JP6333669B2 - Packaging method - Google Patents

Description

  The present invention relates to a shaped resin film continuous body suitably used for packaging a packaging object such as food and a packaging method using the same.

  Conventionally, fresh foods such as meat and fish, cooked prepared dishes, etc., are often placed on a tray made of foamed resin, etc., wrapped with a transparent resin film, and sold at retail stores. However, recently, from the viewpoint of reducing waste, non-tray packaging for packaging food without using a tray is spreading.

  As a packaging apparatus for non-tray packaging, for example, as described in Patent Documents 1 and 2, a plurality of storage units are continuously formed on a resin film that is unwound from a raw roll and transported in a horizontal direction. There is an apparatus provided with a molding mechanism that performs sealing, and a sealing mechanism that covers and seals a storage portion in which a packaging object such as fresh food is stored so as to close the opening.

JP 2002-145215 A JP 2007-189995 A

  However, the packaging using such a packaging apparatus has a problem in terms of productivity because the packaging processing speed is slow.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the packaging method which can perform non-tray packaging at a high packaging processing speed, and the shaping resin film continuous body used for this.

The present invention has the following configuration.
[1] A load comprising a long shaped resin film in which a plurality of concave storage portions for storing a packaging object are formed, and the storage portion is wound or folded in a compressed state. Shaped resin film continuum.
[2] A storage step of storing a packaging object in the storage part of the shaped resin film drawn out from the continuous shaped resin film continuous body according to [1], and after the packaging object is stored And a sealing step of sealing the lid film to the shaped resin film so as to close the opening of the storage portion.
[3] The packaging method according to [2], further including a developing step of developing the storage portion of the shaped resin film that has been fed out during or before the storing step.

  ADVANTAGE OF THE INVENTION According to this invention, the packaging method which can perform non-tray packaging at a high packaging processing speed, and the shaping resin film continuous body used for this can be provided.

It is a perspective view which shows an example (winding body) of the shaping resin film continuous body of this invention. It is a perspective view which shows another example (folded body) of the shaping resin film continuous body of this invention. It is explanatory drawing explaining an example of the manufacturing method of the shaping resin film continuous body of FIG. It is explanatory drawing explaining the principal part about the other manufacturing method of the shaping resin film continuous body of FIG. It is explanatory drawing which shows an example of the packaging method of this invention.

Hereinafter, the present invention will be described in detail.
<Continuous shaped resin film>
As the shaped resin film continuous body of the present invention, a shaped resin film wound body in which a long shaped resin film is wound in a roll shape, a long shaped resin film is folded into a bellows shape, etc. A shaped resin film folded body is mentioned.

  FIG. 1 is a perspective view showing an example of a shaped resin film wound body (hereinafter, also simply referred to as a “wound body”) 10A. The wound body 10A of this example includes a long shaped resin film 11 in which a plurality of concave storage portions 12 in which a packaging object is stored are formed, and each of the plurality of storage portions 12 is crushed or folded. It has been wound in a compressed state. FIG. 1 shows a state in which the one end 11a side in the longitudinal direction of the shaped resin film 11 is slightly extended.

The storage portion 12 is formed in a concave shape by a known molding method, and in this example, is formed in two rows in the width direction of the shaped resin film 11, and in each row, the length of the shaped resin film 11 is Many are formed at equal intervals along the direction. Examples of the forming method include known film forming methods such as vacuum forming, pressure forming, and press forming. As described later, the vacuum forming method includes a plug assist method using a plug together with a female die.
In the wound body 10A of this example, the shaped resin film 11 is wound in a roll shape so that the opening 12a side of each storage portion 12 is the outside and the bottom 12b side is the inside.

  The shaped resin film 11 may have a single layer structure or a multilayer structure, and a resin film having a single layer structure or a multilayer structure can be used as the material thereof. Examples of the raw material for each layer include polyolefin resins such as polyethylene (PE) and polypropylene (PP), and resins such as polyamide (PA) and ethylene vinyl alcohol copolymer (EVOH). Each layer may be formed from one of these resins or may be formed from a blend of two or more.

  Although there is no restriction | limiting in particular as a concrete structure of the shaping resin film 11, When the film for lid | covers mentioned later is sealed by heat seal, the surface of the side sealed by the film for lid | covers is heat-sealability. It is preferable that it consists of PE, PP, etc. which are excellent in. More specifically, from the viewpoint of such heat sealing properties, gas / water vapor barrier properties, moldability of the housing portion 12, etc., a three-layer film such as PE / PA / PE, PE / EVOH / PA / A four-layer film such as PE is preferred. An adhesive layer may be provided between the layers as necessary.

  As thickness of the shaping resin film 11, 50-500 micrometers is preferable as thickness of parts other than the accommodating part 12, and 100-300 micrometers is more preferable. When the thickness is equal to or greater than the lower limit of the above range, the bottom and corners of the storage portion 12 have sufficient thickness and are excellent in strength. When it is not more than the upper limit of the above range, the moldability of the storage portion 12 is excellent. The thickness of parts other than the storage part 12 is equivalent to the thickness of the resin film which is the material.

