JP6457332B2 - Vacuum packaging bag - Google Patents

Description

  The present invention relates to a vacuum packaging bag that can suppress drip accumulation and reduce deterioration of foodstuffs.

  Vacuum packaging using a vacuum packaging bag is widely used as a technique for preserving various foods without rot.

  To date, vacuum packaging bags have been improved according to various purposes. For example, the purpose of sufficiently increasing the deaeration efficiency and the purpose of preventing the formation of trapped air zones during vacuum packaging. For this purpose, a technique for embossing a film of a vacuum packaging bag has been developed (see Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 60-0777830 JP-T 2006-521256

  However, there is still room for improvement in the vacuum packaging bags described in the above prior art documents. For example, when foodstuffs such as meat and seafood are vacuum-packaged using a vacuum packaging bag, juice called drip may be generated due to the self-digestion of the foodstuff. And if a foodstuff continues to immerse in a drip in a vacuum packaging bag, deterioration of foodstuffs, such as meat and seafood, will be accelerated | stimulated. Thus, in the said conventional vacuum packaging bag, there existed a subject that the drip accumulation was easy to produce in the vicinity of a foodstuff, and deterioration of a foodstuff was easy to be accelerated | stimulated.

  Then, an object of this invention is to provide the vacuum packaging bag which can suppress a drip accumulation and can reduce deterioration of a foodstuff.

The gist of the present invention is as follows.
The vacuum packaging bag of the present invention is formed by sealing a pair of overlapped films with at least a part of their edges, and the inner surface of at least one of the pair of films has a film thickness. Embossing is performed to form a recess that is a portion located on the outermost surface side in the thickness direction and a convex portion having a portion located on the innermost surface side in the thickness direction of the film, wherein the recess is the at least It is continuous over the whole surface of one film, the space | interval (width | variety of a recessed part) between the said convex parts is 0.1-1.0 mm, and with respect to the area of the said at least one film of the said convex part The ratio (area ratio of convex portions) is 20 to 70%.
Here, in the vacuum packaging bag of the present invention, the number density of the protrusions is preferably 15 to 45 pieces / cm ² , and the width of the protrusions is preferably 0.5 to ³ mm. The maximum distance in the thickness direction of the film between the convex portion and the concave portion is preferably 20 to 100 μm.
Further, in the vacuum packaging bag of the present invention, the planar shape of the convex part is a circular system shape and a rectangular system shape, and the area of the convex part of the circular system shape and the area of the convex part of the rectangular system shape The ratio is preferably 5: 1 to 1:10.

  According to the vacuum packaging bag of the present invention, drip accumulation can be suppressed and deterioration of foodstuffs can be reduced.

It is a perspective view which shows the vacuum packaging bag of this embodiment. (A) is a top view which shows a part of embossing pattern formed in the inner surface of the film of the vacuum packaging bag of 1st embodiment of this invention. (B) (i) to (iv) show the film shown in (a), respectively, a plane along line AA, a plane along line BB, a plane along line CC, and a line DD. It is sectional drawing when cut | disconnecting by the surface in alignment with. (A) is a top view which shows a part of embossing pattern formed in the inner surface of the film of the vacuum packaging bag of 2nd embodiment of this invention. (B) (i), (ii) is sectional drawing when the film shown to (a) is each cut | disconnected by the surface in alignment with line AA, and the surface in alignment with line BB. (A) is a top view which shows a part of emboss pattern formed in the inner surface of the film of the vacuum packaging bag used as the first comparative example with respect to the vacuum packaging bag of this embodiment. (B) (i), (ii) is sectional drawing when the film shown to (a) is each cut | disconnected by the surface in alignment with line AA, and the surface in alignment with line BB. (A) is a top view which shows a part of emboss pattern formed in the inner surface of the film of the vacuum packaging bag used as the 2nd comparative example with respect to the vacuum packaging bag of this embodiment. (B) (i), (ii) is sectional drawing when the film shown to (a) is each cut | disconnected by the surface in alignment with line AA, and the surface in alignment with line BB. (A) is a top view which shows a part of emboss pattern formed in the inner surface of the film of the vacuum packaging bag used as the 2nd comparative example with respect to the vacuum packaging bag of this embodiment. (B) (i), (ii) is sectional drawing when the film shown to (a) is each cut | disconnected by the surface in alignment with line AA, and the surface in alignment with line BB. The vacuum packaging bag of the first embodiment (Example 1 (1b)) of the present invention shown in FIG. 2, the vacuum packaging bag of the second embodiment (Example 2 (2b)) of the present invention shown in FIG. 3, FIG. The vacuum packaging bag of the first comparative example (Comparative Example 1 (1b)) for the vacuum packaging bag of this embodiment shown in FIG. 5, the second comparative example (Comparative Example 2 (2b)) of the vacuum packaging bag of this embodiment shown in FIG. 7) is a photograph of the vacuum packaging bag of the third comparative example (Comparative Example 3 (3b)) for the vacuum packaging bag of the present embodiment shown in FIG. 6 taken from the inside of the bag. (A) is a photograph taken when the state of the vacuum packaging bag of Example 1 (1b) when the diffusion rate of the drip was calculated. (B) is a photograph when the state of the vacuum packaging bag when both of the pair of films are mirror films is photographed.

