TWI757555B - Packaging body and method of making the same - Google Patents

Abstract

The present invention provides a package that can be easily opened to the end.

The package 1 of the present invention includes: a container 2 having a flange 2b; and a lid 3 thermally welded to the convex It has the tongue piece 3a for unsealing on the outer peripheral part. In the container, the composite sheet 20 provided with the heat-fusible resin layer 22 and the base material layer 21 releasably laminated on one side thereof is formed into a state in which the heat-fusible resin layer is on the inside of the container. The lower surface of the lid portion is composed of a heat-fusible resin layer 32 that can be heat-sealed to the heat-fusible resin layer of the container. A cutout 23 having a depth nearly sufficient to break the heat-fusible resin layer is formed on the entire periphery of the flange upper surface on the inner side of the heat-sealing portion 4 of the lid. The interval S2 between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the cut groove is 0 to 5 mm.

Description

Packaging body and method of making the same

The present invention relates to a package body, the lid of which is formed by closely adhering to the flange of a container filled with contents such as food, medicine, electronic parts, etc., and more specifically, to a package having an easy peel function The packaging body and its manufacturing method.

For example, a package body that seals and packs food and the like as contents and has an easy-tear function includes a container having a flange on the periphery of the opening, and a lid that seals the opening of the container filled with the contents. The flange is thermally welded, and a part of the outer peripheral portion in the circumferential direction has a tongue piece for unsealing that protrudes further outward than the flange; the container is a thermally welded resin layer and a peelable laminated layer on the thermally welded The composite sheet of the base material layer on one side of the resin layer forms the heat-fusible resin layer in the form of the inner side of the container, and the lower surface of the lid is heat-sealed by the heat-fusible resin layer that can be heat-sealed to the container. The upper surface of the flange is composed of a heat-sealing resin layer, and at the inner part of the heat-sealing portion with the lid portion, a notch is formed on the entire peripheral edge. The depth is known (for example, refer to the following Patent Document 1).

According to this package, by pulling up the tongue piece for unsealing, the heat-fusible resin layer in the outer portion of the flange than the notch is peeled from the base material layer and separated from the flange together with the lid portion, whereby it is possible to easily Unpack.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 2640561

However, in the case of the above-mentioned package, when the lid for opening is pulled up to peel off the lid, the peeling resistance becomes high from the peeling position beyond the opening of the container, and it may be difficult to completely peel off the lid and the protrusion of the container may be difficult to peel off. edge separation.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a package which can be easily opened to the end.

In order to achieve the above-mentioned object, the present invention is constituted by the following aspects.

1) A package comprising: a container having a flange on the periphery of the opening; and a lid part thermally welded to the flange so as to seal the opening of the container filled with contents, and a part of the outer peripheral part in the circumferential direction It has a tongue piece for unsealing protruding to the outside of the flange; the container is a composite sheet having a heat-fusible resin layer and a base material layer releasably laminated on one side of the heat-fusible resin layer to form a thermal The fusion-bondable resin layer is the inner side of the container; the lower surface of the lid is composed of a heat-bondable resin layer that can be heat-bonded to the heat-bondable resin layer of the container; the upper surface of the flange is hotter than the lid The inner part of the welding part is formed with a notch on the entire periphery, and the notch has a depth that can almost break the heat-fusible resin layer; 5mm.

2) The package according to 1) above, wherein the base material layer of the composite sheet constituting the container comprises a metal foil layer and a matrix resin layer, and the single area layer of the matrix resin layer is layered on the metal foil layer and the other side is releasably laminated on the heat. The fusible resin layer; the cover part is composed of a composite sheet having a heat fusible resin layer and a base material layer laminated on the upper surface of the heat fusible resin layer, and the base material layer of the composite sheet includes a metal foil layer.

3) A method of manufacturing a package, which is a method of manufacturing the package according to 1) or 2) above, comprising: a step of forming a groove at a necessary place on the upper surface of the container flange; The step of superimposing on the upper surface of the flange of the container filled with the contents, and thermally welding the outer part of the overlapping parts with an interval of 1-6 mm from the outer periphery of the cut groove.

