JPH03148465A - Easy-opening container and easy-opening packaging and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain an easy-opening container with a thick flange by a method wherein a container is formed of a multiples-layer sheet consisting of peel layer A and layer B so that the layer A becomes the outermost layer, an annular flange is formed by laminating the multiple layer sheet in the order of AB and BA and the top AB layer of the annular flange has an enough width for making a cover material adhere on it. CONSTITUTION:An easy-openable container is formed of a multiple-layer sheet so that a peel layer A becomes the outermost layer. A flange is formed by folding the multiple-layer sheet so that the top and rear faces of the flange are the peel layer A, and then cut so as to separate the layer A on the top face from the layer A on the rear face. Therefore, the layer A of the flange is not connected to the inner layer of the container. When a package is opened, peeling of the layer A starts from the cut part and the annular layer A is removed from the container together with the cover material, so that the package is opened. As a layer B is folded to form an upper and an lower layer which are continuous, the upper layer and the lower layer are not peeled off, and the container is pleasant to touch with lips as the flange has a round on the brim.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an easy-to-open container and an easy-to-open package used for packaging foods and the like. The invention also relates to a preferred method for their production.

(Conventional technology) Looking at the characteristics of recent eating habits, notable examples include a tendency toward ``authenticity'' and ``unbalanced eating.''
Therefore, there is a need for containers that can withstand retorts for authentic cooking, and because of the need for individual servings, there is a need for containers that can be easily opened by the elderly and children.

An example of a container that has both of these functions is a simple beer container in which the flanged container body has a multilayer structure, the top film is a release layer, and the sealing surface with the lid is different from the opening surface of the container. Kaisho 62-25136
In this container, the force required to peel off the lid of the container from the outside is sufficient after 1 kg/15 mm width.

In order to deal with internal pressure, stress caused by internal pressure can be reduced by limiting the adhesive area between the lid and the release layer of the container body to the edge of the flange, and by making a notch in the release layer and creating a gap between the notch and the adhesive area. It has a structure in which the adhesive is concentrated at the bonded area, which allows it to withstand internal pressures of 2.3 kg/d or more. However, with this container, there are problems such as quality control is difficult because it is necessary to insert the notch with great precision, and the flange is not crab-ringed, so when drinking soup etc. from the container, the taste is unpleasant. be.

On the other hand, the packaging container described in Japanese Utility Model Application Publication No. 1-96868 has a problem of insufficient pressure resistance.

[Problem to be solved by the invention]

The present invention aims to provide an easy-to-open container that is relatively easy to control for quality, has a pleasant texture, and has a round and thick flange. Another object of the present invention is to provide an easy-to-open package that is excellent in both sealability and unsealability by using the above-mentioned easy-to-open container. A further object of the present invention is to provide a suitable method by which the above-mentioned easy-to-open containers and easy-to-open packages can be molded regardless of the shape of the mouth of the container.

[Means to solve the problem]

The inventors of the present invention have conducted extensive research to solve the above-mentioned problems, and have discovered that the object can be achieved by making the container an easy-to-open container with a flange having a specific structure. It was completed.

That is, the present invention provides a container having a flange portion at the periphery of the opening, in which the container has at least a release layer (A) and (A).
A multilayer sheet consisting of layers (B) in contact with (A) is formed so that (A) becomes the outermost layer of the container, and the flange part connects the multilayer sheet in the order of (A), (B), (B), and (A). To provide an easy-to-open container having a laminated layer structure, wherein the upper parts (A) and (B) are annular layers having a width that allows a lid material to be adhered to seal the container. It is something.

The easy-open container of the present invention is sealed with a lid material covering the opening to become an easy-open package. The top layer of the flange portion of the container is a release layer (A), and the lid material is adhered to this (A). Therefore, the outer edges (A) and (B) of the flange portion need to be an annular layer having a width sufficient to adhere the lid material and seal the container. °If the width is too narrow, the sealing performance will be poor. Further, (A) is not connected to the outer edge of the flange portion of the container, and is separated from the container together with the lid when the package is opened.

In particular, in a container having a flange portion around the opening, the container has at least a release layer (A) and a layer (A) in contact with (A).
A multilayer sheet consisting of B) is formed so that -(A) is the outermost layer of the container, and the flange part is formed by folding the multilayer sheet so that the upper and lower surfaces of the flange part are (A). ) is preferably formed by cutting the flange portion so that it is separated into an upper surface layer and a lower surface layer.

The multilayer sheet forming the above-mentioned container is a multilayer sheet made of at least two or more synthetic resins, a release layer (A) and (B) in contact with (A), and a container having a flange portion at the periphery of the opening. Any material that can form a . , it is also possible to use a multilayer sheet in which another layer (C) is laminated on the side opposite to (A) of (B), (C) includes a gas barrier layer, etc. (C) It may be a single layer or a multilayer, and the layers other than the inner layer of the container may be made of metal foil.

