JP2016064865A - Packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material where the presence or absence of foreign matter becoming the sources of the occurrence of pinholes on a heat seal layer and the reduction of the adhesion of a sealant layer by a heat seal is suitably controlled, a production method of the packaging material and a defect inspection method of the packaging material.SOLUTION: In a packaging material consisting of a laminate film laminated with a support 2 and a sealant layer 1 having at least a first sealant layer 11,: foreign matter 5 exists at the inside of the first sealant layer 11; the tip position B of the foreign matter is projected outward from the surface position A at the portion of the first sealant layer 11 where the foreign matter does not exist in the lamination direction of the laminate film; and the thickness Xof the foreign matter from the position A to the position B is 70% or less of the thickness Y of the first sealant layer 11 at a portion where the foreign matter does not exist.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging material, a method for manufacturing the packaging material, and a defect inspection method for the packaging material.

  Conventionally, a packaging material made of a laminated film in which a sealant layer is laminated on a support such as a base material layer or a metal layer has been widely used (see, for example, Patent Document 1). In such a packaging material, the sealant layer is generally formed of a heat-fusible resin, and by sealing the sealant layers located at the peripheral edge of the packaging material to form a bag shape, Various contents such as cosmetics, foods and electrolytes can be sealed.

  Generally, after a packaging material is manufactured as a strip-shaped laminated film, it is cut into a desired size and used for packaging contents. In the production process of the laminated film, as a method of laminating the sealant layer on the support, for example, a method of melt-extruding a resin forming the sealant layer on the support, a resin film forming the sealant layer of the support A method of laminating by the dry laminating method is known.

JP 2008-287971 A

  In the packaging material, since the sealant layer is located in the innermost layer, various contents such as chemicals, cosmetics, foods, and electrolytes are in contact with the sealant layer. Therefore, when a pinhole exists in the sealant layer, the sealing performance of the contents by the packaging material tends to be lowered. In addition, even when the heat sealability of the sealant layer (adhesiveness of the sealant layer by heat seal) is low, the sealing performance of the contents by the packaging material tends to be lowered.

There are various factors that can cause pinholes in the sealant layer of the packaging material or the heat sealability of the sealant layer to deteriorate.For example, if foreign matter exists inside the sealant layer, the manufacturing process of the packaging material In addition, pinholes are generated during the molding process, and heat sealability tends to be reduced. Examples of the foreign material that may exist inside the sealant layer include unmelted material, dust, and metal pieces of the sealant layer.
However, even when foreign matter is present in the sealant layer, pinholes may or may not be generated, adhesion due to heat sealing may or may not be reduced. There has been no clear knowledge of what foreign substances do not cause these occurrences and heat sealability. Therefore, in general, at the packaging material manufacturing site, the sealant layer formed on the laminated film is inspected, and if there is a certain amount of foreign matter, the portion of the laminated film where the foreign matter is present is removed. Yes. However, if there is no clear criteria for removing foreign substances that cause pinholes and heat sealability, these non-causing foreign substances can be removed to reduce yield or remove the foreign substances that cause them. Otherwise, it may become a defective product.

  The present invention has been made in view of the above problems. That is, the present invention provides a packaging material in which the presence or absence of foreign matter that causes pinhole generation and heat sealability is suitably controlled, a method for manufacturing the packaging material, and a defect inspection method for the packaging material. Main purpose.

The present inventors have intensively studied to solve the above problems. As a result, in a packaging material composed of a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated, if foreign matter is present inside the first sealant layer, pinhole generation and heat It has been found that the ease of occurrence of a decrease in adhesion due to the seal does not simply depend on the size of the foreign matter but also greatly depends on the position thereof. And when the inventors repeated further examination, the position B of the tip of the foreign matter is a foreign matter protruding outward from the position A of the surface in the portion where no foreign matter is present in the first sealant layer. When the thickness X _AB of the foreign material from the position A to the position B is 70% or less of the thickness Y of the first sealant layer in the portion where the foreign material does not exist, occurrence of pinholes due to the foreign material or heat sealing It has been found that subsequent adhesion deterioration is unlikely to occur. The present invention has been completed by further studies based on these findings.

That is, this invention provides the invention of the aspect hung up below.
Item 1. A packaging material comprising a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated,
Foreign matter is present inside the first sealant layer,
In the laminating direction of the laminated film, the position B of the tip of the foreign matter protrudes outward from the position A of the surface in the portion where the foreign matter does not exist in the first sealant layer,
The packaging material, wherein the thickness X _{AB of the} foreign material from the position A to the position B is 70% or less of the thickness Y of the first sealant layer in a portion where the foreign material is not present.
Item 2. Item 2. The packaging material according to Item 1, wherein in the sealant layer, a thickness Y of the first sealant layer in a portion where the foreign matter does not exist is 100 µm or less.
Item 3. Item 3. The packaging material according to Item 1 or 2, wherein the thickness of the foreign matter in the thickness direction of the laminated film is 3 µm or more.
Item 4. Item 4. The packaging material according to any one of Items 1 to 3, wherein the laminated film has a thickness of 300 μm or less.
Item 5. Item 5. The packaging material according to any one of Items 1 to 4, wherein the support comprises at least one of a base material layer and a metal layer.
Item 6. Item 6. The packaging material according to any one of Items 1 to 5, wherein the laminated film has a length of 100 m or more and is a wound body wound into a cylindrical shape.
Item 7. Item 7. The packaging material according to any one of Items 1 to 6, wherein the sealant layer further includes a second sealant layer adjacent to the first sealant layer.
Item 8. Inside the first sealant layer, there is a foreign matter having a thickness X _AB of the foreign matter exceeding 70% of the thickness Y of the first sealant layer in a portion where the foreign matter is not present,
Item 8. The packaging material according to any one of Items 1 to 7, wherein a mark is given to the laminated film so that the position of the foreign matter can be recognized.
Item 9. In the first sealant layer, there is no foreign matter in which the foreign matter thickness X _AB exceeds 70% of the thickness Y of the first sealant layer in a portion where the foreign matter is not present. The packaging material according to any one of 7 above.
Item 10. The manufacturing method of the packaging material according to any one of Items 1 to 9,
After obtaining a laminated film by a laminating process including a process of laminating a support and a sealant layer having at least a first sealant layer,
Imaging the surface of the laminated film on the sealant layer side, obtaining unevenness information on the surface of the laminated film caused by the presence of the foreign matter, and
Based on the unevenness information, (1) the foreign matter is present inside the first sealant layer, and (2) the position B of the tip of the foreign matter in the lamination direction of the laminated film is the first Projecting outward from the position A on the surface of the sealant layer where the foreign matter does not exist, and (3) the thickness X _{AB of the} foreign matter from the position A to the position B is present. A step of confirming that it is 70% or less of the thickness Y of the first sealant layer of the portion that has not been done;
A method for producing a packaging material.
Item 11. A defect inspection method for a packaging material comprising a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated,
Imaging the surface of the laminated film on the sealant layer side, obtaining unevenness information on the surface of the laminated film caused by the presence of the foreign matter, and
Based on the unevenness information, (1a) the foreign matter is present in the first sealant layer, and (2a) the position B of the tip of the foreign matter in the lamination direction of the laminated film is the first Projecting outward from the position A on the surface of the sealant layer where the foreign matter does not exist, and (3a) the thickness X _{AB of the} foreign matter from the position A to the position B is present. A step of checking whether or not it is 70% or less of the thickness Y of the first sealant layer of the portion that has not been done;
A defect inspection method for a packaging material.