The shaped resin film roll 10A of FIG. 1 can be manufactured as follows.
First, as shown in FIG. 3, for example, a raw fabric roll 21 around which a resin film 20 having a layer structure as described above (for example, PE / PA / PE, PE / EVOH / PA / PE, etc.) is wound is prepared. Then, the resin film 20 is unwound from the raw roll 21 and transported horizontally, and the storage unit 12 as shown in FIG. 1 is continuously formed on the resin film 20 by the molding device 30. The molding apparatus 30 in this example is a plug assist type vacuum molding apparatus having a female mold 31 positioned below the horizontally transported resin film 20 and a plug 32 positioned above the resin film 20. The concave storage portion 12 is formed by operating the suction mechanism (not shown) provided in the above to bring the resin film 20 into close contact with the surface of the female die 31 and lowering the plug 32 to press the resin film 20 from above. It can be done.
In FIG. 3, only one pair of the female mold 31 and the plug 32 is illustrated, but the wound body 10 </ b> A in FIG. 1 has the storage portions 12 formed in two rows in the width direction of the shaped resin film 11. Therefore, the actual molding apparatus 30 in this example has two pairs of female molds 31 and plugs 32.
Before the storage unit 12 is molded by the molding apparatus 30, the resin film 20 is usually preheated with a heater (not shown).

Next, the resin film after the storage portion 12 is formed, that is, the shaped resin film 11 is wound up by the winding roll 40. By winding in this way, the shaped resin film 11 is wound while the storage portions 12 are crushed and compressed, and the shaped resin film wound body 10A of FIG. 1 is obtained.
In this example, since the winding is performed so that the opening 12a side of each storage unit 12 is on the outside and the bottom 12b side is on the inside, at the time of winding, The heading force acts and the storage portion 12 is more effectively compressed.

  Further, as in the example of FIG. 3, a pair of sandwiching rolls 50 a and 50 b that sandwich the shaped resin film 11 is provided as a compression mechanism for compressing the storage unit 12 upstream of the take-up roll 40, and the shaped resin The storage unit 12 may be more effectively compressed by passing the film 11 between the sandwiching rolls 50a and 50b. Moreover, as shown in FIG. 4, as a compression mechanism, a pair of pressing plates 60a and 60b are arranged above and below the horizontally-shaped shaped resin film 11 so that the storage portion 12 is sandwiched and compressed. You may make it do. A pair of clamping rolls 50a and 50b and a pair of pressing plates 60a and 60b may be used in combination in the compression mechanism.

The shaped resin film folded body (hereinafter, also simply referred to as “folded body”) 10B of FIG. 2 is a long shaped resin film 11 in which a plurality of storage portions 12 in which packaging objects are stored are formed. 1 is different from the wound body 10A of FIG. 1 in that the storage unit 12 is not wound in a compressed state but is folded in a bellows shape in a compressed state.
The storage portions 12 of the folded body 10B of this example are formed in two rows in the width direction of the shaped resin film 11 by a known molding method, similarly to the wound body 10A of FIG. Many are formed at equal intervals along the longitudinal direction of the shaped resin film 11. In this example, for each of the three storage portions 12 in the longitudinal direction, the fold and valley folds are repeated along the width direction with respect to the shaped resin film 11, so that the shaped resin film 11 has a bellows shape. Folded and stacked.

  In the case of manufacturing the shaped resin film folded body 10B of FIG. 2, first, as in the production of the shaped resin film roll 10A, for example, the layer configuration as described above (for example, PE / PA / PE, PE / EVOH / PA / PE etc.) is prepared, and a raw film roll is prepared. The resin film is unwound from the original roll, and is transported horizontally to the molding apparatus. Mold continuously. Thereafter, the shaped resin film 11 on which the storage portion 12 is formed is not wound, but is folded by a not-shown film folding machine or the like to obtain the shaped resin film folded body 10B of FIG.

  Before folding the shaped resin film 11 on which the storage part 12 is formed, the storage part is formed by a compression mechanism or the like including at least one of the pair of sandwiching rolls 50a and 50b and the pair of pressing plates 60a and 60b as described above. 12 may be compressed.

<Packaging method>
Next, at the site of packaging fresh food, side dishes, etc., such as at a retail store backyard, the object to be packaged (fresh food, side dishes, etc.) using the wound body 10A of FIG. ) Will be described.
First, as shown in FIG. 5, the shaped resin film 11 is unwound from the shaped resin film roll 10A of FIG. At this time, the shaped resin film 11 is horizontally conveyed so that the opening 12a of the storage unit 12 faces upward. In addition, you may process the feed hole etc. which are not illustrated in the edge part of the width direction of the shaping resin film 11 so that horizontal conveyance may be easy here.
Next, the packaging object C is placed and stored in the storage portion 12 of the shaped resin film 11 that is horizontally conveyed by an operator manually or by an automatic storage mechanism (not shown) (storage process).

