JP2020179919A - Distribution packaging body for oil-based foods and laminated film for lid material - Google Patents

Abstract

To provide a distribution packaging body that does not cause problems such as permeation of contents into a lid material side, package tearing, or contents leaking when used for liquid foods having a large amount of oily components.SOLUTION: A distribution packaging body for oil-based foods comprises a lid material having discharge means and a folding line in a center portion of a surface, and a container body that is made of a flexible member whose peripheral edge is fixed to a back surface of the lid material and which forms pocket portion on both sides of the folding line. The lid material includes in this order a surface layer containing a copolymerized polyester resin, an intermediate layer consisting of at least two layers of a polystyrene resin containing layer and an ethylene-vinyl acetate copolymer saponified product resin containing layer, an adhesive resin layer(A), and a seal layer containing a polyethylene resin, and satisfies a predetermined condition.SELECTED DRAWING: Figure 1

Description

The present invention relates to a distributed package and a laminated film for a lid material, which are made of a lid material having a predetermined layer structure and can be suitably used for packaging oil-based foods and the like.

Conventionally, a hard material lid material having a folding line having a half-cut portion in the center of the surface and a protruding discharge means, and a peripheral portion fixed to the back surface of the lid material to provide pockets on both sides of the bending line. A distribution package composed of a container body of a flexible member to be formed is widely used in various fields. The contents are filled when the pocket part is formed by deep drawing of the flexible member, and the contents are taken out by half-cutting by bending the lid material in a V shape so as to sandwich the pocket part. It is done by breaking. That is, the broken portion becomes an opening, and the contents filled in the pocket portion can be easily taken out from the opening.

The distribution package 100 itself illustrated in FIG. 1 has already been proposed by one of the applicants and is known as described in Patent Document 1. In the present invention, other distribution packages may be used as long as they have the above-mentioned basic structure. Examples of such a distribution package include the distribution packages described in Patent Documents 2 to 4. Both were proposed by one of the applicants. Further, although the lid material of the distribution package is described in Patent Document 5, problems such as the use of foods containing a large amount of oily components are not mentioned.

Japanese Unexamined Patent Publication No. 2013-18493 Japanese Unexamined Patent Publication No. 2001-180761 Japanese Unexamined Patent Publication No. 2001-335071 Japanese Unexamined Patent Publication No. 2013-091508 Japanese Unexamined Patent Publication No. 2006-35449

Conventionally, this distribution package has been used for packaging foods, seasonings, etc., and specifically, has been used for packages such as mayonnaise, ketchup, mustard, and jam. However, when it is used for dressings and other liquid foods that contain a large amount of oily components, there is a concern that the contents may permeate into the lid material side, causing problems such as tearing of the package or leakage of the contents. there were.

As a result of diligent studies to solve the above problems, the present inventors have succeeded in obtaining a distribution package that can solve the above problems by using a lid material having a predetermined layer structure for the distribution package. However, the present invention has been completed. That is, the present invention is as follows.

According to the first aspect of the present invention, a lid material having a discharge means and a bending line at the center of the surface and a peripheral portion fixed to the back surface of the lid material to form pockets on both sides of the bending line. It is a distribution package consisting of a container body made of members and a container body made of members.
The lid material is a surface layer containing a copolymerized polyester resin, at least two layers including a polystyrene resin as an intermediate layer, and a layer containing an ethylene-vinyl acetate copolymer saponified resin, and an adhesive resin layer (A). ), And a seal layer containing a polyethylene resin in this order, which satisfies the following (I) to (III).
(I) The layer containing the polystyrene resin of the intermediate layer is 50% or more of the thickness ratio of the intermediate layer (II) The ethylene content of the ethylene-vinyl acetate copolymer saponified resin is 47 mol% or less. (III) The MFR of the adhesive resin constituting the adhesive resin layer (A) measured at a measurement temperature of 220 ° C. and a measurement load of 21.17 N is 5.0 g / 10 minutes or less.

In the present invention, it is preferable that the polystyrene-based resin is at least one of general-purpose polystyrene, impact-resistant polystyrene, and styrene-butadiene block copolymer.

In the present invention, it is preferable that the layer containing the polystyrene-based resin contains 10% by mass or more and 90% by mass or less of any one or more of impact-resistant polystyrene and styrene-butadiene block copolymer.

In the second aspect of the present invention, a lid material having a discharge means and a bending line at the center of the surface and a peripheral portion fixed to the back surface of the lid material to form pockets on both sides of the bending line. A laminated film for a lid material for forming a distribution package for oil-based foods, which is composed of a container body made of members.
The laminated film for the lid material includes at least two layers of a surface layer containing a copolymerized polyester resin, a layer containing a polystyrene resin as an intermediate layer, and a layer containing an ethylene-vinyl acetate copolymer saponified resin, and an adhesive resin. A laminated film for a lid material, which comprises a layer (A) and a sealing layer containing a polyethylene resin in this order and satisfies the following (I) to (III).
(I) The layer containing the polystyrene resin of the intermediate layer is 50% or more of the thickness ratio of the intermediate layer (II) The ethylene content of the ethylene-vinyl acetate copolymer saponified resin is 47 mol% or less. (III) The MFR of the adhesive resin constituting the adhesive resin layer (A) measured at a measurement temperature of 220 ° C. and a measurement load of 21.17 N is 5.0 g / 10 minutes or less.

According to the present invention, by using a lid material having a predetermined layer structure for a distribution package, when the lid material is used for foods having a large amount of oily components (oil-based foods), the contents permeate the lid material side and the packaging is performed. It is possible to obtain a distributed package that can be suitably used for packaging oily foods such as dressings without tearing the body or leaking the contents.

1A and 1B are a plan explanatory view and a side explanatory view of an example of the distribution package 100. FIG. 2 is an explanatory view of a discharge opening in which the tip of the protrusion is open. FIG. 3 is a cross-sectional explanatory view of a laminated body for forming the lid material 10 of the distribution package, which is provided with the half-cut portion 12a. FIG. 4 is a cross-sectional explanatory view of a flexible member for forming the container body 20 of the distribution packaging body 100.

Hereinafter, the present invention will be described in detail.
However, the scope of the present invention is not limited to the embodiments described below.

