JP3532594B2 - Package - Google Patents

Description

Detailed Description of the Invention

[0001]

[Industrial application] The present invention relates to a package of package packs such as milk.

[0002]

2. Description of the Related Art The invention described in Japanese Utility Model Laid-Open No. 5-13970 is known for a porosity pack of milk or the like whose contents can be easily taken out by folding a package with one hand. The above invention is a package in which a hard lid member is attached to a soft molded container, and the hard lid member has a symmetrical shape in a plan view, and fold lines are provided along an axis of symmetry.
It has a structure in which a step is formed in a direction perpendicular to the fold line. When taking out the contents, by bending the hard lid in parallel to the fold line toward the soft container, an opening is formed at the step part of the fold line so that the contents can be easily taken out from the opening. There is.

However, in the above-mentioned package, even if the hard lid member is bent parallel to the fold line toward the soft container, the lid member is only curved, and the opening is surely formed at the step portion of the fold line. However, there is a defect that the contents cannot be taken out because they are not formed.

[0004]

DISCLOSURE OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks of the conventional package, and by folding a hard lid member parallel to the fold line toward the soft container, a step portion of the fold line is formed. An object of the present invention is to provide a package in which an opening is surely formed in a certain portion and the contents can be easily taken out.

[0005]

In a package in which a rigid lid member is heat-bonded and sealed at a peripheral portion to a flexible container, the lid member is provided with a linear half from the surface side in the central portion. The cut is provided, and the step portion that is orthogonal to the half cut and reaches the peripheral portion is closer to the end side than the center of the half cut.
Provided Rino position, Rutotomoni ribs extending in a direction crossing the said half-cut is provided, the Hafuka'
The concave ribs extending in the direction orthogonal to the
The packaging body is provided so as to project downward along the lower edge .

The above-mentioned lid material is a laminate in which a biaxially stretched plastic film layer, an amorphous polyester resin layer or polystyrene resin layer having a thickness of 100 to 300 μm, and a heat adhesive resin layer are laminated by an adhesive layer. It is the above-mentioned package which consists of a body.

[0007]

By providing a plurality of ribs in the direction orthogonal to the linear half-cut provided on the rigid lid material, the lid material does not bend when the lid material is bent toward the container, and the half-cut and the step are formed. Since stress concentrates at the intersection with the upper edge of the portion, an opening is easily formed and the contents can be easily taken out.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the package of the present invention, in which (a)
Is a plan view of the package, (b) is a sectional view taken along line II in (a), FIG. 2 is a plan view showing a state in which the package of the present invention is bent toward the container to form an opening in the lid, and FIG. Sectional drawing which shows the laminated constitution of the cover material used for the package of this invention,
FIG. 4 is a view showing a conventional package, (a) is a plan view of the package, (b) is a sectional view taken along line II in (a),
1 is a package, 2 is a cover material, 3 is a container, 4 is a heat-bonded portion, 5 is a half-cut, 6 is a step, 7 is a rib, 7a is a convex rib, and 7b.
Is a concave rib, 7c is a circular rib, 8 is an opening, 11 is a surface base material layer, 12 and 14 are adhesive layers, 13 is an intermediate layer, and 15 is a thermoadhesive resin layer.

The package 1 of the present invention, as shown in FIG.
A flexible container 2 and a rigid lid member 3 manufactured by vacuum forming or the like are bonded and sealed by a heat-bonding portion 4 on a flange portion of the container to form a sealed body 1, as shown in FIG. The lid member 2 is provided with a linear half-cut 5 in the central portion of the lid member 2, a step 6 that is orthogonal to the half-cut 5 and reaches the peripheral edge, and extends at a right angle to the half-cut 5. The rib 7 has a structure in which the half cut 5 is provided at a target position. In the embodiment shown in FIG. 1, the package 1 having a triangular planar shape is shown, but the planar shape is not limited to a triangular shape, and any shape such as a circle, an ellipse, a rhombus, a quadrangle, or a rectangle may be used.

