JPH09255029A - Shrink-wrapped package and method for producing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop up the degassing hole so as to prevent entry of insects etc., into the inside of the film to the best of possibility and in a manner of freeing the package of inconvenience of an overlap by turning over the two overlapped parts, formed by joining parts meeting along a common edge, jointly on the packaging film and making them adhere together. SOLUTION: In this skunk-wrapped package the object for packaging is covered with a film 7 which is shrinkable under heat and has degassing holes 10 and the two overlapping parts 7c, 7d on the two sides respectively of the film 7 adhere together in a manner of having the back of one on the back of the other. In this instance a plurality of degassing holes 10 are provided close to the overlapping part 7c on one side and along the two overlapping parts 7c, 7d and the overlapping part 7c on the one side adheres to the film 7 in a manner of stopping up the degassing holes 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink wrapping body formed by wrapping an object to be stored such as food with a film having heat shrinkability, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, for example, instant foods that can be eaten by pouring hot water are generally shrink-wrapped in a container having a heat-shrinkable film. In this film, a plurality of deaeration holes are formed at arbitrary positions, and when the film is heated and contracted, the air in the film is effectively escaped to the outside, and the film is designed to adhere to the surface of the container.

Moreover, the above-mentioned package is often in the form of a so-called "season-sealed" pillow package in which the back surfaces of both polymerized portions on both sides of the film are adhered so as to polymerize with each other.

[0004]

When a food having a deaeration hole is used to package food, impurities such as dust are mixed into the film through the deaeration hole, and the odor of the contents leaks to the outside. Then, the odor may invite the insects to enter the film, which is not preferable.

Moreover, since both polymerized portions of the film are bonded together, there is a drawback that both polymerized portions interfere with the appearance of the packaging form.

The present invention has been made in view of the above-mentioned problems of the prior art, and by closing both depolymerization portions produced by the joint bonding and adhering them to the film side, the deaeration holes are blocked and the insects and the like are prevented from entering the film. Intrusion can be prevented as much as possible,
It is an object to prevent both overlapping portions from interfering with each other.

[0007]

The present invention has been made as a shrink wrap and a method for manufacturing the same in order to solve the above-mentioned problems. The feature of the shrink wrap is that the object to be wrapped has heat shrinkability. And covered with a film 7 having deaeration holes 10, and both polymerized portions 7c and 7d on both sides of the film 7
In the shrink package adhered so that the back surfaces of each other are superposed, a plurality of the deaeration holes 10 are provided in the vicinity of the superposed portion 7c on one side and along the both superposed portions 7c, 7d, and The overlapping portion 7c on the side is adhered to the film 7 so as to close the deaeration hole 10.

A feature of the method of manufacturing the shrink package is that the object to be housed is covered with a heat-shrinkable film 7, and both backsides of the polymerized portions 7c and 7d on both sides of the film 7 are polymerized. Degassing holes formed in the film 7 when the film 7 is shrunk by heating.
The air in the film 7 is released to the outside through the film 10, and the polymerized portion 7c on one side is adhered to the film 7 so that the degassing hole 10 is closed by the polymerized portion 7c.

Further, before the film 7 is heated, the heat-sensitive adhesive 11 is applied to at least one of the polymerized portion 7c of the film 7 and the film 7 to activate the heat-sensitive adhesive 11 when the film 7 is heated. Is preferred.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the package of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a pillow packaging type food package, which includes a container 3 having an opening 2 on an upper surface thereof, a lid 5 for closing the opening 2, the container 3 and the lid 5. The heat-shrinkable film 7 is shrink-wrapped in a tension state.

The container 3 is made of a foamed resin material such as a foamed polystyrene material, and contains, as an object to be stored, an instant food that can be eaten by pouring hot water, for example. The lid 5 is made of a sheet body on which aluminum foil having a barrier property against water vapor and oxygen is laminated on the entire surface, and the outer peripheral edge portion thereof is hermetically and peelably fixed to the upper edge portion of the peripheral side wall 3a of the container 3. ing.