Hereinafter, a form for carrying out the present invention (hereinafter simply referred to as “the present embodiment”) will be described in detail with reference to the drawings as necessary. The following embodiments are exemplifications for explaining the present invention, and the present invention is not limited to the following embodiments, and can be appropriately modified and implemented within the scope of the gist thereof. .
In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

In FIG. 1, the vacuum packaging bag of this embodiment is shown with a perspective view.
The vacuum packaging bag 1 (hereinafter, also referred to as “vacuum packaging bag 1”) of the present embodiment seals a pair of stacked films 2 (2a, 2b) with at least a part of the edge 2e. It is a bag. More specifically, in the vacuum packaging bag 1 shown in FIG. 1, two rectangular films 2 a and 2 b having the same size have one end 2 ee 1 in the longitudinal direction De of the film 2 and both ends 2 ew in the width direction Dw of the film 2. The other end 2ee2 in the longitudinal direction De of the film 2 forms an opening 1op of the vacuum packaging bag 1. The film 2 is sealed at (2ew1, 2ew2).

The shape of the pair of films 2 (2a, 2b) is rectangular in the vacuum packaging bag 1 shown in FIG. 1, but in the vacuum packaging bag of the present invention, the shape of the present invention is not limited thereto. Any shape may be used as long as the effect can be obtained.
In addition, the part to be sealed may be any part as long as the opening 1op is secured in the vacuum packaging bag 1.

And in the vacuum packaging bag 1, the part located in the outermost surface side about the thickness direction Dt of the film 2 in the inner surface 2ai of at least one film 2a among the pair of films 2 (2a, 2b) constituting the bag The embossing which forms the recessed part 3i which is and the convex part 3e which has a part located in the innermost surface side about the thickness direction Dt of the film 2 is given. In the vacuum packaging bag 1 shown in FIG. 1, only the one film 2a of the pair of films 2 (2a, 2b) is embossed.
The “convex portion 3e” refers to a portion protruding from the inside of the bag.

  FIG. 2 (a) shows a top view of a part of the emboss pattern formed on the inner surface of the film of the vacuum packaging bag of the first embodiment of the present invention. 2 (b) (i)-(iv), the film shown in FIG. 2 (a) is respectively a surface along line AA, a surface along line BB, a surface along line CC, Sectional drawing when cut | disconnecting by the surface along line DD is shown.

In the vacuum packaging bag 1 of the first embodiment shown in FIG. 2, the portion that is the convex portion 3 e when viewed from the inside of the bag is a portion that is the concave portion 3 i when viewed from the outside of the bag, but in the vacuum packaging bag of the present invention, Without being limited to this configuration, the outer surface of the film 2 may be flat (mirror-like) while forming the convex portions 3e on the inner surface 2i of the film 2.
In particular, in the vacuum packaging bag 1 of the first embodiment shown in FIG. 2, a line indicating a “recess” in the cross-sectional view shown in FIG. 2B (indicated by a broken line in FIG. 2) according to the embossing property. Are located on the same straight line.

In addition, in the vacuum packaging bag of this invention, as long as the effect of this invention is acquired, the said embossing may be given to both of a pair of films 2 (2a, 2b).
However, the present invention that the projections 3e provided on one film 2a and the recesses 3i provided on the other film 2b are fitted to each other, thereby suppressing sticking between the films 2a and 2b during vacuum packaging. Therefore, it is preferable that the embossing is performed only on one film 2a of the pair of films 2 (2a, 2b) as shown in FIG.

  Hereinafter, the effect obtained in the vacuum packaging bag of this embodiment is described.

  Here, as a comparative example for the vacuum packaging bag 1 of the present embodiment, a pair of films 2 (2a, 2b) is a vacuum in which both surfaces are flat films (films that are not embossed and are mirror surfaces). Consider a packaging bag. In the case of this comparative example, at the time of vacuum packaging, there is no space in which gas or liquid can be held between the films 2a and 2b, and the films 2a and 2b may stick to each other. There may be no gap through which the drip can pass. For this reason, the drip cannot move in the direction Ds along the film 2, and drip accumulation tends to occur in the vicinity of the food, and the deterioration of the food is easily promoted.

