JP3969930B2 - Container covered with laminated film lid for easy peel packaging and its manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container covered with a laminated film lid material for easy peel packaging and a method for producing the same. More specifically, the laminated film lid material is heat-sealed and covered with a flange portion of a container (both made of synthetic resin). A container that has an easy peel property and prevents the film lid from tearing when the film lid is peeled off at the sealing portion and removed from the container at the time of opening; It relates to the manufacturing method.
[0002]
[Prior art]
In general, as a container for containing jelly, solid curry, etc., a container with a cover material in which a film cover material is covered on a flange portion of the container, that is, a bottom wall and a peripheral wall standing up around the bottom wall, Containers in a form in which a film-like lid material is heat-sealed in a synthetic resin container body provided with a flange portion extending in the horizontal direction have become widespread.
As a general manufacturing method of this type of container, after the contents are accommodated and the film lid member is heat-sealed to the flange part of the container, the predetermined part where the flange part extends is used as the outer edge. In addition, the film cover material is integrally cut. In this case, the flange part of the container and the film lid are cut by a slitter method that cuts with a sharp cutter, or by a punching machine that moves the male blade (working blade) and female blade (fixed blade) up and down to engage. A method and a method of pulling and cutting while pressing a blade with a die roll cutter are used, and these push-off methods are advantageous from the viewpoint of industrial production.
[0003]
The above film lid material is sealed in a container with a certain degree of sealing strength, and on the other hand, when peeled off and removed from the container at the time of opening, it is necessary to exhibit easy peel properties. However, in reality, when the above-mentioned thin film cover is peeled off, a force is applied to the film, so that the film itself may be torn. For example, the uppermost base provided to give strength When the material layer is torn, this may be transmitted to the lower layer and the entire film may be torn.
In particular, in the case of a film lid material cut by the above-described push-off method, when the outer edge is observed microscopically, when viewed in the horizontal direction, the outer edge has a jagged shape, that is, many notches (V-shaped). It can be seen that this is a state in which a notch is formed. That is, when cut by the push-off method, a notch is inevitably formed on the outer edge of the film lid. Therefore, when such a film lid is peeled off, tearing easily occurs from these notches.
[0004]
When the flange portion and the film lid are cut together, for example, if the cutting is performed with a sharp blade such as a cutter knife, a notch is not formed on the cut surface. However, if cut with the above punching method or die roll cutter method, a notch is formed on the cut surface as described above, so when peeling off the film lid material, it may tear from this notch, and the lid opening operation The problem that becomes difficult. In general, it is usually industrially cut with a punching, press-cut type cutting blade, etc. Therefore, when opening the lid, it is important to solve the problem that the lid material tears from the notch It becomes.
[0005]
[Problems to be solved by the invention]
In such a situation, in view of the prior art, the present inventors, in the container with a lid material, when the film lid material is peeled off at the seal portion and opened, the film lid material is not torn. As a result of intensive research with the goal of developing a new film lid and container for that purpose, at least a part of the cut portion of each layer or the outer edge between layers of the container and lid after covering The present inventors have found that the intended purpose can be achieved by forming an unsealed peeled portion, and the present invention has been completed.
The present invention is a container in which a film lid material is heat-sealed on a flange portion of a container and has an easy peel property when opened, and the container with a lid material that prevents the film lid material from tearing. It is intended to provide.
[0006]
[Means for Solving the Problems]
The present invention for solving the above-described problems comprises the following technical means.
(1) A lid covered with a heat-sealing laminated film lid material for easy peel packaging comprising a sealant layer (a) and a base material layer (d) that are in contact with the heat-sealing surface. In the container with a material , a peeling portion is formed on the outer edge portion of the heat seal portion, the flaking portion of the vessel, the sealant layer (A), and the base material layer (D) at one or more of the layers. Alternatively , when forming a peeling portion for delamination between the sealant layer (a) and the base material layer (d) and opening, the film lid material is peeled off at the seal portion, and any of the above peelings The container with a lid material described above , wherein peeling of the part occurs and the opening force is dispersed in these parts .
(2) After covering the flange portion of the container with heat-sealing the laminated film lid material for easy peel packaging comprising the sealant layer (a) and the base material layer (d) in contact with the heat sealing surface A container with a lid material in which the film lid material and the flange portion are integrally cut by a punching method such as punching, die roll cutter, etc., and the flange portion of the container and the sealant layer ) and substrate layer (each of the flange portion of the formation or vessel peeling unit for the cohesive failure in one or more layers of two), the sealant layer (a) and one or more layers of base material layer (d) When forming a peeling part for delamination and opening, in addition to the film lid material being peeled off at the seal part, peeling of any of the above peeling parts occurs, and the opening force is dispersed in them. With the above lid material Container.