The heat-shrinkable film 7 is made of, for example, a polypropylene film having an excellent water vapor barrier property. Both ends 7a, 7b of the film 7 located on the top and bottom surfaces of the container 3 are heat-sealed in the diametrical direction of the container 3, and the polymerized portions 7c, 7d heat-sealed in the longitudinal direction of the container 3 have their back surfaces. It is a so-called joint sticking, in which the two are glued together.

Numeral 10 indicates that when the film 7 covering the container 3 is heat-shrinked, the air in the film 7 is released to release the film 7.
Is a deaeration hole formed in the film 7 in order to improve the contracted state of. A plurality of deaeration holes 10 are provided in the vicinity of the overlapping portion 7c on one side (non-overlapping portion) and along the vertical direction of the container 3 (longitudinal direction of the overlapping portion 7c). That is,
The degassing holes 10 are continuously provided in three rows so as to be located from the top surface to the bottom surface of the container 3, and the number and size thereof are appropriately determined. For example, the diameter is 0.5 to 2 mm and 5
A pitch of ~ 30 mm is preferred.

The length L of the overlapping portions 7c and 7d is determined by
When 7c and 7d are bent toward the deaeration hole 10 side, they are provided with a length long enough to close the deaeration hole 10,
7c is adhered to one side of the heat-shrinkable film 7 integrally with the overlapping portion 7d on the other side via the heat-sensitive adhesive 11. The heat-sensitive adhesive 11 is continuously provided over the entire length of the surface of one polymerized portion 7c, and the polymerized portion 7c and the contact portion of the polymerized portion 7c of the film 7 are substantially adhered to each other, and the deaeration hole is formed. 10 is closed.

The package of the present embodiment has the above-mentioned structure, and the manufacturing method thereof will be described below. First,
The heat-shrinkable film 7 has a long shape and is wound in a roll shape as shown in FIG. 3B, and the heat-sensitive adhesive is attached to one edge of the surface of the long-shaped film 7. The agent 11 is continuously applied in the longitudinal direction of the film.

Next, as shown in FIG. 1 (a), the roll-shaped heat-shrinkable film 7 set in the pillow packaging machine is fed out, and the deaeration hole 10 is formed on one side of the film 7 by a perforating roll 20. It is formed continuously in three rows and is formed into a tubular shape by the former 15, and the overlapping portions on both sides in the width direction are formed.
Heat seal 7c and 7d with vertical sealer 16. on the other hand,
A plurality of containers 3 containing food and closed by a lid 5 are placed in a film 7 formed into a tubular shape with a space therebetween.
The film 7 is conveyed in synchronization with the feeding.

Further, the front and rear parts of the film 7 for covering the container 3 are heat-fused and sealed by a seal cutter 16 at the front and rear parts. At the time of sealing the front and rear parts, it is preferable to seal both longitudinal ends of the overlapping portions 7c and 7d so that the overlapping portions 7c and 7d can be bent to one side of the film.

Next, when the film 7 covering the container 3 is heated by the hot air of the heating device 17, the heated film 7
Contracts, and the air inside escapes from the deaeration holes 10 to the outside, so that the film 7 adheres to the surface of the container 3 and the tension of the film 7 causes the overlapping portions 7c and 7d to be separated from each other.
Stick to the side.

Since the heat-sensitive adhesive 11 is applied to one surface of the film 7, the heat-sensitive adhesive 11 is activated by the hot air of the heating device 17 and has adhesiveness.
At 11, the both polymerized portions 7c and 7d are adhered to the film 7. Therefore, the deaeration hole 10 is closed to be in a substantially sealed state, and there is almost no possibility that the odor of food leaks to the outside, insects or the like enter the film, and there is also a moisture-proof effect.

Moreover, since the packaging body completely closes the degassing holes 10 by utilizing the inevitably generated overlapping portions 7c and 7d,
There is no need for another separate tape for blocking. Even if the length L of the overlapping portions 7c and 7d is long, the overlapping portion
Since 7c and 7d are adhered to one side of the film 7, there is no obstruction and there is no need to cut them, and moreover, sufficient sealing strength between the overlapping portions 7c and 7d can be secured.