The lid member 2 of the package 1 shown in FIG. 1 is provided on the half cut 5 and the lid member 2 by pressing the edge of the lid member 2 with a finger and bending the lid member 2 toward the container 3 in parallel with the half cut member 5. In the vicinity of the intersection with the upper edge of the stepped portion 6, the lid member 2 is cut from the half-cut portion 5 to form an opening 8, and the contents in the container can be discharged to the outside and taken out. When folding the lid material 2 to the container 3 side,
By providing the ribs 7 on the lid member 2, the rigidity of the lid member 2 is increased and the bending of the lid member 2 is reduced, and the stress due to bending is applied to the half cut 5 and the step portion 6 provided on the lid member 2. The openings 8 are easily formed because they are concentrated in the vicinity of the intersection with the edge.

The lid member 2 extends from the surface of the lid member 2 to the thickness of the lid member 2 over the entire length of the lid member 2 at a position of a symmetry axis that passes through the corner portion of the lid member 2 and divides the lid member 2 into two equal parts. A half cut 5 is provided which reaches the central portion in the vertical direction or the heat-adhesive resin layer 15. A step portion 6 is provided at a position closer to a corner portion of the lid member 2 than the center of the half cut member 5 in the longitudinal direction and orthogonal to the half cut member 5 over the entire length of the lid member 2. The angle of the step 6 should be as close to the right angle as possible so that the bending of the lid 2 when the lid 2 is bent toward the container 3 is reduced and the upper portion of the half cut 5 and the step 6 Since the stress applied to the vicinity of the intersection of the edges becomes large, the opening 8 can be easily formed. The height of the stepped portion 6 depends on the size of the package 1,
2 ~ 5mm in case of general milk pork pack
It is better to set it appropriately within the range.

The rib 7 provided on the lid member 2 is intended to increase the rigidity of the lid member 2, so that the rib 7 may have any shape as long as the rigidity of the lid member 2 is increased. In the embodiment shown in FIG. 1, a concave rib 7b protruding downward along the lower edge of the step 6 is provided linearly orthogonal to the half cut 5, and the half cut 5 and the peripheral heat bonding portion 4 are provided.
A plurality of upwardly protruding convex ribs 7a extending linearly in a direction perpendicular to the half-cut 5 in a region surrounded by
However, a circular rib 7c is provided in the region between the upper edge of the step 6 and the corner of the lid member 2. In the embodiment shown in FIG. 1, the linear convex rib 7a is provided in the direction perpendicular to the half cut 5, but it may be provided obliquely with respect to the half cut 5. The circular rib 7c has a circular shape which is suitable for improving the rigidity of the lid member 2 in a narrow area. In short, the rib 7 is provided in order to increase the rigidity of the lid member 2, and may be set in an appropriate shape that can be arranged within a predetermined area.

As shown in FIG. 3, the cover member 2 is composed of a laminate of a surface layer base material layer 11, an adhesive layer 12, an intermediate layer 13, an adhesive layer 14 and a heat adhesive resin layer 15, Surface layer 11 to intermediate layer 13
The lid member is rigid as a whole and has a structure in which the half cut 5 reaching the central portion in the thickness direction or the heat-adhesive resin layer 15 is provided.

A biaxially stretched plastic film, such as biaxially stretched polyethylene terephthalate, biaxially stretched polypropylene or polycarbonate, which is excellent in heat resistance, rigidity and strength, is suitable for the film constituting the surface base material layer 11 of the lid member 2. ing. Especially, a biaxially stretched polyethylene terephthalate film having a thickness of 12 to 20 μm is most suitable. Middle tier 13
As the film, a film having excellent rigidity such as modified polyester or modified polystyrene is preferable, and a thick film having a thickness of about 100 to 300 μm is suitable for providing rigidity.