(3) An intermediate layer (c) for bonding the sealant layer (a) and the base material layer (d) is provided, and the flange portion of the container, the sealant layer (a), the intermediate layer (c) and the base material layer ( The container according to claim 1 or 2, wherein a peeling portion is formed in one or more of each layer of d) or one or more of each layer.
(4) The peeling part is formed in two or more layers between each of the flange part of the container, the sealant layer (b), the intermediate layer (c) and the base material layer (d). container.
(5) A method for producing a container with a lid according to claim 1 or 2, wherein one or more layers between each of the sealant layer (b), the intermediate layer (c) and the base material layer (d) are provided. Film cover material with a weak seal part with weaker sealing strength than that of other layers is heat sealed on the flange part of the container, and then the film cover material is punched, pressed by a die roll cutter, etc. And the manufacturing method of the container with a lid | cover material characterized by cut | disconnecting a flange part integrally and forming a peeling part.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in more detail.
The basic configuration of the present invention will be described. The first aspect of the present invention is that one or more layers between each of the flange portion of the container, the sealant layer (A), and the base material layer (D) in the container after being covered. Forming a peeling portion (unsealed portion = delamination type). Further, according to the second aspect of the present invention, one or more of the flange portion, sealant layer (ii) and base material layer (d) of the container in the container after being covered are separated from each other (unsealed portion = Agglomeration exfoliation type).
Moreover, the 3rd aspect of this invention is forming a peeling part in two or more of each said interlayer.
[0008]
The laminated structure of the lid is arbitrary as long as it includes the sealant layer (A) and the base material layer (D), and is not particularly limited.
In addition, regarding the position where the peeling portion is formed, it is arbitrary in which layer or in which layer the peeling portion is formed, and is not particularly limited, but preferably, the sealant layer (b) and the base material layer (d) It is preferable to form a peeled portion between these layers, that is, between the base material layer (d) and the lower layer. When the peeling portions are formed in each layer and two or more layers, tearing of the film lid can be further avoided.
Also in the case where the intermediate layer (c) is provided, it is preferable to form the peeling portion between the base material layer (d) and the lower layer, as in the above basic configuration. It is preferable to form two or more peeling portions.
[0009]
The material of the film is, for example, as a sealant layer (A), a polypropylene-polyethylene blend polymer alloy, as an intermediate layer (C), as a polyethylene resin such as polyethylene or linear low density polyethylene, as a base material layer (d) Polyester such as polyethylene terephthalate, polypropylene, polyethylene, polycarbonate, polyamide, aluminum foil, simple paper, or a composite material of two or more of these is exemplified. A material obtained by depositing an inorganic substance such as alumina on these materials can also be used as the base material layer (d).
Further, as the support layer (b), a polypropylene mixture such as a mixture of a random copolymer of polypropylene and polyethylene, and a printing layer (e) coated with an anchor coat are exemplified as preferable examples. The respective layers are not limited to the film material, and can be used in the same manner as long as they have the same effect as the film material. As a container, it is desirable to have a flange having an upper part serving as a heat sealing surface made of polypropylene. However, as long as the operation of the present invention is achieved, the container is formed in an arbitrary shape using an arbitrary material and a laminated sheet material. Can be.
[0010]
In the fourth aspect of the present invention, one or more layers between each of the flange portion, sealant layer (b), intermediate layer (c) and base material layer (d) of the container are sealed more than those of the other layers. A film lid material in which a weak seal portion with low strength is formed is manufactured.
The weak seal portion is formed by selecting a material for each layer including an adhesive, selecting conditions for laminating each layer by various laminating methods, and the like. In this case, a printing layer (e) can be provided, and a weak seal part can be formed between the base material layer (d) and the printing layer (e).
The preferable site | part which forms a weak seal part is the same as the site | part in the case of forming the said peeling part.
Next, the film lid is heat-sealed on the flange portion of the container.
Thereafter, the flange portion and the film lid material are integrally cut by a punching method such as punching or die roll cutter.
[0011]
In this case, when the film lid member having the weak seal portion is sealed to the flange portion of the container, that is, when both are integrally trimmed (punched) at the seal portion, the force that is pulled up and down on the cut surface Is applied to the cut surface, that is, the outer edge portion of the seal portion, and the weak seal portion is peeled off to form a peeling portion.
The apparatus used for these treatments may be a general apparatus, and is not particularly limited. For example, as a punching apparatus, for example, “Food Packaging Manual” Japan Packaging Technology Association, page 857 ( 1998), a trimming device similar to the trimming device shown in FIG. 5 of JP-A-11-105929, etc., and a cutter device described in pages 860 to 863 above. A device similar to the above device is exemplified. A die roll cutter type device is effective from the viewpoint of industrial productivity.
