JP2005053508A - Tray package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray package easier to unseal to solve the problem that the higher the strength and sealing performance of a tray package the harder the unsealing of the tray package. <P>SOLUTION: A tray 82 bearing a content 80 is wrapped with a heat-shrinkable film F, which is heated to shrink to form the tray package 10. The tray package 10 comprises (1) a first sealed part S1, which is formed by heat sealing the heat-shrinkable film F at the bottom of the tray 82 and extends in a prescribed direction, (2) a pair of second sealed parts S2, which are formed by heat sealing the heat-shrinkable film F on the side edges of the tray 82 and extend in the direction of crossing the prescribed direction, and (3) a tear tape 14, which is placed laterally between the second sealed parts S2 and has both ends heat sealed with the second sealed parts S2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tray package that wraps a tray on which contents such as food are placed.

  Processed livestock products, raw meat, fresh fish, raw confectionery, etc. are often sold on trays made of expanded polystyrene (PSP). At this time, in order to prevent drying and oxidation of these contents, a tray package formed by wrapping the entire tray with a film is used.

An example of such a tray package is disclosed in Patent Document 1. This tray package is configured by wrapping a tray on which contents are placed with a heat-shrinkable film, heat-sealing the film at the bottom and edges of the tray, and heat-shrinking the whole. In such a tray package, generally no means for facilitating opening is provided.
JP-A-4-327153

  In recent years, tray packages have been improved in film strength in order to enhance pinhole resistance, and have been improved in airtightness by heat sealing the film edge to prevent oxidation and drying of the contents.

  However, the higher the strength of the tray package, the more difficult it is to tear, and when heat sealing is performed in order to increase the airtightness, the orientation in the seal portion is broken, making it difficult to tear in one direction from the seal portion. Thus, there was a problem that the higher the strength and sealability of the tray package, the more difficult it is to open.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a tray package that can be easily opened.

  The tray package according to the present invention is a tray package in which a tray on which contents are placed is wrapped in a heat-shrinkable film and thermally contracted. This tray package includes (1) a heat-shrinkable film heat sealed at the bottom of the tray, and a first seal portion extending along a predetermined direction, and (2) heat-shrinkable at the side edge of the tray. A pair of second seal portions formed by heat-sealing the film and extending along a direction intersecting with a predetermined direction; and (3) a pair of second seals which are horizontally placed between the pair of second seal portions. And a tear tape heat-sealed together with the portion.

  This tray package is composed of a heat-shrinkable film, and is heat-sealed at the bottom and side edges of the tray, so that the airtightness is high. And since a tear tape is laid across between a pair of 2nd seal | sticker parts, a film can be torn by this tear tape and opening becomes easy.

  Both ends of the tear tape are preferably heat-sealed in the vicinity of the ends in the longitudinal direction of the pair of second seal portions. In this way, the film can be torn at the side edge of the tray by picking one end of the tear tape and pulling it to the side of the tray, so that the opening is further facilitated.

  It is preferable that a cut is provided in the vicinity of the inside of the portion where the end portion of the tear tape is heat-sealed, which is at least one of the pair of second seal portions. Since the notch is provided not near the outside of the heat-sealed part of the tear tape, but near the inside, the tear tape can be used as a foothold to tear the film and pick one end of the tear tape and pull it to the side of the tray. Can be opened more easily.

  The heat-shrinkable film includes a heat-sealable seal layer, and the tear tape is preferably formed from a material that can be heat-sealable with the seal layer. If it does in this way, the sealing performance in the 2nd seal part will increase, and airtightness will become high as a whole.

  The strength of the tear tape is higher than that of the heat-shrinkable film, and the tear elongation of the tear tape is preferably lower than that of the heat-shrinkable film. In this way, since the tear tape has a higher strength than the heat-shrinkable film, the possibility of the tear tape breaking during the opening is reduced. Further, since the breaking elongation of the tear tape is lower than the breaking elongation of the heat-shrinkable film, it is possible to suppress an extra force from being consumed for the elongation of the tear tape, and it is possible to open the bag with a smaller force.

  The width of the tear tape is preferably 2 mm or more. If the width of the tear tape is smaller than 2 mm, there is a tendency that the tear tape may be broken during opening.