  According to the present invention, a packaging material in which the presence or absence of foreign matter causing the occurrence of pinholes in the sealant layer and the decrease in the adhesion of the sealant layer by heat sealing is suitably managed, the method for producing the packaging material, and the packaging material It is possible to provide a defect inspection method. Therefore, according to the present invention, it is possible to provide a packaging material in which defects such as occurrence of pinholes and deterioration of the adhesion of the sealant layer are appropriately managed.

In the laminated film which comprises the packaging material which concerns on this invention, it is typical sectional drawing of the thickness direction of the part in which a foreign material exists. In the laminated film which comprises the packaging material which concerns on this invention, it is typical sectional drawing of the thickness direction of the part in which a foreign material exists. In the laminated film which comprises the packaging material which tends to produce the adhesive material fall of the sealant layer by pinhole generation | occurrence | production or heat sealing, it is typical sectional drawing of the thickness direction of the part in which a foreign material exists. In the lamination | stacking which comprises the packaging material which is hard to produce the fall of the adhesiveness of the sealant layer by pinhole generation | occurrence | production or heat sealing, it is typical sectional drawing of the thickness direction of the part in which a foreign material exists.

1. Packaging Material The packaging material of the present invention is a packaging material comprising a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated. In the packaging material, foreign matter is present inside the first sealant layer. Further, for example, as shown in the figure a on the left side of FIG. 1, in the laminating direction of the laminated film, the position B of the front end of the foreign matter is more than the position A of the surface in the portion where the foreign matter does not exist in the first sealant layer. Also protrudes outward. Furthermore, the thickness X _AB of the foreign matter from position A to position B is 70% or less of the thickness Y of the first sealant layer in the portion where no foreign matter is present. Hereinafter, the packaging material of the present invention will be described in detail with reference to FIGS.

Laminated structure of packaging material The packaging material of the present invention comprises a laminated film in which at least a support 2 and a sealant layer 1 are laminated, as shown in FIGS. 1 and 2, for example. In the present invention, the sealant layer 1 is the innermost layer. That is, when the contents are packaged by the packaging material of the present invention, the sealant layers located at the peripheral edge portions of the packaging material are heat-sealed to form a bag and to seal the contents. it can.

  The sealant layer 1 has at least a first sealant layer 11 including the foreign matter 5 described above. The sealant layer 1 may be composed of only one layer of the first sealant layer 11, and other sealant layers such as the second sealant layer 12 and the third sealant layer 13 may be added to the first sealant layer 11. Furthermore, you may be comprised by the several layer which has.

  For example, the laminated structure a shown on the left side of FIGS. 1 and 2 is a schematic cross-sectional view of a packaging material when the sealant layer 1 has only the first sealant layer 11. 1 and FIG. 2, the laminated structures of b and c shown in FIG. 1 and FIG. 2 include a sealant layer 1 having a first sealant layer 11 and a second sealant layer adjacent to the first sealant layer 11, respectively. 1 is a schematic cross-sectional view of a packaging material for the case of having 12; 1 and 2, the first sealant layer 11 is located in the innermost layer of the packaging material. On the other hand, in the laminated structure c shown in the lower side of FIGS. 1 and 2, the second sealant layer 12 is laminated on the side where the foreign matter protrudes from the first sealant layer 11, and the second sealant layer 12 is Located in the innermost layer of the packaging material.

  Moreover, as a layer which comprises the support body 2, the base material layer 21, the metal layer 22, etc. are mentioned, for example. The support 2 may be composed of only one layer or may be composed of a plurality of layers. Moreover, when the support body 2 has the base material layer 21 and the metal layer 22, the packaging material of this invention is the base material layer 21, the metal layer 22, and the sealant layer 1, as FIG.1 and FIG.2 shows. It is preferable to laminate in order. When the support 2 has the base material layer 21 and the metal layer 22, for the purpose of improving the adhesiveness between the base material layer 21 and the metal layer 22, an adhesive layer A is provided between these layers as necessary. (Not shown) may be provided. Moreover, between these layers (for example, between the base material layer 21 and the sealant layer 1, between the metal layer 22 and the sealant layer 1 for the purpose of improving the adhesion between the support 2 and the sealant layer 1, etc. An adhesive layer B (not shown) may be provided as needed.

  The length of the laminated film constituting the packaging material of the present invention is not particularly limited. The laminated film is usually produced as a belt having a length of, for example, about 100 m or more, preferably about 100 to 5000 m, and is used after being cut into a desired size according to the size of the contents. The width of the laminated film is, for example, about 0.01 to 1 m, preferably about 0.1 to 1 m. The thickness of the laminated film is, for example, 300 μm or less, preferably about 50 to 200 μm, and more preferably about 50 to 150 μm. The packaging material of the present invention may be a wound body in which a belt-shaped laminated film is wound into a cylindrical shape. In the wound body, the diameter of the circular cross section in the direction perpendicular to the width direction of the laminated film is preferably 100 mm or more, more preferably 150 mm or more. In addition, the upper limit value of the diameter of the circular section is usually about 1000 mm.

Composition of each layer of packaging material [sealant layer 1]
In the packaging material of the present invention, the sealant layer 1 is a layer constituting the innermost layer of the packaging material when the contents are sealed with the packaging material. When sealing the contents, the surfaces of the sealant layer 1 can be brought into contact with each other, and the contacted portions can be heat-sealed to seal the contents.

  The sealant layer 1 is preferably formed of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin, cyclic polyolefin, carboxylic acid-modified polyolefin, carboxylic acid-modified cyclic polyolefin, and the like.

  Specific examples of polyolefins include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene; homopolypropylene, polypropylene block copolymers (for example, block copolymers of propylene and ethylene), polypropylene Crystalline or amorphous polypropylene such as random copolymers (eg, random copolymers of propylene and ethylene); ethylene-butene-propylene terpolymers, and the like. Among these polyolefins, polyethylene and polypropylene are preferable.

  Cyclic polyolefin is a copolymer of olefin and cyclic monomer. Examples of the olefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. Examples of the cyclic monomer include cyclic alkenes such as norbornene; cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, norbornadiene, and the like. Among these polyolefins, a cyclic alkene is preferable, and norbornene is more preferable.

  A carboxylic acid-modified polyolefin is a polymer obtained by modifying a polyolefin with a carboxylic acid. Examples of the carboxylic acid used for modification include maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, itaconic anhydride and the like.

