JP2005239172A - Heat shrinkable packaging body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat shrinkable packaging body having excellent appearance and excellent sealability without causing any burn or large corners. <P>SOLUTION: In a heat shrinkable packaging body 10 which covers an object 20 to be covered with a heat-shrinkable film 1 and is heat-shrunk after providing a center seal part 2 in which both ends of a heat shrinkable film 1 overlap face to face and are heat-sealed, and front and rear seal parts 3. The shrinkable packaging body 10 comprises a heat seal part 5 subjected to discontinuous seal having a non-fused part 4 for discharging air with the center seal part 2 provided on the inner side of the packaging body, and a blocking part 7 fused via a blocking promoting agent coated so as to form a non-coating part 6 provided on the outer side of the packaging body and capable of discharging air. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shrink wrapping body using a heat-shrinkable film, and particularly relates to a shrink wrapping body excellent in sealing performance.

  2. Description of the Related Art Conventionally, shrink wrapping is widely used in which an object to be packaged such as food is coated and sealed with a heat-shrinkable film and then hot air or the like is blown to heat-shrink the heat-shrinkable film and adhere to the object to be packaged. By the way, in the case where an object to be packaged is entirely packaged with a heat-shrinkable film, it is necessary to open several small holes in advance for discharging the air inside the package to the outside when the film shrinks.

  However, when a small hole is previously formed in the heat-shrinkable film, the small hole expands due to the shrinkage stress at the time of heat shrinkage, resulting in poor appearance, and in some cases, the film is broken. In addition, foreign substances such as dust and insects enter the package from the small holes, leading to contamination of the package, and air and moisture can easily enter the package. There were also problems such as discoloration and decay.

In order to solve such a problem, for example, in Patent Document 1, a part or all of a joint is formed as a double or triple or more line-like joint with an appropriate interval, and adjacent to this joint. By aligning the joints with each other and providing an unjoined part, the internal air is released through the unjoined part and the inner and outer joints when shrinking, and both the inner and outer joints shrink after the shrinkage is completed. Patent Document 2 describes almost the same content of a package that adheres by action and blocks ventilation. Further, in Patent Document 3, a blocking accelerator is applied to a part between the envelope-pile-like overlaps, and the non-applied part penetrates the inside and outside of the package. It is described that the air in the body is first discharged from an uncoated part of the blocking accelerator, and then blocked and sealed in the uncoated part of the blocking accelerator.
However, in these methods, the unjoined portion or the unapplied portion of the blocking accelerator satisfies both the function of discharging the air inside the package during shrinkage and the function of preventing the inflow of air, moisture and the like after shrinkage. For example, if air can be easily discharged for the purpose of improving the packaging finish, the inflow prevention effect of air and moisture after shrinkage will decrease, and the unjoined part will increase the inflow prevention effect. If the number of unapplied parts is reduced, the air is not smoothly discharged, so that there is a problem in that the finish of the packaging is deteriorated due to burns or so-called corners of residual shrinkage.

Microfilm of Japanese Utility Model No. 54-79578 (Japanese Utility Model Publication No. 55-179108) JP-A-4-31261 Patent No. 2992125

  This invention is made | formed in view of the said problem, and makes it a subject to provide the shrink wrapping body which was excellent also in the sealing property while having the outstanding external appearance, without being burned and a big corner | angular.

  As a result of intensive studies, the inventors of the present invention have made the center seal part a double structure, and a blocking accelerator further inside the tunnel on the tip side of the heat seal part provided with a discontinuous seal having a conventionally known non-fused part. The present inventors have found that a shrink wrapping body in which the above-mentioned problems are solved can be obtained by providing a blocking portion that is fused via the present invention.

That is, according to the present invention,
(1) The object to be packaged 20 is covered with the heat-shrinkable film 1, and the heat-shrinkable film is provided after the center seal portion 2 and the front and rear seal portions 3 formed by overlapping both ends of the heat-shrinkable film 1 in the shape of a palm. In the shrink-wrapped package 10, the center seal portion 2 is provided on the inner side of the package body, and the heat seal portion 5 is provided with the discontinuous seal having the non-fused portion 4 for discharging air, and on the outer side of the package body. A shrinkable wrapping body 10 comprising a blocking portion 7 that is fused via a blocking accelerator that is provided so as to form a non-application portion 6 that is provided and capable of discharging air.
(2) The proportion of the non-fused portion 4 in the heat seal portion 5 subjected to the discontinuous seal is larger than the proportion of the non-application portion 6 in the blocking portion 7 described in (1) Shrink wrap 10.
(3) The shrink wrapping body 10 according to (1) or (2), wherein an antiblocking agent is applied to the non-fused portion 4 is provided.

  The shrink wrapping body of the present invention can take the non-fused portion 4 of the center seal portion 2 wider so that air can be smoothly discharged from the inside of the wrapping body during shrink wrapping. Not only can packaging be performed, but also the packaging speed can be increased. Further, since the blocking portion 7 provided at the front end side of the center seal portion 2 exists, not only can the dust and insects enter from the outside even if the non-fused portion 4 is somewhat wide, but also the intrusion of air and moisture. Has the effect of preventing it to some extent.

  Furthermore, since the non-application part 6 of the blocking part 7 can also be expected to be blocked by the shrinkage of the heat-shrinkable film 1, the sealing performance of the package can be further improved.

Hereinafter, the shrink wrap 10 of the present invention will be described in detail based on the drawings.
FIG. 1 is a schematic perspective view showing an example of the shrink wrap 10 of the present invention. As is apparent from FIG. 1, the shrink-wrap package 10 of the present invention is a center formed by covering a package 20 with a heat-shrinkable film 1 and then heat-sealing both ends of the heat-shrinkable film 1 in the shape of a palm. It has a seal portion 2 and front and rear seal portions 3.

  Here, the center seal portion 2 in the shrink wrapping body 10 of the present invention is a heat seal provided with a discontinuous seal having an air discharge non-fused portion 4 provided on the inside of the wrapping body as shown in FIG. A double structure of the part 5 and a blocking part 7 fused via a blocking accelerator applied so as to form a non-applied part 6 provided on the outer side of the package and capable of discharging air is formed. It is configured. In other words, the air inside the package first passes through the heat seal portion 5 of the center seal portion 2 and then passes through the blocking portion 7.

  Here, the shape of the discontinuous seal and the shape of the non-fused portion 4 are not particularly limited. For example, a seal is formed at regular intervals as shown in FIG. What is necessary is just to give a discontinuous seal as shown to 3 (C). As a method for forming such a discontinuous seal, (a) a method of performing heat sealing using a heater roller provided with irregularities alternately in stripes or oblique stripes, is generally used. Depending on the type and melting point of the adhesive film, for example, (b) a method in which an antiblocking agent is applied at an appropriate interval so that a portion where the antiblocking agent is applied is used as the non-fused portion 5 even when continuous sealing is applied. (C) A blocking accelerator is partially applied and continuously sealed at a low temperature not higher than the melting point of the heat-shrinkable film 1 so that the portion where the blocking accelerator is applied is fused to remove the non-coated portion. A method for forming the fused portion 4 is also possible, but there is no particular limitation.

  In the shrink wrap 10 of the present invention, the non-fused portion 4 in the heat seal portion 5 of the center seal portion 2 formed by the above method serves as a discharge port for discharging the air inside the wrapping body during shrink wrap. Yes. And the more the proportion of the non-fused portion 4 in the heat seal portion 5 is, the more smoothly the air can be discharged. Furthermore, it is more preferable that an anti-blocking agent is applied to the non-fused portion 4 because it is possible to prevent the non-fused portion 4 from blocking during the shrink wrapping process and making it difficult to discharge air. As the anti-blocking agent, a resin composition such as a silicon resin, an acrylic resin used as an ink medium, or the like is preferably used.

Further, the blocking portion 7 provided on the outer side of the package of the center seal portion 2 is applied so that a non-application portion 6 capable of discharging air inside the package is formed on one of the films as shown in FIG. The films are fused with each other through the blocking accelerator.
Although it does not specifically limit as a blocking promoter, The part coat agent conventionally used in order to provide heat sealing property can be used. For example, heat seal varnish, chlorinated polyethylene, chlorinated polypropylene, ethylene-vinyl acetate copolymer, or an appropriate mixture thereof is preferably used. Examples of the method for applying the blocking accelerator include a roll method and a spray method. Further, the application shape is not particularly limited as long as the non-application part 6 capable of discharging air is formed.

  There is a possibility that the film where the blocking accelerator in the blocking part 7 is applied may be fused before the exhaust of the air inside the packaging bag is completed, but it is completely fused because it is in a heated state. Furthermore, since the non-application part 7 exists as shown in FIG. 4A, the discharge of air is not hindered. In addition, after forming the package, the blocking accelerator is cooled and re-solidified, and the heat shrinkable film 1 contracts to close the portion corresponding to the non-application portion 6, so that the air inside the package is exhausted. Even if the proportion of the non-fused portion 4 provided in the center seal portion 2 is increased or the anti-blocking agent is applied, the package can be completely sealed. is there. For this purpose, as shown in FIG. 4, the proportion of the non-fused portion 4 in the heat seal portion 5 subjected to discontinuous sealing is made larger than the proportion of the non-application portion 6 in the blocking portion 7. It is preferable.

  In the shrink wrapping body of the present invention, since air is discharged during shrinkage from the non-fused portion 4 provided in the center seal portion 2, it is not necessary to provide small holes on the entire surface of the film that has been conventionally required. Further, after shrink wrapping, the films are fused with each other through the blocking accelerator of the blocking portion 7, so that moisture, dust, insects and the like do not enter from the outside, and the storability of the package is further improved. Moreover, since the air inside the package can be smoothly discharged as compared with a package in which the conventionally known non-fused portion 4 is simply provided in the center seal portion 2, it is possible to provide a shrink-wrapped package 10 having a beautiful packaging finish. It has become possible. Furthermore, the conventional packaging machine can be used without using any special equipment for producing the shrink-wrapped body of the present invention, and it is economical because it is not necessary to introduce a new packaging machine. It also has advantages.

It is a schematic perspective view which shows an example of the shrink-wrapping body 10 of this invention. It is explanatory sectional drawing which shows the structure of the superposition when forming the center seal | sticker part 2 in this invention. It is explanatory plan view (A), (B), (C) explaining the shape of the discontinuous seal in the center seal | sticker part 2. FIG. It is the schematic plan view (A) explaining the structure of the center seal | sticker part 2 of the shrink wrapping body 10 of this invention, and the fragmentary sectional view of the XY line vicinity (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shrink package 1 Heat-shrinkable film 2 Center seal part 3 Front-and-rear seal part 4 Non-fusion part 5 Heat seal part 6 Blocking accelerator non-application part 7 Blocking part 20

Claims (3)

The object to be packaged 20 is covered with the heat-shrinkable film 1, and the heat-shrinkable film 1 is heat-shrinked after the center seal portion 2 and the front and rear seal portions 3 formed by overlapping both ends of the heat-shrinkable film 1 in the shape of a palm. In the shrink wrapping body 10, the center seal portion 2 is provided on the inside of the wrapping body and the heat sealing portion 5 is provided with a discontinuous seal having a non-fused portion 4 for discharging air, and the air is provided on the outside of the wrapping body. A shrinkable wrapping body 10 comprising a blocking portion 7 fused with a blocking accelerator applied so as to form a non-applied portion 6 that can be discharged. The shrink-wrap package according to claim 1, wherein the proportion of the non-fused portion 4 in the heat seal portion 5 provided with the discontinuous seal is larger than the proportion of the non-application portion 6 in the blocking portion 7. 10. The shrink wrapping body according to claim 1, wherein an anti-blocking agent is applied to the non-fused portion 4.

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