On the other hand, the vacuum packaging bag 1 of this embodiment is embossed on one film 2a of the pair of films 2 (2a, 2b) when vacuum packaged (for example, with a degree of vacuum of 80 to 99%). Therefore, it has a feature that a vacuum space is generated in a portion surrounded by the convex portion 3e and the concave portion 3i.
Moreover, in the vacuum packaging bag 1 of this embodiment, since the convex part 3e and the recessed part 3i are moderately scattered, the convex part 3e provided in one film 2a and the other film 2b stick locally. Since the films 2a and 2b do not stick to each other in the entire film 2, the scale of the films 2a and 2b attached to each other at the time of vacuum packaging is suppressed.

Here, when foodstuffs, such as meat and seafood, were accommodated in the vacuum packaging bag 1 of this embodiment and this vacuum packaging bag was vacuum-packed (for example, with a degree of vacuum of 80 to 99%), it occurred on the foodstuff. A phenomenon occurs in which the drip is sucked and stored in a vacuum space formed by the above-described convex portions 3e and concave portions 3i. By this phenomenon, it is possible to move the drip away from the surface of the food material. As a result, the contact area between the food material and the drip can be reduced, drip accumulation can be suppressed, and deterioration of the food material can be reduced.
Moreover, in the vacuum packaging bag 1 of this embodiment, since the convex part 3e and the recessed part 3i are moderately scattered, sticking of film 2a, 2b is suppressed and a drip passes between film 2a, 2b. Therefore, the drip generated on the food material passes through the gap by capillary action and moves in the direction Ds along the film 2. By this phenomenon, the drip can be delocalized over the vacuum packaging bag 1, and the drip can be removed from the vicinity of the foodstuff. As a result, the contact area between the food and the drip can be reduced, drip accumulation can be suppressed, and deterioration of the food can be reduced.

  Furthermore, since the vacuum packaging bag 1 of this embodiment is provided with the flow path of the gas and fluid stretched around the whole bag, favorable deaeration and drip diffusion can be obtained. Therefore, wrinkles are not easily generated in the vacuum packaging bag 1 in the state in which the contents are put, and the appearance of the vacuum packaging bag 1 is beautiful.

  In addition, the embossing pattern of the vacuum packaging bag 1 of this embodiment is not limited to what is shown in FIG. 2, The effect of the said this invention can be acquired irrespective of an embossing pattern (after-mentioned).

  Here, in the vacuum packaging bag 1 of this embodiment, it is important that the recessed part 3i is continuous over the whole surface of one film 2a. According to this configuration, drip generated on the food during vacuum packaging can be widely delocalized in the entire vacuum packaging bag 1. Moreover, according to this structure, it is possible to ensure a gas and liquid flow path that communicates from one end side (the back side) in the longitudinal direction De of the film 2 to the other end side (the opening 1op side) in the longitudinal direction De. Since it becomes easy, sufficient deaeration can be performed when vacuum packaging is performed.

Moreover, in the vacuum packaging bag 1 of this embodiment, it is important that the space | interval (width | variety of the recessed part 3i) between the convex parts 3e is 0.1 mm or more from a viewpoint of fully obtaining the flow path of gas and liquid. The thickness is preferably 0.2 mm or more, and from the viewpoint of sufficiently obtaining the physical strength of the unevenness that does not cause the flow path to be crushed by the external pressure, it is important that the flow path is 1.0 mm or less, and 0.9 mm or less. Preferably, it is 0.8 mm or less.
The “interval between the convex portions 3e (width of the concave portion 3i)” refers to the shortest distance between the adjacent convex portions 3e, and when there are a plurality of adjacent convex portions 3e, the shortest of the shortest distances. Refers to things.

In the vacuum packaging bag 1 of the present embodiment, the ratio of the area of the convex part 3e to the area of the one film 2a (area ratio of the convex part 3e) forms a flow path while sufficiently obtaining gas and liquid flow paths. From the viewpoint of obtaining the effect of sufficiently obtaining the physical strength of the unevenness in a well-balanced manner and enhancing the effect of suppressing drip accumulation, it is important that it is 20% or more, preferably 30% or more, and 35% or more. More preferably, it is important that it is 70% or less, preferably 65% or less, more preferably 60% or less, and most preferably 50%.
In addition, "the ratio of the area of the convex part 3e with respect to the area of one film 2a (area ratio of the convex part 3e)" refers to the ratio calculated | required by the area in planar view, and "the area of film 2a (2)" Indicates the area of the film 2a (2) portion excluding the seal portion at the end of the film 2a (2).