According to the package of the above 1), since the interval between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the cut groove is 0 to 6 mm, the peeling resistance does not become high even from the peeling position of the lid portion beyond the opening of the container, and the lid portion can be It peels off smoothly to the end, so it is easy to tear.

In addition, according to the package of the above 1), when the package expands around the lid portion due to the application of internal pressure, the force is dispersed from the part to be peeled off from the thermally welded portion with the cut groove as the starting point, and the force is not easily concentrated on the thermally welded portion. Therefore, it is difficult for the contents to leak out from the thermally welded part.

Here, "the distance between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the notch" refers to the radial distance between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the notch in a plan view. The above-mentioned interval is more preferably 0 to 3 mm.

According to the package of the above 2), since the metal foil layer is contained in the container and the lid, high barrier properties can be obtained, and the contents can be stored for a long period of time.

According to the manufacturing method of the package body according to the above 3), in the overlapping portion of the upper surface of the container flange and the outer peripheral portion of the lid portion, since the outer portion separated from the outer peripheral edge of the cut groove by an interval of 1 to 6 mm is thermally welded, regardless of the heat No matter what kind of resin is used in the welding part, it will not fill the cutting groove due to the melted resin, and the distance between the inner periphery of the thermal welding part and the outer periphery of the cutting groove can be 0~5mm, which can ensure the easy tearing function. the packaging body. The above-mentioned interval is more preferably 1 to 4 mm.

1: Package body

2: container

2a: Peripheral wall

2b: Flange

20: Composite sheet

21: Substrate layer

22: Thermal fusion resin layer

23: Grooving

24: Matrix resin layer

25: Metal foil layer

26: Outer resin layer

27: Adhesive layer

28: Adhesive layer

221: Heat-fusible resin layer part

3: Cover

3a: Tongue for opening

30: Composite sheet

31: substrate layer

32: Thermal fusion resin layer

33: Metal foil layer

34: Outer resin layer

35: Adhesive layer

36: Adhesive layer

4: Thermal welding part

5: Contents

6: hot plate

P: Peel position

S1: The distance between the inner peripheral edge of the hot plate (sealing position) and the outer peripheral edge of the notch during thermal welding

S2: The distance between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the notch

Fig. 1 is a perspective view showing a package according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a composite sheet serving as a container molding material for the same package.

Fig. 3 is a cross-sectional view of a composite sheet serving as a cover material of the same package.

Fig. 4 is a partially enlarged vertical sectional view showing the step of thermally welding the container flange and the lid portion in the manufacture of the same package.

Fig. 5 is a partially enlarged vertical sectional view showing the same package in an unopened state.

FIG. 6 is a partially enlarged vertical cross-sectional view showing the state of the lid portion of the same package in the initial stage of peeling.

FIG. 7 is a plan view showing the state of the lid portion of the same package at a later stage of peeling.

FIG. 8 is a partially enlarged vertical cross-sectional view taken along line VIII-VIII of FIG. 7 .

Fig. 9 is a plan view of the state of the lid portion of the same package in the final stage of peeling.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9 .

FIG. 1 shows the outline of the package of the embodiment of the present invention.

The package (1) shown in the figure is formed by sealing and packaging the contents (5) of food or medicine using a container (2) and a lid (3).

The container (2) is a cup-shaped object formed by deep drawing the composite sheet (20). More specifically, the container (2) includes a bottom wall (not shown) and a peripheral wall (2a) erected from the peripheral edge of the bottom wall. Moreover, the container (2) has a flange (2b) on the periphery of its upper opening. The flange (2b) is a flat object horizontally protruding radially outward from the upper end edge of the peripheral wall (2a). In addition, the container is not limited to the shape shown in figure.

The cover part (3) is composed of a composite sheet (30) cut into a predetermined size and shape, and the outer peripheral part of the lower surface is releasably thermally welded to the upper surface of the flange (2b) of the container (2) to seal the cover part (3). The upper opening of the container (2) filled with the content (5).

The cover part (3) is provided with a tongue piece (3a) for opening, which protrudes further outward than the flange (2b) in a part of the circumferential direction of the outer peripheral part. The tongue piece (3a) in the figure is a substantially triangular shape in plan view, and is formed to protrude radially outward from a part of the outer peripheral portion of the cover portion (3). When the cover portion (3) is unsealed, it is Pinch it with your fingers.