In addition, in this specification, a "principal component" means a component which occupies 50% by mass or more when the total of the components constituting each layer is 100% by mass, and is preferably 60% by mass or more, preferably 70% by mass. % Or more is more preferable.
Further, when "X to Y" (X and Y are arbitrary numbers) is described, it means "X or more and Y or less", and "preferably larger than X" and "preferably smaller than Y". It includes the meaning of.
Further, even if the upper limit value and the lower limit value of the numerical range in the present specification are slightly out of the numerical range specified by the present invention, the present invention has the same effect as within the numerical range. It shall be included in the equal range of.

First, the outline of the distribution package 100 of the present invention will be described mainly based on FIG. 1 or FIG.

<Distribution packaging 100>
The distribution package 100 of the present invention will be described. The distribution package 100 of the present invention includes a lid material 10 having a discharge means 13 and a folding line 12 at the center of the surface, and pockets on both sides of the folding line 12 with peripheral portions fixed to the back surface of the lid material 10. It is composed of a container body 20 made of a flexible member forming the portions 28 and 28.
The lid material 10 of the distribution package is composed of a laminated body having a predetermined layer structure having a bending line 12 provided with a half-cut portion 12a at the center of the surface and a protruding discharge means 13.

The lid material 10 is relatively harder than the flexible member constituting the container body 20, and the distribution packaging body 100 can be pinched by fingers and bent along the bending line 12, and the protruding discharge means 13 is opened. Has a hardness that can be achieved. Further, the flexible member constituting the container body 20 is relatively softer than the lid material 10, and when the distribution package 100 is pinched by fingers and bent along the bending line 12, the bent lid material 10 is pressed. It is a material that can be deformed so that the contents can be discharged from the protruding discharge means 13 that has been crushed and opened.

Further, the "central portion" of the surface of the lid material 10 is, for example, an area including a line connecting the midpoints of the opposite long sides when the lid material 10 is rectangular, and when the lid material 10 is square, An area including a line connecting the midpoints of opposite sides or an area including one diagonal line, in the case of a diamond, an area including a short diagonal line, and in the case of a circle, one area passing through the center of the circle. It is a region including a straight line, and in the case of an ellipse, it is a region including a straight line passing through the center of the major axis and perpendicular to the major axis, but is not limited thereto.

The discharge means 13 of the lid material 10 may be provided on the bending line 12 provided with the half-cut portion 12a, and may be provided one or more depending on the purpose of use of the distribution package 100. The shape of the protrusion-shaped discharge means 13 is such that the lid member 10 of the distribution package 100 is directed downward and both ends thereof are pinched with fingers around the bending line 12 and bent into a V-shape. Any shape may be used as long as it opens from the apex of 13. For example, it may have a convex shape as shown in FIG. 1, a triangular pyramid shape, a quadrangular pyramid shape, a hemispherical shape, or the like. The protrusion-shaped discharge means 13 can usually be formed by heat-deforming by a mold forming method after a half-cut process.

The container body 20 of the distribution package 100 is formed by fixing peripheral portions to the back surface of the lid material 10 and forming pocket portions 28, 28 on both sides of the bending line 12, and is made of a flexible member.
The peripheral portion (not shown) of the container body 20 is fused to the back surface of the lid material 10. One or a plurality of pocket portions 28, 28 may be provided on both sides of the folding line 12, depending on the purpose of use of the distribution packaging body 100, for example. Further, the pocket portions 28, 28 on both sides of the bending line 12 may be communicated with each other to form one pocket portion 28 straddling the bending line.

The thickness of the lid material 10 can be the same as the thickness range of the lid material usually used as the lid material 10 of the distribution package 100, and specifically, it is usually 250 μm or more and 700 μm or less, preferably 250 μm. It is not less than 500 μm. By doing so, the distributed packaging body is provided with an appropriate elasticity and tactile sensation without impairing the good opening property of the distribution packaging body 100 as the lid material 10 and the moldability of the laminate constituting the lid material 10. The commercial value as 100 can be maintained.

On the surface of the lid material 10, ribs 14 may be formed to reinforce the lid material 10, prevent slipping at the time of opening, or impart design. The shape of the rib is not particularly limited, but for example, it may be a linear rib as shown in FIG.

<Lid material 10>
The lid material 10 constituting the distribution package 100 of the present invention has a surface layer 15 containing a copolymerized polyester resin, a layer 16a containing a polystyrene resin as an intermediate layer 16, and an ethylene-vinyl acetate copolymer saponified resin. It is necessary to provide at least two layers of the layer 16b containing the above, the adhesive resin layer (A) 17, and the seal layer 18 containing the polyethylene resin in this order.
The laminated film provided with each of the above layers is referred to as a laminated film for a lid material. The layer structure of the laminated film for a lid material is shown in FIG. Hereinafter, each layer will be described.

(Surface layer 15: Layer containing copolymerized polyester resin)
The surface layer 15 of the lid material 10 of the present invention is a layer arranged on the outside of the lid material 10 (the side opposite to the container body 20 side (content side) made of a flexible member), and is used for gravure printing or flexography. It is a layer that receives printing ink by a printing method or the like and forms a printing layer. It is also a layer having a function of protecting the intermediate layer 16. The surface layer 15 of such a lid material 10 can be made of a thermoplastic resin that exhibits good printability and print stability, and is made of a copolymerized polyester resin that is particularly excellent in these properties. Usually, the surface layer 15 preferably contains a copolymerized polyester resin as a main component, may contain the same kind or different kinds of copolymerized polyester resin, or may be composed of two or more layers.

The copolymerized polyester resin used for the surface layer 15 may be a copolymerized polyester resin, but in consideration of heat resistance, printing characteristics, etc., an ethylene terephthalate unit is contained in 100 mol% of the units constituting the polyester resin. It is preferably 50 mol% or more, more preferably 60 mol% or more.
Specifically, it is preferable that the terephthalic acid component is contained as a main component in 100 mol% of the polyvalent carboxylic acid component. The ethylene glycol component is preferably contained in an amount of 50 to 95 mol%, more preferably 60 to 90 mol%, in 100 mol% of the polyhydric alcohol component.