Here, when the packaging object C has a certain amount of mass, the storage unit 12 in a compressed state naturally expands downward due to its own weight. In addition, it is not necessary to separately perform a process for expanding the storage portion 12. However, when the packaging object C is lightweight, it is preferable to separately perform an unfolding step of unfolding the storage portion 12 of the drawn shaped resin film 11.
Examples of the expanding step include a step of blowing a high-pressure gas such as compressed air from the opening 12a to the storage portion 12, a step of sucking the bottom portion 12b of the storage portion 12 downward with a decompression device, and the like.
Such a development process may be performed simultaneously with storing the packaging object C in the storage unit 12, that is, in the storing process, or the packaging object is stored in the shaped resin film 11 that has been fed out. You may perform before accommodating in the part 12, ie, before an accommodation process.

  Next, the lid film 70 is unwound from the original roll 71 arranged above the shaped resin film 11 being transported horizontally, and the opening 12a of the storage unit 12 after the packaging object C is stored is opened. The film 70 for lid | covers is arrange | positioned so that it may block up. And the sealing film 80 provided with the heat sealing mechanism heat seals the film 70 for lid | covers on the periphery of each accommodating part 12 in the shaping resin film 11, and seals each accommodating part 12 (sealing process).

After such a sealing step, the periphery (flange portion) of each storage part 12 heat-sealed by a cutting device 90 having a vertical cut mechanism and a horizontal cut mechanism so as to be separated for each storage part 12. Cut (cutting step). Moreover, you may trim the edge part of the width direction of the heat-sealed shaped resin film 11 and the film 70 for lid | covers as needed.
Thereby, the individual packaging bodies P in which the packaging objects C are stored in the storage unit 12 can be obtained continuously.

  The lid film 70 may have a single-layer structure or a multi-layer structure, and in this case, the configuration is selected according to the heat sealing property, gas / water vapor barrier property, and the like. For example, the surface to be sealed with the shaped resin film 11 is preferably made of PE, PP, or the like in terms of heat sealability.

When the storage unit 12 is sealed, the storage unit 12 is sucked into a vacuum state for the purpose of maintaining the freshness of the packaging object C or the storage unit 12 is filled with a gas such as nitrogen gas or carbon dioxide gas. May be.
Further, the sealing in the sealing step is not limited to heat sealing, and may be, for example, ultrasonic sealing.

  In the case of packaging using the folded body 10B of FIG. 2 as the shaped resin film continuous body, the shaped resin film 11 is continuously drawn out from the folded body 10B, similarly to the case of the wound body 10A. , Storage process, sealing process, cutting process. Thereby, a package is obtained.

As described above, the shaped resin film wound body 10A as shown in FIG. 1 is obtained by winding the long shaped resin film 11 in which the storage portion 12 is already formed. Further, the shaped resin film folded body 10B as shown in FIG. 2 is obtained by folding the long shaped resin film 11 in which the storage portion 12 has already been formed. Therefore, by using such a shaped resin film continuum, it is not necessary to perform a molding process for molding the storage unit 12 in a site where fresh food, prepared dishes, etc. are packaged, such as a backyard of a retail store. . Therefore, non-tray packaging can be performed at a high packaging processing speed at the packaging site. The molding process of the storage portion may involve preheating of the resin film before molding, cooling after molding, and the like, and time is required. Therefore, omitting the molding process of the storage part is a great merit at the packaging site.
Further, the shaped resin film wound body 10A and the shaped resin film folded body 10B described above are very compact because they are wound or folded in a state where the storage portion 12 is compressed. is there. Therefore, even if the molding site where the storage unit 12 is molded and the packaging site where the packaging object C is packaged are separated, it can be transported without any problem.

  In the illustrated wound body 10A, the shaped resin film 11 is wound in a roll shape so that the opening 12a side is the outside and the bottom 12b side is the inside, but the opening 12a side is the inside and the bottom 12b side is the It may be wound so as to be on the outside. At this time, if it is difficult for the storage portion 12 to be compressed during winding, the storage portion 12 may be compressed by the compression mechanism described above.

  The shape and size of the storage portion 12 and the number of storage portions 12 formed in the width direction of the shaped resin film 11 can be appropriately determined according to the packaging object C. Examples of the packaging object C include fresh foods such as meat and fish and foods such as cooked prepared dishes, as well as pharmaceuticals, medical supplies, parts, miscellaneous goods, stationery, toys and the like.

C: Packaging object 10A: Shaped resin film roll 10B: Shaped resin film folded body 11: Shaped resin film 12: Storage part 12a: Opening part of storage part 70: Film for lid

Claims (1)

It is composed of a long shaped resin film in which a plurality of concave storage portions for storing packaging objects are formed, and a continuous shaped resin film wound or folded in a state where the storage portion is compressed,
The housing portion of the shaping resin film fed out from the shaping resin film continuum, a storage step of storing the object to be packaged,
A sealing step of sealing a lid film to the shaped resin film so as to close the opening of the storage part after the packaging object is stored ,
A packaging method comprising: an unfolding step of unfolding the housing portion of the shaped resin film that has been fed out during or before the housing step .

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