As shown in detail in FIG. 2, the composite sheet (20) constituting the container (2) includes a base material layer (21) and a heat-fusible resin layer (22), and the heat-fusible resin layer (22) is laminated on the base material layer (21). Among the two surfaces of 21), it becomes the surface inside the container (2).

The base material layer (21) is composed of a matrix resin layer (24), a metal foil layer (25) and an outer resin layer (26) laminated in this order from the inner side of the container (2) (the heat-fusible resin layer (22) side) constituted. The matrix resin layer (24) is, for example, an olefin-based resin such as polyethylene resin (PE) and polypropylene resin (PP), thermoplastic resin such as polystyrene resin (PS) and polyvinyl chloride resin (PVC), and polyester resin. (PEs), polyamide resin (PA), polycarbonate resin (PC) and other thermosetting resins are composed of a single layer or a multi-layer film. The metal foil layer (25) functions as a barrier layer, which improves the preservation of the content (5) For example, it can be made of aluminum (including aluminum alloy, the same below) foil, stainless steel foil, copper foil, nickel foil, and iron foil. The outer resin layer (26) can be made of, for example, polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyamide resin (PA), polyethylene naphthalate resin (PEN), polybutylene naphthalate resin (PBN), polypropylene resin (PP) composed of a single layer or a multi-layer film. It can be constituted by an adhesive layer (27) and (28) formed by a two-component curable polyester-urethane resin-based adhesive or a polyether-urethane resin-based adhesive, etc., respectively. Lamination of metal foil of metal foil layer (25) and film constituting matrix resin layer (24) and lamination of metal foil constituting metal foil layer (25) and film of outer resin layer (26). In addition, the outer resin layer ( 26 ) may be constituted by a protective film layer formed of a thermosetting cross-linkable resin such as epoxy resin, acrylic resin, etc., in place of the above-mentioned film.

The heat-fusible resin layer (22) constitutes the innermost layer of the container (2), that is, the upper surface of the bottom wall, the inner surface of the peripheral wall (2a), and the upper surface of the flange (2b), and functions to impart the flange ( 2b) The function of heat fusion (heat sealing). The heat-fusible resin layer (22) can be made of, for example, high density polyethylene resin (HDPE), low density polyethylene resin (LDPE), linear low density polyethylene resin (LLDPE), homopolypropylene resin (HPP), embedded Monolayer or multi-layer film composed of polyolefin resin such as segmented polypropylene resin (BPP) and random polypropylene resin (RPP).

For example, the heat-fusible resin layer ( 22 ) and the matrix resin layer ( 24 ) of the base material layer ( 21 ) can be laminated by co-extrusion, and can be performed between the two layers ( 22 ) and ( 24 ) when unsealing Interface peeling.

The above-mentioned composite sheet ( 20 ) as the container ( 2 ) forming material has a representative structure as follows.

That is, the following composite sheet (20) can be used: the base material layer (21) is a matrix resin layer (24) formed of a polypropylene resin film having a thickness of 80 to 1000 μm (more preferably 100 to 300 μm); Gold formed from aluminum foil with a thickness of 20~300μm (preferably 40~150μm) formed by A8079-O classified in JIS H4160 It belongs to a three-layer structure of an outer resin layer (26) formed by a foil layer (25) and a polypropylene resin film with a thickness of 20-150 μm (preferably 20-80 μm), and has a thickness of 5-200 μm (preferably 10-80 μm). 100 μm) polyolefin resin film (polypropylene resin film or polyethylene resin film) constitutes the heat-fusible resin layer (22).

The polypropylene resin film constituting the matrix resin layer (24) and the polyolefin resin film constituting the heat-fusible resin layer (22) may be laminated by co-extrusion. The polypropylene resin film constituting the matrix resin layer (24) and the aluminum foil constituting the metal foil layer (25) can pass through an adhesive layer ( 27) Laminate. The aluminum foil constituting the metal foil layer (25) and the polypropylene resin film constituting the outer resin layer (26) may also be laminated through the same adhesive layer (28) as the adhesive layer (27).

