JP4766751B2 - Shrink package - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, a container or the like containing a food such as noodles to improvements about the shrink package was shrink wrapping with heat-shrinkable film.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, containers containing instant food that can be poured with hot water, for example, are generally shrink-wrapped with a film having heat shrinkability. The film is preliminarily formed with deaeration holes before the heat shrinkage, and the air in the film is effectively released from the deaeration holes during the heat shrinkage, so that a good packaging state can be obtained. is there.
[0003]
[Problems to be solved by the invention]
However, there is a possibility that small insects may enter the film from the deaeration holes after packaging.
Therefore, for example, it may be considered that the deaeration holes are provided in one place and a tack label is attached and closed so as to cover the deaeration holes after packaging. However, for example, the method of heat shrinkage of the film differs depending on how hot air hits, etc., and the position of the deaeration holes after packaging varies between individuals, so it is possible to stick a tack label accurately at the position of the deaeration holes on the production line Have difficulty. Therefore, when sticking a tack label after packaging, it is necessary to enlarge the tack label more than necessary in view of the positional deviation of the deaeration holes, and there is a problem in terms of cost.
[0004]
In addition, as a measure against insects, shrink wrapping using a film having numerous micropores formed in the whole can be considered, but the use of a special film causes an increase in manufacturing cost.
[0005]
Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a low-cost shrink package that can prevent insects from entering through the deaeration as much as possible.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and the shrink package according to the present invention has a sheet piece attached so as to cover a deaeration hole formed to allow the air inside to escape to the outside during heat shrinkage. the heat-shrinkable film that is deposited, to be packaged such as foods are shrink wrapped, the sheet piece is composed of a fibrous sheet having air permeability such as a nonwoven fabric, on the back surface of the sheet piece, substantially the center Adhesive is applied to the peripheral part leaving the part, and this sheet piece is attached to the film so that the deaeration hole is located in the substantially central part remaining without being applied with the adhesive, and is located in the approximate central part. The uncoated portion of the adhesive is set larger than the size of the deaeration holes .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the shrink package of the present invention will be described with reference to the drawings.
The package shown in FIG. 1 is obtained by shrink-wrapping a container 1 containing food in a tension state with a film 2 having heat shrinkability.
[0009]
The container 1 includes a bottomed container body 3 having an opening on the upper surface, and a lid 4 that closes the opening. Inside the container 1, for example, an instant food that can be poured and poured with hot water is stored as an object to be stored. The container body 3 is formed by injection molding or the like of a synthetic resin. For example, polypropylene, polyethylene, polystyrene, foamed resins thereof, or paper is used. The lid 4 is formed by sheet molding such as high impact polystyrene, for example, and is configured to be fitted to the container body 3.
[0010]
The heat-shrinkable film 2 is made of, for example, a polypropylene biaxially stretched film having a thickness of 10 to 20 μm, and one round hole-like deaeration hole 5 is formed at a position corresponding to the approximate center of the lid 4. . This deaeration hole 5 is for releasing internal air to the outside at the time of heat shrinkage, and its size, shape, position, etc. are determined as appropriate depending on the size, shape, etc. of the package.
[0011]
Further, a tack label 6 as a sheet piece is stuck to the film 2 so as to cover the deaeration hole 5 from the outer surface side. The tack label 6 is affixed to the film 2 in advance before the film 2 is heat-shrinked, that is, in a pre-process before packaging. On the back surface of the tack label 6, an adhesive 7 (adhesive) is applied to the peripheral portion leaving a substantially central portion, and the deaeration hole 5 is located in a substantially central portion remaining without being applied with the adhesive 7. As shown in FIG. In other words, an uncoated portion (non-bonded portion) that can cover the deaeration holes 5 is formed in the substantially central portion of the back surface, and the coated portion is formed around the uncoated portion over the entire circumference. Further, the adhesive 7 is partially applied (part coat) to the back surface of the tack label 6. Of course, in consideration of the sticking error of the tack label 6, the area of the uncoated portion is set larger than that of the deaeration hole 5. The area of the uncoated part (venting part) is preferably 200 mm ² or more.