According to the method of the present invention, there is an advantage that the container with a lid material having the above basic configuration can be industrially produced with repeatability.
[0012]
Next, the cut surface that occurs when the flange portion and the sealing portion of the film lid member are integrally cut will be described. FIG. 1 shows a structure of a cut end face in the case of a slitter method in which cutting is performed with a sharp blade such as a cutter knife. In this method, since the notch and the branch (peeling portion) are not formed on the cut end face, the film lid material does not tear from the notch when opened. FIG. 2 shows a structure of a cut surface in the case of a punching method in which punching is performed with a male blade (working blade) and a female blade (fixed blade). In this method, a notch is formed on the cut end surface, and the formation of the branch (peeling portion) is determined by the interlayer strength of each layer, and the cut end surface is squeezed by a blade and tends to increase the branch. If the laminate (laminate) of each layer of the film lid is weak, a peeling part will be formed between each layer, and if the seal is weak, a peeling part will be formed between the sealant layer and the flange part. Occurs, and the film lid tends to be difficult to tear from the notch. However, if both the laminate and the seal are strong, no branch is formed, and the film lid tends to tear when opened.
[0013]
FIG. 3 shows the structure of the cut surface in the case of a die roll cutter system that pulls away while pushing the blade. In this method, notches frequently occur on the cut end face, and the cut end face is elongated by the blade and cuts, so that it is difficult to form a branch. If the lamination of each layer of the film lid is weak, a peeling part is formed between each layer, and if the seal is weak, a peeling part is formed between the sealant layer and the flange part. The film lid becomes difficult to tear. However, if both the laminate and the seal are strong, no branch is formed, and the film lid tends to tear when opened.
In the case of the above punching method and die roll cutter method, if both the laminating strength and the sealing strength are extremely weak, branches are formed at two or more locations between each layer or interlayer, so that the film lid material is more difficult to tear when opened (FIG. 4). ). Among these, the film cover material is hardly broken at the time of opening when both the lamination strength and the seal strength are extremely weakened by the punching method.
[0014]
[Action]
In the present invention, the flange portion of the container and the film lid material are integrally cut to form a peeling portion in each layer or one or more of the layers. Therefore, when the opening tab is pulled during opening, the film lid material is flanged. In the part peeled off from the part, for example, if the lamination is weak, delamination of the base material and the sealing layer starts from the peeling part, and the sealing layer is peeled at the interface while the opening force is dispersed. It is avoided that tearing occurs. In other words, delamination between the base material and the sealing layer starts from the peeling part, the opening force is dispersed, the position of the power point that was in the notch part is shifted (the force to tear from the notch part is absorbed), The tearing of the film lid is suppressed (FIG. 7).
[0015]
【Example】
Next, the present invention will be specifically described based on examples.
Example (1) Production of Film Cover Material and Blend Polymer Alloy (Mitsubishi Chemical Co., Ltd .: Trade Name “VMX”) Containing Polypropylene and Polyethylene, Mixture of Random Copolymer of Polypropylene and Polyethylene, Linear Low Density polyethylene was bonded together by a coextrusion method to form a film. Furthermore, the linear low-density polyethylene side of the above film is overlapped with polyethylene terephthalate vapor-deposited with alumina and a printed layer, and an anchor coat is applied to the printed layer side, and then bonded with molten polyethylene to form a film lid. Produced.
[0016]
The obtained film material was a blend polymer alloy of the above-mentioned polypropylene-polyethylene (sealant layer (ii)) 15 μm, a mixture of polypropylene (support layer (b)) 15 μm, linear low density polyethylene (intermediate layer (c)) From a laminated structure of 10 μm, polyethylene (intermediate layer (c)) 15 μm, printing layer (e) (thickness is included in the thickness of the base layer (d)) and polyethylene terephthalate (base layer (d)) 16 μm (FIG. 6).
Except for not vacuum packaging, using a packaging machine having the same structure as the apparatus described in pages 860 to 863 of the above “Food Packaging Manual”, the flange portion of a polypropylene tray container filled with Carreau And then heat-sealed at 145 ° C., 3 kg / cm ² for 1 second.
[0017]
(2) Trimming Next, using a die roll cutter, the flange portion and the sealing portion of the film lid material were integrally cut by a push-off method, and each package, that is, a container with a lid material was completed. A photograph of the cut cross-sectional structure in the vertical direction of the peripheral edge of the container with a lid is shown in FIG. In the drawing, the uppermost layer is the base material layer (d), the lower layer is the intermediate layer (c) and the sealant layer (b), and the lower layer is the flange portion of the container. It can be seen that a peeling portion is formed between the layers (c).
[0018]
(3) Seal strength In this container with a lid material, the seal strength of each layer constituting the lid material was as follows.