Furthermore, in the vacuum packaging bag 1, the number density of the convex portions 3e is 15 pieces / cm ² or more from the viewpoint of suppressing the sticking between the films 2a and 2b and sufficiently obtaining gas and liquid flow paths. Is more preferably 20 pieces / cm ² or more, and from the viewpoint of sufficiently obtaining the physical strength of the irregularities forming the flow path, it is preferably 45 pieces / cm ² or less, and 40 pieces / cm ^2. More preferably,

Further, in the vacuum packaging bag 1, the width of the convex portion 3 e provides a well-balanced effect of sufficiently obtaining the physical strength of the irregularities forming the flow path while sufficiently obtaining the flow paths of gas and liquid. From the viewpoint of enhancing the effect of suppressing the above, it is preferably 0.5 mm or more, more preferably 1.0 mm or more, further preferably 3.0 mm or less, and further preferably 2.5 mm or less. preferable.
The “width of the convex portion 3e” refers to the maximum width of the convex portion 3e in plan view.

  Furthermore, in the vacuum packaging bag 1, the maximum distance (embossing depth) between the convex portion 3e and the concave portion 3i in the thickness direction Dt of the film 2 is sufficient for the space between the films 2a and 2b, and the flow path of gas and liquid Is preferably 20 μm or more, more preferably 30 μm or more, and from the viewpoint of sufficiently obtaining the physical strength of the irregularities, it is preferably 100 μm or less, and is preferably 90 μm or less. Further preferred.

  Hereinafter, an emboss pattern shown in FIG. 2 will be described as an example of an emboss pattern that is a pattern woven by the convex portions 3e and the concave portions 3i formed on the film 2 by embossing.

The shape of each convex portion 3e in plan view may be a circular system shape such as a circular shape, an elliptical shape, or other rounded shape, and a circular shape is preferable from the viewpoint of forming a flow path with good liquid diffusion efficiency.
Moreover, the planar view shape of each convex portion 3e may be a rectangular shape such as a square, a rectangle, a parallelogram, a rhombus, a trapezoid, a triangle, etc., and the physical strength of the irregularities to such an extent that the flow path is not crushed by external pressure. From the viewpoint of obtaining, a square and a rectangle are preferable. Note that the rectangular shape may be slightly rounded at the corners as shown in FIG.
Incidentally, in the first embodiment shown in FIG. 2, the three types of projections 3e in plan view are a circle (projection 3ec1), a square (projection 3er1), and a rectangle (projection 3er2), respectively.

Moreover, as a shape (hereinafter, also referred to as “first cross-sectional shape”) of each convex portion 3e in a cross section when the film 2 is cut along a surface along the thickness direction Dt of the film 2 and along a given direction. A circular shape such as a part of a circular outline (for example, a semicircular shape), a part of an elliptical outline (for example, a semi-elliptical shape), a shape having other curvature, or the like, and a flow path with good liquid diffusion efficiency From the viewpoint of formation, a part of the circular outline is preferable. In the case of a shape having a curvature, it is preferable that the position of the center of curvature is located on the inner side of the bag rather than the outer side of the bag from the viewpoint of preventing the flow path from being crushed by the external pressure.
In addition, the first cross-sectional shape may be a rectangular shape such as a square, a rectangle, a trapezoid, or a triangle, and is preferably a square, a rectangle, or a trapezoid from the viewpoint of obtaining the physical strength of the unevenness forming the flow path. Note that the rectangular shape may be slightly rounded at the corners as shown in FIG.

  Furthermore, the shape of each convex portion 3e in the cross section when the film 2 is cut along a surface along the thickness direction Dt of the film 2 and perpendicular to the given direction (hereinafter referred to as “second cross sectional shape”). May also be the same as the first cross-sectional shape described above.

  In addition, the curvature radius of the roundness of the corners in the planar view shape of the convex portion 3e and the first and second cross-sectional shapes may be 0.05 mm or more from the viewpoint of obtaining the physical strength of the unevenness forming the flow path. 0.1 mm or more, preferably 0.5 mm or less, preferably 0.4 mm or less, and particularly preferably 0.2 mm.

  Incidentally, in the first embodiment shown in FIG. 2, the surface along the thickness direction Dt of the film 2 and the direction along 45 ° with respect to the longitudinal direction De of the film 2 as the surface along the given direction described above. (Refer to FIG. 2 (b) (i)) as a plane along a direction orthogonal to the given direction described above, −45 ° along the thickness direction Dt of the film 2 and with respect to the longitudinal direction De of the film 2. 2 (b) (ii), the first cross-sectional shape of the convex portion 3e shown in FIGS. 2 (b) (i) is a circular contour line, respectively. The second cross-sectional shape of the convex portion 3e shown in FIG. 2 (b) (ii) is partly (convex portion 3ec1) and rectangular (convex portion 3er2). This is the same as the first cross-sectional shape of the convex portion 3e shown in FIGS.

  Further, in the first embodiment shown in FIG. 2, the surface along the thickness direction Dt of the film 2 and the width direction Dw of the film 2 (FIG. 2 (b) (iii) ))) As a plane along a direction perpendicular to the given direction described above, a plane along the thickness direction Dt of the film 2 and along the longitudinal direction De of the film 2 (see FIGS. 2 (b) and (iv)). 2 (b) and (iii), the first cross-sectional shape of the convex portion 3e shown in FIG. 2B is a part of the circular outline (the convex portion 3ec1) and a rectangle (the convex portion 3er1), respectively. Further, the second cross-sectional shape of the convex portion 3e shown in FIGS. 2B and 2Iv is the first shape of the convex portion 3e shown in FIG. 2B and FIG. It is the same as the cross-sectional shape.

  In the vacuum packaging bag of the present invention, the first cross-sectional shape and the second cross-sectional shape may be the same or different.

In the vacuum packaging bag 1 of the present embodiment, the three-dimensional shape of the convex portion 3e includes a part of a sphere, a cylinder, taking into account the above-described planar view shape, second cross-sectional shape, and second cross-sectional shape. A cone, a truncated cone, a truncated hemisphere, etc., a part of a sphere, a truncated hemisphere is preferable, and a quadrangular prism (eg, a rectangular parallelepiped, a cube), a quadrangular pyramid, a truncated quadrangular pyramid, etc. A quadrangular prism and a truncated quadrangular pyramid are preferable.
Incidentally, in the first embodiment shown in FIG. 2, the three-dimensional shapes of the three types of convex portions 3e are a part of a sphere (convex portion 3ec1), a rectangular parallelepiped (convex portion 3er1), and a rectangular parallelepiped (convex portion 3er2).

  Here, the planar view shape of each convex part 3e is a circular system shape and a rectangular system shape, that is, this embodiment uses a planar view shape of a plurality of types of convex parts 3e including a circular system shape and a rectangular system shape. In the vacuum packaging bag 1, the ratio of the area of the convex part 3e having the circular shape and the area of the convex part 3e having the rectangular shape balances the effect of sufficiently obtaining the strength of the unevenness while obtaining a sufficient flow path. From a well-obtained viewpoint, the ratio is preferably 5: 1 to 1:10, more preferably 2: 1 to 1: 5.

  The vacuum packaging bag 1 of the present embodiment is preferably manufactured using an embossing roll from the viewpoint of manufacturing efficiency and the like, and the embossing pattern of the vacuum packaging bag 1 is a pattern having unit units due to such manufacturing restrictions. It is preferable that

In FIG. 2A, the unit unit U defined for the emboss pattern in the vacuum packaging bag 1 of the first embodiment of the present invention is shown by a square frame. In addition, the dimensions described in FIG. 2 (a) are the dimensions in Example 1 (described later) included in the first embodiment of the present invention, and the dimensions in the first embodiment of the present invention are these. It is not limited to specific dimensions.
As shown in FIG. 2 (a), the unit unit U in the first embodiment is provided with a convex portion 3ec1 whose three-dimensional shape is a part of a sphere, at 1/4 corners at the four corners of the unit unit U and at the center. One, ie, two in five places, and the convex part 3er1, which is a rectangular parallelepiped having a larger three-dimensional shape, is ½ on four sides of the unit unit U, ie, two in four places, and the three-dimensional shape is smaller. Are provided on the two diagonals of the unit unit U, that is, four in four places.

More specifically, as shown in FIG. 2 (a), the center of the circular shape of the projection 3ec1 in plan view is located at four vertices of a square indicating the unit unit U at four locations, and at one location, The convex portion 3 ec1 is arranged so as to be located at the center of gravity of the square indicating the unit unit U.
Further, the center of the square of the convex shape 3er1 in plan view is positioned at the four midpoints of the four sides of the square indicating the unit unit U, and one of the diagonal lines of each square coincides with the side. Thus, the convex part 3er1 is arrange | positioned.
Furthermore, the convex portion 3er2 is arranged so that the rectangular shape in plan view of the convex portion 3er2 is divided into two equal parts in the longitudinal direction by the diagonal line of the unit unit U positioned on the rectangle itself.

  From the viewpoint of effectively obtaining the effects of the present invention, the circular radius of the convex portion 3ec1 in plan view is preferably 0.5 mm or more, more preferably 1.0 mm or more, and 3 It is preferably 0.0 mm or less, more preferably 2.5 mm or less, and particularly preferably 1.6 mm, as shown in FIG.

  The length of one side of the square in a plan view shape of the protrusion 3er1 is preferably 0.5 mm or more, and more preferably 1.0 mm or more, from the viewpoint of effectively obtaining the effects of the present invention. Moreover, it is preferable that it is 3.0 mm or less, it is further more preferable that it is 2.5 mm or less, and it is especially preferable that it is 1.6 mm as it shows as a dimension in Fig.2 (a).

  The length of the long side of the rectangular shape of the projection 3er2 in plan view is preferably 0.7 mm or more, and more preferably 1.0 mm or more, from the viewpoint of effectively obtaining the effects of the present invention. Moreover, it is preferable that it is 3.0 mm or less, it is further more preferable that it is 2.5 mm or less, and it is especially preferable that it is 1.3 mm as shown as a dimension in Fig.2 (a).

  In addition, the length of the short side of the rectangular shape in plan view of the convex portion 3er2 is preferably 0.5 mm or more, and preferably 0.7 mm or more from the viewpoint of effectively obtaining the effects of the present invention. More preferably, it is preferably 2.5 mm or less, more preferably 2.0 mm or less, and particularly preferably 1.1 mm as shown in FIG. 2 (a) as a dimension.

  Here, in the embossing pattern in the vacuum packaging bag 1 of the first embodiment of the present invention, the distance between the convex portions 3ec1 and the convex portions 3er2 is the interval between the convex portions 3e, and the interval between the convex portions 3e is as follows. Is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 0.6 mm or less, from the viewpoint of effectively obtaining the effects of the present invention. More preferably, it is particularly preferably 0.32 mm as shown in FIG. 2A as dimensions.

  The area ratio of the convex portion 3e is preferably 45% or more, more preferably 50% or more, and preferably 70% or less from the viewpoint of effectively obtaining the effects of the present invention. 65% or less is more preferable, and 58.6% is particularly preferable.

From the viewpoint of effectively obtaining the effects of the present invention, the number density of the convex portions 3e in the emboss pattern of the first embodiment is preferably 20 pieces / cm ² or more, and more preferably 25 pieces / cm ² or more. It is preferably 45 pieces / cm ² or less, more preferably 40 pieces / cm ² or less, and particularly preferably 32 pieces / cm ² .

  Other specifications in the emboss pattern of the first embodiment are not particularly limited and may be as described above.

FIG. 3A shows a top view of a part of the emboss pattern formed on the inner surface of the film of the vacuum packaging bag of the second embodiment of the present invention. 3 (b) (i) and (ii) are cross-sectional views when the film shown in FIG. 3 (a) is cut along a plane along line AA and a plane along line BB, respectively. .
The embossing pattern of the second embodiment is the same as the embossing pattern of the first embodiment except that the embossing pattern of the second embodiment does not have the convex portion 3er1 that is a large rectangular parallelepiped.

  As for the radius of the circular shape of the planar view shape of the convex portion 3er1, the length of the long side of the rectangular shape of the planar shape of the convex portion 3er2, and the length of the short side of the rectangular shape of the convex portion 3er2 in the planar view It may be the same as the range in the case of the emboss pattern.

  Further, the interval between the convex portions 3e in the emboss pattern of the second embodiment may be the same as the range in the emboss pattern of the first embodiment.

  The area ratio of the convex portion 3e is preferably 20% or more, more preferably 30% or more, and preferably 60% or less from the viewpoint of effectively obtaining the effects of the present invention. 50% or less, more preferably 38.4%.

From the viewpoint of effectively obtaining the effects of the present invention, the number density of the convex portions 3e in the emboss pattern of the second embodiment is preferably 15 pieces / cm ² or more, and more preferably 20 pieces / cm ² or more. It is preferably 35 pieces / cm ² or less, more preferably 30 pieces / cm ² or less, and particularly preferably 24 pieces / cm ² .

  Other specifications in the emboss pattern of the second embodiment are not particularly limited and may be as described above.

The film 2 (2a, 2b) is preferably capable of sealing at least part of the edge 2e, and preferably has heat sealability for practical reasons.
The film 2 preferably includes a heat seal layer and, if necessary, other layers such as a base layer and an intermediate layer included between the heat seal layer and the base layer. The film 2 may be a single layer composed of a heat seal layer, or may be a plurality of layers including a heat seal layer, a base material layer, and other layers. The film 2 (2a, 2b) can be used so that the base material layer is located outside and the heat seal layer is located inside when processed into a bag shape.