As shown in detail in FIG. 3 , the composite sheet (30) constituting the cover (3) is formed of a base material layer (31) and a heat-fusible resin layer (32) laminated on the lower surface of the base material layer (31).

The base material layer (31) has a double-layer structure and includes a metal foil layer (33) and an outer resin layer (34) laminated on the upper surface of the metal foil layer (33). The function of the metal foil layer ( 33 ) is to serve as a barrier layer for improving the preservation of the content ( 5 ), and it may be composed of, for example, aluminum foil, stainless steel foil, copper foil, nickel foil, and iron foil. The outer resin layer (34) can be made of, for example, polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyamide resin (PA), polyethylene naphthalate resin (PEN), polybutylene naphthalate resin (PBN), polypropylene resin (PP) composed of single-layer or multi-layer film (in the case of thermoplastic resin film, the melting point is higher than the thermal fusion resin layer (32) )constitute. The metal foil constituting the metal foil layer (33) and the outer resin layer (34) can be passed through the adhesive layer (36) formed by a two-liquid curing urethane-based adhesive or a polyester-based adhesive, etc. The film lamination. In addition, the outer resin layer ( 34 ) may be constituted by a protective film layer formed of a thermosetting cross-linkable resin such as epoxy resin, acrylic resin, etc., in place of the above-mentioned film.

The heat-fusible resin layer (32) constitutes the lowermost layer (innermost layer) of the cover part (3), provides the cover part (3) with heat-sealing (heat-sealing) properties, and acts as a metal foil that protects the base material layer (31) The function of the layer (33) not affected by the contents (5). The heat-fusible resin layer (32) is a general-purpose film such as a polyethylene resin (PE) film, a polypropylene resin (PP) film, or a composite film of these, which can be connected with the container (2). The heat-sealing resin layer (22) is made of a material that is strongly bonded by heat-sealing, but is preferably made of the same material as the heat-sealing resin layer (22) of the container (2). The metal foil constituting the metal foil layer (33) and the heat-fusible resin layer ( 32) of the film lamination.

The above-mentioned composite sheet ( 30 ) serving as a material of the lid portion ( 3 ) has the following typical configurations.

That is, the following composite sheet (30) can be used: the base material layer (31) is formed of an aluminum foil having a thickness of 6 to 100 μm (more preferably 9 to 30 μm) formed by A8079-O classified by JIS H4160. The metal foil layer (33) and the polyester resin film with a thickness of 9~50μm (more preferably 9~25μm) form a two-layer structure of the outer resin layer (34), and have a thickness of 5~200μm (more preferably 10~ 100 μm) of polyolefin resin film (polypropylene resin film or polyethylene resin film) constitutes the heat-fusible resin layer (32).

As shown in FIG. 4 , the upper surface of the flange (2b) of the container (2) has an annular cut groove (23) formed on the entire periphery at a necessary position on the inner peripheral side.

The depth of the notch (23) is usually such that the upper surface of the heat-fusible resin layer (22) reaches the upper surface of the base material layer (21) or its vicinity. 22) Degree of disconnection.

The notch (23) is formed by using a hot-press notch forming device with a slightly V-shaped cross-section. In addition, YAG laser, YVO ₄ The laser is formed by a laser processing machine.

In addition, the position where the notch (23) is formed may be the boundary portion between the upper surface of the flange (2b) and the inner surface of the peripheral wall (2a). In this case, after peeling off the lid portion (3), the shape of the periphery of the opening of the container (2) is uniform.

The flange (2b) of the container (2) and the lid (3) can be thermally welded, for example, by means of a hot plate, that is, as shown in FIG. ) on the upper surface of the flange (2b), the doughnut-shaped hot plate (6) heated to a predetermined temperature (about 100~220°C) is heated for a predetermined time (about 1~10 seconds) and a predetermined pressure ( 100~150kgf or so) pressed at the necessary place of the same overlapping part. The lower surface (pressing surface) of the hot plate (6) is preferably a flat surface having a width of 2 mm or more. In addition, although illustration is abbreviate|omitted, when pressing the hot plate (6), a support member is arrange|positioned on the lower surface side of the flange (2b).