As the polyvalent carboxylic acids constituting the polyvalent carboxylic acid component, aromatic dicarboxylic acids, ester-forming derivatives thereof, aliphatic dicarboxylic acids and the like can be used in addition to the above-mentioned terephthalic acid and its ester. Examples of the aromatic dicarboxylic acid include isophthalic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, 5-sodium sulfoisophthalic acid and the like. Examples of the ester derivatives of these aromatic dicarboxylic acids and terephthalic acids include derivatives such as dialkyl esters and diaryl esters. Examples of the aliphatic dicarboxylic acid include glutaric acid, adipic acid, sebacic acid, azelaic acid, oxalic acid, succinic acid, and the aliphatic dicarboxylic acid usually called dimer acid.

Examples of the polyhydric alcohols constituting the polyhydric alcohol component include 1,4-cyclohexanedimethanol, 1,3-propanediol, triethylene glycol, 1,4-butanediol, and 1 in addition to the above-mentioned ethylene glycol. , 6-Hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 2-methyl-1,5-pentanediol, 2,2-diethyl-1,3-propanediol, 1,9-nonane Diol, alkylene glycol such as 1,10-decanediol, trimethylolpropane, glycerin, pentaerythritol, diethylene glycol, dimerdiol, polyoxytetramethylene glycol, polyethylene glycol, bisphenol compound or its derivative alkylene oxide adduct can also be used in combination. ..

As the copolymerized polyester resin used for the surface layer 15, more specifically, terephthalic acid is the main component as the polyhydric carboxylic acid component, and in addition to ethylene glycol as the polyhydric alcohol component, 100 mol% of the polyhydric alcohol component is used. A non-crystalline copolymer polyester containing 5 mol% or more, preferably 10 to 80 mol%, more preferably 15 to 60 mol%, particularly preferably 20 to 50 mol% of 1,4-cyclohexanedimethanol component. It is preferable to use a resin. It is preferable to contain 5 mol% or more of the 1,4-cyclohexanedimethanol component because the printability and impact resistance are improved. Further, by setting the 1,4-cyclohexanedimethanol component to 80 mol% or less, the degree of amorphousness of the copolymerized polyester resin is increased, the impact strength of the film becomes sufficient, and it is preferable from the viewpoint of cost.

The thickness of the surface layer 15 may be in the range of the thickness of the surface layer usually used as the lid material 10 of the distribution package 100, and is preferably 10 μm or more and 50 μm or less, and more preferably 10 μm or more and 40 μm or less. When the thickness of the surface layer 15 of the lid material 10 is 10 μm or more, the surface strength of the laminate constituting the lid material 10 is sufficient, and the printed layer does not peel off together with the surface layer 15 of the lid material 10, which is preferable. On the other hand, when the thickness is 50 μm or less, the half cut 12a to be inserted into the intermediate layer 16 can be easily adjusted, which is preferable.

(Intermediate layer 16)
It is important that the lid material 10 has at least two layers, a layer 16a containing a polystyrene-based resin and a layer 16b containing an ethylene-vinyl acetate copolymer saponified resin, as the intermediate layer 16.

-Layer 16a containing polystyrene resin
The layer 16a containing a polystyrene-based resin (hereinafter, may be referred to as “PS-based resin”) is a layer that imparts strength and openness to the lid material 10. By arranging a PS-based resin having an appropriate crackability, it is possible to exhibit an appropriate opening property when the distribution package 100 is bent. Specific examples of the PS-based resin constituting the layer 16a containing the PS-based resin include general-purpose polystyrene (hereinafter, may be referred to as “GPPS”) and impact-resistant polystyrene (hereinafter, may be referred to as “HIPS”). ), Any of styrene-butadiene block copolymers, or mixtures thereof.

Here, GPPS does not contain a rubber component and has a property of being easily broken. On the other hand, HIPS has a property of being hard to break because it is blended with a rubber component. Therefore, by appropriately controlling the blend ratio of GPPS and HIPS, the crackability that occurs in the lid material 10 when the distribution package 100 is opened can be adjusted. The blending ratio of GPPS and HIPS is preferably 10:90 to 70:30, more preferably 10:90 to 80:20 in terms of mass ratio. By setting the compounding ratio of GPPS and HIPS to the above compounding ratio, it is possible to suppress unintentional opening during transportation and to exhibit appropriate opening properties when bent.

The thickness of the layer 16a containing the PS-based resin can be the same as the thickness range of the PS-based resin layer usually used for the lid material 10 of the distribution package 100, and is usually 150 μm or more and 500 μm or less, preferably 500 μm or less. It is 200 μm or more and 400 μm or less. When the thickness is 150 μm or more, good openness can be obtained when used as the lid material 10 of the distribution package 100. On the other hand, since it is not necessary to make it thicker than necessary, the upper limit is preferably 500 μm or less.
Since the preferable thickness of the laminate constituting the lid material 10 is 250 μm or more and 700 μm or less, the layer 16a containing the PS-based resin in the laminate is the main constituent layer, and the intermediate layer 16 is PS-based. The layer 16a containing the resin needs to have a thickness of 50% or more, assuming that the thickness of the entire intermediate layer 16 is 100%.

Further, since the layer 16a containing the PS-based resin also adjusts the crackability generated in the lid material 10, in the lid material 10 having the bending line 12 provided with the half-cut portion 12a, the half-cut portion 12a is usually used. Is preferably formed from the surface layer 15 side until it reaches the layer 16a containing the PS-based resin, and further, the depth of the half-cut portion 12a is set from the surface layer 15 side of the layer 16a containing the PS-based resin to the thickness of the PS-based resin layer. It is preferable to make a cut to a depth of 10 to 90% of the above.

-Layer 16b containing ethylene-vinyl acetate copolymer saponified resin
The layer 16b containing an ethylene-vinyl acetate copolymer saponified resin (hereinafter, may be referred to as “EVOH”) is a layer that exhibits oxygen barrier properties and prevents oil from penetrating. The layer 16b containing EVOH is laminated on the layer 16a containing a PS resin by a dry lamination method, a coextrusion method, or the like.