Examples of the material for the heat seal layer include low density polyethylene (LDPE), linear low density polyethylene (L / LDPE), ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, and ethylene / acrylic acid. Examples include copolymers, ethylene / acrylic acid ester copolymers, polypropylene, and propylene copolymers. From the viewpoint of odor, low density polyethylene (LDPE), linear low density polyethylene (L / LDPE), polypropylene A propylene copolymer is preferred.
Examples of the material for the base layer and the intermediate layer include a polypropylene stretched film; a polyamide biaxially stretched film such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide); polyethylene terephthalate, polybutylene terephthalate, etc. A biaxially stretched film of polyester resin or the like is preferably used. If necessary, as a base material layer and an intermediate layer, ethylene / vinyl acetate copolymer saponified product (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), etc .; aluminum foil; silica, alumina A gas barrier film such as a biaxially stretched nylon film, a biaxially stretched polyethylene terephthalate film, or a biaxially stretched polypropylene film provided with a vapor deposition layer such as aluminum or a PVDC coating layer may also be used. Among these, as a base material layer and an intermediate layer, a biaxially stretched film of polyamide such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide) or the like of PVDC is used from the viewpoint of preventing the generation of pinholes due to bending. A biaxially stretched nylon film provided with a coating layer is preferred.

  A known dry lamination method or extrusion lamination method (sandwich lamination method) can be used for lamination of the heat seal layer and the base material layer (intermediate layer). In the case of the dry lamination method, the type of adhesive may be selected in consideration of the type of contents, the packaging form, etc., and is not particularly limited. For example, a one-component or two-component polyurethane adhesive is preferable. A two-component polyester polyurethane adhesive is more preferable. In the case of the extrusion lamination method, the resin used for extrusion is not particularly limited. For example, low density polyethylene (LDPE), linear low density polyethylene (L·LDPE), ethylene / α-olefin copolymer, ethylene / acetic acid Examples include vinyl copolymers, ethylene / acrylic acid copolymers, ethylene / acrylic acid ester copolymers, polypropylene, and propylene copolymers. From the viewpoint of odor, low density polyethylene (LDPE), linear low A copolymer of density polyethylene (L / LDPE), polypropylene and propylene is preferred.

The thickness of the film 2 (2a, 2b) constituting the vacuum packaging bag 1 may be 30 μm or more, preferably 40 μm or more, may be 120 μm or less, and is preferably 110 μm or less.
The length De of the film 2 constituting the vacuum packaging bag 1 may be 100 mm or more, preferably 110 mm or more, preferably 700 mm or less, and preferably 650 mm or less.
The width Dw length of the film 2 constituting the vacuum packaging bag 1 may be 80 mm or more, preferably 90 mm or more, may be 650 mm or less, and is preferably 600 mm or less.

  The vacuum packaging bag 1 of the present embodiment uses, for example, a predetermined device such as an embossing machine to superimpose one embossed film 2a and the other film 2b, and then the edge 2e. It can be manufactured by heat-sealing at least a part. Embossing conditions and heat seal conditions can be determined as appropriate according to the physical properties of the film.

  The contents of the vacuum packaging bag 1 of the present embodiment are preferably food materials. Such food includes meat, seafood, crustaceans, vegetables, etc., and drip of meat, seafood, crustaceans, etc. is generated from the viewpoint of effectively obtaining the effect of suppressing the drip accumulation of the present invention. It is preferable that it is a pancreatic food.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to the following Example at all.

  The specification of the vacuum packaging bag of an Example and a comparative example is shown below.

Example 1
A 75 μm thick laminated film using a biaxially stretched polyamide film for the base layer, low density polyethylene (LDPE) for the intermediate layer, and linear low density polyethylene (L / LDPE) for the heat seal layer. Was used.
The film was embossed using an embossing machine equipped with an embossing roll. Using a packaging device, this film and another film that has not been embossed (mirror surface film) are overlapped, and then one end and the width of the two films in the longitudinal direction using a heat sealing machine By heat-sealing at both ends in the direction, a vacuum packaging bag having a size: 200 mm × 300 mm provided with the embossed pattern shown in FIG. 2 was produced.
The dimensions of the embossed pattern of the vacuum packaging bag of Example 1 were as described in FIG. Other specifications are as shown in Table 1.

(Example 2)
A vacuum packaging bag of Example 2 was produced in the same manner as in Example 1 except that the embossed pattern shown in FIG. 3 was used.
The dimensions of the embossed pattern of the vacuum packaging bag of Example 2 were as described in FIG. Other specifications are as shown in Table 1.

(Comparative Examples 1 to 3)
The vacuum packaging bags of Comparative Examples 1 to 3 were produced in the same manner as in Example 1 except that the embossed patterns shown in FIGS.
Various dimensions of the emboss pattern of the vacuum packaging bags of Comparative Examples 1 to 3 were as described in FIGS. 4 (a) to 6 (a). Other specifications are as shown in Table 1.