  The width of the second seal portion is preferably 5 mm or more. When the width of the second seal portion is smaller than 5 mm, it becomes difficult to pick the end portion of the tear tape, and the opening tends to be difficult.

  According to the present invention, a tray package that can be easily opened is provided.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a state in which a tray on which contents are placed is wrapped by a tray package according to the present embodiment. FIG. 2 is a perspective view showing a configuration of only the tray package according to the present embodiment. In addition, as shown in FIG. 2, since the tray package is transparent, the film on the bottom side of the tray is seen through. As shown in FIGS. 1 and 2, the tray package 10 is configured by wrapping a tray 82 on which contents 80 such as processed meat products, raw meat, fresh fish, and raw confectionery are wrapped with a heat-shrinkable film. The tray package 10 includes a so-called pillow-type package body 12 and a tear tape 14 for tearing the package body 12.

  As the heat-shrinkable film constituting the packaging main body 12, a multilayer film having an inner surface layer, a core layer, and an outer surface layer can be used.

  As a material constituting the inner surface layer, a resin having heat sealing properties, for example, a polyolefin (PO) resin can be used. Examples of such polyolefin resins include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), ethylene vinyl acetate copolymer (EVA), and polypropylene (PP). It is done.

  As a material constituting the core layer, a material having an oxygen barrier property, for example, ethylene / vinyl alcohol copolymer (EVOH) can be used. Thus, the preservation | save property of the content 80 is improved by comprising a core layer with the material which has oxygen barrier property.

  As a material constituting the outer surface layer, a material excellent in heat resistance and transparency, for example, polyester (PET) or copolyester (CO-PET) can be used.

  The heat-shrinkable film may have a reinforcing layer for improving the strength. Polyamide (PA) resin can be used as the material constituting the reinforcing layer. Examples of the polyamide resin include known aliphatic PAs such as 6-Ny and 6-66Ny copolymers, 6-12Ny copolymers, and 6-66Ny and 6-12Ny copolymers.

A known adhesive is used in producing a multilayer film composed of the outer surface layer, the core layer, the inner surface layer, and the reinforcing layer. The heat-shrinkable film is configured by laminating each layer made of the above materials, and as a specific configuration example, in order from the outer surface layer (layer facing the outside air) to the inner surface layer (layer facing the contents),
CO-PET / Adhesive layer / PA / EVOH / Adhesive layer / VLDPE
Is mentioned. The thickness of each layer is, for example, (1/1/5/3/1/19: unit is μm). The thickness of each layer of the heat-shrinkable film is as described above, but the total thickness of the heat-shrinkable film is preferably 5 μm to 100 μm, and more preferably 10 μm to 50 μm.

  It is preferable to add an antifogging agent for preventing fogging to the inner surface layer. By doing so, there is no possibility of cloudiness due to water droplets, and the tray package 10 having a good appearance can be obtained.

  The tear tape 14 is preferably formed from a material that can be thermally fused to the inner surface layer of the heat-shrinkable film. For example, if the inner surface layer of the heat-shrinkable film is formed from a PE-based material, the tear tape 14 is preferably formed from a PE-based material. If the inner surface layer of the heat-shrinkable film is formed from a PP-based material, the tear tape 14 is preferably formed from a PP-based material. If it does in this way, the sealing performance in end seal part S2 mentioned below increases, and the airtightness of tray packing object 10 becomes high as a whole.

  Here, the width of the tear tape 14 is preferably 2 mm or more. This is because if the width of the tear tape 14 is smaller than 2 mm, the risk of the tear tape 14 breaking during the opening tends to increase. In addition, since it is unpreferable on an external appearance if the width | variety of the tear tape 14 is too large, the width | variety of the tear tape 14 is preferable in it being 10 mm or less.

  A tray 82 on which contents 80 to be packaged by the tray package 10 according to the present embodiment are placed is conventionally used. For example, a foamed polystyrene (PSP) tray and a high impact polystyrene (HIPS) tray are used. , Expanded polystyrene (OPS) tray, polypropylene (PP) tray, and the like, and depending on the contents 80, a paper tray can also be used. The shape of the tray 82 is rectangular or circular in plan view, but is not necessarily limited to these shapes as long as it can be packaged with a heat-shrinkable film.