  The carboxylic acid-modified cyclic polyolefin is a copolymer obtained by copolymerizing a part of the monomer constituting the cyclic polyolefin in place of the α, β-unsaturated carboxylic acid or its acid anhydride, or α, β with respect to the cyclic polyolefin. -A polymer obtained by block polymerization or graft polymerization of an unsaturated carboxylic acid or its acid anhydride. The cyclic polyolefin to be modified with carboxylic acid can be the same as the above cyclic polyolefin. The carboxylic acid used for modification can be the same as that used for modification of the acid-modified cycloolefin copolymer.

  Among these thermoplastic resins, preferably crystalline or amorphous polyolefins, cyclic polyolefins, and blended polymers thereof; more preferably polyethylene, polypropylene, copolymers of ethylene and norbornene, and two of them The above blend polymer is mentioned.

  The sealant layer 1 may be formed from only one type of resin component, or may be formed from a blend polymer in which two or more types of resin components are combined. Furthermore, as described above, the sealant layer 1 may be formed of only one layer of the first sealant layer 11 or may be formed of two or more layers using the same or different resin components.

  Although it does not restrict | limit especially as total thickness of the sealant layer 1, For example, about 5 micrometers-200 micrometers, Preferably it is 10 micrometers-200 micrometers, More preferably, it can be 10 micrometers-100 micrometers. In addition, the thickness of the sealant layer 1 is a thickness of a portion where the foreign matter is not present.

In the present invention, the sealant layer 1 has a first sealant layer 11 in which foreign matter 5 exists. For example, as shown in FIGS. 1 and 2, the position B of the tip of the foreign material 5 is outside the position A of the surface in the portion where the foreign material 5 of the first sealant layer 11 does not exist in the lamination direction of the laminated film. Protruding. And in this invention, thickness X _AB of the foreign material 5 from the position A to the position B is 70% or less of the thickness Y of the 1st sealant layer 11 of the part in which the foreign material 5 does not exist, It is characterized by the above-mentioned. . The packaging material according to the present invention satisfies the requirement that the thickness X _AB is 70% or less of the thickness Y despite the presence of the foreign matter 5 protruding from the first sealant layer 11. It has a feature that the sealant layer adhesion due to the occurrence of pinholes or heat sealing (hereinafter, sometimes simply referred to as “heat sealing property”) is hardly lowered.

On the other hand, for example, as shown in FIG. 3, the position B at the tip of the foreign material 50 is a portion where the foreign material 50 of the first sealant layer 110 is not present in the stacking direction of the laminated film constituting the packaging material. When protruding from the position A on the surface, the thickness X _AB of the foreign material 50 from the position A to the position B exceeds 70% of the thickness Y of the first sealant layer 110 in the portion where the foreign material 50 is not present. Even if the foreign matter 5 and the foreign matter 50 are the same size, pinholes are likely to be generated by the foreign matter 50 and heat sealability is likely to be reduced. For this reason, when such a foreign substance 50 exists in the sealant layer of the packaging material, it is necessary to remove the foreign substance 50 in a manufacturing process or the like.

In the packaging material of the present invention, although the foreign material 5 protruding from the first sealant layer 11 is present, the above requirements are satisfied, so that the generation of pinholes due to the foreign material 5 and heat sealing are performed. Although it is not clear the details that it is difficult to cause a decline in sex, it can be considered as follows. First, when the sealant layer 11 where the foreign material 5 exists is located in the innermost layer of the packaging materials a and b as in the packaging materials a and b of FIGS. 1 and 2, the thickness of the foreign material 5 from the position A to the position B is as follows. When X _AB is 70% or less of the thickness Y of the first sealant layer 11 in the portion where the foreign material 5 does not exist, the first sealant layer 11 located above the position B at the tip of the foreign material 5 is sufficient. Therefore, the foreign matter 5 is difficult to be exposed to the outside of the sealant layer 1. For this reason, it is possible to suppress moisture, contents, and the like from passing through the sealant layer 1 through the interface between the foreign material 5 and the sealant layer 1 generated when the foreign material 5 is exposed to the outside of the sealant layer 5. In addition, even when the packaging material is heat-sealed in a portion where the foreign material 5 is present, it is possible to suppress the first sealant layer 11 from being thinned and the adhesion due to heat sealing from being reduced. Furthermore, when the 2nd sealant layer 12 etc. are laminated | stacked on the innermost layer side of the 1st sealant layer 11, like the packaging material c of FIG.1 and FIG.2, the foreign material which protrudes from the 1st sealant layer 11 5 also ensures a sufficient thickness of the second sealant layer 12, so that when the packaging material c is heat-sealed at the portion where the foreign material 5 is present, the second sealant layer 12 is thinned and adhered by heat sealing. It can suppress that property falls.

For example, in the packaging materials a and b in FIG. 1, the first sealant layer 11 includes a foreign material 5 larger than the packaging materials shown in the packaging materials a and b in FIG. 2, but the thickness X _AB is Since it is 70% or less of the thickness Y, in any of the packaging materials a and b shown in FIGS. On the other hand, in the packaging materials shown in FIGS. 3A and 3B, the size of the foreign matter is the same as that in FIG. 1, but the thickness X _AB exceeds 70% of the thickness Y. Is likely to occur.

Similarly, in the packaging material c of FIG. 1, the foreign material 5 larger than the packaging material c of FIG. 2 is included in the first sealant layer 11, but the thickness X _AB is 70 of the thickness Y. % Or less, it is difficult for the foreign matter 5 to deteriorate the heat sealability. On the other hand, in the packaging material c in FIG. 3, the size of the foreign matter is the same as that in FIG. 1, but the thickness X _AB exceeds 70% of the thickness Y, so that the heat sealability is likely to be deteriorated by the foreign matter 50. .

  When the foreign material 51 does not protrude from the first sealant layer 11 as in the packaging materials a to c as shown in FIG. 4, for example, the foreign material 5 of the packaging material of FIG. 1 or the packaging material of FIG. Even if the size of the foreign material 50 and the foreign material 51 of the packaging material of FIG. 4 are the same, the foreign material 51 of the packaging material of FIG. 4 is unlikely to cause pinholes or a decrease in heat sealability. In addition, when the foreign matter 51 does not protrude from the first sealant layer 11, the unevenness of the surface of the laminated film caused by the foreign matter 51 is small, so that pinholes are generated and heat sealability is reduced due to the defect inspection method described later. It is difficult to be judged as a foreign object.

  In the sealant layer 1, the thickness Y of the first sealant layer 11 in the portion where the foreign material 5 does not exist is not particularly limited, but is usually 200 μm or less, and pinholes are generated while suppressing an increase in the thickness of the packaging material. From the viewpoint of more effectively suppressing the decrease in heat sealability, it is preferably about 5 to 200 μm, more preferably about 10 to 100 μm.

  In the packaging material of the present invention, the thickness of the foreign material 5 in the thickness direction of the laminated film is usually 3 μm or more, and preferably 3 to 3 from the viewpoint of more effectively suppressing the occurrence of pinholes and heat sealability. About 100 micrometers is mentioned, More preferably, about 3-50 micrometers is mentioned. Although it does not specifically limit as the foreign material 5, Generally, they are a dust, a metal piece, the unmelted resin of the resin which forms the sealant layer 1, an oligomer, carbide, etc.

