JP2017039494A - Packaging material and packaging container using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material which enables the confirmation of the presence or absence of initial opening by adjusting tackiness of an easy-to-peel region to have a specification that makes it difficult to seal again since it has sealability after being opened that is equal to that before opening, and to provide a packaging container which uses the packaging material and is a bag body that can secure a wide opening region at a low cost.SOLUTION: A packaging material 1 is formed by sequentially laminating a first base material 2 and a second base material 3, and a thermoplastic resin layer 4 is laminated between the first base material 2 and the second base material 3. In the packaging material, at least a part of the region of the thermoplastic resin layer 4 is an easy-to-peel region comprising a heat-sealing varnish which includes an ethylene-vinyl acetate copolymer for coating by dissolving it in a solvent. A peeling strength between the layers in the easy-to-peel region is 0.2 N/15 mm or higher and 2.0 N/15 mm or lower.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging container for storing contents such as foods, cosmetics, and pharmaceuticals, and a packaging material used therefor.

  Conventionally, in a packaging container having an opening for taking out contents, a typical container having a wide opening area is a packaging container for wet tissue. The packaging container for wet tissue is composed of two members, a bag body for storing the wet tissue as the contents, and an adhesive seal that covers the opening provided in a part of the bag body. By opening and closing the adhesive seal, The opening of the bag can also be opened and closed. However, this conventional packaging container is expensive because it uses two members, and the size of the opening must be smaller than the adhesive seal, so the contents to be stored However, it was limited according to the size of the opening, and could not be said to be a highly versatile packaging container.

  In contrast, attempts have been made to make a single member by using a multilayer film in which an adhesive resin layer is laminated as an intermediate layer (Patent Document 1). The multilayer film shown in Patent Document 1 includes a surface resin layer mainly composed of an ethylene- (meth) acrylic acid copolymer and / or a metal neutralized product thereof (ionomer resin), a styrene block, and a diene block. An adhesive resin layer containing a hydrogenated block of a rubbery block copolymer and a tackifier, and a heat seal resin layer containing an olefin resin, a polyester resin or a styrene resin as main components Are multilayer sealant films laminated in this order by coextrusion lamination.

  When the multilayer sealant film shown in Patent Document 1 is obtained by co-extrusion in the stacking order in which the adhesive resin layer is sandwiched between the surface resin layer and the heat seal resin layer, the material used and the thickness of each resin layer are obtained. By devising the thickness, the present invention intends to provide a resealable multilayer sealant film excellent in low odor, suitability for continuous film formation, and adhesiveness of an opening seal part. The packaging material laminated with this sealant is opened by the cohesive failure of the heat seal resin layer and the adhesive resin layer or the adhesive resin layer when the seal part is opened, and the resealability is exhibited by the exposed adhesive resin layer. It is.

  However, it is necessary to make the adhesive resin layer thinner in order to control the adhesive force, particularly in reducing the reseal strength, but because there is a limit to the layer thickness control during film formation, it exhibits stable low peel properties. Obtaining a film is very difficult. Moreover, since special resin is used, it leads to a cost increase and its versatility is low.

  Therefore, an aqueous dispersion type can be used between layers of the first base material and the second base material to enable production of a packaging material capable of arbitrarily setting a portion exhibiting adhesiveness and adjusting the peel strength at low cost. A technique is disclosed in which a resin layer made of a delayed tack agent is laminated and the adhesiveness is expressed by heat during extrusion (Patent Document 2).

  However, since the packaging material disclosed in Patent Document 2 is configured to exhibit adhesiveness by heat during processing, it is necessary to apply a large amount of heat in order to exert sufficient adhesiveness. It was not good.

Moreover, in the packaging container using the packaging material shown in Patent Document 2, since the adhesiveness is expressed, it can be repeatedly opened and closed, and after opening at a store or the like and mixing foreign matter inside the packaging container,
It becomes possible to seal again so as not to know that it has been opened.
In recent years, since there is an increasing consumer need to eliminate such anxiety about contamination, a packaging container that can confirm whether or not the container has been opened for the first time is desired.

Japanese Patent No. 4232081 JP 2011-184083 A

  The present invention was made in view of the circumstances as described above, and after adjusting the adhesiveness of the easily peelable region and opening it once, by re-sealing with the same sealing properties as before opening, Providing at low cost a packaging material capable of confirming the presence or absence of the first opening and a packaging container using the packaging material and capable of securing a wide opening area while being a bag. Is an issue.