  The tray package 10 according to the present embodiment is formed as follows. FIG. 3 is a diagram schematically showing a process of manufacturing the pillow-type tray package 10 according to the present embodiment by the packaging machine 84. As shown in FIG. 3A, a tray 82 on which contents 80 such as sausages are placed is sent to a packaging machine 84 by a conveyor 86.

  Next, the heat-shrinkable film F described above is drawn out from the original fabric R, and the heat-shrinkable film F is placed on the tray 82 as shown in FIG. At this time, the above-described tier tape 14 is drawn from the original line L, and is supplied below the heat-shrinkable film F and along the side edge of the tray 82.

  Next, at the position shown in FIG. 3B, both edges F1 and F2 of the heat-shrinkable film F along the transport direction are guided by guide members (not shown) and overlapped as shown in FIG. The Then, as shown in FIG. 6, the edges F1 and F2 of the heat-shrinkable film F are heat-sealed at the bottom of the tray 82 by the rotary sealer 88. Thereby, a center seal portion (first seal portion) S1 extending along the longitudinal direction (predetermined direction) of the tray 82 is formed.

  Next, at the position shown in FIG. 3C, as shown in FIG. 7, the edges F3 and F4 of the heat-shrinkable film F are heat sealed at the front and rear side edges of the tray 82 by the end sealer 90. And cut. Note that heat sealing and cutting may be performed in separate steps. As a result, a pair of end seal portions (second seal portions) S2 extending along the direction intersecting with the extending direction of the center seal portion S1 is formed. At this time, the tear tape 14 is heat-sealed and cut together with the heat-sealing of the edges F3 and F4 of the heat-shrinkable film F. As a result, the tear tape 14 is placed horizontally between the pair of end seal portions S <b> 2 and is along the longitudinal side edge of the tray 82.

  Finally, as shown in FIG. 3, the tray 82 wrapped with the heat-shrinkable film F is sent to the heating chamber 92, and the heat-shrinkable film F is brought into close contact with the tray 82 by heat-shrinking. Such a tray package 10 is manufactured. In addition, when forming center seal part S1 and end seal part S2, you may vent air in the heat-shrinkable film F. Thus, the pillow-type tray package 10 in which the edge portion of the heat-shrinkable film F is heat-sealed is completely hermetically sealed and highly airtight. Therefore, the oxygen concentration inside can be lowered by adding an oxygen scavenger together with the contents 80. Further, in the packaging process described above, the air inside the package can be replaced with an inert gas (for example, a gas mainly composed of nitrogen or the like).

  In the tray package 10 according to this embodiment manufactured through the above steps, as shown in FIGS. 1 and 2, the tear tape 14 is horizontally mounted between a pair of end seal portions S <b> 2, and both ends thereof are end seals. Heat sealed together with the part S2. And since the heat-shrinkable film F heat-shrinks in the heating chamber 92, the tear tape 14 is along the longitudinal side edge of the tray 82 in a slack state.

  Here, in the tray package 10 according to the present embodiment, both ends of the tier tape 14 are heat-sealed in the vicinity of the longitudinal end portions of the pair of end seal portions S2 (for example, within 10 mm from the end portions of the end seal portions S2). Preferably. In this way, by picking one end of the tear tape 14 and pulling it to the side of the tray 82, the packaging body 12 can be torn at the side edge of the tray 82 as shown in FIG. Opening becomes easier.

  Further, it is preferable that a notch 16 is provided in the vicinity of the inside of the portion where the end portion of the tear tape 14 is heat-sealed, which is at least one of the pair of end seal portions S2. Since the notch 16 is provided not in the vicinity of the outside of the portion where the end portion of the tear tape 14 is heat-sealed but in the vicinity of the inside, the one end of the tear tape 14 is grasped while tearing the packaging main body 12 using the notch 16 as a foothold. It can be pulled to the side of the tray 82, making it easier to open. In addition, as the notch | incision 16, well-known things, such as V notch, U notch, I notch, can be used.