During thermal welding, the hot plate (6) is arranged in the overlapping portion of the flange (2b) and the cover portion (3), and is separated from the outer peripheral edge of the groove (23) by 1~6mm (preferably 1~4mm). ) of the outer part of the interval (S1), that is, in plan view, the radial distance (S1) between the outer peripheral edge of the slot (23) and the inner peripheral edge of the hot plate (6) (sealing position) is 1~ 6mm (preferably 1 to 4mm) above the portion. The outer peripheral edge of the hot plate (6) is located in a position overlapping with the outer peripheral edge of the flange (2b) or protruding further outward than it in plan view. Therefore, in order to satisfy the above-mentioned conditions, it is necessary to appropriately set the position where the notch (23) is formed on the upper surface of the flange (2b) and the dimensions (inner diameter and outer diameter) of the hot plate (6).

Through the above-mentioned heat welding step, as shown in FIG. 5 , a heat welding part (4) is formed at a necessary place where the flange (2b) and the cover part (3) overlap. Specifically, the thermally welded portion (4) is formed in the overlapping portion The interval (S2) with the outer peripheral edge of the slot (23) is 0~5mm (preferably 0~3mm) of the outer part, that is, the outer peripheral edge of the slot (23) and the inner peripheral edge of the thermal fusion part (4) in plan view. The distance (S2) between them in the radial direction is 0 to 5 mm (more preferably, 0 to 3 mm). The outer peripheral edge of the thermally welded portion (4) is preferably tied at a position consistent with the outer peripheral edge of the flange (2b) in plan view. The width of the thermally welded portion (4) is preferably 2 mm or more.

In the above-mentioned package (1), in the unopened state, the contents (5) are sealed and packaged by the container (2) and the lid (3) (refer to FIGS. 1 and 5), so that the contents (5) can be stored without Do not degrade it. Especially in the case of the above-mentioned package (1), since both the composite sheet (20) constituting the container (2) and the composite sheet (30) constituting the lid (3) contain metal foil layers (25) (33) with excellent barrier properties ), so the contents (5) can be preserved for a long time.

Next, when taking out the contents (5) for use, pinch the opening tab (3a) of the lid (3) with your fingers and pull it up, so that it can be separated from the flange (2b) of the container (2). ), where the tongue piece (3a) adjoins, interface peeling occurs between the heat-fusible resin layer (22) and the matrix resin layer (24). If the tongue piece (3a) is pulled up in this way, when reaching the cut groove (23), the portion (221) of the heat-fusible resin layer outside the cut groove (23) will follow the cover (3) from The flange (2b) is separated, thereby performing unsealing (refer to FIG. 6).

Here, the state of peeling of the cover (3) will be described in each stage. First, in the initial stage when the peeling position does not reach the notch (23), the cover (3) is peeled from the outer peripheral edge side of the flange (2b), and then , in the intermediate stage when the peeling position reaches the notch (23), peeling is performed almost simultaneously on the side of the outer peripheral edge of the flange (2b) and the side of the notch (23) (refer to FIG. 6).

Next, as shown in FIGS. 7 and 8, when the peeling position (P) of the lid (3) exceeds the opening of the container (2) and reaches the flange (2b) on the opposite side from the tongue (3a) when unsealed ) in the part where the notch (23) leaves (near the overlap with the wiring direction of the notch (23)), because of the peeling direction, the Peel from the groove (23) side first. At this time, if the distance (S2) between the outer peripheral edge of the cut groove (23) and the inner peripheral edge of the thermally welded portion (4) exceeds 5 mm, the force required to peel off the cover portion (3) becomes too large, making it difficult to continue unsealing. . On the other hand, in the case of the above-mentioned package (1), since the interval (S2) between the outer peripheral edge of the notch (23) and the inner peripheral edge of the thermally welded portion (4) is in the range of 0 to 5 mm, no matter where the peeling occurs It does not require such a large force to peel off the cover part (3), and it can be peeled to the end to completely separate the cover part (3) from the flange (2b), that is, it can be easily and completely unsealed. In addition, if the said interval (S2) is set in the range of 0-3 mm, until the peeling of the cover part (3) is complete|finished, it does not need to pull at all, and it can open very smoothly. The separated container (2) and the lid (3) can be disposed of separately after use for easy recovery.