The EVOH constituting the layer 16b containing EVOH must have an ethylene content of 47 mol% or less. The ethylene content of EVOH is preferably 29 to 47 mol%, more preferably 32 to 44 mol%.
By setting the ethylene content of EVOH to 47 mol% or less, the permeation of oil can be suppressed, and the delamination between the layer 16a containing the PS-based resin and the EVOH layer 16b can be suppressed.
The saponification degree of EVOH is preferably 90 mol% or more, and more preferably 95 mol% or more. When the degree of saponification is 90 mol% or more, the gas barrier property is sufficient.

By keeping the ethylene content of EVOH within the above range, the permeation of oil, which is the content, is prevented, and by maintaining the ethylene content and the degree of saponification, the coextrusion property of the laminate constituting the lid material 10 and the coextrusion property of the laminate 10 are maintained. The strength can be good. The thickness of the layer 16b containing EVOH is preferably 2 to 15 μm, more preferably 3 to 12 μm, and particularly preferably 5 to 10 μm. By setting the lower limit of the thickness of the layer 16b containing EVOH to 2 μm or more, leakage of the contents can be prevented and good oxygen barrier properties can be maintained. On the other hand, by setting the upper limit of the thickness of the EVOH layer 16b to 15 μm or less, the film-forming property of the film becomes good and the film strength becomes sufficient.

As the intermediate layer 16, it is preferable to have an adhesive resin layer (B) between the layer 16a containing the PS-based resin and the layer 16b containing EVOH. As a result, the adhesiveness between the layer 16a containing the PS-based resin and the layer 16b containing EVOH can be improved. The adhesive resin constituting the adhesive resin layer (B) is not particularly limited as long as the layer 16a containing the PS-based resin and the layer 16b containing EVOH can be bonded to each other, and examples thereof include a modified polyolefin resin. As the modified polyolefin resin, for example, an olefin-based copolymer having a carboxyl group is preferable, and an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, a maleic anhydride-modified polyethylene, and the like are particularly suitable.

Further, another thermoplastic resin such as an adhesive resin can be appropriately added to the layer 16b containing EVOH as needed without losing its function. As the adhesive resin, an adhesive resin constituting the adhesive resin layer (B) can be used.
The amount of the adhesive resin added to the layer 16b containing EVOH is preferably 20 wt% or less as long as the gas barrier property is not lost.

(Seal layer 18: Layer containing polyethylene resin)
The seal layer 18, which should be the back surface of the lid material 10 (the surface on the content side and the surface on the side for sealing with the container body 20), is for welding to the container body 20 made of a flexible member described later. It can have the same structure as the seal layer of the lid material of the conventional distribution package, and needs to be a layer containing a polyethylene-based resin (PE). For example, the seal layer 18 may be a single-layer seal layer 18 made of high-density polyethylene (HDPE), and can impart sealability to the container body 20 and openness of the lid material 10.
Further, the seal layer 18 may be composed of a layer (PE layer) containing two or more PEs of the same type or different types. Specifically, when the seal layer 18 is formed from the PE layer, it may have a multi-layer structure of the PE outer layer on the content side and the PE inner layer inside the PE outer layer. As the PE layer having such a two-layer structure, low-density polyethylene (LDPE), high-density polyethylene (HDPE), or a blend of LDPE and HDPE can be used.

When a blend of LDPE and HDPE is used as the seal layer 18, the blending ratio of LDPE and HDPE should be determined in consideration of the layer thickness and the characteristics required for each of the PE outer layer and the PE inner layer. Is preferable.
That is, since the PE outer layer is located on the content side of the seal layer 18, it is necessary to secure the sealability with the container body 20 made of a flexible member and an appropriate opening property. Therefore, the blending ratio of LDPE It is preferable to increase the value. On the other hand, in the PE inner layer, it is necessary that the “cut” of the layer (membrane) is satisfactorily propagated with the cracking of the PS-based resin layer 16a of the intermediate layer 16, and therefore, the blending ratio of HDPE is increased. Is preferable.
Specifically, the blending ratio of LDPE and HDPE in the PE outer layer is preferably 40:60 to 80:20, more preferably 50:50 to 80:20, and 60:40 in terms of mass ratio. It is more preferably ~ 80:20. On the other hand, the blending ratio of LDPE and HDPE in the PE inner layer is preferably 60:40 to 20:80, more preferably 50:50 to 20:80, and 40:60 to 20:80 in terms of mass ratio. It is more preferably 80.
By using such a PE outer layer and a PE inner layer, it becomes easy to adjust the crackability that occurs in the lid material 10 when the distribution package 100 is opened. Further, by using a blend of LDPE and HDPE, the melt tension can be increased by LDPE when forming a laminated film for a lid material, the film forming property is stabilized, and the lid is excellent in easy splitting when opened by HDPE. It becomes possible to obtain the material 10.

The LDPE preferably has a density of 0.92 g / cm ³ or more, and the HDPE preferably has a density of 0.95 g / cm ³ or more. By increasing the density, better tearability can be imparted to the PE layer.

If the thickness of the seal layer 18 is too thin, it becomes difficult to realize good sealing performance, and if it is too thick, it becomes difficult to realize good cutting at the time of opening. Therefore, the thickness is preferably 10 μm or more and 40 μm or less. .. In particular, when the seal layer 18 is composed of a PE outer layer and a PE inner layer, the thickness of each is preferably 5 μm or more and 20 μm or less. As a result, it is possible to maintain good cutting performance at the time of opening and at the same time maintain good sealing performance.

(Adhesive resin layer (A) 17)
In the lid material 10, the adhesive resin layer (A) 17 is arranged between the layer 16b containing EVOH and the seal layer 18. The adhesive resin constituting the adhesive resin layer (A) 17 is not particularly limited as long as the layer 16b containing EVOH and the seal layer 18 can be adhered to a required strength, but is modified with an unsaturated carboxylic acid or a derivative thereof. Polyolefin-based resins are preferably used.