In FIG. 2 (a), the application portion of the adhesive 7 is represented by a cross hatch.
[0012]
The tack label 6 is composed of a breathable fibrous sheet so as to ensure the outflow of air from the deaeration holes 5 during heat shrinkage.
As the fibrous sheet, for example, a nonwoven fabric or a paper sheet can be used.
Specifically, pulp paper, polyester mixed paper, polyester, polypropylene and other short fibers and long fibers made by paper making method, spun bond method, melt blow method, etc. can be used. It is preferable that the air permeability measured in accordance with JISP8117 “Testing method for air permeability of paper and paperboard” is 0.5 sec / 100 cc to 0.05 sec / 100 cc. The sheet may have a multilayer structure as well as a single layer.
[0013]
Next, the manufacturing method of the shrink package which consists of the above structure is demonstrated.
As shown in FIG. 3, a long film 2 wound in a roll shape is set in a packaging machine, and degassing holes 5 are formed at predetermined intervals along the longitudinal direction by a perforating roller 10 in the fed film 2. To form. That is, one deaeration hole 5 is formed in the film 2 for each length necessary for packaging one container 1, and the tack label 6 is sequentially attached to the position where the deaeration hole 5 is formed at the downstream position. I will do it.
[0014]
Subsequently, the film 2 in which the tack label 6 is adhered to the deaeration hole 5 is formed into a cylindrical shape by the former 11, and both edges thereof are bonded by a vertical sealer 12 by heat sealing (melting sealing or the like). On the other hand, the container 1 in which the food is stored is conveyed in synchronization with the feeding of the film 2 with an interval in the cylindrical film 2. Further, the film 2 covering the container 1 is cut into an appropriate size by a seal cutter 13 (melting sealing device or the like), and the front and rear portions thereof are heat sealed.
[0015]
And the film 2 which coat | covers the container 1 is heat-shrinked with the hot air of the heating apparatus 14. FIG. At that time, since the tack label 6 has air permeability, the air in the film 2 can escape from the deaeration holes 5 through the tack label 6 to the outside during shrinkage.
Moreover, since the deaeration hole 5 is covered with the tack label 6 in the manufactured shrink package, the invasion of insects from the deaeration hole 5 is effectively prevented.
[0016]
Thus, by sticking the tack label 6 functioning as a filter to the film 2 in advance before shrinkage, it becomes easy to accurately stick to the position of the deaeration hole 5, and simple manufacturing equipment is sufficient. Moreover, since it is not necessary to enlarge the tack label 6 unnecessarily, the cost of the tack label 6 itself can be suppressed, and as a result, the shrink package can be manufactured at low cost.
[0017]
In addition, the tack label 6 stuck to the deaeration hole 5 can also be used as an opening means. As shown in FIG. 1, the one end 6 a of the tack label 6 is not adhered to the film 2 as an uncoated portion of the adhesive 7, and the degassing hole is formed by pulling the tack label 6 using the one end 6 a as a knob. The film 2 can be easily broken and opened from 5 as a starting point. In this case, it is preferable to apply the deaeration holes 5 as cuts of a substantially U shape, a substantially X shape, a substantially V shape or the like so that the film 2 is easily broken. Note that degassing is possible even with such a cut.
[0018]
Further, the deaeration holes 5 are not limited to one place. For example, as shown in FIG. 1, the deaeration holes 5 may be provided at a position on the bottom surface side to have a total of two places, and each may be covered with the tack label 6 described above. . In addition, a plurality of (for example, two) deaeration holes 5 may be formed in a nearby place, and the plurality of deaeration holes 5 may be collectively covered with one tack label 6.
Furthermore, you may use the film 2 which stuck the tack label 6 from the inner surface side.