Also, the peel strength between (A) and (B) is zob/15m
The width is preferably less than 300 kg/min (when pulled, the same applies hereinafter), more preferably 0.3 to 1.5 kg/15 m width, and when the width exceeds 2.0 kg/15 m, the multilayer sheet is The ease of opening of an easy-to-open package in which a lid material is adhered to an easy-to-open container may deteriorate.

The easy-to-open container of the present invention is formed from the above multilayer sheet so that (A) is the outermost layer of the container. The flange portion is formed by bending the multilayer sheet so that the upper and lower surfaces of the flange portion become (A) and cutting the sheet so that (A) is separated into an upper surface layer and a lower surface layer of the flange portion. . By adopting such a structure, the flange portion can be made slightly thicker than the outer edge portion of the flange portion of the container. The thickness of the flange part is preferably 30 to 4000#m.By making the flange part thick, even if the contents of the container are heated, the flange part will not heat other parts, so hold the container by grasping the flange part. Can be done. Also,
When the package is opened, the bent flange (A) is cut so as to be separated into an upper layer and a lower layer, and (A) is not connected to the inner layer of the container. Peeling of (A) begins from this cutting position, and the annular (A) is peeled off from the container together with the lid, and the package is opened. In other words, unlike conventional products, there is no need to provide a notch in (A) for cutting when opening the package.
, it is possible to obtain an easy-to-open container with a clean appearance.

Here, at the flange part, (A) is cut so as to be separated into the upper layer and the lower layer of the flange part at the outer edge of the flange part, and the bent upper layer and lower layer of (B) are connected. B) The upper layer and the lower layer do not separate, and the container has a rounded periphery around the flange, which is preferable, as if the flange had been curled.

In (A) of the upper surface layer of the flange part of the above-mentioned easy-open container,
The lid material that covers the container opening and seals the container is (A) and (B).
) is bonded with an adhesive force greater than the peel strength between the two, resulting in the easy-open package of the present invention.

By adhering the lid material with such adhesive strength, when opening the package, the peeling surface is aligned with the lid material and the top surface of the flange (A).
It can be placed between the layers (A) and (B) instead of between the layers (A) and (B). Here, it is preferable to provide a non-adhesive part on the opening side of the flange without adhering the lid material to the entire upper surface of the flange part, from the viewpoint of pressure resistance of the package. Even if the materials are firmly adhered, the package can be easily opened, and an easy-to-open package with excellent sealability and unsealability can be obtained. Lid material and (A
) Various adhesion methods such as heat sealing can be used for adhesion. If necessary, an adhesive layer may be provided between (A) and the lid material.

As the lid material, a flat film made of synthetic resin or a drop lid is suitably used. From the viewpoint of adhesion, it is preferable that the adhesive portion between the container and the lid material be made of the same material.

The above-mentioned easy-to-open container is suitably manufactured by the following method.

That is, the width of the periphery of the opening is wider than the width of the desired flange so that (A) is the outermost layer. Form a container with a brim narrower than twice the width of the flange part, bend the brim at the desired flange width position so that (A) becomes the upper and lower surfaces of the flange part, and (A)
Cut the flange part so that it is separated into an upper surface layer and a lower surface layer at the bent part.

This will be explained below based on the drawings.

FIGS. 1 to 4 are cross-sectional explanatory views illustrating an example of a method for manufacturing an easy-open container and an easy-open package according to the present invention.

First, at least the release layer (A) and the layer in contact with (A) (B
) A container having a brim at the periphery of the opening with a width wider than the width of the desired flange and narrower than twice the width of the flange, such that (A) is the outermost layer, is formed from a multilayer sheet consisting of (A) using a vacuum forming method. , formed by pressure forming method or vacuum pressure forming method (
1), l is the release layer (A), 2 is the layer in contact with (A) (
B), 3 is a mold, 4 is a cut portion, 5 is a collar, and 6 is a container side wall. The brim 5 may be formed horizontally.
As shown in Fig. 1, the area where the width from the container side wall 6 is the width of the desired flange portion is formed downward from the horizontal direction, and the outer periphery thereof is formed upward from the horizontal direction, and cut at a predetermined width position. It is preferable to form the cut portion 4 into a desired tail shape.The cut portion 4 is preferably formed approximately horizontally.

