JPH0219280A - Container - Google Patents

Abstract

PURPOSE:To contrive the improvement of the opening easiness of a container and the operational efficiency by making the adhesive strength between an inner and outer layer smaller than that between a flange and a lid material and forming an inner and outer weak line inwardly and outwardly of the flange and unsealed zone in the inner layer of the lid material at the location including the part corresponding to a part of an outer weak line. CONSTITUTION:The separation strength between an inner layer 11 and an outer layer 12 is made smaller at least than the sealing strength between a flange 13 and a lid material 15. A notch 18 is formed as an inner weak line in the inner layer 11 of the flange 13 inwardly of an inner sealing edge 16A and a tear line 19 is formed therein as an outer weak line outwardly of an outer sealing edge 16B. Although it is desirable that the depths of the notch 18 and the tear line 19 reach the boundary surface between the inner layer 11 and the outer layer 12, they may not be a specified depth, so long as they are separable from the tear line 19 to the notch 18 to open a container upon removing the lid material 15. A hole 20 is formed in a corner of the flange 13 as an unsealed zone, including the part corresponding to a part of the tear line 19 and the innermost edge of the container becomes the outer sealing edge 16B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a container body having a multilayer structure having a flange portion and a container having a lid material melt-sealed to the container body.

[Conventional technology]

BACKGROUND ART Conventionally, containers have been widely used for packaging foods, which include a container body having a flange portion and a lid material, and the flange portion and the lid material are melt-sealed.

In order to achieve both easy-opening and sealing properties, this container has a multi-layered container body with a lower adhesive force between the eyebrows than the flange and the lid, and the inside of this sealing area is Some containers have a non-sealed part and a cutout as a line of weakness in the non-sealed part, so that when the container is opened, the container body is peeled off from the outer edge to the notch.

In addition, this container has ribs to improve rigidity.
Some containers have bent parts such as skirts and curls formed on the flange part.In order to improve ease of opening, in this type of container, a cutting line is formed as a line of weakness at the outer edge of the seal part, and the container can be opened from this cutting line. The body is starting to peel off between the eyebrows.

However, if a cut line is formed in advance on the flange, it is difficult to position the cut line accurately and melt-seal, and even if the outer edge of the seal deviates even slightly to the inside or outside of the cut line, the container cannot be opened. becomes difficult.

Therefore, as a container that solves this problem, a container has been proposed in which the ribs of the unsealed part are cut so that the cant surface of the outer end of the flange part and the outer edge of the seal are aligned (Japanese Patent Laid-Open No. 63-96060).

[Problem that the invention seeks to solve]

However, in the conventional example mentioned above, ■The ribs on the flange part are cut, which not only reduces the rigidity and strength of the cut part, but also causes edge breakage on both sides of the cut part when opening the package, causing peeling on the opening surface. A layer remains and the appearance of the container becomes poor.Furthermore, it is not always easy to seal because the outer edge of the seal is aligned with the cut surface of the outer edge of the flange, and furthermore, the seal width cannot be set arbitrarily. There is a problem.

Here, the object of the present invention is to easily open the package, and to
An object of the present invention is to provide a container and a container body that can improve workability.

Means for Solving Problem C] The first invention of the present application (the invention as set forth in claim 1) comprises a container body having a flange portion, an inner layer portion facing the inside of the main body, and an outer layer peelably polymerized to the inner layer portion. the container, the container having a lid material melt-sealed to the flange portion, the adhesive force between the inner layer portion and the outer layer portion being smaller than the adhesive force between the flange portion and the lid material; An inner line of weakness and an outer line of weakness are formed inside and outside the part, and a non-sealing area where the lid material is not melt-sealed to the inner layer part is formed at a position that includes a portion corresponding to a part of the outer line of weakness.

Moreover, the second invention of the present application (the invention stated in claim 2) is:
In the first invention, the flange portion of the container body includes a rib;
It is formed with bent parts such as skirt parts and curls.

Furthermore, a third invention of the present application (invention according to claim 3) is a container body in which a lid material is melt-sealed at a flange portion, and the lid material is formed in an inner layer portion facing the inside of the main body and peelably polymerized thereon. The adhesive force between the inner layer part and the outer layer part is smaller than the adhesive force between the flange part and the lid material, and an inner weakening line is formed inside the flange part, and a cutting line is formed outside the flange part. A hole for preventing the lid material from being melt-sealed to the inner layer part is formed at a position of the flange part including a part corresponding to a part of the cutting line.