In the packaging material of the present invention, foreign matter having a foreign matter thickness X _AB exceeding 70% of the thickness Y of the first sealant layer 11 in a portion where no foreign matter is present exists in the first sealant layer 11. Preferably not. As described above, the foreign matter causes pinholes or decreases heat sealability. If such foreign matter exists when the first sealant layer 11 is formed, the portion of the laminated film where the foreign matter is present can be removed. In addition, the packaging material of this invention may cut the laminated | multilayer film in the width direction so that such a foreign material may be located, and may connect the laminated | multilayer film with a tape etc.

Further, in the packaging material of the present invention, foreign matter having a foreign matter thickness X _AB exceeding 70% of the thickness Y of the first sealant layer in a portion where no foreign matter is present exists in the first sealant layer 11. The mark may be given to the laminated film so that the position of the foreign matter can be recognized. In order to recognize the position of such a foreign matter, the position of the foreign matter is managed by providing a mark on the laminated film. Specifically, after manufacturing the belt-like laminated film by laminating each layer constituting the packaging material of the present invention, by using the defect inspection method described later, etc., so that the position of such foreign matter can be recognized, By assigning a mark to the laminated film, the position of the foreign matter present in the packaging material can be managed. Therefore, in the packaging material of the present invention, the position of a defect caused by such a foreign substance can be easily recognized. As described above, when such foreign matter is present, the portion of the laminated film where the foreign matter is present can be removed in accordance with the information of the mark attached in advance, and the packaging material can be formed in a desired size. When cut into pieces and used for packaging the contents, the contents can be packaged while avoiding the defective portion. The mark attached so that the position of the foreign object can be recognized may be provided on the foreign object or may be provided in the vicinity of the foreign object. Moreover, such a mark can be provided using, for example, ink.

[Support 2]
As above-mentioned, as a layer which comprises the support body 2, the base material layer 21, the metal layer 22, etc. are mentioned. Further, an adhesive layer A, an adhesive layer B, or the like may be included. Hereinafter, these layers will be described in detail.
(Base material layer 21)
In the packaging material, the base material layer 21 that can be included as the support 2 is a layer that is provided as necessary and serves as a base material for the packaging material. The material for forming the base material layer 21 is not particularly limited. Examples of the material for forming the base material layer 21 include resins such as polyester, polyamide, epoxy, acrylic, fluororesin, polyurethane, silicon resin, phenol, polyetherimide, polyimide, and a mixture or copolymer thereof. It is done.

  Specific examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, copolymerized polyester mainly composed of ethylene terephthalate, butylene terephthalate as a repeating unit. Examples thereof include a copolymer polyester mainly used. The copolymer polyester mainly composed of ethylene terephthalate is a copolymer polyester that polymerizes with ethylene isophthalate mainly composed of ethylene terephthalate (hereinafter, polyethylene (terephthalate / isophthalate)). Abbreviated), polyethylene (terephthalate / isophthalate), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate) And polyethylene (terephthalate / decanedicarboxylate). In addition, as a copolymer polyester mainly composed of butylene terephthalate as a repeating unit, specifically, a copolymer polyester that polymerizes with butylene isophthalate having butylene terephthalate as a repeating unit (hereinafter referred to as polybutylene (terephthalate / isophthalate)). For example), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), polybutylene naphthalate and the like. These polyesters may be used individually by 1 type, and may be used in combination of 2 or more type. Polyester has the advantage of being excellent in resistance to contents such as chemicals, chemicals, cosmetics, foods, and electrolytes, and is suitably used as a material for forming the base material layer 21.

  Specific examples of polyamides include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and nylon 6,6; terephthalic acid and / or Nylon 6I, Nylon 6T, Nylon 6IT, Nylon 6I6T (I represents isophthalic acid, T represents terephthalic acid) and the like, which include a structural unit derived from isophthalic acid, Aromatic polyamides such as silylene adipamide (MXD6); alicyclic polyamides such as polyaminomethylcyclohexyl adipamide (PACM6); and lactam components and isocyanate components such as 4,4′-diphenylmethane-diisocyanate. Polymerized polyamide, co-weight Polyester amide copolymer and polyether ester amide copolymer is a copolymer of polyamide and polyester and polyalkylene ether glycol; copolymers thereof, and the like. These polyamides may be used individually by 1 type, and may be used in combination of 2 or more type. The stretched polyamide film is excellent in stretchability, can prevent whitening due to resin cracking of the base material layer 21 during molding, and is suitably used as a material for forming the base material layer 21.

  The base material layer 21 may be formed of a uniaxially or biaxially stretched resin film, or may be formed of an unstretched resin film. Among them, a uniaxially or biaxially stretched resin film, in particular, a biaxially stretched resin film has improved heat resistance due to orientation crystallization, and thus is suitably used as the base material layer 21.

  Among these, as a resin film which forms the base material layer 21, Preferably nylon and polyester, More preferably, biaxially stretched nylon, biaxially stretched polyester, Most preferably, biaxially stretched nylon is mentioned.

  In order to improve the pinhole resistance of the packaging material, the base material layer 21 can also be laminated with resin films of different materials. Specific examples include a multilayer structure in which a polyester film and a nylon film are laminated, and a multilayer structure in which a biaxially stretched polyester and a biaxially stretched nylon are laminated. When making the base material layer 21 into a multilayer structure, each resin film may be adhere | attached through an adhesive agent, and may be laminated | stacked directly without an adhesive agent. In the case of bonding without using an adhesive, for example, a method of bonding in a hot melt state such as a co-extrusion method, a sand lamination method, or a thermal laminating method can be mentioned. Moreover, when making it adhere | attach through an adhesive agent, the adhesive agent to be used may be a two-component curable adhesive, or a one-component curable adhesive. Further, the bonding mechanism of the adhesive is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a hot pressure type, an electron beam curing type such as UV and EB, and the like. As an adhesive component, polyester resin, polyether resin, polyurethane resin, epoxy resin, phenol resin resin, polyamide resin, polyolefin resin, polyvinyl acetate resin, cellulose resin, (meth) acrylic resin Resins, polyimide resins, amino resins, rubbers, and silicon resins can be used.

  Although the thickness in particular of the base material layer 21 is not restrict | limited, For example, about 5 micrometers-50 micrometers, Preferably it can be set as about 12 micrometers-30 micrometers.

(Metal layer 22)
In the packaging material, the metal layer 22 that can be included as the support 2 is provided as necessary to improve the strength of the packaging material and to allow water vapor, oxygen, light, etc. to enter the interior sealed by the packaging material. It is a layer that functions as a barrier layer for prevention. Specific examples of the metal constituting the metal layer 22 include aluminum, stainless steel, and titanium, and preferably aluminum. The metal layer 22 can be formed by metal foil, metal vapor deposition, or the like, preferably by metal foil, and more preferably by aluminum foil. From the viewpoint of preventing generation of wrinkles and pinholes in the metal layer 22 during the production of the packaging material, for example, it is formed of a soft aluminum foil such as annealed aluminum (JIS A8021P-O, JIS A8079P-O). It is more preferable.