Next, the brim is bent at the desired width of the flange so that (A) becomes the upper and lower surfaces of the flange. If the shape of the brim is as shown in Fig. 1 above, the brim can be bent by sandwiching the container between the upper and lower molds and heating and pressurizing the upper and lower empty parts (Fig. 2).
In this case, it is best to preheat the container to 60-70°C! 7 is a lower mold, 8 is a convex part, 9 is an upper mold, IO is a heat insulating part, and 11 is a heat part, which are preferable in terms of time reduction. First, the container having the brim 5 obtained in the previous step is placed in a lower mold having a recess into which the container can be inserted. The inner diameter of the lower mold part is approximately the same as the outer diameter of the container side wall 6, and the lower mold part has a convex part 8 at a position corresponding to the boundary between the container side wall 6 and the brim 5. Preferably, the structure is such that the container can be correctly inserted into the mold. In this state, the container with the brim is heated and pressurized with the upper mold 9. The upper mold 9 preferably has a heat insulating part 10 at a position corresponding to the opening of the container, and a heat part 11 having a width wider than the desired flange part around the heat insulating part 11. The heat insulating part 10 has a convex shape. It is preferable that the outer periphery of the tip of the convex part is rounded, and the heat insulating part 10 and the heating part 1
1 is preferably treated with Teflon to prevent welding of the container. By this heating and pressurization, the area formed downward from the horizontal direction of the collar 5 is lifted to near horizontal,
The area formed upward from the horizontal direction of its outer periphery is (A
) are bent so that they become the top and bottom surfaces of the flange part. The folded and overlapping upper and lower parts (B) are heat-sealed.

Next, (A) is cut at the bent portion so as to be separated into an upper surface layer and a lower surface layer of the flange portion. Preferably, the cutting is performed by a cutting means consisting of a pair of male and female blades having annular blades around the periphery.

The male and female blades have opposing blade surfaces. When (A) is cut at the bent portion using this cutting means, the cut surface is not vertical but has a mountain shape protruding in the horizontal direction.

As a result, the periphery of the flange portion is rounded, resulting in a pleasant texture. In other words, an effect similar to curling the flange portion can be obtained. In addition, (B) may also be cut by this cutting, but it is preferable not to completely cut off the bent part of (B), but to connect (B) at the bent part. In this case, the cutting means As shown in FIG.
A) is preferably separated from the periphery of the flange. As a cutting means, a male blade 12 and a female blade 13 are provided in the upper and lower molds for heating and pressurizing, respectively, as shown in FIGS. 2 and 3. , bending the brim, and cutting (A) can be carried out in one step, which is preferable. That is, the same effect as notching and curling can be obtained in one step.

The method of manufacturing an easy-to-open container of the present invention is a simple method of folding the brim and cutting the MIII portion, and does not require the conventional process of notching the flange, which requires precision. , quality control can be easily performed. Further, since the flange portion is formed by folding the brim, a desired easy-to-open container can be obtained regardless of the shape of the mouth of the container. Furthermore, the length of the flange portion can also be adjusted.

Furthermore, on the upper surface (A) of the flange part of the easily openable container obtained above, a lid material 1 for covering the opening of the container and sealing the container is added.
The easy-to-open package of the present invention can be manufactured by bonding 5 with adhesive strength greater than the peel strength between (A) and (B) (Fig. 4) [Example] Hereinafter, the easy-open package of the present invention The invention will be described in detail based on examples, but the invention is not limited thereto.

Example 1 HDP was produced using a random PP-HDPE coextrusion sheet (HDPE layer thickness 20 #1111) with a thickness of 1.0 mm.
The container shown in FIG. 1 was formed by vacuum-pressure forming so that the E layer was on the outside. Next, this container was placed between upper and lower molds having annular male blades 12 and female blades 13 shown in FIG. 2, and heated and pressurized.

The pressure at this time was 4.6 kg/cj, and the container surface temperature was 160 to 170°C. Here, the heat insulation part 1 of the upper mold 9
2 gaps are provided between 0 and the heat section 11, and the insulation section 10 is
Cooling water was run inside. In addition, the lower mold was used while sucking the recessed part. By this heating and pressurization, the flange portion of the container was folded so that the upper and lower surfaces became HDPE layers, and at the same time, the HDPE layer was cut at the bent portion so as to be separated into an upper surface layer and a lower surface layer of the flange portion. As a result, an easy-to-open container with a flange thickness of 1.6 mm was obtained.

Furthermore, a lid material that covers the container opening and seals the container is attached to the HDPE layer on the upper surface of the flange portion of the easy-open container obtained above, with an adhesive strength greater than the peel strength between the HDPE layer and the PP layer. By adhering, a desired easy-open package was obtained. HDPE flat film with a thickness of 0.4 mm was used as the lid material.

When the internal pressure strength of this easy-to-open package was measured, it was found to be 13
kgf/d. Furthermore, when the peel strength of the lid material was measured upon opening, it was found to be 1.0 kg/15 width.

Furthermore, regarding the easy-open package of the present invention, the incidence of defective products was investigated through quality control. The results are shown in Table 1.