Examples of such unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, and citraconic acid. Further, esters and anhydrides of these unsaturated carboxylic acids can also be used. Further, examples of the derivative include methyl acrylate, methyl methacrylate, ethyl acrylate, propyl acrylate, butyl acrylate, butyl methacrylate, vinyl acetate, glycidyl acrylate, glycidyl methacrylate, acrylamide, methacrylamide, sodium acrylate and the like. .. As such an adhesive resin, for example, a commercially available product name Admer manufactured by Mitsui Chemicals, Inc. is commercially available, and it is preferable to use this. A linear low density polyethylene (hereinafter sometimes referred to as "LLDPE") type is preferably used. Further, the MFR measured at a measurement temperature of 220 ° C. and a measurement load of 21.17 N needs to be 5.0 g / 10 minutes or less, and preferably 3.0 g / 10 minutes or less. By setting the MFR to 5.0 g / 10 minutes or less, the resin flow of the layer 16b containing EVOH can be suppressed when the distribution package 100 is produced, and the layer 16b containing EVOH can be prevented from being locally thinned. Since it is possible to prevent the oil, which is a substance, from penetrating into the lid material 10, it is possible to prevent the contents from leaking.

Further, the thickness of the adhesive resin layer (A) 17 of the lid material 10 is preferably 5 μm or more and 50 μm or less. Good adhesiveness can be obtained by setting the thickness to 5 μm or more, and good opening property can be obtained by setting the thickness to 50 μm or less.
The laminated body for forming the lid material 10 described above can be produced by a dry laminating method, a coextrusion method, or a method combining these methods. Further, when the front and rear layers are bonded by the coextrusion method, if it is difficult to bond the front and rear resin layers, an appropriate one can be selected from various adhesive resins and bonded depending on the material to be bonded.

Further, for the lid material 10, for example, a laminated film for a lid material is half-cut according to a conventional method, and a protrusion-like discharge in which stress is concentrated when bent by male-female mold molding at a temperature of 170 to 220 ° C. It can be manufactured by forming the means 13 and cutting it into individual lid members 10 as needed. In addition, you may put it into the manufacturing process of a distribution package 100 with a sheet as it is or a plurality of pieces connected together, and finally cut it.

The outermost layer 15, the intermediate layer 16, and the seal layer 18 constituting the lid material 10 may contain other resins and additives as long as the effects of the present invention are not impaired. For example, additives such as nucleating agents, lubricants, heat-resistant stabilizers, oxidation-resistant stabilizers, weather-resistant stabilizers, ultraviolet absorbers, pigments, and dyes may be appropriately added. In particular, nucleating agents such as organic acid metal salts, inorganic fillers, and sorbitol-based nucleating agents are expected to improve moisture resistance and transparency by promoting the crystallization rate and forming microcrystals, and thus pinhole resistance. It may be added as long as the property and flexibility are not impaired.

<Container body 20>
Next, the container body 20 constituting the distribution package body 100 of the present invention will be described. The container body 20 is formed by molding a flexible member composed of at least two layers of a polyamide resin layer 21 located at the outermost layer and a heat seal layer 24. FIG. 4 shows an example of the layer structure of the flexible member constituting the container body 20.

The polyamide resin layer 21 is tough and has excellent impact resistance, pinhole resistance, and deep drawing moldability. The polyamide is not particularly limited, but it is preferable to use a polyamide containing three or more membered rings of lactam, a polymerizable ω-amino acid, a diamine and a dicarboxylic acid as main components (50 mol% or more). The polyamide may be a copolymer of a polyamide component and other components (for example, one containing ω-amino acid, diamine and dicarboxylic acid as main components (50 mol% or more)). In that case, the molar% of the polyamide component is preferably 80 mol% or more, more preferably 85 mol% or more, and further preferably 90 mol% or more. The upper limit of the polyamide component is the upper limit of a typical copolymer, which is 99 mol% or less. Further, the polyamide may be a polymer blend. In that case, the polyamide component is preferably 70% by mass or more, more preferably 75% by mass or more, and further preferably 80% by mass or more, based on the total mass of the polymer blend (100% by mass). The preferred upper limit of the polyamide component is the upper limit of a typical polymer blend, which is 99% by mass or less.

Examples of the three-membered ring or more lactam include ε-caprolactam, ω-enantractum, ω-laurolactam, α-pyrrolidone and the like. Examples of the polymerizable ω-amino acid include ω-aminocaproic acid, ω-aminoheptanoic acid, ω-aminononanoic acid, ω-aminoundodecanoic acid, and ω-aminododecanoic acid. Examples of the diamine include tetramethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, and 2,2,4-totimethylhexamethylenediamine. , 2,4,4-Totimethylhexamethylenediamine and other aliphatic amines, 1,3 / 1,4-bis (aminomethyl) cyclohexane, isophoronediamine, piperazine, bis (4-aminocyclohexyl) methane, 2,2 Examples thereof include alicyclic diamines such as −bis- (4'-aminocyclohexyl) propane, and aromatic diamines such as metaxylylenediamine and paraximethylenediamine. Examples of the dicarboxylic acid include aliphatic dicarboxylic acids such as glutaric acid, adipic acid, pimeric acid, suberic acid, azelaic acid, sebatic acid, nonandionic acid, decandionic acid, undecandionic acid, and dodecandic acid, and hexahydroterephthalic acid. Alicyclic carboxylic acid such as hexahydroisophthalic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid (1,2-body, 1,3-body, 1,4-body, 1,5-body, 1,6-body) Aromatic dicarboxylic acids such as body, 1,7-body, 1,8-body, 2,3-body, 2,6-body 2,7-body) and metal-isophthalic acid can be mentioned.

In the polyamide resin layer 21, homopolymers or copolymers of polyamides derived from the above-mentioned three-membered ring or more lactam, polymerizable ω-amino acid, diamine and dicarboxylic acid can be used alone or as a mixture. Specifically, polyamide 4, polyamide 6, polyamide 7, polyamide 11, polyamide 12, polyamide 4, 6, polyamide 6, 6, polyamide 6, 9, polyamide 6, 10, polyamide 6, 11, polyamide 6-6 , 6, Polyamide 6-6,10, Polyamide 6-6, 11, Polyamide 6,12, Polyamide 6-6, 12, Polyamide 6-6, 6-6, 10, Polyamide 6-6, 6-12, Polyamide Examples thereof include 6-6, 6-6, 12 and the like. These polyamide-based resins may be homopolymers, copolymers, or mixtures thereof.