[Effect]

In the first and second inventions configured in this way, the container body and the lid material are melt-sealed by an appropriate sealing means such as heat sealing, but during this sealing, the outer edge of the seal is placed in the non-sealed area. do. Here, the outer edge of the seal only needs to extend over the non-sealed area, and does not necessarily have to coincide with an outer line of weakness such as a cutting line.

Further, in the third invention, when melt-sealing the container body and the lid, the outer edge of the portion to be sealed is placed in the hole. Also in the third invention, the outer edge of the seal only needs to cover the hole, and the outer edge of the seal portion does not necessarily have to coincide with the cutting line.

In a container manufactured in this manner, when the lid material is pulled from the end toward the center of the container, the flange portion begins to peel off from the edge of the hole that coincides with the outer edge of the seal.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 4, the container body 10 is formed into a substantially rectangular dish shape with a flange portion 13 at the top, and an outer edge 13B of the flange portion 13 has a skirt portion as a bent portion toward the bottom of the body. 14 is formed. A lid material 15 is melt-sealed to the flange portion 13, thereby forming a band-shaped seal portion 16 between the lid material 5 and the flange portion 13.
is formed.

Further, the container body 10 includes at least two layers: an inner layer part (first layer part) 11 facing the main body interior 10B and an outer layer part 12 (second layer part) that is peelably superposed on the inner layer part 11. It is said to have a multilayer structure.

The glabella peel strength of these inner layer portion 11 and outer layer portion 12 is:
The seal strength is 300 to 2000 g/15 ttm, preferably 400 to 1500 g/15 nn, but it is required that the sealing strength is at least smaller than that of the flange portion 13 and the lid member 15.

The inner layer portion 11 of the flange portion 13 has a seal inner edge 16.
A notch 18 as an inner weakening line is formed at a distance of a predetermined distance T on the inner side of A, and a cutting line 19 as an outer weakening line is formed on the outer side of the seal outer edge i6B. It is preferable that the depths of these notches 18 and cutting lines 19 are such that they reach the interface between the inner layer portion 11 and the outer layer portion 12;
In short, when the lid material 15 is opened, the inner layer part 11 and the outer layer part 1
2 can be peeled off from the cut M19 to the notch 18, and the container can be opened.

A hole 20 is formed in the corner of the flange portion 13 as a non-sealing area, and this hole 20 includes a portion corresponding to a part of the cutting line 19, and the edge on the center side of the container meets the outer edge of the seal. It is 16B.

Although this hole 20 is formed in a substantially crescent shape in FIGS. 1 and 2, the specific shape thereof is not limited in the present invention.

Here, the material of the container body 10 is not particularly limited, and may be polyolefin resin, polystyrene resin, polyamide resin, polyester resin, polycarbonate resin, or a mixture thereof, or a thermoplastic elastomer, or various kinds of materials. Additives or inorganic fillers from 5 to
There are resins mixed with 70% by weight, metal foils, etc. Depending on the combination of layers made of these materials, materials suitable for the desired peel strength may be selected.

It is preferable to use materials with excellent strength and heat resistance as the materials for the outer layer 12 and the lid 15 that are in contact with the inner layer 11 of the container body 10.

The preferable material (a) of the inner layer part 11 and the preferable material (a) of the outer layer part 12 are
Examples of combinations of materials (b) include, but are not limited to, the following combinations.

(a) polyethylene resin such as high density polyethylene or low density polyethylene, (b) mixed resin of polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and (b) mixed resin of polypropylene resin and polyethylene resin, (a) low density Polyethylene and (b) high-density polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) mixed resin of polypropylene resin and polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) ethylene-propylene Mixed resin of random copolymer resin, (a) mixed resin of polypropylene resin or polypropylene resin and polyethylene resin, (b) mixed resin of inorganic filler-containing polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and polyethylene resin and (b) high density polyethylene resin containing inorganic filler, (a) homo or random polymerized polypropylene resin and (
b) high-density polyethylene resin containing inorganic filler, and (a) unsaturated carboxylic acid-modified polypropylene resin and (b)
)aluminum.

The container body 10 may be made of two layers made of the above materials, but for the purpose of improving gas barrier properties and reducing deformation when used as a container, it may be made of three layers made of other materials. Examples of layers made of other materials that may be used in the multilayer container described above include resin layers such as ethylene-vinyl alcohol copolymer, polyvinylidene chloride, nylon (polyamide), and polyethylene terephthalate; aluminum vapor-deposited layers; Examples include those having excellent gas barrier properties, such as metal layers such as iron. The layer made of these other materials may be one layer, a multilayer body consisting of two or more layers, or a resin layer containing 10 to 80% by weight of an inorganic filler.

The layer structure of the container body 10 is appropriately selected depending on the sealant layer resin of the lid material 15. For example, when the lid material 15 is a polyethylene sealant layer, in the above combination of resin layers, the high density polyethylene layer is added to the container body. It is preferable to set it as the inner layer part 11 of 10.

In addition, as long as the container main body 10 has a feature of having a release layer inside the multilayer container, a sealing layer, a heat resistant layer, an oil resistant layer, etc. This container body 10, which may have other layers, is made of a coextruded multilayer sheet or resin film, a laminate of sheets, a laminate of resin and metal, and a laminate of resin and metal using the combination of resins described above. It can be obtained by molding, pressure forming, drawing, etc., or by multilayer injection molding, multilayer injection blow molding, multilayer blow molding, etc. Furthermore, it can also be obtained by thermoforming a multilayer film on the inside of the container body 10, such as paper.

As the lamination process, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination can be used. By laminating these materials using adhesives, pressure-sensitive adhesives, etc., a multilayer material having suitable glabella releasability can be obtained.

Further, although the lid 15 is a single layer film in FIG. 3, it may be a multilayer film having two or more layers, and there is no particular limitation. When using multilayer films, single layer plastic film, multilayer film, paper,
A base material made of aluminum foil or a composite material thereof,
The innermost layer (inner layer 11) of the container body 10 is made of polyethylene, polypropylene, ethylene-a-olefin copolymer, ethylene-vinyl acetate copolymer, etc., and a sealant layer made of resin that has easy heat sealability. Those that are suitable for use are preferably used.

To manufacture a container having such a configuration, first, the multilayer sheet is heated, and then the container body IO is formed from the multilayer sheet by, for example, vacuum forming or compressed air forming. Then, before or after filling the inside 10B of the container body 10 with the contents, the notch 18, the cutting line 19 and the hole 2
form 0.

Here, the notch 18, the cutting line 19, and the hole 20 can be formed, for example, by a physical method using a cutting blade or a cutting blade, by a heating method such as hot wire fusing (impulse) or fusing using thermal power, or by a mechanical method using ultrasonic waves. It is formed by an internal vibration method and an internal heat generation method using high frequency. At this time, the cutting depth of the notch 18 and the cutting line 19 may be such that it stops at the inner layer part 11 without reaching the outer layer part 12, as described above, but if it reaches the outer layer part 12, the outer layer part 19 of the inner layer part 11 Reliable peeling from.

Thereafter, the flange portion 13 of the container body 10 and the lid member 15 are melt-sealed. That is, a film fed from a supply roll (not shown) is melt-sealed in a state in which it is overlapped with the flange portion 13. Next, the storage material 15 is punched out.Means for performing this melt sealing include heat sealing, ultrasonic sealing, and other suitable means. At this time, the outer edge 16B of the seal portion 16 formed by melt sealing only needs to be in the hole 20, and does not necessarily need to be along the cutting line 19.

According to this embodiment, the hole 20 is formed in a portion corresponding to a part of the cutting line 19 formed on the flange portion 13, and in this hole 20, the lid material 15 is melted onto the flange portion 13. Since it is not sealed, if the outer edge 16B of the seal covers the hole 20, the inner edge of the hole 20 and the outer edge 16 of the seal
This results in a match with B. Therefore, when opening the container, when the lid material 15 is pulled from its edge toward the center of the container, the glabellar peeling of the flange portion 13 starts from the edge of the hole 20 that coincides with the outer edge 16B of the seal. The container can be opened easily. Furthermore, during the melt-sealing process, if the outer edge 16B of the seal covers the hole 20, deviation of the seal from the cutting line 19 is allowed, which eliminates the need for accurate positioning for the sealing process, improving work efficiency. Furthermore, the seal width can be arbitrarily selected. In addition, the flange part 1
Since the skirt portion 14 is not cut, the rigidity of the container can be ensured. In addition, since the hole 20 was formed as a non-sealing area,
Containers can be manufactured cheaply and easily.

In addition, in the above embodiment, the flange portion 13 of the container body 10
Although the bent portion formed in the skirt portion 14 is used as the skirt portion 14, the bent portion of the present invention is not limited to this, and may be a rib or a curl. A rib 17 formed on the flange portion 13 of the container body 10 of
The tab 17A may be extended to the top.

Further, in the above embodiment, the non-sealed area is the hole 20, but the non-sealed area in the present invention is not limited to this.
6, as shown in FIGS. 6 and 7, the non-sealing region may be a non-thermal adhesive resin layer 21 disposed outside including the cutting line 19. This non-thermal adhesive resin layer 21
consists of a high melting point thermoplastic resin layer or a thermosetting resin layer coated or printed on the flange portion 13 with a thickness of 1 to 5 μm. Here, examples of the thermosetting resin include polyamide, polyester, polyamide-nitrified cotton copolymer, nitrified cotton-silicon resin copolymer, silicone resin, urethane resin, aminoalkyd resin, and the like. According to this, when the seal outer edge 16B crosses the cutting line 19 to the outside, the seal outer edge 16B always coincides with the cutting line 19 because the area where the non-thermal adhesive resin layer 21 is applied is not heat-sealed. Easy opening can be ensured. Furthermore, in the present invention, in place of the non-thermal adhesive resin layer 21, aluminum foil,
A heat-resistant label (not shown) such as paper may be attached to the flange portion 13.

Further, the non-sealing area of the present invention may be one in which the hole 20 and a non-thermal adhesive resin layer 21 are used together, as shown in FIG. According to this, even if the seal outer edge 16B is located inside the cutting line 19 as shown by the arrow P in FIG.
The cover material 15 can be easily peeled off from the inner edge of the seal, and as shown by the arrow Q, the seal outer edge 16B is aligned with the cutting line 19 and the hole 2.
Even if it exceeds 0 to the outside, the area where the non-thermal adhesive resin layer 21 is applied will not be heat-sealed, so the cutting line 1
The cover material 15 can be easily removed from the cover 9.

Further, in the present invention, the inner and outer weakening lines may be notches 18 and cutting lines 19, but may also be recesses (not shown). This recess is formed in the lid material 1 by a sealing member having an edge.
5 is formed by the edge when melt-sealing the flange portion 13.

Furthermore, in the embodiment, the hole 20 may be formed not only when the cutting line 19 is formed but also when the container body 10 is formed.

〔Effect of the invention〕

According to the first invention as described above, there is an effect that the container can be opened easily and workability can be improved. Furthermore, according to the second invention, since the bent portion is formed in the flange portion of the container body, it is possible to add the effect of improving the rigidity of the container. Furthermore, according to the third invention, since the non-sealed region is made into a hole, it is possible to add the effect that the container can be manufactured easily.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is an enlarged front view of the main parts of the embodiment, and FIG.
4 is a sectional view taken along the line IV-IV in FIG. 2, and FIGS. 5 to 8 show modified examples of the present invention. A plan view showing a modified example of the bending part,
FIG. 6 is a plan view showing the main part of a modified example of the non-sealed area, FIG. 7 is a sectional view taken along the line ■-■ in FIG. FIG. DESCRIPTION OF SYMBOLS 10... Container body, 11... Inner layer part, Work 2... Outer layer part, 13... Flange part, 14.17... Skirt part as a bending part, rib, 15... Lid material , 16...
・Seal part, 1st...Notch as inner weakening line, 19
. . . Cutting line as outer weakening line, 20.21 . . Hole as non-sealing area, non-thermal adhesive resin layer.

Claims (3)

[Claims] (1) A container comprising a container body having a flange portion, an inner layer portion facing the inside of the main body, and an outer layer portion peelably superposed on the inner layer portion, and having a lid material melt-sealed to the flange portion. The adhesive strength between the inner layer part and the outer layer part is formed to be smaller than the adhesive strength between the flange part and the lid material, and an inner weakening line is formed inside the flange part, and an outer weakening line is formed outside the flange part. A container characterized in that the lid member forms a non-sealing region in the inner layer portion at a position including a portion corresponding to a portion of the outer line of weakness. (2) The container according to claim 1, wherein a bent portion is formed in the flange portion of the container body. (3) A container body whose lid material is melt-sealed at the flange portion, comprising an inner layer portion facing the inside of the main body and an outer layer portion that is peelably superposed on the inner layer portion, and the inner layer portion and the outer layer portion The adhesive force between the flange and the lid material is made smaller than the adhesive force between the flange and the lid, and an inner weakening line is formed inside the flange.
A container main body, characterized in that cut lines are formed on the outside thereof, and holes are formed at positions of the flange portion including portions corresponding to parts of the cut lines.