A: Sealing strength between container flange and sealant layer (A) 6N
B: Seal strength between intermediate layer (c) and base material layer (d) 1.5N
The film lid has a gas barrier property, and when peeled off the seal part at the time of opening, it has an easy peel property due to interfacial peeling, and has a good performance that the film lid does not tear. .
[0019]
Due to the configuration of the container with the lid material, when the base material layer is torn when the opening force is applied to the notch (V-shaped notch) formed on the outer edge of the film lid material at the time of opening, it is slightly delayed. The peeling between the layers or layers occurs from the peeling portion in the vicinity of the notch, the opening force is dispersed in these, the film lid material tears from the notch, and the problem that the entire film is torn is reliably avoided, and It has been found that it is possible to achieve stable and uniform easy peel.
[0020]
【The invention's effect】
As described above in detail, the present invention provides a laminate film lid for easy peel packaging comprising a sealant layer (a) and a base material layer (d) that are in contact with a heat sealing surface. A container with a lid material heat-sealed on the outer edge of the heat-sealed portion, one or more of each of the flange portion, sealant layer (a) and base material layer (d) of the container, or According to the present invention, the container with a lid and the manufacturing method thereof are characterized in that one or more peeling portions are formed between each of the layers. According to the present invention, 1) cut by a punching method or a die roll cutter method In the container having the container flange portion and the film lid material, the film lid material can be reliably prevented from tearing from the notch formed on the cut surface at the time of opening. 2) The container with the film lid material When removing the seal part at the time of opening, it is possible to provide a container with a lid material that has an easy peel property and does not tear the film lid material. 3) A container with a film lid material is produced. In the process, the peeling part can be formed by a simple operation. 4) A film lid material and a container advantageous for industrial production can be provided.
[Brief description of the drawings]
FIG. 1 shows a cut section of a container flange and a lid material in the case of a slitter method.
FIG. 2 shows a cut section of a container flange and a lid material in the case of a punching method.
FIG. 3 shows a cut cross section of a container flange and a lid in the case of a die roll cutter system.
FIG. 4 is an explanatory diagram showing a branch formed when both the lamination strength and the sealing strength are weak.
FIG. 5 shows a photograph of a cut cross-sectional structure in the vertical direction of the peripheral edge of a container with a lid produced by the method of the example of the present invention.
FIG. 6 shows the structure of a film lid of a container with a lid according to the present invention.
FIG. 7 is an explanatory view showing an unsealing configuration at the time of unsealing the container with a lid according to the present invention.

Claims (5)

A container with a lid material in which a laminated film lid material for easy peel packaging comprising a sealant layer (a) and a base material layer (d) that are in contact with the heat seal surface is heat-sealed on the flange portion of the container and covered. In the outer edge portion of the heat seal portion, a peeling portion for cohesive peeling is formed on one or more of each of the flange portion of the container, the sealant layer (b) and the base material layer (d) or the sealant layer. (A) When the peeling part which peels between layers of a base material layer (d) is formed and opened, in addition to the said film cover material peeling at a seal | sticker part, peeling of one of said peeling parts And the opening force is dispersed in these containers. Punched after covering the flange part of the container with heat-sealing laminated film lid material with a sealant layer (a) and base material layer (d) that are in contact with the heat-sealing surface. A container with a cover material in which a film cover material and a flange portion are integrally cut by a press-cut method using a die roll cutter or the like, and at the outer edge portion of the heat seal portion, the flange portion of the container, the sealant layer (A) and the base Forming a peeling portion for cohesive peeling on one or more of each layer of the material layer (d) or delamination at one or more layers between the flange portion of the container, the sealant layer (b) and the base material layer (d) When the peeling portion is formed and opened, in addition to the film lid member being peeled off at the seal portion, peeling of any of the peeling portions occurs, and the opening force is dispersed in these. Container with lid    An intermediate layer (c) for bonding the sealant layer (b) and the base material layer (d) is provided, and the flange portion of the container, the sealant layer (b), the intermediate layer (c) and the base material layer (d) The container according to claim 1 or 2, wherein a peeling portion is formed in one or more of each layer or in one or more of each layer.    The container according to claim 1, 2 or 3, wherein peeling portions are formed in two or more layers of each of the flange portion, sealant layer (b), intermediate layer (c) and base material layer (d) of the container.    It is a method of manufacturing the container with a lid | cover material of Claim 1 or 2, Comprising: One or more between each layers of sealant layer (a), an intermediate | middle layer (c), and a base material layer (d), and other Film cover material with a weak seal part with weaker sealing strength than that between layers is heat-sealed on the flange part of the container, and then the film cover material and flange part are punched, pressed by a die roll cutter, etc. A method for producing a container with a lid material, wherein the peeling part is formed by integrally cutting the substrate.

Images