  FIG. 7 shows a vacuum packaging bag of Example 1 (1b) shown in FIG. 2, a vacuum packaging bag of Example 2 (2b) shown in FIG. 3, a vacuum packaging bag of Comparative Example 1 (1b) shown in FIG. 6 shows a photograph of the vacuum packaging bag of Comparative Example 2 (2b) shown in FIG. 5 and the vacuum packaging bag of Comparative Example 3 (3b) shown in FIG.

  The evaluation method of the vacuum packaging bag of an Example and a comparative example is shown below.

  Prior to the evaluation by the methods (1) and (2) below, 70 g of beef block meat (raw) was placed in the vacuum packaging bags of the produced examples and comparative examples, and a chamber type vacuum packaging machine (manufactured by Hoshizaki Electric Co., Ltd., Using a product name: HPS-300A), a deaeration operation was performed under a condition of a degree of vacuum of 99% × 30 seconds.

(1) Evaluation of drip accumulation suppression effect After the above-described deaeration operation is completed (after vacuum packaging), the vacuum-packed beef block meat is allowed to stand on a flat plate having a horizontal surface so that the film follows the flat plate surface. did. Ten minutes after standing, the percentage of the ratio of the area of the area where the drip was present to the area of the entire film was calculated as the drip diffusion rate (%). It was evaluated that the higher the drip diffusion rate, the higher the effect of suppressing drip accumulation. The evaluation results are shown in Table 1.
Moreover, after storing the vacuum-packed beef block meat in a refrigerator set at 4 ° C. for 1 day, it was observed whether or not a drip pool (about 5 cc pool) was generated in the vacuum packaging bag. Evaluation was performed according to the following evaluation criteria.
<Evaluation criteria (Evaluation: Observation results)>
○: No drip accumulation occurred, x: Drip accumulation occurred Evaluation results are shown in Table 1.

(2) Evaluation of aesthetics Observe the presence and degree of wrinkles around the contents of the vacuum packaging bag with the beef block meat after vacuum packaging in order to determine the appearance of the vacuum packaging bag. evaluated.
<Evaluation criteria (Evaluation: Observation results)>
○: No wrinkle to small or fine wrinkle, ×: large wrinkle Evaluation results are shown in Table 1.

In particular, for the vacuum packaging bag of Example 1, the degree of drip diffusion was observed using a polarizing microscope 5 minutes after degassing and standing.
FIG. 8A shows a photograph of the state of the vacuum packaging bag of Example 1 (1b) when the drip diffusivity was calculated. FIG. 8B shows a photograph of the state of the vacuum packaging bag when both of the pair of films are mirror films.
As shown in FIG. 8, in the vacuum packaging bag of Example 1 of this invention, it turned out that the drip is delocalized over the vacuum packaging bag compared with the control vacuum packaging bag.

  According to the vacuum packaging bag of the present invention, drip accumulation can be suppressed and deterioration of foodstuffs can be reduced.

DESCRIPTION OF SYMBOLS 1 Vacuum packaging bag 1op Opening part 2 Film 2a (At least) One film 2ai (At least) The inner surface of one film 2b The other film 2e The edge of a film 2ee1 One end of the film longitudinal direction 2ee2 The other end of the film longitudinal direction 2ew1 End of the film in the width direction 2ew2 End of the film in the width direction 2i Inner surface of the film 3e Protruding part 3ec1 Convex part 3er1 Convex part 3er2 Convex part 3i Concave De Film longitudinal direction Ds Direction along the film Dt Film thickness direction Dw Film width direction U Unit

Claims (5)

A pair of stacked films is sealed with at least a part of its edges;
The inner surface of at least one of the pair of films has a recess that is a portion located on the outermost surface side in the thickness direction of the film and a portion located on the innermost surface side in the thickness direction of the film. Embossing to form the convex part is given,
here,
The recess is continuous over the entire surface of the at least one film;
The interval between the convex portions is 0.1 to 1.0 mm,
The ratio of the area of the convex portion to the area of the at least one film is 20 to 70%.
A vacuum packaging bag characterized by that. The vacuum packaging bag according to claim 1, wherein the number density of the convex portions is 15 to 45 pieces / cm ² .   The vacuum packaging bag according to claim 1 or 2, wherein a width of the convex portion is 0.5 to 3 mm.   The vacuum packaging bag as described in any one of Claims 1-3 whose maximum distance of the thickness direction of the film of the said convex part and the said recessed part is 20-100 micrometers. The planar view shape of the convex part is a circular system shape and a rectangular system shape,
The vacuum according to any one of claims 1 to 4, wherein a ratio of an area of the convex part of the circular system shape to an area of the convex part of the rectangular system shape is 5: 1 to 1:10. Packaging bag.