  The thickness of the metal layer 22 is not particularly limited, but can be, for example, about 10 μm to 200 μm, preferably about 20 μm to 100 μm.

  The metal layer 22 is preferably subjected to chemical conversion treatment on at least one surface, preferably both surfaces, for the purpose of stabilizing adhesion, preventing dissolution and corrosion, and the like. Here, the chemical conversion treatment refers to a treatment for forming an acid-resistant film on the surface of the metal layer. As the chemical conversion treatment, for example, chromate chromate using chromic acid compounds such as chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromic acetyl acetate, chromium chloride, potassium sulfate chromium, etc. Treatment; Phosphoric acid chromate treatment using a phosphoric acid compound such as sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid; aminated phenol having a repeating unit represented by the following general formulas (1) to (4) Examples include chromate treatment using a polymer.

In general formulas (1) to (4), X represents a hydrogen atom, a hydroxyl group, an alkyl group, a hydroxyalkyl group, an allyl group or a benzyl group. R ¹ and R ² are the same or different and each represents a hydroxyl group, an alkyl group, or a hydroxyalkyl group. In the general formulas (1) to (4), examples of the alkyl group represented by X, R ¹ and R ² include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, C1-C4 linear or branched alkyl groups, such as a tert- butyl group, are mentioned. Examples of the hydroxyalkyl group represented by X, R ¹ and R ² include a hydroxymethyl group, a 1-hydroxyethyl group, a 2-hydroxyethyl group, a 1-hydroxypropyl group, a 2-hydroxypropyl group, 3- C1-C4 straight or branched chain in which one hydroxy group such as hydroxypropyl group, 1-hydroxybutyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group is substituted An alkyl group is mentioned. In the general formulas (1) to (4), the alkyl group and hydroxyalkyl group represented by X, R ¹ and R ² may be the same or different. In the general formulas (1) to (4), X is preferably a hydrogen atom, a hydroxyl group or a hydroxyalkyl group. The number average molecular weight of the aminated phenol polymer having the repeating units represented by the general formulas (1) to (4) is preferably, for example, 500 to 1,000,000, more preferably about 1,000 to 20,000. preferable.

  Further, as a chemical conversion treatment method for imparting corrosion resistance to the metal layer 22, a phosphoric acid is coated with a metal oxide such as aluminum oxide, titanium oxide, cerium oxide, tin oxide, or barium sulfate fine particles dispersed therein, A method of forming a corrosion-resistant treatment layer on the surface of the metal layer 22 by performing a baking treatment at 150 ° C. or higher can be mentioned. Further, a resin layer obtained by crosslinking a cationic polymer with a crosslinking agent may be further formed on the corrosion-resistant treatment layer. Here, examples of the cationic polymer include polyethyleneimine, an ionic polymer complex composed of a polymer having polyethyleneimine and a carboxylic acid, a primary amine graft acrylic resin obtained by graft polymerization of a primary amine on an acrylic main skeleton, and polyallylamine. Or the derivative, aminophenol, etc. are mentioned. As these cationic polymers, only one type may be used, or two or more types may be used in combination. Examples of the crosslinking agent include a compound having at least one functional group selected from the group consisting of an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group, and a silane coupling agent. As these crosslinking agents, only one type may be used, or two or more types may be used in combination.

  As the chemical conversion treatment, only one type of chemical conversion treatment may be performed, or two or more types of chemical conversion treatment may be performed in combination. Furthermore, these chemical conversion treatments may be carried out using one kind of compound alone, or may be carried out using a combination of two or more kinds of compounds. Among the chemical conversion treatments, chromic acid chromate treatment, chromate treatment combining a chromic acid compound, a phosphoric acid compound, and an aminated phenol polymer are preferable.

The amount of the acid-resistant film formed on the surface of the metal layer 22 in the chemical conversion treatment is not particularly limited. For example, in the case of performing the above chromate treatment, a chromic acid compound is present per 1 m ² of the surface of the metal layer 22. About 0.5 mg to about 50 mg, preferably about 1.0 mg to about 40 mg in terms of chromium, about 0.5 mg to about 50 mg, preferably about 1.0 mg to about 40 mg in terms of phosphorus, and aminated phenol weight It is desirable that the coalescence is contained at a ratio of about 1 mg to about 200 mg, preferably about 5.0 mg to 150 mg.

  In the chemical conversion treatment, a solution containing a compound used for forming an acid-resistant film is applied to the surface of the metal layer by a bar coating method, a roll coating method, a gravure coating method, an immersion method, or the like, and then the temperature of the metal layer is 70. It is carried out by heating so as to have a temperature of from about 0C to about 200C. Further, before the chemical conversion treatment is performed on the metal layer, the metal layer may be previously subjected to a degreasing treatment by an alkali dipping method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid cleaning method, or the like. By performing the degreasing treatment in this way, it becomes possible to more efficiently perform the chemical conversion treatment on the surface of the metal layer.

(Adhesive layer A)
In the packaging material, the adhesive layer A that can be included in the support 2 is a layer provided as necessary for the purpose of increasing the adhesive strength between the base material layer 21 and the metal layer 22.

  The adhesive layer A is formed of an adhesive that can bond the base material layer 21 and the metal layer 22. The adhesive used for forming the adhesive layer A may be a two-component curable adhesive or a one-component curable adhesive. Further, the adhesive mechanism of the adhesive used for forming the adhesive layer A is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a hot pressure type, and the like.

  Specific examples of the resin component of the adhesive that can be used to form the adhesive layer A include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, and copolyester. Resin; Polyether adhesive; Polyurethane adhesive; Epoxy resin; Phenol resin resin; Polyamide resin such as nylon 6, nylon 66, nylon 12, copolymer polyamide; polyolefin, acid-modified polyolefin, metal-modified polyolefin, etc. Polyolefin resin; polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; urea resin, melamine resin and other amino resins; chloroprene rubber, nitrile rubber, styrene - rubbers such as butadiene rubber, silicone resin; fluorinated ethylene propylene copolymer, and the like. These adhesive components may be used individually by 1 type, and may be used in combination of 2 or more type. The combination mode of two or more kinds of adhesive components is not particularly limited. For example, as the adhesive component, a mixed resin of polyamide and acid-modified polyolefin, a mixed resin of polyamide and metal-modified polyolefin, polyamide and polyester, Examples thereof include a mixed resin of polyester and acid-modified polyolefin, and a mixed resin of polyester and metal-modified polyolefin. Among these, it has excellent spreadability, durability under high humidity conditions, anti-hypertensive action, heat deterioration-preventing action during heat sealing, etc., and suppresses a decrease in lamination strength between the base material layer 21 and the metal layer 22. From the viewpoint of effectively suppressing the occurrence of delamination, a polyurethane two-component curable adhesive; polyamide, polyester, or a blended resin of these with a modified polyolefin is preferable.