  This invention is made | formed in view of the subject which concerns, The packaging material of this invention is a packaging material formed by laminating | stacking a 1st base material and a 2nd base material sequentially, Comprising: This 1st base material and A thermoplastic resin layer is laminated between the second base materials, and at least a part of the thermoplastic resin layer contains an ethylene-vinyl acetate copolymer and is dissolved in a solvent and coated. It is an easily peelable region made of a seal varnish, and the peel strength between layers in the easily peelable region is 0.2 N / 15 mm or more and 2.0 N / 15 mm or less.

  In the packaging material of the present invention, the thermoplastic resin layer may be formed with the easily peelable region and the strong adhesion region, and the strong adhesion region may be disposed adjacent to the easy peel region. The thermoplastic resin layer in the strong adhesion region may contain acid-modified polyethylene.

  Further, a part of the region adjacent to the easily peelable region may include a thermoplastic resin layer uncoated region in which the second base material is directly laminated on the first base material.

  In order to solve the above problems, the packaging container of the present invention is a packaging container using a packaging material obtained by sequentially laminating a first base material and a second base material, and the first base material and A thermoplastic resin layer is laminated between the second base materials, and at least a part of the thermoplastic resin layer contains an ethylene-vinyl acetate copolymer and is dissolved in a solvent and coated. It is an easily peelable region made of a seal varnish, and the peel strength between layers in the easily peelable region is 0.2 N / 15 mm or more and 2.0 N / 15 mm or less.

  Moreover, the packaging container of this invention exists in the opening area of the 1st opening part and this 1st opening part which were divided by the cut line which penetrates the said 1st base material, and penetrates the said 2nd base material A second opening section defined by a piercing line is formed, and a region of the thermoplastic resin layer sandwiched between the first opening section and the second opening section is the easy opening section. It may be a peeling region.

  Further, in the packaging container of the present invention, in the thermoplastic resin layer, an opening area of the second opening may be a strong adhesion area, or the first opening of the thermoplastic resin layer. The region outside the opening may be a strong adhesion region. Note that the thermoplastic resin layer in the strong adhesion region may contain acid-modified polyethylene.

  Moreover, the peeling start part which starts peeling of the said 1st opening part may be a thermoplastic resin layer uncoated area | region where the said 2nd base material is directly laminated | stacked on the said 1st base material.

The packaging material of the present invention contains an ethylene-vinyl acetate copolymer (EVA), and an easily peelable region formed of a heat seal varnish that is dissolved and coated in a solvent is formed between the first substrate and the second substrate. Therefore, the processability is good, and the first substrate can be easily peeled from the second substrate. In addition, the first substrate and the second substrate in the easily peelable region measured by the method shown in JIS-K6854 “Adhesive—Peeling peel strength test method—Part 3: T-shaped peel” When the peel strength between the layers is 0.2 N / 15 mm or more and 2.0 N / 15 mm or less, it is possible to prevent the base material from being cut or damaged due to excessive strength, and it is intended before opening due to insufficient strength. It is also possible to prevent natural peeling or local floating.
In addition, since strong adhesiveness does not appear on the release surface of the easy-release region, it is possible to confirm the presence or absence of initial opening, and a packaging material excellent in safety and hygiene can be obtained.
Furthermore, since an adhesive seal member as described in the prior art is not required, it is possible to provide a packaging material that is low in cost and whose opening region is not limited.

Further, the thermoplastic resin layer is formed with the easily peelable region and the strong adhesive region, and the strong adhesive region is disposed adjacent to the easy peelable region, so that it peels off at the easy peelable region. Since the peel strength between the layers is different between the portion to be bonded and the strong adhesion region, only an arbitrary region can be easily peeled without peeling to an unintended portion.
In this case, it is more preferable to make a cutting line near the boundary between the easy peeling region and the strong adhesion region, for example, with a blade or a carbon dioxide laser.

  In addition, by using acid-modified polyethylene for the thermoplastic resin layer in the strong adhesion region, the difference in peel strength from the easy peel region using EVA becomes clear, so that only an arbitrary region can be peeled more easily. Is possible.

  In addition, in a part of the region adjacent to the easy-peeling region, there is a thermoplastic resin layer uncoated region in which the second base material is directly laminated on the first base material. In the resin layer uncoated area, since there is no heat sealant between the first base material and the second base material, the adjacent easy peeling area using the thermoplastic resin layer uncoated area as a trigger for peeling. It is possible to smoothly start the peeling.

The packaging container of the present invention includes an ethylene-vinyl acetate copolymer (EVA), and an easily peelable region formed of a heat seal varnish that is dissolved and coated in a solvent is formed between the first substrate and the second substrate. Therefore, the processability is good, and the first substrate can be easily peeled from the second substrate. In addition, the first substrate and the second substrate in the easily peelable region measured by the method shown in JIS-K6854 “Adhesive—Peeling peel strength test method—Part 3: T-shaped peel” When the peel strength between the layers is 0.2 N / 15 mm or more and 2.0 N / 15 mm or less, it is possible to prevent the base material from being cut or damaged due to excessive strength, and it is intended before opening due to insufficient strength. It is also possible to prevent natural peeling or local floating.
In addition, since strong adhesiveness does not appear on the peeling surface of the easy peeling region, it is possible to confirm the presence / absence of initial opening, and it is possible to obtain a packaging container excellent in safety and hygiene.
Furthermore, since an adhesive seal member as described in the prior art is not required, it is possible to provide a packaging container that is low in cost and whose opening region is not limited.

  A first opening section defined by a score line penetrating the first base material; and an aperture region of the first opening section defined by a score line penetrating the second base material. By having the second opening, it is possible to easily open the second opening serving as an outlet for taking out the contents at the same time as the first opening is peeled off.

Further, by making the region sandwiched between the first opening and the second opening in the thermoplastic resin layer the easy-peeling region, the first opening can be peeled smoothly. Thus, since the adhesive surface does not exhibit strong adhesiveness after being once peeled off, it is possible to confirm the presence or absence of the first opening.
When the inside of the opening area of the second opening is a strong adhesion area, the second base material is reliably lifted together with the first base material within the opening area of the second opening serving as an outlet for taking out the contents. It becomes possible to open.
Furthermore, by making the outside of the opening area of the first opening a strong adhesion area, the peeling strength differs on both sides of the boundary line of the opening area of the first opening. Can be performed more smoothly.

  In addition, by using acid-modified polyethylene for the thermoplastic resin layer in the strong adhesion region, the difference in peel strength from the easy peel region using EVA becomes clear, so that only an arbitrary region can be peeled more easily. In addition, the second opening can be easily opened.

  In addition, the thermoplastic resin layer uncoated region in which the second base material is directly laminated on the first base material is formed on the portion where the first opening starts to be peeled off. In the uncoated area, since there is no heat sealant between the first base material and the second base material, the adjacent easy-peeled area is peeled off by using the uncoated area of the thermoplastic resin layer as a trigger. Can be started smoothly.

It is explanatory drawing which showed typically embodiment of the packaging material of this invention. It is explanatory drawing which showed typically embodiment of the packaging container of this invention. FIG. 3 is a cross-sectional explanatory view schematically showing the AA cross section of FIG. 2.

  Embodiments for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the packaging material 1 of the present invention is formed by laminating a first base material 2 and a second base material 3, and between the first base material 2 and the second base material 3, A plastic resin layer 4 is laminated.

  The first substrate 2 may be a single layer or multilayer film used as a surface substrate in a normal soft packaging bag. For example, low density polyethylene resin (LDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (LLDPE), polypropylene resin (PP), polyolefin resin such as polyolefin elastomer, polyethylene terephthalate resin (PET), polyester resins such as polybutylene terephthalate resin (PBT), polyethylene naphthalate resin (PEN), cellulose resins such as cellophane and cellulose triacetate (TAC), polymethyl methacrylate (PMMA) resin, ethylene- Vinyl acetate copolymer resin (EVA), ionomer resin, polybutene resin, polyacrylonitrile resin, polyamide resin, polystyrene resin (PS), polyvinyl chloride resin (PVC), polyvinylidene chloride Resin (PVDC), polycarbonate resin (PC), fluorine-based resin, synthetic resin film such as a urethane-based resin, a metal foil or the like alone or be used in combination. In addition, the 1st base material 2 contains a gas barrier property provision layer, a printing layer, and an adhesive bond layer as needed.

  Examples of the gas barrier property-imparting layer include: a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier film such as a gas barrier PET film, an aluminum for a PET film, etc. Contains metal-deposited films such as metal-deposited films, inorganic-oxide-deposited films obtained by depositing inorganic oxides such as aluminum oxide and silicon oxide on PET films, polyvinylidene chloride coating, water-soluble resins and inorganic layered compounds A gas barrier coating layer such as a resin layer made of a film obtained by reacting an isocyanate compound with a coating film, a metal alkoxide or a hydrolyzate thereof, or a metal foil such as an aluminum foil is used.

Since the second base material 3 becomes the inner surface side when the packaging container 10 of the present invention is made, it is necessary to have a sealant layer on the surface opposite to the first base material 2 which is the innermost layer. There is.
As the sealant layer, polyolefin resin is generally used. Specifically, LDPE, medium density polyethylene resin (MDPE), LLDPE, EVA, ethylene resin such as ethylene / α-olefin copolymer, and unstretched Polypropylene resins such as polypropylene resin (CPP), heat-seal type biaxially oriented polypropylene (OPP) homopolypropylene resin, propylene / ethylene random copolymer, propylene / ethylene block copolymer, propylene / α-olefin copolymer, etc. Is used. In addition, a multilayer film in which these resins are combined may be used.
In addition, the 2nd base material 3 is good also as only a sealant layer, and is good also as a multilayer containing a gas barrier property provision layer and a printing layer as needed.

  The thermoplastic resin layer 4 is generally made of a polyolefin-based resin, specifically, ethylene such as LDPE, MDPE, LLDPE, EVA, ethylene / α-olefin copolymer, ethylene-methacrylic acid resin copolymer. Polypropylene resins such as polyethylene resins, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers, and propylene / α-olefin copolymers are used. In addition, these modified resins and composites of these resins may be used.

  As shown in FIGS. 2 and 3, the thermoplastic resin layer 4 may be provided with easy peeling regions 41 and strong bonding regions 42.

  As the thermoplastic resin layer 4 in the easy peeling region 41, in order to have good workability and weaken the adhesiveness on the peeling surface, a material composed of heat seal varnish containing EVA and dissolved in a solvent and coated is preferably used. The In addition to the EVA, other resins used as the thermoplastic resin layer 4 and other functional resins can be added to the coating agent dissolved in the solvent in this case. The content ratio of the product is preferably less than the EVA content ratio.

  In the thermoplastic resin layer 4 in the easy peeling region 41, it is not preferable to use a liquid-solid aqueous coating liquid such as a dispersion in which a hot melt agent or fine particles are dispersed in water. This is because, when a hot melt agent is used, when the thermoplastic resin layer 4 is printed, it becomes difficult to perform part coating because of high viscosity. When an aqueous coating liquid such as a dispersion is used. Compared with the case of using a heat seal varnish, the processing speed is greatly reduced and the adhesiveness on the peeled surface is strong, making it difficult to confirm the presence or absence of the first opening.

  As the thermoplastic resin layer 4 in the strong adhesion region 42, acid-modified polyethylene synthesized by an addition reaction of maleic anhydride or the like with polyethylene is preferably used. In this case, in addition to the acid-modified polyethylene, other resins used as the thermoplastic resin layer 4 and other functional resins can be added, but the content ratio of the additive is EVA. It is preferable to make it less than the content ratio.

Note that a thermoplastic resin layer uncoated region 43 in which the second base material 3 is directly laminated on the first base material 2 may be provided in a part of the region adjacent to the easy peeling region 41. .
This is because the thermoplastic resin layer 4 does not have the thermoplastic resin layer 4 in the thermoplastic resin uncoated region 43 and the first base material 2 is likely to float from the second base material 3. Using the uncoated area 43 as a trigger for peeling, it becomes possible to smoothly start peeling of the adjacent easy peeling areas 41.

The packaging material 1 is manufactured by pasting the surface of the first base material 2 with the thermoplastic resin layer 4 part-coated by an in-line printing process and the second base material 3 by thermal lamination.
In addition, in order to perform peeling in the easy peeling area | region 41 more easily, when putting a score line with a blade or a carbon dioxide laser etc. on the front and back of the packaging material 1, the 1st base material 2 and the 2nd base material 3 Cutting is performed after bonding together.

As shown in FIG. 2, the packaging container 10 using the packaging material 1 may be configured by folding a single packaging material 1 by providing a folding portion, or by configuring two separate films. Also good. When it is set as two separate films, the film of the side which provides an opening part should just be the packaging material 1 of this invention.
Moreover, it is good also as a gusset bag by inserting the side tape folded in half into the side surface of the packaging container 10 with a fold part inward, and sealing.

  As shown in FIG. 3, the packaging container 10 is in a first opening 61 defined by a cut line 5 penetrating the first base material 2, and in an opening region of the first opening 61. It has the 2nd opening part 62 divided by the cut line 5 which penetrates the base material 3. FIG. When the first base material 2 in the opening area of the first opening 61 is peeled from the second base material 3 in the direction of the peeling direction P, the second base material 3 is in the opening area of the second opening 62. By being lifted together with the first base material 2 while being laminated on the base material 2, an outlet for taking out the contents opens. Further, when peeling to the end of the second opening 62, the second base 3 is peeled from the first base 2 because there is a cut line 5 penetrating the second base 3.

  At this time, by making the region sandwiched between the first opening 61 and the second opening 62 as the easy peeling region 41, the first opening 61 can be smoothly peeled, and after the peeling once Since the peeled surface does not exhibit strong adhesiveness, it is possible to confirm the presence or absence of the first opening.

Moreover, when the inside of the opening area of the second opening 62 is the strong adhesion area 42, the second base 3 is securely attached to the first base 2 within the opening area of the second opening 62 serving as an outlet for taking out the contents. Can be lifted and opened together.
Further, by making the outside of the opening area of the first opening 61 the strong adhesion area 42, the peel strength differs on both sides of the boundary line of the opening area of the first opening 61. Peeling can be performed more smoothly.

In addition, in order to perform peeling in the easy peeling area | region 41 more easily, when putting the cutting line 5 in the predetermined position of the 1st base material 2 and the 2nd base material 3 with a blade or a carbon dioxide gas laser, etc., a cutting line 2 and 3 are preferably provided slightly inside the easily peelable region 41 as shown in FIGS.
This is a buffer for absorbing the shift of the processing position in consideration of performing the cutting process after bonding the first base material 2 and the second base material 3, and when entering too much inside, Since the boundary position where the cutting line 5 and the peeling strength are different is separated, it becomes difficult to perform smooth peeling. For this reason, it is preferable to set the score line 5 at a position entering, for example, about 1 mm from the periphery of the easy peeling region 41.

As shown in FIGS. 2 and 3, the peeling start portion 60 for starting the peeling of the first opening 61 is a thermoplastic resin layer uncoated in which the second base material 3 is directly laminated on the first base material 2. The region 43 is preferable.
This is because the thermoplastic resin layer 4 does not have the thermoplastic resin layer 4 in the thermoplastic resin uncoated region 43 and the first base material 2 is likely to float from the second base material 3. Using the uncoated area 43 as a trigger for peeling, it becomes possible to smoothly start peeling of the adjacent easy peeling areas 41.

  Up to this point, the case where the inside of the opening area of the second opening 62 is the strong adhesion area 42 has been described as an example. However, the inside of the opening area of the second opening 62 and the outside of the opening area of the first opening 61 are described. In addition, the entire thermoplastic resin layer 4 can be used as the easy peeling region 41. In this case, the first opening 61 is peeled and the second opening 62 is opened at an arbitrary position using the cut line 5.

The packaging container 10 can be made by a known bag making method, but it is preferable to make a bag while replacing the inside of the packaging container 10 with nitrogen by a reverse pillow (top seam) type horizontal pillow bag making machine.
The horizontal pillow bag making machine wraps the contents with a packaging material and seals both side ends (center seal) to form a cylinder, and then seals the upper and lower ends by sealing (end seal). The packaging material is supplied from above, and in the reverse pillow type, the packaging material is the conveyor for the normal pillow (bottom seam) type where the center seal is placed under the conveyor so as to wrap the conveyor carrying the contents such as food from above. The center seal is performed above the contents. There is also a reverse pillow type that packs the contents directly on the packaging material instead of placing the contents on the conveyor. In this case, the contents can be wrapped without touching anything other than the packaging material. It is excellent in terms of hygiene, and even sticky contents can be easily packaged.
In addition, when making the packaging container 10 into the form of a four-sided seal bag or a gusset bag, the bag making method is not limited to this.

  Next, examples of the present invention will be described.

<Example 1>
For the first base material 2, OPP on which a gas barrier property-imparting layer was laminated was used, and for the second base material 3, CPP was used. The thickness of each layer was 20 μm for the gas barrier property imparting layer, 20 μm for OPP, and 40 μm for CPP. Here, as the gas barrier property-imparting layer, a ternary coating layer of polyvinyl alcohol (PVA), polyurethane, and an inorganic layered compound was used. On the surface of the first substrate 2 opposite to the gas barrier property-imparting layer, ink for printing a pattern, characters, or the like is subjected to part coating in the printing in-line simultaneously with the thermoplastic resin layer 4, and then the first substrate 2 and the second base material 3 are bonded together by thermal lamination at 120 ° C., and the packaging material 1 is produced. A packaging container 10 was obtained by filling and filling six chicken nuggets with nitrogen in a type of horizontal pillow bag making machine.

The entire thermoplastic resin layer 4 was used as an easily peelable region 41, and 3 g / m ^{2 of} EVA (M-750, manufactured by DIC Corporation) was applied to the easily peelable region 41 as a heat seal varnish that was dissolved in a solvent and coated.

  With respect to the obtained packaging container 10, the first substrate 2 in the easily peelable region 41 and the JIS-K6854 “adhesive—peeling peel strength test method—part 3: T-shaped peel” The peel strength between the layers of the second substrate 3 was measured. In addition, a sensory test is performed to determine whether the part coating process in the printing in-line has been performed well or whether the opening has been performed as indicated by the score line 5, and the peeled surface after being peeled once is observed. It was confirmed whether it was expressed or whether or not the first opening was confirmed. The peel strength measurement result is “peel strength”, the part coat sensory test result is “processability”, the sensory test result is “openability”, and the peel surface condition observation result is “peel” The results are shown in Table 1 as “surface adhesiveness”.

  In Table 1, the processing suitability indicates that the case where the part coating process in the printing in-line can be performed satisfactorily, the case where the part coating process can be performed but the processing speed is slow, and the process aptitude are not satisfactory. The case was X. In addition, the openability was evaluated as “◯” when it could be opened according to the score line 5 and “X” when it could not be opened. In addition, the peelable surface adhesiveness can be re-sealed to such an extent that strong adhesiveness does not appear and the presence or absence of initial opening can be confirmed. The case was taken as x.

<Example 2>
OPP was used for the first substrate, heat-seal type OPP was used for the second substrate, and the thickness of each layer was 30 μm for OPP and 35 μm for heat-seal type OPP. As shown in FIG. 2, the region sandwiched between the first opening 61 and the second opening 62 is strongly peeled area 41, the inside of the opening area of the second opening 62 and the outside of the opening area of the first opening 61 are strong. The adhesive region 42 was coated with 3 g / m ^{2 of} EVA (M-750, manufactured by DIC Corporation), and 1.5 g / m ^{2 of} acid-modified polyethylene was applied to the strong adhesive region 42. Other than that, it processed and bag-formed similarly to Example 1. Table 1 shows the results of peel strength, processability, openability, and peel surface adhesiveness of the resulting packaging container 10.

<Example 3>
OPP is used for the first substrate, and CPP (VM-CPP) on which an inorganic oxide is deposited is used for the second substrate. The thickness of each layer is 30 μm for OPP and 40 μm for VM-CPP. It was. Other than that, it processed and bag-formed similarly to Example 1. Table 1 shows the results of peel strength, processability, openability, and peel surface adhesiveness of the resulting packaging container 10.

  Next, a comparative example of the present invention will be described.

<Comparative Example 1>
Processing and bag making were performed in the same manner as in Example 1 except that 1.5 g / m ² of acid-modified polyethylene (SE-5203N manufactured by Unitika Ltd.) was applied to the easy peeling region 41. Table 1 shows the results of peel strength, processability, openability, and peel surface adhesiveness of the obtained packaging container.

<Comparative Example 2>
A liquid-solid aqueous type EVA (ED-900N manufactured by DIC Corporation) such as a dispersion in which particles are dispersed in water was applied to the thermoplastic resin layer 4 in the easy peeling region 41 and applied at 8 g / m ² . Except for the above, processing and bag making were carried out in the same manner as in Example 1. Table 1 shows the results of peel strength, processability, openability, and peel surface adhesiveness of the obtained packaging container.

<Comparative Example 2>
The thermoplastic resin layer 4 in the easily peelable region 41 is processed and bag-formed in the same manner as in Example 1, except that EVA (H-232 manufactured by Toyo Adre Co., Ltd.) as a hot melt agent is used and 15 g / m ^{2 is} applied. did. Table 1 shows the results of peel strength, processability, openability, and peel surface adhesiveness of the obtained packaging container.