  Further, it is preferable that the tear tape 14 has a higher strength than the heat-shrinkable film F, and the tear tape 14 has a breaking elongation lower than that of the heat-shrinkable film F. Here, “strength of the heat-shrinkable film F” refers to strength after heat-shrinking. Further, “strength” of the heat-shrinkable film F refers to breaking strength. This breaking strength can be measured by a tensile test of JIS K7127. The “strength of the tear tape 14” means the breaking strength, and when the yield point appears, it means the maximum point strength. This breaking strength (or maximum point strength) can be measured by a tensile test of JIS K7127. In this way, since the strength of the tear tape 14 is higher than the strength of the heat-shrinkable film F, the possibility of the tear tape 14 breaking during the opening is reduced. Moreover, since the breaking elongation of the tear tape 14 is lower than the breaking elongation of the heat-shrinkable film F, it is possible to suppress an extra force from being spent on the elongation of the tear tape 14 and to open the bag with a smaller force. It becomes.

  Moreover, it is preferable that the width | variety (T of FIG. 1) of the end seal part S2 is 5 mm or more. If the width of the end seal portion S2 is smaller than 5 mm, it becomes difficult to pick the end portion of the tear tape 14, and the opening tends to be difficult. If the width of the end seal portion S2 is too large, it is not preferable in appearance, and the heat-shrinkable film F is wasted. Therefore, the width of the end seal portion S2 is preferably 15 mm or less, and most preferably about 10 mm.

  As described above in detail, the tray package 10 according to the present embodiment is composed of the heat-shrinkable film F, and since the edges are heat-sealed at the bottom and side edges of the tray 82, the airtightness is high. And since the tear tape 14 is laid horizontally between the pair of end seal portions S2, the packaging main body portion 12 can be torn by the tear tape 14, and it is easy even if the strength of the heat-shrinkable film F is increased. Can be opened.

Hereinafter, although the Example of the tray package 10 which concerns on this embodiment is described, this invention is not limited to this.
(Heat shrinkable film)
VS20K No. manufactured by Kureha Chemical Industry Co., Ltd. 3 was used. The structure of this heat-shrinkable film F and the thickness of each layer are as follows.

First, the structure of the layers is from the outer surface layer to the inner surface layer,
CO-PET / Adhesive layer (mod-VLDPE) / PA (Ny6-66) / EVOH / Adhesive layer (mod-VLDPE) / LLDPE
It is. The thickness of each layer is 1/1/5/3/1/19 (unit: μm), and the total thickness is 30 μm.

  This heat-shrinkable film F had a dry heat shrinkage of 160% at 30 ° C. for 30 seconds, both vertically and horizontally.

Further, the heat-shrinkable film F had a breaking elongation after heat shrinking of 182% and a breaking strength of 44.7 N. The breaking elongation and breaking strength were measured by a tensile test of JIS K7127.
(tray)
A commercially available polystyrene foam (PSP) tray was used. The size of the tray 82 was 120 mm × 170 mm × 20 mm.
(Tier tape)
Vaktape (thickness 55 μm) manufactured by PP Payne Company was used. The tear tape 14 was made of a PE material and had a width of 3 mm. This tear tape 14 had a breaking elongation of 50% and a maximum point strength of 55.6N. The elongation at break and the maximum point strength were measured by a tensile test of JIS K7127.

  Using the packaging machine 84 shown in FIG. 3, the tray 82 was packaged with the heat-shrinkable film F through the steps shown in FIGS. 4 to 7. And the heating chamber 92 was passed at 160 degreeC for 5 second, and the heat-shrinkable film F was heat-shrinked, and the tray package 10 as shown in FIG.1 and FIG.2 was manufactured.

  The width of the end seal portion S1 of the tray package 10 was 10 mm. Further, both ends of the tear tape 14 were heat-sealed together with the end seal portion S2 in the vicinity of the end portion in the longitudinal direction of the end seal portion S2 (about 10 mm from the end portion). And the V notch 16 was provided in the inner side vicinity of the site | part by which the edge part of the tear tape 14 was heat-sealed.