As the heat-adhesive resin layer 15, polyethylene, such as linear low-density polyethylene, medium-density polyethylene and high-density polyethylene, polypropylene, ethylene-propylene copolymer and the like, which are relatively rigid, are suitable.
As for the physical properties of the heat-adhesive resin layer 15, the tensile elastic modulus is 1500 to 3000 kg / cm ^{2 in} the longitudinal direction (MD) and ^{2 in} the transverse direction (TD).
000-4000kg / cm ² , tear strength in machine direction (MD)
A film of 10 to 30 kg / cm ² is suitable. The linear low density polyethylene having the above physical properties is most suitable. The half-cut 5 is provided in parallel with the flow direction of the heat-adhesive resin layer 15. As the heat-adhesive resin layer 15, a uniaxially stretched film having a low stretch ratio made of the above resins may be used. In that case, the half-cut 5 of the lid member 2 is provided in parallel with the stretching direction of the film.

The adhesive layers 12 and 14 are made of urethane type 2
It is preferable to use a liquid-curable adhesive, especially for increasing the adhesive strength between the intermediate layer 13 and the thermoadhesive resin layer 15, the intermediate layer
It is preferable that the adhesive surfaces of 13 and the heat-adhesive resin layer 15 are subjected to surface treatment such as corona treatment. If the adhesive strength between the intermediate layer 13 and the thermo-adhesive resin layer 15 is poor, the thermo-adhesive resin layer 15 is not completely cut along the half-cut 5 when the lid member 2 is bent toward the flexible container and the opening 8 is formed. There is a possibility that the problem that the film is not formed may occur. Immediately after corona treatment of the film surface, it is preferable to carry out lamination with a urethane adhesive.

The container 3 used in the package 1 of the present invention is composed of a laminate of thermoformable flexible plastic films, the outer surface layer of which is unstretched polypropylene film,
The intermediate layer is a resin layer having gas barrier properties such as unstretched nylon and ethylene-vinyl alcohol copolymer, and the inner surface is a heat-adhesive resin layer. When the gas barrier property is not required, the intermediate layer may be omitted to form a laminate of the unstretched polypropylene film and the thermoadhesive resin. As a specific laminated constitution, 60 micron unstretched polypropylene / 80 micron unstretched nylon / 150 micron linear low density polyethylene, 100 micron unstretched polypropylene / 20 micron ethylene-vinyl alcohol copolymer / 150 micron linear low density It is polyethylene or the like, and the total thickness is suitably 200 to 350 microns.

The method for producing the package of the present invention is carried out in the same steps as in the blister packaging provided with a flexible container. First, a laminated film for a container is thermoformed to obtain a predetermined shape. Mold into a container 3. On the other hand, for the lid member 2, a rigid cut laminated film is provided with a half-cut 5 continuous in the longitudinal direction of the laminated film from the surface base material layer 11 side, and then a mold including a male mold and a female mold is used. By molding, cover material 2
A stepped portion 6 provided orthogonally to the half-cut 5 and a concave rib 7b connected to the lower edge of the stepped portion and a convex linear rib 7a extending in a direction perpendicular to the half-cut 5. The half-cuts 5 provided on the lid member 2 are overlapped with each other so that the half-cuts 5 and the ribs 7 are located at the central position of the container 3 and the step portions 6 and the ribs 7 are located at predetermined positions in the peripheral portion of the container 3. A ring-shaped hot plate having the same shape is pressed against the flat press plate on the lid material side to seal the peripheral edge of the container by heat bonding, and then the punched package is completed to a predetermined size.