<Comparison result>
When Table 1 is seen, in Examples 1-3, all processability, openability, and peeling surface adhesiveness are all (circle), whereas in Comparative Example 1, openability is x, Comparative Example 2. Then, the processability is Δ, the peeling surface adhesiveness is x, and the processability is x in Comparative Example 3, and it can be seen that the effects required for the packaging container 10 are not sufficiently obtained.
In Comparative Example 1, the peeled surface could not be observed because the substrate was cut and could not be opened.

  In Comparative Example 1, the peel strength between the first base material 2 and the second base material 3 is 3 N / 15 mm due to the use of acid-modified polyethylene with high adhesive strength in the easy peel region 41. When the film was forcibly separated, the first substrate 2 and the second substrate 3 around the score line 5 were broken.

  In Comparative Example 2, since the water-based coating liquid was used for the easy peeling region 41, the processing speed was greatly reduced as compared with the case of using a heat seal varnish, and the adhesiveness on the peeling surface was strong, and whether or not the first opening was performed It became difficult to confirm.

  In Comparative Example 3, since a hot melt agent was used for the easy peeling region 41, when the thermoplastic resin layer 4 was printed, it was difficult to part coat with high viscosity.

  According to the present invention, the adhesiveness of the easy-peeling region 41 is adjusted, and once opened, it is possible to confirm the presence or absence of initial opening by making it difficult to re-seal with the same sealing properties as before opening. It is possible to provide an inexpensive packaging material and a packaging container using the packaging material, which can secure a wide opening area while being a bag body at low cost.

DESCRIPTION OF SYMBOLS 1 ... Packaging material 2 ... 1st base material 3 ... 2nd base material 4 ... Thermoplastic resin layer 5 ... Cut line 10 ... Packaging container 41 ... Easy peeling area 42 ... Strong adhesion region 43 ... Thermoplastic resin layer uncoated region 60 ... Peeling start part 61 ... First opening 62 ... Second opening P ... Peeling direction

Claims (11)

A packaging material obtained by sequentially laminating a first base material and a second base material,
A thermoplastic resin layer is laminated between the first base material and the second base material,
At least a partial region of the thermoplastic resin layer is an easily peelable region comprising a heat seal varnish containing an ethylene-vinyl acetate copolymer and dissolved in a solvent and coated.
A packaging material, wherein an interlayer peel strength in the easy peel region is 0.2 N / 15 mm or more and 2.0 N / 15 mm or less. The packaging material according to claim 1,
In the thermoplastic resin layer, the easily peelable region and the strong adhesion region are formed,
The packaging material, wherein the strong adhesion region is disposed adjacent to the easy peeling region. The packaging material according to claim 2,
The packaging material, wherein the thermoplastic resin layer in the strong adhesion region contains acid-modified polyethylene. The packaging material according to any one of claims 1 to 3,
In a part of the area adjacent to the easy peeling area,
A packaging material comprising a thermoplastic resin layer uncoated region in which the second substrate is directly laminated on the first substrate. A packaging container using a packaging material formed by sequentially laminating a first base material and a second base material,
A thermoplastic resin layer is laminated between the first base material and the second base material,
At least a partial region of the thermoplastic resin layer is an easily peelable region comprising a heat seal varnish containing an ethylene-vinyl acetate copolymer and dissolved in a solvent and coated.
A packaging container having a peel strength between layers in the easy peel region of 0.2 N / 15 mm or more and 2.0 N / 15 mm or less. The packaging container according to claim 5,
A first opening defined by a score line penetrating the first substrate;
A packaging container comprising: a second opening that is in an opening region of the first opening and is partitioned by a score line that penetrates the second base material. The packaging container according to claim 6,
The packaging container characterized in that an area between the first opening and the second opening in the thermoplastic resin layer is the easy peeling area. A packaging container according to claim 6 or 7,
In the thermoplastic resin layer, the inside of the opening area of the second opening is a strong adhesion area. It is a packaging container given in any 1 paragraph of Claims 6-8,
Out of the thermoplastic resin layer, the outside of the opening area of the first opening is a strong adhesion area. A packaging container according to claim 8 or 9, wherein
The packaging container, wherein the thermoplastic resin layer in the strong adhesion region contains acid-modified polyethylene. It is a packaging container given in any 1 paragraph of Claims 6-9,
The peeling start part for starting peeling of the first opening is
The packaging container, wherein the second base material is an uncoated region of the thermoplastic resin layer directly laminated on the first base material.

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