A sensory test was also conducted regarding the flange feel. There were 18 test subjects, and the evaluation was made on a five-point scale from 1 to 5, with the higher the number, the better the texture. The results are shown in Table 1.

Furthermore, regarding the thickness of the flange portion, boiling water at 92° C. was placed in the container, and the container was held at the flange portion between the index finger and index finger as shown in FIG. 6, and the holding time was measured. The number of subjects was 18. The results are shown in Table 1.

Comparative Example 1 Using the same coextruded sheet as in Example 1, a container having the same size as the container obtained in Example 1 was formed such that the HDPE layer was the innermost layer of the container. Next, a notch was made in the innermost HDPE layer of the flange portion, and a lid material was adhered to the flange portion outside the notch to obtain a package. The thickness of the flange portion was 0.8 mm. When this package is opened, the innermost layer is peeled off together with the lid, and the package is opened by cutting with a notch. This package was evaluated in the same manner as in Example 1 for the incidence of defective products, the texture of the flange portion, and the container holding time. The results are shown in Table 1.

Table 1 Incidence rate of defective products 1 5 to 10 (%) Flange part 4.8 1, 2 Edge texture 0
) Capable of holding container: 60 or more & 2 hours 0) (seconds) [Effects of the Invention] According to the present invention, it is possible to obtain an easy-to-open container that has a rounded and thick flange that is pleasant to the touch. Also,
By using the above-mentioned easy-to-open container, it is possible to obtain an easy-to-open package that is excellent in both sealability and unsealability. Furthermore, the above-described easy-to-open container and easy-to-open package can be molded regardless of the shape of the container 60. This method of manufacturing an easy-to-open package allows for easy quality control.

[Brief explanation of the drawing]

FIGS. 1 to 4 are cross-sectional explanatory views illustrating an example of a method for manufacturing an easy-open container and an easy-open package according to the present invention. FIG. 5 is a perspective view showing an example of the cutting means in (A). FIG. 6 is an explanatory diagram showing the evaluation method of the example. Explanation of symbols 1 Peeling layer (A) 2 Layer in contact with (A) (B) 3 Molding mold 4 Cut portion 5 Brim 6 Container side wall 7 Lower mold 8 Convex portion 9 Upper mold

Claims (1)

[Claims] 1. In a container having a flange around the opening,
The container is made of a multilayer sheet (A) consisting of at least a release layer (A) and a layer (B) in contact with (A).
is formed to be the outermost layer of the container, and the flange has a layer structure in which the multilayer sheets are laminated in the order of (A), (B), (B), and (A), and the upper (A) ( An easy-to-open container characterized in that B) is an annular layer having a width to which a lid material can be adhered to seal the container. 2. In a container having a flange on the periphery of the opening,
The container is made of a multilayer sheet (A) consisting of at least a release layer (A) and a layer (B) in contact with (A).
is the outermost layer of the container, and the flange portion is formed so that the multilayer sheet is formed so that the upper and lower surfaces of the flange portion are (A).
An easy-to-open container characterized in that it is formed by bending the container so that (A) becomes separated into an upper surface layer and a lower surface layer of the flange portion and cutting the container so that the container (A) is separated into an upper surface layer and a lower surface layer of the flange portion. 3. A claim in which (A) of the bent flange part is cut so as to be separated into an upper layer and a lower layer at the outer edge of the flange part, and the bent upper layer and lower layer in (B) are connected. The easy-to-open container according to item 2. 4. The multilayer sheet has another layer (C) on the side opposite to (A) of (B).
) is a laminated container. 5. Peel strength between (A) and (B) is 2.0 kg/15
Claim 1: mm width (when pulled at 300 mm/min) or less
Or the easy-to-open container according to 2. 6. A lidding material that covers the opening of the container and seals the container is provided on the upper surface (A) of the flange portion of the easy-open container according to claim 1 or 2, and has a peel strength higher than that between (A) and (B). Easy-to-open packaging bonded with high adhesive strength. 7. At least a release layer (A) and a layer (B) in contact with (A)
A multilayer sheet consisting of (A) is formed as the outermost layer into a container having a brim at the periphery of the opening with a width wider than the width of the desired flange part and narrower than twice the width of the flange part, and the brim is Bend (A) at the desired flange width position so that (A) becomes the upper and lower surfaces of the flange, and cut (A) at the bent part to separate it into the upper and lower layers of the flange. A method for producing a characteristically easy-to-open container. 8. The method for manufacturing an easy-to-open container according to claim 7, wherein the cutting means comprises a pair of male and female blades each having an annular blade at the bent portion of (A). 9. A lid material for covering the opening of the container and sealing the container is placed between (A) and (B) on the upper surface of the flange portion of the easy-to-open container obtained in claim 7 or 8. A method for producing an easy-to-open package that is bonded with adhesive strength greater than peel strength.