Among these, from the viewpoint of pinhole resistance, it is preferable to use polyamide 6, polyamide 6/66, polyamide 6/12, and polyamide 6/66/12 as main components, and among them, polyamide 6 is preferably used. Further, the polyamide resin layer 21 may be provided with two or more layers, and in that case, each layer may be formed of a different type of polyamide resin.

The lower limit of the total thickness of the polyamide resin layer 21 is preferably 10 μm or more, more preferably 15 μm or more, and even more preferably 20 μm or more. The upper limit is preferably 200 μm or less, more preferably 170 μm or less, and even more preferably 150 μm or less. Good pinhole resistance can be obtained by setting the lower limit of the thickness of the polyamide resin layer 21 to 10 μm or more, and good deep drawing moldability can be maintained by setting the upper limit to 200 μm or less.

The heat seal layer 24 has a melting point of 90 ° C. or higher and 120 ° C. or lower, and has a linear low-density polyethylene (LLDPE), an ethylene-vinyl acetate copolymer (EVA), an ethylene-acrylic acid copolymer (EAA), and an ethylene-acrylic acid. Ethylene ethyl copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic acid copolymer The main component is at least one resin selected from the group consisting of a coalesced (EAA) ionomer and an ethylene-methacrylic acid copolymer (EMAA) ionomer. The main component referred to here means that when the heat seal layer 24 contains the plurality of the above resins, the total of these resins is 50% by weight or more.

The heat-sealing layer 24 is preferably set to have a melting point of 90 ° C. or higher to prevent blocking in the winding step during film formation and to prevent sagging or bumps in the rolled appearance of the film. Further, during deep drawing molding, low molecular weight components such as oligomers do not adhere to the molding hot plate, and the deep drawing formability is improved.
On the other hand, by setting the melting point to 120 ° C. or lower, the sealing temperature can be set low or the sealing time can be set short, which is preferable in terms of production capacity and speed. In addition, liquid substances such as seasonings and viscous foods are present as impurities in the sealing portion, and the low temperature sealing property is an important factor for improving the sealing property of the contaminants. By selecting a resin in this range, stable low-temperature heat-sealing properties can be obtained. In addition, since a flexible resin is arranged in the innermost layer, pinhole resistance to bending and twisting movements is improved. A preferable melting point is 95 ° C. or higher and 115 ° C. or lower.

An intermediate layer of at least one ethylene-vinyl alcohol copolymer resin layer (EVOH layer) 22 can be provided for the purpose of imparting oxygen barrier properties. The ethylene content of EVOH used in the EVOH layer 22 is not particularly limited, but from the viewpoint of film formation stability, the lower limit is preferably 32 mol% or more, more preferably 38 mol% or more, and the upper limit is It is preferably 47 mol% or less, more preferably 44 mol% or less. The degree of saponification of EVOH is preferably 90 mol% or more, more preferably 95 mol% or more. By keeping the ethylene content and the degree of saponification of EVOH within the above ranges, the coextrusion property of the film of the present invention and the strength of the film can be improved.

When the EVOH layer 22 is provided, the lower limit of the thickness of the EVOH layer 22 is preferably 5 μm or more, more preferably 8 μm or more, further preferably 10 μm or more, and the upper limit is preferably 30 μm or less, more preferably 25 μm or less, and further. It is preferably 20 μm or less. Sufficient oxygen barrier properties can be obtained by setting the lower limit of the thickness of the EVOH layer 22 to 5 μm. Further, by setting the upper limit value to 30 μm, the coextrusion property of the film is not deteriorated and good film strength can be maintained.

Further, the adhesive resin layer 23 can be provided between the outermost layer 21, the EVOH layer 22, and the heat seal layer 24. Adhesive resins that can be used are low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE) and other polyethylene (PE), and polypropylene (PP) and other olefin-based resins. Resin, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene Ethyl acrylate-maleic anhydride copolymer (EEA-MAH), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene copolymer such as ethylene-based ionomer (ION) A polymerization system resin can be exemplified. In addition, a modified polyolefin resin, for example, an ethylene-vinyl acetate copolymer or an ethylene-based elastomer, a monobasic unsaturated fatty acid such as acrylic acid or methacrylic acid, or maleic acid or fumaric acid. Alternatively, an example obtained by chemically binding an anhydride of a dibasic fatty acid such as itaconic acid can be exemplified. Above all, it is preferable to use an adhesive resin based on polyethylene.

When the adhesive resin layer 23 is provided, the lower limit of the thickness of the adhesive resin layer 23 is preferably 3 μm or more, more preferably 5 μm or more, and further preferably 8 μm or more. The upper limit is not particularly limited, but is preferably 30 μm or less, more preferably 25 μm or less, and even more preferably 20 μm or less. When the thickness of the adhesive resin layer 23 is 3 μm or more, the delamination strength can be improved. Further, by setting the thickness of the adhesive resin layer 23 to 30 μm or less, the total thickness of the flexible member becomes appropriate, which is preferable from the viewpoint of cost.

The outermost layer 21, the intermediate layer 22, and the heat seal layer 24 of the flexible member constituting the container body 20 described above may contain other resins or additives as long as the effects of the present invention are not impaired. it can. For example, additives such as nucleating agents, lubricants, heat-resistant stabilizers, oxidation-resistant stabilizers, weather-resistant stabilizers, ultraviolet absorbers, pigments, and dyes may be appropriately added. In particular, nucleating agents such as organic acid metal salts, inorganic fillers, and sorbitol-based nucleating agents are expected to improve moisture resistance and transparency by promoting the crystallization rate and forming microcrystals, and thus pinhole resistance. It may be added as long as the property and flexibility are not impaired.

Next, a method for manufacturing the flexible member will be described. The flexible member can be manufactured using a known method. For example, an extrusion lamination method, a coextrusion inflation method, a coextrusion T-die method, or the like can be used, and it is preferable to use the coextrusion T-die method for the flexible member. For example, when the flexible member of the present invention is manufactured by the coextrusion T-die method, the raw materials (pellets) used for the outermost layer 21, the intermediate layer 22, and the heat seal layer 24 are filled in an extruder and 180 to 300, respectively. Flexible members can be manufactured by melting at ° C. and coextruding with a T-die. The container body 20 can be manufactured by deep drawing the flexible member. The molding temperature is preferably 130 to 170 ° C., and the molding time is preferably 2 to 4 seconds.