In the above embodiment, the case where the deaeration holes 10 are formed only in the vicinity of the overlapping portions 7c and 7d has been exemplified, but a single or a small number of auxiliary holes may be provided at an arbitrary position different from the deaeration holes 10. The deaeration hole 11 may be formed so that air can be released more quickly. In such a case, the auxiliary deaeration holes 11 can be made as small in diameter as possible, or because the number of the deaeration holes is singular or small, compared to the case where all the deaeration holes are not closed as in the conventional case,
Opportunity for insects to enter is reduced.

The auxiliary deaeration hole 11 may be closed by attaching a label 13 to the film 7 after the film 7 is shrunk. In such a case, the work of attaching the label 13 is required, but since the deaeration hole 10 is closed by the overlapping portions 7c and 7d, a small label 13 is sufficient, and the label 13 can be easily attached. Becomes

Moreover, although the heat-sensitive adhesive 11 is applied to the overlapped portion 7c side, it may be applied to the portion of the film 7 to which the overlapped portion 7c is adhered. Further, in the above-described embodiment, the heat-sensitive adhesive 11 is applied to the roll-shaped film 7 in advance, but the film 7 is applied to the vertical sealer 16 of the pillow packaging machine.
Alternatively, it may be applied immediately after sealing.

Needless to say, the means for adhering the polymerized portions 7c and 7d of the film 7 may be adhered via an adhesive instead of heat sealing.

Further, the packaging form of the package is not limited to the above-mentioned one, and it can also be used when a solid food is directly packaged by the film 7 as shown in FIG. 4, for example.

[0026]

As described above, according to the present invention, the deaeration holes are provided in the vicinity of the polymerization portion on one side and along the both polymerization portions, and the polymerization portion on one side closes the deaeration holes. Therefore, since it is adhered to the film, it is possible to obtain an insect-proof effect that insects and the like can be prevented from entering the film through the deaeration holes as much as possible. Moreover, since the overlapped portion maintains the bent state, the overlapped portion can be effectively used without obstructing or cutting, and the appearance can be improved.

Before the film is heated, a heat-sensitive adhesive is applied to at least one of the polymerized portion of the film and the film, and the heat-sensitive adhesive is activated when the film is heated. At the same time as heating, the heat-sensitive adhesive is also activated, and both polymerized parts can be bonded to the film side by the heat-sensitive adhesive, which has the advantage that a series of packaging operations by the packaging machine can be performed quickly.

[Brief description of drawings]

FIG. 1 is a perspective view including a partial cross section showing an embodiment of the present invention.

FIG. 2A is a cross-sectional view of a main part before the film shrinks, and FIG. 2B is a cross-sectional view of the main part after the film shrinks.

FIG. 3 shows an embodiment of a method for manufacturing a shrink package according to the present invention, in which (a) is a schematic front view showing a packaging step,
(B) is a perspective view of the heat-shrinkable film wound in a roll shape.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

3 ... Container, 7 ... Film, 7c, 7d ... Polymerization part, 10 ... Degassing hole, 11 ... Heat-sensitive adhesive

Claims (3)

[Claims] 1. A packaged object is covered with a film (7) having heat shrinkability and having deaeration holes (10), and both polymerized parts (7c, 7d) on both sides of the film (7) are mutually covered. In the shrink package adhered so that the back surface of the polymerize, the deaeration holes (10) are provided in the vicinity of the polymerized part (7c) on one side and along the both polymerized parts (7c, 7d), Moreover, the shrink wrapping body characterized in that the overlapping portion (7c) on the one side is adhered to the film (7) so as to close the deaeration hole (10). 2. An object to be stored is covered with a film (7) having heat shrinkability, and both polymerized parts (7c, 7d) on both sides of the film (7) are bonded so that their back surfaces are polymerized. Further, when the film (7) is heated and contracted, the air in the film (7) is released to the outside through the deaeration holes (10) formed in the film (7), and the polymerized portion on one side is released. (7c)
The polymerized part (7
A method for manufacturing a shrink package, which comprises closing the deaeration hole (10) in step c). 3. A heat-sensitive adhesive (11) is applied to at least one of the polymerized part (3c) and the film (7) of the film (7) before heating the film (7), and the film (7). The method for producing a shrink package according to claim 2, wherein the heat-sensitive adhesive (11) is activated at the time of heating.