JPS6344466A - Sealing packaging vessel - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging container in which a lid is heat-sealed to the opening of a container body made of a highly rigid material such as glass, ceramics, or metal.

[Conventional technology and its problems]

For example, when the lid of a container for storing fluids is sealed by heat sealing, if the heat seal area near the opening of the container body is contaminated by the contents, the heat seal will usually be incomplete. This often results in poor sealing.

However, if the opening of the container body is softened by heat, for example, a method commonly called a ring seal, that is, by providing narrow protrusions or ridges on a heat-sealing hot plate, the protrusions can be softened by the protrusions. By applying pressure, the opening softens and grooves are formed, and at the same time removes deposits, complete heat sealing can be achieved even if the opening is somewhat contaminated by the contents. .

However, the above method cannot be applied to a container body made of glass, ceramics, metal, etc. that does not soften due to the heat of heat sealing.

[Problem of invention]

Therefore, an object of the present invention is to provide a structure that allows a packaging container with good sealing performance to be obtained, regardless of contamination of the opening, even if the container body is made of a highly rigid material such as glass. It is.

[Means of problem solving]

In order to solve the above-mentioned problems, according to the present invention, a lid having a heat-sealing agent layer provided on the base material is heat-sealed to the opening of a container body made of a highly hard material that does not soften due to the heat of heat-sealing. In the container, the opening of the container body has a diameter of 0.5 to 10 mm, more preferably 1 to 10 mm.
A rounded portion having a radius of curvature of 7 mm was formed, the heat-sealing layer was made of a thermoplastic resin with a thickness of 6 μm or more, and the lid was heat-sealed to the rounded portion to form a sealed container.

[Effect]

As mentioned above, since the lid is heat-sealed to the rounded part provided in the opening, even if the opening is contaminated with the contents, the pressure applied when placing the lid on the opening and heat-sealing will protect the lid. Contaminants are pushed out around the contact area. Further, when opening the lid, when the lid is pulled upward, the lid is peeled off at approximately 90 degrees from the rounded portion, and the lid can be easily opened with a small peeling force.

〔Example〕

As shown in FIG. 1, an opening 2 of a container body 1 made of a highly hard material such as glass, ceramics, or metal is sealed with a lid 10 to form a sealed container.

The lid 10 is provided with a heat sealing agent JiJ12 made of a thermoplastic resin having a thickness of 6 μm or more on a base material 11 made of a single substance such as porcelain, metal foil, or a synthetic resin film or a composite thereof.

The flange portion where the lid 10 is heat-sealed has a thickness of 0.
It is important that the surface has a radius of curvature of 5 to 10 fi, preferably 1 to 7 fi, and the portion that is not heat sealed may be flat or curved.

Note that the radius of curvature does not necessarily have to be constant, and may be partially different within the above range.

In order to heat-seal the lid 10 to the rounded portion R as described above, for example, a method of thermocompression bonding using a heat-sealing hot plate containing an elastic material such as heat-resistant rubber is adopted.

When applying pressure during heat sealing, it is important to apply pressure to the entire curved surface in one step; for example, it is not preferable to apply pressure gradually from the outside to the inside.

When flexible i[10 is heat-sealed to the rounded part R of the opening 2 of the container, which does not soften due to heat, Mlo is crimped along the shape of the rounded part of the opening 2, but! In the thermoplastic resin of the heat sealing layer 12 of E10, the opening of the container with the radius sinks into this resin layer.At this time, if the thickness of this resin layer is thinner than 6μ, the radius of the radius will sink. In the vicinity of the apex, most of the resin is removed, resulting in poor adhesion.If the thickness is 6μ or more, there is no particular problem, but from an economical point of view, it is preferably about 60μ. This thermoplastic resin layer does not necessarily have to be one layer, but may be composed of two or three layers.

Examples of such thermoplastic resins include polyolefin resins such as polypropylene, polyethylene, and EVA, BAA, ionomers, acid-modified polyolefin resins, polyesters, polystyrene, and acrylic resins.

More detailed examples will be described below.

Now, as shown in Fig. 3, a glass container body 1 is prepared, in which the width W of the opening 2 is 4fl, the shape is a continuous semicircle, and the radius of curvature r is 2. Water, salad oil, meat sauce, jam, and tomato juice were brushed on each to adhere. Then, the heat-resistant coating layer 15
A lid consisting of a single layer of ionomer 78μ thick aluminum foil/40μ thick EAA film 2
The outer periphery 3 of the opening was heat-sealed under the conditions of 30 t x 4 kg/aJ x 2 seconds.

In addition, a hermetically sealed container with the same lid heat-sealed was prepared as a comparative example without allowing anything to adhere to the opening.

When the peel strength of the former lid was measured, it was 1.5 kir/
15 Crane cloth ~2. 0kg/15mm width, the strength is almost the same as that of the comparative example, and there are no seal defects at all. f! It has been certified.

Furthermore, when I tried peeling off the lids by hand, I was able to open them easily.

〔effect〕

According to the present invention, as described above, the heat-sealed portion of the high-hardness container body is curved, and the lid is heat-sealed to that portion, so even if the opening is contaminated, the heat-sealed portion of the container body can be heat-sealed together with the lid. When pressure is applied, contaminants are pushed out from the pressurized part to both sides, so there is no seal failure, and even when the lid is peeled off by hand, as can be seen from the chain line in Figure 2, the adhesive surface Since the peeling force is close to 90° and only a small amount of peeling force is required, the package can be opened easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a sealed container showing an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 is a sectional view showing another embodiment. 1... Container body, 2... Opening, 3.
...outer edge, 10...lid, 11...
... Base material, 12 ... Heat seal 1PJFJ,
R...R section. Figure 1 Partial Figure 2 Figure 3 W [q3-

Claims (1)

[Claims] In a container that is sealed by heat-sealing a lid having a heat-sealing agent layer on the base material to the opening of a container body made of a highly hard material that does not soften due to the heat of heat-sealing, the opening of the container body has zero A radius of curvature of .5 to 10 mm is formed, and the heat sealing agent layer has a thickness of 6 μm.
A sealed packaging container characterized in that the lid made of the above thermoplastic resin is heat-sealed to the rounded portion.