<Manufacturing method of distribution packaging>
The distribution package 100 of the present invention can be manufactured by filling the container 20 with the contents and heat-sealing the lid material 10 with the contents. The heating temperature at the time of sealing is preferably 140 to 180 ° C., and the sealing time is preferably 1 to 2 seconds.

<Use of distribution package 100>
The distribution package 100 of the present invention can be suitably used for storing oily foods. The oil-based food is not particularly limited as long as it is a food containing oil, and examples thereof include dressings containing 5 to 50% oil, and specifically, Japanese-style dressings containing 5 to 15% oil and 30 Italian dressings containing ~ 40% oil can be mentioned. When the oil-based food is stored in the distribution package, conventionally, the oil may permeate into the lid material side and the contents may leak, but in the package 100 of the present invention, the oil-based food is on the lid material side. Since it is prevented from penetrating into the contents, the contents do not leak.

Hereinafter, examples of the present invention will be shown, but the present invention is not limited thereto.
<Material of lid material>
The materials used for producing the lid materials of Examples and Comparative Examples are as follows.
(surface)
A commercially available polyester film made of copolymerized polyester manufactured by Towa Processing Co., Ltd. (product number: SA-70) was printed with gravure in one red color (thickness: 25 μm).
(Middle layer)
HIPS: PSJ-Polystyrene (manufactured by PS Japan Corporation),
GPPS: PSJ-Polystyrene (manufactured by PS Japan Corporation),
EVOH1: Soanol (manufactured by Mitsubishi Chemical Corporation), ethylene content 32 mol%,
EVOH2: Soanol (manufactured by Mitsubishi Chemical Corporation), ethylene content 48 mol%,
(Adhesive resin layer)
Adhesive resin 1: Modified polyolefin resin (Admer NF515, manufactured by Mitsui Chemicals, Inc.), MFR: 3.0 g / 10 minutes (220 ° C, 21.17N),
Adhesive resin 2: Modified polyolefin resin (Admer NF514, manufactured by Mitsui Chemicals, Inc.), MFR: 7.0 g / 10 minutes (220 ° C, 21.17N),
Adhesive resin 3: Modified polyolefin resin (Admer SF625, manufactured by Mitsui Chemicals, Inc.), MFR: 2.3 g / 10 minutes (220 ° C, 21.17N),
(Seal layer)
HDPE: Novatec HD (manufactured by Japan Polyethylene Corporation),

<Example 1>
A lid material was produced by a dry laminating method using a printed polyester film made of copolymerized polyester manufactured by Towa Kako Co., Ltd. and a coextruded film composed of an intermediate layer, an adhesive resin layer (A) and a sealing layer manufactured in advance. The layer structure is as follows.
Copolymerized polyester film (printing) <25 μm> // HIPS (80% by mass) + GPPS (20% by mass) <280 μm> / Adhesive resin layer (B) (Adhesive resin 3, MFR: 2.3 g / 10 minutes) <15 μm >> EVOH1 (ethylene content: 32 mol%) <5 μm> / Adhesive resin layer (A) (Adhesive resin 1, MFR: 3.0 g / 10 minutes) <10 μm> / HDPE <20 μm>

<Example 2>
A lid material having the following layer structure was produced in the same manner as in Example 1 except that the thickness of the PS layer of the intermediate layer was 278 μm and the thickness of the EVOH layer was 7 μm.
Copolymerized polyester film (printing) <25 μm> // HIPS (80% by mass) + GPPS (20% by mass) <278 μm> / Adhesive resin layer (B) (Adhesive resin 3, MFR: 2.3 g / 10 minutes) < 15 μm> / EVOH1 (ethylene content: 32 mol%) <7 μm> / Adhesive resin layer (A) (Adhesive resin 1, MFR: 3.0 g / 10 minutes) <10 μm> / HDPE <20 μm>

<Comparative example 1>
A lid material having the following layer structure was produced in the same manner as in the procedure of Example 1 except that the resin constituting the adhesive resin layer (A) was the adhesive resin 2.
Copolymerized polyester film (printing) <25 μm> // HIPS (80% by mass) + GPPS (20% by mass) <280 μm> / Adhesive resin layer (B) (Adhesive resin 3, MFR: 2.3 g / 10 minutes) < 15 μm> / EVOH1 (ethylene content: 32 mol%) <5 μm> / Adhesive resin layer (A) (Adhesive resin 2, MFR: 7.0 g / 10 minutes) <10 μm> / HDPE <20 μm>

<Comparative example 2>
A lid material having the following layer structure was produced in the same manner as in the procedure of Example 1 except that EVOH1 constituting the EVOH layer of the intermediate layer was changed to EVOH2.
Copolymerized polyester film (printing) <25 μm> // HIPS (80% by mass) + GPPS (20% by mass) <280 μm> / Adhesive resin layer (B) (Adhesive resin 3, MFR: 2.3 g / 10 minutes)) <15 μm> / EVOH2 (ethylene content: 48 mol%) <5 μm> / Adhesive resin layer (A) (Adhesive resin 1, MFR: 3.0 g / 10 minutes) <10 μm> / HDPE <20 μm>
<Comparative example 3>
A lid material having the same layer structure as that of Comparative Example 1 was used.

<Manufacturing of container body>
A container body was manufactured under molding conditions (heating temperature: 150 ° C., heating time: 3 seconds) using a coextruded composite film having the following layer structure as a flexible member.
PA (50 μm) / EVOH (10 μm) / Adhesive resin (10 μm) / LLDPE (80 μm)
PA: NOVACID (manufactured by DSM)
EVOH: Soanol (manufactured by Mitsubishi Chemical Corporation)
Adhesive resin: Admer (manufactured by Mitsui Chemicals, Inc.)
LLDPE: Evolu (manufactured by Prime Polymer Co., Ltd.)