[Example]

Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.

[Example 1]

Both were co-extruded so that the homopolypropylene resin (HPP) was a layer (matrix resin layer) with a thickness of 250 μm and the block polypropylene resin (BPP) was a layer (heat-fusible resin layer) with a thickness of 50 μm, to make laminates.

Next, the surface on the side of the homopolypropylene resin (HPP) layer in the above-mentioned laminated sheet was bonded to an aluminum foil ( Metal foil layer) on one side, and a non-stretch polypropylene resin (CPP) film (outer resin layer) with a thickness of 30 μm was attached to the other side of the aluminum foil, and cured at 40 ° C for 5 days. This is a composite sheet for making containers.

Next, a small amount of siloxane was applied to both sides of the blank formed by cutting the above-mentioned composite sheet for containers into a predetermined shape, and then deep-drawing was performed using a male-female type mold to form a circle having a flange. Type cup container (bottom diameter 56mmφ, opening diameter 65mmφ, height 25mm, flange width 8mm).

At a position 2 mm outward (69 mmφ position) from the opening edge in the upper surface of the flange of the container to be formed, a groove forming apparatus that heats a V-shaped cutting blade in cross section to 180° C. is used to form a depth of almost 2 mm. The cut groove for the block polypropylene resin (BPP) layer of the heat-fusible resin layer to break. Use this to make a container.

On the other hand, a biaxially stretched polyethylene terephthalate resin (PET) film (outer resin layer) with a thickness of 12 μm was adhered to A1N30H-O classified by JIS H4160 using a two-liquid curable adhesive. The aluminum foil (metal foil layer) with a thickness of 20 μm is formed on one side, and a non-stretch polypropylene resin (CPP) film (thermal fusion resin layer) with a thickness of 30 μm is attached to the other side of the aluminum foil. It was hardened for 5 days, whereby the composite sheet for lids was obtained. Next, the composite sheet was cut into a square of 100×100 mm to produce a lid.

The lid portion was superimposed on the upper surface of the flange of the container in such a manner that the non-stretch polypropylene resin (CPP) film surfaces were in contact with each other. A doughnut-shaped hot plate (outer diameter 100 mmφ, inner diameter 73 mmφ) was heat-sealed (heat-sealed) by pressing for 2 seconds a portion from a position 2 mm outward from the notch in the flange to the outer peripheral edge.

Thereby, the package sample of Example 1 was obtained.

[Example 2]

The package sample of Example 2 was produced in the same manner as in Example 1 except that heat sealing was performed using a hot plate with an inner diameter of 71 mmφ so that the interval between the cut groove formed on the upper surface of the container flange and the sealing position was 1 mm.

[Example 3]

A package sample of Example 3 was produced in the same manner as in Example 1 except that heat-sealing was performed using a hot plate with an inner diameter of 77 mmφ so that the interval between the cut groove formed on the upper surface of the container flange and the sealing position was 4 mm.

[Example 4]

A package sample of Example 4 was produced in the same manner as in Example 1 except that heat sealing was performed using a hot plate with an inner diameter of 81 mmφ so that the interval between the cut groove formed on the upper surface of the container flange and the sealing position was 6 mm.

[Comparative Example 1]

A package sample of Comparative Example 1 was produced in the same manner as in Example 1 except that heat sealing was performed using a hot plate with an inner diameter of 69 mmφ so that the interval between the groove formed on the upper surface of the container flange and the sealing position was 0 mm.

[Comparative Example 2]

A package sample of Comparative Example 2 was produced in the same manner as in Example 1 except that heat sealing was performed using a hot plate with an inner diameter of 83 mmφ so that the interval between the groove formed on the upper surface of the container flange and the sealing position was 7 mm.

<Evaluation of Tearability>

For the package samples of Examples 1 to 4 and Comparative Examples 1 and 2, the flange of the container and the portion of the lid overlapping it were cut in the radial direction, and the outer peripheral edge of the cut groove on the upper surface of the flange in the cross section was measured. The distance from the inner periphery of the thermally welded portion.