[0019]
In addition, the degassing holes 5 are formed in the long film 2 and the tack label 6 is attached to the long film 2 and then formed into a cylindrical shape so as to cover the container 1. The tack label 6 may be pasted after the container 1 is coated using the long film 2 in which the degassing holes 5 are formed. In any case, by sticking the tack label 6 to the deaeration hole 5 before heat shrinkage, it can be accurately stuck with simple equipment. Alternatively, the film 2 having the tack label 6 attached to the position where the deaeration holes 5 are formed may be wound in a roll shape, and the roll-shaped film 2 may be directly set in a packaging machine for shrink packaging.
[0020]
In addition to packaging the container 1 as described above, for example, a solid food can be directly packaged with the film 2.
[0021]
【Example】
Since the applicant conducted a test on the present invention, it will be described in detail below.
Experimental example 1
A heat-shrinkable film made of polypropylene (trade name: Polyset, manufactured by Kojin Co., Ltd.) (thickness 15 μm) is provided with a 10 mm diameter round hole-shaped deaeration hole, and 30 mm × 30 mm made of nonwoven fabric (polyester mixed paper). A tuck label of the size was affixed. The air permeability of the nonwoven fabric was 0.13 sec / 100 cc. An uncoated part (non-adhered part) having a diameter of 20 mm was formed in the center of the tack label.
The cup ramen (trade name: Cup Noodle, manufactured by Nissin Foods Co., Ltd.) is covered with the heat-shrinkable film with the tack label, and the surroundings are fused and sealed, and then heated with a hot air heater at 155 ° C. for 10 seconds. Was good.
Experimental example 2
Experiments were conducted in the same manner as in Experimental Example 1 except that the nonwoven fabric used for the tack label in Experimental Example 1 was replaced with a non-woven fabric having an air permeability of 0.35 seconds / 100 cc. Although the shrinkage was slightly insufficient, the finish was almost good.
Experimental example 3
The experiment was conducted by changing the shape of the deaeration hole of Experimental Example 1 to a substantially X-shaped cut (10 mm square). Good finish similar to Experimental Example 1 was obtained.
[0022]
【The invention's effect】
As described above, since a breathable sheet piece is attached to the film before heat shrinkage so as to cover the deaeration holes, it is possible to achieve both the effect of air release during heat shrinkage and the effect of preventing insect invasion after packaging and is inexpensive. Can be manufactured.
[Brief description of the drawings]
FIG. 1 is a perspective view including a partially broken line showing a shrink package in one embodiment of the present invention.
FIG. 2 shows a main part of the package, (A) is a plan view, and (B) is a cross-sectional view along P-P in (A).
FIG. 3 shows an outline of a manufacturing process of the shrink package, wherein (A) is an overall configuration diagram, and (B) is an enlarged perspective view of a main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container (packaged object), 2 ... Film, 5 ... Deaeration hole, 6 ... Tack label, 7 ... Adhesive

Claims (2)

A food shrinkable film (2) to which a sheet piece (6) is attached so as to cover a deaeration hole (5) formed to release the air inside to the outside at the time of heat shrinkage, and to be packaged such as food The sheet piece (6) is made of a fibrous sheet having air permeability such as a nonwoven fabric ,
On the back surface of the sheet piece (6), the adhesive (7) is applied to the peripheral portion, leaving a substantially central portion, and the sheet piece (6) has a substantially center left without being applied with the adhesive (7). Attached to the film (2) so that the deaeration hole (5) is located in the part, the uncoated part of the adhesive (7) located in the substantially central part is set larger than the size of the deaeration hole (5) A shrink package characterized in that The fibrous sheet constituting the sheet piece (6) has an air permeability measured according to JISP 8117 “Paper and board air permeability test method” of 0.5 sec / 100 cc to 0.05 sec / 100 cc. Item 12. A shrink package according to item 1 .

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