<Manufacturing of distribution packaging>
For each of the Examples and Comparative Examples, the following contents were put into the container body using the above-mentioned lid material and container body, and the distribution package was molded under the following conditions (molding conditions).
Lid molding heating temperature: 160 ° C, lid molding heating time: 2 seconds (seal condition)
Lid / container seal temperature: 160 ° C, lid / container seal time: 2 seconds (contents)
Examples 1-2, Comparative Examples 1-2: Italian dressing (oil content 36%), 15 g / pack Comparative Example 3: Japanese-style dressing (oil content 10%), 15 g / pack

<Performance evaluation test method and evaluation criteria>
Three types of performance evaluation tests described below were performed, and the lid material of the distribution package was evaluated based on a predetermined evaluation standard.
(1) Crackability of plastic sheet The distribution package containing the contents was opened, and the linear crackability of the lid material was evaluated according to the following criteria.
It breaks straight and smoothly without stickiness: 5
It breaks linearly and smoothly: 4
Sticky and hard to crack, but cracks linearly: 3
Does not break linearly: 2
Sticky and hard to break, even if it breaks, it is not straight: 1

(2) Openability (discharge form of contents)
The distribution package containing a total of 50 contents was opened, the direction in which the contents were discharged was observed, and the evaluation was made according to the following criteria.
Discharge according to the aim: 5
90% or more discharges as aimed: 4
More than 50% discharge as aimed: 3
One or more and less than half of those discharged according to the aim: 2
Everything discharges in a direction different from the aim: 1

(3) Leakage of contents after storage A weight of 15 kg was placed on a total of 100 packages, and after standing at 40 ° C. for 24 hours, it was confirmed that there was no leakage of contents.
Content leakage is 0%: ○
Content leakage is 1% or more: ×

<Evaluation result>
The results of the evaluation test are shown in Table 1.

In Comparative Example 1 in which the MFR of the adhesive resin constituting the adhesive resin layer (A) was 7.0 g / 10 minutes, 27% of the contents leaked after storage. This is because the adjacent adhesive resin layer (A) did not suppress the deformation of the EVOH layer at the time of sealing, so that the EVOH layer was locally thinned, so that oil permeated and the PS-based resin layer and the adhesive resin layer ( This is because the layers with B) were delaminated and the contents leaked out.
Further, in Comparative Example 2 in which the ethylene content of EVOH constituting the EVOH layer was high, 3% of the contents leaked after storage. This is because the EVOH layer has a high ethylene content, so that the EVOH layer easily permeates the oil, and the permeated oil delaminates the layers between the PS-based resin layer and the adhesive resin layer (B), and the contents leak out. ..
Further, Comparative Example 3 is an example in which the Japanese-style dressing is stored in the same packaging as in Comparative Example 1, but even in the Japanese-style dressing having less oil content than the Italian dressing, 17% of the contents leaked.
On the other hand, in Examples 1 and 2, all the amounts were discharged according to the standard, and the Italian dressing, which was the content, did not leak after storage. In the packages of Examples 1 and 2, even when the Japanese-style dressing having a low oil content was packaged, the contents did not leak after storage.

As described above, the present invention has been described in relation to the most practical and preferable embodiments at present, but the present invention is limited to the embodiments disclosed in the present specification. Rather, it can be appropriately changed within the scope of the claims and within the scope not contrary to the gist or idea of the invention that can be read from the entire specification, and the distribution package for oily foods accompanied by such a change is also included in the technical scope of the present invention. Must be understood as being done.

10: Lid material 12: Bending line 13: Protruding discharge means 15: Surface layer of lid material (layer containing copolymerized polyester resin)
16: Intermediate layer 16a: Layer containing polystyrene resin 16b: Layer containing ethylene-vinyl alcohol copolymer resin 17: Adhesive resin layer (A) of lid material
18: Seal layer (layer containing polyethylene resin)
12a: Half-cut portion 20: Container body 21: Polyamide resin layer 22: Ethylene-vinyl alcohol copolymer resin layer 23: Adhesive resin layer 24 of container body: Heat seal layer 100: Distribution package

Claims (4)

From a container body composed of a discharge means and a lid material having a bending line in the center portion of the surface, and a flexible member having a peripheral portion fixed to the back surface of the lid material and forming pocket portions on both sides of the bending line. It is a distribution package
The lid material is a surface layer containing a copolymerized polyester resin, at least two layers including a polystyrene resin as an intermediate layer, and a layer containing an ethylene-vinyl acetate copolymer saponified resin, and an adhesive resin layer (A). ), And a seal layer containing a polyethylene-based resin, which satisfies the following (I) to (III) in this order.
(I) The layer containing the polystyrene resin of the intermediate layer is 50% or more of the thickness ratio of the intermediate layer (II) The ethylene content of the ethylene-vinyl acetate copolymer saponified resin is 47 mol% or less. (III) The MFR of the adhesive resin constituting the adhesive resin layer (A) measured at a measurement temperature of 220 ° C. and a measurement load of 21.17 N is 5.0 g / 10 minutes or less. The distribution package for oil-based foods according to claim 1, wherein the polystyrene-based resin is at least one of general-purpose polystyrene, impact-resistant polystyrene, and styrene-butadiene block copolymer. The oily food distribution according to claim 1 or 2, wherein the layer containing the polystyrene-based resin contains 10% by mass or more and 90% by mass or less of any one or more of impact-resistant polystyrene and styrene-butadiene block copolymer. Packaging body. From a container body composed of a discharge means at the center of the surface, a lid material having a bending line, and a flexible member having a peripheral portion fixed to the back surface of the lid material and forming pockets on both sides of the bending line. A laminated film for a lid material for forming a distribution package for oil-based foods.
The laminated film for the lid material includes at least two layers of a surface layer containing a copolymerized polyester resin, a layer containing a polystyrene resin as an intermediate layer, and a layer containing an ethylene-vinyl acetate copolymer saponified resin, and an adhesive resin. A laminated film for a lid material, which comprises a layer (A) and a sealing layer containing a polyethylene resin in this order and satisfies the following (I) to (III).
(I) The layer containing the polystyrene resin of the intermediate layer is 50% or more of the thickness ratio of the intermediate layer (II) The ethylene content of the ethylene-vinyl acetate copolymer saponified resin is 47 mol% or less. (III) The MFR of the adhesive resin constituting the adhesive resin layer (A) measured at a measurement temperature of 220 ° C. and a measurement load of 21.17 N is 5.0 g / 10 minutes or less.