  Further, the adhesive layer A may be multilayered with different adhesive components. When the adhesive layer A is multilayered with different adhesive components, from the viewpoint of improving the lamination strength between the base material layer 21 and the metal layer 22, the adhesive component disposed on the base material layer 21 side is used as the base material layer 21. It is preferable to select a resin having excellent adhesion to the metal layer 22 and selecting an adhesive component having excellent adhesion to the metal layer 22 as the adhesive component disposed on the metal layer 22 side. When the adhesive layer A is multilayered with different adhesive components, specifically, the adhesive component disposed on the metal layer 22 side is preferably an acid-modified polyolefin, a metal-modified polyolefin, a polyester and an acid-modified polyolefin. And a resin containing a copolyester.

  About the thickness of the contact bonding layer A, 2-50 micrometers, for example, Preferably 3-25 micrometers is mentioned.

(Adhesive layer B)
In the packaging material, an adhesive layer is provided between the support 2 (for example, the base material layer 21 and the metal layer 22) and the sealant layer 1 for the purpose of firmly bonding the support 2 and the sealant layer 1 or the like. B may be further provided.

  The adhesive layer B is formed of an adhesive component that can adhere the base material layer 21, the metal layer 22, and the like that can be included as the support 2 and the sealant layer 1. The adhesive used for forming the adhesive layer B may be a two-component curable adhesive or a one-component curable adhesive. Further, the adhesion mechanism of the adhesive component used for forming the adhesive layer B is not particularly limited, and examples thereof include a chemical reaction type, a solvent volatilization type, a heat melting type, and a hot pressure type.

  Specific examples of the adhesive component that can be used to form the adhesive layer B include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, and copolyester; polyether Polyurethane adhesives; epoxy resins; phenol resin resins; polyamide resins such as nylon 6, nylon 66, nylon 12, copolymer polyamides; polyolefins such as polyolefins, carboxylic acid modified polyolefins, metal modified polyolefins Resin, polyvinyl acetate resin; cellulose adhesive; (meth) acrylic resin; polyimide resin; urea resin, melamine resin and other amino resins; chloroprene rubber, nitrile rubber, - styrene rubbers such as butadiene rubber; and silicone resins. These adhesive components may be used alone or in combination of two or more.

  The thickness of the adhesive layer B is not particularly limited, but is preferably about 1 μm to 40 μm, for example, and more preferably about 2 μm to 30 μm.

2. Production method of packaging material The production method of the packaging material of the present invention is not particularly limited as long as the support material 2 and the sealant layer 1 are laminated and the packaging material having the foreign matter 5 is obtained. For example, the following method is used. Can be illustrated.

  First, a laminated film is obtained by a laminating process including a process of laminating the support 2 and the sealant layer 1 having at least the first sealant layer 11. For example, if the support 2 has the base material layer 21 and the metal layer 22, a laminated film is obtained by the following laminating steps. First, the base material layer 21 and the metal layer 22 are laminated. This lamination can be performed by, for example, a dry lamination method using the above-described adhesive component that forms the adhesive layer A or the like. Moreover, as a method of laminating the base material layer 21 and the metal layer 22, a method of extruding a resin for forming the base material layer 21 on the surface of the metal layer 22, or a metal on one surface of the base material layer 21. The method etc. which form the metal layer 22 by vapor-depositing can also be mentioned. Next, the sealant layer 1 is laminated on the metal layer 22. The sealant layer 1 can be formed by, for example, melt extrusion of a thermoplastic resin or a dry lamination method. For the purpose of increasing the adhesive strength between the metal layer 22 and the sealant layer 1, an adhesive component for forming the adhesive layer A is applied on the metal layer 22 as necessary, dried, and then from above. The sealant layer 1 may be formed. In the case where the sealant layer 1 further includes another sealant layer such as the second sealant layer 12 in addition to the first sealant layer 11, the first sealant layer 11 and the other sealant layer may be a coextrusion method or the like. They can be laminated by a known method.

  In order to improve the adhesiveness of each layer in the obtained laminated film, an aging treatment or the like may be performed. The aging treatment can be performed, for example, by heating the laminated film at a temperature of about 30 to 100 ° C. for 1 to 200 hours. Furthermore, in order to further improve the adhesion of each layer in the obtained laminated film, the obtained laminated film may be heated at a temperature equal to or higher than the melting point of the sealant layer 1. The temperature at this time is preferably the melting point of the sealant layer 1 + 5 ° C. or higher and the melting point + 100 ° C. or lower, more preferably the melting point + 10 ° C. or higher and the melting point + 80 ° C. or lower. In the present invention, the melting point of the sealant layer refers to an endothermic peak temperature in differential scanning calorimetry of the resin component constituting the sealant layer. Heating in the aging treatment and heating above the melting point of the sealant layer 1 can be performed by, for example, a hot roll contact method, a hot air method, a near or far infrared method, and the like.

  In the packaging material, each layer constituting the laminated film may improve or stabilize the film forming property, lamination processing, final product secondary processing (pouching, embossing) suitability, etc. as necessary. Surface activation treatment such as corona treatment, blast treatment, oxidation treatment, and ozone treatment may be performed.

Next, the surface of the obtained laminated film on the side of the sealant layer 1 is imaged, and a step of acquiring unevenness information on the surface of the laminated film caused by the presence of the foreign material 5 is performed. Furthermore, the following items (1) to (3) are confirmed based on the unevenness information.
(1) Foreign matter is present inside the first sealant layer 11.
(2) In the laminating direction of the laminated film, the position B of the front end of the foreign matter protrudes outside the position A of the surface of the first sealant layer 11 where no foreign matter is present.
(3) The thickness X _AB of the foreign matter from position A to position B is 70% or less of the thickness Y of the first sealant layer in the portion where no foreign matter is present.

  These items (1) to (3) can be performed, for example, by using a known defect inspection apparatus used for defect inspection such as fish eye in a film. A commercial item can be used as such a defect inspection apparatus. Specifically, it can be confirmed as follows.

When the 1st sealant layer 11 in which a foreign material exists exists in an outermost surface, an unevenness | corrugation arises in the surface of the part in which the foreign material of the 1st sealant layer 11 exists. In the case of (2) above, the irregularities are convex at the foreign matter portion and concave at the outer peripheral portion of the foreign matter. Further, when the thickness X _AB of the foreign matter from the position A to the position B is increased, the unevenness drop is increased. Next, the surface of the laminated film on the sealant layer 1 side is imaged with a camera or the like. At this time, when the captured image is displayed in black and white, the concave portion becomes a shadow, so the color becomes black and the convex portion is displayed in white. Since there is a correlation between the black-and-white difference and the difference between the concave and convex portions of the concave and convex portions, the distance from the position A to B of the foreign matter can be measured. Next, the laminated film is cut in the thickness direction at a location where it is determined that foreign matter is present, and it is confirmed that the above is (3) with a scanning electron microscope or the like. It is possible to confirm the above (1) to (3) in a non-destructive manner by repeating the comparison between the evaluation based on the unevenness information and the information actually cut and confirmed, based on the evaluation based only on the unevenness information. Become. In addition, when the second sealant layer 12 is present on the first sealant layer 11 where foreign matter is present (the packaging material c in each figure), oil having the same refractive index as that of the second sealant layer 12 is placed between the lens of the laser microscope. A foreign object is observed in a state where there is no air dropped on the glass. At that time, by taking an image of the foreign matter portion while shifting the focus, it is possible to create a stereoscopic image of the foreign matter and measure the positions A to B of the foreign matter.