Next, with respect to the package samples of Examples 1 to 4 and Comparative Examples 1 and 2, which are different from the above-mentioned measurement objects, the cover part on the outside of the flange was pinched with fingers to peel off the cover part, and it was verified whether it could be smoothly Peel it to the end.

The results of the measurement and verification are shown in Table 1 below.

As clearly shown in Table 1, in the case of the package samples of Examples 1 to 4, the peeling of the lid portion was smoothly performed and completely separated from the flange.

On the other hand, in the package sample of Comparative Example 1, the notch was blocked due to the molten resin at the time of heat sealing, and the peeling and unsealing of the lid portion could not be performed.

In the case of the package sample of Comparative Example 2, the peeling resistance of the lid portion became high until it was nearly completely opened, and it was difficult to further peel off the lid portion.

[Industrial Availability]

The present invention can be preferably used as a package body capable of sealing and packaging the contents of foods, medicines, etc. for a certain period of time and having an easy-tear function.

1: Package body

2: container

2a: Peripheral wall

2b: Flange

20: Composite sheet

21: Substrate layer

22: Thermal fusion resin layer

23: Grooving

3: Cover

3a: Tongue for opening

30: Composite sheet

31: substrate layer

32: Thermal fusion resin layer

4: Thermal welding part

5: Contents

S2: The distance between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the notch

Claims (3)

A packaging body comprising: a container having a flange on the periphery of the opening; and a lid portion thermally welded to the flange so as to seal the opening of the container filled with contents, and on a part of the peripheral portion in the circumferential direction It has a tongue piece for unsealing protruding to the outside of the flange; the container is a composite sheet having a heat-fusible resin layer and a base material layer releasably laminated on one side of the heat-fusible resin layer to form a heat-fusible resin layer. The layer is a form of the inner side of the container, wherein the heat-fusible resin layer is composed of a polyolefin resin film, and the base material layer includes a metal foil layer and a matrix resin layer, the matrix resin layer is a single-area layer on the metal foil layer and another. One side is formed by co-extrusion of thermoplastic resin or thermosetting resin laminated on a polyolefin resin film that can be interfacially peeled off; the cover part is formed by a composite sheet having a base material layer including a metal foil layer and a heat-fusible resin layer, The heat-fusible resin layer is laminated on the lower surface of the base material layer and is composed of a polyolefin resin film that can be heat-sealed to the polyolefin resin film constituting the heat-fusible resin layer of the container; the heat in the upper surface of the flange is higher than that of the cover The inner part of the welded part is formed with a notch on the entire periphery, and the groove has a depth that can almost break the heat-fusible resin layer; the width of the heat-welded part is 2 mm or more; the outer periphery of the heat-welded part, top view The lower tie is in line with the outer peripheral edge of the flange; the interval between the inner peripheral edge of the heat-welded portion and the outer peripheral edge of the cut groove is 0~3mm, so that the peeling position from the lid portion exceeds the container by pulling the opening tongue upward. From the beginning of the opening, the peeling resistance can be peeled off to the end without increasing the peeling resistance. The package according to claim 1, wherein the interval between the inner peripheral edge of the thermally welded portion and the outer peripheral edge of the cut groove is 0 mm. A method for manufacturing a package, which is a method for manufacturing the package as claimed in claim 1, comprising: a first step of forming a groove at a necessary position on the upper surface of a flange of a container; The second step of superimposing on the upper surface of the flange of the container filled with the content, and thermally welding the outer part of the overlapping parts and the outer periphery of the cut groove at an interval of 1 to 4 mm; in the second step, the A hot plate with necessary inner and outer diameters and a lower surface composed of a flat surface with a width of 2 mm or more, the position of the hot plate is that the inner periphery of the hot plate is radially spaced from the outer periphery of the groove in a plan view 1~4mm outside, and The outer peripheral edge of the hot plate overlaps with the outer peripheral edge of the flange in plan view or protrudes further outward than it, and is pressed against the overlapping portion of the flange and the cover portion from above.

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