  About the tray package 10 which concerns on the said Example, the opening test was done as follows. As shown in FIG. 8, the end seal portion S2 where the end portion of the tier tape 14 is heat-sealed is picked, the end seal portion S2 is cut using the V notch 16 as a foothold, and the tier tape 14 is moved to the tray 82 side. By pulling in the direction, the packaging main body portion 12 was torn and opened at the side edge portion of the tray 82 by the tear tape 14. In the tray package 10 according to this example, the tear tape 14 could be easily opened with a smaller force in all of the ten opening tests.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, a multilayer film is used as the heat-shrinkable film F, but the configuration of the heat-shrinkable film F is not limited to this. For example, as long as heat fusion is possible, the heat-shrinkable film F may have a single-layer structure made of, for example, a PE-based material.

  In the above-described embodiment, as shown in FIG. 3, the tear tape 14 is supplied separately from the heat-shrinkable film F, so that the tear tape 14 is in a state in which the central portion is slackened and between the pair of end seal portions S2. The configuration to be laid horizontally is described. The tear tape 14 may be previously bonded to the heat shrinkable film F with an adhesive or the like, and the tear tape 14 and the heat shrinkable film F may be supplied simultaneously. In this way, both ends of the tier tape 14 are heat-sealed together with the end seal portion S2, and the tier tape 14 is laid across the pair of end seal portions S2, but the central portion of the tier tape 14 is not changed. Is in a state of being adhered to the heat-shrinkable film F. In addition, since the heat-shrinkable film F is heat-shrinked, the tear tape 14 is waved to that extent and the adhesion to the heat-shrinkable film F is partially broken. However, since the tear tape 14 is partially adhered to the heat-shrinkable film F, when the package body portion 12 is torn, the force acts directly on the film via the tear tape 14 and the force escapes. It becomes possible to open with less force.

It is a perspective view which shows a mode that the tray which mounted the content by the tray package which concerns on this embodiment was packaged. It is a perspective view which shows the structure of only the tray package which concerns on this embodiment. It is a side view which shows the manufacturing process (packaging process) of the tray package body which concerns on this embodiment. It is a perspective view which shows the state in which the heat-shrinkable film was covered on the tray. It is a perspective view which shows a mode that the edge part of the width direction of a heat-shrinkable film is piled up on the bottom part of a tray. It is a front view which shows a mode that the edge part of the heat-shrinkable film superimposed on the bottom part of the tray is heat-sealed. It is a perspective view which shows a mode that the edge part of a heat-shrinkable film is heat-sealed in the front-and-rear both-sides edge part of a tray. It is a perspective view which shows a mode that the tray package of FIG. 1 is opened.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tray packaging body, 12 ... Packaging main-body part, 14 ... Tear tape, 16 ... Cutting, 80 ... Contents, 82 ... Tray, 84 ... Packaging machine, 86 ... Conveyor, 88 ... Rotary sealer, 90 ... End sealer, 92 ... heating chamber, S1 ... center seal part, S2 ... end seal part.

Claims (7)

A tray package formed by heat shrinking by wrapping a tray on which contents are placed with a heat shrinkable film,
Heat sealing the heat-shrinkable film at the bottom of the tray, and a first seal portion extending along a predetermined direction;
A pair of second seal portions formed by heat-sealing the heat-shrinkable film at side edges of the tray, and extending along a direction intersecting the predetermined direction;
A tier tape that is laid across the pair of second seal portions and heat sealed at both ends together with the pair of second seal portions;
A tray package comprising: The tray package according to claim 1, wherein the both ends of the tear tape are heat-sealed in the vicinity of the ends in the longitudinal direction of the pair of second seal portions. 3. The tray according to claim 2, wherein a notch is provided in the vicinity of the inside of the portion where the end portion of the tear tape is heat-sealed, at least one of the pair of second seal portions. Packaging body. The tray package according to claim 1, wherein the heat-shrinkable film includes a heat-sealable seal layer, and the tear tape is formed of a material that can be heat-sealable with the seal layer. The strength of the tear tape is higher than the strength of the heat shrinkable film,
The breaking elongation of the tear tape is lower than the breaking elongation of the heat-shrinkable film,
The tray package of Claim 1 characterized by the above-mentioned. The tray package according to claim 1, wherein the tear tape has a width of 2 mm or more. The tray package according to claim 1, wherein the width of the second seal portion is 5 mm or more.

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