As described above, in the packaging material of the present invention, it is assumed that no foreign matter having a foreign matter thickness X _AB exceeding 70% of the thickness Y of the first sealant layer 11 is present in the first sealant layer 11. In this case, the foreign matter may be removed from the laminated film in accordance with the above unevenness information. At this time, the part where such a foreign substance is located may be cut out and removed only in that part or its periphery, or the laminated film is cut in the width direction including the part where the foreign substance is located, It may be connected with tape.

In addition, as described above, in the packaging material of the present invention, the foreign matter having a thickness X _AB exceeding 70% of the thickness Y exists in the first sealant layer 11, and the position of the foreign matter is recognized. When it is assumed that a mark is attached to the laminated film, a mark applying step for applying a mark to the laminated film may be performed so that the position of the foreign matter can be recognized according to the above unevenness information. The mark attached so that the position of the foreign object can be recognized may be provided on the foreign object or in the vicinity of the foreign object. Moreover, such a mark can be provided using, for example, ink.

  Moreover, when using the packaging material of this invention as a winding body, what is necessary is just to wind up the laminated | multilayer film manufactured in strip | belt shape in a cylindrical shape using a well-known film winder.

3. Packaging Material Defect Inspection Method The packaging material defect inspection method of the present invention (hereinafter sometimes simply referred to as “defect inspection method”) is a laminate of a support 2 and a sealant layer 1 having at least a first sealant layer 11. A method for inspecting a defect of a packaging material made of a laminated film, wherein the surface of the laminated film on the side of the sealant layer 1 is imaged to obtain unevenness information on the surface of the laminated film caused by the presence of foreign matter. Furthermore, the following items (1a) to (3a) are confirmed based on the unevenness information.
(1a) Foreign matter is present inside the first sealant layer 11.
(2a) In the laminating direction of the laminated film, the position B of the tip of the foreign matter protrudes outside the position A of the surface in the portion where the foreign matter does not exist in the first sealant layer.
(3a) Whether or not the thickness X _AB of the foreign matter from position A to position B is 70% or less of the thickness Y of the first sealant layer in the portion where no foreign matter is present.

  These items can be confirmed by using a known defect inspection apparatus used for defect inspection of, for example, fish eyes in a film in the same manner as in the above (1) to (3).

In the defect inspection method of the present invention, the configuration of the packaging material used for the inspection is the same as the configuration of the packaging material of the present invention described above. However, as described above, in the sealant layer 1 in the packaging material of the present invention, foreign matter is present inside the first sealant layer, and the position B of the tip of the foreign matter in the laminating direction of the laminated film is The first sealant layer protrudes outward from the surface position A in the portion where the foreign matter does not exist, and the thickness X _AB of the foreign matter from the position A to the position B is the portion where the foreign matter does not exist. While the thickness of the first sealant layer is 70% or less of the thickness Y, such a foreign matter is not managed in the packaging material that is the subject of the defect inspection method of the present invention. That is, in the packaging material that is the object of the defect inspection method of the present invention, in addition to the case where the foreign matter as described in FIGS. 1 to 4 is included in the first sealant layer, the foreign matter is completely absent from the first sealant layer. It may not be included.

  With the defect inspection method of the present invention, as described above, it is possible to manage the presence or absence of foreign matter that is likely to cause pinholes and heat sealability. That is, for example, by applying the defect inspection method of the present invention to a packaging material, it is possible to manage such that the position of a foreign object can be recognized by attaching a mark as in the packaging material of the present invention. It can also be used to remove foreign substances that are likely to generate pinholes or deteriorate heat sealability.

4). Use of packaging material The packaging material of the present invention is usually produced as a strip-shaped laminated film as described above, and is used as a package for sealing and storing the contents by cutting into an appropriate size. The In addition, the packaging material can be deformed according to the shape of the contents, and can be a package that accommodates the contents. Examples of the contents include various items such as medicines, cosmetics, foods, and electrolytes. That is, the packaging material of the present invention is suitably used as a pharmaceutical packaging material, a cosmetic packaging material, a food packaging material, a battery packaging material, and the like.

  Hereinafter, the present invention will be described in detail with reference to examples. However, the present invention is not limited to the examples.

[Manufacture of packaging material a]
On a base material layer 21 made of a stretched nylon film (thickness 25 μm), a metal layer 22 made of aluminum foil (thickness 40 μm) subjected to chemical conversion treatment on both surfaces was laminated by a dry lamination method. Specifically, a two-component urethane adhesive (polyol compound and aromatic isocyanate compound) was applied to one surface of the aluminum foil to form an adhesive layer A (thickness 4 μm) on the metal layer 22. Next, after bonding the adhesive layer A and the base material layer 21 on the metal layer 22 under pressure and heating, by performing an aging treatment at 40 ° C. for 24 hours, the base material layer 21 / adhesive layer A / metal layer 22 is obtained. A laminate A was prepared. In addition, the chemical conversion treatment of the aluminum foil used as the metal layer 22 is performed by rolling a treatment liquid composed of a phenol resin, a chromium fluoride compound, and phosphoric acid so that the coating amount of chromium is 10 mg / m ² (dry weight). The coating was applied to both surfaces of the aluminum foil and baked for 20 seconds under the condition that the film temperature was 180 ° C. or higher.
Next, a resin component (polypropylene resin (melting point: 150 ° C., MFR: 8 g / 10 min)) for forming the first sealant layer 11 on the metal layer 22 side of the laminate A is extruded in a molten state (250 ° C.) The first sealant layer 1 (thickness: 25 μm) was laminated to the belt, and thus a strip-shaped package comprising a laminated film in which the base layer 21 / adhesive layer A / metal layer 22 / first sealant layer 11 were laminated in order. The material a was obtained, and the laminated film had a length of 100 m, a width of 500 mm, and a thickness of 115 μm.

[Manufacture of packaging material b]
The laminated body A was manufactured like the said packaging material a. Next, a resin component for forming the first sealant layer 11 on the metal layer 22 side of the laminate A (melting point 150 degrees, MFR 8 g / 10 min) and a resin component for forming the second sealant layer (melting point 145 degrees, MFR 6 g / 10 min) The second sealant layer 12 (thickness 25 μm) and the first sealant layer 11 (thickness 25 μm) were laminated on the metal layer 22 by coextrusion in a molten state (250 ° C.). Thus, a belt-shaped packaging material b composed of a laminated film in which the base material layer 21 / adhesive layer A / metal layer 22 / second sealant layer 12 / first sealant layer 11 were laminated in order was obtained. The length of the laminated film was 100 m, the width was 500 mm, and the thickness was 140 μm.