Example 1 A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and a modified polyester film having a thickness of 250 μm were laminated with a urethane adhesive, and the modified polyester film surface of the laminate was corona treated to obtain the corona. The treated surface has a tensile modulus (MD / TD) of 2700 /
In 3600kg / cm ^2, tear strength (MD) was prepared lid rigid with Ramineshiyon by urethane adhesive corona treated surface of a linear low density polyethylene film having a thickness of 30 microns is 15 kg / cm ² . A half cut reaching from the surface of the biaxially stretched polyethylene terephthalate film to the central portion in the thickness direction of the modified polyester film is provided at a predetermined position of the lid material made of the above laminated body, and then by thermoforming using a male mold and a female mold. A step portion orthogonal to the half cut provided on the lid member, a concave rib connected to the lower edge of the step portion, and a linear convex rib and a circular rib extending in a direction perpendicular to the half cut were provided. On the other hand, a laminate of a cast polypropylene film having a thickness of 60 microns, a cast nylon film having a thickness of 80 microns and a linear low density polyethylene film having a thickness of 30 microns is vacuum-formed so that the linear low density polyethylene film is on the inner surface. A flexible container having an equilateral triangle shape was produced. After filling the container with the contents, the lid material film is overlapped so that the half-cut provided on the film passes through the corners of the equilateral triangular container and comes to the center of the container, and the container side With a flat ring-shaped hot plate corresponding to the flange,
A package was produced by pressing between the flat pressure plate on the lid material side and thermally adhering at the peripheral edge of the flexible container to attach the lid material. The end of the lid material is pinched with the fingers of the package and the lid material is bent toward the container in a direction parallel to the half cut, so that the half cut is provided near the intersection of the half cut provided on the lid material and the upper edge of the step. The part was torn and an opening was generated, and the contents could be easily taken out.

[0020]

EFFECTS OF THE INVENTION A rigid lid member having a half-cut linearly provided in the central portion of a flexible container and a step provided orthogonal to the half-cut is heat-sealed at the peripheral edge portion by sealing. In the package thus provided, by providing a plurality of ribs extending in a direction perpendicular to the half cut between the half cut of the cover material and the thermal bonding portion of the peripheral edge to increase the rigidity of the cover material, By picking both ends with fingers and bending the lid material parallel to the half-cut to the flexible container side,
It is an object of the present invention to provide a package in which the stress can be concentrated near the intersection of the half-cut and the upper part of the step and an opening is easily formed, so that the contents can be easily taken out.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a package of the present invention,
(A) is a plan view of the package, (b) is II in (a)
Sectional view.

FIG. 2 is a plan view showing a state in which an opening is formed in the lid member by bending the packaging body of the present invention toward the container side.

FIG. 3 is a cross-sectional view showing a laminated structure of a lid member used in the package of the present invention.

FIG. 4 is a view showing a conventional package, in which (a) is a plan view of the package and (b) is a sectional view taken along line II in (a).

[Explanation of symbols]

1 package 2 lid material 3 containers 4 Thermal bonding part 5 half cut 6 steps 7 ribs 7a Convex rib 7b concave rib 7c circular rib 8 openings 11 Surface base material layer 12, 14 Adhesive layer 13 Middle layer 15 Thermal adhesive resin layer

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-296677 (JP, A) Actually open 5-13970 (JP, U) Actually open 63-64665 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B65D 77/30

Claims (2)

(57) [Claims] 1. A packaging body in which a rigid lid member is heat-bonded and sealed at a peripheral edge portion to a flexible container, and the lid member is provided with a linear half cut from the surface side in the central portion. In addition, the step portion that is orthogonal to the half cut and reaches the peripheral edge is
Than the center of Fukatto provided at a position of the edge side closer, Rutotomoni provided ribs extending in a direction crossing the said half-cut, it perpendicular to the half-cut
A concave rib extending in the direction projects downward along the lower edge of the step.
A packaging body characterized by being provided out . 2. A laminate in which the lid member comprises a biaxially stretched plastic film layer, an amorphous polyester resin layer or a polystyrene resin layer having a thickness of 100 to 300 μm, and a heat adhesive resin layer, which are laminated in this order. The package according to claim 1, wherein the package comprises: