavor was deteriorated. The difference in gas barrier properties is reflected in the evaluation of flavor. Further, in Comparative Example 1 in which a valve mechanism was not provided and a vacuum and gas filling method was employed, it can be seen that the pillow packaging bag expands as gas is generated with time.

[0027]

As described above, according to the present invention, since a fine unsealed portion is provided in the seal portion and the valve mechanism is built in the package itself as a valve mechanism, the valve mechanism is separately attached to the package. There is no need to obtain an inexpensive degassing package.

Also, when filling the package with raw miso and roasted coffee beans, etc., only a slight modification of the filling and packaging machine is required, and a new valve mounting device is added to the filling and packaging machine. Since it is not necessary to attach the device to the device, the number of steps can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of the present invention.

FIG. 2 is an explanatory plan view showing one embodiment of a seal portion of the present invention.

FIGS. 3A to 3C are plan explanatory views showing another embodiment of a seal portion.

FIGS. 4A and 4B are schematic explanatory views showing a sealed portion and an unsealed portion of a film.

[Explanation of symbols]

 10 {gas release package} 11} back seal part 12} bottom seal part 21} seal part 22 {unsealed part 23} sealed part 24 {unsealed part x} sealed part width y} Seal width z 幅 Unsealed width A ‥‥ A block B ‥‥ B block C ‥‥ C block D ‥‥ D block

Claims (2)

(57) [Claims] 1. A package in which a fine unsealed portion is provided in a seal portion of the package to form an air passage so that gas generated from stored items can be released, wherein the film forming the package has a strong stiffness. Saga, 0.5 ~
12.0 gf / 25 mm width, and the seal portion is composed of two dashed seal lines partially leaving an unsealed portion, and the unsealed portions of these two seal lines are shifted from each other. Characterized in that the two seal lines alternately have convex portions protruding in the direction facing each other. 2. The degassing package according to claim 1, wherein the innermost layer of the film forming the package is a film having a property of being in close contact with each other when superposed on each other.