[Manufacture of packaging material c]
The laminated body A was manufactured like the said packaging material a. Next, a resin component for forming the first sealant layer 11 on the metal layer 22 side of the laminate A (melting point 150 degrees, MFR 8 g / 10 min) and a resin component for forming the second sealant layer (melting point 145 degrees, MFR 6 g / 10 min) The first sealant layer 11 (thickness 25 μm) and the second sealant layer 12 (thickness 25 μm) were laminated on the metal layer 22 by co-extrusion in a molten state (250 ° C.). Thus, a belt-shaped packaging material c composed of a laminated film in which the base material layer 21 / adhesive layer A / metal layer 22 / first sealant layer 11 / second sealant layer 12 were laminated in order was obtained. The length of the laminated film was 100 m, the width was 500 mm, and the thickness was 140 μm.

[Defect inspection of packaging materials]
In the packaging materials a and b obtained above, the unevenness of the foreign matter was photographed with a commercially available image inspection apparatus using 50 m of each packaging material, and the size information of the unevenness was obtained. Further, the distance from the position A to the position B of the foreign matter was measured by observing a cross section of the taken foreign matter. From the relationship between the size information of the unevenness and the position of the foreign matter measured by cross-sectional observation, the threshold is image information in which the thickness X _AB of the foreign matter is 70% or less of the thickness Y of the first sealant layer, and then the remaining 30 m Image inspection was performed. As a result, there were 10 irregularities detected with the threshold set above in the packaging material a and 12 in the packaging material b. As a result of sampling each unevenness and measuring the thickness X _AB of the foreign matter, all the samples exceeded 70% of the thickness Y of the first sealant layer. Therefore, the image of the remaining 20 m of the packaging materials a and b is inspected by this method, and the sample containing the foreign matter whose foreign matter thickness X _AB exceeds 70% of the thickness Y of the first sealant layer and the sample containing 70% or less foreign matter. Were collected respectively. For the packaging material c, a 3D image was created using an OLS4100 manufactured by Shimadzu Corporation, and the thickness X _{A -B} of the foreign matter was measured. At that time, an immersion oil having the same refractive index as that of the second sealant layer 12 was used to perform defect inspection by observing the second sealant layer 12 without being affected.

[Check for pinholes]
Regarding the packaging materials a to c subjected to defect inspection by the above method, the portion where the foreign matter exists in each of the samples having a foreign matter thickness X _AB exceeding 70% of the thickness Y of the first sealant layer and 70% or less. And heat-sealing were performed under the conditions of 190 ° C., 1 MPa, and 3 seconds. As a result of cross-sectional observation of each heat-sealed sample, a sample having a foreign substance thickness X _AB of 70% or less of the thickness Y of the first sealant layer exceeds 70%, whereas an opposing sealant layer exists. In the sample, it was confirmed that the facing sealant layer in the foreign material portion was locally lost, resulting in a pinhole.

[Evaluation of adhesion of sealant layer by heat sealing]
Moreover, each sample heat-sealed on the same conditions as pinhole observation was cut out to 15 mm width, it pulled at the speed of 300 mm / min, and the heat seal intensity | strength (tensile strength) was measured. The results are shown in Table 1.

As shown in Table 1, in the sample in which the thickness X _AB of the foreign matter is 70% or less of the thickness Y of the first sealant layer, the heat seal strength is not significantly different from the sample without the foreign matter, but the thickness X _{AB of} the foreign matter However, it was found that the heat seal strength was remarkably reduced in samples exceeding 70% of the thickness Y of the first sealant layer.

DESCRIPTION OF SYMBOLS 1 ... Sealant layer 11 ... 1st sealant layer 12 ... 2nd sealant layer 2 ... Support body 21 ... Base material layer 22 ... Metal layer 5 ... Foreign material 50 ... Foreign material 51 ... Foreign material A ... Position B of the surface of the 1st sealant layer ... Position of the tip of the foreign object

Claims (11)

A packaging material comprising a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated,
Foreign matter is present inside the first sealant layer,
In the laminating direction of the laminated film, the position B of the tip of the foreign matter protrudes outward from the position A of the surface in the portion where the foreign matter does not exist in the first sealant layer,
The packaging material, wherein the thickness X _{AB of the} foreign material from the position A to the position B is 70% or less of the thickness Y of the first sealant layer in a portion where the foreign material is not present.   The packaging material according to claim 1, wherein in the sealant layer, a thickness Y of the first sealant layer in a portion where the foreign matter does not exist is 100 μm or less.   The packaging material of Claim 1 or 2 whose thickness of the said foreign material in the thickness direction of the said laminated | multilayer film is 3 micrometers or more.   The packaging material in any one of Claims 1-3 whose thickness of the said laminated | multilayer film is 300 micrometers or less.   The packaging material in any one of Claims 1-4 in which the said support body contains at least one of a base material layer and a metal layer.   The packaging material according to any one of claims 1 to 5, wherein the laminated film has a length of 100 m or more and is a wound body wound in a cylindrical shape.   The packaging material according to any one of claims 1 to 6, wherein the sealant layer further includes a second sealant layer adjacent to the first sealant layer. Inside the first sealant layer, there is a foreign matter having a thickness X _AB of the foreign matter exceeding 70% of the thickness Y of the first sealant layer in a portion where the foreign matter is not present,
The packaging material according to any one of claims 1 to 7, wherein a mark is given to the laminated film so that the position of the foreign matter can be recognized. The foreign matter having a thickness X _AB of the foreign matter exceeding 70% of the thickness Y of the first sealant layer in a portion where the foreign matter is not present is not present in the first sealant layer. The packaging material in any one of -7. A method for manufacturing a packaging material according to any one of claims 1 to 9,
After obtaining a laminated film by a laminating process including a process of laminating a support and a sealant layer having at least a first sealant layer,
Imaging the surface of the laminated film on the sealant layer side, obtaining unevenness information on the surface of the laminated film caused by the presence of the foreign matter, and
Based on the unevenness information, (1) the foreign matter is present inside the first sealant layer, and (2) the position B of the tip of the foreign matter in the lamination direction of the laminated film is the first Projecting outward from the position A on the surface of the sealant layer where the foreign matter does not exist, and (3) the thickness X _{AB of the} foreign matter from the position A to the position B is present. A step of confirming that it is 70% or less of the thickness Y of the first sealant layer of the portion that has not been done;
A method for producing a packaging material. A defect inspection method for a packaging material comprising a laminated film in which a support and a sealant layer having at least a first sealant layer are laminated,
Imaging the surface of the laminated film on the sealant layer side, obtaining unevenness information on the surface of the laminated film caused by the presence of the foreign matter, and
Based on the unevenness information, (1a) the foreign matter is present in the first sealant layer, and (2a) the position B of the tip of the foreign matter in the lamination direction of the laminated film is the first Projecting outward from the position A on the surface of the sealant layer where the foreign matter does not exist, and (3a) the thickness X _{AB of the} foreign matter from the position A to the position B is present. A step of checking whether or not it is 70% or less of the thickness Y of the first sealant layer of the portion that has not been done;
A defect inspection method for a packaging material.